Control circuit, system, method and equipment of electronic expansion valve

Abstract

The invention relates to a control circuit, system, method and equipment of an electronic expansion valve, the control circuit comprises a controller module, a driving circuit module, a feedback circuit module and the electronic expansion valve, a driving control signal is amplified through the driving circuit module, and a driving signal of the electronic expansion valve is generated; the driving signal is used for driving the electronic expansion valve to act, and the feedback circuit module outputs a feedback signal to the controller module according to the driving signal of the electronic expansion valve, so that the controller module determines a target step number according to the feedback signal in combination with a phase signal of the electronic expansion valve and a target opening degree of the electronic expansion valve; the driving control signal is sent to the driving circuit module according to the target step number, so that the actual opening degree of the electronic expansion valve is consistent with the target opening degree, and the opening degree of the electronic expansion valve is accurately controlled; the problem that in the prior art, it cannot be guaranteed that the actual opening degree of the electronic expansion valve is consistent with the target opening degree, and consequently fine control cannot be achieved is solved.

Description

Technical Field

[0001] The present application relates to the field of air conditioning technology, and in particular to a control circuit, system, method and device for an electronic expansion valve. Background Art

[0002] The electronic expansion valve is a pressure-reducing and throttling element that can adjust the liquid supply to the evaporator according to a preset program. It is widely used in refrigeration systems, especially air-conditioning systems.

[0003] For example, in a multi-split air conditioning system, precise control of the refrigerant through an electronic expansion valve is an important part of air conditioning control and plays an important role in improving system efficiency and human comfort. However, in actual system operation, when the actual opening of the electronic expansion valve is inconsistent with the preset target opening of the electronic expansion valve, it will affect the stable operation of the system, resulting in subsequent serious consequences. Therefore, how to ensure that the actual opening of the electronic expansion valve is consistent with the target opening becomes the key. Summary of the invention

[0004] The present application provides a control circuit, system, method and device for an electronic expansion valve to solve the problem in the existing related technology that fine control cannot be achieved due to the inability to ensure that the actual opening of the electronic expansion valve is consistent with the target opening.

[0005] In a first aspect, an embodiment of the present application provides a control circuit of an electronic expansion valve, comprising: a controller module, a drive circuit module, a feedback circuit module and an electronic expansion valve;

[0006] Wherein, the driving circuit module is used to amplify the driving control signal sent by the controller module to generate a driving signal for the electronic expansion valve;

[0007] The feedback circuit module is used to output a feedback signal to the controller module according to the driving signal;

[0008] The controller module is used to determine the target number of steps based on the feedback signal, in combination with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve, and send the drive control signal according to the target number of steps.

[0009] Optionally, the number of the electronic expansion valves is greater than one, and the feedback circuit module includes feedback detection branches connected to the electronic expansion valves in a one-to-one correspondence, and the detection end of each feedback detection branch is electrically connected to the drive control end of the electronic expansion valve to which it is connected, and the feedback output end of each feedback detection branch is electrically connected to the feedback input end of the controller module, the drive control end is used to receive the drive signal, and the feedback output end is used to output the feedback signal.

[0010] Optionally, each feedback detection branch includes a first resistor, a second resistor, a third resistor, a first capacitor and a transistor;

[0011] The first end of the first resistor is electrically connected to the drive control end of the electronic expansion valve to which it is connected, the second end of the first resistor, the first end of the first capacitor, the first end of the second resistor and the base of the transistor are electrically connected, the first pole of the transistor, the second end of the third resistor and the feedback input end of the controller module are electrically connected, the first end of the third resistor is electrically connected to the power signal end of the feedback detection branch, and the second pole of the transistor, the second end of the first capacitor, the first end of the second resistor and the reference ground of the control circuit are electrically connected.

[0012] Optionally, each feedback detection branch further comprises a second capacitor;

[0013] The first end of the second capacitor, the first electrode of the transistor, the second end of the third resistor and the feedback input end of the controller module are electrically connected, and the second end of the second capacitor is electrically connected to the reference ground.

[0014] Optionally, the control circuit further includes a power conversion circuit module;

[0015] The power conversion circuit module is used to perform voltage conversion according to the power signal of the control circuit and output an operating voltage signal, and the operating voltage signal is used to power the controller module, the drive circuit module and the feedback circuit module.

[0016] In a second aspect, an embodiment of the present application provides a control system for an electronic expansion valve, wherein the control system includes the control circuit of the electronic expansion valve as described in any one of the first aspects of the present application.

[0017] In a third aspect, an embodiment of the present application provides a control method for an electronic expansion valve, which is applied to a control system of an electronic expansion valve as described in any one of the second aspects of the present application, and the control method includes:

[0018] Output a feedback signal according to the driving signal of the electronic expansion valve;

[0019] Determining a target number of steps according to the feedback signal, in combination with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve;

[0020] A driving control signal is sent according to the target number of steps, and the driving control signal is used to generate the driving signal.

[0021] Optionally, determining the target number of steps based on the feedback signal in combination with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve includes:

[0022] Determining signal feedback data using the feedback signal;

[0023] Using the phase number of the electronic expansion valve to determine the actual data of the phase number;

[0024] Calculating according to the feedback data and the actual phase number data in combination with the target opening of the electronic expansion valve to obtain the actual opening of the electronic expansion valve;

[0025] The target number of steps is determined according to a difference between the actual opening and the target opening.

[0026] Optionally, the calculation based on the feedback data and the actual phase number data in combination with the target opening of the electronic expansion valve to obtain the actual opening of the electronic expansion valve includes:

[0027] Compare the feedback data with the actual data of the phase number to obtain a comparison data difference;

[0028] An actual opening degree calculation is performed based on the comparison data difference and the target opening degree to obtain the actual opening degree.

[0029] Optionally, determining the target number of steps according to a difference between the actual opening and the target opening of the electronic expansion valve includes:

[0030] Comparing the actual opening with the target opening of the electronic expansion valve to obtain the difference;

[0031] If the difference reaches a preset opening difference threshold, the preset number of steps corresponding to the target opening is adjusted according to the difference to obtain the target number of steps.

[0032] In a fourth aspect, an embodiment of the present application provides an air-conditioning device, wherein the air-conditioning device includes a control system of an electronic expansion valve as described in any one of the second aspects of the present application.

[0033] In summary, the control circuit, system, method and equipment of the electronic expansion valve provided in the embodiments of the present application amplify the drive control signal through the drive circuit module to generate a drive signal of the electronic expansion valve, so as to drive the electronic expansion valve to operate through the drive signal, and output a feedback signal to the controller module through the feedback circuit module according to the drive signal of the electronic expansion valve, so that the controller module can determine the target number of steps based on the feedback signal, combined with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve, so as to send the drive control signal to the drive circuit module according to the target number of steps, realize fine control, ensure that the actual opening of the electronic expansion valve is consistent with the target opening, thereby realizing precise control of the opening of the electronic expansion valve, and can ensure that the flow of refrigerant in the system is perfectly matched with the demand, realize fine control of the refrigerant, and then can effectively improve the energy utilization efficiency of the air-conditioning system and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0036] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0037] Figure 1 A structural block diagram of a control circuit of an electronic expansion valve provided in an embodiment of the present application;

[0038] Figure 2 A circuit schematic diagram of a feedback circuit module connected to a drive circuit module and an electronic expansion valve provided in an example of the present application;

[0039] Figure 3 A structural block diagram of a control circuit of an electronic expansion valve provided in an optional embodiment of the present application;

[0040] Figure 4 A schematic diagram of the structure of a control system of an electronic expansion valve provided as an example of the present application;

[0041] Figure 5 A structural block diagram of a control system of an electronic expansion valve is provided for an embodiment of the present application;

[0042] Figure 6 A schematic diagram of the structure of an air conditioning device provided in an embodiment of the present application;

[0043] Figure 7 A schematic flow chart of the steps of a method for controlling an electronic expansion valve is provided for an embodiment of the present application;

[0044] Figure 8 A schematic flow chart of the steps of a method for controlling an electronic expansion valve provided as an example of the present application.

[0045] Among them, 110 is a controller module, 120 is a drive circuit module, 130 is a feedback circuit module, 140 is an electronic expansion valve, 210 is a feedback detection branch, I00 is a first drive control signal, I01 is a second drive control signal, I02 is a third drive control signal, I03 is a fourth drive control signal, FB0 is a first feedback signal, FB1 is a second feedback signal, FB2 is a third feedback signal, FB3 is a fourth feedback signal, R1 is a first resistor, R2 is a second resistor, R3 is a third resistor, C1 is a first capacitor, C2 is a second capacitor, Q is a transistor, Vcc is a power signal terminal, 310 is a power conversion circuit module, 500 is a control system, 510 is a control circuit, and 600 is air-conditioning equipment. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0047] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0048] In order to solve the problem in the existing related technology that fine control cannot be achieved due to the inability to ensure that the actual opening of the electronic expansion valve is consistent with the target opening, the embodiment of the present application provides a control circuit, system, method and device for an electronic expansion valve, which amplifies the drive control signal through a drive circuit module to generate a drive signal for the electronic expansion valve, so as to drive the electronic expansion valve to operate through the drive signal, and outputs a feedback signal to a controller module based on the drive signal of the electronic expansion valve through a feedback circuit module, so that the controller module can determine the target number of steps based on the feedback signal, combined with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve, so as to send the drive control signal to the drive circuit module according to the target number of steps, thereby ensuring that the actual opening of the electronic expansion valve is consistent with the target opening, achieving precise control of the opening of the electronic expansion valve, ensuring that the flow of refrigerant in the system perfectly matches the demand, and thus achieving fine control of the refrigerant, effectively improving the energy utilization efficiency of the air-conditioning system, and reducing energy consumption.

[0049] Figure 1 This is a structural block diagram of a control circuit of an electronic expansion valve provided in an embodiment of the present application. Figure 1 As shown, the control circuit of the electronic expansion valve provided in the embodiment of the present application includes: a controller module 110, a drive circuit module 120, a feedback circuit module 130 and an electronic expansion valve 140; wherein the drive circuit module 120 is used to amplify the drive control signal sent by the controller module 110 to generate a drive signal for the electronic expansion valve; the feedback circuit module 130 is used to output a feedback signal to the controller module 110 based on the drive signal; the controller module 110 is used to determine the target number of steps based on the feedback signal, combined with the phase number of the electronic expansion valve 140 and the target opening of the electronic expansion valve 140, and send the drive control signal according to the target number of steps.

[0050] In the embodiment of the present application, the driving signal can drive the electronic expansion valve 140 to operate, and can be specifically used to control the opening of the electronic expansion valve 140 , such as being used to control the actual opening of the electronic expansion valve 140 . Specifically, the control circuit of the electronic expansion valve provided in the embodiment of the present application amplifies the drive control signal sent by the controller module 110 through the drive circuit module 120 to generate a drive signal for the electronic expansion valve based on the amplified signal. For example, the drive circuit module 120 can amplify the drive control signal to a level signal sufficient to drive the electronic expansion valve 140, and transmit it to the electronic expansion valve 140 as a drive signal to drive the resistor to act, and can detect the drive signal through the feedback circuit module 130 to output a feedback signal to the controller module 110 based on the drive signal, so that the controller module 110 can determine the target number of steps based on the feedback signal, combined with the phase number of the electronic expansion valve 140 and the target opening of the electronic expansion valve 140, so as to send the drive control signal to the drive circuit module 120 according to the target number of steps, so as to achieve fine control, thereby ensuring that the actual opening of the electronic expansion valve 140 is consistent with the target opening, achieving precise control of the opening of the electronic expansion valve 140, and solving the problem of being unable to achieve fine control in the existing related technology due to the inability to ensure that the actual opening of the electronic expansion valve 140 is consistent with the target opening.

[0051] For example, in order to improve human comfort, the opening of the electronic expansion valve 140 can be precisely controlled so that the refrigerant in the air-conditioning system can be finely controlled according to the established opening, ensuring that the flow of the refrigerant in the system perfectly matches the demand, avoiding excessive or insufficient refrigerant flow, thereby improving the energy efficiency of the air-conditioning system. Precise refrigerant control can make the air-conditioning system more stable, avoid temperature fluctuations, and provide air-conditioning users with a more comfortable living or working environment.

[0052] In a specific implementation, the opening degree of the electronic expansion valve 140 determines the flow rate thereof. Therefore, in some optional embodiments of the present application, one or more electronic expansion valves 140 may be used to control the flow rate of the refrigerant in the air-conditioning system.

[0053] Optionally, the control circuit of the electronic expansion valve provided in the embodiment of the present application may include one or more resistance expansion valves, which is not limited in the embodiment of the present application.

[0054] Specifically, when the number of the electronic expansion valves 140 is greater than one, the feedback circuit module 130 in the embodiment of the present application may include feedback detection branches connected to the electronic expansion valves 140 in a one-to-one correspondence, and the detection end of each feedback detection branch is electrically connected to the drive control end of the electronic expansion valve 140 to which it is connected, so as to detect the drive signal of the electronic expansion valve to which it is connected through the detection end of the feedback detection branch, so that the feedback detection branch can output a corresponding feedback signal based on the detected drive signal, and the feedback output end of each feedback detection branch is electrically connected to the feedback input end of the controller module 110, so that the feedback detection branch can output the feedback signal to the control module through the feedback output end, and then the controller module 110 can determine the actual opening of the electronic expansion valve 140 according to the feedback signal, so as to realize the precise control of the opening of the resistance expansion valve based on the actual opening of the electronic expansion valve 140. Wherein, the drive control end is used to receive the drive signal, and the feedback output end is used to output the feedback signal.

[0055] In some optional embodiments of the present application, the feedback circuit module 130 can form a feedback detection branch connected to the electronic expansion valve 140 in a one-to-one correspondence through resistors, capacitors, and transistors, so as to detect the drive signal of the electronic expansion valve to which it is connected through the feedback detection branch, so that the feedback detection branch can output a corresponding feedback signal to the controller module 110 based on the detected drive signal.

[0056] Specifically, the detection end of each feedback detection branch in the embodiment of the present application is electrically connected to the drive control end of the electronic expansion valve 140 to which it is connected, so that each feedback detection branch can detect the drive signal of the electronic expansion valve to which it is connected, and the feedback output end of each feedback detection branch is electrically connected to the feedback input end of the controller module 110, so that each feedback detection branch can input a feedback signal to the feedback input end of the controller module 110 through the output section. Among them, the drive control end of the electronic expansion valve 140 is used to receive the drive signal of the electronic expansion valve, and the feedback output end of the feedback detection branch is used to output the feedback signal.

[0057] As an example of the present application, when four electronic expansion valves 140 are driven by the driving circuit module 120, four driving control signals can be sent to the driving circuit module 120 by the controller module 110, which are a first driving control signal I00, a second driving control signal I01, a third driving control signal I02, and a fourth driving control signal I03, such as Figure 2As shown, the four driving control signals can then be amplified by the driving circuit module 120 to output the amplified signals as the driving signals of the electronic expansion valve. For example, when the four driving control signals are low-level control signals, the low-level control signals can be amplified by the driving circuit module 120 to be high-level signals sufficient to drive the electronic expansion valve 140, so as to drive the electronic expansion valve 140 to operate. At the same time, the driving signals of the electronic expansion valves connected to the respective feedback detection branches 210 can be detected by the four feedback detection branches 210 included in the feedback circuit module 130, so that the four feedback detection branches 210 can output corresponding feedback signals based on the detected driving signals, which are respectively the first feedback signal FB0, the second feedback signal FB1, the third feedback signal FB2, and the fourth feedback signal FB3. Then, the first feedback signal FB0, the second feedback signal FB1, the third feedback signal FB2, and the fourth feedback signal FB3 can be transmitted to the controller module 110, so that the levels of the four feedback signals can be detected by the controller module 110 to calculate the actual openings of the four electronic expansion valves 140.

[0058] The first feedback signal FB0 is a feedback signal output by the first feedback detection branch 210 in the feedback circuit module 130, which can be specifically used to calculate the opening of the first electronic expansion valve connected to the first feedback detection branch 210 for detection, and the opening of the first electronic expansion valve can be controlled by the first drive control signal I00; the second feedback signal FB1 is a feedback signal output by the second feedback detection branch 210 in the feedback circuit module 130, which can be specifically used to calculate the opening of the second electronic expansion valve connected to the second feedback detection branch 210 for detection, and the opening of the second electronic expansion valve can be controlled by the second drive control signal I 01 to control; the third feedback signal FB2 is the feedback signal output by the third feedback detection branch in the feedback circuit module 130, which can be used to calculate the opening of the third electronic expansion valve connected to the third feedback detection branch, and the opening of the third electronic expansion valve can be controlled by the third drive control signal I02; the fourth feedback signal FB3 is the feedback signal output by the fourth feedback detection branch in the feedback circuit module 130, which can be used to calculate the opening of the fourth electronic expansion valve connected to the fourth feedback detection branch 210, and the opening of the fourth electronic expansion valve can be controlled by the third drive control signal I03.

[0059] It should be noted that the number of feedback detection branches 210 included in the feedback circuit module 130 can be 4, or it can be any other number. For example, the feedback circuit module 130 can include 1 or N feedback detection branches 210, where n is an integer greater than one, and the embodiments of the present application do not impose any restrictions on this.

[0060] In some embodiments of the present application, each feedback detection branch 210 may include a first resistor R1, a second resistor R2, a third resistor R3, a first capacitor C1 and a transistor Q; Figure 2 As shown, the first end of the first resistor R1 is electrically connected to the driving control end of the electronic expansion valve 140 connected thereto, the second end of the first resistor R1, the first end of the first capacitor C1, the first end of the second resistor R2 and the base of the transistor Q are electrically connected, the first electrode of the transistor Q, the second end of the third resistor R3 and the feedback input end of the controller module 110 are electrically connected, the first end of the third resistor R3 is electrically connected to the power signal end Vcc of the feedback detection branch 210, the second electrode of the transistor Q, the second end of the first capacitor C1, the first end of the second resistor R2 and the reference ground of the control circuit are electrically connected, so that the conduction of the transistor Q can be controlled by the driving signal of the electronic expansion valve, and the feedback signal is obtained and output to the controller module 110, so that the feedback signal is detected by the controller module 110, so that the actual opening of the electronic expansion valve 140 can be calculated based on the feedback signal.

[0061] Of course, the feedback detection branch 210 in the embodiment of the present application may include not only the first resistor, the second resistor R2, the third resistor R3, the first capacitor C1 and the transistor Q, but also other circuit components, such as the second capacitor C2, etc., and the embodiment of the present application does not limit this.

[0062] In some optional embodiments of the present application, each feedback detection branch 210 also includes a second capacitor C2; the first end of the second capacitor C2, the first pole of the transistor Q, the second end of the third resistor R3 and the feedback input end of the controller module 110 are electrically connected, and the second end of the second capacitor C2 is electrically connected to the reference ground, so that the second capacitor C2 can be used for voltage stabilization and filtering to ensure the accuracy of the detection feedback.

[0063] In summary, the control circuit of the electronic expansion valve provided in the embodiment of the present application includes: a controller module 110, a drive circuit module 120, a feedback circuit module 130 and an electronic expansion valve 140. The drive control signal is amplified by the drive circuit module 120 to generate a drive signal for the electronic expansion valve, and the feedback circuit module 130 outputs a feedback signal to the controller module 110 based on the drive signal of the electronic expansion valve, so that the controller module 110 can determine the target number of steps based on the feedback signal, combined with the phase number of the electronic expansion valve 140 and the target opening of the electronic expansion valve 140, so as to send the drive control signal to the drive circuit module 120 according to the target number of steps, so as to achieve fine control, thereby ensuring that the actual opening of the electronic expansion valve 140 is consistent with the target opening, and achieving precise control of the opening of the electronic expansion valve 140, thereby solving the problem of being unable to achieve fine control in the prior art due to the inability to ensure that the actual opening of the electronic expansion valve 140 is consistent with the target opening.

[0064] Of course, the control circuit of the electronic expansion valve in the embodiment of the present application may include not only the controller module 110, the drive circuit module 120, the feedback circuit module 130 and the electronic expansion valve 140, but also other circuit modules, such as a power conversion circuit module, etc., and the embodiment of the present application does not limit this.

[0065] Optionally, based on the above embodiment, the control circuit of the electronic expansion valve provided in the embodiment of the present application further includes a power conversion circuit module 310, such as Figure 3 As shown; the power conversion circuit module 310 is used to perform voltage conversion according to the power signal of the control circuit, and output a working voltage signal, so as to power the controller module 110, the drive circuit module 120 and the feedback circuit module 130 through the working voltage signal. Among them, the working voltage signal is used to power the controller module 110, the drive circuit module 120 and the feedback circuit module 130, so as to provide the controller module 110, the drive circuit module 120 and the feedback circuit module 130 with working voltage, so as to ensure that the controller module 110, the drive circuit module 120 and the feedback circuit module 130 can work normally.

[0066] In an optional embodiment of the present application, the controller module 110 may include a controller, which serves as a control center and is responsible for processing data and generating control instructions. Specifically, the controller may be used to receive signals such as external temperature and humidity, and may calculate the target opening of the electronic expansion valve 140 that needs to be controlled based on these received signals and preset operating parameters. The controller may also include an algorithm module for receiving a feedback signal from the feedback circuit module 130. Based on the feedback signal, the actual opening of the electronic expansion valve 140 may be calculated through a certain algorithm, thereby accurately controlling the opening of the electronic expansion valve 140 and further accurately controlling the refrigerant flow.

[0067] The controller included in the controller module 110 may be a microcontroller (Micro Controller Unit, MCU) or other types of controllers, and the embodiment of the present application does not impose any specific limitation on this.

[0068] As an example of the present application, the control circuit of the electronic expansion valve can be applied to the control system of the electronic expansion valve, such as Figure 4 As shown, the control system can be composed of main parts such as a microcontroller (MicroController Unit, MCU), a power conversion circuit, a feedback circuit, a drive circuit, an electronic expansion valve, etc., and the microcontroller, as the control center of the system, is responsible for processing data and generating control instructions, so that the control system can obtain a feedback signal through the feedback circuit and output it to the microcontroller, and the level of the feedback signal is detected by the microcontroller to calculate the actual opening of the electronic expansion valve, so as to determine the target number of steps based on the difference between the actual opening and the target opening of the electronic expansion valve, and send a drive control signal to the drive circuit module 120 according to the target number of steps, so that the drive circuit module 120 as a drive circuit can amplify the drive control signal according to the drive control signal to generate the drive signal of the electronic expansion valve, which is used to drive the electronic expansion valve to operate, thereby realizing precise control of the opening of the electronic expansion valve.

[0069] like Figure 5 As shown, an embodiment of the present application provides a control system 500 for an electronic expansion valve, the control system 500 includes a control circuit 510 for the electronic expansion valve, and the control circuit 510 for the electronic expansion valve may be the control circuit of the electronic expansion valve described in any of the above embodiments of the present application.

[0070] In a specific implementation, the power conversion circuit module can be used as a power conversion circuit of a control system, and can be specifically used to convert the original power supply voltage into an operating voltage suitable for a microcontroller and other electronic devices, so as to provide an operating voltage signal for the microcontroller and other electronic devices, realize power supply, and ensure that the microcontroller and other electronic devices can work normally.

[0071] The drive circuit module 120 can serve as a drive circuit of the control system. The drive circuit can amplify the drive control signal sent by the controller module 110, and output the amplified signal to the electronic expansion valve as the drive signal of the electronic expansion valve. For example, when the drive control signal sent by the controller module 110 is a low-level control signal sent by a microcontroller, the drive circuit can amplify the low-level control signal sent by the microcontroller into a high-level signal sufficient to drive the electronic expansion valve, and use it as the drive signal of the electronic expansion valve to drive the electronic expansion valve to operate.

[0072] The feedback circuit module 130 can serve as a feedback circuit of the control system. The feedback circuit can be composed of a transistor, a resistor and a capacitor, and can control the conduction of the transistor by the level of the electronic expansion valve control port to obtain a feedback voltage, so as to generate a feedback signal based on the feedback voltage and output it to the microcontroller, so that the feedback signal can be detected by the microcontroller, and the feedback level can be detected based on the level of the feedback signal, and the feedback level is used to calculate the actual opening of the electronic expansion valve.

[0073] The control end of the electronic expansion valve can receive a signal, such as a drive signal of the electronic expansion valve can be received through the control end. The drive signal can be a signal generated by the drive circuit module 120 amplifying the drive control signal sent by the microcontroller, so that the electronic expansion valve can receive the signal from the microcontroller to control the opening of the electronic expansion valve according to the drive signal.

[0074] In some optional implementations of the present application, the electronic expansion valve can be used to control the flow of refrigerant in the air-conditioning equipment, so that the air-conditioning equipment can ensure that the flow of refrigerant in the system perfectly matches the demand by precisely controlling the opening of the electronic expansion valve, thereby avoiding excessive or insufficient refrigerant flow, and achieving precise control of the refrigerant flow, thereby improving air-conditioning operating efficiency and human comfort.

[0075] like Figure 6As shown, an embodiment of the present application provides an air-conditioning device 600, which includes a control system 500 for an electronic expansion valve. The control system 500 may be the control system described in any embodiment of the present application, so that the air-conditioning device 600 can amplify the drive control signal through the drive circuit module 120 to generate a drive signal for the electronic expansion valve, and output a feedback signal through the feedback circuit module 130 based on the drive signal of the electronic expansion valve, so as to determine the target number of steps based on the feedback signal, in combination with the phase number of the electronic expansion valve 140 and the target opening of the electronic expansion valve, so that the drive control signal can be sent to the drive circuit module 120 according to the target number of steps, so as to ensure that the actual opening of the electronic expansion valve is consistent with the target opening, thereby realizing precise control of the opening of the electronic expansion valve, and then ensuring that the flow of the refrigerant in the system is perfectly matched with the demand, realizing fine control of the refrigerant, making the air-conditioning system more stable, avoiding temperature fluctuations, providing a more comfortable living or working environment, and being able to effectively improve the energy utilization efficiency of the air-conditioning system and reduce energy consumption.

[0076] like Figure 7 As shown, the present application embodiment provides a schematic flow chart of the steps of a control method for an electronic expansion valve. In a specific implementation, the control method for an electronic expansion valve provided in the present application embodiment can be applied to the control circuit of the electronic expansion valve described in any of the above embodiments of the present application, and can be specifically applied to the control system described in the above embodiments, such as Figure 7 As shown, the control method may specifically include the following steps:

[0077] Step 710, outputting a feedback signal according to the driving signal of the electronic expansion valve;

[0078] Step 720, determining a target number of steps according to the feedback signal, in combination with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve;

[0079] Step 730: Send a drive control signal according to the target number of steps, wherein the drive control signal is used to generate the drive signal.

[0080] It can be seen that the control method of the electronic expansion valve provided in the embodiment of the present application outputs a feedback signal based on the drive signal of the electronic expansion valve, and determines the target number of steps based on the feedback signal in combination with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve, so that the drive control signal can be sent according to the target number of steps to achieve fine control, thereby ensuring that the actual opening of the electronic expansion valve is consistent with the target opening, and solving the problem of being unable to achieve fine control in the existing related technology due to the inability to ensure that the actual opening of the electronic expansion valve is consistent with the target opening.

[0081] In a specific implementation, after obtaining the feedback signal, the embodiment of the present application can calculate based on the feedback signal through a pre-set algorithm to calculate the actual opening of the electronic expansion valve based on the feedback signal, thereby comparing the target opening of the current electronic expansion valve with the actual opening, and driving the target number of steps of the electronic expansion valve based on the comparison result, and then it can operate according to the target number of steps, output a drive signal according to the target number of steps, control the opening of the electronic expansion valve, and achieve precise control of the opening of the electronic expansion valve. Optionally, the embodiment of the present application determines the target number of steps based on the feedback signal, combined with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve, and can specifically include the following sub-steps:

[0082] Sub-step S11, using the feedback signal to determine signal feedback data;

[0083] Sub-step S12, using the phase number of the electronic expansion valve to determine the actual data of the phase number;

[0084] Sub-step S13, calculating according to the feedback data and the actual phase number data in combination with the target opening of the electronic expansion valve to obtain the actual opening of the electronic expansion valve;

[0085] Sub-step S14, determining the target number of steps according to the difference between the actual opening and the target opening.

[0086] Among them, the signal feedback data may include feedback data calculated according to the feedback signal. For example, when the feedback signal is a feedback level signal of a feedback circuit, after receiving the feedback signal of the feedback circuit, the received feedback level signals may be spliced ​​in sequence to be processed based on the spliced ​​binary data to obtain a processed feedback value F(x) as the signal feedback data.

[0087] The phase number of the electronic expansion valve is used as the phase number of the electronic expansion valve, which may specifically refer to the phase number set according to the phase and beat in the function book of the electronic expansion valve; the actual data of the phase number may include actual data calculated according to the phase number of the electronic expansion valve. For example, after obtaining the phase number of the electronic expansion valve, the phase number of the electronic expansion valve may be spliced ​​into a four-bit binary data in sequence to obtain the processed actual value R(x) as the actual data of the phase number, so that the actual opening of the electronic expansion valve may be calculated by comparing the feedback value F(x) with the processed actual value R(x). For example, when the feedback value F(x) is equal to the processed actual value R(x), it can be considered that the current target opening of the electronic expansion valve is consistent with the actual opening of the electronic expansion valve, and then the current target opening of the electronic expansion valve can be determined as the actual opening of the electronic expansion valve; if the feedback value F(x) is not equal to the processed actual value R(x), the actual opening calculation may be performed based on the difference between the feedback value F(x) and the processed actual value R(x) in combination with the target opening of the electronic expansion valve to calculate the actual opening of the current electronic expansion valve.

[0088] In some optional embodiments of the present application, the calculation based on the feedback data and the actual data of the phase number, combined with the target opening of the electronic expansion valve, to obtain the actual opening of the electronic expansion valve, may specifically include: comparing the feedback data with the actual data of the phase number to obtain a comparison data difference; performing actual opening calculation based on the comparison data difference and the target opening to obtain the actual opening. The comparison data difference refers to the data difference obtained by comparing the feedback data and the actual data of the phase number, such as the feedback data minus the actual data of the phase number, so that the difference between the feedback data and the actual data of the phase number can be determined as the comparison data difference, so that the actual opening of the electronic expansion valve can be calculated based on the comparison data difference in combination with the target opening of the electronic expansion valve.

[0089] After calculating the actual opening of the electronic expansion valve, the actual opening of the electronic expansion valve can be compared with the target opening of the electronic expansion valve to determine whether the current target opening of the electronic expansion valve is consistent with the actual opening of the electronic expansion valve; if the current target opening of the electronic expansion valve is consistent with the actual opening of the electronic expansion valve, the operation can be controlled according to the established parameters to output the drive control signal to the drive circuit according to the established number of steps, wherein the established parameters may include various pre-set operation control parameters, such as the established number of steps, which can be used to output the drive control signal for controlling the opening of the electronic expansion valve; if the current target opening of the electronic expansion valve is inconsistent with the actual opening of the electronic expansion valve, the number of steps for controlling the electronic expansion valve is adjusted according to the difference between the actual opening and the target opening of the electronic expansion valve, and the adjusted number of steps can be used as the target number of steps to output the drive control signal for controlling the opening of the electronic expansion valve according to the target number of steps, so that the opening of the electronic expansion valve can be controlled by the target number of steps, thereby achieving fine control of the opening of the electronic expansion valve.

[0090] In some optional embodiments of the present application, the target number of steps is determined based on the difference between the actual opening and the target opening of the electronic expansion valve, which may specifically include: comparing the actual opening with the target opening of the electronic expansion valve to obtain the difference; if the difference reaches a preset opening difference threshold, adjusting the preset number of steps corresponding to the target opening based on the difference to obtain the target number of steps.

[0091] The preset opening difference threshold refers to the preset maximum opening error, and the specific value can be set according to the control accuracy, which is not limited in the embodiment of the present application. The preset predetermined number of steps refers to the number of steps set in advance for the target opening, which can be used to output a drive control signal to control the opening of the electronic expansion valve.

[0092] Specifically, after determining the actual opening of the electronic expansion valve, the embodiment of the present application can compare the actual opening of the electronic expansion valve with the target opening of the electronic expansion valve to determine whether the current target opening of the electronic expansion valve is consistent with the actual opening of the electronic expansion valve based on the comparison result. Specifically, by comparing the actual opening of the electronic expansion valve with the target opening of the electronic expansion valve, the difference between the actual opening of the electronic expansion valve and the target opening of the electronic expansion valve can be obtained, and by judging whether the difference reaches a set opening difference threshold, it can be determined whether the current target opening of the electronic expansion valve is consistent with the actual opening of the electronic expansion valve; if the difference between the actual opening of the electronic expansion valve and the target opening of the electronic expansion valve is less than the preset opening difference threshold, it can be considered that the current target opening of the electronic expansion valve is consistent with the actual opening of the electronic expansion valve, and then the operation can be controlled according to a predetermined number of steps, such as outputting a control drive signal according to a predetermined number of steps, and issuing the control drive signal through the drive circuit. , output the driving signal of the electronic expansion valve to drive the electronic expansion valve to operate and realize the opening control of the electronic expansion valve; if the difference between the actual opening of the electronic expansion valve and the target opening of the electronic expansion valve is equal to or greater than the preset opening difference threshold, it can be considered that the current target opening of the electronic expansion valve is inconsistent with the actual opening of the electronic expansion valve, and then the preset set number of steps can be adjusted based on the difference, and the adjusted number of steps can be used as the target number of steps to output the control driving signal according to the target number of steps, adjust the actual opening of the electronic expansion valve, until the actual opening of the electronic expansion valve is consistent with the target opening, stop the step adjustment, and output the control driving signal according to the final target set number of steps to realize the fine control of the electronic expansion valve. Among them, the target set number of steps refers to the target number of steps determined when the actual opening of the electronic expansion valve is consistent with the target opening.

[0093] As an example of the present application, in the case where the feedback signal is a feedback level signal of a feedback circuit, after receiving the feedback level signal of the feedback circuit, the received feedback level signal can be spliced ​​in sequence. For example, in the case where the received feedback level signal includes: a first feedback signal FB0, a second feedback signal FB1, a third feedback signal FB2, and a fourth feedback signal FB3, the first feedback signal FB0, the second feedback signal FB1, the third feedback signal FB2, and the fourth feedback signal FB3 can be spliced ​​in sequence into a four-bit binary data, and output is performed based on the four-bit binary data to obtain a processed feedback value F(x), such as Figure 8As shown, step S1, obtains the processed feedback value F(x), and then the phase number of the electronic expansion valve can be spliced ​​into a four-bit binary data in sequence to obtain the processed actual value R(x), that is, step S2, obtains the processed actual value R(x), and calculates the actual opening and target opening of the electronic expansion valve by comparing the feedback value F(x) with the processed actual value R(x), that is, step S3, obtains the target opening and the actual opening. For example, when R(x) is equal to F(x), the target opening of the electronic expansion valve can be determined as the actual opening of the electronic expansion valve, and when R(x) is not equal to F(x), the actual opening can be calculated based on the difference between the feedback value F(x) and the processed actual value R(x), combined with the target opening of the electronic expansion valve, so as to calculate the actual opening of the current electronic expansion valve, and the target opening of the electronic expansion valve can be calculated based on the external temperature, humidity and other signals received by the microcontroller and the preset operating parameters, and the present application example does not limit this.

[0094] After obtaining the target opening and the actual opening, it can be determined whether adjustment is required by judging whether the target opening and the actual opening are consistent, that is, executing step S4 to judge whether the target opening and the actual opening of the electronic expansion valve are consistent; if the target opening and the actual opening of the electronic expansion valve are consistent, it can be determined that there is no need to adjust the preset set number of steps corresponding to the target opening, and the set number of steps can be used as the target step number to operate according to the set number of steps, that is, executing step S5, the system operates according to the target set number of steps, and the target set number of steps refers to the set number of steps pre-set for the target opening; if the target opening and the actual opening of the electronic expansion valve are inconsistent, the preset set number of steps corresponding to the target opening can be adjusted based on the difference between the actual opening of the electronic expansion valve and the target opening, and the adjusted number of steps can be used as the target step number to output a control drive signal to adjust the actual opening of the electronic expansion valve to the target opening, that is, executing step S6, continuing to adjust until the actual opening of the electronic expansion valve is equal to the target opening, and operating according to the target step number to accurately control the opening of the electronic expansion valve, thereby accurately controlling the refrigerant flow.

[0095] For example, after the air-conditioning multi-split system starts running, the electronic expansion valve receives a signal from the microcontroller, and the operating opening changes, so that the feedback circuit can generate a feedback signal to the microcontroller based on the level of the electronic expansion valve control port. After receiving the feedback signal from the feedback circuit, the microcontroller can calculate the actual opening of the electronic expansion valve through a certain algorithm, so as to control the electronic expansion valve based on the actual opening and the target opening, thereby being able to accurately control the opening of the electronic expansion valve and then accurately control the refrigerant flow, making the air-conditioning system more stable, avoiding temperature fluctuations, and providing a more comfortable living or working environment.

[0096] The above described system, device, and method embodiments are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0097] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiment.

[0098] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0099] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A control circuit for an electronic expansion valve, characterized in that: include: A controller module, a drive circuit module, a feedback circuit module and an electronic expansion valve; Wherein, the driving circuit module is used to amplify the driving control signal sent by the controller module to generate a driving signal for the electronic expansion valve; The feedback circuit module is used to output a feedback signal to the controller module according to the driving signal; The controller module is used to determine the target number of steps based on the feedback signal, in combination with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve, and send the drive control signal according to the target number of steps.

2. The control circuit of the electronic expansion valve according to claim 1, characterized in that: The number of the electronic expansion valves is greater than one, the feedback circuit module includes feedback detection branches connected to the electronic expansion valves in a one-to-one correspondence, and the detection end of each feedback detection branch is electrically connected to the drive control end of the electronic expansion valve to which it is connected, and the feedback output end of each feedback detection branch is electrically connected to the feedback input end of the controller module, the drive control end is used to receive the drive signal, and the feedback output end is used to output the feedback signal.

3. The control circuit of the electronic expansion valve according to claim 2, characterized in that: Each feedback detection branch includes a first resistor, a second resistor, a third resistor, a first capacitor and a triode; The first end of the first resistor is electrically connected to the drive control end of the electronic expansion valve to which it is connected, the second end of the first resistor, the first end of the first capacitor, the first end of the second resistor and the base of the transistor are electrically connected, the first pole of the transistor, the second end of the third resistor and the feedback input end of the controller module are electrically connected, the first end of the third resistor is electrically connected to the power signal end of the feedback detection branch, and the second pole of the transistor, the second end of the first capacitor, the first end of the second resistor and the reference ground of the control circuit are electrically connected.

4. The control circuit of the electronic expansion valve according to claim 3, characterized in that: Each feedback detection branch further comprises a second capacitor; The first end of the second capacitor, the first electrode of the transistor, the second end of the third resistor and the feedback input end of the controller module are electrically connected, and the second end of the second capacitor is electrically connected to the reference ground.

5. The control circuit of the electronic expansion valve according to any one of claims 1 to 4, characterized in that: The control circuit also includes a power conversion circuit module; The power conversion circuit module is used to perform voltage conversion according to the power signal of the control circuit and output an operating voltage signal, and the operating voltage signal is used to power the controller module, the drive circuit module and the feedback circuit module.

6. A control system for an electronic expansion valve, characterized in that: The control system comprises a control circuit for the electronic expansion valve as described in any one of claims 1 to 5.

7. A control method for an electronic expansion valve, characterized in that: Applied to the control system of the electronic expansion valve as claimed in claim 6, the control method comprises: Output a feedback signal according to the driving signal of the electronic expansion valve; Determining a target number of steps according to the feedback signal, in combination with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve; A driving control signal is sent according to the target number of steps, and the driving control signal is used to generate the driving signal.

8. The control method according to claim 7, characterized in that: The step of determining the target number of steps based on the feedback signal, in combination with the phase number of the electronic expansion valve and the target opening of the electronic expansion valve, comprises: Determining signal feedback data using the feedback signal; Using the phase number of the electronic expansion valve to determine the actual data of the phase number; Calculating according to the feedback data and the actual phase number data in combination with the target opening of the electronic expansion valve to obtain the actual opening of the electronic expansion valve; The target number of steps is determined according to a difference between the actual opening and the target opening.

9. The control method according to claim 8, characterized in that: The step of calculating based on the feedback data and the actual phase number data in combination with the target opening of the electronic expansion valve to obtain the actual opening of the electronic expansion valve includes: Compare the feedback data with the actual data of the phase number to obtain a comparison data difference; An actual opening degree calculation is performed based on the comparison data difference and the target opening degree to obtain the actual opening degree.

10. The control method according to claim 8, characterized in that: Determining the target number of steps according to the difference between the actual opening and the target opening of the electronic expansion valve comprises: Comparing the actual opening with the target opening of the electronic expansion valve to obtain the difference; If the difference reaches a preset opening difference threshold, the preset number of steps corresponding to the target opening is adjusted according to the difference to obtain the target number of steps.

11. An air conditioning device, characterized in that: The air conditioning device comprises the control system of the electronic expansion valve as claimed in claim 6.

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