Positive temperature coefficient (PTC) heater output power closed-loop control method and device

Abstract

The invention provides a PTC heater output power closed-loop control method and device, the method is applied to an MCU assembly of a PTC heater output power closed-loop control system, and the PTC heater output power closed-loop control system comprises a driving chip, an IGBT assembly, a PTC heater and a sampling circuit. According to the embodiment of the invention, when the updated power difference value is greater than the second preset power value, the power difference value is updated; and performing preset processing based on the updated power difference value and a closed-loop control algorithm to obtain a first duty ratio adjustment parameter, controlling the IGBT assembly to start the PTC heater according to the first duty ratio adjustment parameter by the driving chip so as to adjust the output power value of the PTC heater in real time, and returning to execute acquisition of a plurality of sampling values acquired by the sampling circuit. And performing preset calculation processing on the plurality of sampling values to obtain a sampling power value until the sampling power value reaches a target power value, thereby realizing a power closed loop and ensuring the stability of an output power value.

Description

Technical Field

[0001] The present invention relates to the field of power control, and in particular to a method and device for closed-loop control of output power of a PTC heater. Background Art

[0002] With the continuous advancement of new energy electric vehicle technology, electric vehicles have been widely used in private households, commercial transportation, public transportation and other fields. However, during the use of electric vehicles, the heating capacity needs to consume electrical energy converted into heat to provide, and the realization of heating capacity has low output power stability due to fluctuations in temperature, voltage and current.

[0003] Therefore, the existing output power control method has the problem of low stability. Summary of the invention

[0004] The embodiment of the present invention provides a closed-loop control method and device for output power of a PTC heater, aiming to solve the problem of low stability in the existing output power control method.

[0005] In a first aspect, an embodiment of the present invention provides a closed-loop control method for the output power of a PTC heater, the method being applied to an MCU component of a closed-loop control system for the output power of a PTC heater, the PTC heater output power closed-loop control system comprising a driver chip, an IGBT component, a PTC heater and a sampling circuit, the MCU component being communicatively connected to the driver chip and the sampling circuit; the driver chip is also communicatively connected to the IGBT component, the IGBT component is also communicatively connected to the PTC heater, and the sampling circuit is also electrically connected to the PTC heater; the method comprising: Acquire multiple sampling values ​​collected by the sampling circuit, and perform preset calculation processing on the multiple sampling values ​​to obtain sampling power values; Performing a difference calculation process using the target power value and the sampled power value to obtain a power difference value; When the power difference is less than a first preset power value, a stop heating instruction is sent to the driver chip, and the driver chip controls the IGBT component to turn off the PTC heater based on the stop heating instruction; After turning off the PTC heater, continue to obtain multiple sampling values ​​collected by the sampling circuit to update the power difference value until the updated power difference value is greater than the second preset power value, and perform preset processing based on the updated power difference value and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter; By using the first duty cycle adjustment parameter, the driver chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and returns to execute the step of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

[0006] In a second aspect, an embodiment of the present invention further provides a PTC heater output power closed-loop control device, the device is configured in an MCU component of a PTC heater output power closed-loop control system, the PTC heater output power closed-loop control system includes a driver chip, an IGBT component, a PTC heater and a sampling circuit, the MCU component is communicatively connected to the driver chip and the sampling circuit; the driver chip is also communicatively connected to the IGBT component, the IGBT component is also communicatively connected to the PTC heater, and the sampling circuit is also electrically connected to the PTC heater; the device includes: A first calculation unit, configured to obtain a plurality of sampling values ​​collected by the sampling circuit, and perform a preset calculation process on the plurality of sampling values ​​to obtain a sampling power value; A second calculation unit, configured to perform a difference calculation process using the target power value and the sampled power value to obtain a power difference value; A shut-down unit, configured to send a stop heating instruction to the driver chip when the power difference is less than a first preset power value, and the driver chip controls the IGBT component to shut down the PTC heater based on the stop heating instruction; a processing unit, configured to, after turning off the PTC heater, continue to acquire a plurality of sampling values ​​collected by the sampling circuit to update the power difference value, until the updated power difference value is greater than a second preset power value, and perform preset processing based on the updated power difference value and a closed-loop control algorithm to obtain a first duty cycle adjustment parameter; The regulating unit is used to use the first duty cycle regulating parameter to control the IGBT component by the driving chip to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and return to execute the steps of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

[0007] In a third aspect, an embodiment of the present invention further provides an electronic device, which includes a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the method described in the first aspect is implemented.

[0008] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the storage medium stores a computer program, wherein the computer program includes program instructions, and wherein the program instructions, when executed by a processor, can implement the method described in the first aspect above.

[0009] The present invention provides a method and device for closed-loop control of the output power of a PTC heater. The method is applied to an MCU component of a closed-loop control system of the output power of a PTC heater. The closed-loop control system of the output power of a PTC heater includes a driver chip, an IGBT component, a PTC heater and a sampling circuit. The MCU components are all communicatively connected to the driver chip and the sampling circuit; the driver chip is also communicatively connected to the IGBT component, the IGBT component is also communicatively connected to the PTC heater, and the sampling circuit is also electrically connected to the PTC heater; the method includes: obtaining multiple sampling values ​​collected by the sampling circuit, and performing preset calculation processing on the multiple sampling values ​​to obtain sampled power values; performing difference calculation processing using a target power value and the sampled power value to obtain a power difference; when the power difference is less than a first preset power value When the PTC heater is turned off, the driver chip sends a stop heating instruction to the driver chip, and the driver chip controls the IGBT component to turn off the PTC heater based on the stop heating instruction; after turning off the PTC heater, continue to obtain multiple sampling values ​​collected by the sampling circuit to update the power difference, until the updated power difference is greater than the second preset power value, and perform preset processing based on the updated power difference and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter; using the first duty cycle adjustment parameter, the driver chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and returns to execute the steps of obtaining multiple sampling values ​​collected by the sampling circuit, and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop. In an embodiment of the present invention, when the updated power difference is greater than the second preset power value, a preset processing is performed based on the updated power difference and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter, and the driver chip controls the IGBT component to turn on the PTC heater according to the first duty cycle adjustment parameter to adjust the output power value of the PTC heater in real time, and returns to execute the steps of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop and ensuring the stability of the output power value. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] 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.

[0011] Figure 1 A schematic diagram of a flow chart of a closed-loop control method for output power of a PTC heater provided in an embodiment of the present invention; Figure 2 A schematic block diagram of a PTC heater output power closed-loop control device provided in an embodiment of the present invention; Figure 3 A schematic block diagram of an electronic device provided by an embodiment of the present invention; Figure 4 A schematic diagram of a scenario of a closed-loop control method for output power of a PTC heater provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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 PTC heater output power closed-loop control method and device. The PTC heater output power closed-loop control method can be found in Figure 4 , Figure 4A schematic diagram of a scenario of a closed-loop control method for output power of a PTC heater provided in an embodiment of the present invention. The method is applied to an MCU component 11 of a PTC heater output power closed-loop control system 10, wherein the PTC heater output power closed-loop control system 10 comprises a driver chip 12, an IGBT (Insulate-Gate Bipolar Transistor) component 13, a PTC (Positive Temperature Coefficient, generally referring to semiconductor materials or components with a large positive temperature coefficient) heater 14 and a sampling circuit 15, wherein the driver chip 12, the IGBT component 13, the PTC heater 14 and the sampling circuit 15 are all functional modules configured in the PTC heater output power closed-loop control system 10 for output power processing; the MCU component 11 is in communication connection with the driver chip 12 and the sampling circuit 15; the driver chip 12 is in communication connection with the IGBT component 13, the IGBT component 13 is in communication connection with the PTC heater 14, and the sampling circuit 15 is electrically connected with the PTC heater 14; wherein the PTC heater output power closed-loop control system 10 is applied to new energy vehicles.

[0016] Specifically, the MCU component 11, the driving chip 12, the IGBT component 13 and the sampling circuit 15 constitute the controller of the PTC heater output power closed-loop control system 10; and the PTC heater 14 includes: a PTC heating core, a PTC controller and a shell.

[0017] Figure 1 The following is a flow chart of a closed-loop control method for output power of a PTC heater provided in an embodiment of the present invention. Figure 1 As shown, the method includes the following steps S110-S150.

[0018] S110, acquiring a plurality of sampling values ​​collected by the sampling circuit, and performing a preset calculation process on the plurality of sampling values ​​to obtain a sampling power value.

[0019] In this embodiment, the multiple sampled values ​​collected are acquired from the sampling circuit, and the multiple sampled values ​​are subjected to a preset calculation process to obtain the sampled power value.

[0020] In one embodiment, before acquiring the multiple sampling values ​​collected by the sampling circuit, the method further includes: sending a start sampling instruction to the sampling circuit based on the received target start heating instruction, and determining the target power value based on the target start heating instruction; The sampling circuit is controlled to perform a plurality of sampling processes on the PTC heater based on the start sampling instruction to obtain the plurality of sampling values.

[0021] In this embodiment, after the MCU component receives the target start heating instruction sent by the new energy vehicle, it sends the start sampling instruction to the sampling circuit, and obtains the target power value based on the target start heating instruction; wherein, the target start heating instruction is the received start heating instruction, that is, the instruction generated by turning on the heating function, and the heating function can provide a hot air function for the interior of the new energy vehicle cockpit or a heating function for the battery pack of the new energy vehicle to increase the temperature of the heat function; the target power value is the power value of the heat required by the new energy vehicle.

[0022] The PTC heater output power closed-loop control system includes an MCU component, a driver chip, an IGBT component, a PTC heater and a sampling circuit, etc. The driver chip is used to turn on or off the IGBT component; the IGBT component is used to turn on or off the PTC heater; the PTC heater is used to generate heat according to the output power value; the sampling circuit is used to collect the voltage value and current value of the PTC heater.

[0023] In one embodiment, the step of performing a preset calculation on the plurality of sample values ​​to obtain a sample power value includes: Performing mean processing on a plurality of voltage sampling values ​​among the plurality of sampling values ​​to obtain an average voltage sampling value, and performing mean processing on a plurality of current sampling values ​​among the plurality of sampling values ​​to obtain an average current sampling value; The average voltage sampling value and the average current sampling value are calculated and processed to obtain the sampled power value.

[0024] In this embodiment, the multiple sampling values ​​include multiple voltage sampling values ​​and multiple current sampling values. The MCU component performs average value calculation processing on the multiple voltage sampling values ​​using the number of the multiple voltage sampling values ​​to obtain the average voltage sampling value, and performs average value calculation processing on the multiple current sampling values ​​using the number of the multiple current sampling values ​​to obtain the average current sampling value; the average voltage sampling value and the average current sampling value are multiplied to obtain the sampled power value. Therefore, the multiple voltage sampling values ​​and the multiple current sampling values ​​are averaged to obtain the corresponding average voltage sampling values ​​and the average current sampling values, and the average voltage sampling values ​​and the average current sampling values ​​are multiplied to obtain the sampled power value, which improves the accuracy of the data and thus improves the stability.

[0025] S120: Perform a difference calculation process using the target power value and the sampled power value to obtain a power difference value.

[0026] In this embodiment, when the target power value is greater than the sampled power value or the target power value is less than the sampled power value, the MCU component uses the target power value and the sampled power value to perform difference calculation to obtain the power difference, that is, the difference between the target power value and the sampled power value is used as the power difference. In this way, the power difference may be a positive value or a negative value.

[0027] When the target power value is equal to the sampled power value, that is, when the power difference is equal to zero, it means that the difference between the target power value and the sampled power value is zero, and no heating treatment is required. Therefore, a stop heating instruction is sent to the driver chip, and the driver chip controls the IGBT component based on the stop heating instruction to turn off the PTC heater.

[0028] In one embodiment, after performing a difference calculation process using the target power value and the sampled power value to obtain a power difference value, the method further includes: When the power difference is greater than or equal to the first preset power value, a second duty cycle adjustment parameter is obtained by performing preset processing based on the power difference and the closed-loop control algorithm; The second duty cycle adjustment parameter is utilized, and the driving chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time.

[0029] In this embodiment, performing preset processing based on the power difference and the closed-loop control algorithm to obtain the second duty cycle adjustment parameter includes: when the power difference is within the preset interval of the closed-loop control algorithm, adding the preset interval parameter corresponding to the preset interval to the initial duty cycle adjustment parameter to obtain the second duty cycle adjustment parameter. The step of performing preset processing based on the power difference and the closed-loop control algorithm to obtain the second duty cycle adjustment parameter can refer to the specific step of performing preset processing based on the updated power difference and the closed-loop control algorithm to obtain the first duty cycle adjustment parameter, which will not be repeated here.

[0030] When the power difference is greater than or equal to the first preset power value, a second duty cycle adjustment parameter is obtained by performing preset processing based on the power difference and the closed-loop control algorithm; using the second duty cycle adjustment parameter, the driver chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time; after the above steps; and returning to execute the step S110 of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

[0031] Therefore, when the power difference is greater than or equal to the first preset power value, the second duty cycle adjustment parameter is obtained by directly performing preset processing based on the power difference and the closed-loop control algorithm; using the second duty cycle adjustment parameter, the driver chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and returns to execute the S110 step of obtaining the multiple sampling values ​​collected by the sampling circuit, and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, and the sampling power value gradually approaches the target power value until the sampling power value reaches the target power value, thereby realizing a power closed loop to ensure the stability of the output power value.

[0032] S130: When the power difference is less than a first preset power value, a stop heating instruction is sent to the driver chip, and the driver chip controls the IGBT component to turn off the PTC heater based on the stop heating instruction.

[0033] In this embodiment, when the power difference is less than the first preset power value, it indicates that the difference between the target power value and the sampled power value is small and no heating process is required. Therefore, a stop heating instruction is sent to the driver chip, and the driver chip controls the IGBT component based on the stop heating instruction to turn off the PTC heater.

[0034] S140. After turning off the PTC heater, continue to obtain multiple sampling values ​​collected by the sampling circuit to update the power difference until the updated power difference is greater than the second preset power value, and perform preset processing based on the updated power difference and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter.

[0035] In this embodiment, after the PTC heater is turned off, multiple sampling values ​​collected by the sampling circuit are continuously acquired and the multiple sampling values ​​are subjected to preset calculation processing to obtain a sampled power value, and the target power value and the sampled power value are used to perform difference calculation processing to update the power difference value, until the updated power difference value is greater than the second preset power value, and the first duty cycle adjustment parameter is obtained by performing preset processing based on the updated power difference value and the closed-loop control algorithm. Wherein, the second preset power value is not equal to the first preset power value, and the second preset power value is greater than the first preset power value.

[0036] In one embodiment, the first duty cycle adjustment parameter is obtained by performing preset processing based on the updated power difference and the closed-loop control algorithm, including: When the updated power difference value is within the preset interval of the closed-loop control algorithm, the first duty cycle adjustment parameter is obtained by adding a preset interval parameter corresponding to the preset interval to an initial duty cycle adjustment parameter.

[0037] In this embodiment, the closed-loop control algorithm includes a preset interval and a corresponding preset interval parameter, and the preset interval and the corresponding preset interval parameter can be set according to specific circumstances. The initial duty cycle adjustment parameter is the initial preset duty cycle adjustment parameter or the duty cycle adjustment parameter in the previous cycle.

[0038] Specifically, the closed-loop control algorithm includes multiple preset intervals and corresponding multiple preset interval parameters, that is, the number of the preset intervals is multiple, and the number of the preset interval parameters is multiple; the preset intervals correspond to the preset interval parameters one by one; the number of the preset intervals is equal to the number of the preset interval parameters. For example, the number of the preset intervals is 5, which may include (-∞, -199), [-199, -20], [-19, 20], [21, 200], and (200, +∞) intervals; then the number of the preset interval parameters is 5, which may include -1%, -0.5%, 0, 0.1%, and 5% interval parameters.

[0039] Therefore, when the updated power difference is within the preset interval of the closed-loop control algorithm, the MCU component uses the preset interval parameter corresponding to the preset interval as the first duty cycle adjustment parameter. In this way, the first duty cycle adjustment parameter can be accurately obtained by preset processing based on the power difference and the closed-loop control algorithm, thereby improving data accuracy and thus stability.

[0040] S150. Using the first duty cycle adjustment parameter, the driver chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and returns to execute the step of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

[0041] In this embodiment, within the corresponding period, the first duty cycle adjustment parameter is utilized to control the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and return to execute the step of acquiring multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, that is, the power difference is equal to zero, thereby realizing a power closed loop.

[0042] After the first duty cycle adjustment parameter is used to control the IGBT component to turn on or off the PTC heater by the driver chip to adjust the output power value of the PTC heater in real time, the step S110 of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value is returned to execute until the sampling power value reaches the target power value, thereby realizing a power closed loop and ensuring the stability of the output power value.

[0043] To summarize, the embodiment of the present invention can utilize that when the updated power difference value is greater than the second preset power value, a preset processing is performed based on the updated power difference value and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter, and the driving chip controls the IGBT component to turn on the PTC heater according to the first duty cycle adjustment parameter to adjust the output power value of the PTC heater in real time, thereby realizing real-time adjustment processing of the PTC heater and ensuring the stability of the output power value.

[0044] Figure 2 A schematic block diagram of a closed-loop control device for output power of a PTC heater provided in an embodiment of the present invention. Figure 2 As shown, corresponding to the above PTC heater output power closed-loop control method, the present invention also provides a PTC heater output power closed-loop control device, the device is configured in the MCU component of the PTC heater output power closed-loop control system, the PTC heater output power closed-loop control system includes a driving chip, an IGBT component, a PTC heater and a sampling circuit, the MCU component is connected to the driving chip and the sampling circuit for communication; the driving chip is also connected to the IGBT component for communication, the IGBT component is also connected to the PTC heater for communication, and the sampling circuit is also electrically connected to the PTC heater. Specifically, please refer to Figure 2 The PTC heater output power closed-loop control device 700 comprises: A first calculation unit 701 is used to obtain a plurality of sampling values ​​collected by the sampling circuit, and perform a preset calculation process on the plurality of sampling values ​​to obtain a sampling power value; A second calculation unit 702 is used to perform a difference calculation process using the target power value and the sampled power value to obtain a power difference value; A shut-down unit 703, configured to send a stop heating instruction to the driver chip when the power difference is less than a first preset power value, and the driver chip controls the IGBT component to shut down the PTC heater based on the stop heating instruction; The processing unit 704 is used to, after turning off the PTC heater, continue to obtain multiple sampling values ​​collected by the sampling circuit to update the power difference value until the updated power difference value is greater than the second preset power value, and perform preset processing based on the updated power difference value and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter; The adjustment unit 705 is used to use the first duty cycle adjustment parameter to control the IGBT component by the driving chip to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and return to execute the step of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

[0045] In some embodiments, after executing the step of performing a difference calculation process on the target power value and the sampled power value to obtain a power difference, the second calculation unit 702 is further specifically configured to: When the power difference is greater than or equal to the first preset power value, a second duty cycle adjustment parameter is obtained by performing preset processing based on the power difference and the closed-loop control algorithm; The second duty cycle adjustment parameter is utilized, and the driving chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time.

[0046] In some embodiments, when executing the step of performing preset processing based on the updated power difference and the closed-loop control algorithm to obtain the first duty cycle adjustment parameter, the processing unit 704 is specifically used to: When the updated power difference value is within the preset interval of the closed-loop control algorithm, the first duty cycle adjustment parameter is obtained by adding a preset interval parameter corresponding to the preset interval to an initial duty cycle adjustment parameter.

[0047] In some embodiments, when executing the step of performing a preset calculation process on the plurality of sample values ​​to obtain a sample power value, the first calculation unit 701 is specifically configured to: Performing mean processing on a plurality of voltage sampling values ​​among the plurality of sampling values ​​to obtain an average voltage sampling value, and performing mean processing on a plurality of current sampling values ​​among the plurality of sampling values ​​to obtain an average current sampling value; The average voltage sampling value and the average current sampling value are calculated and processed to obtain the sampled power value.

[0048] In some embodiments, before executing the step of obtaining the multiple sampling values ​​collected by the sampling circuit, the first calculating unit 701 is further specifically configured to: sending a start sampling instruction to the sampling circuit based on the received target start heating instruction, and determining the target power value based on the target start heating instruction; The sampling circuit is controlled to perform a plurality of sampling processes on the PTC heater based on the start sampling instruction to obtain the plurality of sampling values.

[0049] It should be noted that technicians in the relevant field can clearly understand that the specific implementation process of the above-mentioned PTC heater output power closed-loop 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.

[0050] The above-mentioned PTC heater output power closed-loop control device can be implemented in the form of a computer program. The computer program can be used in Figure 3 Runs on the computer device shown.

[0051] See also Figure 3 , Figure 3 800 is a schematic block diagram of an electronic device provided by an embodiment of the present invention. The electronic device 800 may be a terminal or a server, wherein the terminal may be an electronic device with a communication function. The server may be an independent server or a server cluster composed of multiple servers.

[0052] See also Figure 3 The electronic device 800 includes a processor 802 , a memory and a network interface 805 connected via a system bus 801 , wherein the memory may include a non-volatile storage medium 803 and an internal memory 804 .

[0053] The non-volatile storage medium 803 can store an operating system 8031 ​​and a computer program 8032. The computer program 8032 includes program instructions, and when the program instructions are executed, the processor 802 can execute a closed-loop control method for output power of a PTC heater.

[0054] The processor 802 is used to provide computing and control capabilities to support the operation of the entire electronic device 800 .

[0055] The internal memory 804 provides an environment for the operation of the computer program 8032 in the non-volatile storage medium 803. When the computer program 8032 is executed by the processor 802, the processor 802 can execute a closed-loop control method for the output power of a PTC heater.

[0056] The network interface 805 is used to communicate with other devices over the network. Figure 3The structure shown in the figure is merely a block diagram of a partial structure related to the solution of the present invention, and does not constitute a limitation on the electronic device 800 to which the solution of the present invention is applied. The specific electronic device 800 may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0057] The processor 802 is used to run the computer program 8032 stored in the memory to implement the following steps: Acquire multiple sampling values ​​collected by the sampling circuit, and perform preset calculation processing on the multiple sampling values ​​to obtain sampling power values; The target power value and the sampled power value are used to perform a difference calculation process to obtain a power difference value; When the power difference is less than a first preset power value, a stop heating instruction is sent to the driver chip, and the driver chip controls the IGBT component to turn off the PTC heater based on the stop heating instruction; After turning off the PTC heater, continue to obtain multiple sampling values ​​collected by the sampling circuit to update the power difference value until the updated power difference value is greater than the second preset power value, and perform preset processing based on the updated power difference value and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter; By using the first duty cycle adjustment parameter, the driver chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and returns to execute the step of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

[0058] In some embodiments, after implementing the step of performing a difference calculation process on the target power value and the sampled power value to obtain a power difference, the processor 802 further specifically implements the following steps: When the power difference is greater than or equal to the first preset power value, a second duty cycle adjustment parameter is obtained by performing preset processing based on the power difference and the closed-loop control algorithm; The second duty cycle adjustment parameter is utilized, and the driving chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time.

[0059] In some embodiments, when the processor 802 implements the step of performing preset processing based on the updated power difference and the closed-loop control algorithm to obtain the first duty cycle adjustment parameter, the processor 802 specifically implements the following steps: When the updated power difference value is within the preset interval of the closed-loop control algorithm, the first duty cycle adjustment parameter is obtained by adding a preset interval parameter corresponding to the preset interval to an initial duty cycle adjustment parameter.

[0060] In some embodiments, when the processor 802 implements the step of performing a preset calculation process on the multiple sample values ​​to obtain a sample power value, the processor 802 specifically implements the following steps: Performing mean processing on a plurality of voltage sampling values ​​among the plurality of sampling values ​​to obtain an average voltage sampling value, and performing mean processing on a plurality of current sampling values ​​among the plurality of sampling values ​​to obtain an average current sampling value; The average voltage sampling value and the average current sampling value are calculated and processed to obtain the sampled power value.

[0061] In some embodiments, before implementing the step of obtaining the multiple sampling values ​​collected by the sampling circuit, the processor 802 further specifically implements the following steps: sending a start sampling instruction to the sampling circuit based on the received target start heating instruction, and determining the target power value based on the target start heating instruction; The sampling circuit is controlled to perform a plurality of sampling processes on the PTC heater based on the start sampling instruction to obtain the plurality of sampling values.

[0062] It should be understood that in the embodiment of the present invention, the processor 802 may be a central processing unit (CPU), and the processor 802 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0063] It can be understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program includes program instructions, and the computer program can be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the process steps of the embodiment of the above method.

[0064] Therefore, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the following steps: Acquire multiple sampling values ​​collected by the sampling circuit, and perform preset calculation processing on the multiple sampling values ​​to obtain sampling power values; Performing a difference calculation process using the target power value and the sampled power value to obtain a power difference value; When the power difference is less than a first preset power value, a stop heating instruction is sent to the driver chip, and the driver chip controls the IGBT component to turn off the PTC heater based on the stop heating instruction; After turning off the PTC heater, continue to obtain multiple sampling values ​​collected by the sampling circuit to update the power difference value until the updated power difference value is greater than the second preset power value, and perform preset processing based on the updated power difference value and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter; By using the first duty cycle adjustment parameter, the driver chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and returns to execute the step of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

[0065] In one embodiment, after executing the program instructions to implement the step of performing difference calculation processing using the target power value and the sampled power value to obtain a power difference, the processor further specifically implements the following steps: When the power difference is greater than or equal to the first preset power value, a second duty cycle adjustment parameter is obtained by performing preset processing based on the power difference and the closed-loop control algorithm; The second duty cycle adjustment parameter is utilized, and the driving chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time.

[0066] In one embodiment, when the processor executes the program instructions to implement the step of performing preset processing based on the updated power difference and the closed-loop control algorithm to obtain the first duty cycle adjustment parameter, the processor further specifically implements the following steps: When the updated power difference value is within the preset interval of the closed-loop control algorithm, the first duty cycle adjustment parameter is obtained by adding a preset interval parameter corresponding to the preset interval to an initial duty cycle adjustment parameter.

[0067] In one embodiment, when the processor executes the program instructions to implement the step of performing a preset calculation process on the multiple sample values ​​to obtain a sample power value, the processor specifically implements the following steps: Performing mean processing on a plurality of voltage sampling values ​​among the plurality of sampling values ​​to obtain an average voltage sampling value, and performing mean processing on a plurality of current sampling values ​​among the plurality of sampling values ​​to obtain an average current sampling value; The average voltage sampling value and the average current sampling value are calculated and processed to obtain the sampled power value.

[0068] In one embodiment, before executing the program instructions to implement the step of obtaining the multiple sampling values ​​collected by the sampling circuit, the processor further specifically implements the following steps: sending a start sampling instruction to the sampling circuit based on the received target start heating instruction, and determining the target power value based on the target start heating instruction; The sampling circuit is controlled to perform a plurality of sampling processes on the PTC heater based on the start sampling instruction to obtain the plurality of sampling values.

[0069] The storage medium may be a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which are computer-readable storage media that can store program codes.

[0070] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0071] 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.

[0072] 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.

[0073] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention.

[0074] 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 closed-loop control method for output power of a PTC heater, characterized in that: The method is applied to an MCU component of a PTC heater output power closed-loop control system, the PTC heater output power closed-loop control system comprises a driving chip, an IGBT component, a PTC heater and a sampling circuit, the MCU component is communicatively connected to the driving chip and the sampling circuit; the driving chip is also communicatively connected to the IGBT component, the IGBT component is also communicatively connected to the PTC heater, and the sampling circuit is also electrically connected to the PTC heater; the method comprises: Acquire multiple sampling values ​​collected by the sampling circuit, and perform preset calculation processing on the multiple sampling values ​​to obtain sampling power values; Performing a difference calculation process using the target power value and the sampled power value to obtain a power difference value; When the power difference is less than a first preset power value, a stop heating instruction is sent to the driver chip, and the driver chip controls the IGBT component to turn off the PTC heater based on the stop heating instruction; After turning off the PTC heater, continue to obtain multiple sampling values ​​collected by the sampling circuit to update the power difference value until the updated power difference value is greater than the second preset power value, and perform preset processing based on the updated power difference value and the closed-loop control algorithm to obtain a first duty cycle adjustment parameter; By using the first duty cycle adjustment parameter, the driver chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and returns to execute the step of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

2. The closed-loop control method for output power of a PTC heater according to claim 1, characterized in that: After the target power value and the sampled power value are used to perform difference calculation to obtain the power difference, the method further includes: When the power difference is greater than or equal to the first preset power value, a second duty cycle adjustment parameter is obtained by performing preset processing based on the power difference and the closed-loop control algorithm; The second duty cycle adjustment parameter is utilized, and the driving chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time.

3. The closed-loop control method for output power of a PTC heater according to claim 1, characterized in that: The first duty cycle adjustment parameter is obtained by performing preset processing based on the updated power difference and the closed-loop control algorithm, including: When the updated power difference value is within the preset interval of the closed-loop control algorithm, the first duty cycle adjustment parameter is obtained by adding a preset interval parameter corresponding to the preset interval to an initial duty cycle adjustment parameter.

4. The closed-loop control method for output power of a PTC heater according to claim 1, characterized in that: The step of performing a preset calculation on the plurality of sample values ​​to obtain a sample power value includes: Performing mean processing on a plurality of voltage sampling values ​​among the plurality of sampling values ​​to obtain an average voltage sampling value, and performing mean processing on a plurality of current sampling values ​​among the plurality of sampling values ​​to obtain an average current sampling value; The average voltage sampling value and the average current sampling value are calculated and processed to obtain the sampled power value.

5. The closed-loop control method for output power of a PTC heater according to claim 1, characterized in that: Before acquiring the multiple sampling values ​​collected by the sampling circuit, the method further includes: sending a start sampling instruction to the sampling circuit based on the received target start heating instruction, and determining the target power value based on the target start heating instruction; The sampling circuit is controlled to perform a plurality of sampling processes on the PTC heater based on the start sampling instruction to obtain the plurality of sampling values.

6. A PTC heater output power closed-loop control device, characterized in that: The device is configured in an MCU component of a PTC heater output power closed-loop control system, the PTC heater output power closed-loop control system includes a drive chip, an IGBT component, a PTC heater and a sampling circuit, the MCU component is connected to the drive chip and the sampling circuit for communication; the drive chip is also connected to the IGBT component for communication, the IGBT component is also connected to the PTC heater for communication, and the sampling circuit is also electrically connected to the PTC heater; the device includes: A first calculation unit, configured to obtain a plurality of sampling values ​​collected by the sampling circuit, and perform a preset calculation process on the plurality of sampling values ​​to obtain a sampling power value; A second calculation unit, configured to perform a difference calculation process using the target power value and the sampled power value to obtain a power difference value; A shut-down unit, configured to send a stop heating instruction to the driver chip when the power difference is less than a first preset power value, and the driver chip controls the IGBT component to shut down the PTC heater based on the stop heating instruction; a processing unit, configured to, after turning off the PTC heater, continue to acquire a plurality of sampling values ​​collected by the sampling circuit to update the power difference value, until the updated power difference value is greater than a second preset power value, and perform preset processing based on the updated power difference value and a closed-loop control algorithm to obtain a first duty cycle adjustment parameter; The regulating unit is used to use the first duty cycle regulating parameter to control the IGBT component by the driving chip to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time, and return to execute the steps of obtaining multiple sampling values ​​collected by the sampling circuit and performing preset calculation processing on the multiple sampling values ​​to obtain the sampling power value, until the sampling power value reaches the target power value, thereby realizing a power closed loop.

7. The PTC heater output power closed-loop control device according to claim 6, characterized in that: After the target power value and the sampled power value are used to perform difference calculation to obtain the power difference, the method further includes: When the power difference is greater than or equal to the first preset power value, a second duty cycle adjustment parameter is obtained by performing preset processing based on the power difference and the closed-loop control algorithm; The second duty cycle adjustment parameter is utilized, and the driving chip controls the IGBT component to turn on or off the PTC heater to adjust the output power value of the PTC heater in real time.

8. The PTC heater output power closed-loop control device according to claim 6, characterized in that: The first duty cycle adjustment parameter is obtained by performing preset processing based on the updated power difference and the closed-loop control algorithm, including: When the updated power difference value is within the preset interval of the closed-loop control algorithm, the first duty cycle adjustment parameter is obtained by adding a preset interval parameter corresponding to the preset interval to an initial duty cycle adjustment parameter.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the PTC heater output power closed-loop control method according to any one of claims 1 to 5 is implemented.

10. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, which includes program instructions. When the program instructions are executed by a processor, the processor executes the PTC heater output power closed-loop control method according to any one of claims 1 to 5.

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