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设计一个高功率因数开关前置稳压器与连续模式的L4981
消耗积分:5 |
格式:rar |
大小:552 |
2009-10-19
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Conventional AC-DC converters usually employ a
full wave rectifier bridge with a simple capacitor
filter to draw power from the AC line. This ”bulk”
capacitor must be big enough to supply the total
power during most of each half-cycle, while instantaneous
line voltage is below the DC rectified
voltage. Consequentely, the line current waveform
is a narrow pulse, and the power factor is
poor (0.5-0.6) due to the high harmonic distortion
of the current waveform.
full wave rectifier bridge with a simple capacitor
filter to draw power from the AC line. This ”bulk”
capacitor must be big enough to supply the total
power during most of each half-cycle, while instantaneous
line voltage is below the DC rectified
voltage. Consequentely, the line current waveform
is a narrow pulse, and the power factor is
poor (0.5-0.6) due to the high harmonic distortion
of the current waveform.
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