Power supply start-up circuit with high frequency transformer

Details Power supply start-up circuit with high frequency transformer Power supply start-up circuit with high frequency transformer

1987-05-06

1988-08-16

Wong, Peter S.

Electric power conversion systems

Current conversion

With starting arrangement

363 97, 323901, H02P 1318

Patent

active

047648570

ABSTRACT:
A start-up circuit for a switch mode power supply comprises a relaxation oscillator including an RC charging circuit for developing a trigger voltage for firing a Sidac connected in series with the primary winding of a small ferrite core transformer. The secondary winding of the transformer is resonated with a tuning capacitor and the voltage coupled to a rectifying circuit for developing a charge across a trigger capacitor. When the trigger capacitor voltage achieves a trigger potential, an SCR is fired for starting a pulse width modulator in the switch mode power supply. The relaxation oscillator is rendered ineffective by a feedback voltage supplied from the power supply when it starts.

REFERENCES:
patent: 4063307 (1977-12-01), Stephens
patent: 4695936 (1987-09-01), Whittle

Affiliated with

Also associated with

Rating

Power supply start-up circuit with high frequency transformer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Power supply start-up circuit with high frequency transformer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power supply start-up circuit with high frequency transformer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-603947