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Power supplies and control methods capable of improving power factor during light load
Power supplies and control methods capable of improving power factor during light load
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机译:能够在轻载期间提高功率因数的电源和控制方法
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摘要
An apparatus is capable of improving the power factor of a power supply powered by a high power line and a ground power line. The apparatus comprises a line voltage detector and an ON time controller. The line voltage detector provides a scaled voltage to represent a line voltage of the high power line. The ON time controller has a valley voltage detector, which provides, in response to the scaled voltage, a valley representative representing a valley voltage of the line voltage. The ON time controller controls an ON time of a power switch in the power supply in response to the valley representative.
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