Start-up circuit for a switch mode power supply

Details Start-up circuit for a switch mode power supply Start-up circuit for a switch mode power supply

1987-01-27

1988-06-28

Wong, Peter S.

Electric power conversion systems

Current conversion

With starting arrangement

363 86, 323901, H02P 1300

Patent

active

047543876

ABSTRACT:
A start-up circuit for a switch mode power supply includes a transformer supplying a full wave rectifier and developing a reference potential from a zener diode connected at the output thereof. An SCR has its anode-cathode circuit connected between the rectifier output and the input terminal of the switch mode power supply and its gate coupled to the zener diode. The power supply applies a boot strap voltage, higher than the reference potential, to its input terminal which back biases the gate of the SCR. The transformer is, therefore, effectively disconnected from the switch mode power supply after start-up. The start-up circuit also can function as a voltage regulator in which the rectifiers conduct as needed during the AC voltage ripple peaks to maintain an output voltage determined by the reference potential.

REFERENCES:
patent: 3868562 (1975-02-01), Marshall
patent: 4246634 (1981-01-01), Purol
patent: 4675798 (1987-06-01), Jost et al.

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