| 摘要 |
PURPOSE:To reduce effects of a leak current by providing an offset compensation circuit for comparing an output of a sensor in a bridge constitution for detecting an inclination of a vehicle through a differential amplifier with a constant value, and integrating a differential output to be a reference voltage for the differential amplifier. CONSTITUTION:An output of an inclination sensor in a bridge constitution is amplified by a differential amplifier 13, and a differential amplifier output A is further amplified by an amplifier 31 at an alarming means 30, so an alarm 33 is driven when an amplified output exceeds a threshold value of a comparator 32. An offset compensation circuit 40 is provided between the differential amplifier 13 and the AC amplifier 31 for keeping the output A at a constant value Vref, and only a changed part of an inclination angle is transmitted to the AC amplifier 31. This compensation circuit 40 uses a comparator A4 for determining a difference between an output of the differential amplifier and the constant value Vref, and a differential output is taken for a reference voltage of an initial stage A1 of the differential amplifier 13. A switching means S1 is put on/off intermittently, so the amplified output A is supplied to the compensation circuit 40 intermittently. |
