The idea: Drive a MosFet H-Bridge with the upper transistors with a PWM output signal (freq of ~1KHz) and lower transistor with a low requency NCO output signal (0-50Hz).

Requirement is to have two modes of operation. One in full bridge, so the load accepts changing polarity according to NCO and the power controlled by the PWM signal.

The other mode drives the load with one polarity only, NCO drives the On/Off state of the load and again PWM the power.

Have setup the NCO correctly on the 16F18446 chip, along with the PWM so then one polarity signal can be produced.

But cannot thing how I can drive output for full bridge mode. It is not exactly as PWM driving fullbridge since I need also a low freq signal for the polarity change along with higher frequency PWM signal.

If waveforms are needed to clarify things I may draw them on paper and scan then.

Ioannis