相位调制变换器是一种新型零电压转换开关变换器。它比普通的ＰＷＭ变换器有许多优点，如工作频率高、损耗小、体积小、重量轻等。采用相位调制控制器ＭＬ４８１８，可以使相位调制变换器电路更加简单，工作更加可靠。文章介绍了ＭＬ４８１８的内部结构、管脚功能和基本工作原理，还给出全桥相位调制型开关电源实际电路 Phase Modulation Converter is a new type of zero voltage switching converter. It has many advantages over ordinary PWM converters, such as high operating frequency, small loss, small size, light weight and so on. Using phase modulation controller ML4818, can make the phase modulation converter circuit more simple, more reliable work. The paper introduces the ML4818’s internal structure, pin functions and basic working principle, but also gives full-bridge phase-modulated switching power supply actual circuit