Control circuit for driving heating by alternating current, related equipment and related control method

Abstract

The invention discloses a control circuit for driving heating by alternating current, related equipment and a related control method. The control method for driving heating by alternating current comprises the following steps: an alternating current rectifier bridge converts alternating current output by an alternating current power supply into direct current with a preset waveform and inputs the direct current into an IGBT (Insulated Gate Bipolar Translator) module; and the IGBT module inputs the direct current with the preset waveform to the connected PTC heater for corresponding heating control based on a preset on-off control strategy. According to the embodiment of the invention, the alternating current of the alternating current power supply externally connected with the control circuit driven by the alternating current for heating can be directly converted into the direct current with the preset waveform through the alternating current rectifier bridge and then input into the IGBT module, and the heating process of the PTC heater connected with the IGBT module is controlled through the IGBT module, so that the cost is low; and when the system is applied to the electric automobile, the existing alternating current power supply capacity of the whole automobile is used for supplying power to the heating process.

Description

Technical Field

[0001] The present invention relates to the technical field of PTC heating control of new energy, and in particular to a control circuit, related equipment and related control method for AC driven heating. Background Art

[0002] With the continuous development of new energy technology, new energy electric vehicles have been more and more widely used. The battery modules of new energy electric vehicles can be recharged and used repeatedly. When the battery module is low in power, it can be charged based on charging equipment (such as charging piles at charging stations or charging heads at home).

[0003] In some areas with relatively low temperatures, when charging the battery modules of new energy electric vehicles, it is generally necessary to heat them before charging to ensure the charging effect. This is because the chemical activity of the battery modules will decrease in low temperature environments. For example, if the battery module uses lithium-ion batteries, the viscosity of the electrolyte increases in low temperature environments, and the ion conduction speed slows down, resulting in an increase in the internal resistance of the lithium-ion battery. The heat generated internally during the charging process will increase and normal charging cannot be ensured. Before charging the battery modules of new energy electric vehicles in low temperature areas, the battery modules need to be heated by a heating device. The power supply device of the heating device is the battery module. As a result, after the new energy electric vehicle is connected to the charging device, the battery module first stores the charged electric energy, and then the battery module powers the heating device to heat the battery module. If the working power of the heating device is greater than the charging power of the battery module, the main electric energy of the battery module will be used to supply the heating device and cannot be fully charged. Summary of the invention

[0004] The embodiments of the present invention provide a control circuit, related equipment and related control method for AC-driven heating, aiming to solve the problem in the prior art that when a new energy electric vehicle is charging a battery module in an area with relatively low temperature, the power supply device of the heating device is the battery module, and when the working power of the heating device is greater than the charging power of the battery module, the main electric energy of the battery module is used to supply the heating device and cannot be fully charged.

[0005] In the first aspect, an embodiment of the present invention provides a control circuit for AC driven heating, comprising: an AC rectifier bridge and an IGBT module; the input end of the AC rectifier bridge is connected to an AC power source, and the output end of the AC rectifier bridge is connected to the input end of the IGBT module; the output end of the IGBT module is connected to a PTC heater as a controlled object; the AC rectifier bridge is used to convert the AC power output by the AC power source into DC power with a preset waveform and then input it into the IGBT module, so that the PTC heater connected by the on-off control of the IGBT module performs corresponding heating; wherein the voltage corresponding to the DC power with the preset waveform is a positive voltage.

[0006] In a second aspect, an embodiment of the present invention further provides a heating device, which includes the control circuit for AC-driven heating as described in the first aspect above, and also includes a PTC heater connected to the output end of the IGBT module in the control circuit for AC-driven heating.

[0007] In a third aspect, an embodiment of the present invention further provides an electric vehicle, which includes the heating device as described in the second aspect above, and the heating device is arranged in the electric vehicle and is used to heat an object to be heated in the electric vehicle.

[0008] In a fourth aspect, an embodiment of the present invention further provides a control method for AC-driven heating, which is applied to the control circuit for AC-driven heating as described in the first aspect above, and the control method for AC-driven heating includes: The AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module; wherein the voltage corresponding to the DC power with the preset waveform is a positive voltage; The IGBT module inputs the DC power with the preset waveform to the connected PTC heater to perform corresponding heating control based on the preset on-off control strategy.

[0009] In a fifth aspect, an embodiment of the present invention further provides a control method for a heating device, which is applied to the heating device as described in the second aspect above, comprising: The AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module; wherein the voltage corresponding to the DC power with the preset waveform is a positive voltage; The IGBT module inputs the DC power having the preset waveform to the connected PTC heater based on the preset on-off control strategy; The PTC heater heats the object to be heated corresponding to the heating provided by the PTC heater based on the direct current of the preset waveform and the on-off control strategy.

[0010] In a sixth aspect, an embodiment of the present invention further provides a heating control method for an electric vehicle, which is applied to the electric vehicle as described in the third aspect above, wherein the heating device in the electric vehicle is disposed in the electric vehicle; the heating control method for the electric vehicle comprises: The AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module; The IGBT module inputs the DC power having the preset waveform to the connected PTC heater based on the preset on-off control strategy; The PTC heater heats the object to be heated in the vehicle corresponding to the heating provided by the PTC heater based on the DC power of the preset waveform and the on-off control strategy; If the vehicle thermal management module detects that the current heating parameters have met the preset heating control conditions, it will generate a corresponding stop heating signal and send the stop heating signal to the IGBT module to put the IGBT module in a disconnected state.

[0011] The embodiment of the present invention provides a control circuit, related equipment and related control method for AC driven heating. The control method for AC driven heating includes: an AC rectifier bridge converts the AC power output by the AC power source into DC power with a preset waveform and then inputs it into an IGBT module; wherein the voltage corresponding to the DC power with the preset waveform is a positive voltage; the IGBT module inputs the DC power with the preset waveform into the connected PTC heater for corresponding heating control based on a preset on-off control strategy. The embodiment of the present invention can directly convert the AC power of the AC power source externally connected to the control circuit for AC driven heating into DC power with a preset waveform through an AC rectifier bridge and then input it into the IGBT module, and control the heating process of the connected PTC heater through the IGBT module, which not only has low cost, but also uses the existing AC power supply capacity of the vehicle to power the heating process when applied to electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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.

[0013] Figure 1 A schematic block diagram of a control circuit for AC-driven heating provided in an embodiment of the present invention; Figure 2 A schematic diagram of a waveform corresponding to a DC current with a preset waveform in a control circuit for AC-driven heating provided in an embodiment of the present invention; Figure 3Another schematic block diagram of a control circuit for AC-driven heating provided by an embodiment of the present invention; Figure 4 A schematic flow chart of a control method for AC-driven heating provided in an embodiment of the present invention; Figure 5 Another schematic diagram of a flow chart of a control method for AC-driven heating provided by an embodiment of the present invention; Figure 6 A schematic flow chart of a method for controlling a heating device provided in an embodiment of the present invention; Figure 7 A schematic flow chart of a heating control method for an electric vehicle provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0014] 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.

[0015] 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.

[0016] 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.

[0017] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0018] See also Figure 1 , Figure 1 A schematic block diagram of a control circuit for AC-driven heating provided by an embodiment of the present invention. Figure 1As shown, the control circuit of the AC driven heating includes an AC rectifier bridge and an IGBT module; the input end of the AC rectifier bridge 10 is connected to the AC power supply 1, and the output end of the AC rectifier bridge 10 is connected to the input end of the IGBT module 20; the output end of the IGBT module 20 is connected to the PTC heater 30 as a controlled object; the AC rectifier bridge 10 is used to convert the AC power output by the AC power supply 1 into DC power with a preset waveform and input it into the IGBT module 20, so that the PTC heater 30 connected by the on-off control of the IGBT module 20 performs corresponding heating; wherein, the voltage corresponding to the DC power with the preset waveform is a positive voltage.

[0019] In this embodiment, the control circuit for AC-driven heating can be arranged on the electric vehicle, and its power supply source is not limited to the battery module of the electric vehicle, but can also be based on an external AC power source 1 (such as an AC charging pile, etc.) to convert AC into DC power after AC rectification, and then power the PTC heater 30 connected to the control circuit for AC-driven heating to perform heating operation. For example, in a low temperature environment, the PTC heater 30 is arranged on the battery module of the electric vehicle, and the heat generated by the heating of the PTC heater 30 can heat the battery module of the electric vehicle to ensure that the battery module can be charged normally when the external charging device is connected.

[0020] The AC rectifier bridge 10 can be implemented as a single-phase AC rectifier bridge, which can convert the AC power (such as 220V AC power) provided by the AC power source 1 into a DC power with a preset waveform after single-phase AC rectification by the single-phase AC rectifier bridge, and its waveform is as shown in FIG. Figure 2 As shown, the ordinate represents the voltage of direct current, and the abscissa represents the phase angle. Direct current with a preset waveform is a positive voltage. When it is loaded on both ends of the PTC heater and is controlled on and off by the IGBT module, it can effectively control the PTC heater to generate heat and heat. Moreover, because the direct current with a preset waveform is a positive voltage, it also ensures that the voltage drop direction at both ends of the PTC heater remains unchanged, so that it can generate heat more stably. It can be seen that the control circuit for AC-driven heating used in this application has a simple circuit structure and low implementation cost. When applied to electric vehicles, it can also use the existing AC power supply capacity of the vehicle to power the heating process, that is, it only needs an external AC power supply to drive it.

[0021] Furthermore, if the electric vehicle is divided into a high-voltage domain and a low-voltage domain, the control circuit for AC-driven heating needs to be arranged in the low-voltage domain of the electric vehicle to be electrically isolated from the high-voltage domain.

[0022] In one embodiment, if Figure 3As shown, the control circuit of the AC driven heating also includes an IGBT drive circuit 40 and an isolation chip 50; the input end of the IGBT drive circuit 40 is connected to a low voltage power supply (not shown), and is also connected to the output end of the isolation chip 50, and the output end of the IGBT drive circuit 40 is connected to the input end of the IGBT module 20; the input end of the isolation chip 50 is connected to an external controller (not shown) that can output an external switching signal.

[0023] In this embodiment, the control circuit for AC-driven heating also includes an IGBT drive circuit 40 and an isolation chip 50, which can also be arranged in the low-voltage domain of the electric vehicle. In specific implementation, if an external controller (such as an MCU controller) is set in the high-voltage domain of the electric vehicle, then the external switch signal generated by the external controller is directly transmitted from the high-voltage domain to the IGBT drive circuit 40, and there may be interference signals, resulting in inaccurate control of the IGBT drive circuit 40, thereby affecting the subsequent heating process.

[0024] The isolation chip 50 used is a capacitive coupling isolation chip, an inductive coupling isolation chip, etc., which can prevent current from flowing directly between the corresponding circuit of the low-voltage domain and the corresponding circuit of the high-voltage domain of the electric vehicle, and can also realize the transmission of signals or energy. The electrical isolation function of the isolation chip improves the safety, reliability and anti-interference ability of the control circuit of the AC-driven heating.

[0025] The present application also provides a heating device, which includes the control circuit of AC-driven heating described in any of the above embodiments, and also includes a PTC heater connected to the output end of the IGBT module in the control circuit of AC-driven heating. Moreover, the heating device can be used in electric vehicles. For example, the heating device is set on the battery module in the electric vehicle. When the heating of the heating device needs to be started, it is only necessary to connect the AC rectifier bridge in the heating device to an external AC power source (such as the charging head of the home charging device of the electric vehicle, or an AC charging pile, etc.), so that the AC power output by the AC power source can be converted into DC power with a preset waveform and then input into the IGBT module in the heating device, so that the PTC heater connected by the on-off control of the IGBT module performs corresponding heating; wherein, the voltage corresponding to the DC power with the preset waveform is a positive voltage.

[0026] The direct current with a preset waveform is a positive voltage. When it is loaded at both ends of the PTC heater and is controlled on and off by the IGBT module, it can effectively control the PTC heater to generate heat and heat. Moreover, because the direct current with a preset waveform is a positive voltage, it also ensures that the voltage drop direction at both ends of the PTC heater remains unchanged, so that it can generate heat more stably. It can be seen that the control circuit for AC-driven heating used in this application has a simple circuit structure and low implementation cost. When applied to electric vehicles, it can use the existing AC power supply capacity of the vehicle to power the heating process. For example, it can be driven by an external AC power supply.

[0027] The present application also provides an electric vehicle, which includes the heating device described in any of the aforementioned embodiments, and the heating device is arranged in the electric vehicle and is used to heat the object to be heated in the electric vehicle. It should be noted that the heating device includes the control circuit for AC-driven heating described in any of the aforementioned embodiments, and also includes a PTC heater connected to the output end of the IGBT module in the control circuit for AC-driven heating. The control circuit for AC-driven heating is arranged in the low-voltage domain of the electric vehicle. In specific implementation, if an external controller (such as an MCU controller) is provided in the high-voltage domain of the electric vehicle, then the external switch signal generated by the external controller is directly transmitted from the high-voltage domain to the IGBT drive circuit in the control circuit for AC-driven heating. There may be interference signals, resulting in inaccurate control of the IGBT drive circuit, thereby affecting the subsequent heating process.

[0028] After the isolation chip is used and the input end of the isolation chip is connected to the external controller, the current can be prevented from flowing directly between the corresponding circuit in the low-voltage domain and the corresponding circuit in the high-voltage domain of the electric vehicle through the electrical isolation function of the isolation chip, thereby mainly improving the safety, reliability and anti-interference ability of the control circuit of the AC driven heating.

[0029] When it is necessary to start the heating of the heating device, it is only necessary to connect the AC rectifier bridge in the heating device to an external AC power supply (such as a charging head of a household charging device for an electric car, etc.), so that the AC power output by the AC power supply can be converted into DC power with a preset waveform and then input into the IGBT module in the heating device, so that the PTC heater connected by the on-off control of the IGBT module can perform corresponding heating; wherein, the voltage corresponding to the DC power with the preset waveform is a positive voltage.

[0030] The present application also provides a control method for AC-driven heating, which is applied to the control circuit for AC-driven heating as described in any of the above embodiments. Figure 4 As shown, the control method of AC driven heating includes the following steps S110-S120.

[0031] S110, the AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module.

[0032] Wherein, the voltage corresponding to the direct current of the preset waveform is a positive voltage.

[0033] In this embodiment, please refer to Figure 1 , the control circuit for AC-driven heating can be set on the electric vehicle, and its power supply source is not limited to the battery module of the electric vehicle, but can also be based on an external AC power source 1 (such as an AC charging pile, etc.) to convert AC into DC power after AC rectification, and then power the PTC heater 30 connected to the control circuit for AC-driven heating to perform heating operation. For example, in a low temperature environment, the PTC heater 30 is set on the battery module of the electric vehicle, and the heat generated by the heating of the PTC heater 30 can heat the battery module of the electric vehicle to ensure that the battery module can be charged normally when the external charging device is connected.

[0034] The AC rectifier bridge 10 can be implemented as a single-phase AC rectifier bridge, which can convert the AC power (such as 220V AC power) provided by the AC power source 1 into a DC power with a preset waveform after single-phase AC rectification by the single-phase AC rectifier bridge, and its waveform is as shown in FIG. Figure 2 shown.

[0035] S120: The IGBT module inputs the DC power with the preset waveform into the connected PTC heater based on the preset on-off control strategy to perform corresponding heating control.

[0036] In this embodiment, the direct current with a preset waveform is a positive voltage. When it is loaded at both ends of the PTC heater and is controlled on and off by the IGBT module, it can effectively control the PTC heater to generate heat and heat. Moreover, because the direct current with a preset waveform is a positive voltage, it also ensures that the voltage drop direction at both ends of the PTC heater remains unchanged, so that it can generate heat more stably. It can be seen that the control circuit for AC-driven heating used in this application has a simple circuit structure and low implementation cost. When applied to electric vehicles, it uses the existing AC power supply capacity of the vehicle to power the heating process, that is, it only needs an external AC power supply to drive it.

[0037] In one embodiment, the control circuit of the AC-driven heating further includes an IGBT drive circuit and an isolation chip; the input end of the IGBT drive circuit is connected to a low-voltage power supply and is also connected to the output end of the isolation chip, and the output end of the IGBT drive circuit is connected to the input end of the IGBT module; the input end of the isolation chip is connected to an external controller that can output an external switch signal; Figure 5As shown, before step S110, it also includes: S101: When the isolation chip receives an external switch signal sent by an external controller, it performs corresponding isolation processing on an interference signal in the external switch signal to obtain a processed switch signal, and sends the processed switch signal to the IGBT drive circuit; S102 : If the IGBT driving circuit receives the processed switch signal, it generates a corresponding IGBT driving signal, and sends the IGBT driving signal to the IGBT module to drive the IGBT module.

[0038] In this embodiment, if Figure 3 As shown, the control circuit for AC-driven heating also includes an IGBT drive circuit 40 and an isolation chip 50, which can also be arranged in the low-voltage domain of the electric vehicle. In specific implementation, if an external controller (such as an MCU controller) is set in the high-voltage domain of the electric vehicle, then the external switch signal generated by the external controller is directly transmitted from the high-voltage domain to the IGBT drive circuit 40, and there may be interference signals, resulting in inaccurate control of the IGBT drive circuit 40, thereby affecting the subsequent heating process.

[0039] Among them, the isolation chip 50 used is a capacitive coupling isolation chip, an inductive coupling isolation chip, etc., which can prevent the current from flowing directly between the corresponding circuit in the low-voltage domain and the corresponding circuit in the high-voltage domain of the electric vehicle, and can realize the transmission of signals or energy. If the isolation chip 50 receives an external switch signal sent by an external controller (such as an MCU controller located in the high-voltage domain), the interference signal (such as a common-mode interference signal, etc.) in the external switch signal is isolated and processed accordingly to obtain a processed switch signal, and the processed switch signal is sent to the IGBT drive circuit, and then the IGBT drive circuit drives the IGBT module accordingly. The electrical isolation function of the isolation chip improves the safety, reliability and anti-interference ability of the control circuit of the AC-driven heating.

[0040] The present application also provides a control method for a heating device, which is applied to the heating device as described in any of the above embodiments. Figure 6 As shown, the control method of the heating device includes the following steps S210~S230.

[0041] S210, the AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module; wherein the voltage corresponding to the DC power with the preset waveform is a positive voltage; S220, the IGBT module inputs the DC power with the preset waveform to the connected PTC heater based on the preset on-off control strategy; S230: The PTC heater heats the object to be heated corresponding to the heating provided by the PTC heater based on the direct current of the preset waveform and the on-off control strategy.

[0042] In this embodiment, the heating device can be used in electric vehicles. For example, the heating device is set on the battery module in the electric vehicle. When the heating device needs to be started, it is only necessary to connect the AC rectifier bridge in the heating device to an external AC power source (such as a charging head or AC charging pile of a home charging device of an electric vehicle, which provides 220V AC power), and the AC power output by the AC power source can be converted into DC power with a preset waveform and then input into the IGBT module in the heating device, so that the PTC heater connected by the on-off control of the IGBT module can be heated accordingly. The DC power with a preset waveform is a positive voltage. When it is loaded on both ends of the PTC heater and is on-off controlled by the IGBT module, it can effectively control the PTC heater to generate heat and heat. Moreover, because the DC power with a preset waveform is a positive voltage, it also ensures that the voltage drop direction at both ends of the PTC heater remains unchanged, so that it can generate heat more stably.

[0043] In one embodiment, step S230 includes: The PTC heater generates heat according to the DC power of the preset waveform within the target heating time interval corresponding to the on-off control strategy, so as to heat the object to be heated accordingly.

[0044] In this embodiment, the on-off control strategy can be specifically set by an external controller and a corresponding control signal can be generated. For example, the on-off control strategy is set at least once per interval T (which is a positive number) to control the IGBT module to disconnect so that the PTC heater also stops working accordingly. Moreover, during specific implementation, the on-off control strategy can also include a target heating time interval, that is, the PTC heater starts and generates heat to heat the target to be heated within the target heating time interval. Through the precise control of the above on-off control strategy, the PTC heater works and generates heat based on the corresponding working mode.

[0045] The present application also provides a heating control method for an electric vehicle, which is applied to the electric vehicle as described in any of the above embodiments. Figure 7 As shown, the heating control method of the electric vehicle includes the following steps S310~S340.

[0046] S310, the AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module; S320, the IGBT module inputs the DC power with the preset waveform to the connected PTC heater based on the preset on-off control strategy; S330, the PTC heater heats the object to be heated in the vehicle corresponding to the heating provided by the PTC heater based on the DC power of the preset waveform and the on-off control strategy; S340: If the vehicle thermal management module detects that the current heating parameters have met the preset heating control conditions, it generates a corresponding stop heating signal and sends the stop heating signal to the IGBT module to put the IGBT module into a disconnected state.

[0047] In this embodiment, if an external controller (such as an MCU controller) is set in the high-voltage domain of the electric vehicle, the external switching signal generated by the external controller is directly transmitted from the high-voltage domain to the IGBT drive circuit in the control circuit of the AC driven heating. There may be interference signals, which may lead to inaccurate control of the IGBT drive circuit, thereby affecting the subsequent heating process.

[0048] After the isolation chip is used and the input end of the isolation chip is connected to the external controller, the current can be prevented from flowing directly between the corresponding circuit in the low-voltage domain and the corresponding circuit in the high-voltage domain of the electric vehicle through the electrical isolation function of the isolation chip, thereby improving the safety, reliability and anti-interference ability of the control circuit of the AC-driven heating. Specifically, if the isolation chip receives an external switch signal sent by an external controller (such as an MCU controller located in the high-voltage domain), the interference signal (such as a common-mode interference signal, etc.) in the external switch signal is isolated and processed accordingly to obtain a processed switch signal, and the processed switch signal is sent to the IGBT drive circuit, and then the IGBT drive circuit drives the IGBT module accordingly.

[0049] When it is necessary to start heating the battery or cabin (such as cabin seats, etc.) of the electric vehicle, it is only necessary to connect the AC rectifier bridge to an external AC power source (such as a charging head of a home charging device for an electric vehicle, etc.), so that the AC power output by the AC power source can be converted into DC power with a preset waveform and then input into the IGBT module, so that the PTC heater connected by the on-off control of the IGBT module can perform corresponding heating; wherein, the voltage corresponding to the DC power with the preset waveform is a positive voltage.

[0050] The on-off control strategy can be specifically set by an external controller and a corresponding control signal can be generated. For example, the on-off control strategy is set at least once per interval T (which is a positive number) to control the IGBT module to disconnect so that the PTC heater also stops working accordingly. Moreover, during specific implementation, the on-off control strategy can also include a target heating time interval, that is, the PTC heater starts and generates heat to heat the target to be heated within the target heating time interval. Through the precise control of the above on-off control strategy, the PTC heater works and generates heat based on the corresponding working mode.

[0051] Moreover, the current heating parameters can also be detected by the electric vehicle thermal management module (which is a comprehensive system for controlling and adjusting the temperature of various vehicle components). If it is detected that the current heating parameters have met the preset heating control conditions, a corresponding stop heating signal is generated and sent to the IGBT module to make the IGBT module disconnected, thereby stopping the heating process of the battery or the cabin waiting to be heated. By detecting the working parameters of the heating device, the above heating process can be controlled more accurately.

[0052] In one embodiment, step S340 includes: If it is detected that the current heating duration is equal to the preset heating duration in the preset heating control condition, or if it is detected that the detection point temperature of the current battery module is equal to the preset maximum heating temperature in the preset heating control condition, the stop heating signal is generated accordingly.

[0053] In this embodiment, taking the battery module of an electric vehicle as an example, the current heating parameter detected by the thermal management module of the whole vehicle can be the current heating duration, or the detection point temperature detected by a temperature sensor at a certain detection point of the battery module. If it is detected that the current heating duration is equal to the preset heating duration in the preset heating control condition, or if it is detected that the detection point temperature of the current battery module is equal to the preset heating maximum temperature in the preset heating control condition, it means that the current heating parameter has met the preset heating control condition. At this time, the stop heating signal can be generated and sent to the IGBT module to make the IGBT module disconnected, thereby stopping the heating process of the battery module. It can be seen that more accurate battery module heating process control is achieved through the above process, which can more effectively improve the charging effect of the battery module during charging in low temperature areas.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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 control circuit for AC driven heating, characterized in that: include: An AC rectifier bridge and an IGBT module; the input end of the AC rectifier bridge is connected to an AC power source, and the output end of the AC rectifier bridge is connected to the input end of the IGBT module; the output end of the IGBT module is connected to a PTC heater as a controlled object; the AC rectifier bridge is used to convert the AC power output by the AC power source into a DC power with a preset waveform and then input it into the IGBT module, so that the PTC heater connected by the on-off control of the IGBT module performs corresponding heating; wherein the voltage corresponding to the DC power with the preset waveform is a positive voltage.

2. The control circuit for AC-driven heating according to claim 1, characterized in that: It also includes an IGBT drive circuit and an isolation chip; the input end of the IGBT drive circuit is connected to a low-voltage power supply and also to the output end of the isolation chip, the output end of the IGBT drive circuit is connected to the input end of the IGBT module; the input end of the isolation chip is connected to an external controller that can output an external switching signal.

3. A heating device, characterized in that: It comprises the control circuit for AC-driven heating as claimed in any one of claims 1 to 2, and also comprises a PTC heater connected to the output end of the IGBT module in the control circuit for AC-driven heating.

4. An electric vehicle, characterized in that: It comprises the heating device as claimed in claim 3, and the heating device is arranged in an electric vehicle and is used to heat an object to be heated in the electric vehicle.

5. A control method for AC-driven heating, applied to the control circuit for AC-driven heating as claimed in any one of claims 1 to 2, characterized in that: include: The AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module; wherein the voltage corresponding to the DC power with the preset waveform is a positive voltage; The IGBT module inputs the DC power with the preset waveform to the connected PTC heater to perform corresponding heating control based on the preset on-off control strategy.

6. The method according to claim 5, characterized in that The control circuit for AC-driven heating also includes an IGBT drive circuit and an isolation chip; the input end of the IGBT drive circuit is connected to a low-voltage power supply and is also connected to the output end of the isolation chip, and the output end of the IGBT drive circuit is connected to the input end of the IGBT module; the input end of the isolation chip is connected to an external controller that can output an external switch signal; Before the step of converting the AC power output by the AC power supply into DC power with a preset waveform by the AC rectifier bridge and then inputting the DC power into the IGBT module, the method further includes: If the isolation chip receives an external switch signal sent by an external controller, it performs corresponding isolation processing on the interference signal in the external switch signal to obtain a processed switch signal, and sends the processed switch signal to the IGBT drive circuit; If the IGBT driving circuit receives the processed switching signal, it generates a corresponding IGBT driving signal and sends the IGBT driving signal to the IGBT module to drive the IGBT module.

7. A method for controlling a heating device, applied to the AC-driven heating device as claimed in claim 3, characterized in that: include: The AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module; wherein the voltage corresponding to the DC power with the preset waveform is a positive voltage; The IGBT module inputs the DC power having the preset waveform to the connected PTC heater based on the preset on-off control strategy; The PTC heater heats the object to be heated corresponding to the heating provided by the PTC heater based on the direct current of the preset waveform and the on-off control strategy.

8. The method according to claim 7, characterized in that The PTC heater heats the object to be heated corresponding to the heating provided by the PTC heater based on the DC power of the preset waveform and the on-off control strategy, including: The PTC heater generates heat according to the DC power of the preset waveform within the target heating time interval corresponding to the on-off control strategy, so as to heat the object to be heated accordingly.

9. A heating control method for an electric vehicle, applied to the electric vehicle as claimed in claim 4, characterized in that: The heating device in the electric vehicle is arranged in the electric vehicle; the heating control method of the electric vehicle comprises: The AC rectifier bridge converts the AC power output by the AC power supply into DC power with a preset waveform and then inputs it into the IGBT module; The IGBT module inputs the DC power having the preset waveform to the connected PTC heater based on the preset on-off control strategy; The PTC heater heats the object to be heated in the vehicle corresponding to the heating provided by the PTC heater based on the DC power of the preset waveform and the on-off control strategy; If the vehicle thermal management module detects that the current heating parameters have met the preset heating control conditions, it will generate a corresponding stop heating signal and send the stop heating signal to the IGBT module to put the IGBT module in a disconnected state.

10. The method according to claim 9, characterized in that If it is detected that the current heating parameters have met the preset heating control conditions, a corresponding heating stop signal is generated, including: If it is detected that the current heating duration is equal to the preset heating duration in the preset heating control condition, or if it is detected that the detection point temperature of the current battery module is equal to the preset maximum heating temperature in the preset heating control condition, the stop heating signal is generated accordingly.

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