Water mixing valve control circuit, water mixing valve and air conditioner

Abstract

The invention provides a water mixing valve control circuit, a water mixing valve and an air conditioner, and belongs to the field of electronic circuits, a control module outputs a PWM signal corresponding to a target opening degree to a charging and discharging module, the charging and discharging module outputs a control voltage corresponding to the PWM signal so as to control the opening degree of the water mixing valve, a feedback detection module collects the opening degree voltage of the water mixing valve and outputs the opening degree voltage to the control module, and the control module controls the opening degree of the water mixing valve. When the actual opening degree of the water mixing valve indicated by the opening degree voltage is inconsistent with the target opening degree, the control module adjusts the duty ratio of the output PWM signal so as to adjust the opening degree of the water mixing valve by adjusting the voltage output to the water mixing valve until the actual opening degree of the water mixing valve is consistent with the target opening degree. Thus, the opening degree of the water mixing valve can be accurately controlled, the water mixing valve can be controlled to achieve various opening degrees, and the use experience of a user is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a water mixing valve control circuit, a water mixing valve and an air conditioner. Background Art

[0002] The hot and cold water in the air conditioning system plays a very important role in the cooling and heating process. The cold water is mainly used to take away the heat in the refrigerant and play a cooling role, while the hot water is mainly used to heat the air conditioner and play a role in heating. The mixing valve is a valve used to adjust the flow of hot and cold water in the air conditioning system. It can adjust the opening and closing of the valve according to needs to control the flow of hot and cold water.

[0003] Currently, the mixing valve of the air conditioner is usually controlled by a relay, and has only two states: closed and open. The opening size of the mixing valve cannot be controlled, resulting in low control accuracy and poor user experience. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present application is to provide a water mixing valve control circuit, a water mixing valve and an air conditioner, which can more accurately control the opening size of the water mixing valve to enhance the user experience.

[0005] In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] In a first aspect, an embodiment of the present application provides a water mixing valve control circuit, including a feedback detection module, a charge and discharge module, and a control module;

[0007] The PWM output end of the control module is connected to the control end of the charge and discharge module, and the input end of the charge and discharge module is used to connect to the power supply;

[0008] The output end of the charging and discharging module is used to connect with the voltage input end of the water mixing valve, the detection end of the feedback detection module is used to connect with the feedback interface of the water mixing valve, and the output end of the feedback detection module is connected with the first input end of the control module;

[0009] The control module is used to output a PWM signal corresponding to the target opening to the control end of the charge and discharge module;

[0010] The charging and discharging module is used to output a control voltage to the water mixing valve according to the PWM signal to control the opening of the water mixing valve;

[0011] The feedback detection module is used to collect the opening voltage of the water mixing valve when it is working, and output the opening voltage to the control module;

[0012] The control module is further configured to adjust the duty cycle of the PWM signal output to the charge and discharge module when the opening voltage indicates that the actual opening of the water mixing valve is inconsistent with the target opening.

[0013] In a possible implementation, the water mixing valve control circuit further includes an output detection module, a detection end of the output detection module is connected to the output end of the charge and discharge module, and an output end of the output detection circuit is connected to the second input end of the control module;

[0014] The output detection circuit is used to collect the output voltage of the charging and discharging module and output it to the control module;

[0015] The control module is used to adjust the duty cycle of the PWM signal output to the charging and discharging module when the output voltage is inconsistent with the target voltage corresponding to the target opening.

[0016] In a possible implementation, the charging and discharging module includes a charging and discharging unit and a switching unit;

[0017] The input end of the switch unit is connected to the control end of the charge and discharge module, and the output end of the switch unit is connected to the control end of the charge and discharge unit;

[0018] The voltage input end of the charging and discharging unit is used to be connected to the power supply, and the output end of the charging and discharging unit is connected to the output end of the charging and discharging module;

[0019] The switch unit is used to control the charging or discharging of the charging and discharging unit according to the PWM signal.

[0020] In a possible implementation, the charge and discharge unit includes a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor, a fourth voltage-dividing resistor, a current-limiting resistor, an energy storage component, and a PNP transistor;

[0021] One end of the first voltage-dividing resistor is used to be connected to a power supply, and the other end of the first voltage-dividing resistor is respectively connected to one end of the second voltage-dividing resistor, one end of the third voltage-dividing resistor and the emitter of the PNP transistor;

[0022] The other end of the third voltage-dividing resistor is respectively connected to one end of the fourth voltage-dividing resistor and the base of the PNP transistor;

[0023] The other end of the fourth voltage-dividing resistor is connected to the control end of the charge-discharge unit;

[0024] The collector of the PNP transistor is connected to one end of the current limiting resistor, and the other end of the current limiting resistor is respectively connected to the positive electrode of the energy storage component and the output end of the charge and discharge unit;

[0025] The other end of the second voltage-dividing resistor and the negative electrode of the energy storage component are grounded.

[0026] In a possible implementation manner, the switch unit includes a current limiting resistor, a pull-down resistor and an NPN transistor;

[0027] One end of the current limiting resistor is connected to the input end of the switch unit, and the other end of the current limiting resistor is connected to the base of the NPN transistor and one end of the pull-down resistor respectively;

[0028] The emitter of the NPN transistor and the other end of the pull-down resistor are grounded, and the collector of the NPN transistor is connected to the output end of the switch unit.

[0029] In a possible implementation, the feedback detection module includes a first voltage dividing unit and a first filtering unit;

[0030] The first input end of the first voltage divider unit is used to connect to the detection power supply, the second input end of the first voltage divider power supply is connected to the feedback interface of the water mixing valve, the output end of the first voltage divider unit is connected to the input end of the first filter unit, and the output end of the first filter unit is connected to the first input end of the control module.

[0031] In a possible implementation, the output detection module includes a second voltage dividing unit and a second filtering unit;

[0032] The first input end of the second voltage divider unit is used to connect to the detection power supply, the second input end of the second voltage divider power supply is connected to the output end of the charging and discharging module, the output end of the second voltage divider unit is respectively connected to the input end of the second filtering unit, and the output end of the second filtering unit is connected to the output end of the output detection module.

[0033] In a possible implementation manner, the feedback detection module further includes a voltage stabilizing unit, and a voltage stabilizing end of the voltage stabilizing unit is connected to the second input end of the first voltage dividing unit.

[0034] In a second aspect, an embodiment of the present application provides a water mixing valve, comprising a water mixing valve control circuit as described in any possible embodiment of the first aspect.

[0035] In a third aspect, an embodiment of the present application provides an air conditioner, comprising a mixing valve and a mixing valve control circuit as described in any possible implementation manner of the first aspect.

[0036] The embodiment of the present application provides a water mixing valve control circuit, a water mixing valve and an air conditioner, wherein the water mixing valve control circuit is connected to the control end of the charge and discharge module through the PWM output end of the control module, the input end of the charge and discharge module is connected to the power supply, the output end of the charge and discharge module is connected to the voltage input end of the water mixing valve, and the detection end of the feedback detection module is connected to the feedback interface of the water mixing valve, and the output end of the feedback detection module is connected to the first input end of the control module. In this way, the control module outputs a PWM signal corresponding to the target opening to the charge and discharge module, the charge and discharge module outputs a control voltage corresponding to the PWM signal to control the opening of the water mixing valve, the feedback detection module collects the opening voltage of the water mixing valve and outputs it to the control module, and when the actual opening of the water mixing valve indicated by the opening voltage is inconsistent with the target opening, the control module adjusts the duty cycle of the output PWM signal to adjust the opening of the water mixing valve by adjusting the voltage output to the water mixing valve, until the actual opening of the water mixing valve is consistent with the target opening. In this way, the opening size of the water mixing valve can be accurately controlled, and the water mixing valve can be controlled to achieve various openings, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is one of the structural schematic diagrams of the water mixing valve control circuit provided in the embodiment of the present application.

[0038] Figure 2 This is the second structural schematic diagram of the water mixing valve control circuit provided in the embodiment of the present application.

[0039] Figure 3 This is the third structural schematic diagram of the water mixing valve control circuit provided in the embodiment of the present application.

[0040] Explanation of the accompanying drawings: 10 - control module; 20 - charging and discharging module; 201 - charging and discharging unit; 202 - switching unit; 30 - feedback detection module; 301 - first voltage dividing unit; 302 - first filtering unit; 303 - voltage stabilizing unit; 40 - output detection module; 401 - second voltage dividing unit; 402 - second filtering unit; 50 - water mixing valve. DETAILED DESCRIPTION

[0041] 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, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present application, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0046] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] Currently, the mixing valve of the air conditioner is usually controlled by a relay. Under the control of the relay, the opening of the mixing valve has only two states: closed and fully open. The opening size of the mixing valve cannot be controlled, resulting in low control accuracy and poor user experience.

[0048] Based on the above considerations, an embodiment of the present application provides a mixing valve control circuit, which can control the opening and closing of the mixing valve, and can adjust the opening of the mixing valve to any size, that is, control the mixing valve to achieve various openings, improve air-conditioning performance, and thus greatly improve the user experience.

[0049] In a possible implementation manner, the present application embodiment provides a water mixing valve control circuit, referring to Figure 1The water mixing valve control circuit may include a feedback detection module 30 , a charge and discharge module 20 and a control module 10 .

[0050] The PWM output end of the control module 10 is connected to the control end of the charge and discharge module 20 , and the input end of the charge and discharge module 20 is used to be connected to a power supply.

[0051] The output end of the charge and discharge module 20 is used to connect to the voltage input end of the mixing valve 50 , the detection end of the feedback detection module 30 is used to connect to the feedback interface of the mixing valve 50 , and the output end of the feedback detection module 30 is connected to the first input end WVFK of the control module 10 .

[0052] The control module 10 is used to output a PWM signal corresponding to the target opening to the control end of the charge and discharge module 20 .

[0053] The target opening can be obtained by the user inputting a target temperature to the control module 10 through a remote control, a control panel, a mobile terminal, etc., and the control module 10 converts the target temperature. The purpose of the target temperature input by the user can be to adjust the air conditioning temperature and the water temperature.

[0054] The charge-discharge module 20 is used to output a control voltage to the water mixing valve 50 according to the PWM signal, so as to control the opening degree of the water mixing valve 50 .

[0055] For example, at a high level, the charge and discharge module 20 charges, and at a low level, the charge and discharge module 20 discharges. It should be understood that when the duty cycle of the PWM signal changes, the charge and discharge time of the charge and discharge module 20 changes accordingly, and the output voltage of the charge and discharge module 20 also changes accordingly.

[0056] The feedback detection module 30 is used to collect the opening voltage of the water mixing valve 50 when it is working, and output the opening voltage to the control module 10 .

[0057] The control module 10 is further used to adjust the duty cycle of the PWM signal output to the charge and discharge module 20 when the actual opening of the water mixing valve 50 indicated by the opening voltage is inconsistent with the target opening.

[0058] It should be understood that the voltage of the feedback interface of the mixing valve 50 (i.e., the opening voltage) changes synchronously with the opening of the input mixing valve 50 (i.e., the opening after the voltage output by the charging and discharging module 20 acts on it). Therefore, the opening voltage can indicate the actual opening of the mixing valve 50.

[0059] After the control module 10 receives the target temperature input by the user, it converts the target temperature to determine the target opening and the PWM signal corresponding to the target opening, and outputs the PWM signal corresponding to the target opening to the charge and discharge module 20. After receiving the PWM signal, the charge and discharge module 20 charges at a high level and discharges at a low level to output the control voltage to the mixing valve 50. Alternatively, it charges at a low level and discharges at a high level to output the control voltage to the mixing valve 50.

[0060] Under the control voltage, the internal circuit of the water mixing valve 50 starts to change the opening, and at the same time, outputs a voltage feedback signal at the feedback interface. The feedback detection module 30 collects the voltage feedback signal, obtains the opening voltage, and transmits the opening voltage to the control module 10.

[0061] When the control module 10 determines that the actual opening of the mixing valve 50 based on the opening voltage is inconsistent with the target opening, it can adjust the duty cycle of the PWM signal output to the charge and discharge module 20 according to the opening difference to adjust the charging time and discharging time of the charge and discharge module 20, and then adjust the control voltage input to the mixing valve 50 to adjust the opening of the mixing valve 50 until the actual opening of the mixing valve 50 is consistent with the target opening.

[0062] Compared with the traditional relay control circuit, the mixing valve control circuit provided in the present application can accurately control the opening size of the mixing valve, and can control the mixing valve to achieve various openings, thereby improving the user experience.

[0063] In order to further improve the control accuracy and make the control voltage input to the water mixing valve 50 more accurate, a feedback adjustment of the control voltage is introduced into the control circuit of the water mixing valve 50. Figure 2 The water mixing valve 50 control circuit provided in the present application may further include an output detection module 40 .

[0064] The detection end of the output detection module 40 is connected to the output end of the charge and discharge module 20 , and the output end of the output detection circuit is connected to the second input end WVAD of the control module 10 .

[0065] The output detection circuit is used to collect the output voltage of the charge and discharge module 20 and output it to the control module 10 .

[0066] The control module 10 is used to adjust the duty cycle of the PWM signal output to the charge and discharge module 20 when the output voltage is inconsistent with the target voltage corresponding to the target opening.

[0067] When the water mixing valve device is turned on, the output detection module 40 collects the voltage at the output end of the charge and discharge module 20, obtains the output voltage, and transmits the output voltage to the control module 10. When the output voltage is inconsistent with the target voltage of the target opening, the control module 10 can adjust the duty cycle of the PWM signal according to the voltage difference to adjust the charging time and discharging time of the charge and discharge module 20, and further adjust the control voltage input to the water mixing valve 50 until the output control voltage is consistent with the target voltage corresponding to the target opening.

[0068] In this way, the control voltage is adjusted according to the actual output voltage of the charge and discharge module 20 , so as to further improve the control accuracy, which helps to improve the control accuracy of the opening of the water mixing valve 50 .

[0069] It should be noted that when the opening voltage indicates that the actual opening is inconsistent with the target opening, and at the same time the output voltage indication of the output detection module 40 is inconsistent with the target power supply, the duty cycle of the PWM signal can be adjusted according to the opening voltage first, and then the duty cycle of the PWM signal can be adjusted according to the output voltage.

[0070] Alternatively, when the difference between the actual opening indicated by the opening voltage and the target opening is less than a preset threshold, the duty cycle of the PWM signal may be adjusted according to the output voltage. In this way, the opening voltage is used as a rough adjustment reference, and the output voltage is used as a fine adjustment reference, which can greatly improve the control accuracy of the opening of the mixing valve 50.

[0071] The setting of the control module 10 can be flexibly selected. For example, an MCU can be used as the control module 10, a PLC can be used as the control module 10, or a PLC circuit can be used as the control module 10. In this embodiment, there is no specific limitation.

[0072] In one possible implementation, refer to Figure 3 The charge and discharge module 20 may include a charge and discharge unit 201 and a switch unit 202 .

[0073] The input end of the switch unit 202 is connected to the control end WVM of the charge and discharge module 20 , and the output end of the switch unit 202 is connected to the control end of the charge and discharge unit 201 .

[0074] The voltage input terminal of the charge and discharge unit 201 is used to be connected to a power supply, and the output terminal of the charge and discharge unit 201 is connected to the output terminal of the charge and discharge module 20 .

[0075] The switch unit 202 is used to control the charging or discharging of the charging and discharging unit 201 according to the PWM signal.

[0076] The circuit structure of the switch unit 202 can be flexibly set, and can be any type of switch tube circuit, for example, a triode circuit or a MOS tube circuit, which is not specifically limited in this embodiment.

[0077] In one possible implementation, refer to Figure 3 , the switch unit 202 may include a current limiting resistor R1, a pull-down resistor R2 and an NPN transistor Q1.

[0078] One end of the current limiting resistor R1 is connected to the input end of the switch unit 202 , and the other end of the current limiting resistor R1 is connected to the base of the NPN transistor Q1 and one end of the pull-down resistor R2 , respectively.

[0079] The emitter of the NPN transistor Q1 and the other end of the pull-down resistor R2 are grounded, and the collector of the NPN transistor Q1 is connected to the output end of the switch unit 202 .

[0080] The circuit interface of the charge and discharge unit 201 can be flexibly set, for example, it can be an AC to DC power supply current or a DC power supply circuit, which is not specifically limited in this embodiment.

[0081] In one possible implementation, refer to Figure 3 The charge and discharge unit 201 may include a first voltage-dividing resistor R3, a second voltage-dividing resistor R4, a third voltage-dividing resistor R5, a fourth voltage-dividing resistor R6, a current-limiting resistor R7, an energy storage component C1 and a PNP transistor Q2.

[0082] One end of the first voltage-dividing resistor R3 is used to connect to the power supply, and the other end of the first voltage-dividing resistor R3 is respectively connected to one end of the second voltage-dividing resistor R4, one end of the third voltage-dividing resistor R5 and the emitter of the PNP transistor Q2.

[0083] The other end of the third voltage-dividing resistor R5 is connected to one end of the fourth voltage-dividing resistor R6 and the base of the PNP transistor Q2 respectively.

[0084] The other end of the fourth voltage-dividing resistor R6 is connected to the control end of the charge-discharge unit 201 , and the other end of the second voltage-dividing resistor R4 and the negative electrode of the energy storage component C1 are grounded.

[0085] The collector of the PNP transistor Q2 is connected to one end of the current limiting resistor R7, the other end of the current limiting resistor R7 is respectively connected to the positive electrode of the energy storage component C1 and the output end of the charge and discharge unit 201, and the negative electrode of the energy storage component C1 is grounded.

[0086] It should be noted that the power supply may be a 24V DC power supply or other DC power supplies, which are not specifically limited in this embodiment. The energy storage component may be a charging capacitor.

[0087] Through the above settings, when the PWN signal output by the control module 10 is at a high level, the NPN transistor Q1 is turned on, the first voltage-dividing resistor R3, the second voltage-dividing resistor R4, the third voltage-dividing resistor R5 and the fourth voltage-dividing resistor R6 divide the voltage, the PNP transistor Q2 is turned on, and the power supply starts to discharge the energy storage component. When the PWN signal output by the control module 10 is at a low level, the NPN transistor Q1 and the PNP transistor Q2 are turned off, and the energy storage component discharges. In this way, the duty cycle is output through the PWM output end of the control module 10, and then the wave is expanded by the energy storage capacitor to output a stable and variable control voltage to the mixing valve 50.

[0088] In addition, the switching and charging and discharging are controlled respectively by two switching tubes, the NPN transistor Q1 and the PNP transistor Q2, so that the switching and charging and discharging are isolated from each other, and to a certain extent, mutual interference is avoided to affect the work.

[0089] It should be noted that the above-mentioned NPN transistor Q1 and PNP transistor Q2 can be replaced by switch transistors such as IGBT transistors, MOSS transistors and BJT transistors, and in this embodiment, there is no sole limitation.

[0090] In one possible implementation, refer to Figure 3 The feedback detection module 30 may include a first voltage dividing unit 301 and a first filtering unit 302 .

[0091] The first input end of the first voltage divider unit 301 is used to connect to the detection power supply, the second input end of the first voltage divider power supply is connected to the feedback interface of the mixing valve 50, the output end of the first voltage divider unit 301 is connected to the input end of the first filtering unit 302, and the output end of the first filtering unit 302 is connected to the first input end of the control module 10.

[0092] Furthermore, in order to prevent the voltage entering the first voltage dividing unit 301 from being too large, a voltage stabilizing unit 303 is introduced. Referring to the figure, the feedback detection module 30 may further include a voltage stabilizing unit 303, the voltage stabilizing end of which is connected to the second input end of the first voltage dividing power supply.

[0093] The circuit structure of the voltage stabilizing unit 303 can be flexibly set, for example, it can be a voltage stabilizing device or any voltage stabilizing circuit, which is not specifically limited in this embodiment.

[0094] In a possible implementation, the voltage stabilizing unit 303 may include a voltage stabilizing diode D1, and the anode of the voltage stabilizing diode D1 is connected to the voltage stabilizing end of the voltage stabilizing unit 303, that is, connected to the second input end of the first voltage dividing unit 301 (which can also be understood as the feedback interface connection of the water mixing valve 50). In this way, the voltage stabilizing diode D1 stabilizes the feedback voltage output by the feedback interface of the water mixing valve 50, so that the voltage entering the first voltage dividing unit 301 is a stable voltage, so as to avoid excessive voltage from damaging the first voltage dividing unit 301.

[0095] Reference Figure 3 , the first voltage-dividing unit 301 may include a fifth voltage-dividing resistor R7, a sixth voltage-dividing resistor R8 and a first diode D2. One end of the first voltage-dividing resistor R7 is connected to the second input end of the first voltage-dividing unit 301 (i.e., connected to the feedback interface of the water mixing valve 50), the other end of the first voltage-dividing resistor R7 is respectively connected to the cathode of the first diode D2, one end of the sixth voltage-dividing resistor R8 and the output end of the first voltage-dividing unit 301 (i.e., connected to the input end of the first filtering unit 302), the anode of the first diode D2 is connected to the first input end of the first voltage-dividing unit 301 (i.e., connected to the detection power supply), and the other end of the sixth voltage-dividing resistor R8 is grounded.

[0096] Reference Figure 3 , the first filtering unit 302 may be as follows Figure 3 The RC filter circuit shown.

[0097] Through the above circuit structure, after the mixing valve 50 starts to work, the internal feedback circuit of the mixing valve 50 is turned on, and an electrical signal V2 is output from the feedback interface. The fifth voltage-dividing resistor R7 and the sixth voltage-dividing resistor R8 divide the voltage, and the voltage is filtered by the first filtering unit 302 before entering the first input end of the control module 10. The control module 10 detects the feedback signal to detect whether the opening of the mixing valve 50 is accurate.

[0098] In one possible implementation, refer to Figure 3 The output detection module 40 may include a second voltage dividing unit 401 and a second filtering unit 402 .

[0099] The first input end of the second voltage divider unit 401 is used to connect to the detection power supply, the second input end of the second voltage divider power supply is connected to the output end of the charge and discharge module 20, the output end of the second voltage divider unit 401 is respectively connected to the input end of the second filter unit 402, and the output end of the second filter unit 402 is connected to the output end of the output detection module 40.

[0100] Reference Figure 3, the second voltage-dividing unit 401 may include a seventh voltage-dividing resistor R9, an eighth voltage-dividing resistor R10, and a second diode D3. One end of the seventh voltage-dividing resistor R9 is connected to the second input end of the second voltage-dividing unit 401 (i.e., connected to the output end of the charge-discharge module 20), the other end of the seventh voltage-dividing resistor R9 is respectively connected to the cathode of the second diode D3, one end of the eighth voltage-dividing resistor R10, and the output end of the second voltage-dividing unit 401 (i.e., connected to the input end of the second filtering unit 402), the anode of the second diode D3 is connected to the first input end of the second voltage-dividing unit 401 (i.e., connected to the detection power supply), and the other end of the eighth voltage-dividing resistor R10 is grounded.

[0101] Reference Figure 3 The second filtering unit 402 may be an RC filtering circuit as shown in the figure.

[0102] Through the above circuit structure, after a control voltage is output from the output end of the charge and discharge module 20, the seventh voltage-dividing resistor R9 and the eighth voltage-dividing resistor R10 divide the voltage, and after being filtered by the second filtering unit 402, it enters the second input end of the control module 10. The control module 10 detects the output voltage to detect whether the output voltage of the charge and discharge module 20 is accurate.

[0103] In the water mixing valve control circuit provided in the present application, the charge and discharge module 20 outputs a stable variable control voltage through the duty cycle of the PWM signal output by the control module 10 and the wave spreading effect of the energy storage capacitor. The output detection module 40 inputs the detected output voltage into the control module 10 to detect whether the output voltage is accurate, thereby controlling the opening of the water mixing valve 50, and detects the feedback voltage (i.e., the opening voltage) of the water mixing valve 50 when it is working through the feedback detection module 30, calculates whether the opening of the water mixing valve 50 is accurate, and adjusts the duty cycle of the PWM signal according to the detection result to adjust the opening of the water mixing valve 50 to the target opening, thereby achieving the goal of precise and efficient control.

[0104] Based on the same concept as the above-mentioned water mixing valve control circuit, in a possible implementation manner, a water mixing valve 50 is further provided. The water mixing valve 50 includes the water mixing valve control circuit provided in the above-mentioned implementation manner.

[0105] In the above-mentioned water mixing valve 50, under the action of the control circuit of the water mixing valve 50, the control module 10 outputs a PWM signal corresponding to the target opening to the charge and discharge module 20, and the charge and discharge module 20 outputs a control voltage corresponding to the PWM signal to control the opening of the water mixing valve 50. The feedback detection module 30 collects the opening voltage of the water mixing valve 50 and outputs it to the control module 10. When the actual opening of the water mixing valve 50 indicated by the opening voltage is inconsistent with the target opening, the control module 10 adjusts the duty cycle of the output PWM signal to adjust the opening of the water mixing valve 50 by adjusting the voltage output to the water mixing valve 50, until the actual opening of the water mixing valve 50 is consistent with the target opening. In this way, the opening size of the water mixing valve 50 can be accurately controlled, and the water mixing valve 50 can be controlled to achieve various openings, thereby improving the user experience.

[0106] The specific implementation of the water mixing valve 50 can refer to the implementation of the water mixing valve control circuit mentioned above, which will not be repeated here.

[0107] In a possible implementation, the present application further provides an air conditioner, which includes: a water mixing valve 50, and a water mixing valve control circuit as provided in the above implementation.

[0108] In the above air conditioner, under the action of the control circuit of the water mixing valve 50, the control module 10 outputs a PWM signal corresponding to the target opening to the charge and discharge module 20, and the charge and discharge module 20 outputs a control voltage corresponding to the PWM signal to control the opening of the water mixing valve 50. The feedback detection module 30 collects the opening voltage of the water mixing valve 50 and outputs it to the control module 10. When the actual opening of the water mixing valve 50 indicated by the opening voltage is inconsistent with the target opening, the control module 10 adjusts the duty cycle of the output PWM signal to adjust the opening of the water mixing valve 50 by adjusting the voltage output to the water mixing valve 50 until the actual opening of the water mixing valve 50 is consistent with the target opening. In this way, the opening size of the water mixing valve 50 can be accurately controlled, and the water mixing valve 50 can be controlled to achieve various openings, thereby improving the user experience and air conditioning performance.

[0109] For the specific implementation of the air conditioner, please refer to the implementation of the water mixing valve control circuit mentioned above, which will not be repeated here.

[0110] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application shall be subject to the scope defined by the claims.

Claims

1. A water mixing valve control circuit, characterized in that: It includes a feedback detection module, a charging and discharging module and a control module; The PWM output end of the control module is connected to the control end of the charge and discharge module, and the input end of the charge and discharge module is used to connect to the power supply; The output end of the charging and discharging module is used to connect with the voltage input end of the water mixing valve, the detection end of the feedback detection module is used to connect with the feedback interface of the water mixing valve, and the output end of the feedback detection module is connected with the first input end of the control module; The control module is used to output a PWM signal corresponding to the target opening to the control end of the charge and discharge module; The charging and discharging module is used to output a control voltage to the water mixing valve according to the PWM signal to control the opening of the water mixing valve; The feedback detection module is used to collect the opening voltage of the water mixing valve when it is working, and output the opening voltage to the control module; The control module is further configured to adjust the duty cycle of the PWM signal output to the charge and discharge module when the opening voltage indicates that the actual opening of the water mixing valve is inconsistent with the target opening.

2. The water mixing valve control circuit according to claim 1, characterized in that: The water mixing valve control circuit further comprises an output detection module, wherein a detection end of the output detection module is connected to an output end of the charge and discharge module, and an output end of the output detection circuit is connected to a second input end of the control module; The output detection circuit is used to collect the output voltage of the charging and discharging module and output it to the control module; The control module is used to adjust the duty cycle of the PWM signal output to the charging and discharging module when the output voltage is inconsistent with the target voltage corresponding to the target opening.

3. The water mixing valve control circuit according to claim 1 or 2, characterized in that: The charging and discharging module includes a charging and discharging unit and a switching unit; The input end of the switch unit is connected to the control end of the charge and discharge module, and the output end of the switch unit is connected to the control end of the charge and discharge unit; The voltage input end of the charging and discharging unit is used to be connected to the power supply, and the output end of the charging and discharging unit is connected to the output end of the charging and discharging module; The switch unit is used to control the charging or discharging of the charging and discharging unit according to the PWM signal.

4. The water mixing valve control circuit according to claim 3, characterized in that: The charging and discharging unit includes a first voltage-dividing resistor, a second voltage-dividing resistor, a third voltage-dividing resistor, a fourth voltage-dividing resistor, a current-limiting resistor, an energy storage component and a PNP-type triode; One end of the first voltage-dividing resistor is used to be connected to a power supply, and the other end of the first voltage-dividing resistor is respectively connected to one end of the second voltage-dividing resistor, one end of the third voltage-dividing resistor and the emitter of the PNP transistor; The other end of the third voltage-dividing resistor is respectively connected to one end of the fourth voltage-dividing resistor and the base of the PNP transistor; The other end of the fourth voltage-dividing resistor is connected to the control end of the charge-discharge unit; The collector of the PNP transistor is connected to one end of the current limiting resistor, and the other end of the current limiting resistor is respectively connected to the positive electrode of the energy storage component and the output end of the charge and discharge unit; The other end of the second voltage-dividing resistor and the negative electrode of the energy storage component are grounded.

5. The water mixing valve control circuit according to claim 3, characterized in that: The switch unit includes a current limiting resistor, a pull-down resistor and an NPN transistor; One end of the current limiting resistor is connected to the input end of the switch unit, and the other end of the current limiting resistor is connected to the base of the NPN transistor and one end of the pull-down resistor respectively; The emitter of the NPN transistor and the other end of the pull-down resistor are grounded, and the collector of the NPN transistor is connected to the output end of the switch unit.

6. The water mixing valve control circuit according to claim 1 or 2, characterized in that: The feedback detection module includes a first voltage dividing unit and a first filtering unit; The first input end of the first voltage divider unit is used to connect to the detection power supply, the second input end of the first voltage divider power supply is connected to the feedback interface of the water mixing valve, the output end of the first voltage divider unit is connected to the input end of the first filter unit, and the output end of the first filter unit is connected to the first input end of the control module.

7. The water mixing valve control circuit according to claim 1 or 2, characterized in that: The output detection module includes a second voltage dividing unit and a second filtering unit; The first input end of the second voltage divider unit is used to connect to the detection power supply, the second input end of the second voltage divider power supply is connected to the output end of the charging and discharging module, the output end of the second voltage divider unit is respectively connected to the input end of the second filtering unit, and the output end of the second filtering unit is connected to the output end of the output detection module.

8. The water mixing valve control circuit according to claim 6, characterized in that: The feedback detection module further includes a voltage stabilizing unit, a voltage stabilizing end of the voltage stabilizing unit is connected to the second input end of the first voltage dividing unit.

9. A water mixing valve, characterized in that: The invention comprises a water mixing valve control circuit as claimed in any one of claims 1 to 8.

10. An air conditioner, characterized in that: The invention comprises a water mixing valve and a water mixing valve control circuit as claimed in any one of claims 1 to 8.

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