在電路設計中，數字信號的隔離傳輸電路是比較常用電路之一，一般的磁耦合隔離電路只適合于傳輸高頻信號，對于低頻或直流信號則無能為力。為了實現磁耦合隔離電路傳輸低頻信號的功能，用一串窄脈沖代表數字信號的狀態改變，以窄脈沖的磁隔離傳輸代替低頻數字信號的磁隔離傳輸，以上電復位電路確定磁隔離傳輸電路的初始狀態，在確定的初始狀態和信號狀態變化脈沖的共同作用下，在磁隔離電路的輸出端完整恢復需要傳輸的數字信號，從而實現低頻或直流信號的磁耦隔離傳輸。使用該設計可以拓展磁耦合隔離技術的應用領域，降低電路功耗。

　　Abstract:

　　In the circuit design， the circuit of isolating transmission digital signal is one of the more commonly-used， the magnetic coupling isolating circuit is used in transmission the high frequency signals only， for the low frequency or DC signals， it is powerlessness. In order to transmit low frequency or DC signals， using a narrow pulse to represent the state changes of digits signal，using a power on reset circuit to determine the initial state of the magnetic coupling isolate circuit，under the initial state and narrow pulse，the digits signal is restored by the magnetic coupling isolate circuit. the magnetic coupling isolate transmission of low frequency or DC signals is implemented. Using this design， the application fields of the magnetic coupling isolation technology can be expanded and the power consume can be reduced.