WO2023184093A1

WO2023184093A1 - Thermal management system, heating control method, and vehicle

Info

Publication number: WO2023184093A1
Application number: PCT/CN2022/083423
Authority: WO
Inventors: 张开翔; 陈博文
Original assignee: 华为技术有限公司
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2023-10-05

Abstract

Embodiments of the present application provide a thermal management system, a heating control method, and a vehicle. The present application has high control flexibility, can be applied to vehicles, and improves the vehicle integration level. The thermal management system comprises a first heating branch and a first switch branch coupled to the first heating branch; the first heating branch comprises a first heating module and a second heating module; the first heating module is used for converting electric energy into thermal energy; the second heating module is used for converting electric energy into thermal energy; the first switch branch comprises a first switch and a second switch; a first electrode of the first switch is coupled to a first end of the first heating module, a second electrode of the first switch is coupled to a first end of the second heating module, and a second electrode of the first switch is coupled to a first electrode of the second switch; a second end of the first heating module and a second end of the second heating module are both coupled to a first level end, and a second electrode of the second switch is coupled to a second level end.

Description

A thermal management system, heating control method and vehicle

Technical field

The present application relates to the field of electronic technology, and in particular to a thermal management system, a heating control method and a vehicle.

Background technique

Thermal management system is an important system of the vehicle. Thermal management systems are typically used to provide heating or cooling to the vehicle's battery, passenger compartment, and other parts of the vehicle. Thermal management systems generally include positive temperature coefficient thermal (positive temperature coefficient, PTC) circuits. PTC circuits can be used to heat other vehicle components. The resistance of the PTC circuit increases with temperature and has higher safety.

Figure 1 shows the existing PTC circuit topology. The existing PTC circuit has multiple PTC modules, and each PTC module is connected to the ground terminal through a corresponding independent single-tube switch. When the independent single-tube switch corresponding to the PTC module is in the on state, the PTC module outputs power (heating power). And when the independent single-tube switch corresponding to the PTC module is in an open circuit state, the PTC module does not output power (heating power). The existing PTC circuit topology control flexibility is poor, and it is difficult to meet the demand for improving vehicle integration.

Contents of the invention

Embodiments of the present application provide a thermal management system, a heating control method and a vehicle, which have high control flexibility and can be applied in vehicles to improve vehicle integration.

In the first aspect, embodiments of the present application provide a thermal management system that can be applied in heating scenarios. For example, thermal management systems can be used in vehicles. The thermal management system may include a first heating branch and a first switching branch coupled to the first heating branch. The first heating branch may include a first heating module and a second heating module. The first heating module may be a module capable of converting electrical energy into thermal energy. The second heating module may also be a module capable of converting electrical energy into thermal energy. The first switch branch may include a first switch and a second switch. In the embodiment of the present application, the first switch branch coupled to the first heating branch may also be called a switch branch corresponding to the first heating branch. The coupling relationship between the first heating branch and the first switching branch corresponding to the first heating branch will be introduced in detail below. The first pole of the first switch in the first switching branch corresponding to the first heating branch is coupled to the first end of the first heating module, and the second pole of the first switch is coupled to the second The first end of the heating module is coupled, and the second pole of the first switch is coupled with the first pole of the second switch. The second end of the first heating module is coupled to the first level end, and the second end of the second heating module is coupled to the first level end. The second pole of the second switch is coupled to the second level terminal. It can be seen that the first switch can connect or disconnect the first heating module and the second switch. The second switch can connect or disconnect the first switch and the second level terminal, and can also connect or disconnect the second heating module and the second level terminal.

In this embodiment of the present application, the working state of the first switch may include an on state and an off state. The working state of the second switch may include an on state and an off state. The output power (heating power) of the second heating module may be related to the electric energy obtained by the second heating module. Similarly, the output power of the first heating module may be related to the electrical energy obtained by the first heating module. The second switch is in a conductive state, which can connect the second heating module to the second level terminal, so that the second heating module can obtain electric energy and convert the electric energy into thermal energy to realize the heating function. The second switch is in the conductive state, and the first switch is in the conductive state, the first heating module can be connected to the second level terminal, so that the first heating module can obtain electric energy, and the first heating module can convert the electric energy into thermal energy to achieve heating function. It can be seen that by adjusting the working status of the first switch and the second switch in the first switch branch corresponding to the first heating branch, the total output power of the thermal management system can be adjusted.

In one possible design, the thermal management system may include N heating branches, and N may be an integer greater than or equal to 1. The first heating branch may be any heating branch among the N heating branches. In other words, the N heating branches may include at least one first heating branch. In such a design, the total output power of the thermal management system can be adjusted by adjusting the output power of each first heating branch.

In a possible design, the thermal management system may also include heating branches that are compatible with other types of heating branches besides the first heating branch, which are recorded as other heating branches. In other words, the thermal management system may include the N first heating branches and M at least one other heating branches. In some scenarios, the other heating branches may include a third heating module and a third switch. The third heating module can convert electrical energy into thermal energy. The third heating module and the third switch may be connected in series between the first level terminal and the second level terminal. When the third switch is in the on state, the third heating module can obtain electric energy and convert the electric energy into thermal energy to realize the heating function. It should be understood that the thermal management system provided by the present application can also be compatible with other types of heating branches.

In a possible design, the thermal management system may include N first switch branches. Each first switching branch is coupled to its corresponding first heating branch. In other words, when the thermal management system includes N first heating branches, the N first switch branches can correspond to the N first heating branches one-to-one, where N is an integer greater than or equal to 2.

In one possible design, the thermal management system may include multiple first switch branches. In the thermal management system provided by the embodiment of the present application, multiple first switch branches can be reused. At least two first switch branches among the plurality of first switch branches may be multiplexed to form a rectifier circuit. Rectifier circuits convert alternating current into direct current. In the scenario where the thermal management system is applied to a vehicle, such a design can improve the integration of the vehicle. For example, a rectification circuit formed by multiplexing at least two first switch branches can be used for the charging process of the vehicle's on-board charger. .

In a possible design, the thermal management system further includes a first switching module, a second switching module and at least two AC input terminals. In the plurality of first switch branches, the first pole of the first switch of each first switch branch passes through the first switching module and the first heating module. The second pole of the first switch is coupled with the first end of the second heating module through the first switching module. The plurality of first switch branches and the at least two AC input terminals correspond one-to-one to the first switch branch in each of the plurality of first switch branches. The second pole of a switch is coupled to the corresponding AC input terminal, and the first pole of the first switch is coupled to the first power supply circuit through the second switching module.

Embodiments of the present application provide a topology structure that supports switching the working mode of the first switch branch in a thermal management system. The first switching module is in the on state, and the second switching module is in the off state. By controlling the first switch and the second switch in each first switch branch, the output power of the thermal management system can be adjusted. The first switching module is in the off-circuit state, and the second switching module is in the on-state. By controlling the first switch and the second switch in the at least two first switch branches, the function of the rectifier circuit can be realized. In some examples, the function of the first switching module may be implemented by one or more electronic switches or mechanical switches. For example, the first switching module may include at least one relay or multiple switches to implement the function of the first switching module. Similarly, the function of the second switching module may be implemented by one or more electronic switches or mechanical switches. For example, the second switching module may include at least one relay or a plurality of switches to implement the function of the second switching module.

In one possible design, in order to improve the reliability of the thermal management system, the first switch and the second switch in the first switch branch can be provided in the same chip module. The complexity of producing and processing the patch module is low. The patch module has a large soldering area and high reliability. Therefore, there is no need to install additional fixing components to fix the patch module. And the patch module has a large heat dissipation area, which is conducive to heat dissipation.

In one possible design, the thermal management system can have multiple topologies. For example, the first level terminal is the ground terminal, and the second level terminal is the output terminal of the first power supply circuit. The first power supply circuit may be used to provide electrical energy to the first heating branch. The first switching branch is set on the side of the power loop close to the ground end. This topology can be called a low-side topology. For another example, the first level terminal is the output terminal of the first power supply circuit, and the second level terminal is the ground terminal. The first switch branch is arranged on the side of the power loop close to the first power supply circuit, that is, the side close to the high level. This topology can be a high-side topology.

In one possible design, the thermal management system may also include a control circuit. The control circuit may be coupled to the control terminal of the first switch and to the control terminal of the second switch. The control circuit may be used to provide a control signal to the first switch, or may be used to provide a control signal to the second switch. For example, the control circuit may provide a first level signal to the first switch, and the first switch may be in a conductive state driven by the first level signal. The control circuit may provide a second level signal to the first switch, and the first switch may be in an off-circuit state driven by the second level signal. Similarly, the control circuit may provide a third level signal to the second switch, and the second switch may be in a conductive state driven by the third level signal. The control circuit may provide a fourth level signal to the second switch, and the second switch may be in an off-circuit state driven by the fourth level signal. When the control circuit controls each first switch branch, a signal can be selected from the first level signal and the second level signal to be provided to the first switch, and a signal can be selected from the third level signal and the fourth level signal. A signal is provided to the second switch. In some examples, the control circuit may provide a driving signal to the first switch and a driving signal to the second switch according to the preset working state of the first switch and the working state of the second switch in each first switch branch.

In one possible design, the control circuit can obtain the target output power. The control circuit can control each of the first switch and the second switch with the target output power as the control target. For example, the control circuit may control the first switch and the second switch in each first switch branch based on the preset first relationship and the target output power, and according to the control information corresponding to the target output power. The first relationship may represent a corresponding relationship between each output power in the plurality of output powers and the control information, and the control information may include the operating state of the first switch in each first switch branch and the operating state of the second switch.

In a possible design, N is a positive integer greater than or equal to 2; the N heating branches include a plurality of the first heating branches. The plurality of first heating branches include a second heating branch and a third heating branch. The theoretical maximum output power of the first heating module in the second heating branch is the first power, and the theoretical maximum output power of the second heating module in the second heating branch is the first power. The theoretical maximum output power of the first heating module in the third heating branch is the second power, and the theoretical maximum output power of the second heating module in the third heating branch is the second power. Wherein, the ratio of the second power to the first power is 3.

In the circuit topology of the thermal management system provided by the embodiment of the present application, the ratio of the second power to the first power is 3. Among the multiple output powers in the preset first relationship, among the multiple output In a sequence in which the power is sorted from small to large, the difference between the latter output power and the previous output power of two adjacent output powers is a preset target value, and the target value is the value of the N heating branches. One-eighth of the theoretical maximum output power. Such a design can achieve uniform adjustment of output power. In the embodiment of the present application, the maximum value of the power that the heating module can support can be recorded as the theoretical maximum output power. Due to factors such as the environment in which the heating module is located and the circuit topology used, the actual maximum output power of the heating module may be different from the theoretical maximum output power. Similarly, in the embodiment of the present application, there is a difference between the theoretical output power of the heating module and the actual output power of the heating module.

In the embodiment of the present application, the control circuit can adjust the signal provided to the first switch and the signal provided to the second switch to change the total output power of each first heating branch. Each first switch branch may include multiple configuration states, each configuration state has a corresponding output power, and the corresponding output power is the theoretical output power of the first heating module corresponding to the first switch branch. For example, when the first switch branch is in the first configuration state, the second switch is in the on state, and the first switch is in the off circuit state, the corresponding output power of the first heating branch can be recorded as the first output power. In this case , the output power of the first heating module may be or close to its theoretical maximum output power. The output power of the second heating module may be or close to its theoretical maximum output power. In the second configuration state of the first switch branch, the second switch is in the on state and the first switch is in the off state. The corresponding output power of the first heating branch can be recorded as the second output power. In this case, the The output power of the second heating module may be or close to its theoretical maximum output power. When the first switch branch is in the third configuration state and the second switch is in the open circuit state, the corresponding output power of the first heating branch can be recorded as the third output power. In this case, the first heating module does not output power. The second heating module does not output power. It can be seen from the above introduction that the control method of the thermal management system provided by the embodiment of the present application is relatively flexible.

In one possible design, the control circuit may have the ability to generate a pulse width modulation (PWM) signal. A control circuit in the thermal management system is coupled to the control terminal of the first switch and to the control terminal of the second switch. The control circuit may provide a PWM signal to the first switch to control on or off of the first switch. The control circuit may also provide a PWM signal to the second switch to control on or off of the second switch.

In some examples, the control circuit may provide a fixed level signal to the first switch, for example, a fifth level signal, and the first switch is in an off-circuit state driven by the fifth level signal. In this case, the first heating module is disconnected from the second switch, and the first heating module fails to obtain electrical energy and does not output power. The control circuit can provide the first PWM signal to the second switch, and the second switch can connect or disconnect the second heating module and the second level terminal under the driving of the first PWM signal. For example, during the high level period of the first PWM signal, the second switch is in a conductive state, which can connect the second heating module to the second level terminal, and the second heating module can obtain (or receive) electric energy. During the low level period of the first PWM signal, the second switch is in an off-circuit state, which can disconnect the second heating module from the second level terminal, and the second heating module does not obtain electric energy. In some possible scenarios, the control circuit can also adjust the duty cycle of the first PWM signal to adjust the electric energy obtained by the second heating module.

In other examples, the control circuit may provide a fixed level signal to the second switch, for example, a sixth level signal, and the second switch is in a conductive state driven by the sixth level signal. In this case, the second heating module is connected to the second level terminal, and the second heating module can receive electrical energy and output power. The control circuit can provide a second PWM signal to the first switch, and the first switch can connect or disconnect the first heating module and the second switch under the driving of the second PWM signal. For example, during the high level period of the second PWM signal, the first switch is in the on state, and the first heating module and the second switch can be connected. Since the second switch is in the on state, the first heating module and the second switch are in the on state. The second level terminal is connected, and the first heating module can receive electrical energy and output power. During the low level period of the second PWM signal, the first switch is in an off-circuit state, the first heating module is disconnected from the second switch, and the first heating module fails to obtain electrical energy and does not output power. In some possible scenarios, the control circuit can also adjust the duty cycle of the second PWM signal to adjust the electric energy obtained by the first heating module. And this design can make the inrush current generated in the power loop smaller.

In one possible design, the control circuit can obtain the target output power. If the target output power is less than or equal to the first value, the fifth level signal is provided to the first switch, the first PWM signal is provided to the second switch, and the first PWM signal is The duty cycle is the ratio of the target output power to the first value, where the first value is the sum of the theoretical maximum output powers of all second heating modules in the N heating branches. If the target output power is greater than the first value, the sixth level signal is provided to the second switch, the second PWM signal is provided to the first switch, and the second PWM signal is The duty cycle is the ratio of the second value to the third value, wherein the second value is the difference between the target output power and the first value, and the third value is the N heating branches. The difference between the theoretical maximum total output power and the first value. It can be seen that the control circuit can adjust the duty cycle of the first PWM signal according to the target output power, thereby adjusting the output power of the thermal management system.

In a possible design, the control circuit in the thermal management system may be coupled with the control terminal of the first switch and the control terminal of the second switch. The control circuit is used to provide a third PWM signal to the second switch, and the second switch is driven by the third PWM signal to connect the second heating module to the second level end. or disconnected. And the control circuit may provide a seventh level signal to the first switch, wherein the first switch is in a conductive state driven by the seventh level signal. In this case, the first switch is in a conductive state, which can connect the first heating module to the second switch. During the high level period of the third PWM signal, the second switch is in the on state, the first heating module is connected to the second level terminal, the first heating module can receive electric energy, and the second heating module is also connected to the second level terminal. The two level terminals are connected, and the second heating module can receive electrical energy. In some scenarios, the control circuit can adjust the duty cycle of the third PWM signal, thereby adjusting the electric energy received by the first heating module and adjusting the electric energy received by the second heating module.

In a possible design, the control circuit can obtain the target output power. The seventh level signal is provided to the first switch, and the third PWM signal is provided to the second switch. The duty cycle of the third PWM signal is the target output power and the N The ratio of the theoretical maximum output power of a heating branch.

In a second aspect, embodiments of the present application provide a heating power control method, which can be applied to the thermal management system described in the first aspect and any of its designs. The method may be performed or implemented by a control circuit. The method includes controlling a circuit to obtain a target output power. The control circuit may control the first switch and the second switch in each of the switch branches according to the control information corresponding to the target output power based on the preset first relationship and the target output power. Wherein, the first relationship represents the corresponding relationship between each of the plurality of output powers and the control information, and the control information includes the working state of the first switch in each of the first switch branches, and the The working status of the second switch.

In a third aspect, embodiments of the present application provide a heating power control method, which can be applied to the thermal management system described in the first aspect and any of its designs. The method may be performed or implemented by a control circuit. The control circuit can obtain the target output power. If the target output power is less than or equal to a first value, a first level signal is provided to the first switch, and the first level signal is used to drive the first switch to be in an off-circuit state; and to provide the first switch with a first level signal. Two switches provide the first PWM signal, and the duty cycle of the first PWM signal is the ratio of the target output power to the first value, where the first value is the N heating branches. The sum of the theoretical maximum output power of all the second heating modules. If the target output power is greater than the first value, providing a second level signal to the second switch, the second level signal being used to drive the second switch to be in a conductive state; and providing the second switch with a second level signal. The first switch provides the second PWM signal, and the duty cycle of the second PWM signal is the ratio of a second value and a third value, wherein the second value is the target output power and the third value. The difference between a numerical value, the third numerical value is the difference between the theoretical maximum total output power of the N heating branches and the first numerical value.

In the fourth aspect, embodiments of the present application provide a heating power control method, which can be applied to the thermal management system described in the first aspect and any of its designs. The method may be performed or implemented by a control circuit. The method includes controlling the circuit to obtain the target output power. The control circuit may provide a first level signal to the first switch, and the first level signal is used to drive the first switch to be in a conductive state. The control circuit may provide the third PWM signal to the second switch, and the duty cycle of the third PWM signal is the ratio of the target output power to the theoretical maximum output power of the N heating branches.

In a fifth aspect, embodiments of the present application provide a vehicle, which may include the thermal management system described in the first aspect and any of its designs.

In a sixth aspect, embodiments of the present application provide a non-volatile computer-readable storage medium for storing a computer program, which is loaded by a processor to execute as in the second aspect and any possible design thereof. The method described in any one, or the method described in any one of the third aspect and any possible design thereof, or the method described in any one of the fourth aspect and any possible design thereof.

For the technical effects that can be achieved in the above second aspect to the fifth aspect, please refer to the description of the technical effects that can be achieved by the corresponding design in the above first aspect, and will not be repeated here.

Description of drawings

Figure 1 is a schematic structural diagram of an existing PTC circuit;

Figure 2 is a pin diagram of a single-tube switch;

Figure 3 is a schematic structural diagram of a thermal management system provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of another thermal management system provided by an embodiment of the present application;

Figure 5 is a schematic structural diagram of another thermal management system provided by an embodiment of the present application;

Figure 6 is a schematic diagram of the first level terminal and the second level terminal provided by the embodiment of the present application;

Figure 7 is a schematic diagram of a patch half-bridge module;

Figure 8 is a schematic structural diagram of another thermal management system provided by an embodiment of the present application;

Figure 9 is a schematic flow chart of a heating power control method provided by an embodiment of the present application;

Figure 10 is a schematic flow chart of another heating power control method provided by an embodiment of the present application;

Figure 11 is a schematic flowchart of yet another heating power control method provided by an embodiment of the present application.

Detailed ways

Currently, vehicles are often equipped with thermal management systems. In the embodiment of the present application, vehicles equipped with a thermal management system may include, but are not limited to, pure electric vehicles, hybrid electric vehicles, extended range electric vehicles, plug-in hybrid electric vehicles, or new energy vehicles.

Thermal management systems generally include PTC circuits. As shown in Figure 1, the existing PTC circuit includes multiple resistor branches. The resistor branches have a parallel relationship, and each resistor branch is arranged between the power supply and the ground terminal. Each resistor branch includes a PTC resistor and independent single-tube switch. For any resistor branch, when the independent single-tube switch in the resistor branch is in the on state, the PTC resistor in the resistor branch can obtain electrical energy to achieve output power (heating power). When the independent single-tube switch in the resistance branch is in an open-circuit state, the PTC resistor in the resistance branch cannot obtain electrical energy and cannot output power.

The independent single-tube switch in each resistor branch is generally a single-tube insulated gate bipolar transistor (IGBT) or a single-tube metal oxide semiconductor field effect transistor (metal oxide semiconductor field effector transistor, MOS) . The independent single-tube switch has many inherent shortcomings. Please refer to Figure 2. The pin of the single-tube switch is relatively long. If it is in an environment with strong vibration, the pin of the single-tube switch is easy to break, which poses a greater risk to reliability. Therefore, additional devices for fixing the single-tube switch are required. When the single-tube switch is installed in an existing PTC circuit, the single-tube switch needs to be attached to the insulating material, applied with thermal conductive glue, assembled on the structural parts, and then welded to the single board, etc., making the existing PTC circuit production and assembly process More cumbersome and complicated. In addition, the ground terminal of the control terminal of the single-tube switch (the terminal that receives the control signal) and the ground terminal of the PTC circuit belong to the same network. In actual application scenarios, the power fluctuation of the PTC circuit affects the single-tube switch, resulting in large single-tube switching losses. The heat dissipation surface of the single-tube switch is small and the heat generation is large in high-power scenarios. The single-tube switch has heat dissipation problems. Due to the many inherent shortcomings of the independent single-tube switch, the applicable scenarios of the existing PTC circuit are limited.

Usually, the functions of a vehicle can be realized through functional circuits provided in the vehicle. Increasing vehicle functions is generally achieved by adding corresponding functional circuits to the vehicle. For example, if a vehicle has a heating function, a PTC circuit needs to be added to the vehicle. Adding a PTC circuit will increase the overall space occupied by the functional circuit in the vehicle. In order to improve vehicle integration and reduce the space occupied by functional circuits in the vehicle, the PTC circuit can realize multiple functions, or the components in the PTC circuit can support different functions, which is conducive to improving the use efficiency of components in the vehicle. It can not only improve vehicle integration degree and can also reduce costs.

In view of this, this application provides a thermal management system that can support multiple control methods, has high control flexibility, and helps improve vehicle integration.

In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be described in further detail below in conjunction with the accompanying drawings. The specific operation methods in the method embodiments can also be applied to the device embodiments or system embodiments. It should be noted that in the description of this application, "at least one" refers to one or more, and "multiple" refers to two or more. In view of this, in the embodiment of the present invention, “plurality” may also be understood as “at least two”. "And/or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/", unless otherwise specified, generally indicates that the related objects are in an "or" relationship. In addition, it should be understood that in the description of this application, words such as "first" and "second" are only used for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating. Or suggestive order.

It should be pointed out that “coupling” in the embodiments of this application can be understood as electrical connection, and coupling between two electrical components can be direct or indirect coupling between two electrical components. For example, the coupling between A and B can be either direct coupling between A and B, or indirect coupling between A and B through one or more other electrical components, such as coupling between A and B, or direct coupling between A and C. C and B are directly coupled, and the coupling between A and B is realized through C. In some scenarios, "coupling" can also be understood as connection. In short, the coupling between A and B enables the transmission of electrical energy or signals between A and B.

FIG. 3 illustrates a thermal management system according to an exemplary embodiment, and the thermal management system may include a PTC circuit. The PTC circuit may include a first heating branch 101 and a first switching branch 201 coupled with the first heating branch. The first heating branch 101 may include a first heating module group 101A and a second adding module group 101B. Each first switch branch 201 may include a first switch 201A and a second switch 201B. The coupling relationship between any first heating branch 101 and its corresponding first switch branch 201 is introduced below. Please refer to Figure 3. The first heating branch 101 may include a first heating module 101A and a second heating module. Group 101B. The first switch branch corresponding to the first heating branch 101 is the first switch branch 201, and the first switch branch 201 includes a first switch 201A and a second switch 201B.

It should be pointed out that the switching tubes and switches in the embodiments of the present application can be one or more of various types of switching tubes such as relays, MOS transistors, bipolar junction transistors (BJT), IGBTs, etc. , the embodiments of this application will not enumerate them one by one. Each switch tube may include a first pole, a second pole and a control terminal, where the control terminal is used to control the conduction or disconnection of the switch tube. When the switch tube is in the conductive state, current can be transmitted between the first pole and the second pole of the switch tube. When the switch tube is in the off-circuit state, current cannot be transmitted between the first pole and the second pole of the switch tube. Taking MOSFET as an example, the control terminal of the switch tube is the gate, the first pole of the switch tube can be the source of the switch tube, the second pole can be the drain of the switch tube, or the first pole can be the drain of the switch tube. pole, and the second pole can be the source of the switch tube.

The first heating module 101A, the first switch 201A, and the second switch 201B are connected in series between the first level terminal and the second level terminal. In other words, the first pole of the first switch 201A is coupled with the first terminal of the first heating module 101A, and the second pole of the first switch 201A is coupled with the first pole of the second switch 201B, The second pole of the second switch 201B is coupled to the second level terminal, and the second terminal of the first heating module 101A is coupled to the first level terminal.

The branch circuit of the first heating module 101A and the first switch 201A is connected in parallel with the second heating module 101B. In other words, the second pole of the first switch 201A is coupled with the first terminal of the second heating module 101B, and the second terminal of the second heating module 101B is coupled with the first level terminal.

When the first switch 201A is in the conductive state, the first heating module 101A and the second switch 201B can be connected. When the first switch 201A is in the off-circuit state, the first heating module 101A can be disconnected from the second switch 201B. When the second switch 201B is in a conductive state, the first switch 201A can be connected to the second level terminal, and the second heating module 101B can be connected. When the second switch 201B is in the off-circuit state, the first switch 201A can be disconnected from the second level terminal, and the second heating module 101B can be disconnected.

In some possible implementations, the thermal management system provided by the embodiments of the present application may include N heating branches, and N may be a positive integer greater than or equal to 2. The N heating branches may include at least one of the aforementioned first heating branches 101 and a first switching branch 201 coupled with the first heating branch 101 . As shown in FIG. 4 , the N heating branches may also include at least one second heating branch 102 and a second switch branch 202 coupled with the second heating branch 102 . The second heating branch 102 may include a third heating module. The second switch branch 202 may include a third switch. The second heating branch 102 and the second switching branch 202 coupled thereto are connected in series between the first level terminal and the second level terminal. The third switch may be an independent single-tube switch. It can be seen that the second heating branch 102 and the second switching branch 202 can form the resistance branch in the aforementioned existing PTC circuit. Therefore, the thermal management system provided by the embodiment of the present application can be compatible with the resistor branch in the existing PTC circuit.

In other possible implementations, the thermal management system provided by the embodiment of the present application may include N heating branches, and the first heating branch 101 may be any one of the N heating branches. In other words, the thermal management system may include N first heating branches 101 described above. N can be a positive integer greater than or equal to 1.

The thermal management system may also include N first switching branches mentioned above, and the N first heating branches 101 may correspond to the N first switching branches 201 one-to-one. In the embodiment of this application, "one-to-one correspondence" can be understood as a first heating branch corresponding to a first switching branch, and a first switching branch corresponding to a first heating branch, where the first heating branch The corresponding first switching branch is also the first switching branch coupled to the first heating branch. As shown in FIG. 5 , when N is a positive integer greater than 1, that is, the thermal management system includes a plurality of first heating branches 101 and a plurality of first switching branches 201 . Each first heating branch 101 is coupled to a corresponding first switching branch 201 .

In the thermal management system, the first heating branch 101 may be coupled with a first power supply circuit, and the first power supply circuit may provide direct current. In some scenarios, the first power supply circuit may include a power supply or a battery. In one possible design, see (a) in Figure 6 , the first level terminal is the ground terminal HVGND, and the second level terminal is the output terminal of the first power supply circuit. The first switch branch 201 is provided on the side close to the first power supply circuit, which is also the high-voltage side of the PTC circuit. This topology can be called a high-side topology. Please refer to (b) in Figure 6. The first level terminal is the output terminal of the first power supply circuit, and the second level terminal is the ground terminal HVGND. The first switch branch 201 is disposed on a side away from the first power supply circuit, which is also the low-voltage side of the PTC circuit. Such a circuit topology can be called a low-side topology.

The first switch 201A and the second switch 201B in the first switch branch 201 form a half-bridge arm. The coupling point between the second pole of the first switch 201A and the first pole of the second switch 201B is the bridge arm midpoint. Therefore, the first switching branch 201 corresponding to the first heating branch 101 in the thermal management system provided by the embodiment of the present application can be regarded as the half-bridge arm corresponding to the first heating branch 101 . In each of the first heating branches 101, the first heating module 101A includes at least one heating component, such as a PTC component. The second heating module 101B may include at least one PTC component. The first heating module 101A can be used to convert electrical energy into thermal energy, and the second heating module 101B can be used to convert electrical energy into thermal energy. In the embodiment of the present application, the first heating module 101A converts electrical energy into thermal energy, which is actually the output power of the first heating module 101A. Similarly, the second heating module 101B converts electrical energy into thermal energy, which actually outputs power.

When the first switch 201A is in the on state and the second switch 201B is in the on state, the first heating module 101A can obtain electric energy and output power, and the second heating module 101B can also obtain electric energy and output power. Output Power. When the first switch 201A is in the off-circuit state and the second switch 201B is in the on-state, only the second heating module 101B can obtain electric energy and output power, and the first heating module 101A cannot obtain electric energy and cannot output power. power. When the second switch 201B is in the off-circuit state, neither the first heating module 101A nor the second heating module 101B can obtain electrical energy and cannot output power. It can be seen that in each first switch branch 201, the second switch 201B can be regarded as the main switch of the corresponding first heating branch 101. When the second switch 201B is in the off-circuit state, the corresponding first heating branch 101 does not output power.

By adjusting the on-off state (on or off state) of the first switch 201A and the on-off state of the second switch 201B in the half-bridge arm, the output power of the first heating module 101A in the first heating branch 101 is adjusted. and/or the output power of the second heating module 101B, thereby adjusting the output power of the first heating branch 101. Therefore, the output power of the PTC circuit provided by the embodiment of the present application has high flexibility.

SMD half-bridge devices (or modules) have high manufacturability and high reliability. The solder contact area of the pins of the chip-type half-bridge device is large, and it is not easy to break if it is in a strong vibration environment, so it has high reliability. In addition, chip-type half-bridge devices have a large heat dissipation area and are easy to dissipate heat. In any thermal management system provided based on the embodiments of the present application, the first switch 201A and the second switch 201B in each first switch branch 201 can be provided in the same chip module. Figure 7 exemplarily shows a patch module, or intelligent power module (intelligent power modules, IPM). As shown in (a) of Figure 7 , in the chip module, the first switch 201A also has a ground (GND) pin GND1, and the second switch 201B also has a ground pin GND2. The ground pin GND1 and the ground pin GND2 are used for coupling with the ground wire. Among them, the ground pin GND1 of the first switch 201A is coupled to the ground wire, and the circuit where the control terminal of the first switch 201A and the ground pin GND1 is located is recorded as the first circuit. The ground pin GND2 of the second switch 201B is coupled to the ground wire, and the circuit where the control terminal of the second switch 201B and the ground pin GND2 is located is recorded as the second circuit. The circuit where the ground terminal HVGND of the PTC circuit, the first heating module 101A, and the second heating module 101B are located is marked as the third circuit. The first loop and the second loop are both loops for transmitting control signals. The loop where the third loop is located is the loop used to transmit power. In this way, the control signal loop and the power loop can be separated, and the interaction between the heating module output power and the control signal is weak. Therefore, the power fluctuation of the PTC circuit has less impact on the control signal loop of the first switch branch 201.

As shown in (b) of Figure 7 , the first switch 201A in the SMD module is a SMD switch, and the second switch 201B is a SMD switch. Compared with independent single-tube switches, the production and processing of SMD devices is less complex and does not require additional fixing measures. In addition, chip-type devices have a larger heat dissipation area and are easy to dissipate heat. It should be noted that the patch module shown in (b) in Figure 6 is only used to illustrate the difference between the pins of the patch switch and the independent single-tube pins, and is not used as a thermal management system for the embodiment of the present application. The specific structures of the first switch and the second switch are limited.

Based on the thermal management system provided in any of the above embodiments, the thermal management system may further include a control circuit. The control circuit may be coupled to the control terminal of the first switch 201A in each of the first switch branches 201 and to the control terminal of the second switch 201B in each of the first switch branches 201 . The control circuit can control the first switch 201A to be turned on or off by providing a control signal to the first switch 201A. The control circuit can control the second switch 201B to be turned on or off by providing a control signal to the second switch 201B.

In one possible design, of the N first heating branches 101 and N first switching branches 201 in the thermal management system provided by the embodiment of the present application, N may be a positive integer greater than or equal to 2. At least two first switch branches 201 among the N first switch branches 201 may form a rectifier circuit, and the rectifier circuit may convert alternating current into direct current. For example, in a scenario where the thermal management system is installed in a vehicle, N first heating branches 101 and N first switching branches 201 can be installed on an on-board charger (OBC). At least two first switch branches 201 among the N first switch branches 201 may form a rectifier circuit for rectifying the received electric energy during the charging process of the vehicle charger. Such a design can improve the integration of the vehicle and reduce the number of switches installed in the vehicle.

Referring to (a) in FIG. 8 , the thermal management system may further include a first switching module 310 , a second switching module 320 and at least two alternating current input terminals.

The first switching module 310 can be used to connect or disconnect each first heating branch 101 and the corresponding first switching branch 201 . The second switching module 320 may be used to connect or disconnect the first pole of the first switch 201A in the at least two first switch branches 201 with the first power supply circuit. In each first switch branch 201, the first pole of the first switch 201A is coupled to the first end of the first heating module 101A through the first switching module 310, and the second pole of the first switch 201A is coupled through The first switching module 310 is coupled to the first end of the second heating module 101B.

The first switching module 310 may have multiple implementations to achieve the above functions. The implementation of the first switching module 310 is introduced below. It should be understood that the implementation of the first switching module 310 may include but is not limited to the implementation in the following introduction.

In one possible design, please refer to (a) in FIG. 8 , the first switching module 310 may include a first relay M1. The first pole of the first switch 201A in each first switch branch 201 is coupled with the first end of the first heating module 101A through the first relay M1. The second pole of the first switch 201A in each first switch branch 201 is coupled with the first end of the second heating module 101B through the first relay M1. When the first relay M1 is in a conductive state, the first relay M1 can connect each first heating branch 101 with the first switching branch 201 corresponding to the first heating branch 101, thereby realizing the first switching module. 310 is on. When the first relay M1 is in the off-circuit state, the first relay M1 disconnects each first heating branch 101 from the first switching branch 201 corresponding to the first heating branch 101, thereby realizing the first switching module 310 In a disconnected state.

In another possible design, please refer to (b) in FIG. 8 , the first switching module 310 may include N switching units 310A. N switching units 310A correspond to N first heating branches 101 in one-to-one correspondence. For any first heating branch 101, the first heating branch 101 can be coupled with the corresponding first switching branch 201 of the first heating branch 101 through the corresponding switching unit 310A.

In some examples, each switching unit 310A may include a relay. For any first heating branch 101, in the first heating branch 101, the first heating module 101A can be coupled with the corresponding first switch branch 201 through the relay in the corresponding switching unit 310A, and the second The heating module 101B can be coupled with the corresponding first switch branch 201 through a relay in the corresponding switching unit. The relay can be used to connect or disconnect the first heating branch 101 and the corresponding first switching branch 201 . The working status of each of the N switching units is the same. The relay in each switching unit is used to connect the corresponding first heating branch 101 and the first switching branch 201, so that the first switching module 310 can be in a conductive state. Alternatively, the relay in each switching unit is used to disconnect the corresponding first heating branch 101 from the first switching branch 201, so that the first switching module 310 can be in a disconnected state.

In other examples, each switching unit 310A may include a plurality of switching switches, such as a first switching switch and a second switching switch. For any first heating branch 101, the first heating module 101A in the first heating branch 101 can be connected to the corresponding first switch in the first switch branch 201 through the first switch in the corresponding switching unit 310A. The first pole of a switch 201A is coupled, and the second heating module 101B can be coupled with the second pole of the first switch 201A in the corresponding first switch branch 201 through the second switch. The first switch can be used to connect or disconnect the first heating module 101A and the first switch branch 201 . The second switch can be used to connect or disconnect the second heating module 101B from the first switch branch 201 .

The working states of the first switch and the second switch in each switching unit 310A are the same. If the first switch and the second switch in each switch unit 310A are in a conductive state, the first heating branch 101 can be connected to the corresponding first switch branch 201. Also, if the first switch and the second switch in each switch unit 310A are in an off state, the first heating branch 101 can be disconnected from the corresponding first switch branch 201. The working state of each switching unit 310A among the N switching units 310A is the same. Each switching unit 310A is used to connect the corresponding first heating branch 101 and the first switching branch 201 to realize that the first switching module 310 is in a conductive state. Alternatively, each switching unit 310A is used to disconnect the corresponding first heating branch 101 from the first switching branch 201, so that the first switching module 310 is in a disconnected state.

There may be at least two first switch branches 201 among the N first switch branches 201 for forming a rectifier circuit. At least two first switch branches 201 may correspond to at least two alternating current input terminals. The second pole of the first switch 201A of each of the at least two first switch branches 201 is connected to the second pole of the first switch 201A. The corresponding AC input terminal is coupled, and the second pole of the first switch 201 is coupled with the first power supply circuit through the second switching module 320 .

The second switching module 320 may have multiple implementation methods to implement the above functions. The implementation of the second switching module 320 is introduced below. It should be understood that the implementation of the second switching module 320 may include but is not limited to the implementation in the following introduction.

In a possible design, please refer to (a) in FIG. 8 again, the second switching module 320 may include a second relay M2. There may be at least two first switch branches 201 among the N first switch branches 201 for forming a rectifier circuit. The first pole of the first switch 201A in the at least two first switch branches 201 is coupled to the first power supply circuit through the second relay M2, and the second pole of the first switch 201A is coupled to the corresponding AC input terminal. The second relay M2 can connect the at least two first switch branches 201 with the first power supply circuit, so that the second switching module 320 is in a conductive state. Or the second relay M2 can disconnect the at least two first switch branches 201 from the first power supply circuit, so that the second switching module 320 is in an off-circuit state.

The following description will take the example that two first switch branches 201 among the N first switch branches 201 are used to form a rectifier circuit. In this case, the thermal management system may include two AC input terminals, which may be respectively referred to as the first AC input terminal in1 and the second AC input terminal in2.

Please refer to (a) in FIG. 8 again, the first switch branch 201D1 and the first switch branch 201D2 among the N first switch branches 201 can be used to form a rectifier circuit. For example, the second pole of the first switch D1-K1 of the first switch branch 201D1 is coupled to the first AC input terminal in1, and the first pole of the first switch D1-K1 of the first switch branch 201D1 passes through the second relay M2 coupled to the first power supply circuit. The second pole of the first switch D2-K1 of the first switch branch 201D2 is coupled with the second AC input terminal in2, and the first pole of the first switch D2-K1 of the first switch branch 201D2 is connected to the second relay M2 through the second relay M2. A power supply circuit is coupled.

The first alternating current input terminal in1 and the second alternating current input terminal in2 are coupled to the external power supply and used for receiving alternating current. The rectifier circuit formed by the first switch branch 201D1 and the first switch branch 201D2 can convert alternating current into direct current under the control of the control circuit and transmit it to the first power supply circuit through the second relay M2 to realize the control of the first power supply circuit. power supply or battery charging. When the second relay M2 is in the conducting state, the first switch D1-K1 in the first switch branch 201D1 is connected to the first power supply circuit, and the first switch D2-K2 in the first switch branch 201D2 is connected to the first power supply circuit. The circuit is connected. When the second relay M2 is in the off-circuit state, the first switch D1-K1 in the first switch branch 201D1 is disconnected from the first power supply circuit, and the first switch D2-K2 in the first switch branch 201D2 is disconnected from the first power supply circuit. The circuit is broken.

In another possible design, the second switching module 320 may include at least two third switching switches. At least two third switching switches correspond to the at least two first switch branches 201 one-to-one. The first pole of the first switch 201A in each of the at least two first switch branches 201 is coupled to the first power supply circuit through a corresponding third switch. The third switch can connect or disconnect the corresponding first switch branch 201 from the first power supply circuit. Each third switch connects the corresponding first switch branch 201 with the first power supply circuit, so that the second switching module 320 can be in a conductive state. Each third switching switch disconnects the corresponding first switch branch 201 from the first power supply circuit, so that the second switching module 320 is in a disconnected state.

Please refer to (b) in FIG. 8 again, the first switch branch 201D1 and the first switch branch 201D2 among the N first switch branches 201 can be used to form a rectifier circuit. For example, the second pole of the first switch D1-K1 of the first switch branch 201D1 is coupled to the first AC input terminal in1, and the first pole of the first switch D1-K1 of the first switch branch 201D1 is connected to the first switch Q1 through the switch Q1. The first power supply circuit is coupled. When the switch Q1 is in the on state, the first switch D1-K1 in the first switch branch 201D1 is connected to the first power supply circuit. When the switch Q1 is in the off-circuit state, the first switch D1-K1 in the first switch branch 201D1 is disconnected from the first power supply circuit. The second pole of the first switch D2-K1 of the first switch branch 201D2 is coupled with the second AC input terminal in2, and the first pole of the first switch D2-K1 of the first switch branch 201D2 is connected to the first switch Q2 through the switch Q2. Power supply circuit coupling. When the switch Q2 is in the on state, the first switch D2-K1 in the first switch branch 201D2 is connected to the first power supply circuit. When the switch Q2 is in the off-circuit state, the first switch D2-K1 in the first switch branch 201D2 is disconnected from the first power supply circuit.

The first alternating current input terminal in1 and the second alternating current input terminal in2 are coupled to the external power supply and used for receiving alternating current. The rectifier circuit formed by the first switch branch 201D1 and the first switch branch 201D2 can convert alternating current into direct current under the control of the control circuit and transmit it to the first power supply circuit through the second switching module 320 to realize the first power supply. Power supply in the circuit or battery charging. When the second switching module 320 is in the conductive state, the first switch D1-K1 in the first switch branch 201D1 is connected to the first power supply circuit, and the first switch D2-K2 in the first switch branch 201D2 is connected to the first power supply circuit. The power supply circuit is connected. When the second switching module 320 is in the off-circuit state, the first switch D1-K1 in the first switch branch 201D1 is disconnected from the first power supply circuit, and the first switch D2-K2 in the first switch branch 201D2 is disconnected from the first power supply circuit. The power supply circuit is disconnected.

The control circuit can control the switches in the first switch branch 201D1 and the first switch branch 201D2 to convert alternating current into direct current. The control circuit can adopt the control method of the existing rectifier circuit formed by two half-bridge arms to realize the rectifier circuit converting alternating current into direct current. This application does not place too many restrictions on the control method by which the control circuit controls the switches in the first switch branch 201D1 and the first switch branch 201D2 to convert alternating current into direct current.

The control circuit can control the first switching module 310 to be in a conductive state or a disconnected state, and can also control the second switching module 320 to be in a conductive state or a disconnected state. In one control mode, the control circuit can control the first switching module 310 to be in a conductive state, and the second switching module 320 to be in an off-circuit state. In this mode, the first switch branch 201D1 and the first switch branch 201D2 form a rectifier circuit. The control circuit can control the first switch branch 201D1 and the first switch branch 201D2 to convert alternating current into direct current. This situation can be recorded as rectification mode. In another control mode, the control circuit may control the first switching module 310 to be in the off-circuit state, and the second switching module 320 to be in the on-state. In this mode, N switching branches are used to form the power loop. The control circuit can control the N first switching branches 201 to adjust the output power of the N first heating branches 101 . This situation can be recorded as heating mode. It can be seen that in the thermal management system provided by the embodiment of the present application, the first switch branch 201D1 and the first switch branch 201D2 among the N first switch branches 201 are used in both the charging mode and the heating mode.

From the above description, it can be known that at least two first switch branches 201 in the thermal management system provided by the embodiment of the present application can be used to implement the charging mode and the heating mode. Similarly, in the thermal management system provided by the embodiment of the present application, more first switch branches among the N first switch branches can be used to form a rectifier circuit. For example, in a three-phase AC charging scenario, three first switch branches among the N first switch branches 201 can be used to form a rectifier circuit capable of converting three-phase AC power into DC power. For another example, in a four-phase alternating current charging scenario, four first switch branches among the N first switch branches can be used to form a rectifier circuit that can convert four-phase alternating current into direct current. The embodiments of this application do not limit this too much. Reusing the switches in the thermal management system for the OBC charging process can reduce the number of switches in the vehicle and reduce costs. Moreover, in the thermal management system provided by the embodiment of the present application, the control method for realizing the output heating power of the PTC circuit is relatively flexible and the control efficiency is high. Examples will be given later.

In an actual application scenario, in any first heating branch 101, the theoretical maximum output power of the first heating module 101A can be equal to the theoretical maximum output power of the second heating module 101B in the first heating branch 101. same. Alternatively, the theoretical maximum output power of the first heating module 101A in any first heating branch 101 may be different from the theoretical maximum output power of the second heating module 101B in the first heating branch 101 . Or the theoretical maximum output power of the first heating module 101A in two different heating branches may be the same or different. Similarly, the theoretical maximum output power of the second heating module 101B in two different heating branches may be the same or different. In other words, in the thermal management system provided by the embodiment of the present application, the theoretical maximum output power of the first heating module 101A in the N first heating branches 101 may be the same or different. The theoretical maximum output power of the second heating module 101B may also be the same or different. They are introduced separately below.

In some possible implementations, for each first heating branch 101 among the N first heating branches 101, the theoretical maximum output power of the first heating module 101A in each first heating branch 101 is the same as that of the first heating branch 101. The first power Pw1 is the same, and the theoretical maximum output power of the second heating module 101B in each first heating branch 101 is also the same as the first power Pw1. In other words, the theoretical maximum output power of the first heating module 101A in each first heating branch 101 is the same, and the theoretical maximum output power of the second heating module 101B in each first heating branch 101 is also the same. Similarly, the theoretical maximum output power of the first heating module 101A in each first heating branch 101 is the same as the theoretical maximum output power of the second heating module 101B.

In other possible implementations, there may be at least one first heating branch 101 in the N first heating branches 101. The theoretical maximum output power of the first heating module 101A in the N first heating branches 101 is different from that of the at least one first heating branch. The theoretical maximum output power of the first heating modules 101A in other first heating branches 101 other than the first heating branch 101 is different. Similarly, among the N first heating branches 101 , there may be at least one first heating branch 101 in which the theoretical maximum output power of the second heating module 101B is different from the theoretical maximum output power of the second heating module 101B except the at least one first heating branch 101 . The theoretical maximum output power of the second heating modules 101B in other first heating branches 101 is different.

In some examples, the N first heating branches 101 may include at least one first heating branch 101 of the first type and at least one first heating branch 101 of the second type. Wherein, the theoretical maximum output power of the first heating module 101A in each first type first heating branch 101 may be the first power Pw1, and the second heating module 101A in each first type first heating branch 101 The theoretical maximum output power of the heating module 101B may be the first power Pw1. The theoretical maximum output power of the first heating module 101A in each second type first heating branch 101 may be the second power Pw2. The second heating module in each second type first heating branch 101 The theoretical maximum output power of group 101B may be the second power Pw2. The ratio PD of the first power Pw1 and the second power Pw2 may be a preset value.

If the preset value is not equal to 1 and the ratio PD is not equal to 1, then the first power Pw1 and the second power Pw2 are not equal. The theoretical maximum output power of the first heating module 101A of each first type first heating circuit 101 is the same as the theoretical maximum theoretical output power of the second heating module 101B of each second type first heating circuit 101 The output power is different. The theoretical maximum output power of the second heating module 101B in each first type first heating branch 101 is the same as the theoretical maximum output power of the second heating module 101B in each second type first heating circuit 101 The output power is different.

If the preset value is equal to 1, the ratio PD is equal to 1, and the ratio PD is 1, then the first power Pw1 and the second power Pw2 are equal, that is, the theoretical value of the first heating module 101A in each first heating branch 101 The maximum output power is the same, the theoretical maximum output power of the second heating module 101B in each first heating branch 101 is the same, and the theoretical maximum output power of the first heating module 101A in each first heating branch 101 is the same. The output power is the same as the theoretical maximum output power of the second heating module 101B.

In the thermal management system provided in any of the above embodiments, the control circuit in the thermal management system can adjust the control signal of the first switch 201A and the control signal of the second switch 201B in each first switch branch 201 to adjust N The total output power of the first heating branch 101.

In a possible control method, the control circuit can selectively provide a first level signal or a second level signal to the first switch 201A. The control circuit may select one of the first level signal and the second level signal to provide to the first switch 201A. Wherein, the first switch 201A is in the on state when driven by the first level signal, and the first switch 201A is in the off state when driven by the second level signal. The first level signal and the second level signal are both fixed level signals. The fixed level signal may refer to a signal whose level is a fixed value, and may also be called a steady-state signal. The level of the first level signal may be recorded as the first level, and the level of the second level signal may be recorded as the second level, where the first level and the second level are different. The first switch 201A is in the on state when driven by the first level signal, and the first switch 201A is in the off state when driven by the second level signal.

The control circuit may selectively provide a third level signal or a fourth level signal to the second switch 201B. The control circuit may select one of the third level signal and the fourth level signal to provide to the second switch 201B. The second switch 201B is in the on state when driven by the third level signal, and the second switch 201B is in the off state when driven by the fourth level signal. Both the third level signal and the fourth level signal are fixed level signals. The third level signal can be recorded as the third level, and the level of the fourth level signal can be recorded as the fourth level, where the third level and the fourth level are different. The second switch 201B is in the on state when driven by the first level signal, and the second level switch is in the off state when driven by the fourth level signal.

In such a design, the control circuit adjusts the total output power of the N first heating branches 101, which can be recorded as a gear control mode. The embodiment of the present application provides a heating power control method. The control circuit can implement or execute the heating power control method to implement the gear control mode. The heating power control method implemented by the control circuit is introduced below. Referring to Figure 9, the heating power control method may include the following steps:

Step S301, the control circuit obtains the target output power.

The target output power can be regarded as the expected output power of the N first heating branches 101. By controlling the N first switching branches 201, the control circuit can realize that the output power of the N first heating branches 101 is or is close to the target output power. Desired output power. In some examples, the desired output power of the N first heating branches 101 may be determined based on a preset relationship between the temperature difference and the power. For example, the control circuit can obtain the user's desired temperature and the current ambient temperature, and use the difference between the user's desired temperature and the current ambient temperature as the target temperature difference. Combined with the preset relationship between temperature difference and power, the power corresponding to the target temperature difference is determined as the desired output power. Of course, this example is only used to illustrate one way for the control circuit to obtain the target output power. The control circuit can also obtain the target output power through other methods. For example, the control circuit may also receive target output power from other controllers in the vehicle. The embodiments of the present application do not specifically limit this.

Step S302: Based on the preset first relationship and the target output power, the control circuit controls the first switch 201A and the second switch 201A in each first heating branch 101 according to the control information corresponding to the target output power. The switch 201B is controlled so that the total output power of the N first heating branches 101 is the target output power.

The first relationship may be pre-stored in the vehicle's memory so that the control circuit can access said first relationship. Alternatively, the control circuit may include a memory, and the first relationship may be stored in the memory of the control circuit. In the embodiment of the present application, the first relationship may include multiple output powers and control information corresponding to each output power. The control information includes the working state of the first switch 201A in each first heating branch 101, and the working state of the second switch 201B.

Multiple output powers may be included in the first relationship. For ease of introduction, in a sequence of multiple output powers sorted from small to large, the i-th output power is recorded as P(i), and i can range from 1 to N. The control information corresponding to the output power P(i) may include the working status of the first switch 201A in the target first switch branch 201 (any one of the N first switch branches 201), and the The working state of the second switch 201B in the target first switch branch 201 is described.

The control information of the output power P(i) can be used by the control circuit to control the N first switching branches 201 to realize the N first heating branches 101 to output the output power P(i). The control circuit may generate a level signal corresponding to the working state of the first switch 201A according to the working state of the first switch 201A of the target first switch branch 201 in the control information of the output power P(i), and generate the level signal. The level signal is provided to the first switch 201A to drive the first switch 201A to be in this working state. Similarly, the control circuit can generate a level signal corresponding to the working state of the second switch 201B according to the working state of the second switch 201B of the target first switch branch 201, and provide the generated level signal to the second switch. 201B, to drive the second switch 201B to be in this working state. By controlling the first switch 201A and the second switch 201B of the target first switch branch 201, the control circuit can adjust the first heating module 101A and/or the first heating module 101A in the first heating branch 101 corresponding to the target first switch branch 201. Or the output power of the second heating module 101B, thereby adjusting the total output power of the N first heating branches 101.

For example, the N first switch branches 201 are respectively denoted as the first switch branch 2011, the first switch branch 2012, ..., and the first switch branch 201N. Take the first switch branch 2011 as an example. Assume that in the control information of the output power P(i), the operating state of the first switch 201A of the first switch branch 2011 is OFF, and the operating state of the second switch 201B of the first switch branch 2011 is ON. Among them, ON represents that the switch is in a conductive state, and OFF represents that the switch is in an open circuit state. It should be noted that the working state of the switch can also be in the form of numbers, characters, combinations of numbers and characters, etc., which are not specifically limited in the embodiments of the present application.

The control circuit can generate the aforementioned second level signal according to the working state of the first switch 201A of the first switch branch 2011 in the control information of the output power P(i), and provide it to the first switch branch 2011 of the first switch branch 2011. A switch 201A controls the first switch 201A of the first switch branch 2011 to be in an off-circuit state. The control circuit can generate the aforementioned third level signal according to the control information of the output power P(i) and the working state of the second switch 201B of the first switch branch 201 is ON, and provide it to the first switch branch 2011. The second switch 201B controls the second switch 201B of the first switch branch 2011 to be in a conductive state. The first switch 201A in the first switch branch 2011 is in the off-circuit state, and the second switch 201B is in the on-state, allowing the first heating module 101A in the first switch branch 2011 to obtain electrical energy and output power.

Similarly, the control circuit may control each first switch branch according to the working status of the first switch 201A and the working status of the second switch 201B of each first switch branch 201 in the control information of the output power P(i). The first switch 201A and the second switch 201B of the path 201 are controlled to control the output power of each first switch branch 201, thereby controlling the output power P(i) of the N first heating branches 101.

For ease of introduction, the following takes N equal to 2 as an example, and the N first switch branches 201 are respectively recorded as the first switch branch 2011 and the first switch branch 2012. The first relationship can be shown in Table 1 below.

Table 1,

In one possible situation, among the N first heating branches 101 , the theoretical maximum output power of the first heating module 101A in each first heating branch 101 is equal, and the first heating module 101A in each first heating branch 101 has the same theoretical maximum output power. The theoretical maximum output power of the first heating module 101A is the same as the theoretical maximum output power of the second heating module 101B, and the theoretical maximum output power is recorded as P0. Then in Table 1, the value of output power P(1) is equal to P0, the value of output power P(2) is equal to 2P0, the value of output power P(3) is equal to 3P0, and the value of output power P(4) is equal to 4P0. Different output powers can be understood as different gears. In a sequence in which the output powers are sorted from small to large, the difference between the adjacent output power P(i) and the output power P(i+1) may be a preset value, such as P0. In this case, by adding the first heating branch 101 and the first switching branch 201, the number (or gear levels) of the output power of the N first heating branches 101 can be increased.

In another possible situation, the N first heating branches 101 may include a first type first heating branch 101 and a second type first heating branch 101 . Among them, the theoretical maximum output power of the first heating module 101A in the first type first heating branch 101 is P0, and the theoretical maximum output power of the second heating module 101B is P0. The theoretical maximum output power of the first heating module 101A in each second type first heating branch 101 is 3P0, and the theoretical maximum output power of the second heating module 101B is 3P0. Taking N equal to 2 as an example, the first switch branch 201 corresponding to the first type of first heating branch 101 is recorded as the first switch branch 201W1, and the first switch branch 201 corresponding to the second type of first heating branch 101 It is recorded as the first switch branch 201W2. The first relationship can be shown in Table 2 below.

Table 2,

From Table 2, the value of output power P(1) is equal to P0, the value of output power P(2) is equal to 2P0, the value of output power P(3) is equal to 3P0, the value of output power P(4) is equal to 4P0, the value of output power P(5 ) value is equal to 5P0, the value of output power P(6) is equal to 6P0, the value of output power P(7) is equal to 7P0, and the value of output power P(8) is equal to 8P0. Different output powers can be understood as different gears. In a sequence in which the output powers are sorted from small to large, the difference between the adjacent output power P(i) and the output power P(i+1) may be a preset value, such as P0.

In this case, the N first heating branches 101 include two first heating branches 101. The theoretical maximum output power of the first heating module 101A in different first heating branches 101 is different, so that the N first heating branches 101 can have different theoretical maximum output powers. The heating branch 101 has more output power types, that is, more gears. For example, in this example, the theoretical maximum output power of the first heating module 101A in the first heating branch 101 of the second type is the theoretical maximum output power of the first heating module 101A in the first heating branch 101 of the first type. 3 times. The theoretical maximum output power of the first heating module 101A in the first type first heating branch 101, the theoretical maximum output power of the second heating module 101B in the first type first heating branch 101, the second type first heating The numerical relationship between the theoretical maximum output power of the first heating module 101A in the branch 101 and the theoretical maximum output power of the second heating module 101B in the second type first heating branch 101 complies with the numerical relationship 1:1:3. :3. Such a design can not only realize that the N first heating branches 101 support more output power, but also achieve uniform adjustment of the output power. That is, in the sequence of output power from small to large, the output power of the two adjacent ones is middle and last. The difference between one output power P(i+1) and the previous output power P(i) is a fixed value, such as P0. This fixed value is also eight points of the total output power 8P0 of the two first heating branches 101 one.

In another possible control method, the control circuit may have the ability to generate a PWM signal, or may also have the ability to provide a fixed level.

For example, for any one of the N first switch branches 201, the control circuit can selectively provide the first level signal or the second level signal to the first switch 201A. The control circuit may provide one of the first level signal or the second level signal to the first switch 201A. The first level signal is a fixed level signal. The second level signal is a fixed level signal. The first switch 201A is in the on state when driven by the first level signal, and the first switch 201A is in the off state when driven by the second level signal.

For another example, for any first switch branch 201 among the N first switch branches 201, the control circuit may provide the PWM_S1 signal to the first switch 201A in the first switch branch 201. Within the duration corresponding to the fifth level in the PWM_S1 signal, the first switch 201A can connect the first heating module 101A and the second switch 201B in the corresponding first heating branch 101 . Within the duration corresponding to the sixth level in the PWM_S1 signal, the first switch 201A can disconnect the first heating module 101A and the second switch 201B in the corresponding first heating branch 101 . Among them, within a switching cycle, the ratio of the duration corresponding to the fifth level to the total duration of the switching cycle can be recorded as the duty cycle q1 of PWM_S1. The duty cycle q1 is usually a value in [0, 1], that is, 0≤q1≤1.

When the control circuit controls the second switch 201B in the first switch branch 201 to be in the conductive state, the control circuit adjusts the duration of the first switch 201A in the conductive state during the switching cycle, thereby adjusting the first switch branch. 201 The electric energy obtained by the first heating module 101A of the first heating branch 101 corresponding to the first switching branch 101 in each switching cycle, thereby adjusting the power of the first heating module 101A of the first heating branch 101 corresponding to the first switching branch 201 Output Power. For example, the control circuit can adjust the duty cycle q1 of PWM_S1 to adjust the output power of the first heating module 101A in the first heating branch 101 corresponding to the first switching branch 201 .

Similarly, for any one of the N first switch branches 201, the control circuit can selectively provide the aforementioned third level signal or fourth level signal to the second switch 201B. The control circuit may provide one of the third level signal or the fourth level signal to the second switch 201B. The third level signal is a fixed level signal. The fourth level signal is a fixed level signal. The second switch 201B is in the on state when driven by the third level signal, and the second switch 201B is in the off state when driven by the fourth level signal.

For any one of the N first switch branches 201 , the control circuit may provide the PWM_S2 signal to the second switch 201B in the first switch branch 201 . During the duration corresponding to the seventh level in the PWM_S2 signal, the second switch 201B can connect the second heating module 101B in the corresponding first heating branch 101 to the second level end. Within the duration corresponding to the eighth level in the PWM_S2 signal, the second switch 201B can disconnect the second heating module 101B in the corresponding first heating branch 101 from the second level end. Among them, within a switching cycle, the ratio of the duration corresponding to the seventh level to the total duration of the switching cycle can be recorded as the duty cycle q2 of PWM_S2. The duty cycle q2 is usually a value in [0, 1], that is, 0≤q2≤1.

The control circuit adjusts the duration during which the second switch 201B is in the conductive state in each switching cycle, thereby adjusting the electric energy obtained by the second heating module 101B of each first heating branch 101 in each switching cycle, thereby adjusting each The output power of the second heating module 101B of the first heating branch 101. For example, the control circuit can adjust the duty cycle of PWM_S2 to adjust the output power of the second heating module 101B in the first heating branch 101 corresponding to the first switch branch 201.

In some examples, the sum of the theoretical maximum output powers of all second heating modules in the N heating branches is recorded as PK2. The control circuit can provide a second level signal to the first switch 201A in each first switch branch 201, so that the first switch 201A in each first switch branch 201 is in an off-circuit state. The control circuit provides PWM_S2 to the second switch 201B in each first switch branch 201 . In this case, the actual output power of each heating branch can be or close to the product of the theoretical maximum output power of the second heating module in the heating branch and the duty cycle q2 of PWM_S2, then the output power of the N heating branches P is PK1×q2. Since the numerical range of the duty cycle q2 is 0≤q2≤1, in this case, the numerical range of the output power of the N heating branches can be 0≤P≤PK1.

In other examples, the sum of the theoretical maximum output powers of all the first heating modules in the N heating branches is recorded as PK1. The control circuit may provide a third level signal to the second switch 201B of each first switch branch 201 to make the second switch 201B in each first switch branch 201 be in a conductive state. The control circuit provides PWM_S1 to the first switch 201A in each first switch branch 201 . In this case, the actual output power of the first heating module among the output powers of each heating branch may be or close to the product of the theoretical maximum output power of the first heating module and the duty cycle q1, and the actual output power of the second heating module The output power may be or be close to the theoretical maximum output power of the second heating module. Then the output power of N heating branches is PK2+PK1×q1. Since the numerical range of the duty cycle q1 is 0≤q1≤1, in this case, the numerical range of the output power of the N heating branches can be PK2≤P≤PK1+PK2. The maximum total output power of N heating branches can be recorded as PM. In this case, the numerical range of the output power of the N heating branches can be PK2≤P≤PM.

Through the above examples, it can be understood that the control circuit can adjust the PWM signal provided to the first switch 201A in each first switch branch 201 and the PWM signal provided to the second switch 201B to adjust the N first heating The total output power of branch 101. This control method can be recorded as PWM control method.

Embodiments of the present application also provide a heating power control method. The control circuit can implement or execute the heating power control method to implement a PWM control method, which generates a smaller inrush current and has a smaller impact on the switch. The heating power control method implemented by the control circuit is introduced below. Referring to Figure 10, the heating power control method may include the following steps:

Step S401, the control circuit obtains the target output power.

In the embodiment of the present application, the method for the control circuit to obtain the target output power pc can be referred to the relevant introduction of step S301 in the above embodiment, and will not be described again in this example.

Step S402, determine whether the target output power is less than or equal to a preset first power value, wherein the first power value is the theoretical maximum output power of all second heating modules in the N heating branches. If the sum is yes, the next step is step S403. If not, the next step is step S404.

Step S403, the control circuit provides a second level signal to the first switch 201A in each first switch branch 201, and provides a first pulse width modulation PWM signal to the second switch 201B in each first switch branch 201. .

In step S403, the second level signal is used to drive the first switch 201A to be in an off-circuit state. The control circuit can provide a second level signal to the first switch 201A in each first switch branch 201, so that the first switch 201A in each first switch branch 201 is in an off-circuit state. The first heating module 101A in each first heating branch 101 cannot obtain electrical energy and does not output power. The control circuit provides a first PWM signal to the second switch 201B in each first switch branch 201, and the duty cycle q2 of the first PWM signal is the target output power pc and the first power value (also the aforementioned PK2) ratio. At this time, the output power of each second heating module 101B in the N first heating branches 101 is PK2×q2, which is the target output power pc.

Step S404, the control circuit provides a second pulse width modulation PWM signal to the first switch 201A in each first switch branch 201, and provides a third pulse width modulation PWM signal to the second switch 201B in each first switch branch 201. level signal.

In step S404, the third level signal is used to drive the second switch 201B to be in a conductive state. The control circuit can provide a third level signal to the second switch 201B in each first switch branch 201, so that the second switch 201B in each first switch branch 201 is in a conductive state. The second heating module 101B in each first heating branch 101 obtains electric energy, and the actual output power of the second heating module 101B may be or close to the theoretical maximum output power of the second heating module 101B. The control circuit provides a second pulse width modulated PWM signal to the first switch 201A in each first switch branch 201, and the duty cycle q1 of the second PWM signal is the ratio of the second power value to the third power value. The second power value is the difference between the target output power pc and the first power value (also the aforementioned PK2). The third power value is the difference between the maximum total output power PM of the N heating branches and the first power value (PK2), that is, the sum of the theoretical maximum output powers PK1 of all first heating modules in the N heating branches. .

At this time, in each heating branch, the actual output power of the second heating module can be or close to the theoretical maximum output power of the second heating module, and the output power of the first heating module is the theoretical maximum output power of the first heating module. The product of the maximum output power and the duty cycle q1. The output power of N heating branches is PK2+PK1×q1, which is the target output power pc.

In another possible design, the control circuit may provide a first level signal to the first switch 201A in each first switch branch 201, so that the first switch 201A in each first switch branch 201 remains conductive. communication status. The control circuit can provide a third PWM signal to the second switch 201B in each first switch branch 201, and the duty cycle of the third PWM signal is denoted as q3, which can make the first switch 201B in each first heating branch 101 The actual output power of the heating module 101A may be or be close to the product of q3 and the theoretical maximum output power of the first heating module 101A, and the actual output power of the second heating module 101B may be or be close to the product of q3 and the theoretical maximum output power of the second heating module 101B. The product of the theoretical maximum output power, the total output power of the N first heating branches 101 is PM×q3.

Embodiments of the present application also provide a heating power control method. The control circuit can implement a PWM control method by implementing or executing the heating power control method. The heating power control method implemented by the control circuit is introduced below. Referring to Figure 11, the heating power control method may include one or more of the following steps:

Step S501, the control circuit obtains the target output power.

Step S502: The control circuit determines a target ratio, which is the target output power and the maximum total output power of the N first heating branches 101.

In step S503, the control circuit provides a first level signal to the first switch 201A in each first switch branch 201, and the first level signal is used to drive the first switch 201A to be in a conductive state.

In step S504, the control circuit provides a third pulse width modulation signal to the second switch 201B in each first switch branch 201, and the duty cycle of the third pulse width modulation signal is the target ratio.

Through the above introduction, it can be understood that the thermal management system provided by the embodiment of the present application can not only be applied in higher power scenarios, but also has smaller switching loss. It can also support a variety of heating power control methods and has high output power flexibility.

In addition, embodiments of the present application also provide a computer program product, including program instructions or codes. When the program instructions are run on a processor or controller, the program instructions are used to cause the processor or controller to execute the above-described method. Steps in a heating power control method according to various exemplary embodiments of the present application.

Embodiments of the present application also provide a readable storage medium that stores the aforementioned computer program product. The readable storage medium provided by the embodiment of the present application may be, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: electrical connection with one or more conductors, portable disk, hard disk, random access memory (RAM), read only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above.

An embodiment of the present application also provides a control device. The control device includes a processor and a memory. The memory is used to store programs, instructions or codes. The processor is used to execute the programs, instructions or codes in the memory to complete the control circuit in any of the above embodiments. One or more operations to perform.

An embodiment of the present application also provides a vehicle, which may include the thermal management system or control device provided in any of the above embodiments.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the protection scope of the present application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A thermal management system, characterized by comprising: a first heating branch and a first switching branch coupled with the first heating branch;

The first heating branch includes a first heating module and a second heating module; the first heating module is used to convert electrical energy into thermal energy; the second heating module is used to convert electrical energy into thermal energy; The first switch branch includes a first switch and a second switch;

Wherein, the first pole of the first switch is coupled to the first end of the first heating module, the second pole of the first switch is coupled to the first end of the second heating module, and the The second pole of the first switch is coupled with the first pole of the second switch; the second end of the first heating module and the second end of the second heating module are both coupled with the first level end, so The second pole of the second switch is coupled to the second level terminal.
The thermal management system of claim 1, wherein the thermal management system includes N heating branches, N is an integer greater than or equal to 1, wherein the first heating branch is the N Any heating branch of the heating branch.
The thermal management system of claim 2, wherein N is an integer greater than or equal to 2; the thermal management system includes N first switching branches, the N heating branches and the N The first switch branch has a one-to-one correspondence.
The thermal management system of claim 3, wherein the N switch branches include a plurality of first switch branches, and at least two first switches among the plurality of first switch branches The branch circuit is also used to form a rectifier circuit, which is used to convert alternating current into direct current.
The thermal management system of claim 4, wherein the thermal management system further includes a first switching module, a second switching module and at least two AC input terminals; the plurality of first switch branches , the first pole of the first switch of each first switch branch is coupled with the first end of the first heating module through the first switching module, and the second pole of the first switch The pole is coupled to the first end of the second heating module through the first switching module;

The plurality of first switch branches correspond to the at least two AC input terminals in a one-to-one manner, and the plurality of first switch branches in each of the first switch branches The second pole of the first switch is coupled to the corresponding AC input terminal. The first pole of the first switch is coupled to the first power supply circuit through the second switching module. The first power supply circuit is used to provide power to the third power supply circuit. A heating branch provides electrical energy.
The thermal management system according to any one of claims 1 to 5, wherein the first level terminal is a ground terminal, and the second level terminal is an output terminal of the first power supply circuit; or, the The first level terminal is the output terminal of the first power supply circuit, and the second level terminal is the ground terminal.
The thermal management system according to any one of claims 1 to 6, characterized in that the first switch and the second switch in the first switch branch are provided in the same patch module.
The thermal management system according to any one of claims 1 to 7, wherein the system further includes a control circuit; the control circuit is coupled to the control end of the first switch and coupled to the second switch. control terminal coupling;

The control circuit is used to selectively provide a first level signal or a second level signal to the first switch, wherein the first switch is in a conductive state driven by the first level signal. , the first switch is in an off-circuit state driven by the second level signal;

and selectively providing a third level signal or a fourth level signal to the second switch, wherein the second switch is in a conductive state driven by the third level signal, and the second switch It is in an off-circuit state driven by the fourth level signal.
The thermal management system of claim 8, wherein the control circuit is specifically used for:

Get the target output power;

Based on the preset first relationship and the target output power, control the first switch and the second switch in each of the first switch branches according to the control information corresponding to the target output power;

Wherein, the first relationship represents the corresponding relationship between each of the plurality of output powers and the control information, and the control information includes the working state of the first switch in each of the first switch branches, and the The working status of the second switch.
The thermal management system of claim 9, wherein N is a positive integer greater than or equal to 2; the N heating branches include a plurality of the first heating branches;

The plurality of first heating branches include a second heating branch and a third heating branch; the theoretical maximum output power of the first heating module in the second heating branch is the first power, The theoretical maximum output power of the second heating module in the second heating branch is the first power; the theoretical maximum output power of the first heating module in the third heating branch is the second power, The theoretical maximum output power of the second heating module in the third heating branch is the second power; wherein the ratio of the second power to the first power is 3.
The thermal management system according to any one of claims 1 to 7, wherein the system further includes a control circuit; the control circuit is coupled to the control end of the first switch and coupled to the second switch. control terminal coupling;

The control circuit is used to provide a first pulse width modulation PWM signal to the second switch. The second switch is driven by the first PWM signal to connect the second heating module and the third The two level terminals are connected or disconnected; and used to selectively provide a fifth level signal to the first switch, wherein the first switch is in an off-circuit state driven by the fifth level signal; or,

A control circuit configured to provide a second PWM signal to the first switch. The first switch is driven by the second PWM signal to connect or disconnect the first heating module and the second switch. On; and for providing a sixth level signal to the second switch, wherein the second switch is in a conductive state driven by the sixth level signal.
The thermal management system of claim 11, wherein the control circuit is also used to adjust the duty cycle of the first PWM signal; or,

The control circuit is also used to adjust the duty cycle of the second PWM signal.
The thermal management system according to claim 11 or 12, characterized in that the control circuit is specifically used for:

Get the target output power;

If the target output power is less than or equal to the first value, the fifth level signal is provided to the first switch, the first PWM signal is provided to the second switch, and the first PWM signal is The duty cycle is the ratio of the target output power to the first value, where the first value is the sum of the theoretical maximum output power of all second heating modules in the N heating branches;

If the target output power is greater than the first value, the sixth level signal is provided to the second switch, the second PWM signal is provided to the first switch, and the second PWM signal is The duty cycle is the ratio of the second value to the third value, wherein the second value is the difference between the target output power and the first value, and the third value is the N heating branches. The difference between the theoretical maximum total output power and the first value.
The thermal management system according to any one of claims 1 to 7, characterized in that the thermal management system further includes a control circuit; the control circuit is coupled to the control end of the first switch, and is coupled to the control end of the first switch. The control terminals of the two switches are coupled;

The control circuit is used to provide a third PWM signal to the second switch. The second switch is driven by the third PWM signal to connect the second heating module to the second level terminal. connected or disconnected; and used to provide a seventh level signal to the first switch, wherein the first switch is in a conductive state driven by the seventh level signal.
The thermal management system of claim 14, wherein the control circuit is further used to adjust the duty cycle of the third PWM signal.
The thermal management system according to claim 14 or 15, characterized in that the control circuit is specifically used for:

Get the target output power;

The seventh level signal is provided to the first switch, and the third PWM signal is provided to the second switch. The duty cycle of the third PWM signal is the target output power and the N The ratio of the theoretical maximum output power of a heating branch.
A heating power control method, characterized in that it is applied to the thermal management system according to any one of claims 1 to 16, and the method includes:

Get the target output power;

Based on the preset first relationship and the target output power, control the first switch and the second switch in each of the switch branches according to the control information corresponding to the target output power;

Wherein, the first relationship represents the corresponding relationship between each of the plurality of output powers and the control information, and the control information includes the working state of the first switch in each of the first switch branches, and the The working status of the second switch.
A heating power control method, characterized in that it is applied to the thermal management system according to any one of claims 1 to 16, and the method includes:

Get the target output power;

If the target output power is less than or equal to a first value, a first level signal is provided to the first switch, and the first level signal is used to drive the first switch to be in an off-circuit state; and to provide the first switch with a first level signal. Two switches provide the first PWM signal, and the duty cycle of the first PWM signal is the ratio of the target output power to the first value, where the first value is the N heating branches. The sum of the theoretical maximum output power of all second heating modules;

If the target output power is greater than the first value, providing a second level signal to the second switch, the second level signal being used to drive the second switch to be in a conductive state; and providing the second switch with a second level signal. The first switch provides the second PWM signal, and the duty cycle of the second PWM signal is the ratio of a second value and a third value, wherein the second value is the target output power and the third value. The difference between a numerical value, the third numerical value is the difference between the theoretical maximum total output power of the N heating branches and the first numerical value.
A heating power control method, characterized in that it is applied to the thermal management system according to any one of claims 1 to 16, and the method includes:

Get the target output power;

providing a first level signal to the first switch, the first level signal being used to drive the first switch to be in a conductive state;

The third PWM signal is provided to the second switch, and the duty cycle of the third PWM signal is the ratio of the target output power to the theoretical maximum output power of the N heating branches.
A vehicle, characterized by comprising the thermal management system according to any one of claims 1-16.