Apparatus for freeing electronic one-way switches from high powe

Details Apparatus for freeing electronic one-way switches from high powe Apparatus for freeing electronic one-way switches from high powe

1984-10-19

1987-05-26

Shaw, Clifford C.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

323289, 361 91, H03K 1708

Patent

active

046690239

ABSTRACT:
A circuit arrangement in combination with an electronic one-way switch connected between a voltage supply and a load, the arrangement freeing the one-way switch of high power dissipation stresses during turn-on and turn-off. The arrangement includes a shunt circuit connected across the one-way switch, the shunt circuit including an inductive storage element and a first capacitive storage element; a free-wheeling diode connected for providing a current path for current through the load when the one-way switch is turned off; a second capacitive storage element connected to the first capacitive storage element; and an auxiliary voltage source connected for charging the second capacitive storage element and for causing the second capacitive storage element to drive a current through the load via the first capacitive storage element after the switch is turned off and before the path provided by the free-wheeling diode begins carrying the current through the load.

REFERENCES:
patent: 4365171 (1982-12-01), Archer
Thomas A. Radomski, "Protection of Power Transistors in Electric Vehicle Drives", IEEE, 1982, pp. 455-465.

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