Method and apparatus for distinguishing between failure of a pow

Details Method and apparatus for distinguishing between failure of a pow Method and apparatus for distinguishing between failure of a pow

1995-11-14

1997-09-16

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Substitute or emergency source

307 80, 307 85, 364DIG1, 364DIG2, 3642734, 3649485, H02J 700

Patent

active

056684177

ABSTRACT:
A power loss detection system for a power supply including a main converter for providing regulated power, an activation circuit for mining on and off the main converter based on an active low activation signal, a standby power circuit for providing a standby power signal, and an internal pullup resistor coupled between the standby power and activation signals. The power supply asserts a power status signal indicative of the status of regulated power. Alternatively, an external detection circuit monitors the regulated power from the power supply and asserts a power loss signal indicative thereof. The control circuit asserts the activation signal low to turn on the main converter or floats the activation signal to turn off the main converter. If the power good or power loss signal indicates loss of regulated power, the control circuit floats the activation signal. If the activation signal goes or remains low after the activation signal is floated, then the power source has failed. If the activation signal is pulled high, then the power supply has failed. If the power supply has failed, then the control circuit asserts a failure signal indicative thereof. The present invention is particularly advantageous in a redundant power supply system for supplying power to a computer system, where both power supplies provide standby power.

REFERENCES:
patent: 4782355 (1988-11-01), Sakai et al.
patent: 5475271 (1995-12-01), Shibasaki et al.
patent: 5481730 (1996-01-01), Brown et al.

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