Switching power source circuitry having a current bypass circuit

Details Switching power source circuitry having a current bypass circuit Switching power source circuitry having a current bypass circuit

1995-10-19

1998-01-06

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 20, H02H 7122

Patent

active

057061874

ABSTRACT:
Power source circuitry is disclosed and has a DC power source and a switching circuit positioned at the primary side, a diode and a coil positioned at the secondary side and serially connected to a load, and a capacitor connected in parallel to the load. A current bypass circuit is connected in parallel to the load, and operates when a voltage applied to the load momentarily increases. When a current flowing through a load sharply decreases, the current bypass circuit conducts an abnormal current to be input to the load to the negative side. This suppresses the momentary increase in the voltage applied to the load. In a normal condition, no potential differences occur between the base and the emitter of a transistor, so that the transistor remains in an OFF state and prevents a current from flowing through the bypass circuit.

REFERENCES:
patent: 4002959 (1977-01-01), Schadlich et al.
patent: 4010342 (1977-03-01), Austin
patent: 4054830 (1977-10-01), Harrel
patent: 5014177 (1991-05-01), Nuechterlein

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