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Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
I want to make a high power resonant driver (1500 watts or so) for one of my HVHF transformers - mainly to be used as part of a capacitor charging power supply (CCPS) - and I'm trying to decide whether to go with a Mazzilli ZVS driver, or a half-bridge "series load resonant" (SLR) type driver, based on an SG3525, or something like that.
I am able to simulate the primary circuit of the SLR driver, using the antiquated spice software "CircuitMaker", but I cannot get the Mazzilli circuit to simulate with this software.
I'm wondering, has anyone successfully simulated a Mazzilli driver with any spice program? If so which software did you use?
What I would really like to know is, what are the usual failure modes of the Mazzilli circuit and what are the possible shortcomings it would have for use in a CCPS?
Registered Member #60260
Joined: Fri May 27 2016, 06:35PM
Location:
Posts: 14
LTspice is free and lets you simulate a Mazzilli ZVS driver.
If oscillation fails to start somehow, current is only limited by your pcbtrace resistance, your mosfet RDSon and your source, which usually means your mosfets die.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Oscillators are usually reluctant to start in a simulator, because unlike in real life, the balancing *is* perfect. You usually have to kick them into oscillation, by using 'initial conditions' on the capacitor, so that the simulation starts unbalanced. I'm not familiar with CircuitMaker, you should have initial conditions, but if not, then lightly couple a pulse generator into one side to kick it, or switch to LTSpice.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Thanks for the replies.
@ Molenaar: I played around a little bit with a cheap Mazzilli driver from ebay, and the first thing I discovered was that it wouldn't oscillate if the applied DC power ramped up slowly.
@ Dr. Slack: The use of initial conditions was the first thing I tried, but the thing still wouldn't simulate in CircuitMaker. I didn't think of the pulse generator idea however. I'll try that next.
Edit: I just tried LTspice and that didn't work either.
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Simulation of "Mazzilli Driver"
