Power supply interlock for a distributed power system

Details Power supply interlock for a distributed power system Power supply interlock for a distributed power system

1992-04-01

1993-07-20

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363147, 361101, 364240, 364273, H03K 19003

Patent

active

052299260

ABSTRACT:
A power supply interlock technique for an electronic system which uses metal oxide semiconductor (MOS) logic circuits require two or more different supply voltages, and where each circuit board module contains its own power supplies. An open-collector enable signal is both controlled and sensed by each of the modules. The enable signal is set true when all of the supplies in the system are operating properly. However, the enable signal is set false by any one of the modules if one of the higher voltage supplies on that module is malfunctioning. The enable line also controls the lower voltage power supplies in each module. None of the lower voltage power supplies is thus permitted to operate until the enable line is set true, which occurs only when all of the modules indicate they have an operating high voltage supply available. As a result, latch-up of parasitic transistors in the circuits which drive logic signals on a system bus is avoided.

REFERENCES:
patent: 4279020 (1981-07-01), Christian et al.
patent: 4794525 (1988-12-01), Pickert et al.
patent: 4900951 (1990-02-01), Saito et al.
patent: 5008846 (1991-04-01), Inoue
patent: 5014236 (1991-05-01), Pogorzelski et al.

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