Frequency modulated, switching power supply

Details Frequency modulated, switching power supply Frequency modulated, switching power supply

1993-07-28

1996-09-10

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323282, 323299, H02M 7155

Patent

active

055551688

ABSTRACT:
A switching power supply in which the oscillation frequency is dynamically controlled to have an instantaneous frequency value which is reduced when the power line waveform is near its peaks. This is preferably accomplished by a divider circuit, which provides an output current proportional to the ratio between the instantaneous value of the rectified voltage and the long-term-averaged value of that voltage. This output current is fed into a ramp generator, to dynamically shift the frequency of the ramp generator as the output current changes. This circuit is indifferent to power line voltage and frequency (over a fairly wide range), and therefore may be used in different countries having different power standards.

REFERENCES:
patent: 3946330 (1976-03-01), Takahashi
patent: 4712169 (1987-12-01), Albach
patent: 4816982 (1989-03-01), Severinsky
patent: 5357418 (1994-10-01), Clavel

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