Control circuit for dual power supply having different start-up

Details Control circuit for dual power supply having different start-up Control circuit for dual power supply having different start-up

1992-08-11

1993-11-16

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With starting arrangement

363 21, 363 71, H02M 3335

Patent

active

052629333

ABSTRACT:
A control circuit for a switching power supply. First and second transformers for outputting different voltages are controlled by first and second switches. The switches are controlled by first and second control means which are turned on when the applied voltage exceeds a specified start-up voltage, and off when the voltage drops below a lower shut-down voltage. A reference voltage charges a capacitor, which is then added to the operating voltage of the circuit so that the start-up voltage can be applied even though the operating voltage of the circuit is lower than the start-up voltage. A third control means controls the change from one switch to the other at the desired voltage levels. The use of lower operating voltages allows the circuit to more rapidly drop below the shut-down voltage when abnormal operation occurs.

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