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Part Number: TMS320F28035
Hi C2000 expert,
I'm trying to use F28035 in HSFB topology with PCMC control algorithm.
Now I'd would like to know if this device support duty match or not?
For example, if epwm1A and epwm1b are connected to primary side mosfet, epwm2a, epwm2b are used to control sencondary side mosfet. If CBC occurs on EPWM1A, i would like EPWM1B have same duty cycle with EPWM1A, is it possible to relized?
Below is the waveform what I want, CBC occurs on EPWM1A, EPWM1B should keep the same pulswidth with EPWM1A, is it possible? Thanks...
I am looking into this. In your system, will the CBC trip always occur before ePWM1B is high? If so approximatly how long before?
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In reply to Cody Watkins:
Regarding to HSFB topology, the pulse width of ePWM1A and ePWM1B are clamped within 50% duty, otherwise it will cause MOSFET damaged.
If there is no CBC while ePWM1A output 50% duty cycle, then ePWM1a just output 50% duty clcle, and epwm1B should have the same pulse width.
In reply to Jack Tan80:
Can you please help update about this?
Edited 1/12/18/ 2:52 PM CST.
due to the asynchronous nature of the CBC trip this would be difficult to predict within the PWM module. There are two ways around this.
Note: When making symmetric waveforms it is often helpful for you to use up-down-count mode!
Sure, you can close this thread. We have added a external exponent to fixed this instead of inside the chip. Thanks anyway.
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