Power source circuit incorporating a protection device therein a

Details Power source circuit incorporating a protection device therein a Power source circuit incorporating a protection device therein a

1994-06-15

1995-09-19

Deboer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 97, H02H 308

Patent

active

054521742

ABSTRACT:
A power source circuit is provided having a high frequency transformer 16, a switching control circuit 15 connected with the primary winding of the transformer 16, rectifier circuits 17, 18 and 20 connected with the secondary winding of the transformer 16 for outputting a D.C. voltage to an external circuit, an alarm detection circuit 25, an excess current detection circuit 26, and an excess current detection delay circuit 28. When the alarm detection circuit 25 detects an excess current in supplying power source, the power source supply is suspended by turning off the output of the switching control circuit 15 after the lapse of the preset time. When the excess current flows after the lapse of the initial preset time t.sub.s from turning on the power source, the excess current detection circuit 26 detects it so that the output of the switching control circuit 15 is turned off.

REFERENCES:
patent: 4943766 (1990-07-01), Suzuki
patent: 5113304 (1992-05-01), Ozaki et al.

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