VOLTAGE DROP DETECTION CIRCUIT,申请号JP20000062174-传众专利搜索

VOLTAGE DROP DETECTION CIRCUIT

申请公布号：JP2001249148(A)

申请号：JP20000062174

申请日期：2000.03.07

申请公布日期：2001.09.14

申请人：

YASKAWA ELECTRIC CORP

发明人：HARA KENJI

分类号：G01R19/165;H02M3/28;(IPC1-7):G01R19/165

主分类号：G01R19/165

摘要：PROBLEM TO BE SOLVED: To reduce the number of part items of a voltage drop detection circuit. SOLUTION: The voltage drop detection circuit 24 does not have a photocoupler nor a shunt regulator but has a counter to measure the pulse width of a pulse-like voltage at an A point between a secondary coil 4 and a diode 5. A rectifying diode is inserted between the point A and the voltage drop detection circuit 24, with an anode located at the point A. The voltage at the A point is divided by resistances 23 and 24 and inputted to the voltage drop detection circuit 24. The voltage drop detection circuit 24 outputs an /NMI signal when the pulse width of the pulse-like voltage exceeds a predetermined value T0 (S).