电力专用在线式UPS系统设计

Design of power system dedicated-online UPS

不间断电源(UPS)是一种能提供优质电源并保证电源供应连续的电力电子装置,在电力系统中,在线式UPS的作用就是在市电和逆变输出同时正常时,优先使用逆变输出供给负载优质的交流电能。通常情况下,电力系统控制室都配备有直流屏或蓄电池组,因此电力专用UPS就利用这些蓄电池组作为其逆变器的直流输入,以减少重复投资。在系统设计中,利用单片机PIC18F2331作为控制核心,通过驱动芯片HCPL3120的隔离放大,驱动全桥逆变电路桥臂上的四个场效应管,控制逆变器输出50 Hz∕220 V正弦波电压。同时,方案中还设计了包括直流过压、直流欠压、频率捕捉、掉电检测、输出过载以及温度检测等保护电路,以绝对保证负载的用电安全。

Uninterruptible power supply（UPS） is a power electronic device which provides high quality and uninterruptible electronic power,widely used in banks,military,medical,aerospace,and etc.In the electric system of power,the action of online UPS is supplying power to load when the mains supply and inverter output are existing at the same time.In general conditions,storage battery is allocated in main control rooms of power system,with which as the input of inverter,in order to cut down the repeatability expenses.In the design of system,PIC18F2331 was used as the control core with HCPL3120 to drive four MOSFET in the full-bridge circuit.Then inverter outputted perfect voltage with the frequency of 50 Hz and the amplitude of 220 V.At the same time,the circuit of UPS included protective circuit,just as DC over-voltage,DC under-voltage,frequency acquisition,power failure,output overloading and temperature measuring,to pledge the safety utilization of electric power.