基于高功率因数程控开关电源的设计

摘要：

传统的AC／DC变换采用二极管全桥整流，输出端直接接大容量电容滤波器，造成交流电源输入电流中含有大量谐波。谐波电流对电网有严重的危害，不仅会使电网电压发生畸变，也会浪费大量的电能。随着电源绿色化概念的提出，功率因数校正得到了广泛应用。所谓功率因数校正，就是指从电路上采取措施，使交流电源输入电流实现正弦化，并与输入电压保持同相。

该系统采用TI公司专用APFC整流控制芯片UCC28019作为控制核心，构成电压外环和电流内环的双闭环控制，构建了功率因数校正（APFC）高功率因数整流电源。其中，电流内环作用是使网侧交流输入电流跟踪电网电压的波形和相位；电压外环为输出电压控制环，外环电压调节器的输出控制内环电流调节器的增益，使输出直流电压稳定。系统采用MSP430F149单片机进行监控，完成输出电压的可调及相关测量参数显示功能，以及其它外围器件实现系统功率因数、输出电压、电流的实时测量、人机交互、输出过流保护等功能。

关键词：APFC,UCC28019,过流保护,功率因数,绿色电源

Abstract:

Traditional AC / DC full-bridge rectifier diode transform the output bulk capacitor filter directly connected, causing the AC input current contains a large number of harmonics. Harmonic current of the power of serious harm, not only the power grid voltage distortion will also waste a lot of power。 With the introduction of the concept of green power, power factor correction has been widely used. The so-called power factor correction, is that from the circuit to take measures to achieve sinusoidal AC input current technology, and with the input voltage to maintain the same phase。

Our work is a high power fator commutated power with function of Active Power Factor Correction。 The special APFC commutated control PFC chip UCC28019 is the core of this system，and the regulation is accomplished loops: The inner current loop shapes the AC input current to match waveform phase of the sinusoidal AC input voltage；The outer voltage loop regulates the output DC voltage which determines the internal gain parameters for maintaining a steady steady-state output DC voltage。The MCU MSP430F149 is designed to realize adjustable output voltage and show the sensed param parameters。eters Our system also has functions unctions Over Over-current Protection, Human Human-computer Interaction,the real time sense of output voltage、current and the power factor by using A MSP430F149 and its external MSP430F149 components。

Keyword：PFC，UCC28019，Over-currentProtection,Power Factor,Green Power

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