Switch mode power supply for a television receiver and method of

Details Switch mode power supply for a television receiver and method of Switch mode power supply for a television receiver and method of

1993-03-04

1995-01-10

Peckman, Kristine L.

Electric power conversion systems

Current conversion

With starting arrangement

363 97, 348730, H02M 324, H04N 563

Patent

active

053813294

ABSTRACT:
A method of controlling the switching transistor in the switch mode power supply of a television receiver includes the steps of selectively operating the transistor in a stand-by state, a start-up state and an ON-state. During the stand-by state the switching transistor is rendered conductive by applying bursts of pulses at a frequency above, and unsynchronized with, the line frequency of the television receiver. The pulses are separated by changing intervals. During the start-up state the frequency of said bursts of the pulses is continuously reduced and pulses and the duration of the on time of the transistor is determined using a regulation voltage. During the ON-state, line synchronizing pulses are applied and the switching transistor is regulated to the line frequency.

REFERENCES:
patent: 4209826 (1980-06-01), Priegnitz
patent: 4761723 (1988-08-01), Lendaro
patent: 4868662 (1989-09-01), Hartman et al.
patent: 4937728 (1990-06-01), Leonardi
patent: 4941078 (1990-07-01), Leonardi
IEEE Transactions on Consumer Electronics, vol. 36, No. 1, Feb. 1990, P. Maige et al., "A universal power supplyintegrated circuit for TV and monitor applications", pp. 10-17.

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