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New Delhi, Jul 24 (PTI) A special court today ordered to put six former officials of the Commonwealth Games (CWG) Organising Committee (OC) and two firms on trial for alleged irregularities in merchandising and retailing for the 2010 mega-sporting event.Special CBI Judge Arvind Kumar ordered framing of charges against the then OC members V K Verma, M Jaychandran, Surjit Lal, Ram Mohan, Group Captain K U K Reddy and Sangita Welingkar.The two firms to be put on trial are Premier Brands Pvt Ltd. and Compact Disc India Ltd., associated with sportswear merchandising and retailing during the CWG games held here.According to public prosecutor Vinay Kumar Ojha, the charges of criminal conspiracy, cheating, and violations of the Prevention of Corruption Act will be formally framed against the accused on August 16.The court said there was enough evidence against the accused to put them on trial. PTI UK RT
Kozhikode (Ker), Aug 23 (PTI) A delegation of 20 service attaches (FSAs) from friendly foreign countries arrivedtoday at the Indian Naval Academy (INA) at Ezhimala in Kannur district on a two-day official visit. They were received by the academys Principal Director (Training) Commodore Arjun Dev Nair. The visiting FSAs were formally briefed on INAs infrastructure progress and plans, training processes and training facilities, a release from the INA said. A conducted tour to academic faculties and laboratories, warship simulator, weapon training centre, sail training centre, firing Range, sports facilities, equitation training centre, cadets mess, cadets squadrons and aquaticscomplex was also held for the delegation, it said. The FSAs expressed interest in exploring possibilities for enhancing training cooperation with their respective countries and participation in the annual Admirals Cup Sailing Regatta. PTI KV SS
Virat Kohli was a modest man after a record breaking day both on a collective and personal note as India beat New Zealand by six wickets in Kanpur to win their seventh straight ODI series.Kohli on Sunday became the fastest man to reach to 9000 ODI runs and score 2000 runs across all the formats in 2017. The Indian captain, who also hit his 32nd ODI ton in the third and final ODI, said that personal goals are an added bonus as the main aim has always been to win the game and series.”My aim is for the team to win the game and the series, and if I personally do well then it’s an added bonus,” said the Indian captain.”These things are hard to ignore since we keep hearing these, but the aim is to always make the team win from any situation,” he added.CHAMPIONS #TeamIndia pic.twitter.com/PuE6U0F8wG- BCCI (@BCCI) October 29, 2017The Indian bowlers didn’t start on a good note as Bhuvneshwar Kumar was being hit left, right and centre by Colin Munro. Introducing Hardik Pandya also didn’t help the cause early in the innings. In the end however, inspiring bowling performances from Jasprit Bumrah and Yuzvendra Chahal sealed the victory for the Men-in-Blue. Talking about his strategy, Kohli said that he decided to let the bowlers be and he is happy that they stepped up and pulled it through.”I decided that I let the bowler do what he wants to do and that’s why I was calm. There was dew too, just glad the boys pulled through. To be fair to the bowlers, the wicket eased out nicely. The ball was coming onto the bat beautifully,” said the 28-year-old.advertisement”Our last 15 overs, the bowling slowed down, so we were probably 25 runs short. It was difficult to get our shots away. But glad the bowlers came out on top: it was like a knockout game for us and the boys showed their character,” he added.And that’s a wrap from Kanpur. #TeamIndia seal the 3-match ODI series 2-1 #INDvNZ pic.twitter.com/yA27kd9Cva- BCCI (@BCCI) October 29, 2017The right-hander also didn’t forget to congratulate the Black Caps for the fight they put up during the three-match series.”Credit to New Zealand. They challenged us in all three games, and forced us to play our best in every game. Credit to the skill and character they possess. Congratulations to them for playing that way,” said Kohli.India will next take on the Kiwis in the three-match T20I series starting on November 1 in Delhi.
PTI Sports Highlights at 5:30 PMPTI Sports Highlights at 5:30 PMNew Delhi, Dec 21 (PTI) The following are PTIs top/expected sports stories at 5:30 pm:STORIES IN THE PIPELINEBENGALURU – Report of ISL match between Bengaluru FC and Jamshedpur FC.THIRUVANANTHPURAM – National shooting Championship for rifle and pistol.STORIES ON THE WIRE:SPO-IND-PREVIEWFormidable India look to wrap up series against Sri LankaBy Amanpreet SinghIndore, Dec 21 (PTI) A dominant Indian team is expected to maintain its stranglehold on a miserable Sri Lanka and wrap up the three-match series when the two mismatched teams face off in the second Twenty20 International here tomorrow.SPO-IND-RAHUL (CORRECTED)Inspirational Dhoni is still a matchwinner for India: RahulBy Tapan MohantaCuttack, Dec 21 (PTI) There is no denying the fact that MS Dhoni is at the fag end of his career but opener K L Rahul said the former skipper is still a match-winner for India and continues to be an inspiration in the dressing room.SPO-SMITH-INTERVIEW (UPGRADING)Powerful SA pace attack will put India under pressure: SmithBy Bharat SharmaNew Delhi, Dec 21 (PTI) Former captain Graeme Smith feels South Africas “powerful” bowling attack will put the Indian batting line-up under serious pressure in the upcoming Test series, starting January 5 in Cape Town.SPO-YEAR-GOLF (CORRECTED)Shiv, Shubhankar make 2017 a year to remember for Indian golfBy Amit Kumar DasNew Delhi, Dec 21 (PTI) New stars emerged on the horizon in Shubhankar Sharma and Ajeetesh Sandhu even as familiar faces strengthened their stranglehold by picking up their own set of titles in a season of new highs for Indian golf.advertisementSPO-RANJI-SEMIS-VIDARBHA (UPGRADING)Sensational Gurbani takes Vidarbha to maiden Ranji finalKolkata, Dec 21 (PTI) Medium pacer Rajneesh Gurbanis sensational bowling guided Vidarbha to their maiden Ranji Trophy final after they stunned defending champions Karnataka by five runs in a thrilling semi-final, here today. PTI APA APA
Local boy Shikhar Dhawan admitted that there is pollution in the Delhi air and the Sri Lankans might be uncomfortable with situation but their main is to focus on cricket.This is the first time that someone from the Indian team has openly spoken about the pollution and said that the Sri Lankan cricketers’ discomforts might be genuine. He agreed to this when he was asked about Mohammed Shami’s condition, who left the field after vomiting on the fourth day of the third and final Test, after struggling with the high level of pollution in and around the ground. In the earlier press meets, India had claimed that the Sri Lankans were using delaying tactics and not focusing on cricket.”It is possible (that their discomfort is genuine). Now only they (Sri Lankans) know (if their concerns have been genuine). Maybe in Sri Lanka the pollution is not that high. There are more beaches in Sri Lanka. It’s natural that coastal areas won’t have so much air pollution. Of course, they may be feeling discomfort. And it is not as if there is no pollution. I won’t hide that. It is what it is. Maybe they are feeling it more, I don’t know.”We have so many players who are not from Delhi. But we as a group have a job on our hand. Of course there is high pollution in Delhi. But it is our responsibility to play and focus on cricket,” said Dhawan.”But I still insist playing is our farz and karm (he two words loosely translate to duty and deeds), which we should do. They must be feeling it (discomfort), though,” added the birthday boy, who turned 32 on Tuesday.advertisementWe are not letting the birthday boy @SDhawan25 escape today. ??? pic.twitter.com/OAtnIi203M- BCCI (@BCCI) December 5, 2017He also confirmed that Shami is fine and will play on the final day against Sri Lanka on Wednesday.Shami appeared to be struggling after bowling three overs. His reaction was similar to Sri Lankan seamers Suranga Lakmal and Lahiru Gamage.After throwing up, Shami walked off the ground after consultation with the physio amid concerns over poor air quality.With India reducing Sri Lanka to 3/31 at stumps after setting a target of 410 runs on the fourth day and with three sessions left in the game, Shami is vital to the team since Virat Kohli has only four specialist bowlers in the team.”Shami is fine. You will see him in action tomorrow,” Dhawan told the media after the end of play.In the morning session, Sri Lanka were bowled out for 373 in their first innings, conceding a lead of 163 runs to India. India declared their second innings at 246/5, setting a target of 410.Dhananjay De Silva (13 not out) and Angelo Mathews (0 not out) were at the crease when the umpires called it a day, with Sri Lanka 379 behind the target.”We will try our best to go for the win tomorrow. Pressure is on them,” Dhawan said.
BALTIMORE — Music blared from the purple bus, and Baltimore Ravens fan Racquel Bailey stood with drink in hand amid her usual tailgate buddies while making a bold fashion statement: a black, rhinestone-decorated jersey with the white No. 27.A Ray Rice jersey.“There’s two sides to every story,” said the 23-year-old waitress from Baltimore. “I saw the video. That’s their personal business, and it shouldn’t have affected his career. I don’t agree with domestic violence, but she’s still with him, so obviously it wasn’t that big of a deal. Everyone should just drop it.”Ravens fans male and female, young and old, arrived for the Sept. 11th game against the Pittsburgh Steelers debating the events that have affected their team over the last few days.Their once beloved running back has been kicked off the team and banned by the NFL after a video surfaced that showed him punching his then-fiancee — and now wife — inside an Atlantic City hotel elevator.All condemned Rice’s actions, but there was little consensus as to what his punishment should be. The NFL did the right thing by suspending him, some said, but the Ravens shouldn’t have terminated his contract as well. Or maybe the suspension should have remained at two games, where it stood before the punch video became public.Meanwhile, those who wore Rice jerseys were getting heckles and high-fives. “You support a wife-beater!” one female fan yelled at male fan wearing a No. 27 about 90 minutes before kickoff.Outside of at least one entrance, a memo explained the “Ray Rice Jersey Exchange” policy, aimed at “particularly families, women and children” who wish to exchange a Rice jersey for that of another Ravens player.The Ravens are no longer selling Rice jerseys, but at least one independent vendor had some Rice action figurines on sale next to his collection of vintage Baltimore Colts wares.The somber nature of the Rice saga jarred with the usual merriment surrounding a night game. The NFL Network set outside the stadium included panelists discussing serious issues on the air, while raucous fans hoping for a win over the Steelers cheered in the background.Paul Kilduff, 65, put two pieces of duct tape over the letters “Ray R” on the back of his faded shirt so that it read “Be Nice” instead of “Ray Rice.” But the tape kept falling off, so he took off the jersey, then put it back on without the tape while uttering, “Ah, I might as well.”“Everybody deserves a second chance,” he said, a refrain heard often in the parking lot.This, after all, is the franchise of Ray Lewis, who was charged in a murder case in 2000 but now has a statue outside the stadium. His No. 52 remains arguably the most visible jersey among tailgaters.But there were plenty of No. 27s, and many of them said they were deliberately making a statement.“I took the bus here, so people were, like, ‘Good, I’m glad to see to someone out here showing support,’” said Gage Friend, 18, as he learned against the barrier by the players’ entrance.“But I’ve also seen a lot of people giving me dirty looks and people saying stuff to me like, ‘I can’t believe you’d wear that. Don’t you know what he did?’“Yeah, I’m pretty aware of what he did. And, yes, it was awful and it was definitely a mistake on his part, but he deserves a second chance. … People have done so much worse in this league.”Others supported the team’s decision to get rid of Rice, including one who called out Ravens owner Steve Bisciotti for not acting sooner.“He’s a coward,” said Stephanie Wright, 43, from Shrewsbury, Pa. “He was just scared of public opinion so that’s why he just terminated (Rice). … You should be held accountable. If he was a policeman or a firefighter, he would have lost his job immediately.”___By Joseph White, AP Sports Writer. AP writer Juliet Linderman, AP Pro Football Writer Rob Maaddi, AP Sports Writer Jon Krawczynski and AP freelance writer Pete Kerzel contributed to this report.TweetPinShare0 Shares
NEW YORK — Eric Staal hardly had a storybook debut with the New York Rangers: no goals and not a lot of big plays.The 31-year-old forward had to settle for a win, courtesy of Derek Stepan and Antti Raanta.Stepan’s short-handed goal snapped a tie with 2:48 to play and Raanta preserved the win with a last-second save to lead the Rangers to a 2-1 victory over the Columbus Blue Jackets on Feb. 29.“It’s been a lot of fun coming here and joining this group,” said Staal, who has not been on a playoff team since 2009. “It’s a great group of guys that made me feel real welcome right off the bat. It feels real nice to get the win — that’s what we’re focused on here as a group.”Staal, acquired in a trade with Carolina on Feb. 28, had one shot on goal and his failure to get the puck out of his zone in the waning seconds forced Raanta to make a crucial stop.“Everybody saw the size and puck protection capabilities as he gets more comfortable with the group,” Rangers coach Alain Vigneault said.“Every time you add a new piece, you change the dynamics of the group. You got a guy here who comes in and was a captain. He is going to help our leadership group, and we just need to give him a little bit of time to get used to the environment.”Mats Zuccarello also scored and Raanta made 26 saves in giving the Rangers their 13th win in 18 games (13-4-1).Henrik Lundqvist’s backup denied Cam Atkinson on the doorstep with less than a second remaining to preserve the victory.Atkinson scored his 20th goal of the season and Joonas Korpisalo had 22 saves for Columbus, which finished 7-3-3 in February.Stepan gave the Rangers the lead on a partial breakaway while Eric’s brother, Marc Staal, was in the penalty box.Raanta made it stand up with a pad save on Atkinson just before the final horn. Columbus defenseman Ryan Murray put in the rebound but it came after time ran out.Raanta wasn’t sure whether the goal counted, but his teammates quickly told him it was late.“I thought it was in,” Murray said. “I didn’t hear the horn. The adrenaline was going I guess, but I didn’t hear it.”Eric Staal was the initial focus of this game, after being obtained for prospect Aleksi Saarela and two second-round draft picks.The Rangers hope Eric Staal will provide scoring for another Stanley Cup run, and he was cheered almost every time he touched the puck in the early going.He started out centering the third line, played left wing on the first line in the third period and finished with almost 16 minutes of ice time.He had one outstanding scoring chance, a second-period shot from the left circle that Korpisalo hugged to his chest.While Staal had the attention of the Madison Square Garden crowd, the game turned out to be a tight-checking affair in which the goalies were the best players, although Stepan and Rangers captain Ryan McDonagh made the biggest play in the game.After the Rangers totally shut down a Blue Jackets power play, McDonagh chopped the puck out of his zone and Stepan collected it at the Columbus blue line.He skated in on Korpisalo, gave him a pump-fake with his leg and then cut across the crease to put the puck in an open net.“It was a great play by Mac,” Stepan said. “I am able to jump up in a situation where it’s just me and the goaltender. Originally I was going to shoot it. I took a look up and took my chances trying to beat him to the back pipe.”Raanta nursed a 1-0 lead into the third period until Rangers defenseman Dan Girardi made a horrible cross-ice pass at the point that Atkinson intercepted, giving him a clear run at the net.Raanta stopped the initial shot but Atkinson slammed home the rebound to tie it.Minutes later, Korpisalo denied Kevin Hayes on a breakaway.“I thought we did a lot of good things,” said Columbus coach John Tortorella, the Rangers’ bench boss before Vigneault. “I thought we defended well. Again, neither team got too many scoring chances, but they found a way to win.”The Blue Jackets outshot the Rangers 13-8 in the first period and had the better of play, but they trailed 1-0 thanks to Zuccarello.Playing what was an extended shift, he took a pass from Dan Boyle, circled the net and banked in a shot off the skate of Blue Jackets defenseman Dalton Prout for his 21st goal of the season.(TOM CANAVAN, AP Sports Writer) TweetPinShare0 Shares
TORONTO — Cleveland’s perfect playoff run went south in the north.DeMar DeRozan scored 32 points, Bismack Biyombo set a Toronto playoff record with 26 rebounds and the Raptors beat Cleveland 99-84 in Game 3 of the Eastern Conference Finals on May 21, handing the Cavaliers their first loss this postseason.Kyle Lowry scored 20 points, Cory Joseph added 14, and Patrick Patterson and DeMarre Carroll each had 10 for the Raptors. They rebounded after losing the first two games in Cleveland by a combined 50 points.In Toronto, where “We The North” is a rallying cry, a sell-out crowd dressed in red and white T-shirts cheered the Raptors to their seventh victory in nine home playoff games. Game 4 is May 23 at Air Canada Centre.“It’s a long series,” Raptors coach Dwane Casey said. “It’s not over with yet, but everybody thought we were going to get swept. I think that fuels us and if that’s what it takes, so be it.”LeBron James scored 24 points, and J.R. Smith had 22 for the Cavaliers. They won their first 10 playoff games and were trying to match the Los Angeles Lakers’ record of 11 straight victories to begin a postseason. The Lakers did it in 1989 and again in 2001.“We didn’t play our game and they made us pay for it,” James said. “We didn’t start the game as physical as we should have at the point of attack.”Biyombo had four blocks, helping Toronto limit the Cavaliers to 20 points in the paint. The Cavs had 106 points in the paint in the first two games.“It was amazing, honestly,” DeRozan said about Biyombo’s performance. “He was big time tonight. Without him, we probably wouldn’t get this win.”Kyrie Irving scored 13 points, and Channing Frye had 11 for Cleveland. The Cavaliers were held below 100 points for the first time in these playoffs.“They came out and they beat us,” Cleveland coach Tyronn Lue said. “They were more aggressive. They were more physical. They were more active. They were faster. They beat us to the ball.”James had five assists, moving past Jason Kidd and into third place on the NBA’s career playoff list.It was a rough night for Cavaliers forward Kevin Love, who scored three points and made just one of nine field goal attempts. Irving also struggled with his shooting, missing 16-of- 19.“Those guys will be better,” James pledged.Irving checked out at 1:38 of the fourth quarter and had to be helped to the locker room following a collision with Joseph.“I just got the wind knocked out of me,” Irving said.With his team ahead by eight, Biyombo scored six straight points in the fourth to put the Raptors up 91-77 at 3:38.“He was huge,” Casey said. “I thought he played a big-time game in the paint.”DeRozan scored 12 points in the first but saw a buzzer-beating 3 waved off after video review.Lowry scored eight points despite picking up his second four at 5:40 as Toronto led 30-24 after one. It was the first time in nine quarters this series that the Raptors had outscored the Cavaliers.Carroll, Joseph and Patterson each made 3-pointers during a 16-2 Toronto run midway through the second as the Raptors overcame Lowry’s third foul to take a 54-37 lead.James went down clutching his face after being accidentally elbowed by Thompson during a scuffle at center court late in the second.Thompson and Joseph were given technicals on the play. James recovered to make a 3 in the final seconds, but Cleveland trailed 60-47 at halftime.“Our second quarter lineup didn’t do a great job of paying attention to detail,” James said. “They were able to bust the game open.”(IAN HARRISON) TweetPinShare0 Shares
ATHENS (AP) — Second-half headers by Dimitris Pelkas and Mauricio led Greek league leader PAOK over newcomer Lamia 2-0 on Saturday.PAOK is five points ahead of AEK, which hosts Xanthi on Sunday, and nine ahead of defending champion Olympiakos, which plays Panionios at home, also on Sunday.Lamia is in 13th place.Olympiakos is appealing sanctions for fan behavior that will cost it, if upheld, a three-point deduction and two home games in front of empty stands.Pelkas scored in the 56th minute, assisted by Diego Biseswar, and Mauricio added his six minutes later from point-blank range following a defensive mistake.Also, Kerkyra beat Apollon 2-0, and Atromitos won at Asteras 1-0 with a second-half injury-time goal.TweetPinShare0 Shares
NYON, Switzerland (AP) — Olympiakos was fined 90,000 euros for fan disorder at a Europa League home game against AC Milan last month. The Greek club risks a one-game stadium closure for a repeat offense in the next two years.After clashes between fans and Rome police at a Europa League game last month, UEFA also fined Eintracht Frankfurt 80,000 euros.Bayern Munich forward Thomas Mueller has been banned from both games against Liverpool in the Champions League round of 16.UEFA’s disciplinary panel imposed a two-game ban on Friday for Mueller’s red card after a bad tackle against Ajax last month.The panel added one more game to the mandatory one-match ban for a straight red card.Bayern plays at Liverpool on Feb. 19 and hosts the second leg on March 13 in a clash of five-time European champions.Ajax’s Maximilian Woeber also misses the round of 16 games — against Real Madrid — for his red card in a separate incident during his team’s 3-3 draw with Bayern in the final group-stage game.UEFA also fined Ajax 20,000 euros ($23,000) and Bayern 8,000 euros ($9,200) for separate incidents involving fans.In other rulings, Paris Saint-Germain was fined 35,000 euros for a range of charges, including crowd disturbances and “improper conduct of officials” at a 6-1 win over Red Star Belgrade in October.Red Star must pay 25,000 euros for “illicit chants” by its fans, who attended the game at Parc des Princes despite a UEFA ban on the club selling tickets to traveling fans.UEFA also threatened Eintracht with a one-game ban on selling tickets to an away game in the Champions League or Europa League in the next two years.Lazio was not sanctioned despite photographs circulating of a group of its fans appearing to make Nazi salutes at the Olympic Stadium.TweetPinShare0 Shares
NEW YORK (AP) — Giannis Antetokounmpo and Paul George have a chance to be both the NBA’s MVP and its Defensive Player of the Year.Reigning MVP James Harden is the other finalist for the league’s top award. The NBA announced three finalists for six individual award categories Friday, based on voting results from a panel of sportswriters and broadcasters.Antetokounmpo led Milwaukee to the best record in the league and a berth in the Eastern Conference finals. Oklahoma City was eliminated in the first round as George struggled with a shoulder injury that eventually required surgery.The other finalist for the league’s top defensive award was Utah’s Rudy Gobert, who won the award last year.The winners will be announced June 24 during the NBA Awards, when LeBron James will finish outside the top three of the MVP voting for just the second time in the past 11 years.The other award finalists:Rookie of the Year: Deandre Ayton, Phoenix; Luka Doncic, Dallas; Trae Young, Atlanta.Sixth Man Award: Montrezl Harrell and Lou Williams, Clippers; Domantas Sabonis, Indiana.Coach of the Year: Mike Budenholzer, Milwaukee; Michael Malone, Denver; Doc Rivers, Clippers.Most Improved Player: De’Aaron Fox, Sacramento; D’Angelo Russell, Brooklyn; Pascal Siakam, TorontoTweetPinShare0 Shares
“http://www.forskolinfuel-reviews.com/n” “Thanks Aubrey for another informative article.nnAmellamartin, slimming products on embedded.com, really…?” Justin584 says: “I really thank you for the valuable info on this great subject and look forward to more great posts. Thanks a lot for enjoying this beauty article with me. I am appreciating it very much! Looking forward to another great article. Good luck to the author! “I don t have the time at the moment to fully read your site but I have bookmarked it and also add your RSS feeds. I will be back in a day or two. thanks for a great site.t http://www.kingessay.co.uk/economics-essay/“ 7 thoughts on “Back EMF and snubber” “I have just come across a different approach to this topic. It is from a Maxim app note #6307nn”Switching Inductive Loads with Safe Demagnetization” which you can find atnnhttps://www.maximintegrated.com/en/app-notes/index.mvp/id/6307″ November 27, 2016 at 6:03 am July 22, 2017 at 6:10 pm November 30, 2016 at 3:26 pm Log in to Reply Leave a Reply Cancel reply You must Register or Login to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed. Electrical engineering students are taught about magnetics and that energy is stored in an inductor when it is energized. This can be presented in a theoretical sense and may be applied to topics like switch mode power supplies. What does not get a great deal of attention is the fact that there are inductors embedded in many devices and that the rules of energy and energy dissipation still apply there. The real world is bristling with relays and it is quite likely that the nascent engineer will be faced with activating some. Success! It turned on just fine, but wait a minute… when it turned off the micro went nuts. What happened?Well the relay, like the solenoid, the contactor, the motor, and who knows what else are inductors (aka coils) and they store energy when energized. But what happens to that energy when the coil is de-energized? The coil produces a back EMF (electromotive force) that is given by V= -L(di/dt). First of all, note that it is negative and secondly early in the process dt is small, so V will be a large number. Translated this means that you get a voltage spike at the coil terminal that is being driven by the electronics. Two things can happen: The voltage may be high enough to damage or destroy the electronic driver; and the spike may radiate and upset the operation of the micro (and other electronics) running in the vicinity. In extreme circumstances it may even cause a hard fault. It may also generate enough emissions to cause an RF emissions certification problem.Since getting rid of all the inductors is not possible, we have to suppress this back EMF. The most common technique with DC switching is to use a diode in parallel with the relay coil (aka freewheeling diode) as shown in Figure 1a. When the load is energized the diode is back biased and has no effect. When the load is de-energized, the diode becomes forward biased. The stored energy is dissipated back through the coil and the voltage at the driver is clamped to 0.7V above the relay supply voltage. The diode should be suitably specified based on the following. It must have a PIV (peak inverse voltage) equal to the supply voltage. The current through the coil cannot change instantaneously so that the current flowing through the coil when activated is shunted through the diode on de-activation and then decays, so the current flowing through the coil is the maximum current expected to pass through the diode. The freewheeling diode technique is so common that you can buy relays with the diode embedded (did you ever wonder why the pins to a coil were polarised?), or semiconductor drivers like the ULN2803 that have the diode integrated onto the silicon.However the freewheeling diode is not a panacea. In some cases, depending on the load, the flow of current in the reverse direction may keep the coil activated until the energy has sufficiently dissipated. Let’s assume that the solenoid was controlling a turnstile. Access to the turnstile release may be delayed for a several hundred milliseconds and when that happens at my gym it is quite irritating when you bump into that locked gate. I have seen the diode replaced with MOV (Metal Oxide Varistor) or a bipolar TVS (Transient Voltage Suppressor) but I am not fond of that since both types of devices seem to age over multiple breakdowns and finally stop working. In the case of the MOV it shorts across its leads when the back EMF exceeds its breakdown voltage, so it is no better than the diode. The TVS keeps a fixed voltage on breakdown and the time the current flows for is reduced.It is also possible that the freewheeling diode can damage the relay. The app note “Coil Suppression Can Reduce Relay Life” from TE says that a diode and zener in series work better than the diode alone.I have also seen MOVs, TVSs and fast Zener diodes used in the configuration shown in Figure 1b. My reservations on the aging of the types of devices hold here as well. Figure 1. Different Back EMF suppression techniques for DC. (Source: Author) Until now this was all about DC powered coils. What about AC? Well, there is a technique that works for both AC and DC and it basically involves connecting a resistor and capacitor across the inductor as shown in Figure 2a. This combination is known as a “snubber”. It is not unusual to find a snubber connected across the energizing switch as in Figure 2b. This has the advantage that it reduces arcing across the switch and since it is more likely to be on a PCB, it is easy to add the resistor and capacitor to the layout. In some cases with long wires it may be necessary to use both circuits.However there is one drawback with the snubber across the switch – whenever there is a capacitor there is an AC path. Aside from the fact that there is a voltage that may surprise the unsuspecting engineer or service technician, there will be a leakage current across the switch and in some cases it may even activate the load. One counter-measure is to add a bleed resistor or capacitor across the load to sink the leakage.Figure 2. Snubber connections to suppress back EMF. (Source: Author) When the coil is de-energized, the circuit is in a damped LCR configuration. Since the coil and capacitor are reactive, most of the energy is dissipated as heat across the resistor. In the real world there will be some heat generated in all the components. But of course this begs the question: what values do you use? In the field you will find that panel makers and other proponents of the industry have rules of thumb and will stick to those values, no matter what different experts say. (These are the suspiciously convenient 120R and 0.1uF.) Given that there are so many variables it may be impractical to design for every specific case. In researching this topic, I found that there is even a book on the topic “Snubber Circuits for Power Electronics” by Rudy Severns although I suspect it is aimed more at the switch-mode power supply designer. However the best guide to value calculations I found is an Application Guide for Snubber Capacitors from Cornell Dubilier.You can of course take a short cut and simply purchase commercially available coil suppressors, but in all events don’t give yourself an unpleasant surprise next time you try to control something in the real world. Plan for back EMF!Additional References: ameliamartin says: November 30, 2016 at 12:19 pm antedeluvian says: Log in to Reply “@ManyosinnThanks. nnAs far as AmellaMartin is concerned- it seems he/she/it posted the message elsewhere on embedded.com as well. Much as I dislike this at least I understand why when there is a commercial objective. nnHave you seen the inane and Embedded Systems Design using the Rabbit 3000 Microprocessor: Interfacing, Networking, and Application Development by Kamal Hyder and Bob Perrin. antedeluvian says: Share this:TwitterFacebookLinkedInMoreRedditTumblrPinterestWhatsAppSkypePocketTelegram Tags: Design Methods, Electromechanical Log in to Reply ameliamartin says: March 15, 2017 at 1:47 pm pawanpatidar198 says: Log in to Reply “I am certain there are millions of more pleasant intance ahead for individuals who discover your blog. http://www.totalbollywood.com/kiara-advani/“ The application of relay coil suppression with DC relays: Application Note from TE Relay products. Log in to Reply Log in to Reply Manyosi says: July 30, 2017 at 12:13 pm Log in to Reply November 27, 2016 at 6:04 am Continue Reading Previous NASA’s Alice Bowman to give keynote at ESC Silicon ValleyNext The end of the smartphone era: What will be the technology battlegrounds of the next decade?
Continue Reading Previous PragmaDev gives away ETSI SIP conformance test executablesNext Infineon: striving for autonomous driving development ON Semiconductor has announced a complete wireless battery free sensing solution kit (SPSDEVK1) that allows the company’s innovative Smart Passive Sensors to be rapidly integrated into Internet-of-Things applications. The SPSDEVK1 solution kit is plug and play ready for users to immediately measure, aggregate and analyze the data for various IoT applications.SPS wireless and battery-free sensors enable the monitoring of various parameters such as temperature, pressure, moisture or proximity at the network edge where running wires or replacing batteries may be impractical. When interrogated by an RF reader (the ON Semiconductor TagReader), the SPS “harvests” energy from the measuring signal, and then delivers a rapid and highly accurate reading from the sensor. This cost-effective solution has significant benefits over other technologies, and offers the potential to revolutionise low-power IoT sensing designs.The newly announced SPSDEVK1 is a complete sensing solution that includes a UHF SPS reader hub (SPSDEVR1-8), eight UHF antennas (SPS1DEVA1-W), 50 temperature sensors (SPS1T001PCB), a 12 V DC power supply, and an Ethernet cable. Also included is ON Semiconductor’s TagReader software, an application specifically developed for reading SPS that enables the full functionality of the tags, giving a comprehensive system solution.The TagReader software automatically detects the type of tag that is connected and reads sensor data graphically over time. A Graphical User Interface allows all system parameters related to the measurement process to be configured and re-configured as needed. As a result, with the SPSDEVK1, even first-time users can quickly and easily configure a system to measure, aggregate and analyse data for multiple fully wireless, battery-free IoT applications.Share this:TwitterFacebookLinkedInMoreRedditTumblrPinterestWhatsAppSkypePocketTelegram Tags: Tools & Software
Everyone needs a pair of earphones for gym. Spending an hour or so on treadmill or lifting weights can be a bit tedious. Music helps people going, it can help one jog that extra mile. The problem, however, is that finding a right pair of earphones for use in gym can be tricky. The earphones have to be sturdy and durable, must fit comfortably and securely. And need to sound good. Obviously! In other words, the earphones have to do everything right, and they must not be obscenely expensive.Sennheiser believes that its CX Sport In-ear offer everything that people want in a pair of earphones that they can carry to a gym. And it also believes that the Rs 9,999 price tag attached to these earphones is affordable enough (I disagree, Sennheiser but more about that later).Overall though, I believe the CX Sport is a darn good product. I particularly like how lightweight these earphones are and how well they pump out bass — Harder Better Faster Stronger — something that surely helps while you are trying to go that extra mile.Overall though I believe the CX Sport is a darn good productSo far, so so good. But, like all good things that come with a flaw (or flaws), so does the CX Sport In-ear wireless earphones. I wish they were slightly better designed and delivered some more hours of battery backup. And then there is limited colour: only available in fluorescent yellow colour. Some people will love it, most — like me — won’t. Also, the light colour means it tends to show dirt and grime quite frequently, especially if you are doing your jogging sessions outdoors.advertisementDesign and build qualityLooks matter. Even if most of the time people around you will be too busy huffing and puffing on the treadmill or will be focussing on lifting weights to see what sort of earphones you are wearing. I don’t mind wearing the CX Sport at the gym, even if I don’t like its colour. But I wish they had a bit more style, so I could wear them while travelling or while working — and not working out — in office.It’s not that the CX Sport is a bad looking product. But it is bland. The wire has a thick rubber sleeve — very durable but surely as boring as it can get. The earpieces too are coated in rubber. I understand that rubber is a requirement for gym focused earphones, but maybe the design and shape of the earpieces could have been more attractive. I also don’t like the winglets. They too look out of the place, although they are supposed to help in keeping the earphones securely fasten when you are exercising. Talking about the fit, the CX Sport fits well enough and they are light enough for you to carry them around your neck. The only time there’s some issue is when you are running at a steady pace. The earbuds tend to fall out of ears when you bend sideways during stretching. I wish this could have been better, although this is something that may not be a problem for all given how each one of us have different ears sizes.The build quality is very good. In my two weeks of using the headphones, I often used them without any care. I would throw them into my bag with keys and coins, and I used them while exercising. The CX Sport is sweat and splash resistant, so you can definitely clean them with a damp cloth. But it is important to note that Sennheiser hasn’t specified the IP rating of the headphones, so don’t go swimming or take a shower while wearing them.Setup and using itThe CX Sport In-ear Wireless headphones are extremely easy-to-use. On the right side of the neckband there are buttons to control volume, and they within reach easy reach. The length of the neckband is neither short nor long, it is just right.Sennheiser believes that its CX Sport In-ear offer everything that people want in a pair of earphones that they can carry in a gymSetting up the CX Sport In-ear wireless headphones is also extremely easy. There’s no rocket science about it. The good bit is that the CX Sport In-ear wireless headphones can be connected to two devices at a time – be it two phones or one phone and one laptop, depending on the requirement. To set up the CX Sport In-ear wireless headphones with PC/phone, the process is the same:advertisement–Switch on the Bluetooth of your phone or laptop–Switch on the headphone by log pressing the power button–Pair both the devices by going to the setting on your phone or laptop–The CX Sport In-ear wireless headphones will instruct you that the devices are connectedThe CX Sport comes with Bluetooth 4.2 support, which means the headphones come with a decent frequency range of almost 10 metres or slightly more than that.PerformanceSennheiser is a well known audio gear manufacturer. And over the years, it has mastered the sound that comes out of headphones, mostly. The CX Sport delivers sound that will please your ears. But given that these are the earphones are mostly for the gym goers, there is an emphasis on the bass or low and mid frequencies. Think 8 Miles from Eminem, that is the kind of song that the CX Sport make sound sublime and rich.And because the emphasis on lows and mids, the highs and treble aren’t that good. They become too shrill at higher volume. I tested the Sennheiser CX Sport In-ear wireless earphones for over two weeks, and overall I loved the sound coming out of these earphones. I listened to almost all music genres — EDM, jazz, and Bollywood, and was pleased to see that in almost all songs and soundtracks, the CX Sport turned out to be impressive.But the CX Sport particularly excels at EDM songs like songs like Lean On by DJ Snake and pop songs like Closer by Chainsmokers. Similar is the performance in Bollywood songs. On occasions, even classicals like the Tagore’s Tabu Mone Rekho and Ore Grihobashi also sound perfect. At the same time, due to slightly weaker highs and good lows, the soundstage too is limited. This is the reason why I realised that in songs like the Shiva Tandav Stotram, which is trance but also a piece where there is a lot that is going on, it is difficult to distinguish between all the instrument sounds when you listen to it on the CX Sport.In comparison, the Momentum Free (review), another pair of earphones from Sennheiser deal with such songs in a more delectable manner. The issues with the high-pitched sounds also mean that the CX Sport make a mess of songs like Animals by Maroon 5, where the vocals sound muddy. Lowering volume helps but not entirely.The CX Sport doesn’t come with active noise cancelling support, but because it’s an in-ear headphones and the buds go pretty deep inside the ears, the ambient noise is blocked well. Another good bit about the CX Sport is the call quality. It’s smooth, loud and clear. In fact, the CX Sport is better here than the Momentum In-ear, which is a much more expensive product. The CX Sport also comes with Qualcomm Apt-X support.Battery performanceThe CX Sport In-ear Wireless headphones come with a built-in rechargeable Lithium-ion Polymer battery. The battery backup of the Sennheiser CX Sport Wireless headphones could have been better. In my two weeks of usage, the maximum that the headphones lasted was for 5 hours on single charge, which compared to other headphones at this price tag is on the lower side. The good bit, however, is that the headphones don’t take much time to get fully charged, about 90 minutes.advertisement Just like the Momentum Free earphones, the CX Sport also comes with the feature that allows it to inform users about the battery status.Should you buy it?Yes.The CX Sport In-ear Wireless headphones deliver more or less fantastic sounds — some niggles are there but those are just that: niggles — and are extremely easy and light to carry around the neck. You can wear them easily for the entire day. And if you like EDM and hip-hop while working out — everyone likes these songs while working out — you will absolutely love the sound of the CX Sport. I did!It’s just that I wish the CX Sport could have come in a different colour. I find the shade of yellow that it has ugly, but then our choices with colours are subjective so don’t let my choice hold you back from taking a look at the CX Sport. I also find the CX Sport a little pricey, especially if you are going to use these earphones only in the gym. It would have been better if the price would have been lower by Rs 1,000 or Rs 2,000. But if you don’t mind spending Rs 9,999 on a pair of wireless earphones for gym, go for the CX Sport.Sennheiser CX Sport review 8/10Good stuffGood with EDMLightweightBuild qualityBad stuffBoring designSoundstageThat ugly colour
New Delhi, July 20 (PTI) It is his dream to ensure that talented Indian boys get state-of-the-art training facilities and Sachin Tendulkar today said that the Tendulkar Middlesex Global Academy (TMGA) is a giant step towards realising that. “Without doubt talented boys will get an opportunity to travel to England and train at the Middlesex Academy. There will be focus on the children coming from the less privileged society. We will try to provide them every assistance that they couldn’t afford,” Tendulkar told PTI. It is learnt that 100 percent scholarship will be provided to the talented cricketers. The TMGA is planning to have its centres across various countries including one in Tendulkar’s home city Mumbai. Asked what made him prefer the London-based county for a tie-up, Tendulkar said: “Whenever I have been in the UK during my playing days, I have trained a lot at the Middlesex Academy (headquartered at the Lord’s). So I had a fair idea about how they function. They came up with the idea last year.” While the focus will be on cricket, but Tendulkar wants the global academy to built a robust “club structure”, which will enable the young boys and girls to take up one sport even if not at professional level. “I want to build a solid club culture and that’s why the academy will have tennis, badminton, squash courts along with swimming pool. As I have maintained, it’s time we become a sport playing nation from a sport loving one,” the legend said.advertisement The camp for the Mumbai academy is expected to be conducted in November, once the monsoon season is over. “When we decided to launch the academy, we wanted to start off with Mumbai but due to monsoon, we are planning to have the camp in November,” Tendulkar said. PTI KHS AHAH
Jakarta, Aug 5 (AFP) Indonesian president Joko Widodo led some 65,000 of his compatriots in a mass dance through the streets of Jakarta today to promote the Asian Games and try to set a world record along the way.Jakarta and the city of Palembang on Sumatra will jointly host Asia’s biggest sporting event from August 18 but President Widodo has previously complained about the lack of promotion and enthusiasm in the country.In a bid to drum up support ahead of the games authorities turned to the poco-poco, a traditional line dance from North Sulawesi province.Dressed in white and red – the colour of the Indonesian flag – President Widodo, his wife Iriana, and several high ranking officials led tens of thousands of Indonesians in a long, snaking line of dancers through the capital.Organisers hope to break the world record for the largest number of people performing the traditional dance in one place and said 65,000 people took part in Jakarta.”Poco-poco is the original culture of Indonesia and it’s a native dance, so we are now performing a mass Poco-poco dance with 65,000 people setting the world record showing and reiterating Poco-poco belongs to Indonesia,” police chief Tito Karnavian who took part in the event said.Police and military staff, members of parliament, students, members of fitness centres as well as inmates in jails across Indonesia all showed their best Poco-poco moves at the same.”This a very good opportunity to show that Indonesia is conserving its traditions,” high school student Raja Farid Akbar said. “I am happy that I can help promote a tradition that could have been forgotten.”advertisement About 11,000 athletes and 5,000 officials from 45 Asian countries are expected to flock to Jakarta and Palembang for the August 18 to September 2 Games, the world’s biggest multi-sport event behind the Olympics. (AFP) MRJMRJ
England vice-captain Jos Buttler wants his team to be more clinical against Virat Kohli and his team as they look to extend their lead over India in the second Test at Lord’s starting today.Virat Kohli scored his maiden Test hundred in the first Test at Edgbaston. However, the batsman was dropped twice before he brought up his century and Buttler is happy that England bowlers made it difficult for Kohli to score runs.”It was a brilliant hundred from Kohli in the first innings, but you have to give the bowlers credit too. He really had to battle for all of his runs, and we created some chances which weren’t taken. That’s something for us to work on this week, trying to be more clinical,” Buttler wrote on Sky Sports.The hosts lead 1-0 in the five-match series following their 31-run victory in Birmingham.”Even though we won at Edgbaston, there are definitely some areas for us to work on. We were 216-3 in the first innings, with Root and Jonny Bairstow going very well, and we didn’t capitalise on that. And then, bowling, we had India 100-5, but allowed them to get up close to our score.India vs England: Virat Kohli wants composure from his batsmen at Lord’s”They are a couple of areas we need to brush up on while, individually, I had a very quiet game, so I’m looking to contribute a lot more.I still feel in a good place. I’ve been in the form of my life this summer, so I’m trying not to let one poor game to affect that. I’ll work hard in the nets this week, and I look forward to what is always a special occasion playing at Lord’s.”advertisementBatting dilemma, strategical changes in line for India ahead of Lord’s TestAll-rounder Ben Stokes, who played an influential role in the Edgbaston win, is not a part of the Lord’s Test and Buttler said it is going to be a “massive miss”.”Stokes is going to be a massive miss at Lord’s, but we knew he wasn’t going to be involved. And, any time he isn’t in the side, it gives the chance to others to try and fill his shoes, just as Sam Curran did at Edgbaston. He has an incredibly bright future ahead of him.(With PTI inputs)