Control circuit, system, method, and apparatus for an electronic expansion valve

Abstract

The application relates to a control circuit, system, method and device of an electronic expansion valve, which comprises a controller module, a driving circuit module, a feedback circuit module and an electronic expansion valve. The driving control signal is amplified through the driving circuit module to generate a driving signal of the electronic expansion valve, the electronic expansion valve is driven to act through the driving signal, 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, the signal of the electronic expansion valve and the target opening degree of the electronic expansion valve, and 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, accurate control of the opening degree of the electronic expansion valve is realized, and the problem that fine control cannot be realized due to the fact that the actual opening degree of the electronic expansion valve cannot be consistent with the target opening degree in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a control circuit, system, method and device of an electronic expansion valve. BACKGROUND

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

[0003] For example, in a multi-split air conditioning system, fine control of 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 degree of the electronic expansion valve is inconsistent with the target opening degree corresponding to the electronic expansion valve, it will affect the stable operation of the system, thereby causing serious consequences. Therefore, how to ensure that the actual opening degree of the electronic expansion valve is consistent with the target opening degree has become a key issue. SUMMARY

[0004] The present application provides a control circuit, system, method and device of an electronic expansion valve to solve the problem of being unable to achieve fine control due to the inability to ensure that the actual opening degree of the electronic expansion valve is consistent with the target opening degree in the prior art.

[0005] In a first aspect, the embodiments of the present application provide 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] The drive circuit module is configured to amplify the drive control signal sent by the controller module to generate a drive signal of the electronic expansion valve.

[0007] The feedback circuit module is configured to output a feedback signal to the controller module according to the drive signal.

[0008] The controller module is configured to determine a target step number according to the feedback signal, in combination with a signal of the electronic expansion valve and a target opening degree of the electronic expansion valve, and send the drive control signal according to the target step number.

[0009] Optionally, the number of electronic expansion valves is greater than one, the feedback circuit module comprises a feedback detection branch connected to each electronic expansion valve in one-to-one correspondence, the detection end of each feedback detection branch is electrically connected to the drive control end of the electronic expansion valve connected thereto, 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 configured to receive the drive signal, and the feedback output end is configured to output the feedback signal.

[0010] Optionally, each feedback detection branch comprises 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 connected thereto, 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, 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 pole 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 comprises a power conversion circuit module.

[0015] The power conversion circuit module is configured to perform voltage conversion according to a power signal of the control circuit, and output a working voltage signal, wherein the working voltage signal is used to supply power to 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 of an electronic expansion valve, wherein the control system comprises the control circuit of the electronic expansion valve according to any one of the first aspect of the present application.

[0017] In a third aspect, an embodiment of the present application provides a control method of an electronic expansion valve, which is applied to the control system of the electronic expansion valve according to any one of the second aspect of the present application, and the control method comprises the following steps.

[0018] According to a drive signal of the electronic expansion valve, a feedback signal is outputted;

[0019] According to the feedback signal, a target step number is determined in combination with a signal of the electronic expansion valve and a target opening degree of the electronic expansion valve.

[0020] A drive control signal is sent according to the target step number, and the drive control signal is used to generate the drive signal.

[0021] Optionally, the step of determining the target step number according to the feedback signal in combination with the signal of the electronic expansion valve and the target opening degree of the electronic expansion valve comprises the following steps.

[0022] determining signal feedback data by using the feedback signal;

[0023] determining phase number actual data by using the signal of the electronic expansion valve;

[0024] calculating an actual opening degree of the electronic expansion valve according to the feedback data and the phase number actual data in combination with a target opening degree of the electronic expansion valve;

[0025] determining the target step number according to a difference between the actual opening degree and the target opening degree.

[0026] Optionally, the calculating the actual opening degree of the electronic expansion valve according to the feedback data and the phase number actual data in combination with the target opening degree of the electronic expansion valve comprises:

[0027] comparing the feedback data and the phase number actual data to obtain comparison data difference;

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

[0029] Optionally, the determining the target step number according to the difference between the actual opening degree and the target opening degree of the electronic expansion valve comprises:

[0030] comparing the actual opening degree and the target opening degree of the electronic expansion valve to obtain the difference;

[0031] if the difference reaches a preset opening degree difference threshold, adjusting a preset determined step number corresponding to the target opening degree according to the difference to obtain the target step number.

[0032] In a fourth aspect, an air conditioning device is provided, which comprises the control system of the electronic expansion valve according to any one of the second aspect.

[0033] To sum up, the control circuit, system, method and equipment of the electronic expansion valve provided by the embodiments of the present application amplify the drive control signal through the drive circuit module, generate the drive signal of the electronic expansion valve, drive the electronic expansion valve to act through the drive signal, and output the feedback signal to the controller module according to the drive signal of the electronic expansion valve through the feedback circuit module, so that the controller module can determine the target step number according to the feedback signal, the signal of the electronic expansion valve and the target opening of the electronic expansion valve, and send the drive control signal to the drive circuit module according to the target step number, to realize fine control, ensure that the actual opening of the electronic expansion valve is consistent with the target opening, and thus realize accurate control of the opening of the electronic expansion valve, ensure that the flow amount of the refrigerant in the system is perfectly matched with the demand, realize fine control of the refrigerant, and thus effectively improve the energy utilization efficiency of the air conditioning system and reduce energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which are incorporated into and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0036] One or more embodiments are exemplarily illustrated by pictures in the drawings corresponding thereto, and these exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise specified. The drawings do not constitute a proportional limitation.

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

[0038] Figure 2 A circuit principle diagram in which a feedback circuit module, a drive circuit module and an electronic expansion valve are connected, provided by an example of the present application;

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

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

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

[0042] Figure 6 A structural schematic diagram of an air conditioning equipment is provided for an embodiment of the present application.

[0043] Figure 7 A step flow schematic diagram of a control method of an electronic expansion valve is provided for an embodiment of the present application.

[0044] Figure 8 A step flow schematic diagram of a control method of an electronic expansion valve is provided for an embodiment of the present application.

[0045] Wherein, 110 is a controller module, 120 is a driving circuit module, 130 is a feedback circuit module, 140 is an electronic expansion valve, 210 is a feedback detection branch, I00 is a first driving control signal, I01 is a second driving control signal, I02 is a third driving control signal, I03 is a fourth driving 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 triode, Vcc is a power signal end, 310 is a power conversion circuit module, 500 is a control system, 510 is a control circuit, 600 is an air conditioning equipment. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplification, the components and arrangements of the specific examples are described in the following. Of course, they are only examples and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and it does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0048] To solve the problem that fine control cannot be realized due to the fact that the actual opening degree of the electronic expansion valve cannot be guaranteed to be consistent with the target opening degree in the prior art, the embodiments of the present application provide a control circuit, system, method and device for an electronic expansion valve. The driving control signal is amplified by a driving circuit module to generate a driving signal of the electronic expansion valve, so as to drive the electronic expansion valve to act by the driving signal. A feedback circuit module outputs a feedback signal to a controller module according to the driving signal of the electronic expansion valve, so that the controller module can determine a target step number according to the feedback signal, the signal of the electronic expansion valve and the target opening degree of the electronic expansion valve, and send the driving control signal to the driving circuit module according to the target step number, so as to guarantee that the actual opening degree of the electronic expansion valve is consistent with the target opening degree, realize accurate control of the opening degree of the electronic expansion valve, ensure that the flow amount of the refrigerant in the system perfectly matches the demand, and thus realize fine control of the refrigerant, effectively improve the energy utilization efficiency of the air conditioning system and reduce energy consumption.

[0049] Figure 1 A structural block diagram of a control circuit for an electronic expansion valve is provided in the embodiments of the present application. As shown in Figure 1 the control circuit for an electronic expansion valve provided by the embodiments of the present application includes a controller module 110, a driving circuit module 120, a feedback circuit module 130 and an electronic expansion valve 140. The driving circuit module 120 is configured to amplify the driving control signal sent by the controller module 110 to generate a driving signal of the electronic expansion valve. The feedback circuit module 130 is configured to output a feedback signal to the controller module 110 according to the driving signal. The controller module 110 is configured to determine a target step number according to the feedback signal, the phase signal of the electronic expansion valve 140 and the target opening degree of the electronic expansion valve 140, and send the driving control signal according to the target step number.

[0050] In the embodiments of the present application, the driving signal can drive the electronic expansion valve 140 to act, and specifically can be used to control the opening degree of the electronic expansion valve 140, such as can be used to control the actual opening degree of the electronic expansion valve 140. Specifically, the control circuit of the electronic expansion valve provided in the embodiments of the present application amplifies the driving control signal sent by the controller module 110 through the driving circuit module 120, to generate a driving signal of the electronic expansion valve based on the amplified signal, such as the driving circuit module 120 can amplify the driving control signal to a signal of a level sufficient to drive the electronic expansion valve 140, as a driving signal transmitted to the electronic expansion valve 140, to drive the resistance to act, and the driving signal can be detected by the feedback circuit module 130, to output a feedback signal to the controller module 110 according to the driving signal, so that the controller module 110 can determine the target step number according to the feedback signal, in combination with the phase number of the electronic expansion valve 140 and the target opening degree of the electronic expansion valve 140, to send the driving control signal to the driving circuit module 120 according to the target step number, to achieve fine control, so as to ensure that the actual opening degree of the electronic expansion valve 140 is consistent with the target opening degree, to achieve accurate control of the opening degree of the electronic expansion valve 140, and solve the problem that fine control cannot be achieved due to the inability to ensure that the actual opening degree of the electronic expansion valve 140 is consistent with the target opening degree in the prior art.

[0051] For example, in order to improve human comfort, the opening degree of the electronic expansion valve 140 can be accurately controlled, so that the refrigerant in the air conditioning system is controlled according to the fine control of the predetermined opening degree, to ensure that the flow of the refrigerant in the system is perfectly matched with the demand, to avoid the situation that the refrigerant flow is excessive or insufficient, thereby improving the energy utilization efficiency of the air conditioning system, and the accurate control of the refrigerant can make the air conditioning system more stable, to avoid temperature fluctuations, and can provide a more comfortable living or working environment for air conditioning users.

[0052] In specific implementation, the opening degree of the electronic expansion valve 140 determines the flow size. Therefore, in some optional embodiments of the present application, the control of the refrigerant flow in the air conditioning system can be realized by one or more electronic expansion valves 140.

[0053] Optionally, the control circuit of the electronic expansion valve provided in the embodiments of the present application can include one or more than two electronic expansion valves, which are not limited in the embodiments of the present application.

[0054] Specifically, in the case that the number of electronic expansion valves 140 is greater than one, the feedback circuit module 130 in the embodiments of the present application can include a feedback detection branch connected in one-to-one correspondence with the electronic expansion valves 140, and the detection end of each feedback detection branch is electrically connected to the drive control end of the electronic expansion valve 140 connected thereto, so that the drive signal of the electronic expansion valve connected thereto can be detected 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 thus the controller module 110 can determine the actual opening degree of the electronic expansion valve 140 according to the feedback signal, so as to realize precise control of the opening degree of the electric expansion valve based on the actual opening degree of the electronic expansion valve 140. The drive control end is configured to receive the drive signal, and the feedback output end is configured to output the feedback signal.

[0055] In some optional embodiments of the present application, the feedback circuit module 130 can be composed of resistors, capacitors, and transistors to form a feedback detection branch connected in one-to-one correspondence with the electronic expansion valve 140, so that the drive signal of the electronic expansion valve connected thereto can be detected 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 embodiments of the present application is electrically connected to the drive control end of the electronic expansion valve 140 connected thereto, so that each feedback detection branch can detect the drive signal of the electronic expansion valve connected thereto, 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. The drive control end of the electronic expansion valve 140 is configured to receive the drive signal of the electronic expansion valve, and the feedback output end of the feedback detection branch is configured to output the feedback signal.

[0057] As an example of the present application, in the case that four electronic expansion valves 140 are driven by the drive circuit module 120, four drive control signals can be sent by the controller module 110 to the drive circuit module 120, which are a first drive control signal I00, a second drive control signal I01, a third drive control signal I02, and a fourth drive control signal I03, as shown in the following table: Figure 2As shown, the four drive control signals can be amplified by the drive circuit module 120 to output amplified signals as drive signals of the electronic expansion valves, for example, when the four drive control signals are low-level control signals, the drive circuit module 120 can amplify the low-level control signals into high-level signals sufficient to drive the electronic expansion valves 140 to drive the electronic expansion valves 140 to act, and meanwhile, the feedback detection branches 210 included in the feedback circuit module 130 can detect drive signals of the electronic expansion valves connected to the feedback detection branches 210, so that the four feedback detection branches 210 can output corresponding feedback signals based on the detected drive signals, i.e., the first feedback signal FB0, the second feedback signal FB1, the third feedback signal FB2, and the fourth feedback signal FB3, and 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 to detect the levels of the four feedback signals by the controller module 110 to calculate the actual opening degrees of the four electronic expansion valves 140.

[0058] It should be noted that 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 used to calculate the opening degree of the first electronic expansion valve detected by the first feedback detection branch 210, and the opening degree 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 used to calculate the opening degree of the second electronic expansion valve detected by the second feedback detection branch 210, and the opening degree of the second electronic expansion valve can be controlled by the second drive control signal I01; the third feedback signal FB2 is a feedback signal output by the third feedback detection branch in the feedback circuit module 130, which can be used to calculate the opening degree of the third electronic expansion valve detected by the third feedback detection branch, and the opening degree of the third electronic expansion valve can be controlled by the third drive control signal I02; and the fourth feedback signal FB3 is a feedback signal output by the fourth feedback detection branch in the feedback circuit module 130, which can be used to calculate the opening degree of the fourth electronic expansion valve detected by the fourth feedback detection branch 210, and the opening degree 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 four, or other numbers, for example, the feedback circuit module 130 can include one or N feedback detection branches 210, where n is an integer greater than one, and the embodiments of the present application do not limit this.

[0060] In some embodiments of this 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; as shown Figure 2 As shown, the first end of the first resistor R1 is electrically connected to the drive control terminal of the electronic expansion valve 140 to which it is connected. 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 terminal of the transistor Q, the second end of the third resistor R3, and the feedback input terminal of the controller module 110 are electrically connected. The first end of the third resistor R3 is electrically connected to the power signal terminal Vcc of the feedback detection branch 210. The second terminal 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. Thus, the conduction of the transistor Q can be controlled by the drive signal of the electronic expansion valve, and a feedback signal is obtained and output to the controller module 110. The controller module 110 detects the feedback signal and calculates the actual opening degree of the electronic expansion valve 140 based on the feedback signal.

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

[0062] In some optional embodiments of this application, each feedback detection branch 210 further includes a second capacitor C2; the first terminal of the second capacitor C2, the first terminal of the transistor Q, the second terminal of the third resistor R3, and the feedback input terminal of the controller module 110 are electrically connected, and the second terminal of the second capacitor C2 is electrically connected to the reference ground, so that voltage regulation and filtering can be performed through the second capacitor C2 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 comprises 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 of the electronic expansion valve, and the feedback circuit module 130 outputs a feedback signal to the controller module 110 according to the drive signal of the electronic expansion valve, so that the controller module 110 can determine a target step number according to the feedback signal, the phase number of the electronic expansion valve 140 and the target opening degree of the electronic expansion valve 140, and send the drive control signal to the drive circuit module 120 according to the target step number to realize fine control, thereby ensuring that the actual opening degree of the electronic expansion valve 140 is consistent with the target opening degree, realizing accurate control of the opening degree of the electronic expansion valve 140, and further solving the problem that fine control cannot be realized due to the inconsistency between the actual opening degree and the target opening degree of the electronic expansion valve 140 in the prior art.

[0064] Of course, the control circuit of the electronic expansion valve in the embodiment of the present application can 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, and the present application is not limited thereto.

[0065] Optionally, on the basis of the above-mentioned embodiment, the control circuit of the electronic expansion valve provided in the embodiment of the present application further comprises a power conversion circuit module 310, as shown in Figure 3 The power conversion circuit module 310 is used for voltage conversion according to the power signal of the control circuit to output a working voltage signal for power supply to the controller module 110, the drive circuit module 120 and the feedback circuit module 130. The working voltage signal is used for power supply to the controller module 110, the drive circuit module 120 and the feedback circuit module 130 to provide working voltage for the controller module 110, the drive circuit module 120 and the feedback circuit module 130, 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 this application, the controller module 110 may include a controller, which acts as a control center and is responsible for processing data and generating control commands. Specifically, it may be used to receive signals such as external temperature and humidity, and to calculate the target opening degree that the electronic expansion valve 140 needs to control based on these received signals and preset operating parameters. It may also include an algorithm module for receiving feedback signals from the feedback circuit module 130. Based on these feedback signals, the actual opening degree of the electronic expansion valve 140 can be calculated through a certain algorithm, thereby accurately controlling the opening degree of the electronic expansion valve 140 and thus accurately controlling the refrigerant flow.

[0067] The controller included in the controller module 110 can be a microcontroller (MCU) or other types of controllers, and this application embodiment does not impose specific limitations on this.

[0068] As an example of this 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 major components such as a microcontroller unit (MCU), a power conversion circuit, a feedback circuit, a drive circuit, and an electronic expansion valve. The microcontroller, as the control center of the system, is responsible for processing data and generating control commands. The control system can obtain feedback signals through the feedback circuit and output them to the microcontroller. The microcontroller detects the level of the feedback signal to calculate the actual opening degree of the electronic expansion valve. Based on the difference between the actual opening degree and the target opening degree of the electronic expansion valve, the target number of steps is determined. The drive control signal is sent to the drive circuit module 120 according to the target number of steps. The drive circuit module 120, as the drive circuit, can amplify the drive control signal to generate the drive signal for the electronic expansion valve, which is used to drive the electronic expansion valve to operate, thereby achieving precise control of the opening degree of the electronic expansion valve.

[0069] like Figure 5 As shown, this 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, which can be the control circuit for the electronic expansion valve described in any of the above embodiments of this application.

[0070] In practical implementation, the power conversion circuit module can serve as the power conversion circuit of the control system. Specifically, it can be used to convert the original power supply voltage into a working voltage suitable for the microcontroller and other electronic devices, so as to provide working voltage signals for the microcontroller and other electronic devices, realize power supply, and ensure that the microcontroller and other electronic devices can work normally.

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

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

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

[0074] In some optional embodiments of the present application, the electronic expansion valve can be used to control the flow of refrigerant in an air conditioning device, so that the air conditioning device can ensure that the flow of refrigerant in the system perfectly matches the demand by precisely controlling the opening degree of the electronic expansion valve, avoid the situation of excessive or insufficient refrigerant flow, realize precise control of the flow of refrigerant, and further improve the operation efficiency of the air conditioner and the comfort of human body.

[0075] For example, the electronic expansion valve can be used to control the flow of refrigerant in an air conditioning device, so that the air conditioning device can ensure that the flow of refrigerant in the system perfectly matches the demand by precisely controlling the opening degree of the electronic expansion valve, avoid the situation of excessive or insufficient refrigerant flow, realize precise control of the flow of refrigerant, and further improve the operation efficiency of the air conditioner and the comfort of human body. Figure 6As shown, the air conditioning equipment 600 provided by the embodiments of the present application comprises a control system 500 of an electronic expansion valve, which can be the control system described in any of the embodiments of the present application, so that the air conditioning equipment 600 can amplify the drive control signal through the drive circuit module 120, generate the drive signal of the electronic expansion valve, and output the feedback signal according to the drive signal of the electronic expansion valve through the feedback circuit module 130, so as to determine the target step number according to the feedback signal, in combination with the phase number of the electronic expansion valve 140 and the target opening degree of the electronic expansion valve, so that the drive control signal can be sent to the drive circuit module 120 according to the target step number, so as to ensure that the actual opening degree of the electronic expansion valve is consistent with the target opening degree, realize accurate control of the opening degree of the electronic expansion valve, and further ensure that the flow amount of the refrigerant in the system is perfectly matched with the demand, realize fine control of the refrigerant, make the air conditioning system more stable, avoid temperature fluctuation, provide a more comfortable living or working environment, and effectively improve the energy utilization efficiency of the air conditioning system and reduce energy consumption.

[0076] As shown, Figure 7 The embodiments of the present application provide a step flowchart of a control method of an electronic expansion valve. In specific implementation, the control method of the electronic expansion valve provided by the embodiments of the present application can be applied in the control circuit of the electronic expansion valve described in any of the above embodiments of the present application, and specifically can be applied in the control system described in the above embodiments, as shown, Figure 7 The control method specifically can comprise the following steps:

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

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

[0079] Step 730, sending a drive control signal according to the target step number, the drive control signal being used to generate the drive signal.

[0080] It can be seen that the control method of the electronic expansion valve provided by the embodiments of the present application can output a feedback signal according to the drive signal of the electronic expansion valve, determine a target step number according to the feedback signal, in combination with the signal of the electronic expansion valve and the target opening degree of the electronic expansion valve, so that the drive control signal can be sent according to the target step number, realize fine control, ensure that the actual opening degree of the electronic expansion valve is consistent with the target opening degree, and solve the problem that fine control cannot be realized due to the fact that the actual opening degree of the electronic expansion valve cannot be consistent with the target opening degree in the prior art.

[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 degree of the electronic expansion valve based on the feedback signal, so as to compare the target opening degree and the actual opening degree of the current electronic expansion valve, and drive the target step number of the electronic expansion valve based on the comparison result, and then run according to the target step number to output the driving signal according to the target step number, control the opening degree of the electronic expansion valve, and realize accurate control of the opening degree of the electronic expansion valve. Optionally, the embodiment of the present application determines the target step number according to the feedback signal, in combination with the signal of the electronic expansion valve and the target opening degree of the electronic expansion valve, and specifically can include the following sub-steps:

[0082] Sub-step S11, determining signal feedback data by using the feedback signal;

[0083] Sub-step S12, determining phase number actual data by using the signal of the electronic expansion valve;

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

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

[0086] The signal feedback data can be 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 signal can be spliced in sequence to process the binary data obtained by splicing to obtain a processed feedback value F(x) as the signal feedback data.

[0087] The signal of the electronic expansion valve is the signal of the electronic expansion valve, and specifically can be a signal set according to the phase and frequency of the electronic expansion valve function book. The phase actual data can be actual data calculated according to the signal of the electronic expansion valve. For example, after obtaining the phase signal of the electronic expansion valve, the phase signal of the electronic expansion valve can be spliced into a four-bit binary data in sequence to obtain the processed actual value R(x) as the phase actual data. Thus, the actual opening of the electronic expansion valve can 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 target opening of the current electronic expansion valve is consistent with the actual opening of the electronic expansion valve, and the target opening of the current 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 can be calculated according to the difference between the feedback value F(x) and the processed actual value R(x) and the target opening of the electronic expansion valve.

[0088] In some optional embodiments of the present application, the actual opening of the electronic expansion valve is calculated according to the feedback data and the phase actual data in combination with the target opening of the electronic expansion valve, and specifically can include: comparing the feedback data with the phase actual data to obtain comparison data difference; and calculating the actual opening 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 phase actual data. For example, the feedback data can be subtracted from the phase actual data to determine the difference between the feedback data and the phase actual data as the comparison data difference, so that the actual opening of the electronic expansion valve can be calculated according to the comparison data difference in combination with the target opening of the electronic expansion valve.

[0089] After the actual opening degree of the electronic expansion valve is calculated, the actual opening degree of the electronic expansion valve can be compared with the target opening degree of the electronic expansion valve to determine whether the target opening degree of the current electronic expansion valve is consistent with the actual opening degree of the electronic expansion valve; if the target opening degree of the current electronic expansion valve is consistent with the actual opening degree of the electronic expansion valve, the operation can be controlled according to the predetermined parameters, and the driving control signal can be output to the driving circuit according to the predetermined step number, wherein the predetermined parameters can include various operation control parameters set in advance, such as the predetermined step number, which can be used to output the driving control signal for controlling the opening degree of the electronic expansion valve; if the target opening degree of the current electronic expansion valve is not consistent with the actual opening degree of the electronic expansion valve, the step number of the electronic expansion valve is adjusted according to the difference between the actual opening degree and the target opening degree of the electronic expansion valve, and the adjusted step number can be used as the target step number to output the driving control signal for controlling the opening degree of the electronic expansion valve according to the target step number, so that the opening degree of the electronic expansion valve can be controlled by the target step number, and fine control of the opening degree of the electronic expansion valve can be realized.

[0090] In some optional embodiments of the present application, the target step number is determined according to the difference between the actual opening degree and the target opening degree of the electronic expansion valve, and specifically can include: comparing the actual opening degree with the target opening degree of the electronic expansion valve to obtain the difference; if the difference reaches a preset opening degree difference threshold, the target step number is obtained by adjusting the preset predetermined step number corresponding to the target opening degree according to the difference.

[0091] The preset opening degree difference threshold refers to the maximum opening degree error set in advance, and the specific value can be set according to the control accuracy, and the embodiments of the present application do not limit this. The preset predetermined step number refers to the step number set in advance for the target opening degree, and specifically can be used to output the driving control signal to control the opening degree of the electronic expansion valve.

[0092] Specifically, after the actual opening degree of the electronic expansion valve is determined, the actual opening degree of the electronic expansion valve can be compared with the target opening degree of the electronic expansion valve to determine whether the target opening degree of the current electronic expansion valve is consistent with the actual opening degree of the electronic expansion valve according to the comparison result. Specifically, by comparing the actual opening degree of the electronic expansion valve with the target opening degree of the electronic expansion valve, the difference between the actual opening degree of the electronic expansion valve and the target opening degree of the electronic expansion valve can be obtained, and whether the target opening degree of the current electronic expansion valve is consistent with the actual opening degree of the electronic expansion valve can be determined by judging whether the difference reaches the preset opening degree difference threshold; if the difference between the actual opening degree of the electronic expansion valve and the target opening degree of the electronic expansion valve is less than the preset opening degree difference threshold, it can be considered that the target opening degree of the current electronic expansion valve is consistent with the actual opening degree of the electronic expansion valve, and then the control can be performed according to the predetermined number of steps, such as outputting the control driving signal according to the predetermined number of steps, and the driving circuit can output the driving signal of the electronic expansion valve by driving the control driving signal to drive the electronic expansion valve to act, so as to realize the opening degree control of the electronic expansion valve; if the difference between the actual opening degree of the electronic expansion valve and the target opening degree of the electronic expansion valve is equal to or greater than the preset opening degree difference threshold, it can be considered that the target opening degree of the current electronic expansion valve is inconsistent with the actual opening degree of the electronic expansion valve, and then the preset predetermined 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 to adjust the actual opening degree of the electronic expansion valve, until the actual opening degree of the electronic expansion valve is consistent with the target opening degree, the step number adjustment is stopped, and the control driving signal is output according to the final target predetermined number of steps to realize the fine control of the electronic expansion valve. The target predetermined number of steps refers to the target number of steps determined when the actual opening degree of the electronic expansion valve is consistent with the target opening degree.

[0093] As an example of the present application, in the case of the feedback signal being the feedback level signal of the feedback circuit, after receiving the feedback level signal of the feedback circuit, the received feedback level signal can be spliced in sequence, such as in the case where the received feedback level signal includes: the first feedback signal FB0, the second feedback signal FB1, the third feedback signal FB2, and the 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 to form a four-bit binary data, and the four-bit binary data can be output to obtain the processed feedback value F(x), such as Figure 8As shown, step S1, the processed feedback value F(x) is obtained, and then the signal 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, the processed actual value R(x) is obtained, so as to compare the feedback value F(x) with the processed actual value R(x), and calculate the actual opening degree and the target opening degree of the electronic expansion valve, that is, step S3, the target opening degree and the actual opening degree are obtained, for example, when R(x) is equal to F(x), the target opening degree of the electronic expansion valve can be determined as the actual opening degree of the electronic expansion valve, and in the case where R(x) is not equal to F(x), the actual opening degree can be calculated according to the difference between the feedback value F(x) and the processed actual value R(x) and the target opening degree of the electronic expansion valve, so as to calculate the actual opening degree of the current electronic expansion valve, and the target opening degree of the electronic expansion valve can be calculated according to the signals of the external temperature, humidity and other signals received by the microcontroller and the preset running parameters, which is not limited in the examples of the present application.

[0094] After obtaining the target opening degree and the actual opening degree, whether adjustment is needed can be determined by judging whether the target opening degree and the actual opening degree are consistent, that is, step S4, whether the target opening degree and the actual opening degree of the electronic expansion valve are consistent is judged; if the target opening degree and the actual opening degree of the electronic expansion valve are consistent, it can be determined that the target opening degree corresponding to the preset determined number of steps does not need to be adjusted, and the determined number of steps can be taken as the target number of steps, so as to run according to the determined number of steps, that is, step S5, the system runs according to the target determined number of steps, which refers to the determined number of steps set for the target opening degree in advance; if the target opening degree and the actual opening degree of the electronic expansion valve are not consistent, the target opening degree corresponding to the preset determined number of steps can be adjusted based on the difference between the actual opening degree and the target opening degree of the electronic expansion valve, and the adjusted number of steps can be taken as the target number of steps to output the control driving signal, so as to adjust the actual opening degree of the electronic expansion valve to the target opening degree, that is, step S6, the actual opening degree of the electronic expansion valve is continuously adjusted to be equal to the target opening degree, and runs according to the target number of steps, so as to accurately control the opening degree of the electronic expansion valve, and further accurately control the refrigerant flow.

[0095] For example, after the air conditioning multi-split system starts running, the electronic expansion valve receives the signal from the microcontroller, the running opening degree changes, so that the feedback circuit can generate a feedback signal to the microcontroller based on the electronic expansion valve control port level, and then the microcontroller can calculate the actual opening degree of the electronic expansion valve through a certain algorithm after receiving the feedback signal fed back by the feedback circuit, so as to realize the control of the electronic expansion valve based on the actual opening degree and the target opening degree, thereby accurately controlling the opening degree of the electronic expansion valve, and further accurately controlling the refrigerant flow, so as to make the air conditioning system more stable, avoid temperature fluctuation, and provide a more comfortable living or working environment.

[0096] The system, device, method embodiments described above are only exemplary. The units described as separate units can or can not be physically separate, and the units displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment.

[0097] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be realized by means of software plus a general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions 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 a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0098] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless explicitly stated otherwise. It is also to be understood that additional or alternative steps can be employed.

[0099] The above description is merely illustrative of the application and is not intended to limit the scope of the application. Various modifications of the embodiments described herein will be apparent to those with skill in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. The present application is thus to be accorded the broadest scope allowable by the claims.

Claims

1. A control circuit for an electronic expansion valve, characterized in that, include: Controller module, drive circuit module, feedback circuit module, and electronic expansion valve; The drive circuit module is used to amplify the drive control signal sent by the controller module to generate the drive signal for the electronic expansion valve. The feedback circuit module is used to output a feedback signal to the controller module based on the drive signal; The controller module is used to determine the target number of steps based on the feedback signal, combined with the signal of the electronic expansion valve and the target opening degree of the electronic expansion valve, and send the drive control signal according to the target number of steps; The feedback circuit module includes feedback detection branches that are connected one-to-one with the electronic expansion valves. 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. 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. Each feedback detection branch includes a first resistor, a second resistor, a third resistor, a first capacitor, and a transistor; The first end of the first resistor is electrically connected to the drive control terminal 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 terminal of the transistor, the second end of the third resistor, and the feedback input terminal of the controller module are electrically connected. The first end of the third resistor is electrically connected to the power signal terminal of the feedback detection branch. The second terminal 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.

2. The control circuit of the electronic expansion valve according to claim 1, characterized in that, The number of electronic expansion valves is greater than one.

3. The control circuit of the electronic expansion valve according to claim 1, characterized in that, Each feedback detection branch also includes a second capacitor; The first terminal of the second capacitor, the first terminal of the transistor, the second terminal of the third resistor, and the feedback input terminal of the controller module are electrically connected, and the second terminal of the second capacitor is electrically connected to the reference ground.

4. The control circuit for the electronic expansion valve according to any one of claims 1 to 3, characterized in that, The control circuit also includes a power conversion circuit module; The power conversion circuit module is used to perform voltage conversion based on the power signal of the control circuit and output a working voltage signal, which is used to power the controller module, the drive circuit module and the feedback circuit module.

5. A control system for an electronic expansion valve, characterized in that, The control system includes the control circuitry for the electronic expansion valve as described in any one of claims 1 to 4.

6. A control method for an electronic expansion valve, characterized in that, The control method, applied to the control system of the electronic expansion valve as described in claim 5, comprises: Based on the drive signal of the electronic expansion valve, a feedback signal is output; Based on the feedback signal, combined with the signal from the electronic expansion valve and the target opening degree of the electronic expansion valve, the target number of steps is determined; Drive control signals are sent according to the target number of steps, and the drive control signals are used to generate the drive signals.

7. The control method according to claim 6, characterized in that, The step of determining the target number of steps based on the feedback signal, combined with the signal from the electronic expansion valve and the target opening degree of the electronic expansion valve, includes: The feedback signal is used to determine the signal feedback data; The actual phase number data is determined using the signal from the electronic expansion valve. Based on the feedback data and the actual phase number data, and combined with the target opening degree of the electronic expansion valve, the actual opening degree of the electronic expansion valve is calculated. The target number of steps is determined based on the difference between the actual opening and the target opening.

8. The control method according to claim 7, characterized in that, The calculation of the actual opening degree of the electronic expansion valve based on the feedback data and the actual phase signal data, combined with the target opening degree of the electronic expansion valve, includes: The feedback data is compared with the actual phase number data to obtain the comparison data difference; The actual opening is calculated based on the difference in the comparison data and the target opening.

9. The control method according to claim 7, characterized in that, Determining the target number of steps based on the difference between the actual opening degree and the target opening degree of the electronic expansion valve includes: The actual opening degree is compared with the target opening degree of the electronic expansion valve to obtain the difference value; 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.

10. An air conditioning device, characterized in that, The air conditioning equipment includes a control system for the electronic expansion valve as described in claim 5.

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