首页>
外国专利>
A polor inverting detector a delay turning polor detector a bell signal detector and a constant current circuit using thereof a pulse edge detector a constant current on/off switching circuit a pulse fall edge detector a monomulti a pulse width expanding circuit a controlling voltage source circuit and a high voltage detector
A polor inverting detector a delay turning polor detector a bell signal detector and a constant current circuit using thereof a pulse edge detector a constant current on/off switching circuit a pulse fall edge detector a monomulti a pulse width expanding circuit a controlling voltage source circuit and a high voltage detector
The polarity reversal of the communication line can be detected without malfunction and the detection circuit can be integrated.;The full-wave rectification circuit 20 rectifies the voltage of the communication line and outputs a voltage of a predetermined polarity. The polarity inversion detection circuit detects the voltage increase edge between the communication lines L1 and L2 using the edge detection circuits 30A and 30B. Each of the edge detection circuits 30A and 30B is composed of a pseudo differential circuit having the same structure. For example, the edge detection circuit 30A outputs a trigger current in an end section of the rising edge. The trigger current is given to the constant current ON / OFF type holding circuit 50 through the OR circuit 40, and the constant current ON / OFF type holding circuit 50 is set to maintain and output the polarity inversion information. Reset and return to the standby state.
展开▼
