Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1989-11-03
1991-04-09
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
323222, 363 81, 363 89, H02M 7217
Patent
active
050069756
ABSTRACT:
A power factor correction circuit in which a divided-down version of a rectified input waveform is sampled approximately at its peak by a sample-and-hold circuit. The peak value is then processed to produce a correction signal which is subtracted from the original divided down rectified signal. This produces a reference signal which is then multiplied by the output of an error amplifier to produce a sinusoidal reference signal for the input current. The output of the error amplifier which is used is that which is sampled periodically when the divided-down rectified signal approaches zero volts. The sinusoidal reference is used by peak and valley comparators whose other inputs come from a current sense amplifier. The outputs of the comparators are used to switch a shunting transistor which controls the input current to achieve near unit y power factor.
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Neufeld, Herman, "Control IC for Near Unity Power Factor in SMPS", published in the Power Conversion and Intelligent Motion Control Conference (PCIM), dated Oct. 16, 1989.
Asher Robert M.
Beha Jr. William H.
Cherry Semiconductor Corporation
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