A thermostat control circuit, a thermostat and a water heater

Abstract

A thermostatic valve control circuit, a thermostatic valve, and a water heater are disclosed. The control circuit includes a parameter detection module for detecting water flow and temperature and converting the detection results into water flow and temperature parameters; a motor drive module for receiving control signals and driving a motor to adjust the valve core position of the thermostatic valve; a main control module electrically connected to the parameter detection module and the motor drive module for receiving water flow and temperature parameters, generating control signals based on the water flow and temperature parameters, and sending them to the motor drive module; and a power supply module electrically connected to the parameter detection module, the main control module, and the motor drive module for supplying power to the parameter detection module, the main control module, and the motor drive module when the external power supply is disconnected. This invention enables the thermostatic valve to complete water flow and temperature detection and valve core adjustment control even when the electric water heater is powered off or the user actively disconnects the power, avoiding the problem of thermostatic function failure due to power outages.

Description

Technical Field

[0001] This invention relates to the field of constant temperature water heater technology, specifically to a constant temperature valve control circuit, a constant temperature valve, and a water heater. Background Technology

[0002] Currently, most storage-type electric water heaters do not come equipped with dedicated thermostatic valves. Users typically can only manually adjust the outlet water temperature via the mixing faucet. When the tap water pressure or inlet water temperature fluctuates, the outlet water temperature can easily change significantly, resulting in sudden changes in temperature, affecting water comfort and even posing safety hazards. To meet users' needs for stable outlet water temperature, some electric water heater manufacturers have begun to launch products equipped with thermostatic valves in recent years. Existing thermostatic valves for electric water heaters can be mainly divided into two categories: mechanical thermostatic valves and electronic thermostatic valves.

[0003] Mechanical thermostatic valves typically use a built-in temperature-sensing element (such as a temperature sensor) to detect the temperature of the mixed water and drive an adjusting piston to change the opening ratio of the hot and cold water channels, thereby achieving constant temperature control. However, the internal piston and water passage gap of this type of thermostatic valve are relatively small, making it susceptible to impurities and scale in the water during long-term use, which can lead to channel blockage or adjustment failure, thus limiting its reliability and service life.

[0004] Electronic thermostatic valves typically use temperature sensors to detect the temperature of the mixed water and a controller to drive a motor to adjust the valve core position, thereby changing the hot and cold water mixing ratio and achieving constant temperature control. Compared to mechanical thermostatic valves, electronic thermostatic valves have significant advantages in adjustment accuracy and anti-clogging capabilities. However, this type of thermostatic valve is highly dependent on an external power source. When the electric water heater is powered off, the electronic thermostatic valve cannot function properly and therefore cannot achieve constant water temperature.

[0005] In practical use, a considerable number of electric water heater users still habitually disconnect the power before using the water heater for safety reasons. In this scenario, the application of existing electronic thermostatic valves is significantly limited, making it difficult to simultaneously achieve both constant temperature performance and the user's electrical safety requirements. Therefore, there is an urgent need for a thermostatic valve and electric water heater system that can maintain constant temperature regulation even when the power is off, to overcome the shortcomings of existing technologies. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies. Firstly, it provides a thermostatic valve control circuit, comprising: The parameter detection module is used to detect water flow rate and temperature, and convert the detection results into water flow rate parameters and temperature parameters. The motor drive module is used to receive control signals and drive the motor to adjust the valve core position of the thermostatic valve. The main control module is electrically connected to the parameter detection module and the motor drive module, respectively, and is used to receive the water flow parameters and the temperature parameters, and generate control signals based on the water flow parameters and the temperature parameters and send them to the motor drive module; The power supply module is electrically connected to the parameter detection module, the main control module, and the motor drive module, and is used to provide operating power to the parameter detection module, the main control module, and the motor drive module when the external power supply is disconnected.

[0007] In one embodiment, the power supply module includes a boost unit, a buck unit, a charging management unit, and a charging switch unit. The input terminal of the boost unit is connected to a rechargeable battery, and the output terminal of the boost unit is connected to the input terminal of the buck unit and the power supply terminal of the motor drive module. The output terminal of the buck unit is connected to the input terminal of the charging switch unit, the parameter detection module, the motor drive module, and the main control module. The output terminal of the charging switch unit is connected to the charging management unit. The boost unit is used to increase the voltage output by the rechargeable battery when the external power supply is disconnected, so as to meet the drive voltage requirements of the motor drive module. The step-down unit is used to step down and regulate the voltage output by the boost unit in order to provide working power to the parameter detection module, the main control module and the charging switch unit; The charging management unit is used to manage the charging of the rechargeable battery when an external power source is available. The charging switch unit is used to selectively connect or disconnect the electrical connection between the charging management unit and the rechargeable battery under the control of the main control module.

[0008] In one embodiment, the charging switch unit includes a resistor R31, a resistor R32, and a switching transistor U1. The switching transistor U1 is a MOSFET. One end of the resistor R31 is connected to the control terminal of the charging management unit, and the other end of the resistor R31 is connected to one end of the resistor R32 and the gate of the switching transistor U1. The drain of the switching transistor U1 is connected to the output terminal of the buck unit and the other end of the resistor R32, and the source of the switching transistor U1 is connected to the feedback terminal of the charging management unit.

[0009] In one embodiment, the boost unit includes an inductor L3, resistors R33, R34, and R35, capacitors C23 and C24, capacitor EC6 and EC7, diodes D1 and D2, and a boost chip U2. One end of resistor R33 is connected to the rechargeable battery, the sixth terminal of the boost chip U2, and one end of capacitor EC6. The other end of capacitor EC6 is grounded. The other end of resistor R33 is connected to the first, seventh, and eighth terminals of the boost chip U2. The fifth terminal of the boost chip U2 is connected to one end of resistor R34. One end of resistor R35 and the other end of resistor R34 are grounded. The other end of resistor R35 is connected to one end of inductor L3, one end of capacitor EC7, one end of capacitor C24, and the anode of diode D2. The cathode of diode D2 is connected to the input terminal of the buck unit. The other end of capacitor EC7 and capacitor C24 are grounded. The other end of inductor L3 is connected to the second terminal of boost chip U2 and the cathode of the first diode. The anode of the first diode is grounded. The third terminal of boost chip U2 is connected to the fourth terminal of boost chip U2 and the ground terminal through capacitor C23.

[0010] In one embodiment, the buck unit includes a buck chip IC3, capacitors C6, C14, EC3, and EC4. One end of capacitor EC4 is connected to one end of capacitor C6, the output terminal of the boost unit, and the input terminal of buck chip IC3. The other end of capacitor EC4 is connected to the other end of capacitor C6, the ground terminal of buck chip IC3, the ground terminal, one end of capacitor C14, and one end of capacitor EC3. The other end of capacitor C14 is connected to the other end of capacitor EC3 and the output terminal of buck chip IC3.

[0011] In one embodiment, the parameter detection module further includes a water flow detection unit and a temperature detection unit. The water flow detection unit is electrically connected to the main control module and is used to detect the water flow information in the thermostatic valve and convert it into the water flow parameter, which is then sent to the main control module. The temperature detection unit is electrically connected to the main control module and is used to detect the water temperature information in the thermostatic valve and convert it into the temperature parameter, which is then sent to the main control module.

[0012] In one embodiment, a display module is further included. The display module is electrically connected to the main control module and is used to receive display data sent by the main control module and display the working status, temperature information and / or abnormal prompt information of the thermostatic valve.

[0013] In one embodiment, a serial port module is further included, which is electrically connected to the main control module and is used for data communication between the main control module and an external display device, debugging equipment, or upper control unit.

[0014] Secondly, a thermostatic valve is provided, including a valve body, a motor, a rechargeable battery, and a circuit board. The valve body includes a rotatable valve core, and the circuit board includes the thermostatic valve control circuit described above. The motor is installed inside the valve body and is connected to the valve core for driving the valve core to adjust the mixing ratio of hot and cold water. The parameter detection module is set inside the valve body for collecting the water flow and temperature of the thermostatic valve. The valve body includes interconnected hot water outlet, hot water inlet, cold water outlet, and cold water inlet. The temperature detection unit is located at the hot water outlet to collect the outlet water temperature of the thermostatic valve. The cold water inlet is connected to the municipal water supply network to provide cold water to the thermostatic valve. The cold water outlet is connected to the inlet of the water heater to inject cold water into the water heater. The hot water inlet is connected to the outlet of the water heater to provide hot water to the thermostatic valve. The hot water outlet is connected to the user end to output constant-temperature mixed water.

[0015] Thirdly, a water heater is provided, including the thermostatic valve as described above. The water heater has an inner tank, and the inner tank contains an electric heating element, an inlet pipe, and an outlet pipe. The cold water inlet of the thermostatic valve is connected to the tap water network to provide cold water to the thermostatic valve. The cold water outlet of the thermostatic valve is connected to the inlet pipe of the water heater to inject cold water into the inner tank of the water heater. The hot water inlet of the thermostatic valve is connected to the outlet pipe of the water heater to introduce the heated water from the water heater into the thermostatic valve. The hot water outlet of the thermostatic valve is connected to the user end to output temperature-controlled mixed water to the user end.

[0016] Compared with the prior art, the thermostatic valve control circuit provided by the present invention introduces a power supply module that can still supply power to each module when the external power is disconnected, in addition to the parameter detection module, motor drive module and main control module. This enables the thermostatic valve to still complete the detection of water flow and temperature and the adjustment and control of the valve core when the electric water heater is powered off or the user actively cuts off the power, thereby avoiding the problem of thermostatic function failure due to power failure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a circuit structure block diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the circuit principle of the water flow detection unit of the present invention; Figure 3 This is a schematic diagram of the circuit principle of the temperature detection unit of the present invention; Figure 4 This is a schematic diagram of the circuit principle of the motor drive module of the present invention; Figure 5 This is a schematic diagram of the circuit principle of the main control module of the present invention; Figure 6 This is a schematic diagram of the circuit principle of the boost unit of the present invention; Figure 7 This is a schematic diagram of the circuit principle of the step-down unit of the present invention; Figure 8 This is a schematic diagram of the circuit principle of the charging management unit of the present invention; Figure 9 This is a schematic diagram of the circuit principle of the charging switch unit of the present invention; Figure 10 This is a schematic diagram of the circuit principle of the display module of the present invention; Figure 11 This is a schematic diagram of the circuit principle of the serial port module of the present invention; Figure 12 This is a schematic diagram illustrating the structural principle of the thermostatic valve and water heater of the present invention.

[0019] Figure label: 100. Parameter detection module; 110. Water flow detection unit; 120. Temperature detection unit; 200. Motor drive module; 300. Main control module; 400 Power supply module; 410 Boost unit; 420 Buck unit; 430 Charging management unit; 440 Charging switch unit; 500. Display module; 600, Serial port module; 1. Valve body; 11. Valve core; 12. Hot water outlet of valve body; 13. Hot water inlet of valve body; 14. Cold water outlet of valve body; 15. Cold water inlet of valve body; 2. Electric motor; 3. Temperature sensor; 4. Thermostatic valve controller; 5. Water heater; 51. Inner tank; 52. Heating element; 53. Inlet pipe; 54. Outlet pipe. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] Reference Figure 1 The present invention provides a thermostatic valve control circuit 4, comprising: The parameter detection module 100 is used to detect water flow rate and temperature, and convert the detection results into water flow rate parameters and temperature parameters. The motor drive module 200 is used to receive control signals and drive the motor 2 to adjust the position of the valve core 11 of the thermostatic valve. The main control module 300 is electrically connected to the parameter detection module 100 and the motor drive module 200, respectively, and is used to receive the water flow parameter and the temperature parameter, and generate a control signal based on the water flow parameter and the temperature parameter and send it to the motor drive module 200. The temperature parameter is used to determine the adjustment direction of the valve core 11, and the water flow parameter is used to determine the adjustment speed or adjustment step of the valve core 11. The power supply module 400 is electrically connected to the parameter detection module 100, the main control module 300, and the motor drive module 200, and is used to provide working power to the parameter detection module 100, the main control module 300, and the motor drive module 200 when the external power supply is disconnected.

[0025] Compared with the prior art, the thermostatic valve control circuit 4 provided in this embodiment introduces a power supply module 400 that can still supply power to each module when the external power is disconnected, in addition to the parameter detection module 100, motor drive module 200 and main control module 300. This enables the thermostatic valve to still complete the detection of water flow and temperature and the adjustment and control of valve core 11 when the electric water heater 5 is powered off or the user actively cuts off the power, thereby avoiding the problem of thermostatic function failure due to power failure.

[0026] In one embodiment, the parameter detection module 100 further includes a water flow detection unit 110 and a temperature detection unit 120. The water flow detection unit 110 is electrically connected to the main control module 300 and is used to detect the water flow information in the thermostatic valve and convert it into the water flow parameter, which is then sent to the main control module 300. The temperature detection unit 120 is electrically connected to the main control module 300 and is used to detect the water temperature information in the thermostatic valve and convert it into the temperature parameter, which is then sent to the main control module 300.

[0027] Specifically, refer to Figure 2 , Figure 2This is a schematic diagram of the circuit principle of the water flow detection unit 110 of the present invention. The water flow detection unit 110 includes a water flow sensor interface CN4, resistors R13, R14, R15, and R16, capacitors C7 and C8, and a transistor Q1. The water flow sensor interface CN4 is used to connect to an external water flow sensor. One end of CN4 is connected to the power supply voltage, and the other end is connected to one end of resistor R15 through resistor R14. The other end of resistor R15 is connected to the base of transistor Q1. One end of capacitor C8 is connected to the connection node between resistor R15 and the base of transistor Q1, and the other end of capacitor C8 is grounded. One end of resistor R16 is connected to the base of transistor Q1, and the other end is grounded, used to pull down the base potential. The emitter of transistor Q1 is grounded, and its collector is connected to the power supply voltage through resistor R13. A water flow signal terminal (waterflow) is led out from the collector, and the water flow signal terminal (waterflow) is also grounded through capacitor C7. During operation, the water flow sensor outputs a pulse signal when it detects water flow. This pulse signal is input via interface CN4, and is then current-limited and level-adjusted by resistors R14 and R15 before being applied to the base of transistor Q1. Capacitor C8 and resistor R15 together form a filter network to suppress high-frequency interference and glitches. Resistor R16 ensures that transistor Q1 is in the off state when there is no water flow signal input. When the base receives a valid pulse signal, transistor Q1 turns on, and its collector potential changes, thus generating a pulse signal corresponding to the water flow at the waterflow terminal. Resistor R13 is used to pull up the collector, and capacitor C7 is used to filter and stabilize the output signal. The main control module 300 detects and calculates the water flow by acquiring and counting the pulse signal at the waterflow terminal. The main control module 300 can also adaptively control the adjustment speed or adjustment step of valve core 11 based on the water flow parameters to avoid fluctuations in outlet water temperature under low flow or sudden water flow conditions.

[0028] Specifically, refer to Figure 3 , Figure 3 This is a schematic diagram of the circuit principle of the temperature detection unit 120 of the present invention. The temperature detection unit 120 includes a temperature sensor 3 interface CN5, resistors R17, R18, R19, and R20, capacitors C11 and C12. The temperature sensor 3 interface CN5 is used to connect to an external temperature sensor 3, which is a thermistor sensor. One end of the thermistor sensor is connected to the power supply voltage through the interface CN5, and the other end is connected to the inlet water temperature sampling branch and the outlet water temperature sampling branch, respectively.

[0029] In the inlet water temperature sampling branch, the signal terminal of temperature sensor 3 is connected to the inlet water temperature signal terminal NTC-IN through resistor R17. One end of resistor R18 is connected to the signal node of temperature sensor 3, and the other end is grounded. One end of capacitor C11 is connected between resistor R17 and the signal node of temperature sensor 3, and the other end is grounded. Resistor R18 and temperature sensor 3 together form a voltage divider circuit, which is used to convert temperature changes into corresponding voltage signals. Capacitor C11 is used to filter the inlet water temperature signal.

[0030] In the outlet water temperature sampling branch, the signal terminal of temperature sensor 3 is connected to the outlet water temperature signal terminal NTC-OUT through resistor R19. One end of resistor R20 is connected to the signal node of temperature sensor 3, and the other end is grounded. One end of capacitor C12 is connected between resistor R19 and the signal node of temperature sensor 3, and the other end is grounded. Resistor R20 and temperature sensor 3 together form a voltage divider circuit, which is used to convert the outlet water temperature change into a corresponding voltage signal. Capacitor C12 is used to filter the outlet water temperature signal.

[0031] During operation, the resistance of temperature sensor 3 changes with the water temperature, causing corresponding changes in the voltage divider in the inlet and outlet water temperature sampling branches. The inlet water temperature signal terminal NTC-IN and the outlet water temperature signal terminal NTC-OUT output analog voltage signals corresponding to the inlet and outlet water temperatures, respectively. The main control module 300 acquires and processes the NTC-IN and NTC-OUT signals to detect the inlet and outlet water temperatures, providing temperature parameters for adjusting the valve core 11 of the thermostatic valve. Based on these inlet and outlet water temperature parameters, the main control module 300 can determine the current hot and cold water mixing state in real time and generate a valve core 11 adjustment control signal accordingly to achieve closed-loop control of the outlet water temperature.

[0032] Specifically, refer to Figure 4 , Figure 4This is a schematic diagram of the circuit principle of the motor drive module 200 of the present invention. The motor drive module 200 includes a stepper motor 2 interface CN3, a motor 2 driver chip IC1, resistors R9-R12, resistor R24, resistor R25, capacitors C15, C9, C10, and electrolytic capacitor EC1. The motor 2 driver chip IC1 is a multi-channel Darlington transistor array driver chip, with its input terminal electrically connected to the main control module 300 and its output terminal electrically connected to the stepper motor 2 interface CN3. Multiple input terminals IN1-IN4 of the motor 2 driver chip IC1 are electrically connected to the control signal terminals of the main control module 300 through corresponding current-limiting resistors R9, R10, R11, and R12, respectively, for receiving motor 2 control signals output by the main control module 300. Multiple output terminals OUT4-OUT7 of the motor 2 driver chip IC1 are connected to the phase winding terminals A, B, C, and D of the stepper motor 2, respectively, forming a multi-phase drive structure for the stepper motor 2. The power supply terminal VDD of the motor 2 driver chip IC1 is connected to the motor 2 driver power supply, and the ground terminal VSS is grounded. The stepper motor 2 interface CN3 is used to connect to an external stepper motor 2, and its corresponding terminals are connected to the positive and negative phase winding terminals of the stepper motor 2, respectively. Resistors R24 and R25 are connected to the stepout output terminal of the main control module 300 for current limiting and level matching of the control signal. Capacitor C15 works in conjunction with resistor R25 to filter and debouncing the stepper control signal. Electrolytic capacitors EC1, C9, and C10 are connected in parallel between the motor 2 driver power supply and ground to filter and regulate the motor 2 driver power supply, thereby suppressing voltage fluctuations and interference generated during the operation of the stepper motor 2.

[0033] During operation, the main control module 300 generates a control signal for the stepper motor 2 based on the water flow and temperature parameters, and applies it to the motor 2 driver chip IC1 through the input terminal. The motor 2 driver chip IC1 amplifies the control signal and drives each phase winding of the stepper motor 2 to switch on and off in a predetermined phase sequence, causing the stepper motor 2 to rotate in a set direction and step angle, thereby changing the position of the thermostatic valve core 11 and adjusting the mixing ratio of hot and cold water. Through the precise drive control of the motor drive module 200, the rotation angle and response speed of the valve core 11 can be matched with the changes in water flow and temperature, thereby improving the adjustment accuracy and response stability of the thermostatic valve under dynamic water use conditions.

[0034] Specifically, refer to Figure 5 , Figure 5This is a schematic diagram of the circuit principle of the main control module 300 of the present invention. The main control module 300 includes a main control chip IC2, inductors L1 and L2, resistor R22, capacitors C16, C17, C18, and C19, electrolytic capacitor EC2, and indicator LED1. The main control chip IC2 is a microcontroller unit used to perform logic operations, signal processing, and control output of the thermostatic valve control circuit 4. The power supply terminal VDD of the main control chip IC2 is connected to the power supply voltage through inductors L1 and L2. Inductors L1 and L2, together with capacitors C16, C17, C18, and electrolytic capacitor EC2, form a power supply filter network to filter and decouple the input power supply, thereby reducing the impact of power supply noise on the normal operation of the main control chip IC2. The ground terminal VSS of the main control chip IC2 is grounded, and capacitor C19 is placed between the power supply terminal and ground of the main control chip IC2 to further stabilize the chip's operating voltage. The main control chip IC2 has multiple input terminals that are electrically connected to the output terminals of the parameter detection module 100, including the water flow signal terminal (waterflow) and the inlet water temperature signal terminal (NTC-IN), outlet water temperature signal terminal (NTC-OUT), and cold end temperature signal terminal (NTC-COLD) of the temperature detection unit 120, for receiving water flow parameters and temperature parameters; the main control chip IC2 has multiple output terminals that are electrically connected to the control terminals A, B, C, D and the step control signal terminal (stepout) of the motor drive module 200, for outputting valve core 11 adjustment control signals to the motor drive module 200.

[0035] In this embodiment, the cold end temperature signal terminal NTC-COLD is used to collect the temperature of the cold water channel or the ambient side, and its structure is the same as the thermistor sampling method in the temperature detection unit 120.

[0036] In addition, the main control chip IC2 is electrically connected to the display module 500 via serial port signal terminals TXD-DISP and RXD-DISP for data communication; and is electrically connected to the power supply module 400 via battery-related signal terminals CONBATPOWER, BMSDONE, BMSCHRG, and NTCBAT for acquiring battery status information and controlling or monitoring the charging process. The resistor R22 is connected in series with the indicator LED1 and then to the power supply voltage to indicate the power-on or operating status of the main control module 300.

[0037] During operation, the main control chip IC2 collects and processes water flow and temperature parameters from the parameter detection module 100, and generates corresponding motor 2 control signals based on the preset thermostatic control logic. The motor drive module 200 drives the stepper motor 2 to adjust the position of the thermostatic valve core 11. At the same time, the main control chip IC2 monitors the working status of the power supply module 400 and maintains the basic control functions of the system when the external power is disconnected, thereby realizing the stable operation of the thermostatic valve under power failure conditions. Thus, the main control module 300 constitutes the core control unit of the thermostatic valve control circuit 4, realizing unified coordination and comprehensive control of water flow detection, temperature detection, motor 2 drive and power supply status.

[0038] It should be noted that the main control module 300 is based on a preset constant temperature control strategy, which comprehensively judges the collected inlet water temperature, outlet water temperature and water flow parameters, and determines the rotation direction and number of rotation steps of the stepper motor 2 according to the deviation direction and amplitude. The constant temperature control strategy can be configured with parameters according to different usage scenarios, and is not a fixed threshold control.

[0039] In one embodiment, the power supply module 400 includes a boost unit 410, a buck unit 420, a charging management unit 430, and a charging switch unit 440. The input terminal of the boost unit 410 is connected to a rechargeable battery, and the output terminal of the boost unit 410 is connected to the input terminal of the buck unit 420 and the power supply terminal of the motor drive module 200. The output terminal of the buck unit 420 is connected to the input terminal of the charging switch unit 440, the parameter detection module 100, the motor drive module 200, and the main control module 300. The output terminal of the charging switch unit 440 is connected to the charging management unit 430. The boost unit 410 is used to increase the voltage output by the rechargeable battery when the external power supply is disconnected, so as to meet the driving voltage requirements of the motor drive module 200. The step-down unit 420 is used to step down and regulate the voltage output by the boost unit 410 in order to provide working power to the parameter detection module 100, the main control module 300 and the charging switch unit 440. The charging management unit 430 is used to manage the charging of the rechargeable battery when an external power source is available. The charging switch unit 440 is used to selectively connect or disconnect the electrical connection between the charging management unit 430 and the rechargeable battery under the control of the main control module 300.

[0040] Reference Figure 6In one embodiment, the boost unit 410 includes an inductor L3, resistors R33, R34, and R35, capacitors C23 and C24, capacitors EC6 and EC7, diodes D1 and D2, and a boost chip U2. One end of resistor R33 is connected to the rechargeable battery, the sixth terminal of the boost chip U2, and one end of capacitor EC6. The other end of capacitor EC6 is grounded. The other end of resistor R33 is connected to the first, seventh, and eighth terminals of the boost chip U2. The fifth terminal of the boost chip U2 is connected to one end of resistor R34. One end of resistor R35 and the other end of resistor R34 are grounded. The other end of resistor R35 is connected to one end of inductor L3, one end of capacitor EC7, one end of capacitor C24, and the anode of diode D2. The cathode of diode D2 is connected to the input terminal of buck unit 420. The other end of capacitor EC7 and capacitor C24 are grounded. The other end of inductor L3 is connected to the second terminal of boost chip U2 and the cathode of the first diode. The anode of the first diode is grounded. The third terminal of boost chip U2 is connected to the fourth terminal of boost chip U2 and the ground terminal through capacitor C23. When the external power supply is disconnected, the rechargeable battery provides input voltage to boost unit 410. Under the action of its internal oscillation and control circuit, boost chip U2 periodically controls the conduction and cutoff of inductor L3 connected to it, so that inductor L3 stores energy during the conduction phase and releases the stored energy to the output side during the cutoff phase. The released energy is rectified by diode D2 and output to the input of buck unit 420, thereby boosting the battery voltage. Resistors R34 and R35 form a feedback voltage divider network to feed the output voltage back to boost chip U2, so that boost chip U2 can adjust the duty cycle according to the feedback signal to stabilize the boost output voltage. Resistor R33 is used for current limiting and sampling control of the input current, and capacitor EC6 is used to filter the battery input voltage and suppress input voltage fluctuations.

[0041] In addition, capacitors EC7 and C24 are used to filter and store energy in the boosted output voltage to reduce output ripple and improve power supply stability; diode D1 is used to clamp or protect the relevant ports of the boost chip U2 to prevent abnormal voltage from affecting the circuit; capacitor C23 is used to provide timing or compensation functions for the boost chip U2 to ensure the stability and reliability of the boost process. Through the above operation, the boost unit 410 can provide a stable boost power supply to the subsequent circuit under battery power conditions, meeting the operating requirements of the thermostatic valve control circuit 4 under power failure conditions.

[0042] Reference Figure 7In one embodiment, the step-down unit 420 includes a step-down chip IC3, capacitors C6, C14, EC3, and EC4. One end of capacitor EC4 is connected to one end of capacitor C6, the output terminal of the boost unit 410, and the input terminal of the step-down chip IC3. The other end of capacitor EC4 is connected to the other end of capacitor C6, the ground terminal of the step-down chip IC3, the ground terminal, one end of capacitor C14, and one end of capacitor EC3. The other end of capacitor C14 is connected to the other end of capacitor EC3 and the output terminal of the step-down chip IC3. During operation, the step-down unit 420 is used to step down and regulate the higher voltage output by the boost unit 410 to provide a stable power supply to the main control module 300, the parameter detection module 100, and other low-voltage power-consuming units. The voltage output from the boost unit 410 is filtered on the input side by capacitors EC4 and C6 before being fed into the input terminal of the buck chip IC3. This reduces ripple and transient interference in the input voltage, ensuring stable operation of the buck chip IC3. Under the action of its internal voltage regulation control circuit, the buck chip IC3 performs linear or regulated conversion on the input voltage and outputs a preset stable low-voltage power supply. Capacitors C14 and EC3 are located at the output terminal of the buck chip IC3 to filter and store energy in the stepped-down output voltage, suppressing output voltage fluctuations and improving power supply stability and load transient response. The buck unit 420 reliably converts the voltage output from the boost unit 410 into a low-voltage power supply suitable for the operation of the main control module 300 and related functional modules, thus ensuring stable operation of the thermostatic valve control circuit 4 even under battery power or external power failure conditions.

[0043] Reference Figure 8In one embodiment, the charging management unit 430 includes a charging management chip IC4, resistors R26, R27, R28, and R29, capacitors C20, C21, and EC5, and a battery interface CN7. The charging management chip IC4 controls and manages the charging process of the rechargeable battery, and the battery interface CN7 is used for electrical connection to the rechargeable battery. The power input terminal VIN of the charging management chip IC4 is connected to an external charging power supply. One end of capacitor EC5 is connected to the power input terminal VIN, and the other end is grounded, used for filtering and decoupling the input power supply. The battery terminal BAT of the charging management chip IC4 is connected to the rechargeable battery through the battery interface CN7, used to output charging current to the rechargeable battery. Capacitors C20 and C21 are respectively connected between the battery terminal BAT and ground, used for filtering and stabilizing the battery terminal voltage. The current setting terminal ISET of the charging management chip IC4 is connected to the power input terminal VIN via resistor R26, and is used to set the charging current of the charging management chip IC4. The feedback terminal FB of the charging management chip IC4 is connected to the battery terminal BAT via a voltage divider network composed of resistors R28 and R29, and is used to detect the battery voltage and provide a feedback signal to the charging management chip IC4. The temperature detection terminal TEMP of the charging management chip IC4 is connected to the battery temperature detection node via resistor R27, and is used to receive the battery temperature signal. The status output terminals BMS_DONE and BMS_CHRG of the charging management chip IC4 are electrically connected to the main control module 300, respectively, and are used to output charging completion status signals and charging in progress status signals. When an external charging power supply is connected, the charging management chip IC4 detects the input power supply and outputs a charging current to the rechargeable battery when the charging conditions are met; the magnitude of the charging current is determined by the resistor R26 connected to the current setting terminal ISET. During charging, the charging management chip IC4 monitors the battery terminal voltage in real time via the feedback terminal FB and adjusts the charging process according to the detected voltage changes to achieve constant current or constant voltage charging control of the battery. Simultaneously, the charging management chip IC4 receives the battery temperature signal via the temperature detection terminal TEMP. When an abnormal battery temperature is detected, the charging process is limited or terminated to improve charging safety. The charging status is output to the main control module 300 via the BMS_DONE and BMS_CHRG signal terminals, enabling the main control module 300 to obtain the battery charging status in real time. Through the above methods, the charging management unit 430 achieves safe and stable charging management of the rechargeable battery.

[0044] Reference Figure 9In one embodiment, the charging switch unit 440 includes resistors R31 and R32 and a switching transistor U1, which is a MOSFET. One end of resistor R31 is connected to the control terminal of the charging management unit 430, and the other end of resistor R31 is connected to one end of resistor R32 and the gate of the switching transistor U1. The drain of the switching transistor U1 is connected to the output terminal of the buck unit 420 and the other end of resistor R32, and the source of the switching transistor U1 is connected to the feedback terminal of the charging management unit 430. When an external power supply is connected and the charging conditions are met, the control terminal of the charging management unit 430 outputs a control signal, which biases the gate of the switching transistor U1 through resistors R31 and R32, turning on the switching transistor U1. This establishes an electrical connection between the working power output of the buck unit 420 and the charging management unit 430, enabling the charging management unit 430 to manage the charging of the rechargeable battery. When the external power supply is disconnected or the main control module 300 determines that charging the rechargeable battery is not required, the control terminal of the charging management unit 430 stops outputting control signals or outputs a shutdown signal. This, along with resistors R31 and R32, causes the switching transistor U1 to turn off, thereby cutting off the electrical connection between the charging management unit 430 and the output terminal of the step-down unit 420. This prevents the battery from reverse discharging through the charging management unit 430 or generating unnecessary energy loss. The charging switch unit 440 can control the switching of the charging path under different operating states, ensuring that the charging management unit 430 only operates when needed. This improves the power supply safety and system reliability of the entire thermostatic valve control circuit 4 under power-off and power-on scenarios.

[0045] It should be noted that when the external power supply is disconnected, the charging management unit 430 is isolated from the power supply path through the charging switch unit 440 and does not participate in the power supply process. In one embodiment, a display module 500 is further included. The display module 500 is electrically connected to the main control module 300 and is used to receive display data sent by the main control module 300 and display the working status, temperature information and / or abnormal prompt information of the thermostatic valve.

[0046] Reference Figure 10Specifically, the display module 500 includes connector CN1, resistors R1, R2, R3, and R6, and capacitors C2 and C3. Connector CN1 is used for electrical connection with the display board or the host control device to transmit display data and power supply signals. The first pin of connector CN1 is grounded, the second and third pins are used for receiving and transmitting serial signals, respectively, and the fourth pin is used to receive external power supply voltage. The serial port transmit signal TXD-DISP and serial port receive signal RXD-DISP of the host control module 300 are connected to the corresponding pins of connector CN1 through resistors R3 and R6, respectively, to transmit serial communication signals. Resistors R1 and R2 are connected to the power supply line to limit or divide the power supply voltage of the display module 500. Capacitors C2 and C3 are connected between the serial signal line and ground to filter the serial signal and suppress high-frequency interference. The main control module 300 sends display data to the display module 500 via a serial port. This display data is transmitted to connector CN1 via the serial signal line and received and parsed by the display module 500. Resistors R3 and R6 limit the current and match the impedance of the serial port signal, ensuring the stability of the communication signal. Capacitors C2 and C3 filter out transient interference and high-frequency noise in the serial port signal, improving communication reliability. After receiving the display data, the display module 500 displays the operating status of the thermostatic valve, the current water temperature, and any abnormal prompts, allowing the user to intuitively understand the operating status of the thermostatic valve.

[0047] In one embodiment, a serial port module 600 is further included. The serial port module 600 is electrically connected to the main control module 300 and is used for data communication between the main control module 300 and an external display device, debugging equipment, or upper control unit.

[0048] Reference Figure 11Specifically, the serial port module 600 includes connector CN2, resistors R4, R5, R7, and R8, and capacitors C4 and C5. Connector CN2 is used for electrical connection with an external display device, debugging equipment, or upper-level control unit to output serial communication signals and power supply signals. The serial port receive signal RXD-SN and serial port transmit signal TXD-SN of the main control module 300 are respectively connected to one end of resistors R5 and R4, and the other end of resistors R4 and R5 are connected to the power supply terminal for pull-up processing of the serial port signals. Resistors R7 and R8 are connected in series between the main control module 300 and connector CN2 for current limiting and impedance matching of the serial port signals. Capacitors C4 and C5 are respectively connected between the serial port signal line and ground for filtering the serial port signals. One pin of connector CN2 is connected to the power supply terminal, another pin is connected to the ground terminal, and the remaining pins are connected to the serial port signal line. The main control module 300 sends operating status data, temperature parameters, fault information, or debugging information to external display devices, debugging equipment, or upper-level control units through the serial port module 600. It can also receive parameter configuration commands or control commands from external devices. Resistors R4 and R5 act as pull-up stabilizers for the serial port signal, ensuring a stable level in idle states. Resistors R7 and R8 limit signal current and improve signal integrity. Capacitors C4 and C5 suppress high-frequency interference and transient noise during serial communication, thereby improving data communication reliability. Through these methods, the serial port module 600 achieves stable and secure data communication between the main control module 300 and external devices, facilitating status display, parameter configuration, and maintenance debugging of the thermostatic valve system.

[0049] Secondly, a thermostatic valve is provided, including a valve body 1, a motor 2, a rechargeable battery and a circuit board. The valve body 1 includes a rotatable valve core 11, and the circuit board includes the thermostatic valve control circuit 4 as described above. The motor 2 is installed inside the valve body 1 and is connected to the valve core 11 for driving the valve core 11 to adjust the mixing ratio of hot and cold water. The parameter detection module 100 is installed inside the valve body 1 and is used to collect the water flow and temperature of the thermostatic valve. The valve body 1 includes a hot water outlet 12, a hot water inlet 13, a cold water outlet 14, and a cold water inlet 15 that are interconnected. The temperature detection unit 120 is installed at the hot water outlet 12 to collect the outlet temperature of the thermostatic valve. The cold water inlet is connected to the tap water network to provide cold water to the thermostatic valve. The cold water outlet 14 is connected to the inlet of the water heater 5 to inject cold water into the water heater 5. The hot water inlet 13 is connected to the outlet of the water heater 5 to provide hot water to the thermostatic valve. The hot water outlet 12 is connected to the user end to output constant temperature mixed water to the user end.

[0050] Thirdly, a water heater 5 is provided, including the thermostatic valve as described above. The water heater 5 has an inner tank 51, and the inner tank 51 has an electric heating element 52, an inlet pipe 53, and an outlet pipe 54. The cold water inlet of the thermostatic valve body is connected to the tap water network to provide cold water to the thermostatic valve. The cold water outlet 14 of the thermostatic valve body is connected to the inlet pipe 53 of the water heater 5 to inject cold water into the inner tank 51 of the water heater 5. The hot water inlet 13 of the thermostatic valve body is connected to the outlet pipe 54 of the water heater 5 to introduce the hot water heated by the water heater 5 into the thermostatic valve. The hot water outlet 12 of the thermostatic valve body is connected to the user end to output constant temperature mixed water to the user end.

[0051] The thermostatic valve of this invention is installed between the water heater 5 and the water user, and is used to mix and regulate the hot water from the water heater 5 with the cold water supplied by the municipal water network, so as to output a constant-temperature mixed water to the water user. Figure 12 As shown, the thermostatic valve includes a valve body 11, a motor 22, a valve core 113, a thermostatic valve control circuit 44, and a rechargeable battery (not shown). The valve body 11 forms a hot and cold water mixing chamber, and the valve core 113 is rotatably disposed within the mixing chamber to adjust the opening ratio of the hot water channel and the cold water channel. The motor 22 is installed inside the valve body 11 and connected to the valve core 113 via a transmission structure to drive the valve core 113 to rotate under the control of the thermostatic valve control circuit 44. The valve body 11 includes a hot water inlet 1313, a hot water outlet 1214, a cold water inlet 15, and a cold water outlet 1411. The valve body cold water inlet 15 is connected to the tap water network to provide cold water to the thermostatic valve; the valve body cold water outlet 1411 is connected to the water inlet pipe 53 of the water heater 5 to replenish cold water to the inner tank 51 of the water heater 5; the valve body hot water inlet 1313 is connected to the water outlet pipe 54 of the water heater 5 to receive hot water heated by the water heater 5; and the valve body hot water outlet 1214 is connected to the water user to output constant temperature water after mixing and adjustment to the water user.

[0052] In this embodiment, the temperature detection unit 120 is located near the hot water outlet 1214 of the valve body to collect the outlet water temperature of the thermostatic valve in real time; the water flow detection unit 110 is located in the outlet channel inside the valve body to collect the outlet water flow information of the thermostatic valve. The collected temperature signal and water flow signal are transmitted to the thermostatic valve control circuit 44, and the main control module 300 judges the current outlet water status.

[0053] When the user turns on the water supply, cold water enters the thermostatic valve through the cold water inlet 15 of the valve body and is then distributed to the water heater 5 and the mixing chamber. The water heater 5 heats the incoming cold water and then sends the hot water back to the thermostatic valve through the hot water inlet 1313 of the valve body. The thermostatic valve control circuit 44 controls the motor 22 to rotate in the forward or reverse direction based on the parameters collected by the temperature detection unit 120 and the water flow detection unit 110, thereby driving the valve core 113 to adjust the opening ratio of the cold and hot water channels, so that the temperature of the mixed outlet water is stabilized within the set range.

[0054] When the water heater 5 loses power or the user actively disconnects the external power supply, the rechargeable battery continues to supply power to the main control module 300, motor drive module 200, and parameter detection module 100 through the power supply module 400 in the thermostatic valve control circuit 4. This allows the thermostatic valve to still perform temperature detection and valve core 11 adjustment, preventing drastic fluctuations in the outlet water temperature. Through the above structure and working method, the thermostatic valve of the present invention can achieve stable and reliable constant temperature water output under various power supply conditions, significantly improving water comfort and safety.

[0055] The above is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A thermostatic valve control circuit, characterized in that, include: The parameter detection module (100) is used to detect water flow rate and temperature, and convert the detection results into water flow rate parameters and temperature parameters; The motor drive module (200) is used to receive control signals and drive the motor (2) to adjust the position of the valve core (11) of the thermostatic valve; The main control module (300) is electrically connected to the parameter detection module (100) and the motor drive module (200) respectively, and is used to receive the water flow parameters and the temperature parameters, and generate control signals based on the water flow parameters and the temperature parameters and send them to the motor drive module (200). The power supply module (400) is electrically connected to the parameter detection module (100), the main control module (300) and the motor drive module (200), and is used to provide working power to the parameter detection module (100), the main control module (300) and the motor drive module (200) when the external power supply is disconnected.

2. The thermostatic valve control circuit according to claim 1, characterized in that, The power supply module (400) includes a boost unit (410), a buck unit (420), a charging management unit (430), and a charging switch unit (440). The input terminal of the boost unit (410) is connected to a rechargeable battery. The output terminal of the boost unit (410) is connected to the input terminal of the buck unit (420) and the power supply terminal of the motor drive module (200). The output terminal of the buck unit (420) is connected to the input terminal of the charging switch unit (440), the parameter detection module (100), the motor drive module (200), and the main control module (300). The output terminal of the charging switch unit (440) is connected to the charging management unit (430). The boost unit (410) is used to increase the voltage output by the rechargeable battery when the external power supply is disconnected, so as to meet the driving voltage requirements of the motor drive module (200). The step-down unit (420) is used to step down and regulate the voltage output by the boost unit (410) to provide working power to the parameter detection module (100), the main control module (300) and the charging switch unit (440); The charging management unit (430) is used to manage the charging of the rechargeable battery when an external power source is available; The charging switch unit (440) is used to selectively connect or disconnect the electrical connection between the charging management unit (430) and the rechargeable battery under the control of the main control module (300).

3. The thermostatic valve control circuit according to claim 2, characterized in that, The charging switch unit (440) includes resistors R31 and R32 and a switching transistor U1. The switching transistor U1 is a MOS transistor. One end of resistor R31 is connected to the control terminal of the charging management unit (430). The other end of resistor R31 is connected to one end of resistor R32 and the gate of the switching transistor U1. The drain of the switching transistor U1 is connected to the output terminal of the buck unit (420) and the other end of resistor R32. The source of the switching transistor U1 is connected to the feedback terminal of the charging management unit (430).

4. The thermostatic valve control circuit according to claim 3, characterized in that, The boost unit (410) includes an inductor L3, resistors R33, R34, and R35, capacitors C23 and C24, capacitor EC6 and EC7, diodes D1 and D2, and a boost chip U2. One end of resistor R33 is connected to the rechargeable battery, the sixth terminal of the boost chip U2, and one end of capacitor EC6. The other end of capacitor EC6 is grounded. The other end of resistor R33 is connected to the first, seventh, and eighth terminals of the boost chip U2. The fifth terminal of the boost chip U2 is connected to one end of resistor R34. One end of the resistor R34 is grounded, and the other end of the resistor R35 is connected to one end of the inductor L3, one end of the capacitor EC7, one end of the capacitor C24, and the anode of the diode D2. The cathode of the diode D2 is connected to the input terminal of the step-down unit (420). The other end of the capacitor EC7 is grounded, and the other end of the capacitor C24 is grounded. The other end of the inductor L3 is connected to the second terminal of the boost chip U2 and the cathode of the first diode. The anode of the first diode is grounded. The third terminal of the boost chip U2 is connected to the fourth terminal of the boost chip U2 and the ground terminal through the capacitor C23.

5. The thermostatic valve control circuit according to claim 4, characterized in that, The step-down unit (420) includes a step-down chip IC3, capacitors C6, C14, EC3, and EC4. One end of capacitor EC4 is connected to one end of capacitor C6, the output terminal of the boost unit (410), and the input terminal of step-down chip IC3. The other end of capacitor EC4 is connected to the other end of capacitor C6, the ground terminal of step-down chip IC3, the ground terminal, one end of capacitor C14, and one end of capacitor EC3. The other end of capacitor C14 is connected to the other end of capacitor EC3 and the output terminal of step-down chip IC3.

6. The thermostatic valve control circuit according to claim 5, characterized in that, The parameter detection module (100) further includes a water flow detection unit (110) and a temperature detection unit (120). The water flow detection unit (110) is electrically connected to the main control module (300) and is used to detect the water flow information in the thermostatic valve and convert it into the water flow parameter and send it to the main control module (300). The temperature detection unit (120) is electrically connected to the main control module (300) and is used to detect the water temperature information in the thermostatic valve and convert it into the temperature parameter and send it to the main control module (300).

7. The thermostatic valve control circuit according to claim 6, characterized in that, It also includes a display module (500), which is electrically connected to the main control module (300) and is used to receive display data sent by the main control module (300) and display the working status, temperature information and / or abnormal prompt information of the thermostatic valve.

8. The thermostatic valve control circuit according to claim 2, characterized in that, It also includes a serial port module (600), which is electrically connected to the main control module (300) and is used for data communication between the main control module (300) and an external display device, debugging equipment or upper control unit.

9. A thermostatic valve, characterized in that, The device includes a valve body (1), a motor (2), a rechargeable battery, and a circuit board. The valve body (1) includes a rotatable valve core (11), and the circuit board includes a thermostatic valve control circuit as described in any one of claims 1-8. The motor (2) is installed inside the valve body (1) and is connected to the valve core (11) for driving the valve core (11) to adjust the mixing ratio of hot and cold water. The parameter detection module (100) is installed inside the valve body (1) for collecting the water flow and temperature of the thermostatic valve. The valve body (1) includes a valve body hot water outlet (12), a valve body hot water inlet (13), a valve body cold water outlet (14), and a valve body cold water inlet (15) that are interconnected. The temperature detection unit (120) is set at the valve body hot water outlet (12) to collect the outlet temperature of the thermostatic valve. The valve body cold water inlet is used to connect to the tap water network to provide cold water to the thermostatic valve. The valve body cold water outlet (14) is used to connect to the inlet of the water heater (5) to inject cold water into the water heater (5). The valve body hot water inlet (13) is used to connect to the outlet of the water heater (5) to provide hot water to the thermostatic valve. The valve body hot water outlet (12) is used to connect to the water user to output constant temperature mixed water to the water user.

10. A water heater (5), characterized in that, The thermostatic valve as described in claim 9 is provided in the water heater (5), which has an inner tank (51), an electric heating element (52), an inlet pipe (53), and an outlet pipe (54). The cold water inlet of the thermostatic valve body is connected to the tap water network to provide cold water to the thermostatic valve. The cold water outlet (14) of the thermostatic valve body is connected to the inlet pipe (53) of the water heater (5) to inject cold water into the inner tank (51) of the water heater (5). The hot water inlet (13) of the thermostatic valve body is connected to the outlet pipe (54) of the water heater (5) to introduce the hot water heated by the water heater (5) into the thermostatic valve. The hot water outlet (12) of the thermostatic valve body is connected to the water user to output constant temperature mixed water to the water user.

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