A heating control system, a heating control method and a control device

Abstract

The application discloses a heating control system, a heating control method and a control device, which comprise a power supply component and a control loop; the power supply component comprises a thyristor; two output ends of the thyristor are respectively used for connecting a heating core and a power line, and a control end of the thyristor is connected to the control loop; the control loop comprises a temperature switch, one end of the temperature switch is connected to a control signal, and the other end of the temperature switch is connected to the control end of the thyristor; the thyristor and the temperature switch are respectively arranged outside a hollow water-cooled radiator, and the water-cooled radiator is used for radiating the thyristor through an internal water flow. The application detects the temperature change of the thyristor at any time by adding the temperature switch, effectively controls the safe and effective operation of the equipment, and improves the water-cooled radiator from the traditional aluminum-copper radiating fin, so that the product volume is reduced and the application space utilization rate is effectively increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric water heater, in particular to a heating control system, a heating control method and a control device. BACKGROUND

[0002] Each enterprise, market, school and apartment and other places where people are concentrated are basically installed with electric water heater to provide drinking water service for people. The working mode of the current heating water tank is that the heating water amount of the water heater is controlled through the upper water level sensor of the water tank, so that the water level in the water tank reaches a fixed water level point; the water temperature is detected through a mechanical temperature controller or a temperature sensor, and then the power-on and power-off of the heating core are controlled. As long as the water level of the water tank is lower than the fixed water level point, the water heater starts to replenish water; as long as the water temperature is lower than the set temperature, the water heater starts to heat. The water heater continues to work all day long without interruption. However, in the existing heating water tank, a relay or a contact switch is often used to realize the turn-off and turn-on, which has a limited service life and affects the safety of the product, and the product with a traditional aluminum-copper heat sink has a large volume and cannot well meet the use demand of users. SUMMARY

[0003] The present application aims to provide a heating control system, a heating control method and a control device, which uses a thyristor to replace a traditional relay or contact switch to realize turn-on and turn-off, and uses a water-cooled radiator to dissipate heat of the thyristor, and uses a temperature switch to monitor the temperature of the thyristor at all times, so as to solve the problems of large volume of the existing heating water tank heating controller and low service life of the switch.

[0004] A heating control device, comprising:

[0005] a power supply assembly and a control assembly;

[0006] The power supply assembly comprises a thyristor;

[0007] Two output ends of the thyristor are respectively connected to a heating core and a power line, and a control end of the thyristor is connected to a control loop;

[0008] The control assembly comprises a temperature switch, one end of the temperature switch is connected to a control signal, and the other end is connected to the control end of the thyristor;

[0009] The thyristor and the temperature switch are respectively arranged outside a hollow water-cooled radiator, and the water-cooled radiator is used to dissipate heat of the thyristor through the internal water flow;

[0010] The temperature switch is used to enter a turn-on state or a turn-off state according to the temperature of the thyristor, so that the control signal controls the power supply loop to supply power in the turn-on state.

[0011] Furthermore, it also includes a tee, wherein the water-cooled radiator has an input end and an output end, the A end of the tee is connected to the output end of the water-cooled radiator, the B end of the tee is used to connect to the water inlet pipe of the water tank, the C end of the tee is the venting end, and a circulation solenoid valve is installed at the C end of the tee. The circulation solenoid valve opens or closes according to the state of the temperature switch, and the input end of the water-cooled radiator is used to connect to the water source supplying water to the water tank.

[0012] Furthermore, it also includes a switching circuit module, which is electrically connected to the circulating solenoid valve.

[0013] Furthermore, the switching circuit module is controlled by a control signal linked to a temperature switch. When the temperature switch is in the off state and the control signal is at a high level, the circulating solenoid valve opens.

[0014] Furthermore, the switching circuit module includes a transistor Q2 and a switching unit. The transistor Q2 and the control signal are linked to control the switching unit to turn on and off. The collector of the transistor Q2 is connected to the switching unit, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected between the temperature switch and the thyristor.

[0015] Furthermore, the switching unit includes a control signal, a voltage divider circuit composed of resistors R1 and R2, and a MOSFET Q1, wherein the gate electrode of the MOSFET Q1 and the collector electrode of the transistor Q2 are both connected between resistors R1 and R2.

[0016] Furthermore, the drain (D) of the MOSFET Q1 is connected to the control signal through the coil of the relay, and a diode is connected in reverse parallel across the two ends of the coil. The source (S) of the MOSFET Q1 is connected to ground.

[0017] Furthermore, the power supply line is a three-phase power supply line, with each phase power supply line connected to the heating element through a thyristor. One end of the temperature switch is connected to the control terminal of each of the three thyristors, and the other end of the temperature switch is connected to a control signal.

[0018] Furthermore, the thyristor is attached to the outer wall of the water-cooled radiator, and the two temperature switches are respectively installed on the outer wall of the water-cooled radiator between two adjacent thyristors.

[0019] A heating control system, comprising:

[0020] Power supply circuit and control circuit;

[0021] The power supply circuit includes a heating element, a thyristor, and a power line;

[0022] The two output terminals of the thyristor are respectively connected to the heating element and the power line, and the control terminal of the thyristor is connected to the control circuit;

[0023] The control loop includes a controller and a temperature switch, and the controller is connected to the control terminal of the thyristor through the temperature switch.

[0024] The thyristor and temperature switch are respectively arranged on the outside of the hollow water-cooled radiator, which is used to dissipate heat from the thyristor through the internal water flow.

[0025] The input end of the water-cooled radiator is connected to the water source supplying the water tank, and the output end of the water-cooled radiator is connected to the water inlet pipe of the water tank through a T-junction. The other end of the T-junction is connected to a circulation solenoid valve, which is controlled to close or open according to the on or off state of the temperature switch.

[0026] The temperature switch is used to enter the on or off state according to the temperature of the thyristor, so that the control signal in the control circuit controls the power supply circuit to supply power when the thyristor is in the on state.

[0027] A heating control method specifically includes the following steps:

[0028] Detect the continuity of the control loop;

[0029] When the temperature switch of the control loop is detected to be in the open state, a first control signal is generated to control the circulation solenoid valve to open, so that at least part of the water flowing through the water-cooled radiator is discharged through the circulation pipe, thereby achieving heat dissipation.

[0030] Furthermore, it also includes:

[0031] When the temperature switch in the control loop is detected to be in the on state, the working status of the water inlet solenoid valve is detected.

[0032] If the inlet solenoid valve is in the open state, a second control signal is generated to control the circulation solenoid valve to close.

[0033] The inlet solenoid valve is a built-in solenoid valve for the water tank heating system, used to control the water inlet to the tank according to the heating status. Figure 1 It was not shown in the middle.

[0034] The beneficial effects of this invention are as follows:

[0035] 1. The traditional aluminum and copper heat sinks have been replaced with water-cooled heat sinks, reducing the product size and effectively increasing the utilization of application space.

[0036] 2. Add a temperature switch to monitor the thyristor temperature change in real time, effectively controlling the equipment to operate within a safe temperature range.

[0037] 3. The water-cooled radiator absorbs the heat dissipated by the thyristor, effectively realizing the energy recovery function of the water circuit. The water-cooled radiator absorbs the heat dissipated by the thyristor, so that the water entering the hot water tank is preheated by the heat absorbed by the water-cooled radiator, thus realizing energy recovery and utilization. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0039] Figure 2 This is a schematic diagram of the heating control system structure of the present invention;

[0040] Figure 3 This is a schematic diagram of the control circuit structure of the circulating solenoid valve of the present invention. Figure 1 ;

[0041] Figure 4 This is a schematic diagram of the control circuit structure of the circulating solenoid valve of the present invention. Figure 2 ;

[0042] Figure 5 This is a schematic diagram of the controller circuit for controlling the circulating solenoid valve of the present invention.

[0043] Figure 6 This is a schematic diagram of the linkage control between the temperature switch and the control signal of the present invention; Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0046] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0047] Furthermore, for clarity and brevity, descriptions of well-known structures, functions, and configurations may have been omitted. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of this disclosure.

[0048] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0049] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0050] Example 1

[0051] A heating control device, comprising:

[0052] Power supply components and control components;

[0053] The power supply component includes a thyristor;

[0054] The two output terminals of the thyristor are used to connect the heating element and the power line, respectively, and the control terminal of the thyristor is connected to the control circuit.

[0055] The control component includes a temperature switch, one end of which is connected to a control signal and the other end is connected to the control terminal of a thyristor.

[0056] The thyristor and temperature switch are respectively arranged on the outside of the hollow water-cooled radiator, which is used to dissipate heat from the thyristor through the internal water flow.

[0057] The temperature switch is used to enter the on or off state according to the temperature of the thyristor, so that the control signal controls the power supply circuit to supply power when the thyristor is in the on state.

[0058] It should be noted that in the prior art, using thyristors for the shutdown of three-phase power is a conventional method. Because thyristors generate a large amount of heat in the circuit, water cooling is introduced to improve heat dissipation efficiency for circuit safety. However, the water flow in the water-cooled radiator needs to be constant, while the water flow in the water tank inlet pipe is intermittent or shut off. Therefore, using thyristors for the shutdown of the water tank heater requires solving the adaptation problem between the two different water flow states. Therefore, this application incorporates a temperature switch and a circulating solenoid valve. The temperature switch detects the temperature of the thyristor to achieve: 1. power supply and shutdown of the power supply circuit; 2. opening and closing of the circulating solenoid valve. This protects the safety of the power supply circuit while controlling the flow and shut-off of water inside the water-cooled radiator by opening and closing the circulating solenoid valve, thereby controlling the temperature of the thyristor.

[0059] In this application, the control logic for heating water in the water tank is existing technology and will not be described in detail here. This application only solves the problem of adapting the thyristor temperature control to the water tank water inlet status.

[0060] This product's temperature switch, thyristor, and water-cooled heat sink are tightly bonded together with a high thermal conductivity silicone sheet, increasing heat transfer efficiency and ensuring sufficient heat dissipation from the water-cooled heat sink, allowing the equipment to operate safely at room temperature. It uses water cooling to replace conventional large-volume aluminum or copper heat sinks, reducing size and making it easier to install in a space-saving layout.

[0061] The thyristors are cooled by water flow (liquid water has a specific heat capacity of 4.2 × 10^3 J / (kg*℃), which is more effective and stable than conventional aluminum or copper heat dissipation. Temperature switches are installed between adjacent thyristors to monitor temperature changes in real time. If the temperature exceeds the limit, the equipment is automatically disconnected, allowing it to enter a shutdown and cooling state. It will restart after the temperature returns to a safe range, ensuring safe operation of the equipment.

[0062] When the temperature switch detects a temperature ≥80℃, it will automatically disconnect the switch signal and stop working. When it detects a temperature <60℃, it will start working normally to ensure the safe operation of the equipment.

[0063] The use of thyristor control circuits instead of conventional contact circuits reduces startup noise and increases service life; zero-crossing triggering effectively solves the arc extinguishing problem.

[0064] It is beneficial for energy recovery. The water-cooled radiator absorbs the heat dissipated by the thyristor, so that the water entering the hot water tank is preheated by the heat absorbed by the water-cooled radiator, thus realizing energy recovery and utilization.

[0065] Example 2

[0066] Based on Example 1, the power supply line is a three-phase power supply line, and each phase power supply line is connected to the heating element through a thyristor. One end of the temperature switch is connected to the control terminal of the three thyristors, and the other end of the temperature switch is connected to the control signal.

[0067] Specifically, the thyristor is attached to the outer wall of the water-cooled radiator, and the two temperature switches are respectively installed on the outer wall of the water-cooled radiator between two adjacent thyristors.

[0068] Specifically, a tee is provided on the water inlet pipe, and a water inlet solenoid valve is also provided on the water inlet pipe. The water inlet and outlet valves are located between the tee and the water tank. The tee is also connected to the circulation pipe, and a circulation solenoid valve is provided on the circulation pipe.

[0069] The water-cooled radiator is a columnar heat dissipation tube, and both ends of the columnar heat dissipation tube are threadedly connected to the water inlet pipe.

[0070] Thyristors and temperature switches are mounted on the outer wall of the water-cooled radiator using high thermal conductivity silicone pads;

[0071] Preferably, the thyristors and temperature switches are arranged at intervals along the water flow direction on the outer wall of the water-cooled radiator.

[0072] It should be noted that when the thyristor is turned on, the power line provides AC power to the heating element, which energizes the heating element and causes it to heat up.

[0073] When the thyristor is turned off, the power line stops supplying AC power to the heating element, thereby de-energizing the heating element and stopping it from heating.

[0074] Specifically, it also includes a tee, the water-cooled radiator has an input end and an output end, the A end of the tee is connected to the output end of the water-cooled radiator, the B end of the tee is used to connect to the water inlet pipe of the water tank, the C end of the tee is the venting end, the C end of the tee is equipped with a circulation solenoid valve, the circulation solenoid valve is opened or closed according to the state of the temperature switch, and the input end of the water-cooled radiator is used to connect to the water source supplying water to the water tank.

[0075] Specifically, it also includes a switching circuit module, which is electrically connected to the circulating solenoid valve.

[0076] Specifically, the switching circuit module is controlled by a control signal and a temperature switch. When the temperature switch is in the off state and the control signal is at a high level, the circulating solenoid valve opens.

[0077] Specifically, the switching circuit module includes a transistor Q2 and a switching unit. The transistor Q2 and the control signal are linked to control the switching unit to turn on and off. The collector of the transistor Q2 is connected to the switching unit, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected between the temperature switch and the thyristor.

[0078] Specifically, the switching unit includes a control signal, a voltage divider circuit composed of resistors R1 and R2, and a MOSFET Q1. The gate electrode of the MOSFET Q1 and the collector electrode of the transistor Q2 are both connected between resistors R1 and R2.

[0079] Specifically, the drain (D) of the MOSFET Q1 is connected to the control signal through the coil of the relay, and a diode is connected in reverse parallel across the two ends of the coil. The source (S) of the MOSFET Q1 is connected to ground.

[0080] It should be noted that this application controls the operating state of the circulating solenoid valve through a temperature switch and a control signal linkage. The base of the transistor Q2 is connected in parallel with the thyristor to one end of the temperature switch. When the temperature switch is in the open state, the control signal is 12V, and the circulating solenoid valve is in the open state, such as... Figure 6As described above, when the temperature switch is in the open state, transistor Q2 is turned off, and MOSFET Q1 is turned on under the action of the 12V control signal, thereby realizing the conduction of the circulating solenoid valve circuit. When the temperature switch is in the on state, transistor Q2 is turned on, and the Vgs voltage of MOSFET Q1 is approximately zero. At this time, MOSFET Q1 is turned off, thereby realizing the turn-off of the circulating solenoid valve circuit.

[0081] In one embodiment, as an extended solution, the base of transistor Q2 is connected to the controller. It should be noted that the control signal required by the base of transistor Q2 can be output from a controller pin. Alternatively, the base of transistor Q2 can be connected in parallel with a thyristor to one end of a temperature switch. The temperature switch's off-state controls the cutoff and on-state of transistor Q2, thereby driving the cutoff and on-state of MOSFET Q1, thus realizing the on / off state of the circulating solenoid valve.

[0082] The controller needs to control the circulating solenoid valve and the high-power heating control circuit. This application drives other high-power loads by driving relays.

[0083] According to the control principle, the circulating solenoid valve will only open when the controller determines that the temperature switch is off. Based on this logic, the relay contact should be normally open, so that it can be energized only when needed. That is, the above connection terminals are the two ends of the relay coil.

[0084] To control both the opening and closing actions of the circulating solenoid valve, the corresponding drive relay should also only have two states: energized and de-energized. Therefore, the transistor used to drive the relay should also only have two states: on and off. Thus, it can be inferred that in the controller's control circuit for the circulating solenoid valve, the transistor acts as a "switch".

[0085] The operation of the circulating solenoid valve can be controlled by simply connecting one of its two voltage input lines to the normally open contact of the relay. As long as the relay can be normally engaged, power will be applied to the input terminal of the circulating solenoid valve, thereby driving the circulating solenoid valve to conduct and start the flow of water for cooling the water-cooled radiator.

[0086] Signals are obtained through water level electrodes and high-precision temperature sensors in the water tank. The controller then performs precise temperature and water control calculations to control the operation of the heating element and the circulation solenoid valve.

[0087] Preferably, the thyristor is a bidirectional thyristor.

[0088] Preferably, an electrical coupler is provided between the temperature switch and each thyristor.

[0089] In the heating control circuit, the high-power three-phase electricity will generate strong electromagnetic interference in the control system. Therefore, opto-isolation is required to reduce interference to the microcontroller. In addition, the heating action occurs frequently, so a control switch with good controllability is required to connect and disconnect the three-phase electricity.

[0090] The controller judges the corresponding water level signal and then sends a heating control signal (this heating control signal includes a stop heating signal and a start heating signal). This heating control signal can control the conduction and cutoff of the optocoupler. The conduction and cutoff of the optocoupler directly affect the bidirectional thyristor. If the optocoupler is on, the bidirectional thyristor is on, and vice versa.

[0091] In existing technologies, the 8051 microcontroller is often used as the controller. The microcontroller acquires temperature signals, controls the on / off state of relays, and indirectly controls whether the heating element is heating to control the temperature. Liquid level signals are detected and processed to control the opening and closing of solenoid valves, thus controlling the liquid level. On the other hand, if the microcontroller detects a leakage signal, it will immediately control the circuit breaker to disconnect the power supply to the main circuit, thus providing protection. The working principle of the water heater: After the water level signal is acquired, it needs to be converted according to the signal type, into a level signal that can be directly input to the microcontroller. This level signal serves as the input to the microcontroller, driving the internal program to run, thereby controlling the water replenishment and heating operations. The water replenishment and heating actions affect the water level in the tank, so it is necessary to continuously monitor the cold and hot water levels in the tank and promptly feed back these changes to the pre-designed program within the microcontroller, which then further influences the water replenishment and heating control.

[0092] The heating element only enters its working state, i.e., heating state, after being supplied with 380V three-phase power. Controlling the on / off state of the 380V three-phase AC power is the core of the entire heating control design. In daily life and production, there are many methods for controlling the on / off state of AC power, such as using relays, high-power transistors, unidirectional thyristors (CSRs), and bidirectional thyristors (TRIACs). With the development of electronic control technology, bidirectional thyristors have become a more ideal AC power control switch. Nowadays, bidirectional thyristors are often used to control high power and high current. A bidirectional thyristor (TRIAC) is a semiconductor power device, also known as a bidirectional thyristor. The difference between a bidirectional thyristor and a unidirectional thyristor is that once a unidirectional thyristor is turned on, it cannot be turned off by an external signal, while a bidirectional thyristor can conduct regardless of forward or reverse voltage, making it a bidirectional device with its own turn-off characteristics. It does not have the problem of reverse voltage withstand, and the control circuit is simple, therefore it is often used in AC control circuits. Bidirectional thyristors are typically connected to high-power electrical devices (such as 380V heating elements), serving as the control hub between the high-voltage network and the high-power appliances. However, they are often triggered by a small gate signal. Since the control of high-voltage systems is often accompanied by strong electromagnetic interference, many requirements are placed on the interference immunity of the thyristor's triggering circuit. Especially in microcontroller control systems, due to the limited interference immunity of the microcontroller itself, opto-isolators are usually used to electrically isolate the microcontroller control system from the high-voltage network. Furthermore, to reduce drive power and electromagnetic interference generated by the thyristor during triggering, zero-crossing triggering is used for thyristors in AC control circuits. The three terminals of a bidirectional thyristor are T1, T2, and G. Regardless of whether the voltage at terminals T1 and T2 is positive or negative, as long as there is sufficient gate voltage, the two terminals are in a conducting state; conversely, if the gate voltage is removed, the thyristor will be cut off at the zero-crossing point of the AC current due to the applied reverse voltage.

[0093] Example 3

[0094] A heating control method specifically includes the following steps:

[0095] Detect the continuity of the control loop;

[0096] When the temperature switch of the control loop is detected to be in the open state, a first control signal is generated to control the circulation solenoid valve to open, so that at least part of the water flowing through the water-cooled radiator is discharged through the circulation pipe, thereby achieving heat dissipation.

[0097] Specifically, it also includes:

[0098] When the temperature switch in the control loop is detected to be in the on state, the working status of the water inlet solenoid valve is detected.

[0099] If the inlet solenoid valve is in the open state, a second control signal is generated to control the circulation solenoid valve to close.

[0100] Example 4

[0101] Power supply circuit and control circuit;

[0102] The power supply circuit includes a heating element, a thyristor, and a power line;

[0103] The two output terminals of the thyristor are respectively connected to the heating element and the power line, and the control terminal of the thyristor is connected to the control circuit;

[0104] The control loop includes a controller and a temperature switch, and the controller is connected to the control terminal of the thyristor through the temperature switch.

[0105] The thyristor and temperature switch are respectively arranged on the outside of the hollow water-cooled radiator, which is used to dissipate heat from the thyristor through the internal water flow.

[0106] The input end of the water-cooled radiator is connected to the water source supplying the water tank, and the output end of the water-cooled radiator is connected to the water inlet pipe of the water tank through a T-junction. The other end of the T-junction is connected to a circulation solenoid valve, which is controlled to close or open according to the on or off state of the temperature switch.

[0107] The temperature switch is used to enter the on or off state according to the temperature of the thyristor, so that the control signal in the control circuit controls the power supply circuit to supply power when the thyristor is in the on state.

[0108] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A heating control device, characterized in that, include: Power supply components and control components; The power supply component includes a thyristor; The two output terminals of the thyristor are used to connect the heating element and the power line, respectively, and the input terminal of the thyristor is connected to the control circuit. The control component includes a temperature switch, one end of which is connected to a control signal and the other end is connected to the input terminal of a thyristor. The thyristor and temperature switch are respectively arranged on the outside of the hollow water-cooled radiator, which is used to dissipate heat from the thyristor through the internal water flow. The temperature switch is used to enter the on or off state according to the temperature of the thyristor, so that the control signal controls the power supply component to supply power in the on state. It also includes a switching circuit module, which is electrically connected to the circulating solenoid valve; The circulating solenoid valve is controlled to close or open depending on the on or off state of the temperature switch; It also includes a tee, the water-cooled radiator has an input end and an output end, the A end of the tee is connected to the output end of the water-cooled radiator, the B end of the tee is used to connect to the water inlet pipe of the water tank, the C end of the tee is the venting end, the C end of the tee is equipped with a circulation solenoid valve, the circulation solenoid valve is opened or closed according to the state of the temperature switch, and the input end of the water-cooled radiator is used to connect to the water source supplying water to the water tank; The switching circuit module is controlled by a control signal and a temperature switch. When the temperature switch is in the open state and the control signal is at a high level, the circulation solenoid valve opens so that at least part of the water flowing through the water-cooled radiator is discharged through the circulation pipe, thereby achieving heat dissipation. The thyristor is attached to the outer wall of the water-cooled radiator, and the two temperature switches are respectively installed on the outer wall of the water-cooled radiator between two adjacent thyristors.

2. The heating control device according to claim 1, characterized in that, The switching circuit module includes a transistor Q2 and a switching unit. The transistor Q2 and the control signal are linked to control the switching unit to turn on and off. The collector of the transistor Q2 is connected to the switching unit, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected between the temperature switch and the thyristor.

3. The heating control device according to claim 1, characterized in that, The switching unit includes a control signal, a voltage divider circuit consisting of resistors R1 and R2, and a MOSFET Q1. The gate electrode of the MOSFET Q1 and the collector electrode of the transistor Q2 are both connected between resistors R1 and R2.

4. The heating control device according to claim 1, characterized in that, The power supply line is a three-phase power supply line, and each phase power supply line is connected to the heating element through a thyristor. One end of the temperature switch is connected to the control terminal of the three thyristors, and the other end of the temperature switch is connected to the control signal.

5. A heating control method based on the heating control device according to claim 1, characterized in that, Specifically, the following steps are included: Detect the continuity of the control loop; When the temperature switch of the control loop is detected to be in the off state, a first control signal is generated to control the circulation solenoid valve to open, so that at least part of the water flowing through the water-cooled radiator is discharged through the circulation pipe, thereby achieving heat dissipation.

6. A heating control system, characterized in that, include: Power supply circuit and control circuit; The power supply circuit includes a heating element, a thyristor, and a power line; The two output terminals of the thyristor are respectively connected to the heating element and the power line, and the input terminal of the thyristor is connected to the control circuit. The control loop includes a controller and a temperature switch. The controller is connected to the input terminal of the thyristor through the temperature switch. One end of the temperature switch is connected to a control signal, and the other end is connected to the input terminal of the thyristor. The thyristor and temperature switch are respectively arranged on the outside of the hollow water-cooled radiator, which is used to dissipate heat from the thyristor through the internal water flow. The input end of the water-cooled radiator is connected to the water source supplying water to the water tank. The output end of the water-cooled radiator is connected to end A of the tee. End B of the tee is connected to the water inlet pipe of the water tank. End C of the tee is connected to a circulation solenoid valve. The circulation solenoid valve is controlled to close or open according to the on or off state of the temperature switch. The temperature switch is used to enter the on or off state according to the temperature of the thyristor, so that the control signal in the control circuit controls the power supply circuit to supply power when the thyristor is in the on state. It also includes a switching circuit module, which is electrically connected to a circulating solenoid valve; the circulating solenoid valve is controlled to close or open according to the on or off state of the temperature switch. The switching circuit module is controlled by a control signal and a temperature switch. When the temperature switch is in the open state and the control signal is at a high level, the circulation solenoid valve opens so that at least part of the water flowing through the water-cooled radiator is discharged through the circulation pipe, thereby achieving heat dissipation. The thyristor is attached to the outer wall of the water-cooled radiator, and the two temperature switches are respectively installed on the outer wall of the water-cooled radiator between two adjacent thyristors.

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