Power supply without using electrolytic capacitor at input side
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United States of America Patent
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Dec 8, 2015
Grant Date -
N/A
app pub date -
Feb 4, 2015
filing date -
Jan 21, 2015
priority date (Note) -
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Abstract
A power supply is provided, including a bridge rectifier, a film capacitor and a DC-to-DC converter. The bridge rectifier rectifies an input voltage of an AC power supply to produce a full-wave rectified voltage. The film capacitor filters the full-wave rectified voltage to produce a first pulsating DC voltage. A control circuit of the DC-to-DC converter attenuates the first pulsating DC voltage to produce a second pulsating DC voltage, detects a peak value and a valley value of the second pulsating DC voltage, and produces an OCP compensation value of −(Vx−VH)+PH accordingly, where Vx refers to the second pulsating DC voltage, VH refers to the valley value, and PH refers to the peak value. The control circuit provides an OCP function and a constant output power limitation for the DC-to-DC converter according to a compensated OCP setting value produced by adding the OCP compensation value to an OCP setting value.
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