Voltage sequencing circuit for sequencing voltage to an...

Details Voltage sequencing circuit for sequencing voltage to an... Voltage sequencing circuit for sequencing voltage to an...

H - Electricity

02

H

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H02H 9/00 (2006.01) H03K 17/28 (2006.01)

Patent

CA 1079804

ABSTRACT Field Effect Transistor (FET) integrated circuits can be deleteriously affected by positive voltages without compensating negative voltages. This problem can be overcome by providing a sequencing circuit which prevents the application of positive voltages without compensating negative voltages. This can be accomplished by providing one electronic switch in the positive lead and connecting a second electronic switch to the control electrode of the first switch. The second switch is only conductive when the negative voltage is available and the first switch can only be conductive when the second switch is conductive. A delay circuit ensures that the second switch is conductive only after the negative voltage is applied to the load and a charge storage device ensures that negative potential is applied to the load after removal of the negative power source to ensure removal of positive potential to the load before the negative potential is removed. -1-

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