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Well, when checking out other DRSSTC's I've found something which I think is quite odd In almost all the traces found online, there's a point when the IGBT starts turning off and then just stops doing that and goes back to the on stage I've attached a few photos to clear my point up a little.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
You know that the SSTC designs use current feedback from the tank right?
The whole point of having current transformers on the tank is to provide feedback, and this just looks to me like the tank current reached maximum safe current, and so the bridge stopped driving the tank, nothing unusual there.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
That is the point where the energy transfer 'flips'. In the first image, for the first 5 cycles the switches are being driven and are transferring energy from the DC buss into the resonator. At the 6th cycle the gate drive the switches is turned off, and the switches are 'freewheeling' (acting like a bridge rectifier) allowing the energy stored in the resonator to be returned into the DC buss. There is a 180 degree phase change in the phase of the current/voltage flowing between the resonator and the buss (corresponding to the flip from positive to negative power transfer) and this is what you see in the voltage waveform.
That is the point where the energy transfer 'flips'. In the first image, for the first 5 cycles the switches are being driven and are transferring energy from the DC buss into the resonator. At the 6th cycle the gate drive the switches is turned off, and the switches are 'freewheeling' (acting like a bridge rectifier) allowing the energy stored in the resonator to be returned into the DC buss. There is a 180 degree phase change in the phase of the current/voltage flowing between the resonator and the buss (corresponding to the flip from positive to negative power transfer) and this is what you see in the voltage waveform.
Registered Member #4074
Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335
The freewheeling just happens naturally. The gate drive turns off, and then the energy in the resonant tank "rings down." The current in the primary circuit flows back through the diodes in the bridge, 180 degrees out of phase compared to the driven waveform.
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Something weird about primary oscilloscope traces
