Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1989-01-30
1989-08-22
Jennings, Derek S.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 33, 361111, H02H 300
Patent
active
048601527
ABSTRACT:
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.
REFERENCES:
patent: 4679112 (1987-07-01), Craig
patent: 4691263 (1987-09-01), Kenny et al.
patent: 4745510 (1988-05-01), McMurray
patent: 4752852 (1988-06-01), Agi et al.
Delco Electronics Corporation
Jennings Derek S.
Navarre Mark A.
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