Charging / discharging control method, charging device, and storage medium

Abstract

The present invention provides a charge / discharge control method, a charging device 100, and a storage medium. The method includes obtaining a residual voltage at an output terminal 11 after a charging circuit is turned off, controlling a discharge load 13 connected in parallel with the output terminal 11 to form a discharge circuit, and adjusting a frequency and / or a width and / or a dead time of the residual voltage to increase a discharge speed of the discharge circuit. In this way, the residual voltage on the charging device side can be quickly and safely released after the charging circuit is turned off.

Description

Related Applications

[0001] This application claims priority to a Chinese patent application filed on July 23, 2021, bearing application number 202110839708.6 and entitled "Charging and discharging control method, charging device, and storage medium," the entire contents of which are incorporated herein by reference. [Technical Field]

[0002] The present invention relates to the technical field of charging equipment for electric vehicles, and in particular to a charge / discharge control method, a charging equipment, and a storage medium. [Background technology]

[0003] To meet the demands of users for fast charging of electric vehicles, which aims to reduce charging time and costs, the charging power of charging equipment is generally set to a large value. However, because charging equipment usually includes a capacitive element, the charging voltage on the charging equipment side cannot be quickly released after the charging circuit of the charging equipment is turned off. This means that residual voltage is likely to occur on the charging equipment side, which may cause harm to personnel or the charging equipment. Therefore, how to quickly and safely release the residual voltage on the charging equipment side after the charging circuit is turned off is currently a technical problem that needs to be solved. Summary of the Invention

[0004] An object of the present invention is to provide a charge / discharge control method, device, equipment, and storage medium that can quickly and safely release residual voltage on the charging equipment side after the charging circuit is turned off.

[0005] To achieve the above object, in one aspect, an embodiment of the present invention provides a charge / discharge control method, including: obtaining a residual voltage at an output terminal after a charging circuit is turned off; controlling a discharge load connected in parallel with the output terminal to form a discharge circuit; and adjusting a frequency and / or a width and / or a dead time of the residual voltage so as to increase the discharge speed of the discharge circuit.

[0006] In one preferred embodiment of the present invention, obtaining the residual voltage at the output terminal includes obtaining voltage sample values ​​at the output terminal in a plurality of consecutive periods to generate a sequence of voltage sample values, and calculating an average value of a middle part of the sequence of voltage sample values ​​as the residual voltage at the output terminal.

[0007] In one preferred embodiment of the present invention, adjusting the frequency and / or width and / or dead time of the residual voltage includes adjusting the pulse frequency of the residual voltage to a larger value, adjusting the pulse width of the residual voltage to a smaller value when the residual voltage has not dropped to a predetermined voltage value even though the pulse frequency has been adjusted to the upper frequency limit, and adjusting the dead time of the residual voltage to a smaller value when the residual voltage has not dropped to the predetermined voltage value even though the pulse width has been adjusted to the lower width limit.

[0008] In one preferred embodiment of the present invention, increasing the pulse frequency of the residual voltage includes increasing the pulse frequency of the residual voltage by proportional adjustment within a predetermined frequency adjustment range.

[0009] In one preferred embodiment of the present invention, adjusting the pulse width of the residual voltage to a smaller value includes adjusting the pulse width of the residual voltage to a smaller value by proportional adjustment within a first width adjustment range based on the current pulse width of the residual voltage and a voltage error value, wherein the voltage error value is the difference between the current voltage value of the residual voltage and the predetermined voltage value.

[0010] In one preferred embodiment of the present invention, adjusting the dead time of the residual voltage to be smaller includes adjusting the dead time of the residual voltage by proportionally adjusting the pulse width of the residual voltage to be smaller within a second width adjustment range based on the current pulse width of the residual voltage and a voltage error value, wherein the voltage error value is the difference between the current voltage value of the residual voltage and the predetermined voltage value.

[0011] In one preferred embodiment of the present invention, adjusting the frequency and / or width and / or dead time of the residual voltage further includes turning off the discharge circuit when a current value of the discharge circuit exceeds a current threshold.

[0012] In one preferred embodiment of the present invention, controlling the discharge load connected in parallel with the output terminal to form a discharge circuit includes determining whether a residual voltage at the output terminal reaches a voltage threshold, and controlling the discharge load connected in parallel with the output terminal to form a discharge circuit when the residual voltage at the output terminal reaches the voltage threshold.

[0013] In one preferred embodiment of the present invention, the resistance value of the discharge load is smaller than the equivalent resistance value of the main circuit of the charging device.

[0014] In one preferred embodiment of the present invention, the charging process further includes performing constant current control and constant voltage control on the charging signal.

[0015] In another aspect, an embodiment of the present invention provides a charging device comprising a memory, a processor, and a computer program stored in the memory, the computer program performing the instructions of the above method when executed by the processor.

[0016] In another aspect, an embodiment of the present invention provides a computer storage medium having a computer program stored thereon, the computer program causing instructions of the above method to be executed when executed by a processor of a charging device.

[0017] In another aspect, an embodiment of the present invention provides a computer program product comprising a computer program, the instructions of the above method being carried out when the computer program is executed by a processor.

[0018] As can be seen from the above technical solutions of the embodiments of the present invention, in the embodiments of the present invention, after the charging circuit is turned off, the charging device obtains the residual voltage at the output end, and controls the discharge load connected in parallel with the output end to form a discharge circuit, so that the residual voltage can be discharged through the discharge circuit. In this process, the charging device adjusts the frequency and / or width and / or dead time of the residual voltage to increase the discharge speed of the discharge circuit, thereby realizing the rapid and safe discharge of the residual voltage at the output end. [Brief explanation of the drawings]

[0019] In order to more clearly describe the technical solutions of the embodiments of the present invention or the prior art, the following will briefly describe the drawings used in the description of the embodiments or the prior art. The drawings described below are only some embodiments of the present invention, and it is obvious that those skilled in the art can obtain other drawings based on these drawings without any creative efforts. [Figure 1] 1 is a schematic diagram of a charging device according to some embodiments of the present invention. [Figure 2] FIG. 2 is a circuit block diagram of a charging device according to some embodiments of the present invention. [Figure 3] 3 is a flowchart of a charge / discharge control method according to some embodiments of the present invention. [Figure 4] 4 is a flowchart of constant voltage control for a charging signal during a charging process according to some embodiments of the present invention. [Figure 5] 4 is a flowchart of constant current control for a charging signal during a charging process according to some embodiments of the present invention. [Figure 6] 10 is a flowchart of a charge / discharge control method according to some other embodiments of the present invention. [Figure 7] FIG. 2 is a structural block diagram of a charging device according to some embodiments of the present invention. [Explanation of symbols]

[0020] 100 Charging equipment 11 Output terminal 12 Main circuit of charging equipment 13 Discharge load 14 Controllable Switches 702 Charging equipment 704 processor 706 memory 708 Drive Mechanism 710 Input / Output Interface 712 Input Devices 714 Output Devices 716 Presentation equipment 718 Graphical User Interface 720 Network Interface 722 Communication Links 724 communication bus DETAILED DESCRIPTION OF THE INVENTION

[0021] In order to help those skilled in the art understand the technical solutions of the present invention better, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is clear that the described embodiments are only some embodiments of the present invention, and do not represent all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort fall within the scope of protection of the present invention. For example, in some descriptions, forming a second member above a first member may include an embodiment in which the first member and the second member are formed to be in direct contact with each other, or an embodiment in which the first member and the second member are formed to be in indirect contact with each other (i.e., an additional member is further provided between the first member and the second member).

[0022] For ease of description, in some embodiments of the present invention, spatial location terms such as "above," "below," "top," and "below" are used to describe the relationship between one element or component and another (or several other) element or component shown in each drawing of the embodiment. It is intended that the spatial location terms encompass different orientations during use or operation of the device other than the orientation depicted in the drawing. For example, if the device in the drawing were inverted, an element or component described as "below" or "below" another element or component would correspondingly be positioned "above" or "on" the other element or component.

[0023] An electric vehicle charging device according to an embodiment of the present invention is commonly referred to as a charging station, etc. To solve the problem in the prior art that it is difficult to quickly and safely release residual voltage in the charging device after the charging circuit is turned off, an embodiment of the present invention provides an improved charging device.

[0024] As shown in FIG. 1 , in some embodiments of the present invention, a charging equipment 100 includes one or more output terminals 11. The output terminals 11 may be connected to a charging port of an electric vehicle to charge the electric vehicle. As shown in FIG. 2 , a discharge load 13 (e.g., a purely resistive circuit such as a discharge resistor) may be connected in parallel with a main circuit 12 of the charging equipment to discharge residual voltage, and the discharge load 13 may be connected in series with a controllable switch 14. The controllable switch 14 is controlled by a processor (or controller) of the charging equipment. That is, a control signal may be sent from the processor of the charging equipment to the controllable switch 14 to control the opening and closing of the controllable switch 14. Specifically, when the control signal is an on signal, the controllable switch 14 is turned on, and a discharge circuit is formed by the discharge load 13, so that the residual voltage is discharged through the discharge circuit. When the control signal is an off signal, the controllable switch 14 is turned off, and the discharge load 13 is opened, so that the residual voltage is not discharged through the discharge load 13.

[0025] In view of the fact that the discharge rate of the discharge circuit is negatively correlated with discharge safety, it is preferable to prevent the discharge rate of the discharge circuit from becoming excessively high to prevent the discharge load 13 from overheating and causing a danger. Therefore, in an embodiment of the present invention, after the charging circuit is turned off, the processor of the charging equipment obtains the residual voltage at the output end, controls the discharge load to form a discharge circuit, and adjusts the frequency and / or width and / or dead time for the residual voltage, thereby increasing the discharge rate of the discharge circuit and achieving the goal of quickly and safely discharging the residual voltage. Specific implementations of adjusting the frequency and / or width and / or dead time for the residual voltage will be described later.

[0026] Preferably, in some other embodiments of the present invention, the resistance value of the discharge load 13 may be smaller than the equivalent resistance value of the main circuit 12 of the charging equipment in order to quickly discharge the residual voltage.

[0027] As shown in FIG. 3, in some embodiments of the present invention, the charging / discharging control method for a charging device may include the following steps.

[0028] S301: Obtain the residual voltage at the output end after the charging circuit is turned off.

[0029] S302: A discharge circuit is formed by controlling a discharge load connected in parallel with the output terminal.

[0030] S303: Adjust the frequency and / or width and / or dead time for the residual voltage so as to increase the discharge speed of the discharge circuit.

[0031] In an embodiment of the present invention, after the charging circuit is turned off, the charging device obtains the residual voltage at the output terminal, and controls a discharge load connected in parallel with the output terminal to form a discharge circuit, thereby discharging the residual voltage through the discharge circuit. In this process, the charging device adjusts the frequency, width, and / or dead time of the residual voltage to increase the discharge speed of the discharge circuit, thereby realizing the rapid and safe discharge of the residual voltage at the output terminal.

[0032] In some embodiments of the present invention, obtaining the residual voltage at the output may include the following steps.

[0033] 1) Voltage sampling values ​​are obtained from the output terminal over a number of consecutive periods to generate a series of voltage sampling values.

[0034] Here, the period refers to the period of the voltage signal at the output terminal. The voltage signal of the charging device is generally a periodic signal such as a pulse width modulation (PWM) signal. The charging device may be provided with a voltage sampling module and a current sampling module. Therefore, the voltage sampling module can obtain voltage sampling values ​​at the output terminal for multiple consecutive periods.

[0035] 2) Calculate the average value of the middle part of the voltage sampling value series, and use this average value as the residual voltage at the output terminal.

[0036] In the voltage sampling process, problems such as electromagnetic noise may exist, so the average value of the middle part of the voltage sampling value series can be used as the residual voltage at the output terminal, which is advantageous for obtaining an accurate residual voltage value. In this way, the residual voltage sampling and filtering can be realized.

[0037] For example, in one exemplary embodiment, the voltage values ​​of the output terminal are continuously collected for 10 periods and sorted in order of magnitude to generate a series of voltage samples. Four to six voltage samples in the middle of the series are extracted from the voltage sample series, and the average value is calculated to be the current residual voltage value of the output terminal.

[0038] In some embodiments of the present invention, performing frequency adjustment and / or width adjustment and / or dead time adjustment on the residual voltage may include the following steps.

[0039] 1) Increase the pulse frequency of the residual voltage.

[0040] The purpose of adjusting the residual voltage pulse frequency (i.e., increasing the frequency) is to increase the discharge current so as to increase the discharge rate. Compared with width adjustment (i.e., pulse width adjustment) and dead time adjustment, frequency adjustment can stabilize the discharge signal waveform more, i.e., is safer and more effective. Therefore, when adjusting the residual voltage, it is preferable to prioritize the frequency of the residual voltage.

[0041] In some embodiments of the present invention, increasing the residual voltage pulse frequency may include increasing the residual voltage pulse frequency by proportional adjustment within a predetermined frequency adjustment range (which may be determined according to the specific circumstances of the charging device). For example, in one exemplary embodiment, the frequency adjustment range for a certain charging device may be 85 KHz-165 KHz, that is, the residual voltage pulse frequency may be increased within the range of 85 KHz-165 KHz.

[0042] In some embodiments of the present invention, during the frequency adjustment, the current value of the discharge circuit may be detected in real time to determine whether it exceeds a current threshold, and if the current value of the discharge circuit exceeds the current threshold, the discharge circuit may be temporarily turned off, which is advantageous in preventing damage to the discharge load and improving the safety of residual voltage discharge.

[0043] 2) If the residual voltage does not drop to a predetermined voltage value even when the pulse frequency is adjusted to the upper frequency limit, adjust the pulse width of the residual voltage to a smaller value.

[0044] Even if the pulse frequency is adjusted to the upper frequency limit, if the residual voltage has not dropped to a predetermined voltage value (which may be set according to actual needs, for example, 36 V), the residual voltage pulse width may be adjusted smaller (i.e., reduced adjustment). The purpose of this is to further increase the discharge rate by adjusting the width. Although width adjustment provides slightly less waveform stability than frequency adjustment, it is superior to dead time adjustment. Therefore, if it is difficult to reduce the residual voltage to the predetermined voltage value by frequency adjustment, the discharge rate may be further increased by continuing to adjust the width as a second-best measure.

[0045] Of course, if the residual voltage can be made to drop to a predetermined voltage value before or when the pulse frequency is adjusted to the upper frequency limit, then a fast and safe discharge can be achieved without further adjustment.

[0046] In the embodiment of the present invention, during the above-mentioned width adjustment process, the current value of the discharge circuit may be detected in real time, and when the current value of the discharge circuit exceeds the current threshold, the discharge circuit is temporarily turned off to prevent damage to the discharge load and further improve the safety of the residual voltage discharge.

[0047] In some embodiments of the present invention, decreasing the pulse width of the residual voltage may include decreasing the pulse width of the residual voltage by proportional adjustment within a first width adjustment range (which may be determined according to the specific circumstances of the charging device) based on the current pulse width of the residual voltage and a voltage error value, where the voltage error value is the difference between the current voltage value of the residual voltage and a predetermined voltage value.

[0048] For example, in one exemplary embodiment, the first width adjustment range for a charging device may be 30 μs-500 μs, and the residual voltage pulse width may be adjusted to a smaller value within the range of 30 μs-500 μs by proportional adjustment.

[0049] 3) If the residual voltage does not drop to a predetermined voltage value even when the pulse width is adjusted to the lower limit, adjust the residual voltage dead time to a smaller value.

[0050] In the embodiments of the present invention, dead time adjustment refers to adjustment of the dead time. The dead time refers to the dead time of a switching power supply in a charging device. Unlike linear power supplies, switching of transistor states in a switching power supply is typically performed between a fully open mode (saturation region) and a fully closed mode (off region). A protection period must be provided to avoid a current surge caused by two or more push-pull connected transistors being turned on simultaneously. For example, in the case of a PWM pulse signal generator, the dead time refers to a protection period provided to prevent the insulated gate bipolar transistors (IGBTs) of the upper and lower arms from being turned on simultaneously due to the switching speed during PWM output. This is also commonly referred to as PWM response time.

[0051] If the residual voltage has not yet dropped to the predetermined voltage value even when the pulse width is adjusted to the minimum width, the discharge rate may be further increased by shortening the dead time of the residual voltage through width adjustment. Although dead time adjustment results in the lowest waveform stability compared to frequency adjustment and width adjustment, if neither frequency adjustment nor width adjustment is effective (i.e., it is difficult to drop the residual voltage to the predetermined voltage value), further adjustment by dead time adjustment may be performed to further increase the discharge rate.

[0052] Of course, if the residual voltage can be made to drop to a predetermined voltage value before the pulse width is adjusted to the lower limit of the first width adjustment range, or when the pulse width is adjusted to the lower limit of the first width adjustment range, then it is possible to achieve fast and safe discharge without further adjustment.

[0053] In some embodiments of the present invention, adjusting the residual voltage dead time to a smaller value may include adjusting the residual voltage dead time by proportionally adjusting the residual voltage pulse width to a smaller value based on the current residual voltage pulse width and voltage error value within a second width adjustment range (which may be determined according to the specific circumstances of the charging equipment).

[0054] For example, in one exemplary embodiment, the second width adjustment range of a charging device is 400 μs-3 μs, and the dead time of the residual voltage may be adjusted by adjusting the pulse width of the residual voltage to a smaller value within the range of 400 μs-3 μs.

[0055] In the embodiment of the present invention, during the dead time adjustment, the current value of the discharge circuit may be detected in real time, and when the current value of the discharge circuit exceeds the current threshold, the discharge circuit is temporarily turned off to prevent damage to the discharge load and further improve the safety of the residual voltage discharge.

[0056] In some embodiments of the present invention, controlling the discharge load connected in parallel with the output terminal to form a discharge circuit may include determining whether the residual voltage at the output terminal reaches a voltage threshold, and controlling the discharge load connected in parallel with the output terminal to form a discharge circuit when the residual voltage at the output terminal reaches the voltage threshold. In this way, the residual voltage can be quickly and safely discharged only when it becomes high, thereby protecting the safety of personnel and charging equipment. Residual voltages with relatively low voltage values ​​are unlikely to pose a risk to personnel or charging equipment, and can be naturally discharged by a capacitive element in the main circuit of the charging equipment, which is advantageous in reducing the cost of residual voltage discharge control.

[0057] In some other embodiments of the present invention, the charge / discharge control method for a charging device may further include performing constant current control and / or constant voltage control on a charging signal during the charging process. Here, constant current control is a charging control method in which current is maintained at a constant value. Performing constant current control is advantageous for improving the charging speed of an electric vehicle. Constant voltage control is a charging control method in which voltage is maintained at a constant value. Performing constant voltage control is advantageous for charging the voltage across the secondary battery of an electric vehicle to a rated voltage. In other words, performing constant voltage control allows the secondary battery of an electric vehicle to be fully charged (i.e., charged to a fully charged state). Preferably, during the charging process, the voltage of the secondary battery of the electric vehicle may first be brought close to the rated voltage using constant current control, and then charging may be performed using constant voltage control until the secondary battery of the electric vehicle is fully charged. In this way, the secondary battery of the electric vehicle can be quickly fully charged.

[0058] As shown in FIG. 4, in some embodiments of the present invention, performing constant voltage control on the charging signal in the charging process may include the following steps:

[0059] Step S401: Voltage sampling and filtering is performed.

[0060] Here, the sampling and filtering of the voltage refers to the sampling and filtering of the charging voltage, and the implementation process thereof may be referred to the sampling process for the residual voltage described above, and therefore, the description thereof will be omitted here.

[0061] Step S402: The frequency is adjusted.

[0062] The purpose of adjusting the frequency and / or width and adjusting the dead time in constant voltage control is to achieve a constant voltage control effect, that is, to fully charge the secondary battery of the electric vehicle.

[0063] In the present invention, frequency adjustment refers to frequency adjustment for the charging voltage. For frequency adjustment for the charging voltage, please refer to the process of frequency adjustment for the residual voltage described above, and a detailed description will be omitted here. The difference is that proportional-integral adjustment is used when adjusting the frequency of the charging voltage.

[0064] Step S403: The width is adjusted.

[0065] The width adjustment in the present embodiment refers to pulse width adjustment for the charging voltage. For width adjustment for the charging voltage, please refer to the process of width adjustment for the residual voltage described above, and the description will be omitted here.

[0066] In step S404, the dead time is adjusted.

[0067] The dead time adjustment in the embodiment of the present invention refers to the adjustment of the dead time of the switching power supply in the charging equipment. For the dead time adjustment, the above-mentioned process related to the dead time adjustment can be referred to, and the description thereof will be omitted here.

[0068] In the embodiment of the present invention, during the process of adjusting the frequency and / or width of the constant voltage control and the dead time, the current value of the charging current may be detected in real time, and whether the current value exceeds a current threshold may be determined in real time. If the current value of the charging current exceeds the current threshold, the charging output may be temporarily stopped to prevent damage to the discharging load, which is advantageous in further improving charging safety.

[0069] In the constant voltage control of the embodiment shown in FIG. 4, adjustments are made in the order of frequency adjustment → width adjustment → dead time adjustment, which is advantageous in maintaining waveform stability during the charging process and can improve charging safety.

[0070] As shown in FIG. 5, in some embodiments of the present invention, performing constant current control on the charging signal in the charging process may include the following steps:

[0071] Step S501: Current sampling and filtering is performed.

[0072] The current sampling and filtering here refers to the sampling and filtering of the charging current, and the implementation process can be referred to the sampling process for the residual voltage described above, and the description will be omitted here. The difference is that in this step, the charging current is collected instead of the residual voltage.

[0073] Step S502: The frequency is adjusted.

[0074] The purpose of frequency regulation and width regulation in constant current control is to achieve the effect of constant current control, that is, to realize fast charging of electric vehicles.

[0075] The frequency adjustment in the embodiment of the present invention refers to the frequency adjustment of the charging current. Here, the frequency adjustment of the charging current can be referred to the process of frequency adjustment of the residual voltage described above, and the description will be omitted here. The difference is that the proportional-integral adjustment is used when adjusting the frequency of the charging current.

[0076] Step S503: The width is adjusted.

[0077] The width adjustment in the embodiment of the present invention refers to pulse width adjustment for the charging current, where the width adjustment for the charging current can be referred to the width adjustment process for the residual voltage described above, and the description thereof will be omitted here.

[0078] In an embodiment of the present invention, in the process of adjusting the frequency and width of the above-mentioned constant current control, if the current value of the charging current exceeds the current threshold, the charging output may be temporarily stopped to prevent damage to the discharge load, which is also advantageous for further improving charging safety.

[0079] In the constant current control of the embodiment shown in FIG. 5, adjustment is performed in the order of frequency adjustment → width adjustment, which is also advantageous in maintaining waveform stability during the charging process and improving charging safety.

[0080] Other embodiments of the present invention further provide another charge / discharge control method applicable to the charging device side. As shown in Figure 6, the charge / discharge control method may include the following steps: S601: Turn on the charging circuit.

[0081] As shown in Figure 1, when charging an electric vehicle, the output terminal of the charging device is removed and inserted into the charging port of the electric vehicle to perform charging docking. After charging docking is completed, the charging circuit of the charging device is turned on, and the charging device starts charging the secondary battery of the electric vehicle.

[0082] S602: Rapidly charge the electric vehicle using a constant current control method.

[0083] Generally, when the secondary battery of an electric vehicle needs to be charged when its remaining capacity is relatively low, the entire charging process generally takes a relatively long time. In order to improve the charging speed and shorten the charging time, charging may be performed first using a constant current control method.

[0084] S603: The electric vehicle is fully charged using a constant voltage control method.

[0085] When the voltage across the secondary battery of the electric vehicle reaches a certain set value, the charging control method may be switched from constant current control to constant voltage control in order to fully charge the electric vehicle.

[0086] S604: Turn off the charging circuit.

[0087] In many cases, turning off the charging circuit may refer to automatically turning off the charging circuit in the charging device after the secondary battery of the electric vehicle is fully charged to prevent overcharging and extend the service life of the secondary battery. At this time, the output terminal of the charging device may still be docked with the charging port of the electric vehicle, but the charging operation of the charging device has already stopped. Of course, in some special circumstances, the charging circuit may be turned off because charging is manually terminated before completion (i.e., the output terminal of the charging device is forcibly pulled out from the charging port of the electric vehicle) due to, for example, a user's desire to use the vehicle immediately (or for other reasons).

[0088] S605: Obtain the residual voltage at the output end after the charging circuit is turned off.

[0089] S606: A discharge circuit is formed by controlling a discharge load connected in parallel with the output terminal.

[0090] S607: Adjust the frequency and / or width and / or dead time for the residual voltage so as to increase the discharge speed of the discharge circuit.

[0091] For steps S605 to S607, the explanation of the relevant parts above can be referred to, and the explanation will be omitted here.

[0092] In this way, the charge / discharge control method shown in FIG. 6 not only enables rapid full charging of the secondary battery of an electric vehicle, shortens the charging time of the electric vehicle, and improves the charging efficiency of the electric vehicle, but also quickly and safely releases the residual voltage at the output end after the charging circuit is turned off, thereby improving the safety of personnel and charging equipment.

[0093] Although the process flows described above include multiple operations in a particular order, it will be appreciated that these processes may include more or fewer operations, and that these operations may be performed sequentially or in parallel (e.g., using parallel processors or a multi-threaded environment).

[0094] As shown in FIG. 7 , in some embodiments of the present invention, the charging device 702 may include one or more processors 704, such as a central processing unit (CPU) or a graphics processor (GPU), and each processor may implement one or more hardware threads. The charging device 702 may further include an optional memory 706 for storing any type of information, such as code, settings, data, etc. In a specific embodiment, the memory 706 stores a computer program executable by the processor 704, and when the computer program is executed by the processor 704, instructions of the charging / discharging control method described in any of the above embodiments may be executed. Without limitation, the memory 706 may include, for example, any type of RAM, any type of ROM, flash memory, a hard disk, an optical disk, or any combination thereof. More generally, the optional memory may store information using any technology. Furthermore, the optional memory may store information in a volatile or non-volatile manner. The optional memory may also refer to a removable component of the charging device 702. In one aspect, the charging device 702 may perform any operation based on the associated instructions stored in any memory or combination of memories when executed by the processor 704. The charging device 702 may further include one or more drive mechanisms 708, such as a hard disk drive mechanism, an optical disk drive mechanism, or the like, for communicating with any memory.

[0095] The charging device 702 may also include an input / output interface 710 (I / O) that accepts various inputs (via input devices 712) and various outputs (via output devices 714). The output mechanism may specifically include a presentation device 716 and an associated graphical user interface 718 (GUI). In other embodiments, the charging device 702 may not include the input / output interface 710 (I / O), the input devices 712, and the output devices 714 and may be used solely as a charging device within a network. The charging device 702 may further include one or more network interfaces 720 for exchanging data with other devices via one or more communication links 722. The above-mentioned components are interconnected by one or more communication buses 724.

[0096] The communications link 722 may be implemented in any manner, such as a local area network, a wide area network (e.g., the Internet), a point-to-point connection, or any combination thereof. The communications link 722 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc., capable of supporting any protocol or combination of protocols.

[0097] In the above description of the charging device, for convenience of explanation, the functions of the units have been described separately. Of course, when implementing the present invention, the functions of the units may be realized by the same or multiple pieces of software and / or hardware.

[0098] The present invention has been described with reference to flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to some embodiments of the specification. Each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, may be implemented by computer program instructions. These computer program instructions may be provided to a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processor to implement an apparatus, such that the instructions executed by the computer or other programmable data processor generate an apparatus for implementing a predetermined function in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0099] These computer program instructions may be stored in a computer-readable memory that causes a computer or other programmable data processor to operate in a particular manner, and the instructions stored in the computer-readable memory may generate an instruction apparatus that implements a predetermined function in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0100] These computer program instructions may be loaded into a computer or other programmable data processor and may execute a series of operational steps on the computer or other programmable device to generate a computer-implemented process, such that the instructions executing on the computer or other programmable device provide steps for implementing a predetermined function in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0101] In a typical configuration, the charging device includes one or more processors (CPUs), input / output interfaces, a network interface, and memory.

[0102] The memory may include a volatile memory such as random access memory (RAM) and / or a non-volatile memory such as read only memory (ROM) and flash memory (flash RAM) in a computer-readable medium. The memory is an example of a computer-readable medium.

[0103] Computer-readable media may include nonvolatile and volatile media, removable and non-removable media. These media may implement information storage using any method or technology. Information may be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, cassette tape, disk storage or other magnetic storage, or other non-transmission media used to store information accessible from a charging device. As defined herein, computer-readable media does not include transitory computer-readable media such as modulated data signals and carrier waves.

[0104] It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, a system, or a computer program product. Accordingly, embodiments of the present invention may be implemented entirely in hardware, entirely in software, or a combination of software and hardware. Furthermore, embodiments of the present invention may be realized as a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk memory, CD-ROM, optical memory, etc.) having computer-usable program code written thereon.

[0105] Embodiments of the invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Typically, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Embodiments of the invention may also be practiced in distributed computing environments where tasks are performed by remote processors that are linked through a communications network. In a distributed computing environment, program modules may be included in both local and remote computer storage media, including storage devices.

[0106] In the embodiments of the present invention, the term "and / or" is merely used to describe the association of related objects. For example, A and / or B can indicate three relationships: A exists alone, A and B exist together, and B exists alone.

[0107] Each embodiment of the present invention is described in a progressive manner, with similarities between embodiments referred to in each other, and each embodiment is described with a focus on the differences from other embodiments. In particular, the system embodiments are generally similar to the method embodiments, and therefore the description will be simplified, and relevant portions may refer to the description of the method embodiments. In describing the present invention, the use of terms such as "one embodiment," "several embodiments," "examples," "specific examples," or "several examples" means that specific features, structures, materials, or characteristics described in the embodiment or examples are included in at least one embodiment or example of the present invention. In this specification, general expressions using the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, unless mutually inconsistent, those skilled in the art may combine or combine different embodiments or examples and features of different embodiments or examples described herein.

[0108] The above is merely an example of the present invention and is not intended to limit the present invention. Those skilled in the art can make various modifications and variations to the present invention. Any modifications, equivalent replacements, improvements, etc. based on the spirit and principles of the present invention are all included within the scope of the claims of this application.

Claims

1. Obtaining a residual voltage at the output end after the charging circuit is turned off; forming a discharge circuit by controlling a discharge load connected in parallel with the output terminal; adjusting a frequency, a pulse width, and / or a dead time of the residual voltage so as to increase the discharge speed of the discharge circuit; performing a frequency adjustment on the residual voltage includes significantly adjusting a pulse frequency of the residual voltage; adjusting the pulse width of the residual voltage includes adjusting the pulse width of the residual voltage to be smaller when the residual voltage has not dropped to a predetermined voltage value even when the pulse frequency has been adjusted to the upper frequency limit, adjusting the dead time for the residual voltage includes adjusting the dead time for the residual voltage to be smaller when the residual voltage has not dropped to the predetermined voltage value even when the pulse width has been adjusted to the width lower limit. A charge / discharge control method comprising:

2. Obtaining the residual voltage at the output terminal includes: obtaining voltage samples from the output terminal for a plurality of consecutive periods to generate a series of voltage samples; calculating an average value of a middle portion of the voltage sampling value series as a residual voltage at the output terminal; 2. The charge / discharge control method according to claim 1.

3. Increasing the pulse frequency of the residual voltage and adjusting the residual voltage pulse frequency by proportional adjustment within a predetermined frequency adjustment range.

2. The charge / discharge control method according to claim 1.

4. The pulse width of the residual voltage is adjusted to be small. adjusting the pulse width of the residual voltage by proportional adjustment according to the current pulse width of the residual voltage and the voltage error value within the first width adjustment range; The voltage error value is the difference between the current voltage value of the residual voltage and the predetermined voltage value.

2. The charge / discharge control method according to claim 1.

5. The dead time of the residual voltage is adjusted to be small. adjusting the dead time of the residual voltage by proportionally adjusting the pulse width of the residual voltage according to the current pulse width of the residual voltage and the voltage error value within the second width adjustment range; The voltage error value is the difference between the current voltage value of the residual voltage and the predetermined voltage value.

2. The charge / discharge control method according to claim 1.

6. adjusting the frequency of the residual voltage and further comprising turning off the discharge circuit when a current value of the discharge circuit exceeds a current threshold.

2. The charge / discharge control method according to claim 1.

7. forming a discharge circuit by controlling a discharge load connected in parallel with the output terminal, Determining whether the residual voltage at the output terminal reaches a voltage threshold; When the residual voltage of the output terminal reaches a voltage threshold, controlling a discharge load connected in parallel with the output terminal to form a discharge circuit.

2. The charge / discharge control method according to claim 1.

8. The resistance value of the discharge load is smaller than the equivalent resistance value of the main circuit of the charging device.

2. The charge / discharge control method according to claim 1.

9. Further comprising performing constant current control and constant voltage control on the charging signal during the charging process.

2. The charge / discharge control method according to claim 1.

10. A charging device comprising a memory, a processor, and a computer program stored in the memory, The instructions of the method according to any one of claims 1 to 9 are carried out when the computer program is executed by the processor. A charging device characterized by:

11. A computer storage medium on which a computer program is stored, The instructions of the method according to any one of claims 1 to 9 are carried out when the computer program is executed by a processor of a charging device. A computer storage medium comprising:

12. A computer program comprising: The instructions of the method according to any one of claims 1 to 9 are carried out when the computer program is executed by a processor. A computer program characterized by:

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