摘要在功率因数控制电路(PFC)中,输出端为了抑制纹波电压或电流,通常会使用一个大的电解电容作为输出电容。由于电解电容在电路中等效于一个串联电阻,电流流过它将产生功率损耗。这使得电容器的温度升高,电容器温度过高将很大程度的缩短电容器的使用寿命。所以,来估计电容电流的精确值是很重要的。本论文详细的分析了升压型功率因数控制电路中输出电容器的纹波电流,该纹波电流被分为两部分:低频纹波和高频纹波,并推导出其具体表达式,在计算机上进行仿真验证。 21472 毕业论文关键词:输出电容、纹波电流、低频纹波、高频纹波
Title Research of CCM Boost PFC converter
output capacitor ripple current
Abstract
In order to suppress the output of the ripple voltage or current, we usually
use a large electrolytic capacitor as the output capacitor in Power factor
control (PFC) circuit. Since the electrolytic capacitors in the circuit
equivalent to a series resistor, when the current flowing through it,
the electrolytic capacitor will lead power loss. Which makes temperature
of the capacitor rising. The capacitor temperature will shorten the life
of the capacitor to a large extent. Therefore, to estimate the exact value
of the capacitor current is very important. In this paper, we had made a
detailed analysis of the output capacitor ripple current in the boost power
factor control circuit. The ripple current is pided into two parts,
namely the low and high ripple current. And derive their specific
expression. At last we made lots of simulation and verification on
computer.
Keywords output capacitor, ripple current, low frequency components,
high frequency components
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