Switched-mode power supply circuit including a starting circuit

Details Switched-mode power supply circuit including a starting circuit Switched-mode power supply circuit including a starting circuit

1990-02-12

1991-08-20

Beha, Jr., William H.

Electric power conversion systems

Current conversion

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

363 49, 363 56, H02M 3335, H02M 75375

Patent

active

050419560

ABSTRACT:
A switched mode power supply circuit includes a controllable switch for controlling the current in the supply transformer of the power supply circuit. During normal operation of the power supply, its DC output voltage is maintained at a substantially constant, first value in spite of variations of the DC input voltage and of the load on the output voltage by controlling the duration of the conductivity time of the switch. A function generator supplies a signal, which is a given function of the output voltage, to a control input of a pulse duration modulator for determining the duration of the conductivity time. At an output voltage which is considerably lower than the first value, the signal of a starting circuit is passed on by a selection circuit to the said control input in order to increase the conductivity time of the switch. This signal corresponds to a shorter switch conductivity time than does the signal of the function generator. At the instant when the output voltage reaches the first value, the selection circuit blocks the passage of the start signal and passes on the signal of the function generator. The power supply thus provides a soft start with limited energy dissipation.

REFERENCES:
patent: 3959714 (1976-05-01), Mihelich
patent: 4180852 (1979-12-01), Koizumi et al.
patent: 4353114 (1982-10-01), Saleh
patent: 4688159 (1987-08-01), Marinus
patent: 4791544 (1988-12-01), Gautherin et al.
Stuedemann, Funk-Technik 37 (1982), Heft 1, pp. 21-25.
Stephens, "Flyback Converters for Multirail Switchers", New Electronics, vol. 14, No. 14, pp. 58-60, Jul. 14, 1981.
Biamonte 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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