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The protective circuit for a mosfet, which in an inductive load switches.
The protective circuit for a mosfet, which in an inductive load switches.
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机译：Mosfet的保护电路，在感性负载下切换。
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摘要
A snubber circuit comprising two stages regulates the gate current of a MOSFET in relation to the drain voltage at turnoff to clamp transient inductive voltages to a nondestructive level. At the onset of the turnoff, a current source is activated to discharge the gate capacitance, and the snubber controls the magnitude of such current in relation to the sensed drain voltage to stabilize the drain voltage at a nondestructive level. When the drain voltage approaches its limit value, a current injection circuit supplies additional current to the gate to sustain the MOSFET conduction, again in relation to the sensed drain voltage. When the inductive energy stored in the load is substantially dissipated, the drain voltage falls; at such point, the current injection circuit is disabled and the conduction of the current source is increased to complete the turnoff of the MOSFET.
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