針對目前電源充電器的安全和能源浪費的問題，提出一種可以應用于移動設備的安全并且節能的電源控制器的設計方法，重點設計了電流繼電器的電路。通過設計改進電流繼電器的電流取樣電路、電壓放大電路、精密整流電路、比較和觸發電路、繼電氣控制電路等部分電路，使電源在充電完成后斷開，從而達到節能安全的目的。實驗結果證明，電源控制器在電源充電結束后，電流減小到75 mA后斷開充電電源，比現有充電器的安全性和節能性都有較大提高。

Abstract:

?Aiming at the power chargers’ safety and energy-wasting problems， this article presents a design for supply controller which is safety and energy-saving and can apply to mobile devices. It focused on the design of current relay circuit. Through improving the design of part circuit of current relay， including current sampling circuit， voltage amplifier circuit， precision rectifier circuit， trigger circuit， control circuit and other circuits， the power will be disconnected after complete charging， which achieves the purpose of energy security. The experimental results show that， while controller disconnected the power supply after charging， the current was reduced to 75mA. It is more secure and energy efficient than existing charger.

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