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Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
ScotchTapeLord wrote ...
I'm interested in reading up on this if you know anywhere with such info off the top of your head.
Just google for ZVZCS, ZCZVS, ZVZCT, ZCZVT and SAZZ. I really couldn't tell you which papers are actually good, although SAZZ seems state of the art for non isolated conversion if the efficiency numbers are to be believed.
Registered Member #3605
Joined: Wed Jan 12 2011, 04:46AM
Location:
Posts: 12
I have been messing with the ZVS driver in a java simulator and found the following...
Increasing the tank capacitor's ESR will expose the MOSFETs to a MUCH higher voltage than PI * input, and of course the sine wave is effected and output current decreases. Although worth mentioning, I did have to increase the ESR to a ridiculously high value to get a noticeable change though.
Scope Key: Top left = Tank Capacitor Top bottom = Top MOSFET Gate Middle top = Top MOSFET Middle bottom = Bottom MOSFET Right middle = Output Filter Capacitor Right most = Output load (1k Resistor)
(Change happens midway through graph)
When lowering the Main Inductor's value, the MOSFET's again receive much higher voltages than PI * input, the Tank Capacitor receives lots of ripple current with much higher voltage spikes than PI * input and the oscillation starts to become erratic with a not so pretty sine wave (after a point it's not even a sine wave anymore).
(Change happens midway through graph)
Note: I did not configure the transformer to step up to high voltage and the frequency is set low for simulation speed purposes.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
The transformer on this simulator is ideal. To have something that resembles actual operation you must add an inductor across the primary winding, with the total primary inductance. Better to use a true simulator, as the free LTSPICE.
Registered Member #3605
Joined: Wed Jan 12 2011, 04:46AM
Location:
Posts: 12
That wasn't my point, even with an ideal component it will not be so far off as to be incorrect. And this simulator is more visual than spice, which is another plus.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes, your waveforms are completely random and look nothing like any real ZVS would ever produce.
I tried running your simulation. I see that you did enter an inductance for the transformer, so it should work. Sometimes it works and gives the right waveforms, other times it doesn't. Your screenshot is from one of the times when it didn't.
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Zero Voltage Switching Converters
