AuthenticQ
Newbie level 3
Hello all, I am designing a bidirectional DC DC converter comprising of two resonant tank. My topology is like two H bridge giving two square wave output to two LLC resonant tanks. I am employing PFM to maintain constant output voltage.
I have designed single core dual primary dual secondary HF transformer using PQ50/50 core with eqaul turn ratio of 4.2. The magnetizing inductance is around 570uH. The total resonant inductance is 136 uH and resonant capacitance is 111.86 nF.
However, the two square wave input from H bridge are not identical. Kindly look at the waveform. Blue and Pink are two input square waveform. and Cian n green is the secondary output of both transformer.
There is a DC offset in the H-bridge output waveform.
What could be the reason for it?
I employed a roughly designed RCD snubber too but of no use.
Please help. Thanks
I have designed single core dual primary dual secondary HF transformer using PQ50/50 core with eqaul turn ratio of 4.2. The magnetizing inductance is around 570uH. The total resonant inductance is 136 uH and resonant capacitance is 111.86 nF.
However, the two square wave input from H bridge are not identical. Kindly look at the waveform. Blue and Pink are two input square waveform. and Cian n green is the secondary output of both transformer.
There is a DC offset in the H-bridge output waveform.
What could be the reason for it?
I employed a roughly designed RCD snubber too but of no use.
Please help. Thanks