Electricity: electrical systems and devices – Safety and protection of systems and devices – Voltage regulator protective circuits
Patent
1982-03-29
1983-09-20
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Voltage regulator protective circuits
363 56, H02H 320, H02H 7122
Patent
active
044059647
ABSTRACT:
A protection circuit for a switching regulator power supply comprises a series-pass transistor having a collector-emitter circuit connected between a source of DC operating potential and the power supply. A bootstrap signal developed by the power supply and having a voltage level greater than the potential of the DC source is fed back to the base of the series-pass transistor for rendering the transistor fully conductive under normal operating conditions and to improve performance under marginally low levels of the DC source. A reverse biased diode is connected between the base of the series-pass transistor and the DC source to limit the transistor's base drive via the feedback path to a safe level. A shunting transistor is responsive to an overvoltage condition of the DC source for reducing the base drive of the series-pass transistor to limit the DC potential supplied to the power supply to a safe level.
REFERENCES:
patent: 3522482 (1970-08-01), Thompson
patent: 3582713 (1971-06-01), Till
patent: 3733519 (1973-05-01), Griffey
patent: 4008418 (1977-02-01), Murphy
patent: 4024437 (1977-05-01), Suzuki
patent: 4254443 (1981-03-01), Wilson, Jr.
Sutton Leroy A.
Woods Jonathan L.
Kail Jack
Moose Jr. Harry E.
Zenith Radio Corporation
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