Thick film heater protection control method and device

Abstract

The invention provides a thick film heater protection control method and device, the method is applied to an MCU assembly of a thick film heater protection control system, and the thick film heater protection control system comprises a driving circuit, an IGBT assembly and a thick film heater; the MCU assembly is in communication connection with the driving circuit; the driving circuit is further in communication connection with the IGBT assembly, and the IGBT assembly is further in communication connection with the thick film heater. According to the embodiment of the invention, a driving signal is sent to a driving circuit in response to a heating starting instruction; based on the driving signal, the IGBT assembly is controlled by the driving circuit to start the thick film heater; in the operation process of the thick film heater, detecting the thick film heater based on the anti-dry-burning protection strategy to obtain a detection result; and the driving circuit and the IGBT assembly are controlled by using a detection result to protect the thick film heater, so that the use safety is improved.

Description

Technical Field

[0001] The invention relates to the field of heating control, and in particular to a thick film heater protection control method and device. Background Art

[0002] At present, thick film heaters can be used in the field of new energy vehicles to provide heat for new energy vehicles to ensure driving comfort. However, during the operation of thick film heaters, abnormal conditions such as passage blockage may occur, and the existing thick film heater control method cannot protect the thick film heater, resulting in low safety in use. Summary of the invention

[0003] The embodiments of the present invention provide a thick film heater protection control method and device, aiming to solve the problem that the thick film heater control method in the prior art cannot protect the thick film heater, resulting in low safety in use.

[0004] In a first aspect, an embodiment of the present invention provides a thick film heater protection control method, the method is applied to an MCU component of a thick film heater protection control system, the thick film heater protection control system includes a drive circuit, an IGBT component and a thick film heater, the MCU component is communicatively connected to the drive circuit; the drive circuit is also communicatively connected to the IGBT component, and the IGBT component is also communicatively connected to the thick film heater; the method includes: In response to a heating start instruction, sending a driving signal to the driving circuit; Based on the driving signal, the driving circuit controls the IGBT component to turn on the thick film heater; During the operation of the thick film heater, the thick film heater is tested based on an anti-dry burning protection strategy to obtain a test result; The detection result is used to control the drive circuit and the IGBT component to protect the thick film heater.

[0005] In a second aspect, an embodiment of the present invention further provides a thick film heater protection control device, the device is configured in an MCU component of a thick film heater protection control system, the thick film heater protection control system includes a drive circuit, an IGBT component and a thick film heater, the MCU component is communicatively connected to the drive circuit; the drive circuit is also communicatively connected to the IGBT component, and the IGBT component is also communicatively connected to the thick film heater; the device includes: a sending unit, configured to send a driving signal to the driving circuit in response to a heating start instruction; a start unit, configured to control the IGBT component by the drive circuit based on the drive signal to turn on the thick film heater; A detection unit, used for detecting the thick film heater to obtain a detection result based on an anti-dry burning protection strategy during the operation of the thick film heater; A protection unit is used to control the drive circuit and the IGBT component to protect the thick film heater by using the detection result.

[0006] The present invention provides a thick film heater protection control method and device, the method is applied to the MCU component of the thick film heater protection control system, the thick film heater protection control system includes a drive circuit, an IGBT component and a thick film heater, the MCU component is connected to the drive circuit in communication; the drive circuit is also connected to the IGBT component in communication, and the IGBT component is also connected to the thick film heater in communication; the method includes: in response to a start heating instruction, sending a drive signal to the drive circuit; based on the drive signal, the drive circuit controls the IGBT component to turn on the thick film heater; during the operation of the thick film heater, the thick film heater is detected based on the anti-dry burning protection strategy to obtain a detection result; and the drive circuit and the IGBT component are controlled by the detection result to protect the thick film heater. Therefore, in an embodiment of the present invention, in response to a start heating instruction, a drive signal is sent to the drive circuit; based on the drive signal, the drive circuit controls the IGBT component to turn on the thick film heater; during the operation of the thick film heater, the thick film heater is detected based on the anti-dry burning protection strategy to obtain a detection result; and the drive circuit and the IGBT component are controlled by the detection result to protect the thick film heater, thereby improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0008] Figure 1 A schematic flow chart of a thick film heater protection control method provided by an embodiment of the present invention; Figure 2 A schematic block diagram of a thick film heater protection control device provided by an embodiment of the present invention; Figure 3 A schematic diagram of a scenario of a thick film heater protection control method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0009] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0010] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0011] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0012] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. The embodiment of the present invention provides a thick film heater protection control method and device. The thick film heater protection control method can be found in Figure 3 , Figure 3A schematic diagram of a scenario of a thick film heater protection control method provided by an embodiment of the present invention. The method is applied to an MCU component 11 of a thick film heater protection control system 10, wherein the thick film heater protection control system 10 includes a drive circuit 12, an IGBT (Insulate-Gate Bipolar Transistor) component 13 and a thick film heater 14, wherein the MCU component 11 is in communication connection with the drive circuit 12; the drive circuit 12 is in communication connection with the IGBT component 13, and the IGBT component 13 is also in communication connection with the thick film heater 14; the thick film heater protection control system 10 also includes a sampling amplifier circuit 15 and a high-voltage connector 16, wherein the sampling amplifier circuit 15 is in communication connection with the MCU component 11, the IGBT component 13 and the high-voltage connector 16, and the high-voltage connector 16 is also in communication connection with the IGBT component 13; wherein the thick film heater protection control system 10 is applied to new energy vehicles. The driving circuit 12 includes a first driving circuit, a second driving circuit and a third driving circuit; the IGBT component 13 includes a first IGBT component, a second IGBT component and a third IGBT component.

[0013] Specifically, the MCU component 11, the driving circuit 12, the IGBT component 13 and the sampling amplifier circuit 15 constitute the controller of the thick film heater protection control system 10; and the thick film heater 14 includes: heating branches T1 and T2, a thick film controller and a housing, etc.

[0014] Figure 1 Schematic diagram of the thick film heater protection control method provided by the embodiment of the present invention. Figure 1 As shown, the method includes the following steps S110-S140.

[0015] S110 , in response to a heating start instruction, sending a driving signal to the driving circuit.

[0016] In this embodiment, the start heating instruction can be sent from the whole vehicle end of the new energy vehicle to the MCU component, and the MCU component generates the drive signal based on the start heating instruction and sends the drive signal to the drive circuit.

[0017] The thick film heater protection control system includes an MCU component, a drive circuit, an IGBT component and a thick film heater, etc. The drive circuit is used to turn on or off the IGBT component; the IGBT component is used to turn on or off the thick film heater; the thick film heater is used to generate heat according to a target power value.

[0018] S120 , based on the driving signal, the driving circuit controls the IGBT component to turn on the thick film heater.

[0019] In this embodiment, after receiving the driving signal sent by the MCU component, the driving circuit controls the IGBT component to turn on and form a closed loop based on the driving signal to turn on the thick film heater, that is, the thick film heater starts to operate.

[0020] S130: During the operation of the thick film heater, the thick film heater is tested based on an anti-dry burning protection strategy to obtain a test result.

[0021] In this embodiment, there are two heating branches T1 and T2 in the thick film heater, and the heating branches T1 and T2 can start heating operation at the same time; during the operation of the thick film heater, the passages of the heating branches T1 and T2 may be blocked or other components of the heater may be damaged, resulting in abnormal conditions such as reduced ability to carry away heat, and the film temperature or water outlet temperature may increase, which may cause abnormal conditions such as dry burning. Therefore, it is easy to cause safety hazards and lead to low safety of use.

[0022] During the operation of the thick film heater, the anti-dry burning protection strategy can be used to detect the thick film heater to obtain the detection result, and targeted processing can be performed subsequently according to the detection result.

[0023] In one embodiment, the thick film heater protection control system further includes a sampling amplifier circuit and a high voltage connector, the sampling amplifier circuit is communicatively connected to the MCU component, the IGBT component and the high voltage connector, and the high voltage connector is also communicatively connected to the IGBT component; the thick film heater is detected based on the anti-dry burning protection strategy to obtain a detection result, including: Controlling the sampling and amplifying circuit to collect the current value generated by the thick film heater in real time; Obtaining a voltage value of the high voltage connector; Calculating the current resistance value using the current value and the voltage value; Obtaining a current thick film temperature of the thick film heater based on the current resistance value and the characteristic strategy; The current thick film temperature is compared with a preset temperature threshold range to obtain the detection result.

[0024] In this embodiment, when the MCU component receives the start heating instruction, it generates a start sampling signal to send to the sampling amplifier circuit. The sampling amplifier circuit collects the current value generated by the thick film heater in real time based on the received start sampling signal. The high-voltage connector is also connected to the battery pack of the new energy vehicle to provide power to the IGBT component, etc.

[0025] Control the sampling and amplification circuit to collect the current value generated by the thick film heater in real time; obtain the voltage value of the high voltage connector; use the current value and the voltage value to calculate the current resistance value; obtain the current thick film temperature of the thick film heater based on the current resistance value and the characteristic strategy; compare the current thick film temperature with the preset temperature threshold interval to obtain the detection result. Among them, the characteristic strategy means that each resistance value obtained by sampling corresponds to the corresponding thick film temperature, that is, the thick film temperature can be obtained through the current resistance value and the characteristic strategy.

[0026] Through the above embodiments, it can be known that the sampling and amplifying circuit is controlled to collect the current value generated by the thick film heater in real time; the voltage value of the high voltage connector is obtained; the current resistance value is calculated using the current value and the voltage value; the current thick film temperature of the thick film heater is obtained based on the current resistance value and the characteristic strategy; the current thick film temperature is compared with the preset temperature threshold interval to obtain the detection result. Therefore, the detection result is obtained through real-time collection, acquisition, calculation and comparison detection, which ensures the accuracy of the data, improves the subsequent safety of use, and can be processed in a targeted manner according to the detection result.

[0027] In one embodiment, the step of comparing the current thick film temperature with a preset temperature threshold interval to obtain the detection result includes: When the current thick film temperature is not within the preset temperature threshold range, the detection result is heating abnormality; When the current thick film temperature is within the preset temperature threshold range, the detection result indicates that the heating is normal.

[0028] In this embodiment, before comparing the current thick film temperature with the preset temperature threshold interval to obtain the detection result, it also includes: calibrating each resistance value, determining the thick film temperature of each resistance value using a characteristic strategy, and determining multiple temperature threshold intervals based on the resistance value, each thick film temperature and a preset temperature floating value.

[0029] The preset temperature threshold interval refers to one of multiple temperature threshold intervals, that is, the preset temperature threshold interval corresponding to the current thick film temperature can be obtained from multiple temperature threshold intervals through the current resistance value. Among them, the temperature floating value can be 10, 20, 30 and other values.

[0030] When the current thick film temperature is not within the preset temperature threshold range, the detection result is abnormal heating; when the current thick film temperature is within the preset temperature threshold range, the detection result is normal heating.

[0031] Through the above embodiments, it can be known that the detection result is determined by comparing the current thick film temperature with the preset temperature threshold range, thereby ensuring the accuracy of data and improving the safety of subsequent use.

[0032] Furthermore, before the thick film heater is tested based on the anti-dry burning protection strategy to obtain a test result, the method further includes: The target electric power under each supply voltage is calibrated; the linear relationship between multiple current thick film temperatures and the corresponding target electric power is calibrated by a linear interpolation algorithm to obtain a temperature power strategy.

[0033] In this embodiment, the calibration of the target electric power under each supply voltage includes: determining the target electric power under each supply voltage by controlling the duty cycle to ensure the stability of the target power value of each supply voltage during operation; wherein, the target power value is the working power to be achieved by the thick film heater; the thick film heater protection control system also includes a sampler, which is arranged at the high-voltage connector and is used to collect the supply voltage provided by the high-voltage connector as the voltage value; and the linear relationship between multiple thick film temperatures and target electric power under normal circumstances can be calibrated so that when the target electric power is abnormal, the current abnormal condition of the thick film temperature can be determined to achieve the purpose of protecting the thick film heater.

[0034] Furthermore, the detecting of the thick film heater based on the anti-dry burning protection strategy to obtain the detection result further includes: Controlling the sampling and amplifying circuit to collect the current value generated by the thick film heater in real time; Obtaining a voltage value of the high voltage connector; Calculating the current power value using the current value and the voltage value; The voltage value, the current power value and a preset power threshold interval are compared and detected to obtain the detection result.

[0035] In this embodiment, when the MCU component receives the start heating instruction, it generates a start sampling signal to send to the sampling amplifier circuit. The sampling amplifier circuit collects the current value generated by the thick film heater in real time based on the received start sampling signal. The high-voltage connector is also connected to the battery pack of the new energy vehicle to provide power to the IGBT component.

[0036] The sampling and amplifying circuit is controlled to collect the current value generated by the thick film heater in real time; the voltage value of the high-voltage connector is obtained; the current power value is calculated using the current value and the voltage value; and the voltage value and the current power value are compared with a preset power threshold interval to obtain the detection result.

[0037] In this embodiment, the step of comparing the current power value with a preset power threshold interval to obtain the detection result includes: When the current power value is not within the preset power threshold range, the detection result is abnormal heating; When the current power value is within the preset power threshold range, the detection result is that the heating is normal.

[0038] In this embodiment, before the current power value is compared with the preset power threshold interval to obtain the detection result, the method further includes: calibrating each voltage value and the corresponding power value, and determining multiple power threshold intervals according to each voltage value, the corresponding power value and the preset power floating value. Therefore, the accuracy of the data is guaranteed and the safety of subsequent use is improved.

[0039] The preset power threshold interval refers to an interval among multiple power threshold intervals, that is, the preset power threshold interval corresponding to the current power value can be obtained from multiple power threshold intervals through the voltage value. The power floating value can be a value such as 1, 2, 3, or a value such as 11%, 12%, 13% of the normal power value of the interval.

[0040] In one embodiment, the thick film heater protection control system further includes a detector, the detector being communicatively connected to the MCU component; the thick film heater is detected based on the anti-dry burning protection strategy to obtain a detection result, further including: acquiring the current outlet water temperature of the thick film heater through the detector; The current heat exchange efficiency is calculated using the current outlet water temperature and the heat exchange strategy; The current heat exchange efficiency is compared with a preset heat exchange efficiency range to obtain the detection result.

[0041] In this embodiment, the heat exchange strategy can obtain multiple heat exchange parameters, and calculate and process the current heat exchange efficiency through the multiple heat exchange parameters, the current water outlet temperature and the heat exchange formula. Among them, the multiple heat exchange parameters may include coolant composition, coolant specific heat capacity, coolant flow rate, input voltage and current, water inlet temperature and other parameters. The coolant composition may be water / ethylene glycol (50 / 50); the heat exchange formula may be P=U*I (U is the input voltage, I is the current, and P is the target power value) and Qab = m*c*△T; (m is the mass flow rate of the coolant per unit time, that is, the coolant flow rate; c is the specific heat capacity of the coolant; △T is the inlet and outlet water temperature difference, that is, the difference between the current outlet water temperature and the inlet water temperature is the inlet and outlet water temperature difference; Qab is the heat brought by the thick film heater through thermal energy), and η=Qab / P (η is the heat exchange efficiency).

[0042] Through the above embodiments, it can be known that the test results are obtained by acquiring, calculating and comparing the tests, thereby ensuring the accuracy of the data, improving the safety of subsequent use, and subsequently performing targeted processing based on the test results.

[0043] In one embodiment, the comparing the current heat exchange efficiency with a preset heat exchange efficiency range to obtain the detection result includes: When the current heat exchange efficiency is not within the preset heat exchange efficiency range, the detection result is heating abnormality; When the current heat exchange efficiency is within the preset heat exchange efficiency range, the detection result indicates that the heating is normal.

[0044] In this embodiment, before the current heat exchange efficiency is compared with the preset heat exchange efficiency interval to obtain the detection result, it also includes: setting parameter conditions, determining the heat exchange efficiency of each outlet water temperature according to the parameter conditions, and determining multiple heat exchange efficiency intervals based on the outlet water temperature, each heat exchange efficiency and the efficiency floating value. Among them, the preset heat exchange efficiency interval refers to an interval in multiple heat exchange efficiency intervals, that is, the preset heat exchange efficiency interval corresponding to the current heat exchange efficiency can be obtained from multiple heat exchange efficiency intervals through the current outlet water temperature. Among them, the efficiency floating value can be a value such as 0.1, 0.2, 0.3, etc.

[0045] Through the above embodiments, it can be known that the detection result is determined by comparing the current heat exchange efficiency with the preset heat exchange efficiency range, thereby ensuring the accuracy of data and improving the safety of subsequent use.

[0046] S140: Using the detection result, control the drive circuit and the IGBT component to protect the thick film heater.

[0047] In this embodiment, the detection result includes two results: abnormal heating and normal heating. The drive circuit and the IGBT component are controlled according to the detection result to protect the thick film heater.

[0048] In one embodiment, the IGBT component includes a first IGBT component, a second IGBT component and a third IGBT component; the drive circuit includes a first drive circuit, a second drive circuit and a third drive circuit; the first IGBT component is communicatively connected to the first drive circuit and is also communicatively connected to the first end of the thick film heater; the second IGBT component is communicatively connected to the second drive circuit, and the third IGBT component is communicatively connected to the third drive circuit; the second IGBT component and the third IGBT component are also communicatively connected to the second end of the thick film heater; the use of the detection result to control the drive circuit and the IGBT component to protect the thick film heater includes: When the detection result is abnormal heating, the first drive circuit, the second drive circuit and the third drive circuit are controlled to respectively operate the first IGBT component, the second IGBT component and the third IGBT component to turn off the thick film heater to protect the thick film heater.

[0049] In this embodiment, when the detection result is abnormal heating, the MCU component controls the first drive circuit, the second drive circuit and the third drive circuit to respectively operate the first IGBT component, the second IGBT component and the third IGBT component to turn off the thick film heater, cut off the closed loop, and no longer provide power to the thick film heater, thereby protecting the thick film heater. Specifically, when the detection result is abnormal heating, the MCU component controls the first drive circuit to disconnect the first IGBT component, the second drive circuit to disconnect the second IGBT component, and the third drive circuit to disconnect the third IGBT component, respectively, and at this time, the power supply closed loop is cut off to turn off the thick film heater. When the detection result is normal heating, the thick film heater continues to operate normally.

[0050] Through the above embodiments, it can be known that when the detection result is abnormal heating, the thick film heater is turned off by controlling the first drive circuit, the second drive circuit and the third drive circuit to operate the first IGBT component, the second IGBT component and the third IGBT component respectively, thereby protecting the thick film heater and improving safety of use.

[0051] To summarize, in an embodiment of the present invention, a driving signal is sent to the driving circuit in response to a start heating instruction, and based on the driving signal, the driving circuit controls the IGBT component to turn on the thick film heater; and during the operation of the thick film heater, the thick film heater is detected based on an anti-dry burning protection strategy to obtain a detection result; the detection result is used to control the driving circuit and the IGBT component to protect the thick film heater, thereby achieving protection of the thick film heater and improving safety of use.

[0052] Figure 2 A schematic block diagram of a thick film heater protection control device provided by an embodiment of the present invention. Figure 2 As shown, corresponding to the above thick film heater protection control method, the present invention also provides a thick film heater protection control device, the device is configured in the MCU component of the thick film heater protection control system, the thick film heater protection control system includes a drive circuit, an IGBT component and a thick film heater, the MCU component is connected to the drive circuit for communication; the drive circuit is also connected to the IGBT component for communication, and the IGBT component is also connected to the thick film heater for communication. Specifically, please refer to Figure 2 , the thick film heater protection control device 700 comprises: A sending unit 701, configured to send a driving signal to the driving circuit in response to a heating start instruction; A start unit 702, configured to control the IGBT component by the drive circuit based on the drive signal to turn on the thick film heater; A detection unit 703, used for detecting the thick film heater based on an anti-dry burning protection strategy to obtain a detection result during the operation of the thick film heater; The protection unit 704 is used to control the driving circuit and the IGBT component to protect the thick film heater by using the detection result.

[0053] In some embodiments, the thick film heater protection control system further includes a sampling amplifier circuit and a high voltage connector, the sampling amplifier circuit is communicatively connected to the MCU component, the IGBT component and the high voltage connector, and the high voltage connector is also communicatively connected to the IGBT component; when the detection unit 703 performs the step of detecting the thick film heater based on the anti-dry burning protection strategy to obtain the detection result, it is specifically used to: Controlling the sampling and amplifying circuit to collect the current value generated by the thick film heater in real time; Obtaining a voltage value of the high voltage connector; Calculating the current resistance value using the current value and the voltage value; Obtaining a current thick film temperature of the thick film heater based on the current resistance value and the characteristic strategy; The current thick film temperature is compared with a preset temperature threshold range to obtain the detection result.

[0054] In some embodiments, when performing the step of comparing the current thick film temperature with a preset temperature threshold interval to obtain the detection result, it is specifically used to: When the current thick film temperature is not within the preset temperature threshold range, the detection result is heating abnormality; When the current thick film temperature is within the preset temperature threshold range, the detection result indicates that the heating is normal.

[0055] In some embodiments, when the detection unit 703 performs the step of detecting the thick film heater based on the anti-dry burning protection strategy to obtain the detection result, it is specifically used to: acquiring the current outlet water temperature of the thick film heater through the detector; The current heat exchange efficiency is calculated using the current outlet water temperature and the heat exchange strategy; The current heat exchange efficiency is compared with a preset heat exchange efficiency range to obtain the detection result.

[0056] In some embodiments, when performing the step of comparing the current heat exchange efficiency with the preset heat exchange efficiency interval to obtain the detection result, it is specifically used to: When the current heat exchange efficiency is not within the preset heat exchange efficiency range, the detection result is heating abnormality; When the current heat exchange efficiency is within the preset heat exchange efficiency range, the detection result indicates that the heating is normal.

[0057] In some embodiments, the IGBT component includes a first IGBT component, a second IGBT component and a third IGBT component; the drive circuit includes a first drive circuit, a second drive circuit and a third drive circuit; the first IGBT component is communicatively connected to the first drive circuit and is also communicatively connected to the first end of the thick film heater; the second IGBT component is communicatively connected to the second drive circuit, and the third IGBT component is communicatively connected to the third drive circuit; the second IGBT component and the third IGBT component are also communicatively connected to the second end of the thick film heater; when the protection unit 704 executes the step of controlling the drive circuit and the IGBT component to protect the thick film heater using the detection result, it is specifically used to: When the detection result is abnormal heating, the first drive circuit, the second drive circuit and the third drive circuit are controlled to respectively operate the first IGBT component, the second IGBT component and the third IGBT component to turn off the thick film heater to protect the thick film heater.

[0058] It should be noted that technicians in the relevant field can clearly understand that the specific implementation process of the above-mentioned thick film heater protection control device and each unit can refer to the corresponding description in the aforementioned method embodiment, and for the convenience and brevity of description, it will not be repeated here.

[0059] In the several embodiments provided by the present invention, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each unit is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0060] The steps in the method of the embodiment of the present invention can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0061] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A thick film heater protection control method, characterized in that: The method is applied to an MCU component of a thick film heater protection control system, the thick film heater protection control system includes a drive circuit, an IGBT component and a thick film heater, the MCU component is communicatively connected to the drive circuit; the drive circuit is also communicatively connected to the IGBT component, and the IGBT component is also communicatively connected to the thick film heater; the method includes: In response to a heating start instruction, sending a driving signal to the driving circuit; Based on the driving signal, the driving circuit controls the IGBT component to turn on the thick film heater; During the operation of the thick film heater, the thick film heater is tested based on an anti-dry burning protection strategy to obtain a test result; The detection result is used to control the drive circuit and the IGBT component to protect the thick film heater.

2. The thick film heater protection control method according to claim 1, characterized in that: The thick film heater protection control system further comprises a sampling amplifier circuit and a high voltage connector, wherein the sampling amplifier circuit is in communication connection with the MCU component, the IGBT component and the high voltage connector, and the high voltage connector is also in communication connection with the IGBT component; The detecting result obtained by detecting the thick film heater based on the anti-dry burning protection strategy includes: Controlling the sampling and amplifying circuit to collect the current value generated by the thick film heater in real time; Obtaining a voltage value of the high voltage connector; Calculating the current resistance value using the current value and the voltage value; Obtaining a current thick film temperature of the thick film heater based on the current resistance value and the characteristic strategy; The current thick film temperature is compared with a preset temperature threshold range to obtain the detection result.

3. The thick film heater protection control method according to claim 2, characterized in that: The step of comparing the current thick film temperature with a preset temperature threshold interval to obtain the detection result includes: When the current thick film temperature is not within the preset temperature threshold range, the detection result is heating abnormality; When the current thick film temperature is within the preset temperature threshold range, the detection result indicates that the heating is normal.

4. The thick film heater protection control method according to claim 1, characterized in that: The thick film heater protection control system further comprises a detector, the detector being communicatively connected with the MCU component; The detecting of the thick film heater based on the anti-dry burning protection strategy to obtain the detection result also includes: acquiring the current outlet water temperature of the thick film heater through the detector; The current heat exchange efficiency is calculated using the current outlet water temperature and the heat exchange strategy; The current heat exchange efficiency is compared with a preset heat exchange efficiency range to obtain the detection result.

5. The thick film heater protection control method according to claim 4, characterized in that: The comparing the current heat exchange efficiency with a preset heat exchange efficiency range to obtain the detection result includes: When the current heat exchange efficiency is not within the preset heat exchange efficiency range, the detection result is heating abnormality; When the current heat exchange efficiency is within the preset heat exchange efficiency range, the detection result indicates that the heating is normal.

6. The thick film heater protection control method according to claim 1, characterized in that: The IGBT component includes a first IGBT component, a second IGBT component and a third IGBT component; the drive circuit includes a first drive circuit, a second drive circuit and a third drive circuit; the first IGBT component is communicatively connected to the first drive circuit and is also communicatively connected to the first end of the thick film heater; the second IGBT component is communicatively connected to the second drive circuit, and the third IGBT component is communicatively connected to the third drive circuit; the second IGBT component and the third IGBT component are also communicatively connected to the second end of the thick film heater; the use of the detection result to control the drive circuit and the IGBT component to protect the thick film heater includes: When the detection result is abnormal heating, the first drive circuit, the second drive circuit and the third drive circuit are controlled to respectively operate the first IGBT component, the second IGBT component and the third IGBT component to turn off the thick film heater to protect the thick film heater.

7. A thick film heater protection control device, characterized in that: The device is configured in an MCU component of a thick film heater protection control system, the thick film heater protection control system includes a drive circuit, an IGBT component and a thick film heater, the MCU component is communicatively connected to the drive circuit; the drive circuit is also communicatively connected to the IGBT component, and the IGBT component is also communicatively connected to the thick film heater; the device includes: a sending unit, configured to send a driving signal to the driving circuit in response to a heating start instruction; a start unit, configured to control the IGBT component by the drive circuit based on the drive signal to turn on the thick film heater; A detection unit, used for detecting the thick film heater to obtain a detection result based on an anti-dry burning protection strategy during the operation of the thick film heater; A protection unit is used to control the drive circuit and the IGBT component to protect the thick film heater by using the detection result.

8. The thick film heater protection control device according to claim 7, characterized in that: The thick film heater protection control system further comprises a sampling amplifier circuit and a high voltage connector, wherein the sampling amplifier circuit is in communication connection with the MCU component, the IGBT component and the high voltage connector, and the high voltage connector is also in communication connection with the IGBT component; The detecting result obtained by detecting the thick film heater based on the anti-dry burning protection strategy includes: Controlling the sampling and amplifying circuit to collect the current value generated by the thick film heater in real time; Obtaining a voltage value of the high voltage connector; Calculating the current resistance value using the current value and the voltage value; Obtaining a current thick film temperature of the thick film heater based on the current resistance value and the characteristic strategy; The current thick film temperature is compared with a preset temperature threshold range to obtain the detection result.

9. The thick film heater protection control device according to claim 7, characterized in that: The thick film heater protection control system further comprises a detector, the detector being communicatively connected with the MCU component; The detecting of the thick film heater based on the anti-dry burning protection strategy to obtain the detection result also includes: acquiring the current outlet water temperature of the thick film heater through the detector; The current heat exchange efficiency is calculated using the current outlet water temperature and the heat exchange strategy; The current heat exchange efficiency is compared with a preset heat exchange efficiency range to obtain the detection result.

10. The thick film heater protection control device according to claim 7, characterized in that: The IGBT component includes a first IGBT component, a second IGBT component and a third IGBT component; the drive circuit includes a first drive circuit, a second drive circuit and a third drive circuit; the first IGBT component is communicatively connected to the first drive circuit and is also communicatively connected to the first end of the thick film heater; the second IGBT component is communicatively connected to the second drive circuit, and the third IGBT component is communicatively connected to the third drive circuit; the second IGBT component and the third IGBT component are also communicatively connected to the second end of the thick film heater; the use of the detection result to control the drive circuit and the IGBT component to protect the thick film heater includes: When the detection result is abnormal heating, the first drive circuit, the second drive circuit and the third drive circuit are controlled to respectively operate the first IGBT component, the second IGBT component and the third IGBT component to turn off the thick film heater to protect the thick film heater.

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