单片机在当今的电子设备中得到大量使用，原因是其功能强大、价格低廉、应用灵活。一般来说，单片机都是数字IC，为保证其正常工作，需要直流电源设备；当要驱动交流220 V负载时，还应选择合适的执行部件并设计相应的驱动电路。直流电源设备有多种方案，常用的有（1）AC220 V直 Microcontrollers get a lot of use in today’s electronic devices due to their powerful features, low prices, and flexible applications. Generally speaking, the one-chip computers are all digital ICs, in order to guarantee its normal work, need the apparatus of direct current power; When should drive the exchange 220 V load, should also choose the appropriate executive component and design the corresponding drive circuit. There are a variety of DC power supply equipment programs, commonly used are (1) AC220 V straight