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98 Threads found on edaboard.com: Zero Switching
hi, I need explanation of zero Voltage switching in Induction Heating devices. Is there any special circuit used to achieve ZVS? or it is achieved via coil and matching network design? Regards
Hi, There are ready to buy isolating solid state relays. Use one with zero cross acting. Klaus
hello I am in confusion about when to use the signal of current zero crossing and voltage zero crossing. I am sure that when I switch on a relay, it is best to fire it at voltage zero crossing, but regarding switching off the relay, should I switch off it at voltage zero crossing or current (...)
Do you mean that coil current should drop to zero before a new cycle begins? Find the proper point where you can monitor voltage (or current). Tap at that point, and it can serve as a feedback signal. This simple boost converter is a good example how to do that. It takes feedback from the node between inductor and switch. It applies it as a contro
What you probably want, is to measure each shunt at two timepoints, one where the result is "zero" (like, switch is off, right before next turnon) and then another where the voltage is significant and most stable (dead quiet in a switcher, ain't gonna happen - but pick the best, perhaps right before switch turnoff). There exist integrated shunt-a
Dear All, i am trying to simulate following circuit. When i switch on the MOSFET momentarily at zero crossing of the Iin, and measure voltage across the capacitor(C1), am i not supposed to get response resembling a square wave? I think momentarily switching the inductor at zero crossing of Iin, should flip the voltage across C1 and i (...)
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Hi, I was wondering whether switches in an inverter get rid of ringing completely by utilizing soft switching techniques. For instance suppose I have a full-bridge series-loaded resonant converter using Mosfet switches . Is it possible to eliminate ringing at the turn on and turn off instant by using zero voltage switching (ZVS) ? Does (...)
Hi, I was wondering whether switches in an inverter get rid of ringing completely by utilizing soft switching techniques. For instance suppose I have a full-bridge series-loaded resonant converter using Mosfet switches . Is it possible to eliminate ringing at the turn on and turn off instant by using zero voltage switching (ZVS) ? Does (...)
dear friends i m trying to implement 3pole 3 zero compensator for sinewave UPS i have transformer with leakage inductance of 31uH and output capacitor (AC) is 0.47uF i m not able to place the proper zeros due to very less switching frequency(17kHz) kindly help
hi, How zero-voltage and zero-current switching are achieved in resonant converters? what is the working principal?
This would appear to be fairly similar to your original proposition of 50/50% duty cycle at zero speed, switching diagonal pairs together. No. The original circuit was applying bipolar (two-level) pwm, 50 % anti-phase switching at zero speed. Other than unipolar (three-level) pwm, it involves a large ripple current with (...)
If this is 3GHz continuous / balanced (-ish) switching then it could be as simple as a blocking cap and a bias resistor network on the other side. zero delay and trivial loss are upsides, the need for some preamble period for the bias network to stabilize could be an application issue. Does it really need anything more elaborate, and if so, why?
If you have a DC supply for a motor being controlled by a SCR or thyristor then switching the device off would have no effect until the current through it falls to a low value (Ihold). This would occur naturally if the DC supply was unfiltered since the voltage would fall to zero between every half cycle. If you connected a second device across t
A better Bang for the Buck (intended pun) is to design a low voltage drop linear regulator after the buck SMPS which maintains the constant low voltage drop, while the linear regulator minimizes the ripple and has the benefit of current limit control down zero with wide BW ripple rejection and low step-load regulation error. In the old days Lambda
Hi, i'm designing and realizing on prototype board a full bridge class D amplifier. The switching losses of mosfets are higher than those provided by the calculations. The DC voltage is 250V and Fswitching=50KHz Pout=150Wrms. My question is: is there in literature a ZVS class d amplifier example? Is it possible to realize it? I
Generally one uses a "diode OR" function. Connect a diode from each source to the load. Whichever source is supplying a higher voltage turns on its diode and supplies the circuit. Any sources that are not active generally supply zero voltage. In your case set the AC supply to provide a little higher voltage than the battery, but both within the
how to make a ssr using triac to switch 5aurrent at 230v rating. please post any circuit diagram what is the term zero crossing detector in triac drivers such as moc3041 what is the use of it can i use moc3021 for switching application that is triggering triac please suggest some circuits regards kalyan
Hi all, Designed Flyback Topology based SMPS.Now want to convert SMPS in to zero Voltage switching Flyback SMPS. How to design ZVS Flyback Converter? Thanks & waiting For Knowledge Enhancement,:thinker: Sachin
The observed circuit behaviour looks expectable. The comparator threshold is zero without a hysteresis, so it will be switching with no input signal. I have a different problem with the circuit, I don't understand it's purpose. Why would we send the output of a comparator, amplified by another transistor stage to an ADC?