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图1为笔者根据实物绘制的电源电路原理图。该机电源设计别具一格,能在110V恶劣条件下进行工作。在停电时,能用12V直流电进行工作。在该机电源电路里设置了两套稳压系统。采用变压器降压整流方式。一、电源电路工作原理接通电源,220V交流电通过继电器LY801、保险管F802与F801之后,由变压器T801降压、经由D801—D804组成的桥式整流之后,送到由Q809及外围元件组成的5V电源(备用电源)。另外,IC801(电源切换集成块)、Q810—Q813、继电器LY801及外围元件
Figure 1 for the author according to the physical drawing of the power circuit diagram. The power supply unique design of the machine, can work under 110V in harsh conditions. In the power outage, can work with 12V DC. In the machine power circuit set up two sets of voltage regulator system. Transformer step-down rectifier. First, the power circuit works Power, 220V AC through the relay LY801, fuse F802 and F801 after the transformer T801 step-down by D801-D804 composed of bridge rectifier, sent by the Q809 and the external components of the 5V Power (backup power). In addition, IC801 (power switching manifold), Q810-Q813, relay LY801 and peripheral components