Quick charging control method and device, equipment, storage medium and program product

Abstract

The invention discloses a quick charging control method and device, equipment, a storage medium and a program product, and relates to the technical field of vehicles. The method comprises the steps of obtaining a current charging voltage of a battery in response to a quick charging signal; determining a voltage difference value between the current charging voltage and a fast charging voltage demand of the battery; according to a preset phase difference and a voltage difference value between at least two target phases of the motor, power switching devices in target bridge arms corresponding to the target phases are controlled to be turned on and turned off, so that motor windings of the corresponding phases store energy during the turn-on period and release electric energy to a battery during the turn-off period, the voltage difference value which cannot be provided by the current charging equipment is provided for the battery, and rapid charging of the battery is achieved together with the current charging equipment. Meanwhile, on the basis of the preset phase difference, the switching time of the power switching device corresponding to each target phase is staggered, and voltage and current ripples can be reduced, so that the electric energy loss is reduced, and the technical problem of low charging efficiency of the electric vehicle is solved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicles, and particularly to a control method, device, equipment, storage medium and program product for fast charging. Background Art

[0002] Currently, in order to achieve fast charging of electric vehicles, a boost chopper circuit based on in-phase pulse width modulation (PWM) control is usually used to achieve voltage boost; specifically, the duty cycle of the pulse width modulation signal with the same frequency and phase is adjusted to control the switching device in the BOOST converter, and the current charging voltage is regulated.

[0003] However, since the actions of the switching devices are synchronous, a large transient current change will occur at the input end, resulting in a large fluctuation in the input current. Moreover, the large current fluctuation further causes the energy conversion in the energy storage element (such as an inductor) to be not smooth enough, resulting in energy loss.

[0004] Therefore, implementing voltage boost in the above manner will reduce the charging efficiency of electric vehicles. Summary of the Invention

[0005] The main purpose of the present application is to provide a control method, device, equipment, storage medium and program product for fast charging, aiming to solve the technical problem of low charging efficiency of electric vehicles.

[0006] To achieve the above purpose, the present application proposes a control method for fast charging, and the method includes:

[0007] In response to a fast charging signal, obtain the current charging voltage of the battery;

[0008] Determine the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery;

[0009] According to the preset phase difference between at least two target phases of the motor and the voltage difference, respectively control the conduction and turn-off of the power switching devices in the target bridge arms corresponding to each target phase, so that the motor windings of the corresponding phases store energy during conduction and release electrical energy to the battery during turn-off.

[0010] In an embodiment, the step of respectively controlling the conduction and turn-off of the power switching devices in the target bridge arms corresponding to each target phase according to the preset phase difference between at least two target phases of the motor and the voltage difference includes:

[0011] According to the preset phase difference, determine the counter values respectively corresponding to each target phase;

[0012] Determine the duty cycle of the pulse width modulation signals of each target phase within a preset pulse width modulation period according to the voltage difference value;

[0013] Control the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset pulse width modulation period, duty cycle, and the counter value.

[0014] In one embodiment, the step of controlling the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset pulse width modulation period, duty cycle, and the counter value includes:

[0015] Generate a pulse width modulation signal according to the preset pulse width modulation period and duty cycle to control the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase;

[0016] During the process of generating the pulse width modulation signal, control the counting start moment of the counters corresponding to each target phase within the preset pulse width modulation period according to the counter value, so as to apply a corresponding phase shift to the pulse width modulation signals of each target phase.

[0017] In one embodiment, the step of controlling the counting start moment of the counters corresponding to each target phase within the preset pulse width modulation period according to the counter value includes:

[0018] Control the counter corresponding to the reference phase to start counting. When the counter corresponding to the reference phase counts to the target value, trigger the counters corresponding to the other phases except the reference phase to start counting; wherein, the reference phase is any one of at least two of the target phases, and the target value is the counter value corresponding to the other phases.

[0019] In one embodiment, after the step of determining the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery, the following steps are further included:

[0020] Determine the current charging mode;

[0021] If the current charging mode is a mode of charging based on at least two phases, then execute the step of controlling the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset phase difference between at least two target phases of the motor and the voltage difference value.

[0022] In one embodiment, if the current charging mode is a mode of charging based on one phase, then control the conduction and cutoff of the power switch devices in the corresponding bridge arm according to the voltage difference value, and do not execute the step of controlling the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset phase difference between at least two target phases of the motor and the voltage difference value.

[0023] In addition, to achieve the above object, the present application further provides a control device for fast charging, and the control device for fast charging includes:

[0024] An acquisition module, configured to acquire the current charging voltage of the battery in response to a fast charging signal;

[0025] A difference determination module, configured to determine the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery;

[0026] A control module, configured to control the conduction and turn-off of the power switch devices in the target bridge arms corresponding to the respective target phases according to the preset phase difference between at least two target phases of the motor and the voltage difference, so that the motor windings corresponding to the respective phases store energy during conduction and release electrical energy to the battery during turn-off.

[0027] In addition, to achieve the above object, the present application further provides a control device for fast charging, and the device includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the control method for fast charging as described above.

[0028] In addition, to achieve the above object, the present application further provides a storage medium, and the storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the control method for fast charging as described above are implemented.

[0029] In addition, to achieve the above object, the present application further provides a computer program product, and the computer program product includes a computer program, and when the computer program is executed by a processor, the steps of the control method for fast charging as described above are implemented.

[0030] One or more technical solutions proposed by the present application have at least the following technical effects:

[0031] The present application acquires the current charging voltage of the battery in response to a fast charging signal; determines the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery; and controls the conduction and turn-off of the power switch devices in the target bridge arms corresponding to the respective target phases according to the preset phase difference between at least two target phases of the motor and the voltage difference, so that the motor windings corresponding to the respective phases store energy during conduction and release electrical energy to the battery during turn-off. It can be understood that the present application utilizes the characteristics of the motor windings, enabling them to store energy during conduction and release electrical energy to the battery during turn-off as the power switch devices in the target bridge arms corresponding to the respective target phases conduct and turn off, providing a voltage difference that the current charging device cannot provide, and jointly achieving fast charging of the battery with the current charging device.

[0032] Meanwhile, since there is a preset phase difference between the target phases, the switching times of the power switch devices corresponding to the target phases are staggered, which can reduce the mutual interference between the target phases, thereby reducing the voltage and current ripples; since the voltage and current ripples are reduced, the power loss is reduced, thereby improving the charging efficiency of the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0034] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic flowchart provided for Embodiment 1 of the control method for fast charging of the present application;

[0036] Figure 2 It is a schematic diagram of the first scenario provided for Embodiment 1 of the control method for fast charging of the present application;

[0037] Figure 3 It is a schematic diagram of the second scenario provided for Embodiment 1 of the control method for fast charging of the present application;

[0038] Figure 4 It is a schematic flowchart provided for Embodiment 2 of the control method for fast charging of the present application;

[0039] Figure 5 It is a schematic diagram of the third scenario provided for Embodiment 2 of the control method for fast charging of the present application;

[0040] Figure 6 It is a schematic diagram of the module structure of the control device for fast charging according to the embodiment of the present application;

[0041] Figure 7 It is a schematic diagram of the device structure of the hardware operating environment involved in the control method for fast charging according to the embodiment of the present application.

[0042] The realization of the purpose, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] It should be understood that the specific embodiments described here are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0044] To better understand the technical solution of the present application, the following will be described in detail in conjunction with the accompanying drawings of the specification and specific embodiments.

[0045] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of implementing the above functions, a control device for fast charging, etc. Hereinafter, taking the control device for fast charging as an example, this embodiment and the following embodiments will be described.

[0046] Based on this, the embodiment of the present application provides a control method for fast charging. Refer to Figure 1 , Figure 1 which is a schematic flowchart of the first embodiment of the control method for fast charging of the present application.

[0047] In this embodiment, the control method for fast charging includes steps S10 to S30:

[0048] Step S10, in response to the fast charging signal, obtain the current charging voltage of the battery;

[0049] Step S20, determine the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery;

[0050] Currently, existing fast charging devices (such as fast charging piles and mobile power supplies) often cannot meet the high voltage requirements for fast charging of electric vehicle batteries. Therefore, the input voltage can be boosted to meet the fast charging requirements. Usually, a BOOST converter (such as a single-stage, multi-stage, wide input voltage range, multi-phase, and bridge-less converter), a resonant boost converter, a bidirectional DC-DC converter are used to achieve boosting, or a boost chopper circuit based on in-phase pulse width modulation (Pulse Width Modulation) control is used to achieve boosting. The BOOST converter is a circuit composed of an inductor, a diode, a switch, and a capacitor. The boosting principle based on the BOOST converter is based on the energy storage and release of the inductor. Refer to Figure 2 .

[0051] However, the specific process of using a boost chopper circuit based on in-phase pulse width modulation control to achieve boosting is as follows: adjust the duty cycle of the pulse width modulation signal with the same frequency and phase to control the switching device in the BOOST converter and adjust the current charging voltage; since the actions of the switching devices are synchronous, a large transient current change will occur at the input end, resulting in a large fluctuation in the input current, and the large current fluctuation further causes the energy conversion in the energy storage element (such as an inductor) to be not smooth enough, resulting in energy loss; therefore, using the above method to achieve boosting will reduce the charging efficiency of electric vehicles.

[0052] To solve the above technical problems, in this embodiment, a motor controller and a motor winding are used to jointly achieve fast charging of the battery in combination with the current charging device; at the same time, the switching times of the power switch devices corresponding to each target phase are staggered, thereby improving the charging efficiency of the electric vehicle.

[0053] It should be noted that the above control device for fast charging can be a microprocessor in the motor controller or other control devices. The control device for fast charging can be subordinate to the control device for fast charging, and the control device for fast charging can be the motor controller.

[0054] Specifically, the control device for fast charging responds to the fast charging signal, obtains the current charging voltage of the battery, and thereby determines whether the current charging voltage of the battery meets the voltage requirement for fast charging of the battery. It can be understood that if the current charging voltage of the battery is greater than or equal to the voltage requirement for fast charging of the battery, no boost processing is required; if the current charging voltage of the battery is less than or equal to the voltage requirement for fast charging of the battery, boost processing is required.

[0055] To achieve efficient energy transfer, in this embodiment, the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery is determined to determine how much more voltage needs to be provided to the battery to meet its fast charging voltage requirement.

[0056] Among them, the motor controller can directly send a query request to the Battery Monitoring and Management System (BMS) to obtain the current charging voltage of the battery (i.e., the output voltage of the current charging device). The fast charging signal can be triggered when it is detected that the charging device is electrically connected to the battery, or can be triggered by the user through the vehicle control system; the current charging device can be a device that is electrically connected to the battery and charges the battery; the fast charging voltage requirement of the battery is usually determined by the characteristics of the battery itself.

[0057] It can be understood that if the current charging device cannot provide sufficient voltage intensity to the battery, resulting in the inability to achieve fast charging, in this embodiment, the motor controller and the motor winding are used to jointly charge the battery in combination with the current charging device to meet its fast charging voltage requirement.

[0058] Among them, different types of batteries have different fast charging voltage requirements, and the charging state of the battery will also affect its optimal charging voltage; when the battery power is low, the fast charging voltage requirement is high; but as the battery approaches the full charge state, in order to protect the battery and maintain its life, the fast charging voltage requirement is low; therefore, it is possible to determine whether the current charging device can provide sufficient voltage intensity based on the fast charging voltage requirement.

[0059] Step S30: According to the preset phase difference and voltage difference between at least two target phases of the motor, control the conduction and turn-off of the power switch devices in the target bridge arms corresponding to each target phase respectively, so that the motor windings corresponding to the respective phases store energy during conduction and release electrical energy to the battery during turn-off.

[0060] Refer to Figure 3 , in this embodiment, there is no need to add a new boost circuit. Only the motor windings need to be reused. By controlling the conduction and turn-off of the power switch devices in the target bridge arms corresponding to each target phase through the motor controller, the motor windings store energy during conduction and release electrical energy to the battery (acting as an inductor) during turn-off, so as to jointly charge the battery with the current charging device; Figure 3 In , Hall is a Hall sensor, the FWD key and the REV key are respectively control keys for the running direction of the motor, RUW stop is a soft stop function, IGBT driver is a switch driver, and the REF key is a motor parameter setting key.

[0061] Specifically, this embodiment utilizes the characteristics of the motor windings, enabling them to store energy during conduction and release electrical energy to the battery during turn-off as the power switch devices in the target bridge arms corresponding to each target phase conduct and turn off, providing a voltage difference that the current charging device cannot provide for the battery, and jointly achieving fast charging of the battery with the current charging device.

[0062] It should be noted that the motor in this embodiment can be a single-phase motor, a three-phase motor, etc. Since a three-phase motor can provide a smoother rotating magnetic field, thereby reducing torque ripple and improving the operating efficiency of the motor, three-phase motors are usually used in electric vehicles. This embodiment takes the motor as a three-phase motor as an example for illustration.

[0063] In order to improve the flexibility of fast charging of the battery, after the step of determining the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery, the current charging mode can also be determined first; if the current charging mode is a mode based on charging with at least two phases, then the step of respectively controlling the conduction and turn-off of the power switch devices in the target bridge arms corresponding to at least two target phases of the motor according to the preset phase difference and voltage difference is executed.

[0064] It should be noted that different charging modes can be designed in advance for different electric vehicles. Among them, the charging mode includes a mode based on charging with one phase or a mode based on charging with at least two phases, etc. One of the charging modes can be pre-configured for the electric vehicle, or the charging mode can be changed through a preset program, etc.; but the charging mode is fixed during battery charging.

[0065] Specifically, based on the maximum voltage threshold that the motor controller can provide, as well as the thermal management requirements, EMC requirements, and boost requirements of the vehicle system, a charging mode based on a single-phase charge or a charging mode based on at least two-phase charges can be selected.

[0066] Different charging modes have different control logics. When selecting a charging mode based on a single-phase charge, during fast charging, only the on and off of the power switch devices in the corresponding arm of one phase (U phase, V phase, or W phase) need to be controlled. When selecting a charging mode based on at least two-phase charges, during fast charging, the on and off of the power switch devices in the corresponding arms of at least two phases (for example, two phases (U phase and V phase, V phase and W phase, U phase and W phase), or three phases (U phase, V phase, and W phase)) need to be controlled; that is, at least the above 7 charging modes can be selected for fast charging.

[0067] Specifically, when the current charging mode is a charging mode based on at least two-phase charges, since there will be interference problems between multiple phases, in this embodiment, according to the preset phase difference and voltage difference between at least two target phases of the motor, the on and off of the power switch devices in the corresponding target arms of each target phase are respectively controlled, so that the motor windings of the corresponding phases store energy during conduction and release electrical energy to the battery during turn-off.

[0068] It should be noted that the above method of using various converters to achieve voltage boost will also increase the hardware cost. When the power devices are changed or the hardware system is iterated, the boost circuit needs to be redesigned again, that is, the reusability is poor and the cost is high. Moreover, large fluctuations in the input current will also cause relatively large electromagnetic interference (Electromagnetic Compatibility, EMC); large fluctuations in the input current will also cause the energy conversion in energy storage elements (such as inductors) to be not smooth enough, resulting in energy loss and reducing the charging efficiency of electric vehicles; at the same time, frequent and synchronous switching actions will increase the loss of switching devices, and the generated heat is concentrated, resulting in relatively poor system reliability and durability.

[0069] In this embodiment, without adding a new boost circuit, by utilizing the characteristics of the motor windings and reusing the motor windings, the motor controller and the motor windings are combined with the current charging device to jointly achieve fast charging of the battery; the hardware cost is reduced, and since there is a preset phase difference between the target phases, the switching times of the power switch devices corresponding to the target phases are staggered, which can reduce the voltage and current ripples, thereby reducing the electromagnetic interference between the target phases; since the voltage and current ripples are reduced, the power loss is reduced and the charging efficiency is improved; moreover, the staggered switching actions in time can reduce the loss of the switching devices, make the generated heat evenly distributed, and improve the reliability and durability of the system.

[0070] Among them, the preset phase difference can be preset. For example, the phase difference between the three phases of the motor is 120 degrees, or there is an uneven phase difference between the three phases of the motor, etc. Since the uneven phase difference may cause an unbalanced magnetic flux density to be generated inside the motor after power-on, and the charging efficiency is lower compared to the case where the phase difference is 120 degrees, therefore, in this embodiment, it is preferably that the phase difference between the three phases of the motor is 120 degrees.

[0071] In addition, if the current charging mode is a mode of charging based on one phase, then according to the voltage difference, the conduction and cutoff of the power switch device in the corresponding bridge arm of the corresponding phase are controlled, and the step of respectively controlling the conduction and cutoff of the power switch device in the target bridge arm corresponding to each target phase according to the preset phase difference and the voltage difference between at least two target phases of the motor is not executed; that is, a different control logic is adopted from the mode of charging based on at least two phases.

[0072] Adopting the mode of charging based on one phase and controlling the conduction and cutoff of the power switch device in the corresponding bridge arm of the corresponding phase according to the voltage difference can not only reduce costs but also avoid the electromagnetic interference problem caused by the conduction of the power switch device. Compared with the mode of charging based on at least two phases, there is no need to design the phase difference, reducing the control complexity.

[0073] In this embodiment, when the current charging device cannot meet the voltage requirement of the battery, by utilizing the characteristics of the motor winding, the conduction and cutoff of the power switch device in the target bridge arm corresponding to each target phase are controlled, so that the motor winding stores energy during conduction and releases electrical energy to the battery during cutoff, providing the voltage difference that the current charging device cannot provide for the battery, and jointly realizing the fast charging of the battery with the current charging device, which can save costs and save the space of the motor controller; since there is a preset phase difference between the target phases, the switching times of the power switch devices corresponding to the target phases are staggered, which can improve the charging efficiency of the electric vehicle, reduce the electromagnetic interference between the target phases, and improve the reliability and durability of the overall system. At the same time, the charging mode can be configured or adjusted according to actual needs, which can be applicable to different situations and improve flexibility.

[0074] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar content as that in the above-mentioned first embodiment can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 4 , step S30 includes steps S01 to S03:

[0075] Step S01, according to the preset phase difference, determine the counter values respectively corresponding to the target phases;

[0076] It should be noted that when this embodiment is designed to adopt a multi-phase charging mode, different conduction and turn-off methods are used for the power switching devices in the corresponding arms of different phases, so as to accurately provide sufficient voltage intensity for the battery and improve the charging efficiency.

[0077] Specifically, a counter is configured for each phase of the three-phase motor. In order to stagger the switching times of the power switching devices corresponding to each target phase, this embodiment determines the counter values corresponding to each target phase according to a preset phase difference. Since the characteristics of each pulse width modulation signal (such as duty cycle, carrier frequency, wave generation time, etc.) can be configured through corresponding registers, this embodiment fills the counter value into the registers corresponding to each phase to obtain a comparison value, so as to determine the wave generation time of the pulse width modulation signal during the pulse width modulation process, and can reduce the mutual interference between the target phases.

[0078] For example, when the preset phase difference is α, the counting method is upward counting, and the count value in a pulse width modulation period is C (the counter counts from 0 to C in a complete cycle), since a pulse width modulation period corresponds to 360 degrees, the count value per degree is C / 360. Therefore, if a three-phase charging mode is adopted, the counter values between the three phases are 0, αC / 360, and αC / 180 respectively.

[0079] When the counting method of the counter is different, the corresponding calculated counter values are different. For example, when the counting method is up and down counting, the count value per degree is 2C / 360 (i.e., C / 180); this embodiment takes the upward counting method as an example for illustration.

[0080] Step S02, determine the duty cycle of the pulse width modulation signal of each target phase within a preset pulse width modulation period according to the voltage difference;

[0081] Moreover, in order to accurately provide the voltage difference that the current charging device cannot provide for the battery, this embodiment determines the duty cycle of the pulse width modulation signal of each target phase within a preset pulse width modulation period according to the voltage difference. Since the duty cycle determines the ratio of the high-level time to the low-level time of the pulse width modulation signal, the average voltage output to the load can be controlled according to the pulse width modulation signal with the corresponding duty cycle; improve the charging efficiency.

[0082] Specifically, if the target voltage is higher than the current voltage, increase the duty cycle of the pulse width modulation signal to increase the average current charging voltage; otherwise, decrease the duty cycle; a PID (Proportional-Integral-Derivative) controller can also be used to better adjust the duty cycle of the pulse width modulation signal; the PID controller can take into account the history of the error (integral part) and the rate of change (derivative part), so as to achieve more accurate and stable control.

[0083] Among them, the preset pulse width modulation period can be calculated based on the carrier frequency, and the carrier frequency is usually determined based on the motor specifications.

[0084] Step S03: Control the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset pulse width modulation period, duty cycle, and counter value.

[0085] Since the preset pulse width modulation period, duty cycle, and counter value of the pulse width modulation signal are determined, the shape and wave - sending time of the modulated pulse width modulation signal can also be determined. Therefore, the motor controller can accurately control the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase, so that the motor windings of the corresponding phases store sufficient electrical energy during conduction and release sufficient electrical energy to the battery during cutoff, and the switching times of the power switch devices corresponding to each target phase are staggered, thus reducing the mutual interference between each target phase while achieving fast charging.

[0086] Specifically, the implementation manner of controlling the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset pulse width modulation period, duty cycle, and counter value can be: generating a pulse width modulation signal according to the preset pulse width modulation period and duty cycle to control the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase; during the process of generating the pulse width modulation signal, according to the counter value, controlling the counting start time of the counters corresponding to each target phase within the preset pulse width modulation period to apply a corresponding phase shift to the pulse width modulation signals of each target phase.

[0087] Specifically, a pulse width modulation signal can be generated according to the preset pulse width modulation period and duty cycle to control the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase; during the process of generating the pulse width modulation signal, each target phase has a corresponding register (storing a comparison value), and the counter increments from 0 to C within each pulse width modulation period and is matched with the comparison value.

[0088] After the counter starts counting, compare the current count of the counter with the comparison value in the register, and control the counting start time of the counters corresponding to each target phase within the preset pulse width modulation period according to the comparison result, so as to stagger the wave - sending times of the pulse width modulation signals of different phases and achieve applying a corresponding phase shift to the pulse width modulation signals of each target phase.

[0089] Specifically, the implementation manner of controlling the counting start time of the counters corresponding to each target phase within the preset pulse width modulation period according to the counter value can be:

[0090] The counter corresponding to the control reference phase starts counting. When the counter corresponding to the reference phase counts to the target value, it triggers the counters corresponding to other phases except the reference phase to start counting; where the reference phase is any one of at least two target phases, and the target value is the counter value corresponding to other phases.

[0091] It should be noted that the reference phase can be any one of at least two target phases (for example, the U phase). The other phases except the reference phase can be the V phase, the W phase, or the other two phases (the V phase and the W phase). The counter corresponding to the control reference phase starts counting. When the counter corresponding to the U phase counts to the target value, it triggers the counters of the V phase and / or the W phase to start counting in the form of an interrupt or a synchronization signal.

[0092] Among them, the target value is the counter value corresponding to other phases. For example, when the counter corresponding to the U phase counts to αC / 360, it triggers the counter corresponding to the V phase to start counting in the form of an interrupt or a synchronization signal. When the counter corresponding to the U phase counts to αC / 180, it triggers the counter corresponding to the W phase to start counting in the form of an interrupt or a synchronization signal. At the end of each preset pulse width modulation period corresponding to each phase, its counter is cleared. Refer to Figure 5 ; thereby realizing the control of the starting moment of counting of the counters corresponding to each target phase within the preset pulse width modulation period, staggering the wave generation times of the pulse width modulation signals of different phases, and realizing the application of corresponding phase offsets to the pulse width modulation signals of each target phase; thereby staggering the switching times of the power switch devices in the target bridge arms corresponding to each target phase.

[0093] In this embodiment, by designing different conduction and cutoff methods for the power switch devices in the bridge arms corresponding to different phases when adopting the mode of charging based on multiple phases, sufficient voltage intensity is accurately provided for the battery; at the same time, the average voltage output to the load is controlled according to the pulse width modulation signal with the corresponding duty cycle, and the wave generation times of the pulse width modulation signals corresponding to each target phase are controlled according to the phase difference, staggering the switching times of the power switch devices in the target bridge arms corresponding to each target phase; thereby improving the charging efficiency as a whole.

[0094] It should be noted that the above examples are only for understanding the present application and do not constitute a limitation on the fast charging control method of the present application. Based on this technical concept, more forms of simple transformations are within the protection scope of the present application.

[0095] The present application also provides a fast charging control device. Please refer to Figure 6 , the fast charging control device includes:

[0096] An acquisition module 10, configured to acquire the current charging voltage of the battery in response to a fast charging signal;

[0097] A difference determination module 20 for determining the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery;

[0098] A control module 30 for controlling the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset phase difference and voltage difference between at least two target phases of the motor, so that the motor windings of the corresponding phases store energy during conduction and release electrical energy to the battery during cutoff.

[0099] In one embodiment, the control module 30 includes:

[0100] A first determination sub-module for determining the counter values respectively corresponding to each target phase according to the preset phase difference;

[0101] A second determination sub-module for determining the duty cycle of the pulse width modulation signal of each target phase within the preset pulse width modulation period according to the voltage difference;

[0102] A control sub-module for controlling the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset pulse width modulation period, duty cycle and counter value.

[0103] In one embodiment, the control sub-module includes:

[0104] A generation unit for generating a pulse width modulation signal according to the preset pulse width modulation period and duty cycle to control the conduction and cutoff of the power switch devices in the target bridge arms corresponding to each target phase;

[0105] A control unit for controlling the counting start moment of the counters respectively corresponding to each target phase within the preset pulse width modulation period according to the counter value during the process of generating the pulse width modulation signal, so as to apply a corresponding phase shift to the pulse width modulation signals of each target phase.

[0106] In one embodiment, the control unit includes:

[0107] A control sub-unit for controlling the counter corresponding to the reference phase to start counting, and when the counter corresponding to the reference phase counts to the target value, triggering the counters corresponding to other phases except the reference phase to start counting; wherein, the reference phase is any one of at least two target phases, and the target value is the counter value corresponding to other phases.

[0108] In one embodiment, after the step of determining the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery, the fast charging control device further includes:

[0109] A mode determination module for determining the current charging mode;

[0110] An execution module, configured to, if the current charging mode is a mode based on charging with at least two phases, execute the steps of respectively controlling the conduction and cutoff of the power switch devices in the target leg corresponding to each target phase according to a preset phase difference and a voltage difference between at least two target phases of the motor.

[0111] In an embodiment, if the current charging mode is a mode based on charging with one phase, then according to the voltage difference, control the conduction and cutoff of the power switch devices in the corresponding leg of the corresponding phase, and do not execute the steps of respectively controlling the conduction and cutoff of the power switch devices in the target leg corresponding to each target phase according to a preset phase difference and a voltage difference between at least two target phases of the motor.

[0112] The fast charging control device provided by the present application adopts the fast charging control method in the above embodiment, and can solve the technical problem of low charging efficiency of electric vehicles. Compared with the prior art, the beneficial effects of the fast charging control device provided by the present application are the same as those of the fast charging control method provided by the above embodiment, and other technical features in the fast charging control device are the same as those disclosed in the above embodiment method, and will not be elaborated herein.

[0113] The present application provides a fast charging control device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the fast charging control method in the first embodiment above.

[0114] Next, refer to Figure 7 , which shows a schematic structural diagram of a fast charging control device suitable for implementing the embodiments of the present application. The fast charging control device in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, tablet computers, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 7 The fast charging control device shown is only an example, and should not bring any limitation to the functions and usage scope of the embodiments of the present application.

[0115] As Figure 7As shown, the control device for fast charging may include a processing device 1001 (such as a central processing unit, a graphics processing unit, etc.), which may perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM: Random Access Memory) 1004. In the RAM 1004, various programs and data required for the operation of the control device for fast charging are also stored. The processing device 1001, the ROM 1002, and the RAM 1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems may be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 may allow the control device for fast charging to communicate with other devices wirelessly or wiredly to exchange data. Although the figure shows a control device for fast charging with various systems, it should be understood that it is not required to implement or have all the shown systems. More or fewer systems may be implemented or had alternatively.

[0116] In particular, according to the embodiments disclosed in the present application, the processes described above with reference to the flowcharts may be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes program codes for executing the methods shown in the flowcharts. In such an embodiment, the computer program may be downloaded and installed from a network through the communication device, or installed from the storage device 1003, or installed from the ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the methods of the embodiments disclosed in the present application are executed.

[0117] The control device for fast charging provided by the present application adopts the fast charging control method in the above-mentioned embodiment, and can solve the technical problem of low charging efficiency of electric vehicles. Compared with the prior art, the beneficial effects of the control device for fast charging provided by the present application are the same as those of the fast charging control method provided by the above-mentioned embodiment, and other technical features in the control device for fast charging are the same as those disclosed in the method of the previous embodiment, and will not be elaborated here.

[0118] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0119] As described above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application, and all of them should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0120] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the fast charging control method in the above embodiments.

[0121] The computer-readable storage medium provided by this application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or combined with an instruction execution system, device, or device. The program code contained on the computer-readable storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination of the above.

[0122] The above computer-readable storage medium can be included in the fast charging control device; or it can exist independently without being assembled into the fast charging control device.

[0123] The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed by the fast charging control device, the fast charging control device is caused to: execute the above fast charging control method.

[0124] Computer program code for performing the operations of this application can be written in one or more programming languages or combinations thereof. The above-mentioned programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (for example, by using an Internet service provider to connect through the Internet).

[0125] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of the systems, methods, and computer program products according to the embodiments of this application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutively represented blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0126] The modules described in the embodiments of this application can be implemented in software or in hardware. Among them, the name of the module does not constitute a limitation on the unit itself in some cases.

[0127] The readable storage medium provided by this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., computer programs) for performing the above-mentioned fast charging control method, and can solve the technical problem of low charging efficiency of electric vehicles. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the fast charging control method provided by the above embodiments, and will not be elaborated here.

[0128] The present application also provides a computer program product, including a computer program which, when executed by a processor, implements the steps of the fast charging control method as described above.

[0129] The computer program product provided by the present application can solve the technical problem of low charging efficiency of electric vehicles. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as those of the fast charging control method provided by the above embodiments, and will not be elaborated herein.

[0130] The above are only partial embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structural transformation made under the technical concept of the present application by using the content of the specification and drawings of the present application, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present application.

Claims

1. A fast charging control method, characterized in that: The method includes: In response to the fast charging signal, obtaining a current charging voltage of the battery; Determine a voltage difference between the current charging voltage and a fast charging voltage requirement of the battery; According to the preset phase difference between at least two target phases of the motor and the voltage difference, the on and off of the power switching devices in the target bridge arms corresponding to each target phase are controlled respectively, so that the motor windings of the corresponding phases store energy during the on period and release electrical energy to the battery during the off period.

2. The method according to claim 1, characterized in that The step of controlling the on and off of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset phase difference between at least two target phases of the motor and the voltage difference comprises: According to the preset phase difference, determining the counter value corresponding to each target phase; Determining the duty cycle of the pulse width modulation signal of each target phase within a preset pulse width modulation period according to the voltage difference; According to the preset pulse width modulation period, duty cycle and the counter value, the power switch devices in the target bridge arms corresponding to each target phase are controlled to be turned on and off respectively.

3. The method according to claim 2, characterized in that The step of controlling the on and off of the power switch devices in the target bridge arms corresponding to each target phase respectively according to the preset pulse width modulation period, duty cycle and the counter value comprises: Generate a pulse width modulation signal according to the preset pulse width modulation period and duty cycle to control the on and off of the power switch device in the target bridge arm corresponding to each target phase; In the process of generating the pulse width modulation signal, the counting start time of the counters corresponding to each target phase in the preset pulse width modulation period is controlled according to the counter value, so as to apply a corresponding phase offset to the pulse width modulation signal of each target phase.

4. The method according to claim 3, characterized in that The step of controlling the counting start time of the counters corresponding to each target phase within a preset pulse width modulation period according to the counter value comprises: Control the counter corresponding to the reference phase to start counting. When the counter corresponding to the reference phase counts to a target value, trigger the counters corresponding to other phases except the reference phase to start counting; wherein the reference phase is any one of at least two target phases, and the target value is the counter value corresponding to the other phases.

5. The method according to any one of claims 1 to 4, characterized in that After the step of determining the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery, the method further includes: Determine the current charging mode; If the current charging mode is a mode based on charging of at least two phases, the step of controlling the on and off of the power switching devices in the target bridge arms corresponding to each target phase according to the preset phase difference and the voltage difference between at least two target phases of the motor is executed.

6. The method according to claim 5, characterized in that If the current charging mode is a mode based on charging in one phase, the on and off of the power switching device in the bridge arm corresponding to the corresponding phase is controlled according to the voltage difference, and the step of controlling the on and off of the power switching device in the target bridge arm corresponding to each target phase according to the preset phase difference between at least two target phases of the motor and the voltage difference is not performed.

7. A fast charging control device, characterized in that: The device comprises: an acquisition module, used for acquiring a current charging voltage of the battery in response to a fast charging signal; A difference determination module, used to determine the voltage difference between the current charging voltage and the fast charging voltage requirement of the battery; The control module is used to control the on and off of the power switch devices in the target bridge arms corresponding to each target phase according to the preset phase difference between at least two target phases of the motor and the voltage difference, so that the motor winding of the corresponding phase stores energy during the on period and releases electrical energy to the battery during the off period.

8. A fast charging control device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the fast charging control method according to any one of claims 1 to 6.

9. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the fast charging control method according to any one of claims 1 to 6 are implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the fast charging control method according to any one of claims 1 to 6 are implemented.

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