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传统整流电路的电流畸变会导致低功率因数。各国的工业标准对电流失真而造成的低功率因数做出了严格的规定。随着笔记本电脑和LCD电视的性能的提高,其功耗也相应的增加,而其对功率因数的要求也不可避免。本文讨论的电路板是专门设计的低成本高性能功率因数校正(PFC)电路。该电路采用的控制器芯片TDA4863-2是一种用于控制宽输入电压有源PFC转换器的8管脚集成电路。这种IC以控制峰值电流的不连续模式(DCM)工作。TDA4863-2通过控制升压型转换器,使得从单相交流电网中流出电流为正弦,并输出稳定的直流电压。这种电路的工作就像是一个谐波滤波器,抑制常规整流电路中的电容器的脉冲充电电流产生的谐波电流。所获得的功率因数几乎为1。为了提高效率,采用第三代CooIMOS作为电力开关,它具有最低的单位面积导通电阻。
The current distortion of conventional rectifier circuits leads to low power factor. Industrial standards in various countries make strict rules on the low power factor caused by current distortion. As the performance of laptop computers and LCD TVs increases, their power consumption also increases correspondingly, and their power factor requirements are inevitable. The circuit board discussed in this article is a specially designed low-cost, high-performance power factor correction (PFC) circuit. The controller chip used in this circuit, the TDA4863-2, is an 8-pin integrated circuit used to control wide input voltage active PFC converters. This IC operates in discontinuous mode (DCM) that controls the peak current. By controlling the step-up converter, the TDA4863-2 makes the current drawn from the single-phase AC network sinusoidal and outputs a stable DC voltage. This circuit works like a harmonic filter that suppresses the harmonic currents generated by the pulsed charging current of a capacitor in a conventional rectifier circuit. The resulting power factor is almost 1. In order to improve efficiency, the third generation of CooIMOS is used as a power switch, which has the lowest on-resistance per unit area.