Switch mode power supply start-up circuit

Details Switch mode power supply start-up circuit Switch mode power supply start-up circuit

1989-03-06

1990-05-22

Beha, Jr., William H.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 16, 363 49, H02M 5458, H02M 75375

Patent

active

049282182

ABSTRACT:
A switch mode power supply includes an AC to DC converter, a pulse width modulator for generating a series of pulses to control the switching of the DC across the primary winding of a transformer, and a start-up circuit connecting the AC to a power input of the pulse width modulator. A thermistor provides thermal protection for converter and start-up circuit components during abnormal operation, and a switch for disconnecting the start-up circuit and bypassing the thermistor after the power supply has been started improves power supply efficiency by eliminating power loss through the start-up circuit and thermistor.

REFERENCES:
patent: 3349313 (1967-10-01), Wilmarth
patent: 3935511 (1976-01-01), Boulanger et al.
patent: 4130862 (1978-12-01), Holt
patent: 4236198 (1980-11-01), Ohsawa et al.
patent: 4344122 (1982-08-01), Jones
patent: 4400767 (1983-08-01), Fenter
patent: 4450514 (1984-05-01), Peruth
patent: 4586120 (1986-04-01), Malik et al.
patent: 4686616 (1987-08-01), Williamson
patent: 4740880 (1988-04-01), Peruth
patent: 4754385 (1988-06-01), McDade et al.
Biaimonte et al., "Transistor Switching Regulator Starting and Monitoring", IBM Tech. Discl. Bul., vol. 23, No. 12, pp. 5449-5451, May 1981.

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