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1. 发明专利

JPH06174759A VOLTAGE DETECTING CIRCUIT DEVICE 失效
公开(公告)号：JPH06174759A
公开(公告)日：1994-06-24
申请号：JP32658792
申请日：1992-12-07
申请人： TOSHIBA CORP , TOSHIBA MICRO ELECTRONICS
发明人： KURODA TADASHI , FUKUMOTO KOJI , UDAGAWA OSAMU , SUGIYAMA MARIKO
IPC分类号： G01R19/00 , G01R19/165
摘要： PURPOSE:To allow the stabilized positive detection of power supply voltage under instable state at the time of starting power supply while suppressing current consumption during steady state. CONSTITUTION:A voltage detecting circuit device receiving a voltage signal corresponding to a reference voltage at one input of a differential amplifier 3, a voltage signal corresponding to DC power supply voltage at the other input of the differential amplifier 3 and producing a voltage detection signal from the output terminal of the differential amplifier 3 comprises a constant voltage circuit 27 receiving output voltage from the DC power supply and producing a voltage signal having lower level than the voltage signal corresponding to the reference voltage within a range where output voltage of the DC power supply does not exceed the reference voltage whereas producing a constant voltage signal having substantially same level as the voltage signal corresponding to the reference voltage in the range where output voltage of the DC power supply exceeds the reference voltage. Output signal from the constant voltage circuit 27 is fed, as a voltage signal corresponding to the output signal of the DC power supply, to the differential amplifier 3.

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