Power failure indicator

Details Power failure indicator Power failure indicator

1986-04-07

1987-10-27

Pellinen, A. D.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

361 91, H02H 712

Patent

active

047034106

ABSTRACT:
A power failure indicator circuit for a pulse width modulated power supply compares the averaged voltage of the pulse width modulated signal to an input reference voltage to determine if power failure of the supply will occur. The reference voltage corresponds to a predetermined proportion of the maximum average voltage of the pulse width modulated signal. In a preferred embodiment, the pulse width modulated signal is inverted and filtered to generate an averaged signal corresponding to the DC input voltage to the modulator within the pulse width modulated power supply. A comparator compares the averaged signal voltage to the reference voltage to determine if the averaged signal voltage level has fallen below the reference voltage level. If the averaged signal voltage level does drop below the reference voltage level, the comparator generates a signal warning of power failure of the power supply.

REFERENCES:
patent: 4030015 (1977-06-01), Herko et al.
patent: 4251883 (1981-02-01), Grants et al.
patent: 4291357 (1981-09-01), Hong
patent: 4535399 (1985-08-01), Szepesi
patent: 4562522 (1985-12-01), Adams et al.

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