Control circuit power supply circuit and power supply circuit in

Details Control circuit power supply circuit and power supply circuit in Control circuit power supply circuit and power supply circuit in

1998-11-02

1999-09-14

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

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

363 49, 363 56, H02M 3335

Patent

active

059532190

ABSTRACT:
A control power supply circuit adapted for the reduction of conduction loss at a low load and for providing overcurrent protection operation. The control power supply circuit operates to supply power having a control voltage to a control circuit. In addition to a main power supply circuit in which an output voltage from an auxiliary coil flows through diodes, a choke coil, and a power source capacitor to be rectified and smoothed, and the power is supplied for the control circuit from the main power supply circuit, and wherein a start-up circuit in which an output voltage from an input power source flows through a resistor and transistors, and wherein power is supplied to the control circuit at starting-up and during overvoltage protection operation, there is provided in the control power supply circuit an auxiliary power supply circuit in which an output voltage from the auxiliary coil is rectified and smoothed by a rectifying circuit and a capacitor and stabilized at the control voltage by a transistor acting as a series regulator, and the power is supplied to the control circuit at a low load and during overcurrent protection operation.

REFERENCES:
patent: 3781638 (1973-12-01), Anderson et al.
patent: 4156273 (1979-05-01), Sato
patent: 4236187 (1980-11-01), Mochizuki et al.
patent: 4751629 (1988-06-01), Shimizu et al.
patent: 4754386 (1988-06-01), De Weerd
patent: 5293308 (1994-03-01), Boys et al.
patent: 5768118 (1998-06-01), Faulk et al.
patent: 5812383 (1998-09-01), Majid et al.
patent: 5831839 (1998-11-01), Pansier
patent: 5838556 (1998-11-01), Yokoyama

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