Power switch circuitry for electrically isolating the power swit

Details Power switch circuitry for electrically isolating the power swit Power switch circuitry for electrically isolating the power swit

1994-01-28

1996-03-12

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

With manual control of the output voltage or current

363 21, 363 95, 363131, H02M 3335

Patent

active

054991846

ABSTRACT:
A power switch circuit including a small signal transformer and a low power oscillator for detecting the power switch while isolating it from the primary of the power supply. When the power switch is off, or is otherwise pressed to turn off the power supply, the oscillator charges a capacitor. A sensing and control circuit coupled to the oscillator and capacitor grounds a vital signal of the power supply keeping the power supply turned off. In one embodiment, when the switch is turned on, it shorts the signal transformer disabling the oscillator, so that the capacitor is discharged and the sensing and control circuit releases the vital signal. In another embodiment, the power switch momentarily disables the oscillator and discharges the capacitor, so that the sensing and control circuit toggles a flip-flop circuit to turn on the power supply.

REFERENCES:
patent: 4631652 (1986-12-01), Wendt
patent: 4661896 (1987-04-01), Kobayashi et al.
patent: 4930062 (1990-05-01), Yamada
patent: 5008829 (1991-04-01), Cox et al.
patent: 5029269 (1991-07-01), Elliott et al.
patent: 5091837 (1992-02-01), Duspiva et al.
patent: 5189600 (1993-02-01), Keck et al.
patent: 5436820 (1995-07-01), Furmanczyk
Burke; "Low Voltage Control Circuit"; Jan. 1968, RCA TN No. 740.

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