High-precision stepping electronic expansion valve control method and system
An electronic expansion valve and control method technology, applied in the field of intelligent interaction, can solve the problems of special drive chips not suitable for four-phase electronic expansion valves, high cost of drive chips, and many resources of the main controller chip, so as to reduce the failure of suction pressure risk, precise control, and the effects of improved regulatory precision
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[0042] The present invention is further described in conjunction with the following application scenarios.
[0043] In this embodiment, the microcontroller (MCU) is used as the main control module to control the four-phase eight-shot straight step toward electronic expansion valve, providing a step-by-step electronic expansion valve driving circuit, such as figure 1 As shown, in which the step-by-optical expansion valve drive circuit includes a microcontroller (U1), a power supply chip (U2), the RS485 communication chip (U3), and a composite triode chip (U4). The microcontroller (MCU) is a central processor (master module) of the control circuit, implements the control function of RS485 communication and electronic expansion valve by embedded software. The power supply chip converts the external 12V voltage to 3.3V voltage, providing power to microcontrollers and RS485 communication chips. The role of the RS485 communication chip is to communicate with the main controller of the r...
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