I'm designing a heating coil and tank capacitor system that is power with a half bridge inverter from a 48 volt battery. In order to verify the theory of the circuit, I wanted to throw an ideal version of the system in LTSpice but I'm getting some strange results. I'm seeing the voltage of the load swing from 12mV to -12mV where I would expect the amplitude to be from -24V to 24V. The PWM signal are set to 100kHz at a 50% duty cycle. Here is a screen grab of that plot:



and the simulation circuit:


I have the LTspice file also attached. Other points look good from what I can tell such as the PWM signals:


So my question is, is the plot correct and I'm missing something fundamental here or is there something incorrect about the way I have things setup in terms of parameters?

 

You are using no mosfet models.

 

You are using no mosfet models.

Face palm. Thank you so much

 

With so many cycles shown in post #1 it is not possible to see anything like distortion on the wave form. showing only 3 cycles will provide a much more detailed image.