Zero standby current switch method and apparatus

Details Zero standby current switch method and apparatus Zero standby current switch method and apparatus

1985-12-09

1987-09-08

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323901, G05F 156

Patent

active

046926887

ABSTRACT:
A bipolar switch is disclosed having a near zero standby current characteristic, low output impedance in the "on" state, and near infinite impedance in the "off" state. The switch is responsive to a control signal to apply regulated power to a load. The switch includes a turn-on detect circuit which is powered solely from the control signal, and switching circuitry which is powered from a power source but which normally draws no standby current when the switch is in its "off" state. The switching circuitry includes speed-up circuitry to permit rapid turn-on, circuitry which employs positive feedback to achieve high current gain, and circuitry for rapidly turning off the switch.

REFERENCES:
patent: 4340851 (1982-07-01), Nishikawa
patent: 4476428 (1984-10-01), Iwasawa et al.
patent: 4566060 (1986-01-01), Hoeksma
patent: 4574232 (1986-03-01), Petty

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