Boost charging method and device, storage medium and computer program

Abstract

The invention provides a boost charging method and device, a storage medium and a computer program, and relates to the technical field of vehicle charging. The method comprises the steps that when the electric drive system is in a charging mode, the output current of a charging pile is acquired; the motor controller is selectively controlled to work in a first boost charging mode or a second boost charging mode according to the output current, and the charging efficiency of the electric drive system in the second boost charging mode is larger than that of the electric drive system in the first boost charging mode. The boost charging method provided by the invention can reduce system loss and temperature rise, prolong the service life of a silicon carbide device in a motor controller, improve the operation reliability of an electric drive system and improve the reliability of the electric drive system through switching of boost charging modes on the basis of meeting the compatibility requirement of a high-voltage platform vehicle type and a low-voltage charging pile. And the overall charging efficiency of the vehicle is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle charging technology, and in particular to a boost charging method, apparatus, storage medium and computer program. Background Technology

[0002] With the increasing use of high-voltage electrical platforms in electric vehicles, more and more models are equipped with batteries of 800 volts (V) and above. To achieve compatibility with mainstream low-voltage charging stations (500V / 750V charging stations), related technologies all employ boost charging technology based on the motor drive system. Against this backdrop, the power module of the motor controller has evolved from the traditional 400V platform Insulated-Gate Bipolar Transistor (IGBT) module to a silicon carbide (SiC) module. This fully leverages the technological advantages of SiC devices—high-speed switching frequency, high thermal conductivity, and low turn-on loss—to meet the demands of high-voltage charging.

[0003] In the existing solution, the motor controller relies on the freewheeling diode of the upper bridge arm to charge the power battery during the boost charging process. This results in a significant increase in the temperature of the motor controller system, increased losses, accelerated aging of SiC devices, shortened lifespan, reduced reliability of the electric drive system, and also extended charging time and reduced charging efficiency. Summary of the Invention

[0004] This application provides a boost charging method, apparatus, storage medium, and computer program, aiming to solve the problems in existing boost charging methods, such as increased losses due to heat generation in the electric drive system, reduced system reliability, shortened service life, and low charging efficiency.

[0005] In a first aspect, a boost charging method is provided, applied to an electric drive system. The electric drive system includes a motor and a motor controller. The motor is connected to a charging pile and the motor controller, and the motor controller is connected to a power battery. The boost charging method includes: acquiring the output current of the charging pile when the electric drive system is in charging mode; selectively controlling the motor controller to operate in a first boost charging mode or a second boost charging mode according to the output current, wherein the charging efficiency of the electric drive system in the second boost charging mode is greater than the charging efficiency of the electric drive system in the first boost charging mode.

[0006] By employing the methods described above, the boost charging method provided in this application, in charging mode, directly reduces the overall loss and temperature rise of the electric drive system during boost charging by acquiring the output current signal of the charging pile and selectively switching different boost charging modes based on the current magnitude. The reduction in overall system loss directly reduces heat generation, thereby effectively controlling the temperature rise of the motor controller and improving the vehicle's charging efficiency. Furthermore, the effective reduction in loss and temperature rise alleviates the thermal and electrical stresses applied to the switching devices, resulting in a more temperate operating temperature environment. Therefore, it slows down the aging rate of the switching device materials in the motor controller, extending their service life and further improving the operational reliability of the electric drive system.

[0007] In conjunction with the first aspect, in some possible implementations, the above-mentioned selective control of the motor controller to operate in a first boost charging mode or a second boost charging mode based on the output current includes: controlling the motor controller to operate in the first boost charging mode when the output current is less than or equal to a first current threshold; and controlling the motor controller to operate in the second boost charging mode when the output current is greater than the first current threshold.

[0008] By employing the above method, the boost charging method provided in this application prioritizes the first boost charging mode when the output current of the charging pile is under low current conditions. This is achieved by using a critical value based on the intermittent operation of the three-phase inductor of the motor and a preset first current threshold based on the electrical characteristics of the SiC MOSFET. This avoids problems such as control algorithm failure caused by battery current backflow, system voltage fluctuations, increased losses due to MOSFET overcurrent, and reverse energy surges, thus ensuring the safety and stability of the vehicle charging process. When the output current of the charging pile exceeds the first current threshold, the method switches to a second boost charging mode to achieve energy transfer with lower losses, reducing system temperature rise, minimizing aging of silicon carbide devices, and improving charging efficiency and the reliability of the electric drive system.

[0009] In combination with the first aspect and the above implementation, in some possible implementations, the above-mentioned control of the motor controller to operate in the second boost charging mode when the output current is greater than the first current threshold includes: controlling the upper bridge switch and the lower bridge switch in the multiple bridge arms of the motor controller to conduct alternately; the power energy of the charging pile charges the power battery through the conduction path of the upper bridge switch.

[0010] In the boost charging method provided in this application, the control module first outputs a high-level signal to the gate of the lower bridge switch, driving the MOSFET channel in the lower bridge switch to conduct, allowing the three-phase inductors of the motor to store energy normally. When the lower bridge pulse is low, i.e., the MOSFET channel in the lower bridge switch is turned off, the control module outputs a high-level signal to the gate of the upper bridge switch, causing the MOSFET channel in the upper bridge switch to conduct. At this time, the energy stored in the three-phase inductors of the motor no longer depends on the freewheeling diode in the upper bridge switch, but instead forms an energy transfer path through the MOSFET channel in the upper bridge switch. The on-resistance of the MOSFET channel is much smaller than that of the freewheeling diode. That is, compared to the body diode freewheeling which always relies on a high on-state voltage drop, this step uses an optimized active switching mode to form a lower-loss current path, ensuring fast and low-loss energy transfer under high-current conditions, achieving a stable boost charging process, and improving the vehicle's charging efficiency.

[0011] In conjunction with the first aspect and the above implementation methods, in some possible implementation methods, the upper bridge switch and the lower bridge switch in the multiple bridge arms of the above-mentioned motor controller are alternately turned on, including: outputting a first pulse signal to the upper bridge switch and a second pulse signal to the lower bridge switch; the upper bridge switch turns on or off in response to the first pulse signal, and the lower bridge switch turns on or off in response to the second pulse signal; after the upper bridge switch switches from the on state to the off state, a first dead time is passed before the lower bridge switch is allowed to turn on; after the lower bridge switch switches from the on state to the off state, a second dead time is passed before the upper bridge switch is allowed to turn on.

[0012] By using the above method, the boost charging method provided in this application effectively avoids the situation where the lower bridge switch is turned on when the upper bridge switch is not completely turned off, or the upper bridge switch is turned on when the lower bridge switch is not completely turned off. The other switch is turned on only after the upper or lower bridge switch is completely turned off, thus avoiding the short circuit risk of direct connection between the upper and lower bridge switches. This ensures the operational safety and stability of the motor controller bridge arm circuit and provides a stable and reliable circuit environment for the low loss and high charging efficiency of the second boost charging mode, further ensuring the operational reliability of the electric drive system under boost charging.

[0013] In combination with the first aspect and the above implementation, in some possible implementations, before the first pulse signal is output to the upper bridge switch, the method further includes: the motor controller sending a target pulse request signal to the controller; the controller generating a first pulse signal and a second pulse signal corresponding to the target duty cycle based on the target pulse request signal.

[0014] Using the above method, the boost charging method provided in this application generates a target pulse request signal according to the charging demand by the motor controller and sends it to the controller. Based on the signal and the preset duty cycle adjustment rules, the controller generates a first pulse signal and a second pulse signal with a target duty cycle to precisely control the conduction time of the upper and lower bridge switches, thereby ensuring the stability and efficiency of the vehicle's boost charging process.

[0015] In conjunction with the first aspect, in some possible implementations, controlling the motor controller to operate in the first boost charging mode when the output current is less than the first current threshold includes: controlling the upper bridge switch in the multiple bridge arms of the motor controller to turn off, and controlling the lower bridge switch to turn on intermittently; the power energy of the charging pile is used to charge the power battery through the freewheeling path of the upper bridge switch.

[0016] Using the above method, when the output current is less than or equal to a first current threshold, the boost charging method provided in this application immediately outputs a control command for the first boost charging mode, continuously outputting pulse signals only to the gate of the lower bridge switch. These pulse signals drive the channel of the MOSFET in the lower bridge switch to conduct stably, allowing the three-phase inductance of the motor to form a closed loop with the charging pile through the lower bridge arm. Current flows through the three-phase inductance and stores energy in the form of magnetic field energy. Simultaneously, the control module does not output pulse signals to the gate of the upper bridge switch, and the channel of the MOSFET in the upper bridge arm remains off. When both the lower and upper bridge pulses are low, the magnetic field energy stored in the three-phase inductance cannot be suddenly interrupted; it can only form a freewheeling path through the freewheeling diode inside the MOSFET in the upper bridge switch. Electrical energy is transferred to the power battery through the freewheeling diode in the upper bridge switch, achieving stable boost charging of the vehicle under low current conditions.

[0017] In conjunction with the first aspect, in some possible implementations, before controlling the motor controller to operate in the first boost charging mode when the output current is less than or equal to the first current threshold, the method further includes: determining whether the output current is less than or equal to the second current threshold, wherein the second current threshold is less than the first current threshold; if it is determined that the output current is less than or equal to the second current threshold, controlling the motor controller to operate in the first boost charging mode; if it is determined that the output current is greater than the second current threshold, determining again whether the output current is less than or equal to the first current threshold.

[0018] By employing the above method, the boost charging method provided in this application first determines whether the output current is less than or equal to a second current threshold, and then determines whether it is less than a first current threshold when it is greater than the second current threshold. This establishes a hysteresis interval between the first and second current thresholds. On one hand, it avoids frequent switching of boost charging modes caused by fluctuations in the output current around a single threshold, preventing damage to switching devices due to excessive switching frequency. On the other hand, it covers the risks when the output current is in a transitional operating condition, ensuring that the second boost charging mode is only switched to when the output current stably exceeds the first current threshold during the rising phase, and the first boost charging mode is only switched back to during the falling phase when the current drops below the second current threshold. This ensures the stability, safety, and efficiency of the vehicle during the boost charging process.

[0019] Secondly, a boost charging device is provided, comprising: an acquisition module, a determination module, and a control module. The acquisition module acquires the output current of the charging pile when the electric drive system is operating in charging mode. The determination module determines, based on the output current, whether the motor controller is operating in a first boost charging mode or a second boost charging mode, wherein, in the second boost charging mode, the charging efficiency of the electric drive system is greater than the charging efficiency in the first boost charging mode. The control module, when determining that the motor controller is operating in the first boost charging mode, controls the upper bridge switch in a plurality of bridge arms of the motor controller to be continuously turned off and controls the lower bridge switch to be intermittently turned on, so that the output current charges the power battery through the freewheeling path of the upper bridge switch; when determining that the motor controller is operating in the second boost charging mode, controls the upper bridge switch and the lower bridge switch in a plurality of bridge arms of the motor controller to be alternately turned on, so that the electrical energy of the charging pile charges the power battery through the conducting path of the upper bridge switch.

[0020] The aforementioned modules cooperate to enable the boost charging device to perform the boost charging function described in the first aspect of the method design. These functions can be implemented in hardware or by hardware executing corresponding software. The hardware or software includes one or more sub-modules corresponding to the aforementioned functions.

[0021] Thirdly, a computer-readable storage medium is provided, which stores computer-executable instructions that, when executed by a processor, are used to implement the boost charging method in the first aspect or any possible implementation thereof.

[0022] Fourthly, embodiments of this application provide a chip system including one or more processors and may also include a memory. The processors are used to retrieve and execute instructions stored in the memory, causing the boost charging method in any of the first to third aspects or any possible implementation thereof to be executed. This chip system may consist of a single chip or may include multiple chips and other discrete devices, enabling memory controllers, interface expansion circuits, etc., to work collaboratively.

[0023] The chip system may include input circuits or interfaces for transmitting information or data, and output circuits or interfaces for receiving information or data.

[0024] Fifthly, a computer program product is provided, comprising: a computer program (also referred to as code or instructions), which, when executed, causes the computer to perform the boost charging method in any possible implementation of any of the above aspects. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a circuit structure for an existing boost charging application scenario provided in an embodiment of this application; Figure 2 This is a schematic diagram of a pulse signal for an example of a conventional charging process provided in an embodiment of this application; Figure 3 This is a schematic diagram of the circuit flow of an example pre-charge process provided in an embodiment of this application; Figure 4 This is a schematic diagram of the circuit flow of an example of a conventional charging process provided in an embodiment of this application; Figure 5 This is a schematic block diagram of an example boost charging device provided in an embodiment of this application; Figure 6 This is a schematic flowchart illustrating an example of a boost charging method provided in an embodiment of this application; Figure 7 This is a schematic flowchart illustrating another example of a boost charging method provided in the embodiments of this application; Figure 8 This is a schematic diagram of a pulse signal during a charging process provided in an embodiment of this application; Figure 9 This is a schematic flowchart illustrating another example of a boost charging method provided in the embodiments of this application; Figure 10 This is a line graph illustrating the relationship between output current and charging efficiency provided in an embodiment of this application. Figure 11 This is a schematic block diagram of an example of a boost charging device provided in the embodiments of this application. Detailed Implementation

[0026] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0027] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] With the rapid development of the electric vehicle industry, high-voltage vehicle electrical platforms have become a core development trend, with an increasing number of models equipped with 800V and higher voltage-level power batteries. Equipping vehicles with high-voltage platforms not only improves their power performance but also adapts to high-power charging demands, significantly optimizing the user's charging experience. However, current mainstream charging stations still primarily use low-voltage specifications such as 500V and 750V. To ensure compatibility between high-voltage platform vehicles and existing charging stations, related technologies generally adopt boost charging technology based on the motor drive system. By reusing the motor controller and the motor's three-phase inductors, the function of boost charging for vehicles can be achieved without the need for an additional independent boost module, effectively controlling overall vehicle cost and space occupation.

[0030] Against this backdrop, the power modules of motor controllers are gradually being replaced by silicon carbide (SiC) modules, which are widely used in traditional 400V platforms. This is because SiC devices have significant advantages such as higher switching frequencies, higher thermal conductivity, and lower turn-on losses. Therefore, SiC devices can better meet the high-power, low-loss requirements of high-voltage charging scenarios, ensuring the stability and safety of the vehicle's boost charging process.

[0031] Figure 1 This is a schematic diagram of a circuit structure for an existing boost charging application scenario provided in an embodiment of this application.

[0032] like Figure 1 As shown, existing boost charging circuits are used in electric drive systems, which include a motor and a motor controller. The motor is connected to the charging station and the motor controller, which is in turn connected to the HV battery. The motor controller includes an H-bridge circuit with three upper and three lower arms. Both upper and lower arms utilize SiC devices, specifically metal-oxide-semiconductor field-effect transistors (MOSFETs).

[0033] Specifically, the upper bridge switch includes a first MOSFET Q1, a second MOSFET Q2, and a third MOSFET Q3, while the lower bridge switch includes a fourth MOSFET Q4, a fifth MOSFET Q5, and a sixth MOSFET Q6.

[0034] It should be understood that all SiC MOSFETs contain a freewheeling diode within their internal structure. This freewheeling diode is an inherent body diode within the MOSFET, also known as a parasitic diode or body diode, formed due to the device's physical structure and manufacturing process. Therefore, the internal structure of a SiC MOSFET exhibits electrical characteristics of a unidirectional diode. From a working principle perspective, the anode of this freewheeling diode corresponds to the source of the SiC MOSFET, and the cathode corresponds to the drain of the SiC MOSFET. Its conduction direction is opposite to the conduction direction of the MOSFET channel. Therefore, this freewheeling diode provides a continuous path for current flow in the circuit when the MOSFET channel is in the off state, which is represented as a freewheeling path.

[0035] It should be understood that the circuit structure diagrams for the boost charging application scenarios in this application all use N-channel SiC MOSFETs, but P-channel SiC MOSFETs can also be used. This application does not limit the choice of MOSFET. Accordingly, selecting different channel types of SiC MOSFETs as switches in the H-bridge circuit requires corresponding changes to the circuit connection method of the MOSFETs, which will not be elaborated further in this application.

[0036] Before boost charging, the second relay K1 and the fifth relay K4 are closed, forming the electrical circuit between the charging pile, the electric drive system, and the HV Battery. At this time, the gate control signals of the upper and lower bridge switches are as follows: Figure 2 As shown, the upper bridge pulse remains at a stable low level, while the lower bridge pulse presents a single pulse signal.

[0037] During this stage, when the lower bridge pulse is high, the motor controller applies control pulses only to the gates of the fourth MOSFET Q4, fifth MOSFET Q5, and sixth MOSFET Q6 of the lower bridge switch, causing the channels of the lower bridge MOSFETs to conduct. However, the gates of the first MOSFET Q1, second MOSFET Q2, and third MOSFET Q3 of the upper bridge switch remain off because there is no valid control signal input from the upper bridge pulse. The three-phase inductance of the motor forms a circuit with the negative terminal of the charging pile through the fourth MOSFET Q4, fifth MOSFET Q5, and sixth MOSFET Q6.

[0038] At this time, the current path is as follows Figure 3 As shown, the current flows from the charging pile through the fifth relay K4 to the drain of the fourth MOSFET Q4, the fifth MOSFET Q5, and the sixth MOSFET Q6. It then flows through the channel formed by the conduction of the MOSFETs in the lower bridge switch to the source of the MOSFETs, and stores the electrical energy in the three-phase inductance of the motor.

[0039] After the high-level output of the lower bridge pulse ends, the motor controller stops outputting control pulses to the gates of the fourth MOSFET Q4, fifth MOSFET Q5, and sixth MOSFET Q6 of the lower bridge switch. The channels of the MOSFETs in the lower bridge switch are turned off, and the energy stored in the three-phase inductors cannot change abruptly. At this time, the upper bridge pulse remains in its original stable low-level state, and the channels of the first MOSFET Q1, second MOSFET Q2, and third MOSFET Q3 of the upper bridge switch remain in the off state. Therefore, the energy stored in the three-phase inductors can only form a freewheeling path through the freewheeling diodes inside the MOSFETs in the upper bridge switch.

[0040] At this time, the current path is as follows Figure 4As shown, current flows from the three-phase inductance of the motor through the sources of the first MOSFET Q1, the second MOSFET Q2, and the third MOSFET Q3, through the freewheeling diode to the drain of the MOSFET, and then through the third relay K2 to the high-voltage battery HV Battery. This allows the electrical energy input from the charging pile to be superimposed with the electrical energy released from the three-phase inductance of the motor, and then used to charge the high-voltage battery HV Battery through the freewheeling diode in the upper bridge arm.

[0041] Therefore, in the current boost charging process, the MOSFET in the upper bridge switch remains unconducted due to the lack of an effective control signal from the upper bridge pulse, relying solely on the freewheeling diode to form an energy transfer path. Because the freewheeling diode has inherent reverse recovery losses, which are particularly severe under high-voltage charging conditions, this directly leads to a significant temperature rise in the motor controller system and an increase in overall energy consumption. Such prolonged high losses and temperature rise also accelerate the aging of silicon carbide devices, shortening their lifespan and thus reducing the operational reliability of the entire electric drive system. Simultaneously, the increased energy loss indirectly prolongs the charging time and reduces charging efficiency.

[0042] Therefore, this application provides a boost charging method, apparatus, storage medium, and computer program. This boost charging method can reduce system losses and temperature rise, extend the service life of silicon carbide devices in the motor controller, and improve the operational reliability of the electric drive system by switching boost charging modes, while meeting the compatibility requirements of high-voltage platform vehicles and low-voltage charging piles, thereby improving the overall charging efficiency of the vehicle.

[0043] The boost charging method, apparatus, storage medium, and computer program provided in this application will be described exemplarily below with reference to the accompanying drawings.

[0044] Figure 5 This is a schematic block diagram of an example boost charging device provided in an embodiment of this application.

[0045] This application provides a boost charging device 500, which can be installed on the vehicle's motor controller. This device can boost the electrical energy output from a low-voltage charging pile to charge the vehicle's power battery. Figure 5 As shown, the device is equipped with an acquisition module 501, a determination module 502, and a control module 503. Through the coordinated operation of these modules, the device enables stable and compatible charging of high-voltage platform vehicles and low-voltage charging piles, while reducing temperature rise and losses during charging, and improving charging efficiency and the operational reliability of the electric drive system.

[0046] In one example Figure 6 This is a schematic flowchart illustrating an example of a boost charging method provided in an embodiment of this application.

[0047] To address the problems of significant temperature rise, high losses, low charging efficiency, and decreased reliability in existing boost charging methods for electric drive systems, this application provides a boost charging method applicable to... Figure 1 The boost charging circuit shown is exemplary, such as... Figure 6 As shown, the method 600 includes S601 and S602.

[0048] This method 600 can be applied to, but is not limited to, methods such as... Figure 5 The boost charging device shown, based on the coordinated operation of the acquisition module 501, the determination module 502, and the control module 503, adapts to the charging conditions and achieves precise switching of the boost charging mode. S601 and S602 are described in detail below.

[0049] S601 acquires the output current of the charging pile when the electric drive system is in charging mode.

[0050] In this example, the acquisition module can be a current sensor connected in series in the connection circuit between the charging pile and the electric drive system to collect the output current of the charging pile in real time. This application does not limit this. The acquisition module collects the output current of the charging pile and can also filter, amplify, and calibrate the original current signal to remove irrelevant noise caused by electromagnetic interference, convert it into a digital signal that the motor controller can recognize, obtain an accurate actual value of the charging pile output current, and synchronize this current data to the determination module in real time.

[0051] S602 selectively controls the motor controller to operate in a first boost charging mode or a second boost charging mode based on the output current, wherein the charging efficiency of the electric drive system in the second boost charging mode is greater than that in the first boost charging mode.

[0052] In this example, after the determination module receives the output current value of the charging pile collected by the acquisition module, it will analyze and judge the current signal, and select the corresponding boost charging mode based on the different ranges of the current magnitude.

[0053] When the module determines that the output current is small, it controls the motor controller to operate in the first boost charging mode and adjusts the internal switching devices to achieve boost conversion.

[0054] When the module determines that the output current is large, it controls the motor controller to operate in the second boost charging mode. This involves switching the boost charging strategy and adjusting the drive parameters of the internal switching devices to reduce their on-resistance and switching losses. The reduced on-resistance and switching losses significantly decrease heat generation within the motor controller, lowering the overall temperature of the electric drive system and extending the lifespan of the switching devices. This allows for a higher charging efficiency for the electric drive system, fully utilizing the high current output capacity of the charging pile and ensuring efficient charging of the power battery.

[0055] Therefore, the boost charging method provided in this application, in charging mode, by acquiring the output current signal of the charging pile and selectively switching different boost charging modes based on the current magnitude, can directly reduce the overall loss and temperature rise of the electric drive system during boost charging. The reduction in overall system loss directly reduces heat generation, thereby effectively controlling the temperature rise of the motor controller and improving the vehicle's charging efficiency. Furthermore, the effective reduction in loss and temperature rise can alleviate the thermal and electrical stresses applied to the switching devices, resulting in a more temperate operating temperature environment for the switching devices. Therefore, it can slow down the aging rate of the switching device materials in the motor controller, extending their service life and further improving the operational reliability of the electric drive system.

[0056] The following is about Figure 6 The implementation methods of each step in the illustrated embodiment are explained in detail below: Regarding step S602, in one possible implementation, such as Figure 7 As shown, the motor controller is selectively controlled to operate in a first boost charging mode or a second boost charging mode according to the output current. Specifically, this includes method 700, which includes steps S701 to S704. Steps S701 to S704 are described in detail below.

[0057] S701, obtain the output current of the charging pile.

[0058] S702, determine whether the output current of the charging pile is less than or equal to the first current threshold; if yes, execute S703, otherwise execute S704.

[0059] In this example, the first current threshold can be preset based on the intermittent operation threshold of the motor's three-phase inductor, the electrical characteristics of the SiC MOSFET, and charging safety standards.

[0060] It should be understood that during the vehicle's boost charging process, when the charging pile's output current is less than the first current threshold, the motor's three-phase inductors operate in intermittent mode. If the second boost charging mode is used directly to charge the battery at this time, reverse current flow from the battery will occur, leading to the failure of the boost charging control algorithm, increased overcurrent losses in the MOSFETs, and reverse current surges, thus affecting normal charging.

[0061] Once the output current of the charging pile exceeds the first current threshold, the three-phase inductor of the motor will stabilize and enter continuous charging mode. At this point, the risk of current backflow disappears, and the motor can enter the second boost charging mode.

[0062] Therefore, the first current threshold needs to cover different low-current intermittent mode scenarios. The first current threshold is set in the control module to ensure that when the charging pile's output current is less than or equal to this first current threshold, it is determined that there is a risk of backflow, and the first boost charging mode is prioritized. When the charging pile's output current is greater than this threshold, it is determined that there is no risk of backflow, and the second boost charging mode can be switched to improve charging efficiency.

[0063] It should be understood that, in order to avoid fluctuations in the operating mode of the motor's three-phase inductor when the critical current is reached, which would cause switching between the first boost charging mode and the second boost charging mode, and to ensure that the system can still maintain stable continuous operation when the current reaches the first current threshold, the boost charging method provided in this application also adopts the first boost charging mode when the output current of the charging pile is equal to the first current threshold.

[0064] S703 controls the motor controller to operate in the first boost charging mode when the output current is less than or equal to the first current threshold.

[0065] In this example, when the output current is less than or equal to the first current threshold, the control module immediately triggers the first boost charging mode to achieve stable boost charging under low current conditions.

[0066] S704 controls the motor controller to operate in the second boost charging mode when the output current is greater than the first current threshold.

[0067] In this example, when the output current exceeds the first current threshold, the control module automatically switches to the control command for the second boost charging mode to ensure low-loss energy transmission under high current conditions, achieve a stable boost charging process, and improve the vehicle's charging efficiency.

[0068] Thus, by using the critical value of the intermittent operation of the three-phase inductor of the motor and the preset first current threshold based on the electrical characteristics of the SiC MOSFET, the first boost charging mode is prioritized when the output current of the charging pile is under low current conditions. This avoids problems such as control algorithm failure caused by battery current backflow, system voltage fluctuations, increased losses due to MOSFET overcurrent, and reverse energy surges, ensuring the safety and stability of the vehicle charging process. When the output current of the charging pile exceeds the first current threshold, the system switches to the second boost charging mode to achieve energy transfer with lower losses, reducing system temperature rise, minimizing silicon carbide device aging, and improving charging efficiency and the reliability of the electric drive system.

[0069] Regarding step S703, in one possible implementation, when the output current is less than a first current threshold, the motor controller is controlled to operate in a first boost charging mode, specifically including: The upper bridge switch in the multiple arms of the motor controller is turned off, and the lower bridge switch is turned on intermittently; the power energy of the charging pile is used to charge the power battery through the freewheeling path of the upper bridge switch.

[0070] In this example, when the output current is less than or equal to the first current threshold, the control module immediately outputs a control command for the first boost charging mode, continuously outputting pulse signals only to the gates of the fourth, fifth, and sixth MOSFETs in the lower bridge switch. These pulse signals drive the channels of the MOSFETs in the lower bridge switch to conduct stably, allowing the motor's three-phase inductors to form a closed loop with the charging pile through the lower bridge arm. Current flows through the three-phase inductors, storing energy in the form of magnetic field energy. Simultaneously, the control module does not output pulse signals to the gates of the first, second, and third MOSFETs in the upper bridge switch; the channels of the upper bridge arm MOSFETs remain in the off state. When the lower and upper bridge pulses are low, the magnetic field energy stored in the three-phase inductors cannot be suddenly interrupted. It can only form a freewheeling path through the freewheeling diodes inside the MOSFETs in the upper bridge switch, transferring electrical energy to the power battery via these freewheeling diodes, thus achieving stable boost charging of the vehicle under low current conditions.

[0071] Regarding step S704, in one possible implementation, when the output current is greater than the first current threshold, the motor controller is controlled to operate in the second boost charging mode, specifically including: The upper and lower bridge switches in the multiple bridge arms of the motor controller are alternately turned on; the electrical energy of the charging pile charges the power battery through the conduction path of the upper bridge switch.

[0072] In this example, when the output current is greater than the first current threshold, the control module automatically switches to the control command of the second boost charging mode, generating corresponding complementary control pulse signals for the upper and lower bridge arms.

[0073] The control module first outputs high-level signals to the gates of the fourth, fifth, and sixth MOSFETs in the lower bridge switch, driving the MOSFET channels in the lower bridge switch to conduct, allowing the three-phase inductors of the motor to store energy normally. When the lower bridge pulse is low (i.e., the MOSFET channels in the lower bridge switch are off), the control module outputs high-level signals to the gates of the first, second, and third MOSFETs in the upper bridge switch, causing the MOSFET channels in the upper bridge switch to conduct. At this time, the energy stored in the three-phase inductors of the motor no longer relies on the freewheeling diodes in the upper bridge switch, but instead forms an energy transfer path through the channels of the MOSFETs in the upper bridge switch. The on-resistance of the MOSFET channels is much smaller than that of the freewheeling diodes. That is, compared to the body diode freewheeling which always relies on a high on-state voltage drop, this step uses an optimized active switching mode to form a lower-loss current path, ensuring fast and low-loss energy transfer under high-current conditions, achieving a stable boost charging process, and improving the vehicle's charging efficiency.

[0074] In one possible implementation, the upper and lower bridge switches in multiple arms of the motor controller are alternately turned on, specifically including: The first pulse signal is output to the upper bridge switch, and the second pulse signal is output to the lower bridge switch.

[0075] In this example, such as Figure 8 As shown, the first pulse signal output by the control module is the upper bridge pulse, and the second pulse signal is the lower bridge pulse. The two are complementary pulse signals. That is, when the upper bridge pulse is in a high level state, the lower bridge pulse is in a low level state, and when the upper bridge pulse is in a low level state, the lower bridge pulse is in a high level state. The two pulse signals are transmitted independently to the gate of the upper bridge switch and the gate of the lower bridge switch, respectively.

[0076] The upper bridge switch turns on or off in response to the first pulse signal, and the lower bridge switch turns on or off in response to the second pulse signal.

[0077] In this example, the gates of the first, second, and third MOSFETs in the upper bridge switch receive a first pulse signal. When the first pulse signal is high, the channel between the source and drain of the MOSFETs in the upper bridge switch is turned on, and the MOSFETs in the upper bridge switch are in the on state. When the first pulse signal is low, the channel of the MOSFETs in the upper bridge switch is turned off, and the upper bridge switch is in the off state. Similarly, the gates of the fourth, fifth, and sixth MOSFETs in the lower bridge switch receive a second pulse signal. When the second pulse signal is high, the channel between the source and drain of the MOSFETs in the lower bridge switch is turned on, and the lower bridge switch is in the on state. When the second pulse signal is low, the channel of the MOSFETs in the lower bridge switch is turned off, and the lower bridge switch is in the off state.

[0078] After the upper bridge switch switches from the on state to the off state, the lower bridge switch is only allowed to turn on after the first dead time.

[0079] For example, such as Figure 8 As shown, when the first pulse signal switches from high level to low level, the first, second, and third MOSFETs of the upper bridge switch switch switch from the on state to the off state. After a first dead time of t1, the second pulse signal switches to high level, and the fourth, fifth, and sixth MOSFETs of the lower bridge switch are allowed to enter the on state. Setting the first dead time t1 can prevent the lower bridge switch from being turned on when the upper bridge switch is not completely turned off, thus preventing the risk of a short circuit caused by the shoot-through between the upper and lower bridge switches.

[0080] After the lower bridge switch switches from the on state to the off state, the upper bridge switch is only allowed to turn on after the second dead time.

[0081] For example, such as Figure 8 As shown, when the second pulse signal switches from high level to low level, the fourth, fifth, and sixth MOSFETs of the lower bridge switch switch switch from the on state to the off state. After a second dead time of t2, the first pulse signal switches to high level, and the first, second, and third MOSFETs of the upper bridge switch are allowed to enter the on state. The second dead time t2 can prevent the upper bridge switch from being turned on when the lower bridge switch is not completely turned off, further ensuring circuit safety during the alternating conduction process of the upper and lower bridge switches.

[0082] Thus, by setting the first dead time t1 and the second dead time t2, the situation where the lower bridge switch is turned on when the upper bridge switch is not completely turned off, or the upper bridge switch is turned on when the lower bridge switch is not completely turned off, is effectively avoided. The other switch is turned on only after the upper or lower bridge switch is completely turned off, thus avoiding the short circuit risk of direct connection between the upper and lower bridge switches. This ensures the operational safety and stability of the motor controller bridge arm circuit and provides a stable and reliable circuit environment for the low loss and high charging efficiency of the second boost charging mode, further ensuring the operational reliability of the electric drive system under boost charging.

[0083] In one possible implementation, before outputting the first pulse signal to the upper bridge switch, the boost charging method provided in this application further includes: the motor controller sending a target pulse request signal to the controller; and the controller generating a first pulse signal and a second pulse signal corresponding to the target duty cycle based on the target pulse request signal.

[0084] In this example, the target pulse request signal can be determined by the motor controller based on charging requirements (such as current charging power, battery status, etc.). After receiving the target pulse request signal, the controller can generate a first pulse signal (used to control the upper bridge switch) and a second pulse signal (used to control the lower bridge switch) with the target duty cycle according to the preset duty cycle adjustment rules, so as to achieve precise control of the conduction time of the upper and lower bridge switches and ensure the stability and efficiency of the vehicle boost charging process.

[0085] In one possible implementation, the duty cycle values ​​corresponding to the output strategies of the first and second pulse signals are derived from the application layer in actual operation. Specifically, the application layer sends the desired pulse output type to the underlying software. The underlying software then rewrites the values ​​of the registers inside the control module based on this request type. These registers store the relevant control parameters for the pulse signal output. After the register values ​​are rewritten, the controller generates the corresponding first and second pulse signals based on the target pulse request signal sent by the motor controller and the target duty cycle desired by the application layer.

[0086] Thus, the boost charging method provided in this application generates a target pulse request signal according to the charging demand by the motor controller and sends it to the controller. Based on the signal and the preset duty cycle adjustment rules, the controller generates a first pulse signal and a second pulse signal with a target duty cycle to precisely control the conduction time of the upper and lower bridge switches, thereby ensuring the stability and efficiency of the vehicle's boost charging process.

[0087] In one possible implementation, such as Figure 9 As shown, to further improve the accuracy of current detection and system stability, ensure precise switching of the boost mode, and thus better optimize the operational reliability of the electric drive system during charging, method 900 can be further executed. Method 900 includes S901 to S907. S901 to S907 are described in detail below.

[0088] S901, obtain the output current of the charging pile.

[0089] S902, determine whether the output current of the charging pile is less than or equal to the second current threshold; if yes, execute S903; if no, execute S905.

[0090] In this example, after the determination module receives the charging pile output current transmitted by the acquisition module, it compares the output current with the preset second current threshold to determine the operating range of the current charging current, wherein the first current threshold is greater than the second current threshold.

[0091] S903, if the output current of the charging pile is less than or equal to the second current threshold, the motor controller sends a target pulse request signal to the controller.

[0092] S904, the controller generates a first pulse signal based on the target pulse request signal.

[0093] In this example, if the output current is determined to be less than or equal to the second current threshold, the motor controller is controlled to operate in the first boost charging mode.

[0094] After receiving the target pulse request signal from the motor controller, the controller generates a corresponding first pulse signal based on the extracted target pulse request signal. The controller can use the first pulse signal to control the motor controller to operate in the first boost charging mode, ensuring the boost charging process under low power conditions.

[0095] S905, if the output current of the charging pile is greater than the second current threshold, determine whether the output current of the charging pile is less than or equal to the first current threshold; if yes, execute S903; if no, execute S906.

[0096] In this example, when the determination module determines that the output current of the charging pile is greater than the second current threshold, the determination module will continue to compare the actual value of the output current with the preset first current threshold in real time.

[0097] It should be understood that the switching of the three-phase inductor of the motor from freewheeling mode to continuous mode is not instantaneous, but involves a transition range. When the current fluctuates briefly near the first current threshold, it can lead to frequent switching of the charging mode, causing the underlying software to repeatedly rewrite the controller registers. This may cause the power devices to overheat and be damaged due to excessive switching frequency. Similarly, when the current just exceeds the first current threshold, it may be in the transition period from discontinuous mode to continuous mode.

[0098] Setting both a second and a first current threshold effectively creates a hysteresis range for determining the output current. When the charging pile's output current increases from low to high, it must exceed the first current threshold to switch to the second boost charging mode, ensuring the motor's three-phase inductors enter a stable continuous charging mode. Conversely, when the charging pile's output current decreases from high to low, it must fall below the second current threshold to switch back to the first boost charging mode. This avoids the risk of transitional operating conditions and the instability of pulse output caused by frequent switching of boost charging modes, further ensuring the reliability of vehicle boost charging.

[0099] S906, if the output current of the charging pile is greater than the first current threshold, the motor controller sends a target pulse request signal to the controller.

[0100] S907, the controller generates a second pulse signal based on the target pulse request signal.

[0101] In this example, if the output current is determined to be greater than the first current threshold, the motor controller is controlled to operate in the second boost charging mode.

[0102] When the determination module determines that the output current of the charging pile is greater than the first current threshold, the motor controller sends a target pulse request signal to the controller. The controller generates a second pulse signal based on the signal and simultaneously controls the motor controller to switch to the second boost charging mode. This will not be elaborated further.

[0103] Thus, by first determining whether the output current is less than or equal to the second current threshold, and then determining whether it is less than the first current threshold when it is greater than the second threshold, a hysteresis interval can be constructed between the first and second current thresholds. On the one hand, this avoids frequent switching of boost charging modes caused by fluctuations in the output current around a single threshold, preventing damage to switching devices due to excessive switching frequency. On the other hand, it covers the risks when the output current is in a transitional operating condition, ensuring that the second boost charging mode is only switched to when the output current stably exceeds the first current threshold during the rising phase, and the first boost charging mode is only switched back to during the falling phase when the current drops below the second current threshold, thereby ensuring the stability, safety, and efficiency of the vehicle during boost charging.

[0104] In one possible implementation, the first current threshold can be set to 50 amperes (A) and the second current threshold can be set to 20 A.

[0105] In this example, when the charging pile's output current is less than 50A, the first boost charging mode is used; when the output current is greater than 50A, the second boost charging mode is used. In real-vehicle testing, as... Figure 10 As shown, the charging efficiency of the method provided in this application is significantly higher than that of traditional boost charging methods. Therefore, the boost charging method provided in this application achieves higher charging efficiency, helps optimize the charging performance of the electric drive system, improves the charging experience, and can protect the components in the electric drive system from the risk of overheating damage, extend the service life of the components, and further ensure the long-term operational reliability of the electric drive system.

[0106] In one possible design, the boost charging device 500 can be used to perform the steps or processes executed in methods 600, 700, and 900 in any of the above method embodiments.

[0107] For example, the acquisition module 501 is used to acquire the output current of the charging pile when the electric drive system is operating in charging mode. The determination module 502 is used to determine, based on the output current, whether the motor controller is operating in a first boost charging mode or a second boost charging mode, wherein the charging efficiency of the electric drive system is greater in the second boost charging mode than in the first boost charging mode. The control module 503 is used to, when it is determined that the motor controller is operating in the first boost charging mode, control the upper bridge switch in the multiple bridge arms of the motor controller to be continuously turned off and control the lower bridge switch to be intermittently turned on, so that the output current charges the power battery through the freewheeling diode of the upper bridge switch; when it is determined that the motor controller is operating in the second boost charging mode, control the upper bridge switch and the lower bridge switch in the multiple bridge arms of the motor controller to be turned on alternately, so that the electrical energy of the charging pile charges the power battery through the conduction path of the upper bridge switch. For simplicity, further details are omitted here.

[0108] The above are merely examples; for detailed steps or procedures, please refer to the descriptions in the foregoing embodiments.

[0109] Figure 11 This is a schematic block diagram of the boost charging device provided in the embodiments of this application.

[0110] like Figure 11 As shown, the device 1100 includes a processor 1101, a memory 1102, an executable program 1103, and a communication interface 1104.

[0111] It should be understood that the device 1100 may be a chip, chip system, or processor, etc., in a terminal device or network device to implement the above methods. The device 1100 can be used to implement the methods described in the above method embodiments, and for details, please refer to the description in the above method embodiments.

[0112] The processor 1101 serves as the computing core, responsible for calling the executable program 1103 stored in the memory 1102 to execute core algorithms such as pulse width modulation, current threshold judgment, and mode switching control. It can also execute the entire process instructions of the boost charging method.

[0113] The memory 1102 can be used to temporarily store intermediate processing results, providing the processor with low-latency data access capabilities and ensuring the real-time performance of the boost charging process mode control. It can also be used to store the core code and algorithm logic that implement the boost charging method, which can be the executable program 1103 shown in the figure, to achieve long-term retention of the core functions of boost charging.

[0114] The communication interface 1104 is used for external interaction. It can be used to receive the output current signal of the charging pile and send control commands to the feedback signal of the motor controller, supporting the boost charging process and the collaborative work of multiple modules.

[0115] Device 1100 also includes a bus, which serves as an internal data channel connecting the processor, memory, and communication interface to achieve efficient internal data transmission and ensure collaborative operation between various hardware components.

[0116] With the cooperation of the above hardware components, the device 1100 can complete the entire process of current detection, mode judgment, pulse signal generation, and mode switching, providing hardware support for the implementation of the boost charging method.

[0117] According to the method provided in the embodiments of this application, this application also provides an electronic device for implementing the boost charging method described in any of the foregoing embodiments. This electronic device can serve as the core control unit of a boost charging device or a control module of an electric drive system.

[0118] Specifically, the electronic device includes a processor and a memory connected to the processor via a bus. The memory stores computer-executed instructions, which correspond to the operational logic related to current detection, threshold comparison, boost mode switching, and pulse signal generation in the aforementioned method embodiments.

[0119] The computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, Digital Video Discs (DVDs), Compact Disc Read-Only Memory (CD-ROMs), microdrives, and magneto-optical disks, read-only memory (ROMs), random access memory (RAMs), erasable programmable read-only memory (EPROMs), electrically erasable programmable read-only memory (EEPROMs), dynamic random access memory (DRAMs), video random access memory (VRAMs), flash memory devices, magnetic cards or optical cards, nanosystems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0120] The processor reads and executes the aforementioned computer execution instructions from memory, realizing the entire process of the boost charging method by calling hardware resources. Through the coordinated work of the processor and memory, this electronic device can efficiently execute any of the aforementioned boost charging methods, solving the problems of low charging efficiency and poor system stability in traditional boost charging strategies, and improving the charging efficiency, operational reliability, and lifespan of power devices in the electric drive system.

[0121] According to the method provided in the embodiments of this application, this application also provides a computer-readable storage medium for storing computer-executable instructions for implementing any of the boost charging methods in the foregoing embodiments. When the instructions in the storage medium are executed by a processor, the electronic device in which the processor resides can complete the entire process of the boost charging method.

[0122] The computer-readable storage medium can be any medium with data storage capabilities, including but not limited to volatile memory, such as random access memory, which can temporarily store instructions and intermediate data being executed by the processor, suitable for high-frequency access to temporary data processing during the implementation of the boost charging method. Alternatively, it can be non-volatile memory, such as read-only memory, flash memory, hard disk, solid-state drive, etc., which can store the core instructions of the boost charging method for a long time, ensuring that the instructions are not lost after the device is powered off. It can also be a removable storage medium, such as an optical disc, USB flash drive, etc., facilitating the distribution and deployment of the boost charging program.

[0123] The computer execution instructions stored in the storage medium can be read and executed by the processor of the electronic device, and the steps implemented are completely consistent with the process described in the foregoing method embodiments.

[0124] Through this computer-readable storage medium, the aforementioned boost charging method can be embedded into an executable program, facilitating portability between different electronic devices or distributed computing nodes, ensuring standardized implementation and cross-platform compatibility of the method, and further expanding the application scenarios of the boost charging method.

[0125] According to the method provided in the embodiments of this application, this application also provides a computer program, which includes computer program code. When the computer program code is run on a computer, it causes the computer to perform the various steps or processes required by the boost charging method in any of the foregoing method embodiments.

[0126] In the embodiments of this application, the terms and English abbreviations are exemplary examples given for ease of description and should not be construed as limiting the application in any way. This application does not preclude the possibility of defining other terms that can achieve the same or similar functions in existing or future agreements.

[0127] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated.

[0128] In the several embodiments provided in this application, it should be understood that the disclosed systems and methods can be implemented in other ways. For example, the apparatus embodiments described above are illustrative. For example, the division of units is a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0129] It should be understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0130] In summary, the above are merely preferred embodiments of the technical solutions of this application and are not intended to limit the scope of protection of this application.

[0131] Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A boost charging method, characterized in that, The method, applied to an electric drive system including a motor and a motor controller, wherein the motor is connected to a charging pile and the motor controller, and the motor controller is connected to a power battery, includes: When the electric drive system is in charging mode, the output current of the charging pile is acquired; The motor controller is selectively controlled to operate in a first boost charging mode or a second boost charging mode based on the output current, wherein the charging efficiency of the electric drive system in the second boost charging mode is greater than the charging efficiency of the electric drive system in the first boost charging mode.

2. The method according to claim 1, characterized in that, The step of selectively controlling the motor controller to operate in a first boost charging mode or a second boost charging mode based on the output current includes: When the output current is less than or equal to the first current threshold, the motor controller is controlled to operate in the first boost charging mode; When the output current is greater than the first current threshold, the motor controller is controlled to operate in the second boost charging mode.

3. The method according to claim 2, characterized in that, The step of controlling the motor controller to operate in the second boost charging mode when the output current is greater than the first current threshold includes: The upper bridge switch and lower bridge switch in multiple bridge arms of the motor controller are alternately turned on; The electrical energy from the charging pile charges the power battery through the conduction path of the bridge switch.

4. The method according to claim 3, characterized in that, The alternating activation of the upper and lower bridge switches in the multiple bridge arms of the motor controller includes: A first pulse signal is output to the upper bridge switch, and a second pulse signal is output to the lower bridge switch; The upper bridge switch is turned on or off in response to the first pulse signal, and the lower bridge switch is turned on or off in response to the second pulse signal; After the upper bridge switch switches from the on state to the off state, the lower bridge switch is allowed to turn on only after a first dead time. After the lower bridge switch switches from the on state to the off state, the upper bridge switch is allowed to turn on only after a second dead time has elapsed.

5. The method according to claim 4, characterized in that, Before outputting the first pulse signal to the upper bridge switch, the method further includes: The motor controller sends a target pulse request signal to the controller; The controller generates a first pulse signal and a second pulse signal corresponding to the target duty cycle based on the target pulse request signal.

6. The method according to claim 2, characterized in that, The step of controlling the motor controller to operate in the first boost charging mode when the output current is less than the first current threshold includes: The upper bridge switch in the multiple bridge arms of the motor controller is turned off, and the lower bridge switch in the multiple bridge arms of the motor controller is turned on intermittently. The electrical energy from the charging pile is used to charge the power battery through the freewheeling path of the bridge switch.

7. The method according to any one of claims 2 to 6, characterized in that, Before controlling the motor controller to operate in the first boost charging mode when the output current is less than or equal to the first current threshold, the method further includes: Determine whether the output current is less than or equal to a second current threshold, wherein the second current threshold is less than the first current threshold; If it is determined that the output current is less than or equal to the second current threshold, the motor controller is controlled to operate in the first boost charging mode. If it is determined that the output current is greater than the second current threshold, then it is determined again whether the output current is less than or equal to the first current threshold.

8. A boost charging device, characterized in that, An application in an electric drive system, the electric drive system including a motor and a motor controller, the motor being connected to a charging pile and the motor controller, the motor controller being connected to a power battery, the device comprising: The acquisition module is used to acquire the output current of the charging pile when the electric drive system is operating in charging mode; The determining module is configured to determine, based on the output current, whether the motor controller is operating in a first boost charging mode or a second boost charging mode, wherein, in the second boost charging mode, the charging efficiency of the electric drive system is greater than the charging efficiency in the first boost charging mode; and... The control module is configured to, when determining that the motor controller is operating in the first boost charging mode, control the upper bridge switch in the multiple bridge arms of the motor controller to be continuously turned off and control the lower bridge switch to be intermittently turned on, so that the output current charges the power battery through the freewheeling path of the upper bridge switch; and when determining that the motor controller is operating in the second boost charging mode, control the upper bridge switch and the lower bridge switch in the multiple bridge arms of the motor controller to be turned on alternately, so that the electrical energy of the charging pile charges the power battery through the conduction path of the upper bridge switch.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the boost charging method as described in any one of claims 1 to 7.

10. A computer program, characterized in that, When the computer program is run on a computer, it causes the computer to perform the boost charging method as described in any one of claims 1 to 7.

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