Built-in control circuit for electric heating towel rack

Abstract

The utility model discloses a built-in control circuit for an electric heating towel rack, and belongs to the technical field of smart home control. The technical problems that an existing electric heating towel rack control circuit is incomplete in protection function, poor in man-machine interaction and low in temperature control precision are solved. The circuit adopts the main control module as a core, the temperature sensor monitors the temperature in real time and feeds back the temperature to the main control module, and the main control module accurately controls the working state of the heating element; the power supply module supplies power to the system and is connected with the overload protection module in series and the leakage protection module in parallel to realize double safety protection. And the display module and the key module respectively provide state display and operation control functions. According to the electric heating towel rack, high-precision temperature control, multiple safety protection and convenient man-machine interaction are achieved through modular design, the electric heating towel rack has the advantages of being compact in structure, high in response speed, high in safety and reliability and the like, and the use performance and safety of the electric heating towel rack are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of household appliance control technology, specifically a built-in control circuit for an electric towel rack. Background Technology

[0002] Traditional electric towel racks typically use simple temperature control switches to operate the heating elements, resulting in inaccurate temperature control, high energy consumption, and insufficient safety. Existing technology often uses external controllers, which not only affects aesthetics but also increases installation complexity. Furthermore, most existing electric towel rack control circuits lack comprehensive protection functions, such as overload protection and leakage protection, posing safety hazards. There is an urgent market need for a highly integrated, precise, and reliable built-in control circuit that can solve the above problems while maintaining the overall aesthetics and ease of use of the electric towel rack. Summary of the Invention

[0003] The technical problems solved by this implementation plan are the low control precision, insufficient safety, and complex installation of traditional electric towel racks. The technical solution adopted in this implementation plan includes a main control module, a temperature sensor, a heating element, a power supply module, a display module, a button module, an overload protection module, and a leakage protection module. The temperature sensor is connected to the input terminal of the main control module, the heating element is connected to the output terminal of the main control module, the power supply module supplies power to each module, the display module and the button module are respectively connected to the main control module, the overload protection module is connected in series between the power supply module and the main control module, and the leakage protection module is connected in parallel to the output terminal of the power supply module. The beneficial effects of this implementation plan are precise temperature control, multiple safety protections, and an aesthetically pleasing built-in design. The working principle of this implementation plan is that the temperature sensor monitors the temperature in real time, the main control module controls the operation of the heating element according to the set value and the measured value, and the protection module ensures safe use.

[0004] In a preferred implementation, the technical problem addressed is improving control accuracy and response speed. The preferred implementation employs a main control module comprising a microcontroller, a temperature signal processing circuit, and a power drive circuit. The temperature signal processing circuit's input is connected to a temperature sensor, and its output is connected to the microcontroller. The power drive circuit's input is connected to the microcontroller, and its output is connected to the heating element. This preferred implementation achieves high-precision temperature signal acquisition and accurate power control. The working principle involves processing the temperature signal and driving the heating element through dedicated circuitry, thereby improving system performance.

[0005] In a preferred implementation, the technical problem addressed is improving temperature measurement accuracy. The preferred implementation employs a temperature signal processing circuit comprising a signal amplification unit and an analog-to-digital converter (ADC). The input of the signal amplification unit is connected to the temperature sensor, and its output is connected to the input of the ADC. The output of the ADC is then connected to a microcontroller. This preferred implementation results in high-precision temperature signal acquisition and processing. The working principle involves amplifying and digitally processing the temperature signal to improve measurement accuracy.

[0006] In a preferred embodiment, the technical problem solved is achieving precise power control. The preferred embodiment employs a power drive circuit comprising a PWM control unit and a power switching unit; the input of the PWM control unit is connected to a microcontroller, and its output is connected to the control terminal of the power switching unit, which in turn connects to the heating element. The beneficial effect of this preferred embodiment is the realization of stepless adjustment of heating power and improved temperature control accuracy. The working principle employed is the precise control of heating power using PWM technology.

[0007] In a preferred embodiment, the technical problem solved is providing a stable and reliable power supply. In this preferred embodiment, the power module includes an AC-DC conversion unit and a voltage regulator unit; the input of the AC-DC conversion unit is connected to AC mains power, and its output is connected to the input of the voltage regulator unit, whose output supplies power to each module. The beneficial effect of this preferred embodiment is the provision of a stable and reliable power supply. The working principle involves providing a stable DC power supply through AC-DC conversion and voltage regulation.

[0008] In a preferred embodiment, the technical problem solved is to achieve intuitive status display. In this preferred embodiment, the technical solution involves a display module comprising an LED display screen and a display driver circuit; the input of the display driver circuit is connected to the main control module, and the output is connected to the LED display screen. The beneficial effect of this preferred embodiment is the achievement of intuitive temperature and operating status display. The working principle involves controlling the display screen to show relevant information through the driver circuit.

[0009] In a preferred embodiment, the technical problem solved is to achieve convenient parameter setting. In this preferred embodiment, the technical solution involves a key module comprising a matrix keyboard and a key scanning circuit; the input of the key scanning circuit is connected to the matrix keyboard, and the output is connected to the main control module. The beneficial effect of this preferred embodiment is the realization of convenient parameter setting and function selection. The working principle involves detecting key operations through the scanning circuit.

[0010] In a preferred embodiment, the technical problem addressed is preventing overload damage to equipment. In this preferred embodiment, the overload protection module includes a current detection unit and a relay control unit; the current detection unit is connected in series in the power supply circuit, and its output is connected to the control terminal of the relay control unit, whose contacts are connected in series in the power supply circuit. The beneficial effect of this preferred embodiment is effective prevention of overload damage to equipment. The working principle involves detecting the current and cutting off the power supply in case of an overload.

[0011] In a preferred implementation, the technical problem addressed is preventing leakage current hazards. The preferred implementation employs a leakage current protection module comprising a zero-sequence current transformer and a trip unit. The zero-sequence current transformer detects leakage current in the power line, and its output is connected to the control terminal of the trip unit. The contacts of the trip unit are connected in series in the power circuit. The beneficial effect of this preferred implementation is effective prevention of leakage current hazards. The working principle involves detecting leakage current and cutting off the power supply in case of danger.

[0012] In a preferred implementation, the technical problem solved is to achieve remote control functionality. In this preferred implementation, the technical solution also includes a wireless communication module connected to the main control module to enable remote control. The beneficial effect of this preferred implementation is the realization of convenient remote control. The working principle involves using the wireless communication module to achieve remote data transmission and control. Attached Figure Description

[0013] Figure 1 This is a system structure diagram of the built-in control circuit of this utility model;

[0014] Figure 2 Demonstrates the internal structure and connections of the main control module;

[0015] Figure 3 Demonstrates the internal structure of the temperature signal processing circuit;

[0016] Figure 4 The signal flow diagram for the power drive circuit is as follows: Microcontroller → PWM control → Power switch → Heating element;

[0017] Figure 5 The power flow of the power module is as follows: AC mains power → AC-DC conversion → voltage regulator unit → system power supply;

[0018] Figure 6 To display the module system diagram;

[0019] Figure 7 This is a system diagram of the button module;

[0020] Figure 8 This is a system diagram of the overload protection module;

[0021] Figure 9 This is a system diagram of the leakage current protection module;

[0022] Figure 10 This is a system diagram of the wireless communication module.

[0023] 1. Main control module; 2. Temperature sensor; 3. Heating element; 4. Power supply module; 5. Display module; 6. Keypad module; 7. Overload protection module; 8. Leakage protection module; 9. Wireless communication module; 11. Microcontroller; 12. Temperature signal processing circuit; 13. Power drive circuit; 41. AC-DC conversion unit; 42. Voltage regulator unit; 51. LED display screen; 52. Display driver circuit; 61. Matrix keyboard; 62. Keypad scanning circuit; 71. Current detection unit; 72. Relay control unit; 81. Zero-sequence current transformer; 82. Trip unit; 121. Signal amplification unit; 122. Analog-to-digital converter; 131. PWM control unit; 132. Power switch unit. Detailed Implementation

[0024] Combination Figures 1-10 The present invention further describes its specific implementation.

[0025] Example 1

[0026] An integrated control circuit for an electric towel rack includes a main control module 1, a temperature sensor 2, a heating element 3, a power supply module 4, a display module 5, a button module 6, an overload protection module 7, and a leakage protection module 8. The temperature sensor 2 is a DS18B20 digital temperature sensor, mounted on the surface of the towel rack, and connected to the main control module 1 via a single bus. The heating element 3 is a nickel-chromium alloy heating wire with a power of 200W. The AC-DC conversion unit 41 of the power supply module 4 uses an HLK-PM01 module to convert 220V AC to 12V DC, and the voltage regulator unit 42 uses an LM7805 three-terminal regulator. The LED display screen 51 of the display module 5 is a 0.96-inch OLED screen, and the display driver circuit 52 uses an SSD1306 driver chip. The matrix keypad 61 of the button module 6 includes four tactile buttons, and the button scanning circuit 62 uses a 74HC165 shift register. The overload protection module 7 uses an ACS712 current sensor in its current detection unit 71, and an SRD-05VDC-SL-C relay in its relay control unit 72. The leakage current protection module 8 uses a 30mA sensitivity zero-sequence current transformer 81 and an electromagnetic trip unit 82. All modules are mounted on a single PCB board, with overall dimensions of 80mm × 60mm × 20mm, and can be integrated into the end cover of an electric towel rack.

[0027] Example 2

[0028] Based on Embodiment 1, the microcontroller 11 of the main control module 1 uses an STM32F103C8T6, the signal amplification unit 121 of the temperature signal processing circuit 12 uses an OP07 operational amplifier, and the analog-to-digital conversion unit 122 uses an STM32 built-in ADC. The PWM control unit 131 of the power drive circuit 13 uses an STM32 built-in PWM generator with a frequency of 20kHz, and the power switching unit 132 uses an IRF540N MOSFET. The wireless communication module 9 uses an ESP8266 WiFi module, which connects to the main control module 1 via a serial port, enabling remote control and status monitoring via a mobile APP. This embodiment adds remote control functionality, allowing users to set temperature, timed on / off functions, etc., through a mobile APP, improving ease of use.

[0029] Example 3

[0030] Based on Example 2, temperature sensor 2 adopts a PT100 platinum resistance temperature sensor, coupled with a dedicated signal conditioning circuit, achieving a measurement accuracy of ±0.1℃. Power module 4 adds a backup lithium battery and charging management circuit, ensuring the clock and settings are not lost during mains power outages. Display module 5 adds a touchscreen function, allowing direct operation of settings on the screen. Overload protection module 7 adds a temperature detection function, automatically cutting off power when the circuit board temperature exceeds 60℃. Leakage protection module 8 adds a self-test function, automatically checking the protection function every 24 hours. This embodiment further improves the system's accuracy, reliability, and safety, making it suitable for high-end electric towel rack products.

[0031] It should be noted that, in this document, the terms "comprising," "including," and any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A built-in control circuit for an electric towel rack, characterized in that, It includes a main control module (1), a temperature sensor (2), a heating element (3), a power supply module (4), a display module (5), a button module (6), an overload protection module (7), and a leakage protection module (8); the temperature sensor (2) is connected to the input terminal of the main control module (1), the heating element (3) is connected to the output terminal of the main control module (1), the power supply module (4) supplies power to each module, the display module (5) and the button module (6) are respectively connected to the main control module (1), the overload protection module (7) is connected in series between the power supply module (4) and the main control module (1), and the leakage protection module (8) is connected in parallel to the output terminal of the power supply module (4).

2. The built-in control circuit according to claim 1, characterized in that, The main control module (1) includes a microcontroller (11), a temperature signal processing circuit (12), and a power drive circuit (13); the input end of the temperature signal processing circuit (12) is connected to the temperature sensor (2), and the output end is connected to the microcontroller (11); the input end of the power drive circuit (13) is connected to the microcontroller (11), and the output end is connected to the heating element (3).

3. The built-in control circuit according to claim 2, characterized in that, The temperature signal processing circuit (12) includes a signal amplification unit (121) and an analog-to-digital converter (122); the input terminal of the signal amplification unit (121) is connected to the temperature sensor (2), the output terminal is connected to the input terminal of the analog-to-digital converter (122), and the output terminal of the analog-to-digital converter (122) is connected to the microcontroller (11).

4. The built-in control circuit according to claim 2, characterized in that, The power drive circuit (13) includes a PWM control unit (131) and a power switch unit (132); the input terminal of the PWM control unit (131) is connected to the microcontroller (11), and the output terminal is connected to the control terminal of the power switch unit (132); the output terminal of the power switch unit (132) is connected to the heating element (3).

5. The built-in control circuit according to claim 1, characterized in that, The power module (4) includes an AC-DC conversion unit (41) and a voltage regulator unit (42); the input terminal of the AC-DC conversion unit (41) is connected to the mains power, and the output terminal is connected to the input terminal of the voltage regulator unit (42); the output terminal of the voltage regulator unit (42) supplies power to each module.

6. The built-in control circuit according to claim 1, characterized in that, The display module (5) includes an LED display screen (51) and a display driving circuit (52); the input end of the display driving circuit (52) is connected to the main control module (1), and the output end is connected to the LED display screen (51).

7. The built-in control circuit according to claim 1, characterized in that, The key module (6) includes a matrix keyboard (61) and a key scanning circuit (62); the input end of the key scanning circuit (62) is connected to the matrix keyboard (61), and the output end is connected to the main control module (1).

8. The built-in control circuit according to claim 1, characterized in that, The overload protection module (7) includes a current detection unit (71) and a relay control unit (72); the current detection unit (71) is connected in series in the power supply circuit, and its output terminal is connected to the control terminal of the relay control unit (72). The contacts of the relay control unit (72) are connected in series in the power supply circuit.

9. The built-in control circuit according to claim 1, characterized in that, The leakage protection module (8) includes a zero-sequence current transformer (81) and a trip unit (82); the zero-sequence current transformer (81) detects the leakage current of the power line, and its output terminal is connected to the control terminal of the trip unit (82). The contacts of the trip unit (82) are connected in series in the power circuit.

10. The built-in control circuit according to claim 1, characterized in that, It also includes a wireless communication module (9), which is connected to the main control module (1) and is used to realize remote control function.

Images