Low voltage shutdown circuit

Details Low voltage shutdown circuit Low voltage shutdown circuit

1986-10-23

1987-11-24

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

323284, 323288, 323299, 323902, 361 92, H02H 7122

Patent

active

047093200

ABSTRACT:
A low voltage shutdown circuit for a PWM power supply includes a voltage divider supplying bias for a transistor having a load resistor that is part of an integrating network. The capacitor in the integrating network is coupled to a voltage sensitive switch (Diac) which feeds an LED detector in a photo optic coupler. Under normal conditions, the transistor is in saturation and the capacitor is discharged. The transistor comes out of saturation when the voltage level across the divider drops to a predetermined level and the capacitor charges to the trigger voltage of the Diac, which fires the LED in the photo optic coupler for developing a shut-off signal.

REFERENCES:
patent: 3749944 (1973-07-01), Luebrecht
patent: 4027204 (1977-05-01), Norbeck
patent: 4634956 (1987-04-01), Davis et al.

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