Power supply start-up circuit

Details Power supply start-up circuit Power supply start-up circuit

1981-10-29

1983-09-20

Shoop, William M.

Electric power conversion systems

Current conversion

With starting arrangement

315209CD, 320 1, H02M 3135

Patent

active

044059752

ABSTRACT:
A power supply start-up circuit for apparatus having a storage capacitor comprises a bistable switch with a trigger terminal and connected between one terminal of a DC source and the storage capacitor, a resistor connected across the switch, a trigger capacitor connected to the trigger lead, and a diode connected between the trigger capacitor and the storage capacitor. The trigger lead on the switch is biased by the trigger capacitor which is charged through the diode to the voltage on the storage capacitor. When the storage capacitor is uncharged at start-up, the switch is biased off and charging current from the DC source to the storager capacitor passes through the resistor permitting a "soft" start, i.e., a gradual charging of the storage capacitor. Thereafter charging of the storage capacitor takes place through the switch when biased on by a voltage differential between storage and trigger capacitors.

REFERENCES:
patent: 3193750 (1965-07-01), Chait
patent: 3549851 (1970-12-01), Hockenberry
patent: 3781637 (1973-12-01), Potter
patent: 4092709 (1978-05-01), Voigt et al.

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