This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PWM for Push-Pull converters

Hi,

The PWM modulation below can be used for a current mode push-pull converter?
The current should be sampled once or twice in a cycle?

Would be better if PWM1B be set on Period and reset on CB down? Losing this way the reference for the center of the pulse but avoiding the need to commutate the transistors at the same time.

Ari.

  • Ari,

    Posting for a colleague:

    Hello Ari,

    Yes, what you are suggesting is possible. To avoid needing dead-time (DT), you will need to restrict the maximum duty cycle (on-time) by keeping CMPA < PRD- (min DT) and CMPB > (min DT).

    For current mode control and/or to guarantee/approach flux balancing you might need to sample the current twice in a cycle (once in each half). If that's the case and if you are running out of ADC start of conversion (SOC) trigger sources in your above PWM configuration, you may use other SOC sources in another (spare) PWM module that is synchronized with the above PWM module.

    I hope this helps.

    Hrishi

    Thank you,
    Brett