Snubber Circuit Mosfet. When the mosfet turns off a high voltage spike occurs on the drain pin because of a res onance between the leakage inductor llk of the main trans former and the output capacitor coss of the mosfet. The first classification of snubber circuits is wheth er they absorb energy in controlling a voltage or a current.
Without the snubber the rate would be more or less only limited by the difference of load and switch current and the output capacitance of the switch. This snubber circuit is used to limit dv dt during turn off of the switch by presenting a higher load capacitance to the inductive load usually driven by the transistor. It has fewer components but has relatively longer wire s.
Effect of snubber capacitors the surge waveforms occurring between drain and source when the sic mosfet is turned off and current is cut off are shown for the above three conditions.
This snubber circuit is used to limit dv dt during turn off of the switch by presenting a higher load capacitance to the inductive load usually driven by the transistor. This allows us to simplify the analysis. When the mosfet turns off a high voltage spike occurs on the drain pin because of a res onance between the leakage inductor llk of the main trans former and the output capacitor coss of the mosfet. Theory design and application philip c.
