Thermal protection method of equipment, electric equipment and fan heater

Abstract

The embodiment of the invention relates to a thermal protection method of equipment, electric equipment and a fan heater. The method provided by the embodiment of the invention comprises the following steps: acquiring a first voltage at a first time, and taking the first voltage as a reference voltage; acquiring a second voltage at a second time; whether the difference value between the second voltage and the reference voltage is smaller than a preset first difference value or not is judged; if yes, performing the step S4; starting a dummy load, obtaining a third voltage at a third time, and judging whether a difference value between the third voltage and the reference voltage is greater than a preset second difference value or not; and if yes, outputting a thermal protection control signal. According to the thermal protection method of the equipment, the thermal protection control signal can be output so as to realize thermal protection measures such as alarm and the like, a user is reminded of disconnection of the plug temperature control switch, and misjudgment can be effectively prevented.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of thermal protection of equipment, and in particular, to a thermal protection method for equipment, electrical equipment, and a heater. Background Art

[0002] The power plug and the socket are generally contact-connected, and it is easy for the contact resistance between the power plug and the socket to increase and cause poor contact. When the contact resistance increases, a large current will pass through the plug, causing heat to form, causing the plug to melt or even catch fire, posing a certain safety risk.

[0003] In order to solve this problem, a Chinese utility model patent with announcement number CN211719903U discloses a plug structure with a built-in thermal protector, whose circuit automatically disconnects when the temperature is too high and automatically connects when the temperature is low. It can play a certain protective role and can be reused.

[0004] However, when the temperature of the plug is too high, the low current loads such as the alarm cannot work because the power is completely cut off, so that safety measures such as alarm cannot be implemented. For this reason, the Chinese invention patent application with publication number CN 115954723 A discloses a power plug, which includes a thermal circuit breaker and a protective resistor in parallel. When the high temperature causes the thermal circuit breaker to cut off the circuit, the protective resistor can continue to supply power to the low current load and the microcontroller unit MCU (Microcontroller Unit), so that the MCU can alarm through the alarm and disconnect the high power load when the power supply voltage is detected to be lower than the normal power supply voltage. However, it is easy to misjudge when using this plug. Summary of the invention

[0005] The embodiments of the present application provide a thermal protection method and device for equipment, electrical equipment, and a heater to solve at least one of the above-mentioned technical problems.

[0006] In a first aspect, an embodiment of the present application provides a thermal protection method for a device, which, when a first event occurs, comprises the following steps:

[0007] S1: Acquire a first voltage at a first time, and use the first voltage as a reference voltage;

[0008] S2: Obtaining a second voltage at a second time;

[0009] S3: Determine whether the difference between the second voltage and the reference voltage is less than a preset first difference;

[0010] If yes, proceed to step S4;

[0011] S4: turning on the dummy load, obtaining a third voltage at a third time, and determining whether a difference between the third voltage and the reference voltage is greater than a preset second difference;

[0012] If yes, proceed to step S5;

[0013] S5: Output thermal protection control signal.

[0014] Optionally, the following steps are also included:

[0015] If the difference between the second voltage and the reference voltage is not less than a preset first difference, it is determined that a second event occurs.

[0016] Optionally, the following steps are also included:

[0017] If the difference between the second voltage and the reference voltage is not less than the preset first difference, repeat steps S1-S3 to obtain a new first voltage and update the reference voltage to the new first voltage, obtain a new second voltage, determine whether the difference between the new second voltage and the new reference voltage is less than the preset first difference, and end after repeating the preset number of times.

[0018] Optionally, the step S5 further includes: determining that a third event occurs.

[0019] Optionally, the first event is a processor reset or power-on of a power-consuming device.

[0020] Optionally, the second event is that a power plug of the electrical device shakes.

[0021] Optionally, the third event is that a plug temperature control switch in a power plug of the electrical device is disconnected.

[0022] In a second aspect, an embodiment of the present application provides a thermal protection device for a device, comprising:

[0023] an acquisition module, configured to acquire a first voltage at a first time when a first event occurs,

[0024] A definition module, configured to use the first voltage as a reference voltage;

[0025] The acquisition module is also used to acquire a second voltage at a second time;

[0026] A judging module, used for judging whether the difference between the second voltage and the reference voltage is less than a preset first difference;

[0027] A start-up module, used for starting the dummy load when the difference between the second voltage and the reference voltage is less than a preset first difference;

[0028] The acquisition module is further used to acquire a third voltage at a third time after the dummy load is turned on.

[0029] The judging module is further used to judge whether the difference between the third voltage and the reference voltage is greater than a preset second difference;

[0030] The output module is used to output a thermal protection control signal when the difference between the third voltage and the reference voltage is greater than a preset second difference.

[0031] Optionally, also include:

[0032] The first determination module is used to determine that a second event occurs when the difference between the second voltage and the reference voltage is not less than a preset first difference.

[0033] Optionally, also include:

[0034] A repetition module is used to obtain a new first voltage and update the reference voltage to the new first voltage when the difference between the second voltage and the reference voltage is not less than the preset first difference, obtain a new second voltage, determine whether the difference between the new second voltage and the new reference voltage is less than the preset first difference, and end after repeating a preset number of times.

[0035] Optionally, also include:

[0036] The second determination module is used to determine that a third event occurs when the difference between the third voltage and the reference voltage is greater than a preset second difference.

[0037] In a third aspect, an embodiment of the present application provides an electric device, including:

[0038] A memory for storing program instructions;

[0039] The processor is used to call the program instructions stored in the memory and execute the thermal protection method of the device described in the first aspect of the embodiment of the present application according to the obtained program.

[0040] In a fourth aspect, an embodiment of the present application provides an electric device, including:

[0041] A power line, which includes a live line and a neutral line;

[0042] A power plug connected to one end of the power cord for accessing the mains, the power plug comprising a plug protection resistor and a plug temperature control switch connected in parallel to the live wire;

[0043] The device body is connected to the other end of the power cord,

[0044] The device body includes a device thermostat, a voltage detection circuit, a processor, a dummy load, and a memory;

[0045] The device temperature controller includes a device protection resistor and a device temperature control switch connected in parallel to the live wire;

[0046] The voltage detection circuit has an input end connected to the live wire and located between the power plug and the device thermostat;

[0047] The voltage detection port of the processor is connected to the voltage detection circuit;

[0048] The dummy load has one end connected to the processor;

[0049] The memory is used to store program instructions;

[0050] The processor is used to call the program instructions stored in the memory and execute the thermal protection method for the device described in the first aspect of the embodiment of the present application according to the obtained program.

[0051] Optionally, the voltage detection circuit includes a diode, a first voltage-dividing resistor, and a second voltage-dividing resistor connected in series, and the voltage detection port of the processor is connected to a sampling point between the first voltage-dividing resistor and the second voltage-dividing resistor;

[0052] The voltage detection circuit further includes a filter capacitor connected in parallel with the second voltage-dividing resistor, and / or a third voltage-dividing resistor connected between the voltage detection port of the processor and a sampling point.

[0053] In a fifth aspect, an embodiment of the present application provides a heater, comprising:

[0054] A power line, which includes a live line and a neutral line;

[0055] A power plug connected to one end of the power cord for accessing the mains, the power plug comprising a plug protection resistor and a plug temperature control switch connected in parallel to the live wire;

[0056] The heater body is connected to the other end of the power cord.

[0057] The heater body includes a device thermostat, a voltage detection circuit, a processor, a dummy load, and a memory;

[0058] The device temperature controller includes a device protection resistor and a device temperature control switch connected in parallel to the live wire;

[0059] The voltage detection circuit has an input end connected to the live wire and located between the power plug and the device thermostat;

[0060] The voltage detection port of the processor is connected to the voltage detection circuit;

[0061] The dummy load has one end connected to the processor;

[0062] The memory is used to store program instructions;

[0063] The processor is used to call the program instructions stored in the memory and execute the thermal protection method for the device described in the first aspect of the embodiment of the present application according to the obtained program.

[0064] In an embodiment of the present application, if a first event occurs during the operation of the electrical equipment, the first voltage is obtained and used as a reference voltage, and the obtained second voltage is compared with the reference voltage to determine whether the difference between the two is less than the preset first difference. If so, the dummy load is turned on and the third voltage is obtained, and the obtained third voltage is compared with the reference voltage to determine whether the two are greater than the preset second difference. If so, a thermal protection control signal is output to implement thermal protection measures such as alarms to remind the user that the plug temperature control switch is disconnected, and misjudgment can be effectively prevented.

[0065] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A flowchart of a method for thermal protection of a device provided in an exemplary embodiment;

[0067] Figure 2 A schematic structural diagram of a thermal protection device for a device provided in an exemplary embodiment;

[0068] Figure 3 A schematic diagram of the structure of an electric device provided in an exemplary embodiment;

[0069] Figure 4 The present invention is a schematic diagram of a partial circuit structure of an electrical device or a heater provided in an exemplary embodiment. DETAILED DESCRIPTION

[0070] In order to make the objectives, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0071] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0072] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0073] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0074] In addition, in the description of this application, unless otherwise specified, "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0075] The power plug and the socket are generally contact-connected, and it is easy for the contact resistance between the power plug and the socket to increase and cause poor contact. When the contact resistance increases, a large current will pass through the plug, causing heat to form, causing the plug to melt or even catch fire, posing a certain safety risk.

[0076] In order to solve this problem, a Chinese utility model patent with announcement number CN211719903U discloses a plug structure with a built-in thermal protector, whose circuit automatically disconnects when the temperature is too high and automatically connects when the temperature is low. It can play a certain protective role and can be reused.

[0077] However, when the temperature of the plug is too high, the power supply is completely cut off, so low current loads such as alarms cannot work, making it impossible to implement safety measures such as alarms.

[0078] To this end, a Chinese invention patent application with publication number CN 115954723 A discloses a power plug, which includes a thermal circuit breaker and a protective resistor connected in parallel. When the high temperature causes the thermal circuit breaker to cut off the circuit, the protective resistor can continue to supply power to the low-current load and the MCU, so that the MCU can alarm through an alarm and disconnect the high-power load when the power supply voltage is detected to be lower than the normal power supply voltage.

[0079] However, it is easy to misjudge when using this plug solution. Specifically, when the thermal circuit breaker is disconnected and the power supply voltage drops temporarily, it will trigger the control board power reset and MCU reset at the same time, resulting in register state loss and MUC reinitialization. At this time, the power-consuming device is in standby mode, which is equivalent to the power-consuming device just being powered on.

[0080] At this time, if the two voltages detected before and after the MCU reset are compared to determine whether the circuit breaker is disconnected, the MCU register state will be lost, that is, the voltage data detected before the reset will be lost, and the current voltage detected after the MCU reset will lose the comparison object, making it impossible to make a judgment.

[0081] If the two voltages detected after the MCU is reset are compared, it is impossible to make a judgment because the two voltages do not change significantly.

[0082] If the current voltage detected by the MCU is compared with the preset value, a misjudgment may occur due to the numerous reasons causing the control board power reset and the MCU reset, that is, an alarm error may be given when the circuit breaker is not disconnected.

[0083] In other words, it is not possible to determine whether the thermal circuit breaker is disconnected by simply comparing the current voltage with the normal supply voltage, and thus it is not possible to trigger the thermal protection measures.

[0084] To this end, the present application provides a thermal protection method and device for equipment, electrical equipment, and a heater that can effectively prevent misjudgment.

[0085] Figure 1 A device thermal protection method according to an exemplary embodiment of the present application comprises the following steps when a first event occurs:

[0086] S1: Acquire a first voltage at a first time, and use the first voltage as a reference voltage.

[0087] During normal operation, the processor can monitor the voltage flowing through the power plug in real time according to the preset detection cycle to obtain the power supply voltage flowing through the power plug. When the plug temperature control switch is not disconnected, the plug temperature control switch and the plug protection resistor are connected in parallel on the live wire of the power cord. At this time, the processor, taking the MCU as an example, can obtain the current power supply voltage through the voltage detection circuit monitoring; when the power supply voltage drops rapidly, the MCU can detect the current power supply voltage change again. If the voltage drop is too large, the MCU will reset the power supply due to undervoltage, causing the method of judging whether the plug temperature control switch is disconnected and alarming by voltage comparison to fail or misjudge.

[0088] In the embodiment of the present application, the first event is a processor reset or a power-consuming device power-on, and the processor is preferably an MCU.

[0089] When a first event occurs, the embodiment of the present application first obtains a first voltage at a first time, and uses the first voltage as a reference voltage. The first time is a certain time after the processor is reset or the power-consuming device is powered on, which can be a certain moment or a certain time interval; due to the occurrence of the first event such as the processor being reset or the power-consuming device being powered on, the power-consuming device is in a standby state at this time, and the first voltage is a standby voltage.

[0090] Specifically, taking the case where the MCU is reset by power, this is equivalent to the power-on of the electrical device, and the electrical device is in a standby state. The MCU returns to the initial state after the power reset occurs, and the MCU obtains the standby voltage at this time at the first time, and uses the detected standby voltage as the reference voltage. Preferably, the first voltage is the first voltage AD value after AD conversion.

[0091] S2: Obtain a second voltage at a second time.

[0092] Specifically, in the above example, the MCU detects the power supply voltage after flowing through the power plug according to a preset detection cycle. The second time can be understood as the second voltage detected in a preset detection cycle after the first time. It should be understood that the second voltage detected at this time is still the standby voltage.

[0093] S3: Determine whether the difference between the second voltage and the reference voltage is less than a preset first difference.

[0094] Specifically, after detecting the second voltage, it is determined whether the difference between the second voltage and the reference voltage is less than a preset first difference. For example, the preset first difference is 3 AD values, and the MCU determines whether the difference between the AD value of the reference voltage and the AD value of the second voltage is less than 3 AD values.

[0095] In some embodiments, the following step 31 is also included: if not, it is determined that a second event has occurred. The second event is that the power plug of the electrical device is shaking. That is, if the difference between the second voltage and the reference voltage is not less than the preset first difference, it is determined that the second event has occurred. Continuing with the above example, when the difference between the two is not less than 3 AD values, the power supply voltage fluctuates greatly during standby mode, and it is determined that the power plug of the electrical device is shaking, so as to at least exclude some factors that can cause voltage drop, so as to improve the accuracy of the judgment and prevent misjudgment.

[0096] In some other embodiments, the following step 32 is further included: if the difference between the second voltage and the reference voltage is not less than the preset first difference, the above steps S1-S3 are repeated to obtain a new first voltage and update the reference voltage to the new first voltage, obtain a new second voltage, determine whether the difference between the new second voltage and the new reference voltage is less than the preset first difference, and end after repeating the preset number of times. This step can effectively eliminate instantaneous voltage fluctuations caused by unstable mains voltage, etc., and prevent misjudgment caused by instantaneous fluctuations.

[0097] In other embodiments, the thermal protection method of the present application includes both steps 31 and 32 described above.

[0098] If yes, proceed to the next step. Continuing with the previous example, when the difference between the two is less than 3 AD values, proceed to the next step.

[0099] S4: Turn on the dummy load, obtain a third voltage at a third time, and determine whether a difference between the third voltage and the reference voltage is greater than a preset second difference.

[0100] Specifically, if the difference between the second voltage and the reference voltage is less than the preset first difference and less than 3 AD values, the MCU controls to turn on the dummy load. After the dummy load is turned on, the power supply voltage flowing through the power plug starts to power the dummy load, simulating the operation of the real load, which on the one hand provides the possibility for subsequent thermal protection judgment, and on the other hand can effectively protect the safety of the real load. In some embodiments, the dummy load is connected to the switching power supply circuit, and the dummy load is not shown in the drawings without affecting the understanding.

[0101] Further, a third voltage at a third time is obtained. Specifically, after the dummy load is turned on, the circuit starts to supply power normally, and a third voltage at a third time is further obtained. It should be understood that the third time is a preset detection cycle after the dummy load is turned on. The third voltage is the power supply voltage after the dummy load flows through the power plug after the dummy load is turned on.

[0102] Further, it is determined whether the difference between the third voltage and the reference voltage is greater than a preset second difference. The preset second difference and the difference between the third voltage and the reference voltage are used to determine whether the plug temperature control switch is disconnected.

[0103] If the difference between the third voltage and the reference voltage is not greater than the preset second difference, the execution procedure of the thermal protection method is terminated and exited. Specifically, if the voltage change difference is small and basically unchanged, it means that the plug temperature control switch is not disconnected at this time.

[0104] If the difference between the third voltage and the reference voltage is greater than the preset second difference, proceed to the next step.

[0105] S5: Output thermal protection control signal.

[0106] Specifically, when the difference between the third voltage and the reference voltage is greater than the preset second difference, the MCU outputs a thermal protection control signal to achieve thermal protection of the electrical equipment. The thermal protection control signal can be a display control signal, an alarm control signal, a communication connection signal, etc., to display fault information on a display screen, control an alarm to sound an alarm, or send a prompt message to a terminal device that is connected to the electrical equipment for communication.

[0107] In some implementations, the step S5 further includes: determining that a third event occurs. The third event is that a plug temperature control switch in a power plug of the electrical device is disconnected.

[0108] In an embodiment of the present application, if a first event occurs during the operation of the electrical equipment, the first voltage is obtained and used as a reference voltage, and the obtained second voltage is compared with the reference voltage to determine whether the difference between the two is less than the preset first difference. If so, the dummy load is turned on and the third voltage is obtained, and the obtained third voltage is compared with the reference voltage to determine whether the two are greater than the preset second difference. If so, a thermal protection control signal is output to implement thermal protection measures such as alarms to remind the user that the plug temperature control switch is disconnected, and misjudgment can be effectively prevented.

[0109] In some examples, before step S3, the method further includes: determining whether the plug shaking time exceeds a preset shaking time, and if not, proceeding to step S3, so as to further eliminate the voltage drop caused by the plug shaking.

[0110] Figure 2 1 is a schematic diagram of a thermal protection device for a device provided in an exemplary embodiment of the present application. The device 100 includes:

[0111] The acquisition module 110 is used to acquire a first voltage at a first time when a first event occurs.

[0112] A definition module 120, configured to use the first voltage as a reference voltage;

[0113] The acquisition module is also used to acquire a second voltage at a second time;

[0114] A judging module 130, configured to judge whether a difference between the second voltage and a reference voltage is less than a preset first difference;

[0115] A start-up module 140, configured to start the dummy load when the difference between the second voltage and the reference voltage is less than a preset first difference;

[0116] The acquisition module is further used to acquire a third voltage at a third time after the dummy load is turned on.

[0117] The judging module is further used to judge whether the difference between the third voltage and the reference voltage is greater than a preset second difference;

[0118] The output module 150 is used to output a thermal protection control signal when the difference between the third voltage and the reference voltage is greater than a preset second difference.

[0119] The first event is a processor reset or a power-consuming device power-on.

[0120] In an exemplary embodiment, the apparatus 100 further includes: a first determination module 160, configured to determine that a second event occurs when the difference between the second voltage and the reference voltage is not less than a preset first difference, wherein the second event is that a power plug of the electrical device shakes.

[0121] In an exemplary embodiment, the device 100 also includes: a repetition module 170, which is used to obtain a new first voltage and update the reference voltage to the new first voltage when the difference between the second voltage and the reference voltage is not less than the preset first difference, obtain a new second voltage, determine whether the difference between the new second voltage and the new reference voltage is less than the preset first difference, and end after repeating a preset number of times.

[0122] In an exemplary embodiment, the device 100 further includes: a second determination module 180, configured to determine that a third event occurs when the difference between the third voltage and the reference voltage is greater than a preset second difference, wherein the third event is that a plug temperature control switch in a power plug of the electrical device is disconnected.

[0123] In an embodiment of the present application, if a first event occurs during the operation of the electrical equipment, the first voltage is obtained and used as a reference voltage, and the obtained second voltage is compared with the reference voltage to determine whether the difference between the two is less than the preset first difference. If so, the dummy load is turned on and the third voltage is obtained, and the obtained third voltage is compared with the reference voltage to determine whether the two are greater than the preset second difference. If so, a thermal protection control signal is output to implement thermal protection measures such as alarms to remind the user that the plug temperature control switch is disconnected, and misjudgment can be effectively prevented.

[0124] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0125] like Figure 3 As shown, an embodiment of the present application further provides an electrical device, which includes: a memory 233 for storing program instructions; a processor 232 for calling the program instructions stored in the memory, and executing the thermal protection method of the device described in any one of the exemplary embodiments of the present application corresponding to the above embodiments according to the obtained program.

[0126] The electric device 200 further includes a bus connecting a memory 233 and a processor 232 .

[0127] like Figure 4 As shown, the embodiment of the present application further provides an electric device 200, and the electric device 200 includes:

[0128] A power line 210, which includes a live line L and a neutral line N;

[0129] A power plug 220, which is connected to one end of the power line to access the mains, and the power plug includes a plug protection resistor 221 and a plug temperature control switch 222 connected in parallel to the live wire;

[0130] The device body 230 is connected to the other end of the power line.

[0131] The device body includes a device temperature controller 231, a voltage detection circuit, a processor 232, and a dummy load 234;

[0132] The device temperature controller 231 includes a device protection resistor 2311 and a device temperature control switch 2312 connected in parallel to the live wire.

[0133] The voltage detection circuit has an input end connected to the live wire and located between the power plug and the device thermostat. By connecting the input end between the power plug and the device thermostat, it is ensured that the detected power supply voltage is the power supply voltage after flowing through the power plug, and the voltage drop is also caused by the power plug, preventing the inability to distinguish whether the voltage drop is caused by the power plug or the device thermostat when the voltage drop occurs.

[0134] The voltage detection port of the processor 232 is connected to the voltage detection circuit;

[0135] One end of the dummy load 234 is connected to the processor.

[0136] In some embodiments, the plug protection resistor 221 and the device protection resistor 2311 may be a resistor or a PTC. The plug temperature control switch 222 and the device temperature control switch 2312 are in a normally closed state and are disconnected when the temperature is high.

[0137] In some embodiments, such as in the implementation scheme of the non-isolated power supply, in the embodiment of the present application, one end of the dummy load is connected to the live wire, and the other end is connected to the neutral wire in common with the power supply port of the processor to form a voltage detection loop. Figure 4 As shown, a common line connection point is provided between the control board and the device thermostat 231, which is used for the dummy load and the power supply port of the processor to be connected to the neutral line in common line.

[0138] The dummy load 235 may be a resistor.

[0139] The voltage detection circuit 232 includes a diode D1, a first voltage-dividing resistor R1, and a second voltage-dividing resistor R2 connected in series, and the voltage detection port of the processor is connected to a sampling point between the first voltage-dividing resistor and the second voltage-dividing resistor;

[0140] The voltage detection circuit further includes a filter capacitor C connected in parallel with the second voltage-dividing resistor, and / or a third voltage-dividing resistor R3 connected between the voltage detection port of the processor and a sampling point.

[0141] The electrical device 200 includes a memory 233 for storing program instructions; the processor 232 is used to call the program instructions stored in the memory and execute the thermal protection method of the device in any one of the exemplary embodiments of the present application corresponding to the above embodiments according to the obtained program. Preferably, the processor 232 is an MCU.

[0142] The electric device 200 further includes a bus connecting a memory 233 and a processor 232 .

[0143] Specifically, when a first event such as MCU power reset occurs, the voltage is supplied to the detection port of the MCU from the sampling point after passing through the diode D1, the first voltage-dividing resistor R1, and the second voltage-dividing resistor R2 to obtain the first and second voltages.

[0144] When it is determined that the second voltage is less than the first difference, the dummy load is controlled to be turned on, that is, the voltage detection loop is turned on, and then the third voltage is obtained through the MCU detection port for comparison and judgment.

[0145] The electrical equipment may be a high-power electrical equipment such as a heater.

[0146] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the processor and memory described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0147] The present application also provides a heater, referring to Figure 4 , the heater comprises:

[0148] A power line, which includes a live line and a neutral line;

[0149] A power plug connected to one end of the power cord for accessing the mains, the power plug comprising a plug protection resistor and a plug temperature control switch connected in parallel to the live wire;

[0150] The heater body is connected to the other end of the power cord.

[0151] Wherein, the heater body includes a device thermostat, a voltage detection circuit, a processor, and a dummy load;

[0152] The device temperature controller includes a device protection resistor and a device temperature control switch connected in parallel to the live wire;

[0153] The voltage detection circuit has an input end connected to the live wire and located between the power plug and the device thermostat;

[0154] The voltage detection port of the processor is connected to the voltage detection circuit;

[0155] One end of the dummy load is connected to the processor.

[0156] In some embodiments, the plug protection resistor and the device protection resistor may be a resistor or a PTC. The plug temperature control switch and the device temperature control switch are in a normally closed state and are disconnected when the temperature is high.

[0157] In some embodiments, such as in an implementation scheme of a non-isolated power supply, in an embodiment of the present application, one end of the dummy load is connected to the live wire, and the other end is connected to the neutral wire in common with the power supply port of the processor to form a voltage detection loop.

[0158] The dummy load may be a resistor.

[0159] The voltage detection circuit includes a diode D1, a first voltage-dividing resistor R1, and a second voltage-dividing resistor R2 connected in series, and the voltage detection port of the processor is connected to a sampling point between the first voltage-dividing resistor and the second voltage-dividing resistor;

[0160] The voltage detection circuit further includes a filter capacitor C connected in parallel with the second voltage-dividing resistor, and / or a third voltage-dividing resistor R3 connected between the voltage detection port of the processor and a sampling point.

[0161] The heater includes a memory for storing program instructions; the processor is used to call the program instructions stored in the memory and execute the thermal protection method of the device in any one of the exemplary embodiments of the present application corresponding to the above embodiments according to the obtained program. Preferably, the processor is an MCU.

[0162] The heater also includes a bus connecting the memory and the processor.

[0163] Specifically, when a first event such as MCU power reset occurs, the voltage is supplied to the detection port of the MCU from the sampling point after passing through the diode D1, the first voltage-dividing resistor R1, and the second voltage-dividing resistor R2 to obtain the first and second voltages.

[0164] When it is determined that the second voltage is less than the first difference, the dummy load is controlled to be turned on, that is, the voltage detection loop is turned on, and then the third voltage is obtained through the MCU detection port for comparison and judgment.

[0165] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the processor and memory described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0166] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0167] The structure of the circuit defined in the above method steps is the same as the structural principle of the circuit in the aforementioned device embodiment, and will not be repeated here. It should be understood that the embodiments of the present application are not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the embodiments of the present application is limited only by the attached claims.

[0168] The above-mentioned embodiments only express several implementation methods of the embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the embodiments of the present application, and these all belong to the protection scope of the embodiments of the present application.

Claims

1. A thermal protection method for equipment, characterized in that: When the first event occurs, the following steps are included: S1: Acquire a first voltage at a first time, and use the first voltage as a reference voltage; S2: Obtaining a second voltage at a second time; S3: Determine whether the difference between the second voltage and the reference voltage is less than a preset first difference; If yes, proceed to step S4; S4: turning on the dummy load, obtaining a third voltage at a third time, and determining whether a difference between the third voltage and the reference voltage is greater than a preset second difference; If yes, proceed to step S5; S5: Output thermal protection control signal.

2. The thermal protection method for equipment according to claim 1, characterized in that: The following steps are also included: If the difference between the second voltage and the reference voltage is not less than a preset first difference, it is determined that a second event occurs.

3. The thermal protection method for equipment according to claim 1, characterized in that: The following steps are also included: If the difference between the second voltage and the reference voltage is not less than the preset first difference, repeat steps S1-S3 to obtain a new first voltage and update the reference voltage to the new first voltage, obtain a new second voltage, determine whether the difference between the new second voltage and the new reference voltage is less than the preset first difference, and end after repeating the preset number of times.

4. The thermal protection method for equipment according to claim 1, characterized in that: The step S5 further includes: determining that a third event occurs.

5. The thermal protection method for equipment according to claim 1, characterized in that: The first event is that the processor is reset or the power-consuming device is powered on.

6. The thermal protection method for equipment according to claim 2, characterized in that: The second event is that the power plug of the electrical device shakes.

7. The thermal protection method for equipment according to claim 4, characterized in that: The third event is that the plug temperature control switch in the power plug of the electrical device is disconnected.

8. An electrical device, characterized in that: include: A memory for storing program instructions; A processor is used to call the program instructions stored in the memory, and execute the thermal protection method of the device according to any one of claims 1 to 7 according to the obtained program.

9. An electrical device, characterized in that: include: A power line, which includes a live line and a neutral line; A power plug connected to one end of the power cord for accessing the mains, the power plug comprising a plug protection resistor and a plug temperature control switch connected in parallel to the live wire; The device body is connected to the other end of the power cord, The device body includes a device thermostat, a voltage detection circuit, a processor, a dummy load, and a memory; The device temperature controller includes a device protection resistor and a device temperature control switch connected in parallel to the live wire; The voltage detection circuit has an input end connected to the live wire and located between the power plug and the device thermostat; The voltage detection port of the processor is connected to the voltage detection circuit; The dummy load has one end connected to the processor; The memory is used to store program instructions; The processor is used to call the program instructions stored in the memory, and execute the thermal protection method of the device according to any one of claims 1 to 7 according to the obtained program.

10. A fan heater, characterized in that: include: A power line, which includes a live line and a neutral line; A power plug connected to one end of the power cord for accessing the mains, the power plug comprising a plug protection resistor and a plug temperature control switch connected in parallel to the live wire; The heater body is connected to the other end of the power cord. The heater body includes a device thermostat, a voltage detection circuit, a processor, a dummy load, and a memory; The device temperature controller includes a device protection resistor and a device temperature control switch connected in parallel to the live wire; The voltage detection circuit has an input end connected to the live wire and located between the power plug and the device thermostat; The voltage detection port of the processor is connected to the voltage detection circuit; The dummy load has one end connected to the processor; The memory is used to store program instructions; The processor is used to call the program instructions stored in the memory, and execute the thermal protection method of the device according to any one of claims 1 to 7 according to the obtained program.

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