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ZERO CURRENT DETECTION CIRCUIT FOR BRIDGELESS TOTEM POLE POWER FACTOR CORRECTION CONVERTER AND BRIDGELESS TOTEM POLE POWER FACTOR CORRECTION CONVERTER
ZERO CURRENT DETECTION CIRCUIT FOR BRIDGELESS TOTEM POLE POWER FACTOR CORRECTION CONVERTER AND BRIDGELESS TOTEM POLE POWER FACTOR CORRECTION CONVERTER
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机译：无桥图腾柱功率因数校正转换器和无桥图腾柱功率因数校正转换器的零电流检测电路
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摘要
A zero current detection circuit includes: one detection winding that is magnetically coupled to a boost inductor of a bridgeless totem pole DEC for converting an AC input voltage to a DC output voltage, has one end connected to ground, and generates a zero current detection signal, which changes in proportion to a boost inductor voltage, at another end; a resistor with one end connected to the other end of the detection winding; a clamp composed of two diodes connected to each other in series with a same forward direction, which clamps the inputted zero current detection signal to the ground potential and a positive power supply voltage to convert to a rectangular signal; and a pulse outputter with a comparator which compares the rectangular signal and a comparison voltage and outputs detection pulses with falling edges that are synchronized with an inductor current reaching zero.
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