Switching regulator current limit circuit

Details Switching regulator current limit circuit Switching regulator current limit circuit

1983-12-19

1985-12-24

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 21, 361 18, 361 92, H02H 7122

Patent

active

045610479

ABSTRACT:
A series flyback switching regulator, having a transformer with a primary coil for receiving an unregulated input voltage and a secondary coil for providing a regulated output voltage, includes a circuit for limiting the magnitude of a substantial overload or short circuit current. The current limiting circuit senses the magnitude of current flowing through the primary coil and sets a current limit level which is based upon a predetermined maximum current allowed in the primary coil. The current limiting circuit also senses the magnitude of the voltage present at the secondary coil of the transformer and reduces the current limit level, based upon a sensed reduction in the secondary coil voltage. The input voltage is removed from the primary coil when the magnitude of the current through the primary coil exceeds the current limit level as reduced by the sensed reduction of the voltage appearing across the secondary coil.

REFERENCES:
patent: 4063307 (1977-12-01), Stephens
patent: 4330816 (1982-05-01), Imazeki et al.
patent: 4447841 (1984-05-01), Kent

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