Protective shut-down system for switch-mode power supply

Details Protective shut-down system for switch-mode power supply Protective shut-down system for switch-mode power supply

1994-12-20

1996-03-12

Deboer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 86, 361 91, 363 53, 323901, H02H 7125

Patent

active

054991544

ABSTRACT:
For overcurrent protection of a switch-mode power supply in a high power audio amplifier, an active feedback overload shut-down circuit acts though a control input of a PWM (pulse-width modulator) in the switch-mode power supply. In a multi-output switch-mode power supply, e.g. a dual-rectifier supply providing .+-.53 volts and .+-.100 volts suitable for a class H amplifier, instantaneous currents in each of the two rectifier circuits are monitored by primary windings of a current-sensing transformer, providing from its secondary winding a signal that is rectified and monitored by a comparator-timer for current overload at a predetermined threshold. The primary windings are made to have a particular turns ratio so as to proportion the protection sensitivity for each dc output voltage. Upon sensing overload from either rectifier circuit, the comparator-timer applies a shut-down signal to the PWM, shutting down the power supply safely for a predetermined time period, e.g. 17 seconds. Then a "soft" start-up is initiated; if the overload has been removed, normal operation resumes, otherwise another 17 second shut-down cycle is initiated and will repeat until the overload is remedied. The fast response of the overload protection also serves to protect the amplifier.

REFERENCES:
patent: 3670234 (1972-06-01), Joyce
patent: 4254443 (1981-03-01), Wilson, Jr.
patent: 4447841 (1984-05-01), Kent

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