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Absorbing Capacitor Charging And Discharging Control Circuit

2014-11-04 01:30  
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Absorbing Capacitor Charging And Discharging Control Circuit
In the circuit shown in picture (a), VF1 is the primary side main MOSFET. The pulses from the PWM integrated controller can make it working in connected/disconnected mode. To make the VF2's connected/disconnected time be opposite to VF1, it adds the bidirectional time delay circuit S1. Now if the VF1 is in disconnected mode, the VF2 is in connected mode, the absorbing capacitor Cr would charge to the voltage between VF1's drain electrode and source electrode. So it also absorb the surge voltage on VF1. After the delay time, which is determined by the time delay circuit, the VF2 is disconnected. But at this time, the Cr two ports' voltage is equal to the voltage on VF1. So it is the zero-voltage and zero-current switching devices disconnected mode.