Short circuit protection for switch mode power supply

Details Short circuit protection for switch mode power supply Short circuit protection for switch mode power supply

1988-11-04

1990-04-10

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 86, 361 87, 361 92, 361 93, 323271, 323299, H02H 700

Patent

active

049165690

ABSTRACT:
A protection circuit for a switched mode power supply has a reference voltage applied through a resistor to a first input terminal of a comparator. The second input terminal of the comparator is supplied with an indicating voltage that is a function of the magnitude of input current to the supply. A capacitor precludes rapid changes in the voltage applied to the second input terminal. When a trip level is reached, the comparator operates a latch for disabling the pulse width modulator of the supply. A diode is coupled between the high capacity voltage output of the supply and the first input terminal of the comparator for rapidly changing the voltage applied to the first input terminal to operate the latch, in response to a significant decrease in voltage at the high capacity output.

REFERENCES:
patent: 4177389 (1979-12-01), Schott
patent: 4736264 (1988-04-01), Segger

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