Interleaved active clamp flyback converter

Thread Starter


Joined Nov 18, 2019
as per the figure we provides a dc voltage as a input to the interleaved active clamp flyback converter block, provide a PWM signal to the MOSFET which is in interleaved block for switching purpose. PWM signal is generated by the microcontroller which has a fix frequency 57 KHz and 50 % duty cycle then we got a output like triangular waveform. actually we will need a output like a given figure so which type of PWM output will be provided to the switching MOSFET, so we got proper output of the interleaved active clamp flyback converter.



Joined Sep 17, 2013
Welcome to AAC!
You will need to vary the PWM duty cycle in a half-sinusoid manner such that it follows the desired output waveform. This is usually done using a look-up table.


Joined Aug 21, 2008
...and the appropriate interrupts to read the next table entry and sent it to the PWM module.

Following PWM you will need a reconstruction filter to smooth out the transitions between samples.

As an example, here is a cycle of a sine wave as 96 samples.

;Assumes a bipolar sine wave with a count of 128 being the midpoint
;.db 128,136,144,152,160,168,176,184,191,198,205,211,217,223,228,233,237,241,245,248,250,252,253,254,255,254,253,252,250,248,245,241,237,233,228,223,217,211,205,198,191,184,176,168,160,152,144,136,128,119,111,103,95,87,79,71,64,57,50,44,38,32,27,22,18,14,10,7,5,3,2,1,1,1,2,3,5,7,10,14,18,22,27,32,38,44,50,57,64,71,79,87,95,103,111,119,0