Problems with PWM modulator simulation

[kees52]

I have a question about interleaved pwm modulator, how to get that nice three level signal on output, is it possible I use wrong comparator, I use the single supply version with dif voltages, it does swing +5 to -5 volts so it has to work. needs the comparator itselfs do need to have the same signal as on output, I do see it is on paper just 180 degree shifted like on picture who are the outputs of the two comparators independendly..

Thought simulating this just has to work normally. both signals are inverted.

thanks

 

[jan.didden]

Kees, this is a tread about use of LTspice.

I think you might get more help in a class D thread.

Jan

 

[kees52]

I do not now if I can put here, bu question is about simulation, in same way it do not work as I do presume.

I have some question about a simulation of a pwm modulator who has interleaved modulation, I do get the right signals, but the power stage do switch not as it suppose to, I get swings to the power rails and the fase shift do occur, no shoot throughs because of that and quite low distortions, but I need to have a signal as on pic three, maybe the models are wrong? #grizlek did made them for me, still thanks to him.

I have to say the frequency doubling do work, it shift 300 Khz carrier to 600 Khz suppressing the 300. It is in fact a very simple schematic, the feedback loops I am busy with.

the schematic is included.

regards