Control system of electronic expansion valve

Abstract

The invention provides a control system of an electronic expansion valve, comprising a sensor, a human-computer interface input device, a control mainboard and a drive board. The sensor is used for sensing and collecting the external parameter and converting the parameter into electric signals input to the control system; the human-computer interface input device is used for manually inputting the external control signals to the control system; the control mainboard comprises a micro control unit and a power driving module, wherein the micro control unit is used for converting and processing the signals collected by the sensor or the external control signals input by the human-computer interface input device and outputting the first control signal to the power driving module, and the power driving module is used for outputting a second control signal; the drive board comprises a stepper motor driving module which is used for driving a stepper motor, receiving a second control signal and outputting a third control signal for controlling the action of the electronic expansion valve. As the drive board in the control system of the electronic expansion valve does not include an MCU (Micro-programmed Control Unit), the invention reduces the manufacturing cost, and avoids loss of the control information in the transmission process of signals without multiple conversions, thereby ensuring the control precision.

Description

technical field [0001] The present invention relates to a control system of an electronic expansion valve used in refrigeration equipment, more precisely, to an improved drive board circuit in the electronic control system of the electronic expansion valve. Background technique [0002] Thermal expansion valves have long been widely used in the refrigeration and air-conditioning industry for the control of superheat and refrigerant flow. However, with the requirements for high energy efficiency ratio, precise temperature control, wide operating range, and the integration of new functions such as remote control and fault diagnosis, the traditional mechanical thermal expansion valve can no longer meet the needs of industrial control. The use of electronically controlled electronic expansion valves has become an inevitable trend. Nowadays, the electronic expansion valve has been widely used in the field of refrigeration. Its role is to adjust the flow of refrigerant flowing in...

AI Technical Summary

Problems solved by technology

The above control signal has undergone two conversions during the transmission process, and the control information will be lost during the conversion process, thus affecting the control accuracy

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