Protection circuit for switching mode power supply circuit

Details Protection circuit for switching mode power supply circuit Protection circuit for switching mode power supply circuit

1988-11-30

1990-04-03

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 19, 363 97, H02M 13335

Patent

active

049145606

ABSTRACT:
A protection circuit for a switching mode power supply circuit which outputs a constant voltage interrupts the ON-OFF switching operation of the switching transistor when an overvoltage state is detected. This protection circuit includes a switching transistor, a diode, a phototransistor, a thyristor, and a capacitor, in conjunction with a photodiode, a zener diode and a thyristor. If either an overvoltage is detected or an overcurrent is detected due to the load circuit being short circuited, the protection circuit simultaneously prevent the power supply input from the power input line from being unnecessarily lost.

REFERENCES:
patent: 4443838 (1984-04-01), Yamada
patent: 4595977 (1986-06-01), von der Ohe
patent: 4649464 (1987-03-01), Shono
patent: 4763235 (1988-08-01), Morita
patent: 4763236 (1988-08-01), Usui

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