Overcurrent protection circuit

Details Overcurrent protection circuit Overcurrent protection circuit

1998-07-07

1999-04-06

Nguyen, Matthew

Electric power conversion systems

Current conversion

Including automatic or integral protection means

361 18, H02M 7122, H02M 7100

Patent

active

058926658

ABSTRACT:
An overcurrent protection circuit provided for a switching power supply has a current detector, voltage superposition device, and circuit for reducing a driving pulse. The current detector detects a circuit current in the switching power supply and converts it to a voltage. The voltage superposition device generates a constant voltage and superposes the voltage onto the detected voltage converted by the current detector. The detected voltage onto which the constant voltage has been superposed is applied between the base and the emitter of a transistor which functions as the circuit for reducing the driving pulse. If an overcurrent flows through the switching power supply, the transistor is turned on and a current flows into the transistor. As a result, a voltage applied to a maximum-duty-cycle setting terminal of a PWM IC provided for the switching power supply and used for pulse-width-modulation control of a switch device is reduced, and the overcurrent is suppressed.

REFERENCES:
patent: 4210947 (1980-07-01), Koizumi
patent: 4330816 (1982-05-01), Imazeki et al.
patent: 4736264 (1988-04-01), Segger
patent: 4937724 (1990-06-01), Nakajima
patent: 5227964 (1993-07-01), Furuhata

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