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Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Every so often I try to get "CircuitMaker 2000" to simulate a ZVS driver circuit, and it never worked (i.e. it would never oscillate) until recently, when I split the resonator capacitor into two capacitors connected in series, and brought the DC power into the common point.
Although CircuitMaker predicts oscillation, it seems quite value-sensitive.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I've not used a circuit simulator for a long time so not certain but;
. CircuitMaker do not have a circuit simulator in their present suite ... why not ? . in real life your circuit will not work . add a switch for the battery and watch the simulated transients . a simulation is only as good as the model, often 'parasitic'/intrinsic virtual components have to be modelled to get a true simulation
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Hello Sulaiman, thanks for the reply.
I always take simulation results with a (big) grain of salt. In this case however I also happened to find a blog where someone mentioned this modified circuit...although when I read it again, it's not clear from the wording that it was actually tested.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
At least in a simulation, this circuit appears to really work. It is being powered through the 390 ohms resistors and the diodes. The choke can be omitted, as it is not doing anything, and a single capacitor across the primary coil can be used. Don't expect great efficiency.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
the few zvs that I have played with work best when gate resistor power is applied - oscillations can be seen on a 'scope, and now in simulation, then when power to the primary is applied you do not get the dreaded lock up condition.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Every time I try to set an initial condition, I get an error message that the time step is too small.
But I just got another idea. I'm going to try to use a "battery" to supply power to the gates, and a "signal generator" (set to produce a long positive "pulse" with a small initial delay) to supply power to the primary.
Edit: Finally, it seems to be...at least oscillating. The signal generator seems to be a work-around for the start up problem.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Oscillators in simulations have to be started, or they just continue in the DC operating point, calculated by the simulator at the start of the simulation. Add a pulsed voltage source in series with one of the capacitors, producing a brief pulse at the start of the simulation.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I'm not sure why your simulation works because looking at the circuit diagram I would not expect it to,
. Rload (100R) would betransformed to about 5 Ohms across the primary . from the simulation, the resonant frequency is 80 kHz 0.1 uF at 80 kHz has a reactance of about 20 Ohms ... much too large for a 5 Ohm load, try using Rload = 100 kOhm and for resonance at 80 kHz, 100 nF requires 40 uH to resonate with .... all looks odd to me.
For my curiosity, would you run the simulation again but show the voltage at one of the transistor drain terminals please ?
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Circuit Maker Simulation of Modified "Mazzilli" Driver
