在電路設(shè)計中，數(shù)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(shí)現(xiàn)磁耦合隔離電路傳輸?shù)皖l信號的功能，用一串窄脈沖代表數(shù)字信號的狀態(tài)改變，以窄脈沖的磁隔離傳輸代替低頻數(shù)字信號的磁隔離傳輸，以上電復(fù)位電路確定磁隔離傳輸電路的初始狀態(tài)，在確定的初始狀態(tài)和信號狀態(tài)變化脈沖的共同作用下，在磁隔離電路的輸出端完整恢復(fù)需要傳輸?shù)臄?shù)字信號，從而實(shí)現(xiàn)低頻或直流信號的磁耦隔離傳輸。使用該設(shè)計可以拓展磁耦合隔離技術(shù)的應(yīng)用領(lǐng)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.