Temperature display control circuit, circuit board and water outlet device

Abstract

The embodiment of the utility model provides a temperature display control circuit, a circuit board and a water outlet device, the circuit is applied to the water outlet device, and the circuit comprises a proximity detection module used for generating a proximity signal; the temperature detection circuit is used for outputting a temperature detection signal; the digital display circuit is used for displaying the water outlet temperature according to the display signal; the main control circuit is respectively connected with the temperature detection circuit, the digital display circuit and the proximity detection module, and the main control circuit is used for outputting a display signal according to the temperature detection signal; and the battery power supply circuit is respectively connected with the main control circuit and the proximity detection module, and the battery power supply circuit is used for supplying power to the proximity detection module and supplying power to the main control circuit under the condition that the proximity detection module generates the proximity signal. According to the embodiment, the reliability of temperature display of the water outlet device can be improved.

Description

Technical Field

[0001] This application relates to the field of bathroom technology, specifically to a temperature display and control circuit, a circuit board, and a water outlet device. Background Technology

[0002] In related technologies, water outlet devices can be equipped with an internal hydroelectric generator, temperature detection device, and display device. When water is discharged through internal pipes, the hydroelectric generator generates electricity to power the temperature detection and display devices. However, hydroelectric generators are unreliable and prone to damage, which can cause these water outlet devices to malfunction and fail to display the temperature correctly. Utility Model Content

[0003] To address the shortcomings of existing technologies, this application proposes a temperature display control circuit, a circuit board, and a water outlet device, aiming to improve the reliability of the temperature display in the water outlet device.

[0004] To achieve the above objectives, the first aspect of this application provides a temperature display and control circuit for use in a water outlet device, the temperature display and control circuit comprising:

[0005] The proximity detection module is used to generate proximity signals;

[0006] Temperature detection circuit, used to output temperature detection signal;

[0007] Digital display circuit, used to display water temperature based on display signals;

[0008] The main control circuit is connected to the temperature detection circuit, the digital display circuit, and the proximity detection module, respectively. The main control circuit is used to output the display signal according to the temperature detection signal.

[0009] A battery power supply circuit is connected to both the main control circuit and the proximity detection module. The battery power supply circuit is used to power the proximity detection module and, when the proximity detection module generates the proximity signal, to power the main control circuit through the proximity detection module.

[0010] In one embodiment, the proximity detection module includes:

[0011] A proximity detection device is connected to the battery-powered circuit, and the proximity detection device is used to output the proximity signal;

[0012] A first switching unit, the positive terminal of which is connected to the battery power supply circuit, and the negative terminal of which is connected to the main control circuit, wherein the first switching unit is used to connect the main control circuit and the battery power supply circuit when the circuit is on.

[0013] The second switching unit has its control electrode connected to the proximity detection device, and its positive electrode connected to both the battery power supply circuit and the control electrode of the first switching unit. The second switching unit is used to turn on when the proximity detection device outputs the proximity signal, thereby turning on the first switching unit.

[0014] In one embodiment, the battery-powered circuit includes:

[0015] Power supply battery;

[0016] The charging and discharging circuit is connected to the power supply battery, the positive terminal of the first switching unit, and the proximity detection module, respectively. The charging and discharging circuit is used to charge the power supply battery and to supply power to the proximity detection device and the main control circuit through the power supply battery.

[0017] In one embodiment, the charging and discharging circuit includes:

[0018] Charging port;

[0019] The charging and discharging unit is connected to the charging interface and the positive terminal of the first switching unit, respectively.

[0020] A battery protection unit is connected to both the power supply battery and the charging / discharging unit. The battery protection unit is used to disconnect the connection between the power supply battery and the charging / discharging unit when one of the charging current and discharging current of the power supply battery is not less than a preset safety threshold.

[0021] In one embodiment, the charging and discharging unit includes:

[0022] The charging and discharging module is connected to the charging interface, the positive terminal of the first switching unit, and the battery protection unit, respectively.

[0023] A power display module is connected to the charging and discharging module, and the power display module is used to display the current power level of the power supply battery.

[0024] In one embodiment, the battery protection unit includes:

[0025] A charge / discharge control module is connected to the power supply battery. The charge / discharge control module is used to detect one of the charging current and the discharging current, and outputs a connection control signal when the detected current is not less than the preset safety threshold.

[0026] A connection control module is connected to both the power supply battery and the charging / discharging module. The connection control module is used to connect the power supply battery and the charging / discharging module when it receives the connection control signal.

[0027] In one embodiment, the main control circuit is further configured to output a light control signal when the proximity detection device outputs the proximity signal;

[0028] The temperature display and control circuit also includes:

[0029] The lighting module is connected to the main control circuit and is used to emit light according to the lighting control signal.

[0030] In one embodiment, the lighting module includes:

[0031] Lighting components;

[0032] The third switching unit has its positive terminal connected to the negative terminal of the first switching unit, its negative terminal connected to the lighting device, and its control terminal connected to the main control circuit. The third switching unit is used to turn on when the main control circuit outputs the lighting control signal, so as to make the lighting device emit light.

[0033] To achieve the above objectives, a second aspect of this application also provides a circuit board for use in a water outlet device, the circuit board including the temperature display and control circuit as described in the first aspect.

[0034] To achieve the above objectives, a third aspect of this application also provides a water outlet device, which includes a circuit board as described in the second aspect.

[0035] This application provides a temperature display control circuit, a circuit board, and a water dispensing device. The circuit, applied to the water dispensing device, includes a proximity detection module for generating a proximity signal; a temperature detection circuit for outputting a temperature detection signal; a digital display circuit for displaying the water temperature based on the display signal; a main control circuit connected to the temperature detection circuit, the digital display circuit, and the proximity detection module, respectively, and outputting the display signal based on the temperature detection signal; and a battery power supply circuit connected to the main control circuit and the proximity detection module, respectively, for powering the proximity detection module and, when the proximity detection module generates the proximity signal, powering the main control circuit through the proximity detection module. By using the battery power supply circuit and the proximity detection module, the temperature display control circuit can power the main control circuit based on the proximity signal detected by the proximity detection module during user use. This allows the water dispensing device to perform its original functions while eliminating the influence of the hydroelectric generator on the water dispensing device, thus avoiding the situation where the temperature display malfunctions due to damage to the hydroelectric generator, and helping to improve the reliability of the water dispensing device's temperature display. Attached Figure Description

[0036] Figure 1 This is a circuit architecture diagram of a temperature display control circuit provided in an embodiment of this application;

[0037] Figure 2 yes Figure 1 The detailed circuit structure diagram of multiple circuits in the middle;

[0038] Figure 3 yes Figure 1 Circuit diagram of one embodiment of the proximity detection module;

[0039] Figure 4 yes Figure 1 A circuit diagram of one embodiment of a battery-powered circuit;

[0040] Figure 5 yes Figure 1 A circuit diagram of one embodiment of the lighting module.

[0041] Figure label:

[0042] The system includes a proximity detection module 100, a proximity detection device 110, a first switch unit 120, a second switch unit 130, a temperature detection circuit 200, a digital display circuit 300, a main control circuit 400, a clock module 410, a battery power supply circuit 500, a power supply battery 510, a charging and discharging circuit 520, a charging interface 521, a charging and discharging unit 522, a battery protection unit 523, a charging and discharging module 524, a power display module 525, a charging and discharging control module 526, a connection control module 527, a lighting module 600, a lighting device 610, and a third switch unit 620. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0044] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0045] In related technologies, water outlet devices can be equipped with an internal hydroelectric generator, temperature detection device, and display device. When water is discharged through internal pipes, the hydroelectric generator generates electricity to power the temperature detection and display devices. However, hydroelectric generators are unreliable and prone to damage, which can cause these water outlet devices to malfunction and fail to display the temperature correctly.

[0046] To improve the reliability of temperature display in a water dispensing device, this application provides a temperature display control circuit, a circuit board, and a water dispensing device. The circuit, applied to the water dispensing device, includes a proximity detection module for generating a proximity signal; a temperature detection circuit for outputting a temperature detection signal; a digital display circuit for displaying the water temperature based on the display signal; a main control circuit connected to the temperature detection circuit, digital display circuit, and proximity detection module, and outputting a display signal based on the temperature detection signal; and a battery power supply circuit connected to the main control circuit and proximity detection module, supplying power to the proximity detection module and, when the proximity detection module generates a proximity signal, supplying power to the main control circuit. By using the battery power supply circuit and proximity detection module, the temperature display control circuit can power the main control circuit based on the proximity signal detected by the proximity detection module during user use. This eliminates the influence of the hydroelectric generator on the water dispensing device while maintaining its original functions, thus preventing damage to the hydroelectric generator that could cause the temperature display to malfunction, thereby improving the reliability of the water dispensing device's temperature display.

[0047] See Figure 1 , Figure 1 The circuit architecture of a temperature display and control circuit provided in an embodiment of this application is shown. Figure 1 In the illustrated embodiment, the temperature display and control circuit applied to the water outlet device includes a proximity detection module 100, a temperature detection circuit 200, a digital display circuit 300, a main control circuit 400, and a battery power supply circuit 500.

[0048] The proximity detection module 100 can be used to generate a proximity signal. This proximity signal refers to the signal generated by the proximity detection module when it detects that the distance between the user and the water outlet device is less than or equal to a preset distance. Specifically, it can be a current signal or a voltage signal, without limitation here. Furthermore, the proximity detection module 100 can be a standalone proximity detection device (such as a radar device, infrared sensor, etc.), or it can be an integrated module formed by a proximity detection device and peripheral circuitry, etc., without limitation here.

[0049] The temperature detection circuit 200 can be used to output a temperature detection signal. The temperature detection circuit 200 can be an integrated circuit consisting of a temperature detection integrated module and its peripheral circuits, or a circuit consisting of a temperature detection sensor (such as a thermocouple, a temperature-sensitive resistor, an infrared sensor, etc.) and its peripheral circuits, etc., etc., and is not specifically limited here.

[0050] The digital display circuit 300 can be used to display the water temperature based on a display signal. The digital display circuit 300 can be a standalone digital tube, or a digital display module consisting of a digital tube and a decoder, etc., and is not specifically limited here.

[0051] The main control circuit 400 is connected to the temperature detection circuit 200, the digital display circuit 300, and the proximity detection module 100, respectively. The main control circuit 400 can output a display signal based on the temperature detection signal. The main control circuit 400 can be a standalone microcontroller (MCU) and its peripheral circuits (such as…) Figure 2 The integrated circuit consists of a clock module 410, in which the MCU can be PY32, MM32F031K6T6, etc., and no specific limitation is made here.

[0052] The battery power supply circuit 500 is connected to both the main control circuit 400 and the proximity detection module 100. The battery power supply circuit 500 can supply power to the proximity detection module 100, and also supply power to the main control circuit 400 through the proximity detection module 100 when it generates a proximity signal. The battery power supply circuit 500 can consist of a power supply battery and its discharge circuit, or it can consist of a power supply battery and its charging and discharging circuits, etc., etc., and is not specifically limited here.

[0053] In one embodiment, the battery power supply circuit 500 can also be used to stop supplying power to the main control circuit 400 and only supply power to the proximity detection module 100 when the proximity detection module 100 does not generate a proximity signal.

[0054] Specifically, since the battery power supply circuit 500 only supplies power to the proximity detection module 100 when the proximity detection module 100 does not generate a proximity signal, the proximity detection module 100 can continuously detect whether a user is approaching the water outlet device. At this time, the main control circuit 400 is not powered on, so the digital display circuit 300 and the temperature detection circuit 200 do not work. When a user uses the water dispensing device, the proximity detection module 100 generates a proximity signal when the user approaches the device. Therefore, when the proximity detection module 100 generates a proximity signal, the battery power supply circuit 500 can connect the battery power supply circuit 550 and the main control circuit 400 through the proximity detection module 100, so as to simultaneously supply power to the proximity detection module 100 and the main control circuit 400. When the main control circuit 400 is powered on, the temperature detection circuit 200 and the digital display circuit 300 can start working. In this way, the temperature detection circuit 200 can detect the water temperature inside the water dispensing device and output a temperature detection signal to the main control circuit 400. Then, the main control circuit 400 can output a display signal based on the temperature detection signal and output it to the digital display circuit 300. The digital display circuit 300 displays the specific water temperature based on the output display signal.

[0055] See Figure 3 , Figure 3 It shows Figure 1The circuit structure of one embodiment of a proximity detection module is shown. In one embodiment, the proximity detection module 100 includes a proximity detection device 110, a first switching unit 120, and a second switching unit 130.

[0056] The proximity detection device 110 is connected to the battery-powered circuit 500 and can be used to output a proximity signal. The proximity detection device 110 can be a temperature-sensitive resistor, an infrared sensor, etc., and is not specifically limited here.

[0057] The positive terminal of the first switching unit 120 is connected to the battery power supply circuit 500, and the negative terminal of the first switching unit 120 is connected to the main control circuit 400. The first switching unit 120 can be used to connect the main control circuit 400 and the battery power supply circuit 500 when the circuit is on.

[0058] The control electrode of the second switching unit 130 is connected to the proximity detection device 110. The positive electrode of the second switching unit 130 is connected to the battery power supply circuit 500 and the control electrode of the first switching unit 120 respectively. The second switching unit 130 can be turned on when the proximity detection device 110 outputs a proximity signal, so as to turn on the first switching unit 120.

[0059] In one embodiment, the first switching unit 120 and the second switching unit 130 can each be a separate switching device or an integrated unit composed of a switching device and its peripheral circuitry; no specific limitation is made here. Furthermore, the switching devices in the first switching unit 120 and the second switching unit 130 can each be specific switching devices such as transistors or field-effect transistors; no specific limitation is made here. Additionally, the positive terminal of each switching unit is the terminal from which current flows into the switching unit (e.g., the collector of an N-type transistor, the drain of an N-type MOSFET), and the negative terminal is the terminal from which current flows out of the switching unit (e.g., the emitter of an N-type transistor, the source of an N-type MOSFET).

[0060] Specifically, when the proximity detection device 110 detects a user approaching the water outlet, it outputs a proximity signal. Since the positive terminal of the second switching unit 130 is connected to the battery power supply circuit 500, and the battery power supply circuit 500 continuously supplies power to the proximity detection module 100, the second switching unit 130 can be turned on when the proximity signal acts on the control terminal of the second switching unit 130. Since the positive terminal of the second switching unit 130 is connected to the control terminal of the first switching unit 120, the first switching unit 120 can be turned on, thereby connecting the main control circuit 400 and the battery power supply circuit 500, allowing the main control circuit 400 to power on. Conversely, when the proximity detection device 110 does not detect a user approaching the water outlet, it cannot output a proximity signal, causing the second switching unit 130 to turn off, which in turn causes the first switching unit 120 to turn off, thus cutting off the connection between the main control circuit 400 and the battery power supply circuit 500, causing the main control circuit 400 to power off. This enables automated power-on and power-off of the temperature display control circuit.

[0061] See Figure 4 , Figure 4 It shows Figure 1 A circuit structure of one embodiment of a battery-powered circuit. In one embodiment, the battery-powered circuit 500 includes a power supply battery 510 and a charging / discharging circuit 520.

[0062] The charging and discharging circuit 520 is connected to the power supply battery 510, the positive terminal of the first switching unit 120, and the proximity detection module 110, respectively. The charging and discharging circuit 520 is used to charge the power supply battery 510 and to supply power to the proximity detection device 110 and the main control circuit 400 through the power supply battery 510. The charging and discharging circuit 520 can be a charging and discharging control chip and its peripheral circuits. For example, the charging and discharging circuit 520 can include a charging and discharging control chip and a transformer module (such as a Buck converter or a Boost converter). During charging, the charging and discharging control chip can control the charging process of the power supply battery 510. During discharging, the charging and discharging control chip can control the discharging of the power supply battery 510 and convert the output voltage into a voltage suitable for the main control circuit 400 through the transformer module.

[0063] In one embodiment, the charging / discharging circuit 520 may include a charging interface 521, a charging / discharging unit 522, and a battery protection unit 523. The charging / discharging unit 520 is connected to both the charging interface 510 and the positive terminal of the first switching unit 120. The battery protection unit 523 is connected to both the power supply battery 510 and the charging / discharging unit 522. The battery protection unit 523 can disconnect the connection between the power supply battery 521 and the charging / discharging unit 522 when either the charging current or the discharging current of the power supply battery 521 is not less than a preset safety threshold. The charging interface 521 may be a Type-C interface, a Micro-B interface, etc., and is not specifically limited here. Furthermore, the battery protection unit 523 may be a charging / discharging protection chip (such as HTL6053, ZCC5600, etc.) and its peripheral circuitry, and is not specifically limited here.

[0064] In one embodiment, the charging / discharging unit 522 includes a charging / discharging module 524 and a power display module 525. The charging / discharging module 524 is connected to the charging interface, the positive terminal of the first switching unit 120, and the battery protection unit 523, respectively. The power display module 525 is connected to the charging / discharging module 524 and can be used to display the current power level of the power supply battery 510. The charging / discharging module 524 can be a charging / discharging chip (such as IP5528, etc.). Figure 3 The module consists of an ETA9740 (as shown in the image) and its peripheral circuitry. Additionally, the power display module 525 can be an integrated module composed of multiple LEDs, a digital tube, etc., without specific limitations here. Furthermore, the specific form of power display depends on the specific form of the power display module 525, such as a percentage display using multiple LEDs, or a specific power display method using a digital tube, etc.

[0065] In one embodiment, the battery protection unit 523 includes a charge / discharge control module 526 and a connection control module 527. The charge / discharge control module 526 is connected to the power supply battery 510. The charge / discharge control module 526 can detect either the charging current or the discharging current, and output a connection control signal if the detected current is not less than a preset safety threshold. The connection control module 527 is connected to both the power supply battery 510 and the charge / discharge module 524. The connection control module 527 can connect the power supply battery and the charge / discharge module when it receives the connection control signal. Specifically, when charging the power supply battery 510, the charge / discharge control module 526 can detect the charging current. If the charging current is less than the preset safety threshold, it does not output a connection control signal, allowing the connection control module 527 to maintain the connection between the power supply battery 510 and the charge / discharge module 524, thus continuing the charging process. If the charging current is not less than the preset safety threshold, it outputs a connection control signal, causing the connection control module 527 to disconnect the connection between the power supply battery 510 and the charge / discharge module 524, thus stopping the charging process. When power is supplied by the battery 510 (i.e., during the discharge process), the charge / discharge control module 526 can detect the discharge current. When the discharge current is less than a preset safety threshold, it does not output a connection control signal, allowing the connection control module 527 to maintain the connection between the battery 510 and the charge / discharge module 524, thus ensuring the power supply process continues. When the discharge current is not less than the preset safety threshold, it outputs a connection control signal, causing the connection control module 527 to disconnect the battery 510 and the charge / discharge module 524, thus stopping the power supply process. Through this circuit structure, the battery protection unit 523 can effectively improve the safety of the battery 510 during the charge / discharge process, thereby improving the safety of the temperature display control circuit.

[0066] In one embodiment, the battery protection unit 523 may be a control chip with current detection function (such as DW01, DV6011, etc.), or it may be a unit composed of the battery protection unit 523 and its peripheral circuits. The specific details are not limited here.

[0067] In one embodiment, the connection control module 527 may be a chip with switching function (such as 8205, EG5620, etc.), or a module formed by combining multiple switching devices, etc., and the specific details are not limited here.

[0068] See Figure 5 , Figure 5 It shows Figure 1The circuit structure of one embodiment of the lighting module is shown. In one embodiment, the main control circuit 400 can also output a lighting control signal when the proximity detection device 110 outputs a proximity signal. The temperature display control circuit may further include a lighting module 600, which is connected to the main control circuit 400 and can emit light according to the lighting control signal. The lighting module 600 can be a standalone lighting device, or a module consisting of a lighting device and a brightness control device, etc., etc., and is not specifically limited here.

[0069] In one embodiment, the lighting module 600 may include a lighting device 610 and a third switching unit 620. The positive terminal of the third switching unit 620 is connected to the negative terminal of the first switching unit 120, the negative terminal of the third switching unit 620 is connected to the lighting device 610, and the control terminal of the third switching unit 620 is connected to the main control circuit 400. The third switching unit 6230 can be turned on when the main control circuit 400 outputs a lighting control signal, so as to make the lighting device emit light. The lighting device 610 may be an LED, a light strip, an ambient light, etc., and is not specifically limited here.

[0070] In one embodiment, the third switching unit 620 can be a single switching device or an integrated unit consisting of a switching device and its peripheral circuitry; no specific limitation is made here. Furthermore, the switching device in the third switching unit 620 can be a transistor, a field-effect transistor, or other specific switching device; no specific limitation is made here. Additionally, the positive terminal of the third switching unit 620 is the terminal from which current flows into the switching unit (e.g., the collector of an N-type transistor, the drain of an N-type MOSFET), excluding the control terminal; and the negative terminal is the terminal from which current flows out of the switching unit (e.g., the emitter of an N-type transistor, the source of an N-type MOSFET), excluding the control terminal.

[0071] To achieve the above objectives, a second aspect of this application also provides a circuit board for use in a water outlet device, the circuit board including a temperature display and control circuit as provided in any of the above embodiments.

[0072] To achieve the above objectives, a third aspect of this application also provides a water outlet device, which includes a circuit board as provided in the second aspect.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: the existence of a alone, the existence of b alone, the existence of c alone, the simultaneous existence of a and b, the simultaneous existence of a and c, the simultaneous existence of b and c, or the simultaneous existence of a, b, and c, where a, b, and c can be single or multiple.

[0075] In the embodiments of this application, "instruction" can include direct and indirect instructions, as well as explicit and implicit instructions. The information indicated by a certain piece of information is called the information to be instructed. In the specific implementation process, there can be many ways to instruct the information to be instructed, such as, but not limited to, directly instructing the information to be instructed, such as instructing the information to be instructed itself or its index. It can also indirectly instruct the information to be instructed by instructing other information, where there is a relationship between the other information and the information to be instructed. It can also instruct only a part of the information to be instructed, while the other parts are known or pre-agreed upon. For example, the instruction of specific information can be achieved by using a pre-agreed (e.g., protocol-defined) arrangement of various pieces of information, thereby reducing the instruction overhead to some extent.

[0076] In the embodiments of this application, the terms and English abbreviations are exemplary examples given for ease of description and should not be construed as limiting the application in any way. This application does not preclude the possibility of defining other terms that can achieve the same or similar functions in existing or future agreements.

[0077] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0078] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A temperature display control circuit, characterized by comprising: The temperature display control circuit is applied to a water outlet device and comprises: a proximity detection module for generating a proximity signal; a temperature detection circuit for outputting a temperature detection signal; a digital display circuit for displaying the water outlet temperature according to the display signal; a main control circuit connected with the temperature detection circuit, the digital display circuit and the proximity detection module, respectively, for outputting the display signal according to the temperature detection signal; a battery power supply circuit connected with the proximity detection module, for supplying power to the proximity detection module and supplying power to the main control circuit through the proximity detection module when the proximity detection module generates the proximity signal.

2. The circuit of claim 1, wherein, The proximity detection module comprises: a proximity detection device connected with the battery power supply circuit, for outputting the proximity signal; a first switch unit, whose anode is connected with the battery power supply circuit and whose cathode is connected with the main control circuit, for making the main control circuit and the battery power supply circuit conductive when the first switch unit is turned on; a second switch unit, whose control electrode is connected with the proximity detection device, whose anode is connected with the battery power supply circuit and the control electrode of the first switch unit, respectively, and for being turned on to make the first switch unit conductive when the proximity detection device outputs the proximity signal.

3. The circuit of claim 2, wherein, The battery power supply circuit comprises: a power supply battery; a charge and discharge circuit connected with the power supply battery, the anode of the first switch unit and the proximity detection device, respectively, for charging the power supply battery and supplying power to the proximity detection device and the main control circuit through the power supply battery.

4. The circuit of claim 3, wherein, The charge and discharge circuit comprises: a charging interface; a charge and discharge unit connected with the charging interface and the anode of the first switch unit, respectively; a battery protection unit connected with the power supply battery and the charge and discharge unit, respectively, for disconnecting the connection between the power supply battery and the charge and discharge unit when one of the charging current and the discharging current of the power supply battery is not less than a preset safety threshold.

5. The circuit of claim 4, wherein, The charge and discharge unit comprises: a charge and discharge module connected with the charging interface, the anode of the first switch unit and the battery protection unit, respectively; a power display module connected with the charge and discharge module, for displaying the current power of the power supply battery.

6. The circuit of claim 5, wherein, The battery protection unit comprises: a charge and discharge control module connected with the power supply battery, for detecting one of the charging current and the discharging current and outputting a connection control signal when the detected current is not less than the preset safety threshold; a connection control module connected with the power supply battery and the charge and discharge module, respectively, for making the power supply battery and the charge and discharge module conductive when the connection control signal is received.

7. The circuit of any one of claims 5 or 6, wherein, The master control circuit is further configured to output a light control signal when the proximity detection device outputs the proximity signal. The temperature display control circuit further comprises: A light module connected with the master control circuit, the light module being configured to emit light according to the light control signal.

8. The circuit of claim 7, wherein, The light module comprises: A light device; A third switch unit, a positive electrode of the third switch unit being connected with a negative electrode of the first switch unit, a negative electrode of the third switch unit being connected with the light device, and a control electrode of the third switch unit being connected with the master control circuit, the third switch unit being configured to be turned on when the master control circuit outputs the light control signal, so as to make the light device emit light.

9. A circuit board, characterized by The circuit board is applied to a water outlet device, and the temperature display control circuit according to any one of claims 1 to 8 is included in the circuit board.

10. A water outlet device characterized by comprising: The water outlet device includes the circuit board according to claim 9.

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