Before the cut-off buffer circuit is cut off, the switch current is Io, the switch voltage drop is nearly 0, and the diode D1 is off. When the switch is cut off: when there is no capacitor , the switch increases linearly from 0 to Vs within the time Tf1, and the switch current maintains Io. When the switch voltage is Vs, the diode D1 is on, the switch current is, and the current Io-Isw flows back to the power supply through the diode D1. When there is a capacitor
Reference address:Cut-off damping circuit
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