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中文摘要：
设计了一种以UC3842为控制芯片的单端反激式光伏逆变器用多路开关电源,该电源具有9路直流输出,通过调节控制芯片输出脉冲的占空比以适应直流输入在较大范围内的变化,为光伏并网逆变器的开关器件驱动及控制电路提供稳定的直流电压。介绍并改进了电流型控制芯片UC3842的工作原理、外围电路和高频变压器的设计以及所采用的共模滤波电容和π型滤波电路等,旨在改善输出直流电压电能质量。样机试验表明,该电源输出直流电压纹波在可以接受的范围内,能够适应输入直流电压的大范围波动,为光伏逆变器长期运行可靠供电。
英文摘要：
A single flyback switching power supply is proposed for photovoltaic inverters,which adjusts the duty cycle by UC3842 controller to adapt to the DC input variation and has 9 DC outputs to provide stable voltage for the switching device and control circuit of photovoltaic inverter.The working principle of UC3842,the design of peripheral circuits and high frequency transformer,the common-mode filtering capacitor and π-type filter circuit are described and improved to maintain the output power quality.Prototype tests show that,it provides long-term reliable DC voltage with acceptable ripples and adapts to a wide fluctuation of input DC voltage.
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