Energy conversion circuit, control circuit, method, storage medium, program, and vehicle

Abstract

The application provides an energy conversion circuit, a control circuit, a method, a storage medium, a program and a vehicle, and relates to the technical field of batteries. The application comprises an electronic control unit, a multiphase winding and a plurality of switches. The multiphase windings, the electronic control unit and the power supply are connected through the plurality of switches. The plurality of switches are configured to be closed or opened based on the state of the power battery; the multiphase bridge arms in the electronic control unit are configured to be turned on or turned off based on the state of the power battery; and the multiphase winding is configured to form different energy conversion circuits in combination with the closing or opening of the plurality of switches and the turning on or turning off of the multiphase bridge arms, and the direction of the current flowing through each phase winding is the same when each energy conversion circuit is working. The direction of the current flowing through each phase winding is the same, thereby avoiding the problem of current imbalance of the multiphase winding, improving the stability during charging, and greatly improving the charging experience of the user.

Description

[0001] This disclosure claims priority to Chinese patent application No. 2025104662358, filed on April 14, 2025, with the State Intellectual Property Office of the People's Republic of China, entitled "Energy Conversion Circuit, Energy Conversion Control Circuit and Energy Conversion Control Method", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of battery technology, and in particular to an energy conversion circuit, an energy conversion control circuit, an energy conversion control method, a computer-readable storage medium, a computer program product, and a vehicle. Background Technology

[0003] Currently, electric vehicles are developing rapidly, and numerous technologies have been applied to the charging and discharging of power batteries. Among these, boost charging is a very important technology, which enables a lower voltage power source to charge a higher voltage power battery.

[0004] The current technical solution for boost charging of electric vehicles is to use one phase coil of the motor connected in series with the other two phase coils. Although this increases the inductance of the boost charging circuit, this technical solution will cause the current in the three-phase windings of the motor to be unbalanced. During boost charging, the motor will vibrate due to the torque generated by the unbalanced three-phase current, which reduces the stability of boost charging. Summary of the Invention

[0005] The present invention provides an energy conversion circuit, an energy conversion control circuit, an energy conversion control method, a computer-readable storage medium, a computer program product, and a vehicle.

[0006] In a first aspect, the present invention provides an energy conversion circuit, the energy conversion circuit comprising: an electronic control unit and a multiphase winding;

[0007] The multiphase windings are connected to each other and to the electronic control unit through multiple switches. The multiple switches are configured to close or open based on different energy conversion modes, so that the electronic control unit and the multiphase windings are suitable for forming a corresponding energy conversion circuit with the power supply and / or power battery in the energy conversion mode.

[0008] When each energy conversion circuit is working, the current flowing through each phase winding is either in a first direction or a second direction. The first direction is from the electrically controlled end to the non-electrically controlled end, and the second direction is from the non-electrically controlled end to the electrically controlled end.

[0009] A second aspect of the present invention provides an energy conversion control circuit, including the energy conversion circuit described in the first aspect of the present invention;

[0010] A controller is connected to the electronic control unit and the plurality of switches, and is used to control the bridge arm of the electronic control unit to be turned on or off, and to control the plurality of switches to be turned on or off.

[0011] A third aspect of the present invention provides an energy conversion control method applied to the above-mentioned energy conversion circuit, comprising:

[0012] Control signals are sent to multiple switches and the electronic control unit according to the state of the power battery, so that the multiple switches are turned on or off according to different energy conversion modes. This makes the electronic control unit and the multi-phase winding suitable for forming a corresponding energy conversion circuit with the power source and / or the power battery in the energy conversion mode. When each energy conversion circuit is working, the direction of the current flowing through each phase winding is the same, flowing to the midpoint of the multi-phase winding or flowing out from the midpoint of the winding.

[0013] A fourth aspect of the present invention provides an electronic device including one or more processors; and one or more machine-readable media having instructions stored thereon, which, when executed by the one or more processors, cause the electronic device to perform the energy conversion control method as described in any of the first aspects of the present invention.

[0014] In a fifth aspect of the present invention, a computer-readable storage medium is provided, wherein a stored computer program causes a processor to perform the energy conversion control method as described in any of the first aspects of the present invention.

[0015] A sixth aspect of the present invention provides a computer program product, including a computer program / instructions, characterized in that, when the computer program / instructions are executed by a processor, they implement the energy conversion control method described in any of the first aspects of the present invention.

[0016] In a seventh aspect of the present invention, a vehicle is provided, the vehicle including the energy conversion circuit as described in the first aspect of the present invention.

[0017] This invention provides an energy conversion circuit, comprising an electronic control unit (ECU) and multiphase windings. The multiphase windings are connected to each other and to the ECU via multiple switches. These switches are configured to close or open based on different energy conversion modes, so that the ECU and the multiphase windings are suitable for forming corresponding energy conversion circuits with a power source and / or a power battery under the specified energy conversion mode. When each energy conversion circuit is operating, the current flowing through each phase winding is in either a first direction or a second direction. The first direction is from the ECU to the non-ECU, and the second direction is from the non-ECU to the ECU.

[0018] The energy conversion circuit provided in this embodiment of the invention utilizes multiple switches disposed between the multiphase windings and multiphase bridge arms, the power supply, and between the multiphase windings. By combining the closing or opening of these switches under different charging conditions, different structural forms of the multiphase windings are formed, resulting in different energy conversion circuits. Regardless of the structural form of the multiphase windings, the direction of current flow through each phase winding is the same, thereby avoiding the problem of current imbalance in the multiphase windings, improving the stability during boost charging, and greatly enhancing the user's charging experience. The energy conversion circuit of this embodiment has high practicality.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0021] Figure 1 This is a modular schematic diagram of an energy conversion circuit according to an embodiment of the present invention;

[0022] Figure 2 This is a circuit diagram of a preferred energy conversion circuit in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the winding energy storage during the boost charging process in the case of a multi-phase winding series boost charging energy conversion circuit in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the energy conversion circuit of multi-phase winding series boost charging in an embodiment of the present invention, showing the release of stored energy by the windings during the boost charging process;

[0025] Figure 5 This is a schematic diagram of the winding energy storage during the boost charging process in the case of a multi-phase winding parallel boost charging energy conversion circuit in an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the energy conversion circuit of multi-phase winding parallel boost charging in an embodiment of the present invention, showing the release of stored energy by the windings during the boost charging process;

[0027] Figure 7 This is a schematic diagram of the winding energy storage during the boost charging process in the case of a multi-phase winding series-parallel boost charging energy conversion circuit in an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the energy conversion circuit of multi-phase winding series-parallel boost charging in an embodiment of the present invention, showing the release of stored energy by the windings during the boost charging process;

[0029] Figure 9 This is a comprehensive embodiment of the present invention. Figure 2 The provided schematic diagram of the boost charging circuit structure is followed by schematic diagrams of the boost and buck charging circuit structures.

[0030] Figure 10 This is a schematic diagram of winding energy storage during the step-down charging process in the case of a multi-phase winding series-parallel step-down charging energy conversion circuit in an embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram of the energy conversion circuit of multi-phase winding series-parallel buck charging in an embodiment of the present invention, showing the release of stored energy by the windings during the buck charging process;

[0032] Figure 12 Based on the embodiments of the present invention Figure 9 The provided circuit structure diagrams for boost and buck charging are direct charging circuit structure diagrams.

[0033] Figure 13 This is a schematic diagram of direct charging in the case of the energy conversion circuit of direct charging in an embodiment of the present invention;

[0034] Figure 14 Based on the embodiments of the present invention Figure 9 The provided circuit diagrams for boost and buck charging include a self-heating circuit diagram.

[0035] Figure 15 This is a schematic diagram of the winding energy storage during the self-heating process in the case of a multi-phase winding parallel self-heating energy conversion circuit in an embodiment of the present invention;

[0036] Figure 16 This is a schematic diagram of the energy conversion circuit with multi-phase windings connected in parallel and self-heating in an embodiment of the present invention, showing the release of stored energy by the windings during the self-heating process;

[0037] Figure 17 This is a flowchart of an energy conversion control method according to an embodiment of the present invention;

[0038] Figure 18 This is a preferred flowchart in an embodiment of the present invention.

[0039] Figure label:

[0040] Power supply - CS; Power battery - E; First winding - L1; Second winding - L2; Third winding - L3; First switch - K1; Second switch - K2; Third switch - K3; Fourth switch - K4; Fifth switch - K5; Sixth switch - K6; Seventh switch - K7; Eighth switch - K8; Ninth switch - K9; Tenth switch - K11; Switch corresponding to the first stage of the power battery - K11; Switch corresponding to the second stage of the power battery - K12; Upper bridge arm in the first bridge arm - Q1, lower bridge arm - Q4; Upper bridge arm in the second bridge arm - Q2, lower bridge arm - Q5; Upper bridge arm in the third bridge arm - Q3, lower bridge arm - Q6; First capacitor - C1; Second capacitor - C2. Detailed Implementation

[0041] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0042] The energy conversion circuit of this invention includes: an electronic control unit and a multiphase winding. (Refer to...) Figure 1 The diagram shows a modular design of an energy conversion circuit, with multi-phase windings ( Figure 1 In this circuit, a single-phase winding (represented by a winding) and multiple-phase windings are connected to the electronic control unit (ECU) via multiple switches. These switches are configured to close or open based on different energy conversion modes. This allows the ECU and the multiple-phase windings to form corresponding energy conversion circuits with the power supply and / or the battery in different energy conversion modes. When each energy conversion circuit is operating, the current flowing through each phase winding follows either a first direction or a second direction. The first direction is from the ECU terminal to the non-ECU terminal, and the second direction is from the non-ECU terminal to the ECU terminal. For example: Figure 1 The example uses arrows from left to right to indicate that the direction of current flow through each phase winding is the same.

[0043] In one embodiment of the present invention, each bridge arm of the electronic control unit includes an upper bridge arm and a lower bridge arm. One end of the upper bridge arm serves as the first stage of the electronic control unit and is adapted to connect to the first electrode of the power battery. One end of the lower bridge arm serves as the second stage of the electronic control unit and is adapted to connect to the second electrode of the power battery. The other end of the upper bridge arm is connected to the other end of the lower bridge arm, serving as the midpoint of each bridge arm.

[0044] The multiphase winding includes: a first winding, the first end of which is connected to the midpoint of the first bridge arm of the electronic control unit; a second winding, the first end of which is connected to the midpoint of the second bridge arm of the electronic control unit; and the second ends of the first and second windings connected to the midpoint of the windings. Naturally, it is understood that since most motors are currently three-phase winding motors, the multiphase winding also includes: a third winding, the first end of which is connected to the midpoint of the third bridge arm of the electronic control unit, and the second end of which is connected to the midpoint of the windings. Of course, the energy conversion circuit of this invention can also be implemented if only the first and second two-phase windings are used, or if the motor has three-phase windings but only two-phase windings are used. Furthermore, for the series-parallel boost charging described below, the corresponding motor must be a three-phase winding or have three or more windings; otherwise, series-parallel connection cannot be achieved. For the other boost charging, buck charging, self-heating, and direct charging methods, the corresponding motor can be a two-phase winding, a three-phase winding, or have three or more windings.

[0045] For each switch, including: the first switch to the twelfth switch, where:

[0046] The first switch has its first end connected to the first pole of the electronic control unit, and its second end is adapted to connect to the first power port (an external port in the power supply structure; generally, the power supply refers to a charging pile, so the first power port can also be understood as the positive pole of the charging pile); the second switch has its first end connected to the first winding, and its second end connected to the midpoint of the first bridge arm; the third switch has its first end connected to the first power port, and its second end connected to the first end of the second switch; the fourth switch has its first end connected to the midpoint of the first bridge arm of the electronic control unit, and its second end connected to the first end of the fifth switch; the fifth switch has its first end connected to the second end of the first winding, and its second end connected to the second end of the second winding; the sixth switch has its first end connected to the second end of the second winding, and its second end connected to the second end of the third winding.

[0047] The seventh switch has its first end connected to the second end of the third winding, and its second end is adapted to connect to the second power port. The eighth switch has its first end connected to the second end of the second winding, and its second end is connected to the first end of the third winding. The ninth switch has its first end connected to the second terminal of the electronic control unit, and its second end is adapted to connect to the second power port (another external port in the power supply structure; generally, the power supply refers to the charging pile, so the second power port can also be understood as the negative terminal of the charging pile). The tenth switch has its first end connected to the second end of the first winding, and its second end is adapted to connect to the positive terminal of the power battery. The eleventh switch has its first end connected to the first terminal of the electronic control unit, and its second end is adapted to connect to the positive terminal of the power battery. The twelfth switch has its first end connected to the second terminal of the electronic control unit, and its second end is adapted to connect to the negative terminal of the power battery.

[0048] It should also be noted that, assuming the motor has a first and second winding and no third winding, the eighth and sixth switches are omitted, and the two ends of the seventh switch are adapted to connect to the second end of the second winding and the second power port, respectively, with the rest of the structure remaining unchanged. If the motor has a third winding, but the energy conversion circuit only uses the first and second windings, the eighth switch is omitted, while the sixth and seventh switches cannot be omitted. The two ends of the seventh switch are adapted to connect to the second end of the third winding and the second power port, respectively, with the rest of the structure remaining unchanged.

[0049] The closing or opening of the switches is determined by the state of the power battery. The control unit sends control signals to each switch according to the state of the power battery, so that each switch is closed or opened. For the power battery, the power battery state includes: boost charging, buck charging, direct charging, or self-heating, which corresponds to 4 different energy conversion modes: boost charging mode, buck charging mode, direct charging mode, or self-heating mode.

[0050] Generally, after an electric vehicle is connected to a power source, the vehicle communicates with the power source through a controller (e.g., Vehicle Control Unit, Battery Management System, etc.). After data exchange, the two determine which of the three charging methods—boost charging, buck charging, or direct charging—to use for the battery. Therefore, the corresponding battery states are: boost charging, buck charging, or direct charging. Additionally, there is a self-heating state, in which the battery does not charge.

[0051] For the energy conversion circuit proposed in this invention, if the energy conversion circuit needs to switch between the above four modes to form corresponding energy conversion loops, then all 12 switches need to be set. However, if considering factors such as cost, area overhead, and wiring complexity, the energy conversion circuit only needs to implement one, two, or three modes to form corresponding energy conversion loops, then it is not necessary to set all 12 switches. The following uses a three-phase winding as an example to explain these situations one by one.

[0052] If the energy conversion circuit only needs to implement the boost charging mode and form the corresponding energy conversion loop, then only 10 of the above 12 switches need to be set: the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the eleventh switch, and the twelfth switch. Since the boost charging mode is further divided into three types: series boost charging mode, parallel boost charging mode, and series-parallel boost charging mode, specifically:

[0053] If only the series boost charging mode is required, then only the third, fourth, seventh, eighth, eleventh, and twelfth switches need to be set. If only the parallel boost charging mode is required, then only the first, second, fifth, sixth, seventh, eleventh, and twelfth switches need to be set. If only the series-parallel boost charging mode is required, then only the third, fourth, sixth, seventh, eleventh, and twelfth switches need to be set.

[0054] If the energy conversion circuit only needs to implement the step-down charging mode to form the corresponding energy conversion loop, then only eight switches need to be set out of the above 12 switches: the first switch, the second switch, the fifth switch, the sixth switch, the ninth switch, the tenth switch, the eleventh switch, and the twelfth switch.

[0055] If the energy conversion circuit only needs to achieve the self-heating mode and form the corresponding energy conversion loop, then only the second, fifth, sixth, tenth, and twelfth switches need to be set out of the above 12 switches.

[0056] If the energy conversion circuit only needs to implement the direct charging mode and form the corresponding energy conversion loop, then only four of the above 12 switches need to be set: the first switch, the ninth switch, the eleventh switch, and the twelfth switch.

[0057] Based on the above-described energy conversion circuit, this embodiment of the invention also proposes an energy conversion control circuit, which includes: the energy conversion circuit described in any of the above-described embodiments; a controller, the controller being connected to an electronic control unit and multiple switches, used to control the bridge arm of the electronic control unit to be turned on or off, and used to control the multiple switches to be turned on or off.

[0058] For boost charging energy conversion mode: In boost charging, multiple switches are configured to close or open based on a first signal, and multi-phase bridge arms are configured to conduct or open based on a first signal; multi-phase windings are configured to combine the closing or opening status of each switch and the conducting or opening status of each phase bridge arm to form an energy conversion circuit of multi-phase winding series boost charging, multi-phase winding parallel boost charging, or multi-phase winding series-parallel boost charging, so that the electrical energy output by the power supply is boosted and converted to charge the power battery.

[0059] Among these, the first signal is a signal that enables some of the switches among multiple switches to close, and the upper or lower bridge arm in the multi-phase bridge arm to conduct, so as to form an energy conversion circuit of multi-phase winding series boost charging, multi-phase winding parallel boost charging, or multi-phase winding series-parallel boost charging.

[0060] To better understand the energy conversion control circuit proposed in this invention, please refer to... Figure 2 The diagram shows a preferred energy conversion control circuit. Figure 2 The example shown uses a common three-phase winding and three-phase bridge arm. For other windings and bridge arms, those skilled in the art can refer to... Figure 2 The results shown can be obtained through simple reasoning and are all within the protection scope of the technical solution of this invention.

[0061] Figure 2 As shown, the multiphase winding includes: a first winding L1, a second winding L2, and a third winding L3; multiple switches include: a first switch K1 to an eighth switch K8; the multiphase bridge arm includes: a first bridge arm, a second bridge arm, and a third bridge arm, each bridge arm including an upper bridge arm and a lower bridge arm, that is: the first bridge arm consists of an upper bridge arm Q1 ( Figure 2 The bridge arm (represented by the circuit symbol of the transistor) consists of the upper bridge arm Q2 and the lower bridge arm Q5, the second bridge arm consists of the upper bridge arm Q2 and the lower bridge arm Q5, and the third bridge arm consists of the upper bridge arm Q3 and the lower bridge arm Q6. Figure 2 To more fully illustrate the structure of the entire energy conversion circuit, the two-stage switches K11 and K12 of the power battery E are also shown as an example, namely, the positive switch K11 and the negative switch K12 of the power battery E. The first capacitor C1 is the regulated voltage of the power battery E, and the second capacitor C2 is the regulated voltage capacitor of the power supply CS.

[0062] One end of the upper bridge arm serves as the first stage of the electronic control unit, suitable for connecting to the first terminal (positive terminal of the power battery E). One end of the lower bridge arm serves as the second stage of the electronic control unit, suitable for connecting to the second terminal (negative terminal of the power battery E). The other end of the upper bridge arm is connected to the other end of the lower bridge arm, serving as the midpoint of the bridge arm. Figure 2 The diagram also exemplarily illustrates a controller CN that sends control signals to the gates of the transistors in each bridge arm to control the transistors to turn on or off, thereby controlling the turn-on or turn-off of the upper or lower bridge arm.

[0063] The first and second ends of the first winding L1 are connected to the midpoint of the first bridge arm (i.e., the source of Q1 and the drain of Q4) via the second switch K2 and the fourth switch K4, respectively. The first end of the first winding L1 is also connected to the first stage of the power supply CS via the third switch K3, and is also connected to the upper bridge arm via the third switch K3 and the first switch K1 connected in series with the third switch. Figure 2 One end of the drain of Q3 is connected. The second end of the first winding L1 is also connected to the second end of the second winding L2 through the fifth switch K5.

[0064] The first end of the second winding L2 is connected to the midpoint of the second bridge arm (i.e., the source of Q2 and the drain of Q5); the second end of the second winding L2 is also connected to the second end of the third winding L3 through the sixth switch K6, and is also connected to the first end of the third winding L3 through the eighth switch K8; the first end of the third winding L3 is connected to the midpoint of the third bridge arm (i.e., the source of Q3 and the drain of Q6); the second end of the third winding L3 is also connected to the second terminal of the power supply through the seventh switch K7.

[0065] Boost charging includes: boost charging where the power supply's output current exceeds a preset current, boost charging where the voltage difference between the power supply and the battery exceeds a preset boost value, or boost charging where the voltage difference is not greater than the preset boost value and the output current is not greater than the preset current. The different winding structures corresponding to these three boost charging methods result in different inductance values ​​in the energy conversion circuit, adapting to various boost charging conditions: when a large overcurrent capacity is required (when the power supply's output current is large), the three-phase windings are connected in parallel; when the voltage difference between the power supply and the battery is large, the three-phase windings are connected in series to increase the inductance of the energy conversion circuit and reduce ripple current; and when the voltage difference is not greater than the preset boost value and the output current is not greater than the preset current, the three-phase windings are connected in series and parallel, with the inductance of the energy conversion circuit falling between that of series and parallel windings.

[0066] When the voltage difference between the power source and the power battery is greater than the preset boost amount during boost charging, the energy conversion modes include: series boost charging; the multi-phase windings are configured to combine the closed or open status of each switch and the on or off status of each phase bridge arm to form a multi-phase winding series boost charging energy conversion circuit.

[0067] When the output current of the power supply is greater than the preset current for boost charging, the energy conversion modes include: parallel boost charging; the multi-phase windings are configured to combine the closed or open status of each switch and the on or off status of each phase bridge arm to form a multi-phase winding parallel boost charging energy conversion circuit.

[0068] Under the boost charging condition where the voltage difference is not greater than the preset boost amount and the output current is not greater than the preset current, the energy conversion mode includes: series-parallel boost charging; the multi-phase winding is configured to combine the closed or open state of each switch and the on or off state of each phase bridge arm to form a multi-phase winding series-parallel boost charging energy conversion circuit.

[0069] Generally, when the power supply voltage is lower than the battery voltage, the vehicle enters boost charging mode, and the battery is in a boost charging state. To determine the voltage difference between the two, a preset boost amount can be set. When the ratio of the highest power supply voltage to the highest battery voltage is greater than a certain value, it is determined that a large voltage gradient is needed, i.e., greater than the preset boost amount. This ratio is an empirical value obtained through extensive testing.

[0070] During charging, the power battery itself has a charging power requirement, which corresponds to a charging current requirement. The power supply's output current is also determined after the power supply is built. Therefore, when different electric vehicles are connected to the power supply, the power battery's charging current requirement may be greater than or less than the power supply's output current. Generally speaking, if it is boost charging, and the ratio between the power supply's maximum voltage and the power battery's maximum voltage is smaller, then the power supply's output current will almost never exceed the power battery's charging current requirement. Conversely, the larger the ratio between the power supply's maximum voltage and the power battery's maximum voltage, the more likely the power supply's output current will be greater than or equal to the power battery's charging current requirement. Therefore, a preset current can be set for different power batteries. This preset current can be equal to or slightly less than their charging current requirement. When the power supply's output current exceeds this preset current, the energy conversion circuit is formed by the large overcurrent capacity of the three-phase windings connected in parallel to charge the power battery.

[0071] For situations where the voltage difference is small and the output current is not greater than the preset current, the power supply's maximum voltage may be close to the power battery's maximum voltage, but the power supply's output current may be designed to be small. For example, a power supply with a maximum voltage of 750V needs to charge a power battery with a maximum voltage of 800V. The voltage difference between the two is not greater than the preset boost amount, but the power supply's output current is 200A, while the 800V power battery requires a charging current of 300A. In this case, three-phase windings need to be connected in series and parallel to form an energy conversion circuit to charge the power battery.

[0072] Based on the above theory, combined with Figure 3 The diagram shown illustrates the energy storage in the windings during the boost charging process in the case of a multi-phase winding series boost charging energy conversion circuit. Figure 4 The diagram shown illustrates the release of stored energy from the windings during the boost charging process in the case of a multi-phase winding series boost charging energy conversion circuit. Figure 3 , Figure 4 In all subsequent diagrams involving winding energy storage and energy release, all closed switches and current paths are connected by bold black lines to represent current paths. The handle of the closed switch is also shown as an example for easier visual understanding.

[0073] In the series boost charging mode, the controller CN controls the on / off state of the bridge arms of the electronic control unit and controls the closing / opening of multiple switches to alternately form the third and second energy conversion circuits. The third energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, and the power supply CS. The fourth energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, the third bridge arms Q3 and Q6, the power supply CS, and the power battery E. The current flowing through the first winding L1, the second winding L2, and the third winding L3 flows in the same direction. The following steps are repeatedly executed during the series boost charging process:

[0074] Step S1: Close the third switch K3, the fourth switch K4, the seventh switch K7, and the eighth switch K8, and connect the lower bridge arms Q4 and Q5 of the first and second bridge arms respectively. Disconnect the remaining switches and bridge arms, forming the third energy conversion circuit. The first winding L1, the second winding L2, and the third winding L3 form a series structure, as shown below. Figure 3 As shown by the middle arrow, the current flows from the positive terminal of the power supply CS → the third switch K3 → the first winding L1 → the fourth switch K4 → the bridge arm Q4 → the bridge arm Q5 → the second winding L2 → the eighth switch K8 → the third winding L3 → the seventh switch K7 → the negative terminal of the power supply CS, storing the electrical energy output by the power supply CS on the three-phase windings.

[0075] Step S2: After the first preset energy storage time, disconnect the lower bridge arm Q4 of the first bridge arm, and close the two-stage switches K11 and K12 of the power battery and the upper bridge arm Q1 of the first bridge arm to form the fourth energy conversion circuit. The electrical energy stored in the three-phase windings is superimposed with the electrical energy output from the power supply CS to boost the voltage. The current flows from the positive terminal of the power supply CS → the third switch K3 → the first winding L1 → the fourth switch K4 → bridge arm Q1 → the positive terminal switch K11 of the power battery E → the positive terminal of the power battery E → the negative terminal switch K12 of the power battery E → bridge arm Q5 → the second winding L2 → the eighth switch K8 → the third winding L3 → the seventh switch K7 → the negative terminal of the power supply CS, thus boosting and charging the power battery E.

[0076] Step S3: After the power battery has been charged for a second preset time, step S1 is executed.

[0077] It is understandable that, in the case of a two-phase winding motor, the first energy conversion circuit is formed by the first winding L1, the second winding L2, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, and the power supply CS; the second energy conversion circuit is formed by the first winding L1, the second winding L2, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, the power supply CS, and the power battery E; the current flows through the first winding L1 and the second winding L2 in the same direction. The specific closing and opening states of the switches and bridge arms, as well as the current flow direction, can be obtained through simple reasoning, referring to the case of the three-phase winding described above, and will not be elaborated further.

[0078] The above method forms a three-phase winding series boost charging energy conversion circuit to boost the power battery. During the boost charging process, the current direction of the three-phase windings is always the same, flowing towards the midpoint of the winding.

[0079] Based on the above theory, combined with Figure 5 The diagram shown illustrates the energy storage in the windings during the boost charging process in the case of a multi-phase winding parallel boost charging energy conversion circuit. Figure 6 The diagram shown illustrates the release of stored energy from the windings during the boost charging process in the case of a multiphase winding parallel boost charging energy conversion circuit.

[0080] In parallel boost charging mode, the controller CN controls the on / off state of the bridge arms of the electronic control unit and controls the closing / opening of multiple switches to alternately form the third and fourth energy conversion circuits. The third energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1 and Q4, the second bridge arms Q2 and Q5, the third bridge arms Q3 and Q6 of the electronic control unit, and the power supply CS. The fourth energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1 and Q4, the second bridge arms Q2 and Q5, the third bridge arms Q3 and Q6 of the electronic control unit, the power supply CS, and the power battery E. The current flowing through the first winding L1, the second winding L2, and the third winding L3 flows in the same direction. The following steps are repeatedly executed during the parallel boost charging process:

[0081] Step T1: Close the first switch K1, the second switch K2, the fifth switch K5, the sixth switch K6, and the seventh switch K7, turning on all upper bridge arms Q1, Q2, and Q3. Disconnect the remaining switches and bridge arms, forming the third energy conversion circuit. The first winding L1, the second winding L2, and the third winding L3 form a parallel structure. Current flows from the positive terminal of the power supply CS → the first switch K1 → bridge arms Q1, Q2, and Q3 → simultaneously to the second switch K2, the first winding L1, the fifth switch K5, the second winding L2, the sixth switch K6, and the third winding L3 → the seventh switch K7 → the negative terminal of the power supply CS, storing the electrical energy output by the power supply CS in the three-phase windings.

[0082] Step T2: After the first preset energy storage time, disconnect the upper bridge arms Q1, Q2, and Q3, and close the two-stage switches K11 and K12 of the power battery and all lower bridge arms Q4, Q5, and Q6 to form the fourth energy conversion circuit. The stored electrical energy is superimposed with the electrical energy output from the power supply CS to boost the voltage. The current flows from the positive terminal of the power supply CS → first switch K1 → positive switch K11 of the power battery E → positive terminal of the power battery E → negative terminal of the power battery E → negative switch K12 of the power battery E → bridge arms Q4, Q5, and Q6 → simultaneously to the second switch K2, the first winding L1, the fifth switch K5, the second winding L2, the sixth switch K6, and the third winding L3 → the seventh switch K7 → the negative terminal of the power supply CS, thus boosting and charging the power battery E.

[0083] Step T3: After charging the power battery for the second preset time, proceed to step T1.

[0084] The above method forms an energy conversion circuit for parallel boost charging of three-phase windings, which boosts the voltage of the power battery. During the boost charging process, the current direction of the three-phase windings is always the same, flowing towards the midpoint of the winding.

[0085] It is understandable that, in the case of a two-phase winding motor, the first energy conversion circuit is formed by the first winding L1, the second winding L2, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, and the power supply CS; the second energy conversion circuit is formed by the first winding L1, the second winding L2, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, the power supply CS, and the power battery E; the current flows through the first winding L1 and the second winding L2 in the same direction. The specific closing and opening states of the switches and bridge arms, as well as the current flow direction, can be obtained through simple reasoning, referring to the case of the three-phase winding described above, and will not be elaborated further.

[0086] Based on the above theory, combined with Figure 7 The diagram shown illustrates the energy storage in the windings during the boost charging process in the case of a multiphase winding series-parallel boost charging energy conversion circuit. Figure 8 The diagram shows the release of stored energy from the windings during the boost charging process in the case of a multiphase winding series-parallel boost charging energy conversion circuit.

[0087] In the series-parallel boost charging mode, the controller CN controls the on / off state of the bridge arms of the electronic control unit and controls the closing / opening of multiple switches to alternately form the fifth and sixth energy conversion circuits. The fifth energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1 and Q4, the second bridge arms Q2 and Q5, the third bridge arms Q3 and Q6 of the electronic control unit, and the power supply CS. The sixth energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1 and Q4, the second bridge arms Q2 and Q5, the third bridge arms Q3 and Q6 of the electronic control unit, the power supply CS, and the power battery E. The current flowing through the first winding L1, the second winding L2, and the third winding L3 flows in the same direction. The following steps are repeatedly executed during the series-parallel boost charging process:

[0088] Step V1: Close the third switch K3, the fourth switch K4, the sixth switch K6, and the seventh switch K7, turning on all lower bridge arms Q4, Q5, and Q6. Disconnect the remaining switches and bridge arms, forming the fifth energy conversion circuit. The first winding L1, the second winding L2, and the third winding L3 form a series-parallel structure (the second winding L2 and the third winding L3 are connected in parallel and then in series with the first winding L1). Current flows from the positive terminal of the power supply CS → the third switch K3 → the first winding L1 → the fourth open tube K4 → bridge arm Q4 → bridge arms Q5 and Q6 → simultaneously to the second winding L2, the sixth switch K6, and the third winding L3 → the seventh switch K7 → the negative terminal of the power supply CS, storing the electrical energy output by the power supply CS on the three-phase windings.

[0089] Step V2: After the first preset energy storage time, disconnect the lower bridge arm Q4 of the first bridge arm, connect the upper bridge arm Q1 of the first bridge arm, and close the two-stage switches K11 and K12 of the power battery to form the sixth energy conversion circuit. The stored electrical energy is superimposed with the electrical energy output by the power supply CS to boost the voltage. The current flows from the positive terminal of the power supply CS → the third switch K3 → the first winding L1 → the fourth open tube K4 → bridge arm Q1 → the positive switch K11 of the power battery E → the positive terminal of the power battery E → the negative terminal of the power battery E → the negative switch K12 of the power battery E → bridge arms Q5 and Q6 → simultaneously to the second winding L2, the sixth switch K6 and the third winding L3 → the seventh switch K7 → the negative terminal of the power supply CS to charge the power battery E.

[0090] Step V3: After charging the power battery E for a second preset time, proceed to step V1.

[0091] The above method forms a three-phase winding series-parallel boost charging energy conversion circuit to boost the power battery. During the boost charging process, the current direction of the three-phase windings is always the same, flowing towards the midpoint of the winding.

[0092] The above explanation pertains to boost charging. In actual charging, the power supply voltage may be higher than the battery voltage. In this case, the battery is charged at a reduced voltage. Reduced voltage charging differs slightly from boost charging. In the circuit structure of reduced voltage charging, the second terminal of the special winding is connected to the first terminal of the battery via a switch; the second terminal of the electronic control unit is connected to the second terminal of the tail switch via a switch located between the second terminal of the power supply and the multi-phase winding, with the second terminal of the tail switch connected to the second terminal of the power supply.

[0093] In the case of buck charging, multiple switches are configured to close or open based on a second signal, and multi-phase bridge arms are configured to turn on or off based on a second signal. During buck charging, the switch located at the second end of a special winding and the first pole of the power battery is always closed.

[0094] The multiphase windings are configured to combine the closed or open states of each switch and the on or off states of each phase bridge arm to form a multiphase winding parallel step-down charging energy conversion circuit, so that the electrical energy output by the power supply is stepped down and converted to charge the power battery.

[0095] Among these, the second signal is a signal that enables some of the switches among multiple switches to close, and the upper or lower bridge arm in the multi-phase bridge arm to conduct, so as to form an energy conversion circuit for multi-phase winding parallel step-down charging.

[0096] To better understand the structure of the buck charging described above, refer to... Figure 9 The diagram shows the structure of the step-down charging circuit. Figure 9 The image shown is a comprehensive representation. Figure 2 The provided circuit diagram for boost charging is followed by the circuit diagrams for buck charging. If only buck charging is required, the switches involved in boost charging can be omitted, and only the switches involved in buck charging can be retained. Figure 9 Zhongyu Figure 2 The same structure will not be repeated here; the difference is:

[0097] Figure 9 As shown, the second end of the first winding L1 is also connected to the first pole, i.e. the positive pole, of the power battery E through the tenth switch K10; the second pole of the electronic control unit is connected to the second end of the tail switch (i.e. the seventh switch K7) through the ninth switch K9.

[0098] If boost charging is not required, then Figure 9 The third switch K3, the seventh switch K7, and the fourth switch K4 can be omitted. Furthermore, if the seventh switch K7 is present, it is preferable that the second terminal of the ninth switch K9 is short-circuited to the second terminal of the seventh switch K7 before being connected to the negative terminal of the power supply CS. If it is directly connected to the negative terminal of the power supply CS, then during boost charging, the closing or opening of the ninth switch K9 must be synchronized with the closing or opening of the seventh switch K7, increasing control complexity. Therefore, it is preferable to short-circuit the second terminal of the seventh switch K7 before connecting it to the negative terminal of the power supply CS. However, if there are difficulties in wiring, it can also be directly connected to the negative terminal of the power supply CS.

[0099] In one embodiment of the present invention, buck charging includes buck charging where the voltage difference between the highest output voltage of the power supply and the highest permissible voltage of the power battery is greater than a preset threshold. This is because factors such as data transmission errors and measurement errors may cause the highest output voltage of the power supply to be higher than the highest permissible voltage of the power battery, but the voltage difference may be small, for example, less than 50V. In this case, buck charging is not necessary, and direct charging can be used directly without causing adverse damage to the power battery. Therefore, a preset threshold, such as 50V, is set. If the voltage difference between the highest output voltage of the power supply and the highest permissible voltage of the power battery is greater than 50V, buck charging is used; otherwise, direct charging can be used.

[0100] Reference Figure 10 The diagram shown illustrates the energy storage in the windings during the step-down charging process in the case of a multiphase winding series-parallel step-down charging energy conversion circuit. Figure 11 The diagram shows the release of stored energy from the windings during the step-down charging process in the case of a multiphase winding series-parallel step-down charging energy conversion circuit.

[0101] In buck charging mode, the controller CN controls the on / off state of the bridge arms of the electronic control unit and controls the closing / opening of multiple switches to alternately form the seventh and eighth energy conversion circuits. The seventh energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1, Q4, the second bridge arms Q2, Q5, and the third bridge arms Q3, Q6 of the electronic control unit, the power supply CS, and the power battery E. The eighth energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1, Q4, the second bridge arms Q2, Q5, and the third bridge arms Q3, Q6 of the electronic control unit, and the power supply CS. The current flowing through the first winding L1, the second winding L2, and the third winding L3 flows in the same direction. The following steps are repeatedly executed during the buck charging process:

[0102] Step X1: Close the first switch K1, the second switch K2, the fifth switch K5, the sixth switch K6, the ninth switch K9, the tenth switch K10, and the switch K12 corresponding to the second terminal of the power battery, and turn on all upper bridge arms Q1, Q2, and Q3. Disconnect the remaining switches and bridge arms, forming the seventh energy conversion circuit. The first winding L1, the second winding L2, and the third winding L3 form a parallel structure. Current flows from the positive terminal of the power supply CS → the first switch K1 → bridge arms Q1, Q2, and Q3 → simultaneously to the second switch K2, the first winding L1 and the second winding L2, the fifth switch K5 and the third winding L3, the sixth switch K6 → the tenth switch K10 → the positive terminal of the power battery E → the negative terminal of the power battery E → the negative terminal switch K12 of the power battery E → the ninth switch K9 → the negative terminal of the power supply CS, storing the electrical energy output by the power supply CS on the three-phase windings.

[0103] Step X2: After the first preset energy storage time, disconnect the first switch K1, the ninth switch K9, and all upper bridge arms Q1, Q2, and Q3 to form the eighth energy conversion circuit. The stored electrical energy is released through the freewheeling diodes of all lower bridge arms for voltage reduction. The current flows from the second terminal of the three-phase winding → the tenth switch K10 → the positive terminal of the power battery E → the negative terminal of the power battery E → the negative terminal switch K12 of the power battery E → the freewheeling diodes of each bridge arm Q4, Q5, and Q6 → simultaneously to the second switch K2, the first winding L1 and the second winding L2, the fifth switch K5 and the third winding L3, and the sixth switch K6, to perform voltage reduction charging for the power battery E. The formula for calculating the voltage reduction charging is: Uout = D * Uin, where Uout is the voltage of the power battery E, Uin is the voltage of the power supply CS, and D is the duty cycle of each transistor.

[0104] Step X3: After charging the power battery E for the second preset time, proceed to step X1.

[0105] The above method forms a three-phase winding parallel energy conversion circuit for step-down charging, which performs step-down charging for the power battery. During the step-down charging process, the current direction of the three-phase windings is always the same, flowing towards the midpoint of the winding.

[0106] It is understandable that, if it is a two-phase winding motor, the aforementioned seventh energy conversion circuit is formed by the first winding L1, the second winding L2, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, the power supply CS, and the power battery E; the eighth energy conversion circuit is formed by the first winding L1, the second winding L2, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, and the power supply CS; the current flows through the first winding L1 and the second winding L2 in the same direction. The specific closing and opening states of the switches and bridge arms, as well as the current flow direction, can be obtained through simple reasoning based on the aforementioned three-phase winding case, and will not be elaborated further.

[0107] For direct charging: as previously explained, it is carried out when the voltage difference between the highest output voltage of the power supply and the highest allowable voltage of the power battery is not greater than a preset threshold.

[0108] In the case of direct charging, multiple switches are configured to close or open based on a fourth signal, multi-phase bridge arms are configured to open based on the fourth signal, and multi-phase windings are configured not to participate in the charging process, forming an energy conversion circuit for direct charging so that the electrical energy output from the power supply can directly charge the power battery. The fourth signal is a signal that enables some of the multiple switches to close, thus forming the energy conversion circuit for direct charging. In other words, during direct charging, neither the windings nor the bridge arms participate in the charging process.

[0109] To better understand the structure of the direct charging described above, refer to... Figure 12 The diagram shown is of the direct charging circuit structure. Figure 12 The image shown is based on Figure 9 The provided circuit diagrams for boost and buck charging are equivalent to the direct charging circuit diagram. If only direct charging is required, the switches involved in boost and buck charging can be omitted, and only the switches involved in direct charging can be retained. Figure 12 Zhongyu Figure 9 The same structure will not be described again. The difference is that if only direct charging is used, only the first switch K1, the positive and negative switches of the power battery K11 and K12, and the ninth switch K9 need to be retained, and the other switches can be omitted. When the energy conversion circuit of the direct charging is formed, the direct charging process continues to execute: the first switch K1, the ninth switch K9, and the two-stage switches of the power battery K11 and K12 are closed, and the other switches and all bridge arms are disconnected. The first winding L1, the second winding L2, the third winding L3, and all bridge arms do not participate in the charging process, and the power supply CS directly charges the power battery E.

[0110] Reference Figure 13 The diagram illustrates the energy conversion circuit for direct charging. In direct charging mode, controller CN controls the closing or opening of multiple switches to form an eleventh energy conversion circuit. This eleventh energy conversion circuit is formed by the power supply CS and the power battery E. No current flows through the first winding L1, the second winding L2, or the third winding L3. In other words, in direct charging mode, neither the windings nor the bridge arms participate, and therefore there is no energy storage in the windings. The current in the eleventh energy conversion circuit flows from the positive terminal of the power supply CS → the first switch K1 → the positive switch K11 of the power battery E → the positive terminal of the power battery E → the negative terminal of the power battery E → the negative switch K12 of the power battery E → the ninth switch K9 → the negative terminal of the power supply CS.

[0111] The above explains the charging situation of power batteries. In actual charging, if the power battery is at a low temperature before or when preparing to charge, its internal resistance will be high due to its material properties. During the initial charging phase, some energy will be consumed to overcome this high internal resistance, causing the battery temperature to gradually rise. As the internal resistance decreases, the charging speed will slowly increase. For example, if the power battery is below 0°C when preparing to charge, its internal resistance will be high. During the initial charging phase, some of the current output from the power supply will not be used to charge the battery but will be consumed to overcome the high internal resistance. As the battery temperature gradually rises and its internal resistance gradually decreases, the power supply will output a normal current for charging, and the charging speed will slowly increase. This undoubtedly indirectly prolongs the charging time and increases the charging cost, requiring more time and more energy to complete the charging process.

[0112] Considering the aforementioned problems, in one embodiment of the present invention, after the vehicle establishes a connection with the power source, the vehicle first obtains the average temperature of the power battery. When it is determined that the power battery temperature is lower than a preset temperature, such as 0°C, the corresponding switch and bridge arm are first controlled to close, allowing the power battery to release energy to the windings. The windings then store energy and discharge it to the power battery, achieving self-heating of the power battery. The power battery generates heat due to the resistive heating effect, causing the battery temperature to rise and the internal resistance to decrease. Once the power battery temperature exceeds the preset temperature, self-heating ceases, and the vehicle prepares to begin charging, thereby reducing charging time and costs.

[0113] In the case of self-heating, multiple switches are configured to close or open based on a third signal, and multi-phase bridge arms are configured to be turned on or off based on a third signal. During the self-heating process, the switch located at the second end of the special winding and the first pole of the power battery is always closed.

[0114] The multiphase windings are configured to combine the closed or open states of each switch and the on or off states of each phase bridge arm to form a multiphase winding parallel self-heating energy conversion circuit, so that the electrical energy output by the power battery generates heat based on the resistance heating effect, thereby increasing the temperature of the power battery.

[0115] Among these, the third signal is a signal that enables some of the switches in the multiple switches to close, and the upper or lower bridge arm in the multiphase bridge arm to conduct, so as to form a multiphase winding parallel self-heating energy conversion circuit.

[0116] To better understand the self-heating structure described above, refer to... Figure 14 The diagram shown is of the self-heating circuit structure. Figure 14 The image shown is based on Figure 9 The provided circuit diagram for boost and buck charging includes a self-heating circuit diagram. If only self-heating is required, the switches involved in boost and buck charging can be omitted, and only the switches involved in self-heating can be retained. Figure 14 Zhongyu Figure 6 The same structure will not be repeated here; the difference is:

[0117] Figure 14 As shown, if buck-boost charging is not required, then Figure 14 The first switch K1, the third switch K3, the fourth switch K4, the seventh switch K7, and the ninth switch K9 can be omitted.

[0118] Reference Figure 15 The diagram shown illustrates the energy storage in the windings during the self-heating process in a multi-phase winding parallel self-heating energy conversion circuit. (Refer to...) Figure 16 The diagram shows the release of stored energy by the windings during the self-heating process in the case of a multiphase winding parallel self-heating energy conversion circuit.

[0119] In self-heating mode, the controller is used to control the bridge arm of the electronic control unit to be turned on or off, and to control the multiple switches to be turned on or off, so as to alternately form the ninth energy conversion circuit and the tenth energy conversion circuit;

[0120] The ninth energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1 and Q4, the second bridge arms Q2 and Q5, the third bridge arms Q3 and Q6 of the electronic control unit, and the power battery E; the tenth energy conversion circuit is formed by the first winding L1, the second winding L2, the third winding L3, the first bridge arms Q1 and Q4, the second bridge arms Q2 and Q5, the third bridge arms Q3 and Q6 of the electronic control unit, and the power battery E; the current flowing through the first winding L1, the second winding L2, and the third winding L3 is in the same direction. The following steps are repeatedly executed during the self-heating process:

[0121] Step Y1: Close the second switch K2, the fifth switch K5, the sixth switch K6, the tenth switch K10, and the negative switch K12 of the power battery E, and turn on all lower bridge arms Q4, Q5, and Q6. Disconnect the remaining switches and bridge arms, forming the ninth energy conversion circuit. The first winding L1, the second winding L2, and the third winding L3 form a parallel structure. Current flows from the positive terminal of the power battery E → the tenth switch K10 → simultaneously to the first winding L1, the second switch K2 and the fifth switch K5, the second winding L2 and the sixth switch K6, the third winding L3 → bridge arms Q4, Q5, and Q6 → the negative switch K12 of the power battery E → the negative terminal of the power battery E, storing the electrical energy output from the power battery E in the three-phase windings.

[0122] Step Y2: After the first preset energy storage time, disconnect all lower bridge arms Q4, Q5, and Q6 to form the tenth energy conversion circuit. The stored electrical energy is released through the freewheeling diodes of all upper bridge arms and flows to the power battery E. The current flows from the positive terminal of the power battery E → the tenth switch K10 → simultaneously to the first winding L1, the second switch K2 and the fifth switch K5, the second winding L2 and the sixth switch K6, the third winding L3 → the freewheeling diodes of each of the bridge arms Q1, Q2, and Q3 → the first capacitor C1 → the negative switch K12 of the power battery E → the negative terminal of the power battery E.

[0123] Step Y3: After heating the power battery E for a second preset time, proceed with step Y1.

[0124] The above method forms a three-phase winding parallel self-heating energy conversion circuit to self-heat the power battery. During the self-heating process, the current direction of the three-phase windings is always the same, and all currents flow out from the midpoint of the winding.

[0125] It is understandable that, if it is a two-phase winding motor, the aforementioned ninth energy conversion circuit is formed by the first winding L1, the second winding L2, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, and the power battery E; the tenth energy conversion circuit is formed by the first winding L1, the second winding L2, the first bridge arms Q1 and Q4 of the electronic control unit, the second bridge arms Q2 and Q5, and the power battery E; the current flows through the first winding L1 and the second winding L2 in the same direction. The specific closing and opening states of the switches and bridge arms, as well as the current flow direction, can be obtained through simple reasoning based on the aforementioned three-phase winding case, and will not be elaborated further.

[0126] The energy conversion circuit proposed in this invention utilizes multiple switches positioned between the multiphase windings and multiphase bridge arms, the power supply, and between the multiphase windings. By combining the closing or opening of these switches according to different states of the power battery, different structural forms of the multiphase windings are formed, resulting in different energy conversion circuits. For example, in the boost charging process, there are series, parallel, or series-parallel structures, corresponding to three different boost charging energy circuits; in the buck charging process, there is a parallel structure, and its buck charging energy circuit, etc. Furthermore, regardless of the structure of the multiphase windings, the current flowing through each phase winding follows either a first direction or a second direction. The first direction flows from the electronically controlled end to the non-electronically controlled end, and the second direction flows from the non-electronically controlled end to the electronically controlled end. This avoids current imbalance in the multiphase windings, improves stability during boost, buck charging, and self-heating, and significantly enhances the user's charging experience.

[0127] Based on the above-described energy conversion circuit, the present invention also provides an energy conversion control method, which is applied to the above-described energy conversion circuit. (Refer to...) Figure 17 The flowchart of the energy conversion control method shown includes:

[0128] Step 1701: Send control signals to multiple switches and electronic control units according to the state of the power battery, so that the multiple switches are closed or opened based on different energy conversion modes, thereby making the electronic control unit and multi-phase winding suitable for forming corresponding energy conversion circuits with the power supply and / or power battery in the energy conversion mode. When each energy conversion circuit is working, the current flowing through each phase winding is either in a first direction or a second direction. The first direction is from the electronic control terminal to the non-electronic control terminal, and the second direction is from the non-electronic control terminal to the electronic control terminal.

[0129] Optionally, control signals are sent to multiple switches and electronic control units respectively according to the state of the power battery, including:

[0130] If the power battery is in a state where the power battery temperature is lower than the preset temperature, a third signal is sent to multiple switches and electronic control units respectively. This third signal enables the electronic control unit and multiphase winding to form a self-heating energy conversion circuit with the power battery in self-heating mode.

[0131] Optionally, control signals are sent to multiple switches and electronic control units respectively according to the state of the power battery, including:

[0132] If the power battery is in a state where the power battery temperature is not lower than the preset temperature and it is in boost charging mode, then a first signal is sent to multiple switches and electronic control units respectively. The first signal enables the electronic control unit and the multiphase winding to form a boost charging energy conversion circuit with the power supply and / or the power battery in boost charging mode. The multiphase winding is formed in the form of series winding, parallel winding or series-parallel winding.

[0133] Optionally, control signals are sent to multiple switches and electronic control units respectively according to the state of the power battery, including:

[0134] If the power battery is in a state where the power battery temperature is not lower than the preset temperature and it is in buck charging mode, then a second signal is sent to multiple switches and electronic control units respectively. The second signal enables the electronic control unit and multiphase winding to form a buck charging energy conversion circuit with the power supply and / or power battery in buck charging mode.

[0135] Optionally, control signals are sent to multiple switches and electronic control units respectively according to the state of the power battery, including:

[0136] If the power battery is in a state where the power battery temperature is not lower than the preset temperature and it is in direct charging mode, then a fourth signal is sent to multiple switches respectively. The fourth signal causes the corresponding switch among the multiple switches to close, forming an energy conversion circuit for direct charging. The multiphase winding and multiphase bridge arm do not participate in direct charging.

[0137] The above energy conversion control methods combined Figure 18 The flowchart shown provides a better understanding. Figure 18 The following example illustrates the process using a preset temperature of 0℃ and a preset threshold of 50V. First, the device is connected to a power source. Then, communication with the power source is initiated. Next, it is determined whether the temperature of the vehicle's power battery (i.e., the battery itself) is below 0℃. If so, a first control signal is sent to the controller (which includes a control unit that controls the closing or opening of switches and a controller that controls the conduction and opening of bridge arms). This first control signal causes the controller to send a third signal to each switch and bridge arm to activate the battery self-heating mode, which is the aforementioned power battery state: self-heating.

[0138] If the vehicle's power battery temperature is not lower than 0°C, then it is determined whether the power supply voltage is lower than the power battery voltage. If the power supply voltage is lower than the power battery voltage, the power supply voltage and power (i.e., the output current of the charging cable) are obtained. Then, based on the actual situation (i.e., whether the voltage difference is greater than the boost amount, whether the output current is greater than the preset current, and whether the voltage difference is not greater than the preset boost amount and the output current is not greater than the preset current), a second control signal is sent to the controller (this second control signal causes the controller to send the first signal to each switch and bridge arm), switching between series, parallel, and series-parallel modes (i.e., the windings form a series structure, parallel structure, or series-parallel structure) to start the boost charging mode, which is the aforementioned power battery state: boost charging.

[0139] If the power supply voltage is not less than the power battery voltage, then it is determined whether the power supply voltage is 50V higher than the power battery voltage. If the power supply voltage is 50V higher than the power battery voltage, a third control signal is sent to the controller (this third control signal causes the controller to send a second signal to each switch and bridge arm) to start the buck charging mode, which is the aforementioned power battery state: buck charging.

[0140] If the power supply voltage is not 50V higher than the power battery voltage, a fourth control signal is sent to the controller (this fourth control signal causes the controller to send a fourth signal to each switch) to start the direct charging mode, which is the aforementioned power battery state: direct charging.

[0141] Based on the above-described energy conversion circuit, embodiments of the present invention also provide an electronic device, including one or more processors; and one or more machine-readable media storing instructions thereon, which, when executed by one or more processors, cause the electronic device to perform the energy conversion control method as described in step 1701.

[0142] Based on the above-described energy conversion circuit, this embodiment of the invention also provides a computer-readable storage medium, which stores a computer program that causes a processor to execute the energy conversion control method as described in step 1701.

[0143] Based on the above-described energy conversion circuit, this embodiment of the invention also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the energy conversion control method as described in step 1701.

[0144] Based on the energy conversion circuit described above, embodiments of the present invention also provide a vehicle that includes the energy conversion circuit described above.

[0145] In summary, the energy conversion circuit of the present invention includes: an electronic control unit, multi-phase windings, and multiple switches. The multi-phase windings are connected to each other, to the electronic control unit, and to the power supply via multiple switches.

[0146] Multiple switches are configured to be closed or open based on the state of the power battery; the multi-phase bridge arm in the electronic control unit is configured to be on or off based on the state of the power battery; the multi-phase winding is configured to combine the closed or open state of multiple switches and the on or off state of the multi-phase bridge arm to form different energy conversion circuits, and when each energy conversion circuit is working, the current flowing through each phase winding is in a first direction or a second direction. The first direction is from the electronic control terminal to the non-electronic control terminal, and the second direction is from the non-electronic control terminal to the electronic control terminal.

[0147] The energy conversion circuit provided in this embodiment utilizes multiple switches positioned between the multi-phase windings and multi-phase bridge arms, the power supply, and between the multi-phase windings. By combining the closing or opening of these switches according to different states of the power battery, different structural forms of the multi-phase windings are formed, resulting in different energy conversion circuits. For example, in the boost charging process, there are series, parallel, or series-parallel structures, corresponding to three different boost charging energy circuits; in the buck charging process, there is a parallel structure, and its buck charging energy circuit, etc. Furthermore, regardless of the structural form of the multi-phase windings, the direction of current flow through each phase winding is the same, thus avoiding current imbalance problems in the multi-phase windings, improving stability during boost, buck charging, and self-heating, and greatly enhancing the user's charging experience. The energy conversion circuit of this embodiment has high practicality.

[0148] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. An energy conversion circuit, characterized in that, The energy conversion circuit includes: an electronic control unit and a multiphase winding; The multiphase windings are connected to each other and to the electronic control unit through multiple switches. The multiple switches are configured to close or open based on different energy conversion modes, so that the electronic control unit and the multiphase windings are suitable for forming a corresponding energy conversion circuit with the power supply and / or power battery in the energy conversion mode. When each energy conversion circuit is working, the direction of the current flowing through each phase winding is either a first direction or a second direction. The first direction is from the electrically controlled end to the non-electrically controlled end, and the second direction is from the non-electrically controlled end to the electrically controlled end.

2. The energy conversion circuit according to claim 1, characterized in that, The multiphase winding includes: The first winding, the first end of the first winding is connected to the midpoint of the first bridge arm of the electronic control unit; The second winding, the first end of which is connected to the midpoint of the second bridge arm of the electronic control unit; The second end of the first winding and the second end of the second winding are connected to the midpoint of the winding.

3. The energy conversion circuit according to claim 2, characterized in that, include: The fifth switch has its first end connected to the second end of the first winding and its second end connected to the second end of the second winding.

4. The energy conversion circuit according to claim 3, characterized in that, Also includes: The second switch has its first end connected to the first end of the first winding and its second end connected to the midpoint of the first bridge arm of the electronic control unit. A third switch, wherein the first end of the third switch is adapted to be connected to a first power port, and the second end of the third switch is connected to the first end of the second switch; The fourth switch has its first end connected to the midpoint of the first bridge arm of the electronic control unit, and its second end connected to the first end of the fifth switch.

5. The energy conversion circuit according to claim 4, characterized in that, Also includes: The third winding has its first end connected to the midpoint of the third bridge arm of the electronic control unit, and its second end connected to the midpoint of the winding.

6. The energy conversion circuit according to claim 5, characterized in that, Also includes: A sixth switch, the first end of which is connected to the second end of the second winding, and the second end of which is connected to the second end of the third winding.

7. The energy conversion circuit according to claim 6, characterized in that, Also includes: The eighth switch, the first end of which is connected to the second end of the second winding and the first end of the sixth switch; The second end of the eighth switch is connected to the first end of the third winding.

8. The energy conversion circuit according to any one of claims 2-7, characterized in that, Also includes: A first switch, the first end of the first switch is connected to the first pole of the electronic control unit, and the second end of the first switch is adapted to be connected to a first power port; A ninth switch, the first end of which is connected to the second pole of the electronic control unit, and the second end of which is adapted to be connected to a second power port.

9. The energy conversion circuit according to claim 8, characterized in that, Also includes: The eleventh switch has its first end connected to the first pole of the electronic control unit, and its second end adapted to be connected to the positive pole of the power battery. The twelfth switch has its first end connected to the second terminal of the electronic control unit, and its second end is adapted to connect to the negative terminal of the power battery.

10. The energy conversion circuit according to any one of claims 2-7, characterized in that, Also includes: The tenth switch has its first end connected to the second end of the first winding, and its second end is adapted to connect to the positive terminal of the power battery.

11. The energy conversion circuit according to claim 10, characterized in that, Also includes: The seventh switch, the first end of which is connected to the second end of the third winding, and the second end of which is adapted to be connected to the second power port; The eleventh switch has its first end connected to the first pole of the electronic control unit, and its second end adapted to be connected to the positive pole of the power battery. A ninth switch, the first end of which is connected to the second pole of the electronic control unit, and the second end of which is adapted to be connected to a second power port.

12. The energy conversion circuit according to claim 10, characterized in that, Also includes: A first switch, the first end of which is connected to the first pole of the electronic control unit, and the second end of which is adapted to be connected to a first power port.

13. The energy conversion circuit according to claim 12, characterized in that, Also includes: The eleventh switch has its first end connected to the first pole of the electronic control unit, and its second end adapted to be connected to the positive pole of the power battery. The twelfth switch has its first end connected to the second terminal of the electronic control unit and its second end connected to the negative terminal of the power battery.

14. The energy conversion circuit according to claim 2, characterized in that, Each arm of the electronic control unit includes an upper arm and a lower arm. One end of the upper arm serves as the first stage of the electronic control unit, connecting to the first terminal of the power battery. One end of the lower arm serves as the second stage of the electronic control unit, connecting to the second terminal of the power battery. The other end of the upper arm is connected to the other end of the lower arm, serving as the midpoint of each arm.

15. The energy conversion circuit according to claim 2, characterized in that, The energy conversion control circuit also includes: a first capacitor and a second capacitor; The two ends of the first capacitor are respectively connected to the first and second terminals of the electronic control unit; The two ends of the second capacitor are connected to the first power port and the second power port, respectively.

16. An energy conversion control circuit, characterized in that, include: The energy conversion circuit according to any one of claims 1-15; A controller is connected to the electronic control unit and the plurality of switches, and is used to control the bridge arm of the electronic control unit to be turned on or off, and to control the plurality of switches to be turned on or off.

17. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion modes include: series boost charging and parallel boost charging; In series boost charging and parallel boost charging modes, the controller is used to control the bridge arm of the electronic control unit in the energy conversion circuit to be turned on or off, and to control multiple switches in the energy conversion circuit to be closed or opened, so as to alternately form the first energy conversion circuit and the second energy conversion circuit. The first energy conversion circuit is formed by the first winding and the second winding of the energy conversion circuit, the first bridge arm and the second bridge arm of the electronic control unit, and the power supply; the second energy conversion circuit is formed by the first winding and the second winding of the energy conversion circuit, the first bridge arm and the second bridge arm of the electronic control unit, the power supply, and the power battery; the direction of the current flowing through the first winding and the second winding is the same.

18. The energy conversion control circuit according to claim 17, characterized in that, In the series boost charging mode, the controller controls the third, fourth, sixth, and seventh switches in the energy conversion circuit to close, and controls the lower bridge arms of the first and second bridge arms to conduct, so that the first winding and the second winding are connected in series, and together with the lower bridge arms of the first and second bridge arms and the power supply, they form the first energy conversion circuit. The controller controls the closing of the third, fourth, sixth, seventh, eleventh, and twelfth switches in the energy conversion circuit, and controls the upper bridge arm of the first bridge arm and the lower bridge arm of the second bridge arm to conduct, so that the first winding and the second winding are connected in series, and together with the upper bridge arm of the first bridge arm, the lower bridge arm of the second bridge arm, the power supply, and the power battery, they form the second energy conversion circuit.

19. The energy conversion control circuit according to claim 17, characterized in that, In the parallel boost charging mode, the controller controls the first switch, second switch, fifth switch, sixth switch and seventh switch in the energy conversion circuit to close, and controls the upper bridge arm of the first bridge arm and the second bridge arm to conduct, so that the first winding and the second winding are connected in parallel, and together with the upper bridge arm of the first bridge arm and the second bridge arm and the power supply, they form the first energy conversion circuit. In the parallel boost charging mode, the controller controls the first, second, fifth, sixth, seventh, eleventh, and twelfth switches in the energy conversion circuit to close, and controls the lower bridge arms of the first and second bridge arms to conduct, so that the first winding and the second winding are connected in parallel, forming the second energy conversion circuit together with the lower bridge arms of the first and second bridge arms, the power supply, and the power battery.

20. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion mode includes: series boost charging; In the series boost charging mode, the controller is used to control the bridge arm of the electronic control unit in the energy conversion circuit to be turned on or off, and to control multiple switches in the energy conversion circuit to be closed or opened, so as to alternately form the third energy conversion circuit and the fourth energy conversion circuit; The third energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm and second bridge arm of the electronic control unit, and the power supply; the fourth energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm and second bridge arm of the electronic control unit, the power supply, and the power battery; the direction of current flowing through the first winding, second winding, and third winding is the same.

21. The energy conversion control circuit according to claim 20, characterized in that, In the series boost charging mode, the controller controls the third, fourth, seventh, and eighth switches in the energy conversion circuit to close, and controls the lower bridge arms of the first and second bridge arms to conduct, so that the first winding, the second winding, and the third winding are connected in series, forming the third energy conversion circuit together with the lower bridge arms of the first and second bridge arms and the power supply. The controller controls the closing of the third, fourth, seventh, eighth, eleventh, and twelfth switches in the energy conversion circuit, and controls the upper bridge arm of the first bridge arm and the lower bridge arm of the second bridge arm to conduct, so that the first winding, the second winding, and the third winding are connected in series, and together with the upper bridge arm of the first bridge arm, the lower bridge arm of the second bridge arm, the power supply, and the power battery, they form the fourth energy conversion circuit.

22. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion mode includes: parallel boost charging; In the parallel boost charging mode, the controller is used to control the bridge arm of the electronic control unit in the energy conversion circuit to be turned on or off, and to control multiple switches in the energy conversion circuit to be closed or opened, so as to alternately form the third energy conversion circuit and the fourth energy conversion circuit; The third energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm, second bridge arm, and third bridge arm of the electronic control unit, and the power supply; the fourth energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm, second bridge arm, and third bridge arm of the electronic control unit, the power supply, and the power battery; the direction of current flowing through the first winding, second winding, and third winding is the same.

23. The energy conversion control circuit according to claim 22, characterized in that, In the parallel boost charging mode, the controller controls the first switch, second switch, fifth switch, sixth switch, and seventh switch in the energy conversion circuit to close, and controls the upper bridge arm of the first bridge arm, second bridge arm, and third bridge arm to conduct, so that the first winding, second winding, and third winding are connected in parallel, and together with the upper bridge arm of the first bridge arm, second bridge arm, and third bridge arm and the power supply, they form the third energy conversion circuit; The controller controls the first, second, fifth, sixth, seventh, eleventh, and twelfth switches in the energy conversion circuit to close, and controls the lower bridge arms of the first, second, and third bridge arms to conduct, so that the first, second, and third windings are connected in parallel, and together with the lower bridge arms of the first, second, and third bridge arms, the power supply, and the power battery, they form the fourth energy conversion circuit.

24. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion mode includes: series-parallel boost charging; In the series-parallel boost charging mode, the controller is used to control the bridge arm of the electronic control unit in the energy conversion circuit to be turned on or off, and to control multiple switches in the energy conversion circuit to be closed or opened, so as to alternately form the fifth energy conversion circuit and the sixth energy conversion circuit; The fifth energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm, second bridge arm, and third bridge arm of the electronic control unit, and the power supply; the sixth energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm, second bridge arm, and third bridge arm of the electronic control unit, the power supply, and the power battery; the direction of current flowing through the first winding, second winding, and third winding is the same.

25. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion mode includes: buck charging; In buck charging mode, the controller is used to control the bridge arm of the electronic control unit in the energy conversion circuit to be turned on or off, and to control multiple switches in the energy conversion circuit to be closed or opened, so as to alternately form the seventh energy conversion circuit and the eighth energy conversion circuit; The seventh energy conversion circuit is formed by the first winding and the second winding of the energy conversion circuit, the first bridge arm and the second bridge arm of the electronic control unit, the power supply and the power battery; the eighth energy conversion circuit is formed by the first winding and the second winding of the energy conversion circuit, the first bridge arm and the second bridge arm of the electronic control unit and the power supply; the direction of the current flowing through the first winding and the second winding is the same.

26. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion mode includes: buck charging; In buck charging mode, the controller is used to control the bridge arm of the electronic control unit in the energy conversion circuit to be turned on or off, and to control multiple switches in the energy conversion circuit to be closed or opened, so as to alternately form the seventh energy conversion circuit and the eighth energy conversion circuit; The seventh energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm, second bridge arm, and third bridge arm of the electronic control unit, together with the power supply and the power battery; the eighth energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm, second bridge arm, and third bridge arm of the electronic control unit, together with the power supply; the direction of current flowing through the first winding, the second winding, and the third winding is the same.

27. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion mode includes: self-heating; In self-heating mode, the controller is used to control the bridge arm of the electronic control unit in the energy conversion circuit to be turned on or off, and to control multiple switches in the energy conversion circuit to be closed or opened, so as to alternately form the ninth energy conversion circuit and the tenth energy conversion circuit; The ninth energy conversion circuit is formed by the first winding, the second winding, the first bridge arm and the second bridge arm of the electronic control unit, and the power battery in the energy conversion circuit; the tenth energy conversion circuit is formed by the first winding, the second winding, the first bridge arm and the second bridge arm of the electronic control unit, and the power battery in the energy conversion circuit; the direction of the current flowing through the first winding and the second winding is the same.

28. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion mode includes: self-heating; In self-heating mode, the controller is used to control the bridge arm of the electronic control unit in the energy conversion circuit to be turned on or off, and to control multiple switches in the energy conversion circuit to be closed or opened, so as to alternately form the ninth energy conversion circuit and the tenth energy conversion circuit; The ninth energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm, second bridge arm, and third bridge arm of the electronic control unit, and the power battery; the tenth energy conversion circuit is formed by the first winding, second winding, and third winding of the energy conversion circuit, the first bridge arm, second bridge arm, and third bridge arm of the electronic control unit, and the power battery; the direction of current flowing through the first winding, second winding, and third winding is the same.

29. The energy conversion control circuit according to claim 16, characterized in that, The energy conversion mode includes: direct charging; In direct charging mode, the controller is used to control the closing or opening of multiple switches in the energy conversion circuit to form an eleventh energy conversion loop; The eleventh energy conversion circuit is formed by the power source and the power battery; no current flows through the first winding, the second winding, and the third winding.

30. An energy conversion control method, applied to the energy conversion circuit according to any one of claims 1-15, characterized in that, include: Control signals are sent to multiple switches and electronic control units in the energy conversion circuit according to the state of the power battery, so that the multiple switches are closed or opened according to different energy conversion modes. This makes the electronic control unit and the multi-phase winding suitable for forming a corresponding energy conversion circuit with the power supply and / or power battery in the energy conversion mode. When each energy conversion circuit is working, the direction of the current flowing through each phase winding is the same, flowing to the midpoint of the multi-phase winding or flowing out from the midpoint of the winding.

31. The energy conversion control method according to claim 30, characterized in that, Based on the power battery status, control signals are sent to the multiple switches and the electronic control unit respectively, including: When the power battery is in a state where its temperature is lower than a preset temperature, a third signal is sent to the multiple switches and the electronic control unit respectively. This third signal enables the electronic control unit and the multiphase winding to form a self-heating energy conversion circuit with the power battery in a self-heating mode.

32. The energy conversion control method according to claim 30, characterized in that, Based on the power battery status, control signals are sent to the multiple switches and the electronic control unit respectively, including: The power battery is in a state where the power battery temperature is not lower than the preset temperature and it is in boost charging mode. A first signal is sent to the multiple switches and the electronic control unit respectively. The first signal enables the electronic control unit and the multiphase winding to form a boost charging energy conversion circuit with the power supply and / or the power battery in boost charging mode. The multiphase winding is formed in the form of series winding, parallel winding or series-parallel winding.

33. The energy conversion control method according to claim 30, characterized in that, Based on the power battery status, control signals are sent to the multiple switches and the electronic control unit respectively, including: The power battery is in a state where the power battery temperature is not lower than the preset temperature and it is in buck charging mode. A second signal is sent to the multiple switches and the electronic control unit respectively. The second signal enables the electronic control unit and the multiphase winding to form a buck charging energy conversion circuit with the power supply and / or the power battery in buck charging mode.

34. The energy conversion control method according to claim 30, characterized in that, Based on the power battery status, control signals are sent to the multiple switches and the electronic control unit respectively, including: The power battery is in a state where the power battery temperature is not lower than the preset temperature and it is in direct charging mode. A fourth signal is sent to each of the multiple switches, and the fourth signal causes the corresponding switch among the multiple switches to close, forming a direct charging energy conversion circuit.

35. A computer-readable storage medium, characterized in that, The stored computer program causes the processor to execute the energy conversion control method as described in any one of claims 30 to 34.

36. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the energy conversion control method according to any one of claims 30 to 34.

37. A vehicle, characterized in that, The vehicle includes the energy conversion circuit as described in any one of claims 1-15.

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