Electronic self-diagnosing circuit and magnetic field detection device

Abstract

#CMT# # / CMT# The electronic self-diagnosing circuit comprises a detection circuit and an operational amplifier, which causes amplification of the detection circuit. A multiplexer is provided, which is switched between the detection circuit and the operational amplification. A diagnosis circuit is provided, which is applied for individual generation of a diagnosis signal with high voltage and another diagnosis signal with low voltage. The diagnosis circuit is connected with the multiplexer. #CMT# : # / CMT# An independent claim is also included for a magnetic field detecting device with a magnetic sensor and a magnet. #CMT#USE : # / CMT# Electronic self-diagnosing circuit for determining normal operation of an electronic circuit. #CMT#ADVANTAGE : # / CMT# The multiplexer is switched between the detection circuit and the operational amplification, and a diagnosis circuit is provided, which is applied for individual generation of a diagnosis signal with high voltage and another diagnosis signal with low voltage, where the diagnosis circuit is connected with the multiplexer, and thus enables a simple structure of the electronic self-diagnosing circuit, and also prevents malfunctioning of the electronic circuit in an efficient and reliable manner. #CMT#DESCRIPTION OF DRAWINGS : # / CMT# The drawing shows a perspective view of a magnetic field detection device. 9 : Magnetic field detection device 10 : Magnetic sensor 11 : Printed circuit board 12 : Sensor element 14 : Magnet.

Description

technical field [0001] The present invention relates to a self-diagnostic electronic circuit capable of judging whether the electronic circuit is functioning normally. Background technique [0002] In the past, for example, in an electronic circuit having a detection circuit for magnetic field detection, in a configuration that can only obtain a magnetic field detection signal, even if a failure occurs in the electronic circuit, the microprocessor recognizes the magnetic field detection signal as a correct signal. Calculation processing is performed, resulting in a configuration with poor reliability. [0003] For example, Patent Document 1 discloses a configuration in which a channel for measuring a reference voltage of 0 volts is provided in advance among the measurement channels of a multiplexer type voltage measuring element, the reference voltage is measured, and the measurement result is compared with the reference voltage value. By comparison, it is judged whether th...

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Problems solved by technology

[0007] However, in Patent Document 2, as in Patent Document 1, only one reference voltage (divided voltage value) is used for judgment, and reliability cannot be sufficiently improved.

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