Switching power source control circuit for controlling a variabl

Details Switching power source control circuit for controlling a variabl Switching power source control circuit for controlling a variabl

1994-06-15

1996-04-30

Wong, Peter S.

Electric power conversion systems

Current conversion

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

323282, H02M 3335, G05F 140

Patent

active

055130895

ABSTRACT:
A switching power source control circuit comprising a comparator, a thin-out-processed pulse generator, a thinned-pulse detector, and a reset speed regulator, wherein: the comparator compares an output signal of an error amplifier with a variable reference voltage generated by the reference voltage regulator to generate a signal for performing thin-out operation in accordance with a voltage difference between the output signal of the error amplifier and the reference voltage; the thin-out-processed pulse generator generates thin-out-processed pulses on the basis of the output signal of the comparator; the thinned-out pulse detector detects the generation of thinned-out pulses or driving pulses while always monitoring the thin-out-processed pulses generated from the thin-out-processed pulse generator, and changes the reference voltage of the reference voltage regulator in the case where the thin-out rate is in a range of from 0 to 1/2 in the direction to make it difficult to perform thin-out operation to thereby prevent continuation of thin-out operation whenever one thinned-out pulse is detected; and the reset speed regulator resets the reference voltage of the reference voltage regulator to an initial value in accordance with the output signal of the error amplifier.

REFERENCES:
patent: 4344121 (1982-08-01), Weber
patent: 4513360 (1985-04-01), Ikenoue et al.
patent: 4524413 (1985-06-01), Ikenoue et al.
patent: 5278490 (1994-01-01), Smedley
patent: 5349514 (1994-09-01), Ushiki et al.
patent: 5398181 (1995-03-01), Yek
patent: 5408402 (1995-04-01), Nonnenmacher

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