Zero setting circuit of sensor

Abstract

The invention discloses a zero setting circuit of a sensor. The zero setting circuit comprises a zero point acquisition module, a zero setting output module and a power supply module; the zero point acquisition module is used for acquiring zero point voltage of the sensor, the zero-point acquisition module comprises a first microprocessor, and the first microprocessor is provided with a data interface connected with a universal meter, wherein zero-point voltage data of the sensor is acquired through the universal meter and is sent to the first microprocessor, and the first microprocessor is connected with the sensor through an AD acquisition circuit; the zero setting output module is connected with the zero point acquisition module, and the zero setting output module comprises a second microprocessor, an analog switch array, a resistor array and an adder circuit which are connected in sequence, wherein the second microprocessor is in communication connection with the first microprocessor, and the adder circuit is connected with the zero setting position joint of the sensor and outputs voltage to the sensor; and the power supply module is used for supplying power to the zero point acquisition module and the zero setting output module. According to the invention, closed-loop automatic zero setting can be realized, efficiency of zero setting operation is greatly improved, and reduction of labor cost is facilitated.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a zero adjustment circuit for measuring sensors. Background technique [0002] Sensors have a wide range of applications in the field of measurement. Due to the sensor circuit design, environmental impact and other reasons, measurement sensors, such as current sensors, need to add a zero-adjustment circuit in the circuit during the design process. At present, most measuring sensors adopt the principle of potentiometer voltage division for zero adjustment. The use of potentiometers requires manual participation in all stages of the sensor production process. For example, in the production process, the zero adjustment must be manually adjusted by the worker, which not only has low production efficiency and high labor costs, but also introduces high manual errors. . Some sensors also need to be zeroed during the installation process, and the manual zeroing method will also affect...

AI Technical Summary

Problems solved by technology

The use of potentiometers requires manual participation in all stages of the sensor production process. For example, in the production process, the zero adjustment must be manually adjusted by the worker, which not only has low production efficiency and high labor costs, but also introduces high manual errors.

Some sensors also need to be zeroed during the installation process, and the manual zeroing method will also affect the installation efficiency

In addition, due to the aging of circuit components and environmental impact, during the post-maintenance process of the sensor, workers also need to re-zero on the spot, which undoubtedly increases the maintenance cost

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