Circuit, method and apparatus for protecting a heating component, storage medium

Abstract

The application relates to the technical field of electric heating, and discloses a circuit for protecting a heating component, which comprises a breakdown protection circuit, a detection circuit and a control module. The breakdown protection circuit comprises a control end and an output end, the output end is connected with the heating component, and the output end outputs a signal for controlling the start and stop of the heating component under the control of the control end. The detection circuit comprises a detection input end and a detection output end, the detection circuit is connected with the heating component and the breakdown protection circuit through the detection input end, and the detection output end is used for outputting a detected voltage value of the heating component. The control module is electrically connected with the control end of the breakdown protection circuit and the detection output end of the detection circuit, respectively, is used for receiving the voltage value of the heating component, and controls the breakdown protection circuit to output the signal for controlling the start and stop of the heating component according to the voltage value of the heating component. The reliability of the protection of the heating component is improved through the above-mentioned circuit. The application further discloses a method and device for protecting a heating component and a storage medium.

Description

Technical Field

[0001] This application relates to the field of electric heating technology, such as a circuit, method, apparatus, and storage medium for protecting heating components. Background Technology

[0002] Currently, a thyristor is a semiconductor power electrical component used in automatic control systems as a high-power driver, enabling the control of high-power equipment with a low-power control. It boasts advantages such as simple structure, high functionality, and light weight. However, it also has drawbacks, including the potential for overload and poor anti-interference capabilities. When controlling large inductive loads, it can cause interference with the power grid and self-interference, and in severe cases, thyristor breakdown. A broken-down thyristor will remain uncontrollably conductive, posing a significant danger, especially to high-temperature equipment like drying ovens, where uncontrolled temperature control can be extremely dangerous.

[0003] In related technologies, by setting a power detection circuit, an over-temperature detection circuit, a trigger detection circuit, and a breakdown detection circuit on the driver board, the two anti-parallel connected thyristors and the driver board itself can be monitored. The power detection circuit is used to detect whether the voltage input to the driver board is normal, the over-temperature detection circuit is used to detect whether the thyristor is over-temperature, the trigger detection circuit is used to provide feedback on the trigger information of the thyristor, and the breakdown detection circuit is used to detect whether the thyristor is broken down.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] This protection measure can indeed protect the thyristor, but the above scheme does not provide a specific method for detecting whether the thyristor has been damaged by a breakdown detection circuit. Furthermore, even with the addition of this circuit, the thyristor can still be damaged in certain special cases. In these situations, the traditional protection circuit fails, therefore the reliability of the above circuit is insufficient. Summary of the Invention

[0006] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0007] This disclosure provides a circuit, method, apparatus, and storage medium for protecting heating components, thereby improving the reliability of heating component protection.

[0008] In some embodiments, the circuit for protecting the heating component includes: a breakdown protection circuit, including a control terminal and an output terminal, the output terminal being connected to the heating component and the output terminal being controlled to output a signal controlling the start and stop of the heating component; a detection circuit, including a detection input terminal and a detection output terminal, the detection circuit being connected to the heating component and the breakdown protection circuit through the detection input terminal, and the detection output terminal being used to output the detected voltage value of the heating component; and a control module, electrically connected to the control terminal of the breakdown protection circuit and the detection output terminal of the detection circuit, respectively, for receiving the voltage value of the heating component and controlling the breakdown protection circuit to output a signal controlling the start and stop of the heating component based on the voltage value of the heating component.

[0009] Optionally, the breakdown protection circuit includes: an optocoupler, with the anode of the light source connected to the first power supply via a fourth current-limiting resistor, the cathode of the light source connected to the control module, the output terminal of the light receiver connected to the heating element via a second current-limiting resistor, and the input terminal of the light receiver connected to the live wire via a third current-limiting resistor; used to control the on / off state of the breakdown protection circuit according to the signal from the control module; a thyristor, with its input terminal connected to the heating element, its output terminal connected to the live wire, and its control terminal connected to the output terminal of the light receiver of the optocoupler, used to connect or disconnect the connection between the live wire and the heating element; and a varistor, connected in parallel to the input and output terminals of the thyristor, used to prevent damage to the thyristor caused by excessive instantaneous voltage.

[0010] Optionally, the detection circuit includes: a transformer, the primary side of which is connected to the input terminal of the thyristor and the heating element; a rectifier and filter circuit, the input terminal of which is connected to the secondary side of the transformer, used to convert the AC voltage signal transmitted by the transformer into a DC voltage signal and output it after filtering; a series voltage divider circuit, the input terminal of which is connected to the output terminal of the rectifier and filter circuit, used to divide the DC voltage signal; and a voltage regulator circuit, the input terminal of which is connected to the output terminal of the series voltage divider circuit, and the output terminal of which is connected to the control module, used to ensure the stability of the DC voltage signal after voltage division.

[0011] Optionally, the rectifier and filter circuit includes: a bridge rectifier circuit, the input of which is connected to the secondary side of the transformer, for converting the AC voltage signal transmitted by the transformer into a DC voltage signal; and a filter capacitor, which is connected in parallel to the output of the bridge rectifier circuit, for outputting the DC voltage signal after filtering.

[0012] Optionally, the series voltage divider circuit includes: a variable resistor network, the input of which is connected to the input of the filter capacitor, for dividing the DC voltage signal; and a sensing resistor, one end of which is connected to the output of the variable resistor network and the other end of which is connected to the output of the filter capacitor; wherein the signal after voltage division by the variable resistor network and the sensing resistor is input to the control module.

[0013] Optionally, the variable resistance network includes: a voltage regulator connected to the sensing resistor for adjusting the voltage across the sensing resistor; and a voltage stabilizing resistor connected in parallel with the voltage regulator for maintaining the stability of the voltage across the sensing resistor.

[0014] The voltage regulator circuit includes: a first current-limiting resistor, one end of which is connected between the variable resistor network and the sensing resistor, and the other end of which is connected to the control module, for current limiting and voltage division; a Zener diode, the cathode of which is connected to the first current-limiting resistor and the anode of which is connected to the sensing resistor, for ensuring the stability of the DC voltage signal after voltage division; and a Zener capacitor, which is connected in parallel with the Zener diode, for improving the stability of the Zener diode's output voltage.

[0015] In some embodiments, the above method includes: detecting the voltage value of the heating element; and when the voltage value of the heating element is greater than a voltage threshold and continues for a set time, the breakdown protection circuit outputs a signal to control the heating element to stop operating.

[0016] In some embodiments, the above-described apparatus includes a control module and a memory storing program instructions, wherein the control module is configured to execute the above-described method for protecting the heating component when the program instructions are executed.

[0017] In some embodiments, the storage medium stores program instructions that, when executed, perform the method for protecting the heating component as described above.

[0018] The circuits, methods, apparatus, and storage media for protecting heating components provided in this disclosure can achieve the following technical effects:

[0019] A detection circuit connected in parallel with the heating element acquires the voltage value of the heating element, which determines whether the circuit is in a conductive state. If the voltage value indicates that the protection circuit should not be operating, it is considered that the circuit may be damaged. In this case, the breakdown protection circuit is disconnected to prevent damage to the heating element caused by circuit breakdown, thus improving the reliability of the heating element protection.

[0020] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0022] Figure 1-1 This is a schematic diagram of a circuit for protecting a heating component provided in an embodiment of this disclosure;

[0023] Figure 1-2 This is a schematic diagram of another circuit for protecting a heating component provided in an embodiment of this disclosure;

[0024] Figure 2 This is a schematic diagram of a breakdown protection circuit for protecting a heating component provided in an embodiment of this disclosure;

[0025] Figure 3 This is a schematic diagram of a detection circuit for protecting a heating component provided in an embodiment of this disclosure;

[0026] Figure 4 This is a schematic diagram of a method for protecting a heating component provided in an embodiment of this disclosure;

[0027] Figure 5 This is a schematic diagram of another method for protecting a heating component provided in an embodiment of this disclosure;

[0028] Figure 6 This is a schematic diagram of a device for protecting a heating component provided in an embodiment of this disclosure. Detailed Implementation

[0029] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0030] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0031] Unless otherwise stated, the term "multiple" means two or more.

[0032] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0033] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0034] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0035] Combination Figure 1-1 and Figure 1-2 As shown, this embodiment of the disclosure provides a protection circuit for protecting a heating component. The protection circuit includes a control module 200, a breakdown protection circuit 210, a heating component 220, and a detection circuit 230. The breakdown protection circuit 210 includes a control terminal and an output terminal. The output terminal is connected to the heating component 220 and outputs a signal to control the start and stop of the heating component 220. The detection circuit 230 includes a detection terminal and a detection output terminal. The detection circuit 230 is connected in parallel with the heating component 220 to the output terminal of the breakdown protection circuit 210 via the detection terminal. The detection output terminal outputs the detected voltage value of the heating component. The control module 200 is electrically connected to both the control terminal of the breakdown protection circuit 210 and the detection output terminal of the detection circuit 230. The control module 200 can receive the voltage value of the heating component and control the breakdown protection circuit 210 to output a signal to control the start and stop of the heating component 220 based on the voltage value.

[0036] Combination Figure 2 As shown, this embodiment of the disclosure provides a breakdown protection circuit for protecting a heating component. The breakdown protection circuit includes an optocoupler MOC3601, a silicon controlled rectifier (SCR) Q1, and a varistor RV1. The SCR Q1 is disposed between the first live wire endpoint L1 and the second live wire endpoint L2, bridging the live wire, and is used to turn the breakdown protection circuit on or off from the live wire. Furthermore, one end of the heating component is connected to the second live wire endpoint L2, and the other end is connected to the neutral wire N. Thus, the SCR Q1 enables the control of a high-power device with a low-power control. The photodetector output of the optocoupler MOC3601 is connected between the SCR Q1 and the heating component through a second current-limiting resistor R2, and the photodetector input is connected to the second live wire endpoint L2 through a third current-limiting resistor R3. The light source anode is connected to a first power supply through a fourth current-limiting resistor R5, and the light source cathode is connected to the HEAT pin of the control module, used to power the control module and control the on / off state of the breakdown protection circuit according to the instructions of the control module. One end of the varistor RV1 is connected to the first live wire terminal L1, and the other end is connected to the second live wire terminal L2 to form a parallel connection with the thyristor Q1, in order to prevent damage to the thyristor Q1 caused by excessive instantaneous voltage.

[0037] Alternatively, the thyristor model can be BAT26800B or other models, which will not be elaborated here.

[0038] Combination Figure 3As shown in the figure, this disclosure provides a detection circuit for protecting a heating component. The detection circuit includes a transformer VT1, a rectifier-filter circuit, a series voltage divider circuit, and a voltage regulator circuit. The primary winding of the transformer VT1 is connected to the input terminal of the thyristor Q1 and the heating component. The input terminal of the rectifier-filter circuit is connected to the secondary winding of the transformer, used to convert the AC voltage signal transmitted through the transformer VT1 into a DC voltage signal and output it after filtering. The input terminal of the series voltage divider circuit is connected to the output terminal of the rectifier-filter circuit, used to divide the DC voltage signal. The input terminal of the voltage regulator circuit is connected to the output terminal of the series voltage divider circuit, and the output terminal is connected to a control module to ensure the stability of the divided DC voltage signal. Furthermore, the rectifier-filter circuit includes: a bridge rectifier circuit connected to the secondary winding of the transformer VT1 to convert the AC voltage signal transmitted through the transformer into a DC voltage signal; and a filter capacitor E1 connected in parallel to the output terminal of the bridge rectifier circuit to output the DC voltage signal after filtering. The series voltage divider circuit includes: a variable resistor network connected to the input of the filter capacitor E1 to divide the DC voltage signal; a resistor R7 to be tested connected at one end to the output of the variable resistor network and at the other end to the output of the filter capacitor E1; and the signal after voltage division by the variable resistor network and the resistor R7 to be tested is input to the control module. The variable resistor network includes a voltage regulator VR1 connected in series with the resistor R7 to adjust the voltage across the resistor R7. A voltage regulator R6 is connected in parallel with the voltage regulator VR1 to maintain the stability of the voltage across the resistor R7. The voltage regulator circuit includes: a current-limiting resistor R1 connected at one end between the variable resistor network and the resistor R7, and at the other end connected to the control module, which serves to limit the current and divide the voltage; and a Zener diode ZD1 with its cathode connected to the current-limiting resistor R1 and its anode connected to the resistor R7 to ensure the stability of the DC voltage signal after voltage division. And, a voltage regulator capacitor C1 connected in parallel with the Zener diode ZD1 to improve the stability of the output voltage of the Zener diode ZD1.

[0039] Specifically, the AC voltage signal between the live and neutral wires Lin and Nin is stepped down by transformer VT1, and then rectified into a DC voltage signal by diode rectifier bridge D1-D2-D3-D4. The large-capacitance filter capacitor E1 filters out noise of different frequencies based on its capacitance characteristics. A larger capacitance value results in a lower filtering frequency; for example, this capacitor can filter noise at a frequency of 50Hz. The sliding rheostat VR1 (also called a voltage regulator) and the stabilizing resistor R6 are connected in parallel, forming a variable resistance network. This network is then connected to the sensing resistor R7 to form a series voltage divider circuit. According to the series voltage divider principle, changing the resistance value of the voltage regulator VR1 changes the voltage across the sensing resistor R7, thus obtaining the voltage across the heating element by detecting the voltage across R7. One end of the first current-limiting resistor R1 is connected between the variable resistance network and the sensing resistor R7, and the other end is connected to the control module, serving as a current-limiting voltage divider. The cathode of Zener diode ZD1 is connected to the first current-limiting resistor R1, and the anode is connected to the sensing resistor R7 to ensure voltage stability. Zener capacitor C1 is connected in parallel with Zener diode ZD1 to improve the stability of the output voltage of Zener diode ZD1 and avoid interference signals.

[0040] Combination Figure 4 As shown, this disclosure provides a method for protecting a heating component, comprising:

[0041] S01, the detection circuit detects the voltage value of the heating component.

[0042] S02, when the voltage value of the heating element is greater than the voltage threshold and continues for a set time, the breakdown protection circuit outputs a signal to control the heating element to stop operating.

[0043] The method for protecting a heating component provided in this disclosure can determine whether the circuit is in a conducting state by acquiring the voltage value of the heating component detected by the detection circuit. Since the heating component is not continuously operating, the method detects whether the heating component is in normal operating condition by setting a duration. Therefore, if the voltage value is greater than the voltage threshold and continues for the set duration, it is determined that the thyristor has broken down. At this time, the breakdown protection circuit is controlled to disconnect, that is, the optocoupler in the entire breakdown protection circuit is controlled to disconnect. By comprehensively judging whether the thyristor has broken down by the heating component voltage value and the set duration, the reliability of the heating component is improved. For example, taking a set duration of 10 seconds as an example, based on the temperature difference between the current temperature and the target temperature of the heating component, a PID (Proportional Integral Differential) control command is output to control the heating component to run for 3 seconds, that is, the heating component voltage value is greater than the voltage threshold for 3 seconds. In the next cycle, the running time of the heating component may be 5 seconds or 2 seconds, etc., and the heating time may be extended accordingly due to the actual operating state. However, the running time of the heating component will not exceed the set duration of 10 seconds. If the heating element runs for more than 10 seconds, the thyristor is considered to have broken down.

[0044] Optionally, the detection circuit detects the voltage value of the heating component, including: the control module acquiring the current sampling information collected by the detection circuit; the control module determining the sampling voltage corresponding to the input AC voltage based on the sampling information; and the control module determining the actual supply voltage corresponding to the sampling voltage as the voltage value of the heating component.

[0045] This improves the accuracy of the voltage value of the heating element detected by the detection circuit. The detection circuit can acquire a sampling voltage signal that matches the AC voltage supplied, thus obtaining the corresponding sampling voltage. The sampling process can be performed periodically or in real-time, with each sample acquiring the current sampling voltage signal and the current sampling voltage. This ensures the real-time performance and reliability of the voltage value of the heating element detected by the detection circuit.

[0046] Optionally, before the control module acquires the current sampling information collected by the detection circuit, the method further includes: the control module acquiring the correspondence between the output voltage and the input voltage of the detection circuit. The control module saves the correspondence as a correspondence between the sampled voltage and the actual power supply voltage.

[0047] This approach ensures that the voltage values ​​of the heating components detected by the detection circuit match the actual situation in multiple ways. For example, multiple experimental tests can be conducted to obtain multiple input voltages and their corresponding output voltages of the detection circuit, establishing a correspondence between the output and input voltages, and saving this correspondence between the sampled voltages and the actual power supply voltage. Alternatively, multiple input voltage samples and their corresponding output voltages can be obtained through network communication, experimental testing, or numerical input, followed by machine learning to obtain and save the correspondence between the sampled voltages and the actual power supply voltage.

[0048] Optionally, the control module determines the voltage threshold by: acquiring the supply voltage value at the start time of the set duration; and determining the voltage threshold based on the supply voltage value.

[0049] The method for protecting heating components provided in this disclosure improves the accuracy of determining whether a silicon controlled rectifier (SCR) has been damaged. A set duration is used as the detection cycle, and the supply voltage value at the start of each cycle is periodically acquired. The voltage threshold for that cycle is determined based on the acquired supply voltage value, thereby ensuring accurate determination of whether the SCR has been damaged regardless of the heating component's operating state.

[0050] Optionally, the control module determines the voltage threshold based on the supply voltage, including: the control module obtains a correction parameter based on the current running time. The control module sets the product of the supply voltage value and the correction parameter as the voltage threshold.

[0051] This improves the accuracy of determining whether a thyristor has broken down. Due to high power demand, the supply voltage can become unstable. Determining the voltage threshold solely based on the actual supply voltage can be affected by variations in operating time. Therefore, a fluctuation parameter reflecting the current voltage fluctuation is determined based on the current operating time. This fluctuation parameter is used to correct the actual supply voltage, resulting in a voltage threshold more consistent with the equipment's actual operating conditions. For example, with 220V AC mains, if the mains voltage fluctuation range is [198, 242]V, the correction parameter is 10%. Multiplying the supply voltage value at the start of the set time period by 10% yields the voltage threshold for that detection cycle. Furthermore, since the location of the heating element also affects the supply voltage, different correction parameters can be set based on the location, or both the location and the heating element's operating time can be used. This further improves the accuracy of determining whether a thyristor has broken down.

[0052] Combination Figure 5 As shown, this disclosure provides another method for protecting a heating component, including:

[0053] S01, the detection circuit detects the voltage value of the heating component.

[0054] S02, when the voltage value of the heating element is greater than the voltage threshold and continues for a set time, the breakdown protection circuit outputs a signal to control the heating element to stop operating.

[0055] S04, the control module sends the corresponding warning information of the thyristor being broken down to the user.

[0056] The method for protecting heating components provided in this disclosure allows users to promptly monitor the current operating status of the equipment. Warning messages can be sent wirelessly or via application software to the user's mobile phone or smartwatch, or via text prompts on a display screen, audio prompts, or a combination of these methods.

[0057] Combination Figure 6 As shown, this disclosure provides an apparatus for protecting a heating component, including a control module 200 and a memory 101. Optionally, the apparatus may further include a communication interface 102 and a bus 103. The control module 200, communication interface 102, and memory 101 can communicate with each other via the bus 103. The communication interface 102 can be used for information transmission. The control module 100 can call logical instructions in the memory 101 to execute the method for protecting the heating component described in the above embodiment.

[0058] Furthermore, the logic instructions in the aforementioned memory 101 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0059] The memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The control module 200 executes functional applications and data processing by running the program instructions / modules stored in the memory 101, that is, it implements the method for protecting the heating component in the above embodiments.

[0060] The memory 101 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and may also include non-volatile memory.

[0061] This disclosure provides a storage medium storing computer-executable instructions configured to perform the above-described method for protecting a heating component.

[0062] The aforementioned storage medium can be either transient or non-transient.

[0063] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0064] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0065] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0066] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0067] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A circuit for protecting a heating component, characterized in that, include: The breakdown protection circuit includes a control terminal and an output terminal. The output terminal is connected to the heating element and outputs a signal that controls the start and stop of the heating element. The detection circuit includes a detection input terminal and a detection output terminal. The detection circuit is connected to the heating component and the breakdown protection circuit through the detection input terminal, and the detection output terminal is used to output the detected voltage value of the heating component. The control module is electrically connected to the control terminal of the breakdown protection circuit and the detection output terminal of the detection circuit, respectively, and is used to receive the voltage value of the heating component and control the breakdown protection circuit to output a signal to control the start and stop of the heating component according to the voltage value of the heating component. The function of controlling the breakdown protection circuit to output a signal to control the start and stop of the heating component based on the voltage value of the heating component includes: when the voltage value of the heating component is greater than a voltage threshold and continues for a set duration, the breakdown protection circuit outputs a signal to control the heating component to stop operating. The detection circuit includes: a transformer, the primary side of which is connected to the input terminal of the thyristor in the breakdown protection circuit and the heating component; a rectifier and filter circuit, the input terminal of which is connected to the secondary side of the transformer, for converting the AC voltage signal transmitted by the transformer into a DC voltage signal and outputting it after filtering; a series voltage divider circuit, the input terminal of which is connected to the output terminal of the rectifier and filter circuit, for dividing the DC voltage signal; and a voltage regulator circuit, the input terminal of which is connected to the output terminal of the series voltage divider circuit, and the output terminal of which is connected to the control module, for ensuring the stability of the DC voltage signal after voltage division. The control module is also used to output control commands via PID control based on the temperature difference between the current temperature and the target temperature of the heating element, so as to control the heating element to operate intermittently; the set duration is greater than the maximum single operation duration of the heating element under the PID control.

2. The circuit according to claim 1, characterized in that, The breakdown protection circuit includes: An optocoupler is used to control the on / off state of the breakdown protection circuit according to the signal from the control module. The anode of the light source is connected to the first power supply through a fourth current-limiting resistor, the cathode of the light source is connected to the control module, the output terminal of the light receiver is connected to the heating component through a second current-limiting resistor, and the input terminal of the light receiver is connected to the live wire through a third current-limiting resistor. A silicon controlled rectifier (SCR) has its input terminal connected to the heating element, its output terminal connected to the live wire, and its control terminal connected to the photodetector output terminal of the optocoupler. It is used to connect or disconnect the connection between the live wire and the heating element. A varistor is connected in parallel to the input and output terminals of the thyristor to prevent damage to the thyristor caused by excessive instantaneous voltage.

3. The circuit according to claim 2, characterized in that, The rectifier and filter circuit includes: A bridge rectifier circuit, with its input terminal connected to the secondary side of the transformer, is used to convert the AC voltage signal transmitted by the transformer into a DC voltage signal. A filter capacitor is connected in parallel to the output terminal of the bridge rectifier circuit to filter the DC voltage signal before outputting it.

4. The circuit according to claim 3, characterized in that, The series voltage divider circuit includes: A variable resistance network, with its input terminal connected to the input terminal of the filter capacitor, is used to divide the DC voltage signal. The sensing resistor has one end connected to the output terminal of the variable resistance network and the other end connected to the output terminal of the filter capacitor. The signal obtained by voltage division between the variable resistance network and the detection resistor is input to the control module.

5. The circuit according to claim 4, characterized in that, The variable resistance network includes: A voltage regulator, connected to the sensing resistor, is used to adjust the voltage across the sensing resistor. A voltage-stabilizing resistor is connected in parallel with the voltage regulator to maintain the stability of the voltage across the sensing resistor.

6. The circuit according to claim 5, characterized in that, The voltage regulator circuit includes: The first current-limiting resistor has one end connected between the variable resistance network and the detection resistor, and the other end connected to the control module, and is used for current limiting and voltage division. A Zener diode, with its cathode connected to the first current-limiting resistor and its anode connected to the detection resistor, is used to ensure the stability of the DC voltage signal after voltage division. A voltage-regulating capacitor is connected in parallel with the voltage-regulating diode to improve the stability of the output voltage of the voltage-regulating diode.

7. A method for protecting a heating component, characterized in that, The heating element has a protection circuit as described in any one of claims 1 to 6; the method includes: Detect the voltage value of the heating element; When the voltage value of the heating element is greater than the voltage threshold and remains so for a set duration, the breakdown protection circuit outputs a signal to control the heating element to stop operating.

8. A device for protecting a heating component, comprising a control module and a memory storing program instructions, characterized in that, The control module is configured to execute the method for protecting the heating component as described in claim 7 when running the program instructions.

9. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the method for protecting the heating component as described in claim 7.

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