Abnormal condition detective circuit for a switching regulator

Details Abnormal condition detective circuit for a switching regulator Abnormal condition detective circuit for a switching regulator

1986-10-20

1988-01-05

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

361 92, 340661, H02H 7122

Patent

active

047179970

ABSTRACT:
This detective circuit detects an abnormal drop of an input voltage of a switching regulator of the flyback system. From the secondary winding of the switching regulator, a constant voltage controlled dc voltage is delivered through a diode. This circuit is provided with a peak voltage charging circuit which detects the peak value of a voltage produced in a direction opposite to the forward direction of the diode, and a voltage comparator which compares the peak value with a setting value. Since this peak value is in proportion to the input voltage, the output of the voltage comparator indicates an abnormal drop of the input voltage.

REFERENCES:
patent: 3935511 (1976-01-01), Boulanger et al.
patent: 4099068 (1978-07-01), Kobayashi et al.
patent: 4323961 (1982-04-01), Josephson

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