An acceleration sensor self-test circuit

Abstract

The invention belongs to the field of acceleration sensor design, in particular to an acceleration sensor self-checking circuit. The usual self-inspection circuit uses a relay switching circuit, which affects the correctness of the output signal of the acceleration sensor; during the self-inspection time, the acceleration sensor works intermittently, which affects the real-time signal output. The self-inspection circuit of the present invention includes a series-connected arithmetic circuit, a self-inspection drive circuit and a self-inspection output circuit, the arithmetic circuit collects the differential output signal of the acceleration sensor, and outputs a deviation value from a reference voltage; the self-inspection drive The forward path or the reverse path of the circuit is turned on or neither is turned on according to the deviation value; the self-test output circuit outputs a fault signal when the forward path or the negative path is turned on. It can prevent the interference signal generated when the self-test circuit is switched from interfering with the acceleration signal and affect the correctness of the output signal of the acceleration sensor; it can realize the fault monitoring of the online detection acceleration core.

Description

technical field [0001] The invention belongs to the field of acceleration sensor design, in particular to an acceleration sensor self-checking circuit. Background technique [0002] An acceleration sensor is a sensor that uses an acceleration sensitive core to convert an acceleration signal into a proportional voltage signal. In order to judge whether the acceleration sensitive core is good or not, it is usually necessary to perform a self-check on the acceleration. The traditional acceleration sensor can only check whether the output voltage is correct or not, and cannot locate whether the acceleration core is faulty or the signal processing circuit. Faulty, so the online self-test of the accelerometer cannot be performed. [0003] The usual self-inspection circuit uses a relay switching circuit to input the detection voltage into the circuit to be tested. On the one hand, the relay switching circuit will introduce interference signals, which will affect the correctness of...

AI Technical Summary

Problems solved by technology

In order to judge whether the acceleration sensitive core is good or not, it is usually necessary to perform a self-check on the acceleration. The traditional acceleration sensor can only check whether the output voltage is correct or not, and cannot locate whether the acceleration core is faulty or the signal processing circuit. Faulty, so the online self-test of the accelerometer core cannot be performed

[0003] The usual self-inspection circuit uses a relay switching circuit to input the detection voltage into the circuit to be tested. On the one hand, the relay switching circuit will introduce interference signals, which will affect the correctness of the output signal of the acceleration sensor; on the other hand, during the self-testing time, the circuit to be tested It cannot work normally, causing the acceleration sensor to work intermittently and affecting the real-time signal output

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