Free running flyback DC power supply with current limit circuit

Details Free running flyback DC power supply with current limit circuit Free running flyback DC power supply with current limit circuit

1989-04-17

1990-06-12

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, 363131, 363 56, 361 91, 361111, H02M 324

Patent

active

049338293

ABSTRACT:
The present invention relates to a DC power supply of the free-running flyback type and a current limit circuit incorporated therein. The current limit is changed as a function of AC line voltage thereby reducing the worst case peak power dissipation in the power switching transistor. In one embodiment, one or more turns on the transformer provides a sensing voltage proportional to supply voltage to vary the switching transistor current limit as a function of supply voltage.

REFERENCES:
patent: 4104714 (1978-08-01), Smith et al.
patent: 4224659 (1980-09-01), Iguchi
patent: 4272806 (1981-06-01), Metzger
patent: 4323961 (1982-04-01), Josephson
patent: 4425611 (1984-01-01), Easter
patent: 4494178 (1985-01-01), Ishima
patent: 4668905 (1987-05-01), Schierjott
patent: 4769752 (1988-09-01), Rackowe

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