Safe-voltage high-power drinking water heating method and device

Abstract

The invention relates to a safe-voltage high-power drinking water heating method and device. The safe-voltage high-power drinking water heating method comprises the following steps that S1, alternating-current mains supply is connected; s2, the filtered alternating current is converted into direct current safety voltage, and S3, in the power-on process, impact current is restrained through a slow start circuit, and a normal working state is started after system initialization is completed; s4, the water temperature in the water trough is monitored in real time through a temperature sensor, and a temperature signal is fed back to the main control unit; s5, the main control unit achieves closed-loop control over the water temperature according to the difference value between the set temperature and the real-time temperature; s6, the heating disc works under the direct-current safety voltage, and the heating surface of the heating disc is in direct contact with water in the water trough for heating; and S7, in the heating process, the water temperature, the set temperature and the working state are displayed in real time. The invention has the advantages that the electric shock risk is avoided; the leakage protection switch and the electromagnetic interference filter circuit are combined to form a multi-protection system from personal safety to equipment stability, and the device is especially suitable for humid electricity utilization environments such as pastures and farms.

Description

Technical Field

[0001] This invention relates to a safe voltage high-power drinking water heating method and apparatus, belonging to the field of drinking water equipment heating. Background Technology

[0002] Currently, devices used in the market to provide heating sources for drinking water equipment generally employ two heating methods: heating element heating and heating plate heat conduction. Heating element heating, because the heating element is in direct contact with the water, poses a risk of electric leakage over time, potentially endangering people and animals. Furthermore, since most water used is groundwater, which is hard and prone to scaling, scale buildup pollutes the water, breeds bacteria, and, most importantly, prevents heat dissipation from the pipes, leading to damage to the heating element.

[0003] While heating elements solve the problem of water and electricity isolation, their different heat conduction methods result in low efficiency. Poor contact can easily damage the heating elements, making replacement difficult and after-sales service challenging. Furthermore, most existing heating devices on the market operate on 220V, posing significant safety risks in humid environments. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a safe, high-power drinking water heating method with a specific voltage. The technical solution of this invention is as follows: A safe voltage high-power drinking water heating method includes the following steps: S1. Connect to AC mains power and perform electromagnetic interference filtering and leakage protection. S2. Convert the filtered AC power into a safe DC voltage and maintain a stable output voltage through a constant voltage control circuit; S3. Upon power-up, the inrush current is suppressed by the soft-start circuit, and the system enters normal working state after initialization is completed; S4. Monitor the water temperature in the drinking tank in real time using a temperature sensor and feed the temperature signal back to the main control unit; S5. The main control unit adjusts the DC power output to the heating plate based on the difference between the set temperature and the real-time temperature to achieve closed-loop control of the water temperature; S6. The heating plate operates under a safe DC voltage, and its heating surface is in direct contact with the water in the water tank for heating. S7. During the heating process, the water temperature, set temperature and working status are displayed in real time, and a fault alarm signal is output when a functional abnormality is detected.

[0005] The DC safety voltage is DC 24V.

[0006] The constant voltage control circuit samples the output voltage and feeds it back to the front-end control chip to adjust the conduction pulse width, so that the load power of the heating plate remains constant within the range of input voltage from 180V to 260V.

[0007] The soft-start circuit is implemented by connecting a relay and a resistor in series. When powered on, the electrolytic capacitor is charged through the resistor. After a delay, the relay is energized to short-circuit the resistor, thus completing the startup process.

[0008] The heating plate is made of 304 stainless steel and is connected to the output power cord via an aviation quick-connect plug.

[0009] An apparatus for implementing the safe voltage high-power drinking water heating method includes an equipment control box (1), an input power line (2), a temperature sensor (3), a heating plate (4), a waterproof sealing gasket (5), and a fixed flange (7). The input power line (2) is used to introduce AC mains power and connect to the equipment control box (1). The heating plate (4) is connected to the DC safe voltage output terminal of the equipment control box (1) through an output power line (8). The heating plate (4) is fixedly installed at the heating interface of the drinking water tank (6) through the fixed flange (7), and the waterproof sealing gasket (5) is installed between the heating plate (4) and the drinking water tank (6). The heating surface of the heating plate (4) is in direct contact with the water in the drinking water tank (6). The temperature sensor (3) is installed at the bottom of the inner wall of the drinking water tank (6), and the signal output terminal of the temperature sensor (3) is connected to the equipment control box (1).

[0010] The equipment control box (1) includes a control box body (C) and a leakage current protection switch (A), a cable connector (D), a status indicator (E), and a digital display circuit board (F) installed on the control box body (C). The input end of the leakage current protection switch (A) is connected to the input power line (2), and the output end is connected to the power input end of the main circuit board (B). The controlled power output end and the signal acquisition end of the main circuit board (B) are respectively connected to the output power line (8) and the temperature sensor (3) through the cable connector (D). The digital display circuit board (F) and the status indicator (E) are both communicatively connected to the main circuit board (B) for parameter display, command input, and working status indication.

[0011] The heating plate (4) is connected to the output power line (8) via an aviation quick connector.

[0012] A constant voltage control circuit is integrated in the equipment control box (1). The constant voltage control circuit samples the output voltage and feeds it back to the front-end control chip to adjust the conduction pulse width so that the load power of the heating plate (4) remains constant within a wide input voltage range of 180V to 260V. A power-on soft start circuit is integrated in the equipment control box (1). The power-on soft start circuit consists of a relay and a resistor connected in series. The electrolytic capacitor is charged through the resistor. After a delay, the relay is energized to short-circuit the resistor.

[0013] The input section of the device control box (1) is also provided with an electromagnetic interference filtering circuit, which includes a common mode inductor, a varistor, an X capacitor and a Y capacitor. The live wire L and the neutral wire N of the input power line (2) are connected in series with the common mode inductor. On the output side of the common mode inductor, the varistor and the X capacitor are connected in parallel between the live wire L and the neutral wire N. One end of the two Y capacitors is connected to the live wire L and the neutral wire N respectively, and the other end is connected to the ground wire GND.

[0014] The advantages of this invention are: 1. The heating plate is powered by a safe DC 24V voltage, which fundamentally eliminates the risk of electric shock. Combined with a leakage protection switch and an electromagnetic interference filtering circuit, it forms a multi-layer protection system from personal safety to equipment stability, which is especially suitable for humid and complex electrical environments such as ranches and farms.

[0015] 2. The heating plate is made of 304 stainless steel and comes into direct contact with water, resulting in high heat transfer efficiency and minimal heat loss. Its large heating area design effectively reduces the heat load per unit area, significantly reducing scale formation and adhesion. This solves the problem of overheating damage caused by scale buildup in traditional heating tubes, extending the equipment's service life.

[0016] 3. Precise water temperature regulation is achieved through real-time feedback from a temperature sensor and closed-loop control of the main control unit. An integrated constant voltage control circuit ensures constant output power within a wide voltage range of 180V-260V, guaranteeing stable heating performance and avoiding power fluctuations and energy waste caused by voltage volatility, thus improving energy efficiency.

[0017] 4. The device integrates a power-on soft-start circuit, effectively suppressing inrush current and protecting internal components. The heating plate and power cord are connected via an aviation-grade quick-connect plug, supporting rapid plugging and unplugging for easy replacement. This modular design greatly simplifies daily maintenance and after-sales service processes, reducing maintenance costs and time.

[0018] 5. The equipment control box is equipped with a digital display circuit board and status indicator lights, which can display the water temperature, set temperature, and operating status in real time, providing an intuitive and user-friendly human-machine interface. Simultaneously, the system has fault detection and alarm functions, which can promptly output fault signals, facilitating users to quickly identify and locate problems, thus improving the manageability and safety of the equipment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of the device of the present invention.

[0020] Figure 2 yes Figure 1 Exploded view.

[0021] Figure 3 yes Figure 1 A schematic diagram of the structure of the equipment control box.

[0022] Figure 4 yes Figure 3 Exploded view.

[0023] Figure 5 yes Figure 3 A schematic diagram of the digital display circuit board structure. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solutions of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0025] See Figures 1 to 5 This invention relates to a safe voltage high-power drinking water heating method. Includes the following steps: S1. Connect to AC mains power and perform electromagnetic interference filtering and leakage protection. S2. Convert the filtered AC power into a safe DC voltage and maintain a stable output voltage through a constant voltage control circuit; S3. Upon power-up, the inrush current is suppressed by the soft-start circuit, and the system enters normal working state after initialization is completed; S4. Monitor the water temperature in the drinking tank in real time using a temperature sensor and feed the temperature signal back to the main control unit; S5. The main control unit adjusts the DC power output to the heating plate based on the difference between the set temperature and the real-time temperature to achieve closed-loop control of the water temperature; S6. The heating plate operates under a safe DC voltage, and its heating surface is in direct contact with the water in the water tank for heating. S7. During the heating process, the water temperature, set temperature and working status are displayed in real time, and a fault alarm signal is output when a functional abnormality is detected.

[0026] The above method begins with the connection of AC mains power, but through multiple measures such as electromagnetic filtering, leakage protection, soft start and safe voltage conversion (such as DC 24V), it ultimately applies only DC low-voltage power that is absolutely safe for humans and animals to the heating plate, fundamentally eliminating the risk of electric shock when used in humid or other harsh environments, and achieving true electrical safety.

[0027] A closed-loop control logic of "monitoring-feedback-control-execution" (such as steps S4 and S5) is formed, which precisely controls the temperature by adjusting the power in real time, avoiding excessive temperature fluctuations. At the same time, constant voltage control ensures that the heating power remains constant within a wide voltage input range. Combined with the efficient heat conduction method of direct contact between the heating surface and water, this together ensures the stability of heating efficiency and the long-term reliability of the equipment.

[0028] The entire heating process is not a "black box" operation, but rather a transparent monitoring system operation status achieved through real-time display of water temperature, set status, and other information (S7). Simultaneously, the output of fault alarm signals provides clear guidance for rapid diagnosis and maintenance, greatly improving the equipment's ease of use and maintainability.

[0029] The DC safety voltage is DC 24V.

[0030] The constant voltage control circuit samples the output voltage and feeds it back to the front-end control chip to adjust the conduction pulse width, so that the load power of the heating plate remains constant within the range of input voltage from 180V to 260V.

[0031] The soft-start circuit is implemented by connecting a relay and a resistor in series. Upon power-up, the electrolytic capacitor is charged through the resistor. After a delay, the relay engages to short-circuit the resistor, completing the startup process. This effectively suppresses the huge inrush current generated at the moment of power-up, avoiding damage to the power grid and internal electronic components, and improving the overall reliability and service life of the device.

[0032] The heating plate is made of 304 stainless steel and is connected to the output power cord via an aviation quick-connect plug. This allows for quick plugging and unplugging and replacement of the heating plate, greatly improving the efficiency of on-site equipment maintenance and reducing the difficulty and time cost of after-sales service.

[0033] An apparatus for implementing the aforementioned safe voltage high-power drinking water heating method includes an equipment control box 1, an input power cord 2, a temperature sensor 3, a heating plate 4, a waterproof sealing gasket 5, and a fixing flange 7. The input power cord 2 is used to introduce AC mains power and connect to the equipment control box 1. The heating plate 4 is connected to the DC safe voltage output terminal of the equipment control box 1 via an output power cord 8. The heating plate 4 is fixedly installed at the heating interface of the drinking water tank 6 via the fixing flange 7, and the waterproof sealing gasket 5 is installed between the heating plate 4 and the drinking water tank 6. The heating surface of the heating plate 4 is in direct contact with the water in the drinking water tank 6. The temperature sensor 3 is installed at the bottom of the inner wall of the drinking water tank 6, and the signal output terminal of the temperature sensor 3 is connected to the equipment control box 1.

[0034] Based on the above structural design, the present invention achieves the following advantages: 1. It adopts a safe DC voltage (DC 24V) power supply and outputs through an isolation circuit, which fundamentally avoids the risk of leakage and ensures the safety of human and animal use in humid environments.

[0035] 2. The heating plate is in direct contact with water, with a large heating area and high heat dissipation efficiency, effectively reducing scale formation and adhesion, extending the service life of the equipment, and avoiding the damage caused by scale buildup in traditional heating methods.

[0036] 3. The heating plate is connected via an aviation quick-connect plug, supporting quick disassembly and replacement; equipped with status indicator lights and a digital display circuit board, the temperature can be set intuitively and the working status can be monitored, simplifying the installation and operation process.

[0037] 4. It features a wide voltage input range (180V-260V), constant voltage control, power-on soft start, and electromagnetic interference filtering to ensure stable operation under voltage fluctuations or complex power environments. It also integrates fault detection and alarm for easy and quick maintenance.

[0038] The equipment control box 1 includes a control box body C and a leakage current protection switch A, a cable connector D, a status indicator light E, and a digital display circuit board F installed on the control box body C. The input terminal of the leakage current protection switch A is connected to the input power line 2, and the output terminal is connected to the power input terminal of the main circuit board B. The controlled power output terminal and the signal acquisition terminal of the main circuit board B are respectively connected to the output power line 8 and the temperature sensor 3 through the cable connector D. The digital display circuit board F and the status indicator light E are both communicatively connected to the main circuit board B and are used for parameter display, command input, and working status indication.

[0039] Based on the structural design of the equipment control box, the following advantages are achieved: 1. The main circuit board serves as the control core, uniformly processing temperature signals, outputting control commands, and driving digital displays and indicator lights. This enables precise closed-loop control of the heating process and intuitive display of the working status, making operation simple and control reliable.

[0040] 2. Standardized cable connectors are used for internal and external connections, resulting in a clear structure and standardized wiring. This not only facilitates production and assembly but also greatly simplifies subsequent maintenance and component replacement, thus improving the maintainability of the equipment.

[0041] The heating plate 4 is connected to the output power line 8 via an aviation quick connector.

[0042] A constant voltage control circuit is integrated within the equipment control box 1. This circuit samples the output voltage and feeds it back to the front-end control chip to adjust the conduction pulse width, ensuring that the load power of the heating plate 4 remains constant within a wide input voltage range of 180V to 260V. A power-on soft-start circuit is also integrated within the equipment control box 1. This circuit consists of a relay and a resistor connected in series. The resistor charges the electrolytic capacitor, and after a delay, the relay engages to short-circuit the resistor. This ensures that the heating plate receives a constant power output even when the mains voltage fluctuates (180V-260V), thereby guaranteeing the stability of the heating effect and effectively extending the service life of the heating device.

[0043] The input section of the device control box 1 is also equipped with an electromagnetic interference (EMI) filtering circuit. This EMI filtering circuit includes a common-mode inductor, a varistor, an X capacitor, and a Y capacitor. The common-mode inductor is connected in series with the live wire L and the neutral wire N of the input power line 2. On the output side of the common-mode inductor, the varistor and the X capacitor are connected in parallel between the live wire L and the neutral wire N. One end of each of the two Y capacitors is connected to the live wire L and the neutral wire N, respectively, and the other end is connected to the ground wire GND. This constitutes a multi-layered EMI protection system, which can effectively suppress the interference of high-frequency noise and instantaneous surges in the power grid on the internal circuit, and also prevent the electromagnetic interference generated by the device itself from leaking outward, ensuring stable operation in complex power environments and compliance with electromagnetic compatibility standards.

[0044] The working principle of this invention is as follows: 1. Power supply and preprocessing: The current first enters the electromagnetic interference filtering circuit (composed of common mode inductor, varistor, X capacitor and Y capacitor, etc.) of the input section of the equipment control box 1. This circuit filters out high-frequency noise and instantaneous surge interference in the power grid, and at the same time prevents the electromagnetic interference generated by the device itself from leaking out, ensuring that the subsequent circuits work in a clean and stable electrical environment.

[0045] 2. Safe Voltage Conversion and Power Control: After filtering, the AC power is supplied to the main circuit board B after primary leakage protection is provided by the leakage current protection switch A. The main circuit board B efficiently converts the high-voltage AC power into a safe DC 24V voltage. At the same time, the constant voltage control circuit continuously samples the output voltage and adjusts the conduction pulse width of the front-end control chip in real time through a feedback mechanism, thereby ensuring that the voltage and power output to the heating plate 4 remain constant even under a wide range of input voltage fluctuations of 180V-260V.

[0046] 3. Power-on and Initialization: Upon power-on, the power-on soft-start circuit (composed of a relay and a resistor in series) begins operation. The input current first flows through the current-limiting resistor to charge the large-capacity electrolytic capacitor downstream, effectively suppressing the huge inrush current. After a delay of approximately 2 seconds, the capacitor is fully charged, the relay engages, short-circuiting the current-limiting resistor, and the system enters full-power operation, thus protecting the power grid and internal components.

[0047] 4. Temperature Monitoring and Closed-Loop Control: Temperature sensor 3, installed at the bottom of the water tank 6, monitors the water temperature in real time and feeds the temperature signal back to the main circuit board B. The main circuit board B, as the control core, compares the received real-time temperature with the target temperature set by the user via buttons on the digital display circuit board F. Based on the comparison result, the main circuit board B precisely controls the DC 24V power output to the heating plate 4 (e.g., via PWM), forming a closed-loop temperature control system that allows the water temperature to quickly reach and stabilize at the set temperature.

[0048] 5. Safe heating and heat transfer: The heating plate 4 operates under a safe DC 24V voltage. Its heating surface is securely installed through the fixed flange 7 and is in direct contact with the water in the drinking trough 6. The two are sealed by a waterproof sealing gasket 5.

[0049] This direct contact heating method has high heat transfer efficiency, and because the heating plate 4 is made of 304 stainless steel and has a large surface area, heat can be transferred to the water quickly and evenly, while effectively reducing the formation and adhesion of scale.

[0050] 6. Status Display and Fault Protection: Throughout the entire operation, the status indicator light E and the digital display circuit board F will display information such as the current water temperature, set temperature, and operating status in real time, providing clear operational feedback to the user. If any functional abnormality occurs in the system, the fault detection and alarm unit built into the main circuit board B will be triggered, outputting a fault code through the status indicator light E or the digital display circuit board F, facilitating quick fault location and resolution.

[0051] 7. Convenient maintenance: When the heating plate 4 needs to be replaced or repaired, simply disconnect the aviation quick plug between it and the output power line 8 to achieve quick separation, which greatly simplifies the maintenance process.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A safe voltage, high-power drinking water heating method, characterized in that, Includes the following steps: S1. Connect to AC mains power and perform electromagnetic interference filtering and leakage protection. S2. Convert the filtered AC power into a safe DC voltage and maintain a stable output voltage through a constant voltage control circuit; S3. Upon power-up, the inrush current is suppressed by the soft-start circuit, and the system enters normal working state after initialization is completed; S4. Monitor the water temperature in the drinking tank in real time using a temperature sensor and feed the temperature signal back to the main control unit; S5. The main control unit adjusts the DC power output to the heating plate based on the difference between the set temperature and the real-time temperature to achieve closed-loop control of the water temperature; S6. The heating plate operates under a safe DC voltage, and its heating surface is in direct contact with the water in the water tank for heating. S7. During the heating process, the water temperature, set temperature and working status are displayed in real time, and a fault alarm signal is output when a functional abnormality is detected.

2. The safe voltage high-power drinking water heating method according to claim 1, characterized in that, The DC safety voltage is DC 24V.

3. The safe voltage high-power drinking water heating method according to claim 1, characterized in that, The constant voltage control circuit samples the output voltage and feeds it back to the front-end control chip to adjust the conduction pulse width, so that the load power of the heating plate remains constant within the range of input voltage from 180V to 260V.

4. The safe voltage high-power drinking water heating method according to claim 1, characterized in that, The soft-start circuit is implemented by connecting a relay and a resistor in series. When powered on, the electrolytic capacitor is charged through the resistor. After a delay, the relay is energized to short-circuit the resistor, thus completing the startup process.

5. The method according to claim 1, characterized in that, The heating plate is made of 304 stainless steel and is connected to the output power cord via an aviation quick-connect plug.

6. An apparatus for implementing the safe voltage high-power drinking water heating method according to any one of claims 1 to 5, characterized in that, The device includes a control box (1), an input power cord (2), a temperature sensor (3), a heating plate (4), a waterproof sealing gasket (5), and a fixing flange (7). The input power cord (2) is used to introduce AC mains power and connect to the control box (1). The heating plate (4) is connected to the DC safety voltage output terminal of the control box (1) through an output power cord (8). The heating plate (4) is fixedly installed at the heating interface of the water tank (6) through the fixing flange (7), and the waterproof sealing gasket (5) is installed between the heating plate (4) and the water tank (6). The heating surface of the heating plate (4) is in direct contact with the water in the water tank (6). The temperature sensor (3) is installed at the bottom of the inner wall of the water tank (6), and the signal output terminal of the temperature sensor (3) is connected to the control box (1).

7. The apparatus according to claim 6, characterized in that, The equipment control box (1) includes a control box body (C) and a leakage current protection switch (A), a cable connector (D), a status indicator (E), and a digital display circuit board (F) installed on the control box body (C). The input end of the leakage current protection switch (A) is connected to the input power line (2), and the output end is connected to the power input end of the main circuit board (B). The controlled power output end and the signal acquisition end of the main circuit board (B) are respectively connected to the output power line (8) and the temperature sensor (3) through the cable connector (D). The digital display circuit board (F) and the status indicator (E) are both communicatively connected to the main circuit board (B) for parameter display, command input, and working status indication.

8. A safe voltage high-power heating drinking water device according to claim 6 or 7, characterized in that, The heating plate (4) is connected to the output power line (8) via an aviation quick connector.

9. A safe voltage high-power heating drinking water device according to claim 8, characterized in that, A constant voltage control circuit is integrated in the equipment control box (1). The constant voltage control circuit samples the output voltage and feeds it back to the front-end control chip to adjust the conduction pulse width so that the load power of the heating plate (4) remains constant within a wide input voltage range of 180V to 260V. A power-on soft start circuit is integrated in the equipment control box (1). The power-on soft start circuit consists of a relay and a resistor connected in series. The electrolytic capacitor is charged through the resistor. After a delay, the relay is energized to short-circuit the resistor.

10. A safe voltage high-power heating drinking water device according to claim 7, characterized in that, The input section of the device control box (1) is also provided with an electromagnetic interference filtering circuit, which includes a common mode inductor, a varistor, an X capacitor and a Y capacitor. The live wire L and the neutral wire N of the input power line (2) are connected in series with the common mode inductor. On the output side of the common mode inductor, the varistor and the X capacitor are connected in parallel between the live wire L and the neutral wire N. One end of the two Y capacitors is connected to the live wire L and the neutral wire N respectively, and the other end is connected to the ground wire GND.

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