Power supply supervisor with independent power-up delays and a s

Details Power supply supervisor with independent power-up delays and a s Power supply supervisor with independent power-up delays and a s

1991-08-21

1993-06-29

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 94, H02H 3027

Patent

active

052240100

ABSTRACT:
A power supply monitoring circuit, and a data processing system incorporating the same together with a regulated power supply and system components such as a CPU, are disclosed. The power supply monitoring circuit includes delay circuits, with the respective delays selected by the selection of capacitor values, for delaying the issuing of a "power-good" signal to the CPU after power-up until sufficient time has passed after establishment of adequate voltages on the power supply bus to allow the power supplies to stabilize, and for ignoring undervoltage faults (in generating a power supply shutdown signal) on said power supplies for a brief period of time after power-up. The stabilization and power-up delay periods may be selected independently from one another, so that the power-up delay can expire prior to the expiration of the stabilization delay. In this way, the power supply can be promptly turned off if an undervoltage condition is present during power-up, reducing the risk of component damage from absence of adequate power supply voltages.

REFERENCES:
patent: 4600962 (1986-07-01), Bliehall
patent: 4638175 (1987-01-01), Bradford et al.
patent: 4771356 (1988-09-01), Hastings
patent: 4772980 (1988-09-01), Curtis et al.
patent: 4951171 (1990-08-01), Tran et al.
patent: 4980791 (1990-12-01), Aberkrack et al.
patent: 4999730 (1991-03-01), Pickard

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