Acquisition circuit and pressure sensor classification method

Abstract

The embodiment of the invention discloses an acquisition circuit and a pressure sensor classification method, and specifically, the acquisition circuit comprises a first transmission circuit, a second transmission circuit and a type judgment circuit. During specific application, a user can connect the required pressure sensor with the first transmission circuit or the second transmission circuit according to own requirements. The type judgment circuit can receive the voltage output by the first transmission circuit or the second transmission circuit and then determine the type of the pressure sensor connected with the controller according to the voltage value; and after the pressure sensor is connected, the controller can automatically identify the type of the pressure sensor according to the voltage value, and the user does not need to select the type on a setting page, so that the use convenience of the user is improved, and the situation of abnormal system operation caused by wrong selection of the user is avoided.

Description

Technical field[0001]The present application relates to the field of automatic control technology, and more particularly to a classification method for acquisition circuits and pressure sensors.Background technique[0002]In the field of commercial refrigeration, the use of the electronic expansion valve has become a trend, and the traditional thermal expansion valve is compared, the electronic expansion valve control is more accurate, and the cooling system efficiency can be improved to achieve energy saving and emission reduction of the system. In actual work, the system requires assembly of pressure sensors, and the electronic valve controller adjusts the electronic expansion valve opening by the pressure signal collected by the pressure sensor and the temperature signal acquired by the temperature sensor to provide refrigeration efficiency.[0003]At present, the current pressure sensor is mainly divided into current pressure sensor and voltage-type pressure sensor. In order to adap...

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Problems solved by technology

[0003] At present, pressure sensors are mainly divided into current-type pressure sensors and voltage-type pressure sensors. In order to adapt to different types of pressure sensors, the electronic expansion valve controller needs to reserve different ports, and the user needs to manually set the connected pressure sensor type. Caused a lot of inconvenience, and sometimes caused abnormal system operation or reduced efficiency due to incorrect settings

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