Protected switch

Miscellaneous active electrical nonlinear devices – circuits – and – Gating – Utilizing three or more electrode solid-state device

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Details

327372, 327427, 323292, 323266, 361 90, 361 91, H03K 17687

Patent

active

057540748

ABSTRACT:
A protected switch has a power first semiconductor device having a first main electrode for coupling to a first voltage supply line, a second main electrode coupled to a first terminal for connection via a load to a second voltage supply line and an insulated gate electrode coupled to a control terminal for supplying a gate control signal to enable conduction of the power semiconductor device. A control arrangement has a normally off second semiconductor device having first and second main electrodes coupling the normally off semiconductor device between the gate electrode of the power semiconductor device and one of the first and second main electrodes of the power first semiconductor device and a control electrode coupled via a resistance to the gate electrode of the power semiconductor device thereby causing the normally off semiconductor device to be rendered conducting when a gate control signal is supplied to the gate electyrode to enable conduction of the power semiconductor device. A disabling arrangement including a normally off third semiconductor device inhibits conduction of the normally off semiconductor device during normal operation of the power semiconductor device.

REFERENCES:
patent: 4103181 (1978-07-01), Moreau
patent: 4691129 (1987-09-01), Einzinger et al.
patent: 4728826 (1988-03-01), Einzinger et al.
patent: 5028811 (1991-07-01), Le Roux et al.
patent: 5272399 (1993-12-01), Tihanyi et al.

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