High-voltage switch control

Details High-voltage switch control High-voltage switch control

1997-08-22

1999-09-28

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327 77, H03K 17687

Patent

active

059594942

ABSTRACT:
Method and circuitry for reliably controlling the state of a transistor switch under high voltage conditions are disclosed. The present invention monitors the level of an external signal applied to one terminal of the switch. If the level of the external signal is lower than a reference voltage such as the power supply voltage of the integrated circuit that comprises the switch, the control of the switch is passed to a digital signal internal to the integrated circuit. If the level of the external signal exceeds the reference voltage, then the present invention operates to allow the switch to be controlled by the external signal. This ensures that the switch is turned off, and remains off when it interfaces with voltages with absolute magnitudes higher than the highest internal voltage. The invention further ensures that the switch is turned off when no power is applied to the switch control circuit.

REFERENCES:
patent: 5028811 (1991-07-01), Le Roux et al.
patent: 5165046 (1992-11-01), Hesson
patent: 5576648 (1996-11-01), Rossi et al.
patent: 5801572 (1998-09-01), Nakamura

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