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此电路制作简单,调试容易。连续使用一年多未出现故障。工作原理:电路如附图所示,当输入电压为180V时,555时基电路②脚电压低于4V,输出端③脚为高电位,继电器J吸合,触点接通升压绕组,使输出电压为240V;当输入电压上升为185V时,⑥脚电压高于8V,继电器释放,输出电压为输入电压。本电路在输入电压为145V时,输出电压为185V。电路只要安装无误,基本上不用调试。由于电阻有误
This circuit is simple, easy to debug. Continuous use for more than one year without failure. How it works: The circuit shown in the figure, when the input voltage is 180V, 555 foot-time circuit ② pin voltage is lower than 4V, the output pin ③ high potential, the relay J pull-in, the contact connected to the step-up winding so that The output voltage is 240V; when the input voltage rises to 185V, the voltage of foot ⑥ is higher than 8V, the relay is released and the output voltage is the input voltage. The circuit in the input voltage of 145V, the output voltage of 185V. Circuit as long as the installation is correct, basically do not debug. Due to the resistance is wrong