Hello,
My aim is to build an offline ZVS halfbridge 750W smps with +/- 75 V output, fixed frequency (50-75 kHz), fixed duty cycle, unregulated and with only (a lot of) capacitance on the output rail and with a zenerclamp to drain anything more than 80V on both rails. It has to be a VERY simple circuit, so I can fool around a little with the basics and see how it behaves with different parameter-values. Eventually I want to use it for a ZAPpulse class d amp.
I use LTSpice for simulation, which is fun to work with and it is free. It's also specially designed for simulating high frequency switching circuits. Up till now I used basic signal source components to drive the mosfets, but, as I am approaching the stage of actually thinking of building the thing, I would like to do some simulations with a real controller, before I deep into transformer characteristics and -calculations.
Now I have two problems:
1. What controller should I use for this application? I googled a lot and found many controllers, but there's a lot of them and I cannot judge which one is the best.
2. How can I get the spice model for such a controller? Linear Technology does not seem to have the right controller, at least not in their library.
If anyone could give some advice, I would be very grateful.
TIA, JZ
PS: When I get to actually building it, I intend to use my 1000VA +/- 80V toroid as "mains" AC, first testmodel will use 1 secundary, giving 80V AC; next test will be 2 secondaries = 160V AC and finally, if all goes well and I understand the operation of the PS, I will, very cautiously, try real mains.
My aim is to build an offline ZVS halfbridge 750W smps with +/- 75 V output, fixed frequency (50-75 kHz), fixed duty cycle, unregulated and with only (a lot of) capacitance on the output rail and with a zenerclamp to drain anything more than 80V on both rails. It has to be a VERY simple circuit, so I can fool around a little with the basics and see how it behaves with different parameter-values. Eventually I want to use it for a ZAPpulse class d amp.
I use LTSpice for simulation, which is fun to work with and it is free. It's also specially designed for simulating high frequency switching circuits. Up till now I used basic signal source components to drive the mosfets, but, as I am approaching the stage of actually thinking of building the thing, I would like to do some simulations with a real controller, before I deep into transformer characteristics and -calculations.
Now I have two problems:
1. What controller should I use for this application? I googled a lot and found many controllers, but there's a lot of them and I cannot judge which one is the best.
2. How can I get the spice model for such a controller? Linear Technology does not seem to have the right controller, at least not in their library.
If anyone could give some advice, I would be very grateful.
TIA, JZ
PS: When I get to actually building it, I intend to use my 1000VA +/- 80V toroid as "mains" AC, first testmodel will use 1 secundary, giving 80V AC; next test will be 2 secondaries = 160V AC and finally, if all goes well and I understand the operation of the PS, I will, very cautiously, try real mains.
Did you look at the OnSemi QR Controllers? Many of the NCP Series have SPICE models which you may be able to adapt to the occasion.
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