Charging / discharging control methods, charging devices, and storage devices.

Abstract

The invention relates to the technical field of charging devices for electric vehicles, providing a method for controlling charging and discharging, a charging device and a storage device, the method comprising the steps: obtaining the output residual voltage after the charging circuit is disconnected; controlling a discharge load connected in parallel with the output to form a discharge circuit; performing frequency adjustment and / or width adjustment and / or dead zone adjustment on the residual voltage to increase the discharge rate of the discharge circuit. According to the invention, the residual voltage on the charging device side can be rapidly and safely discharged after the charging circuit is disconnected.

Description

Charging and discharging control method, charging device and storage medium

[0001] This application claims priority to Chinese patent application No. 202110839708.6, filed on July 23, 2021, entitled “Charging and Discharging Control Method, Charging Device and Storage Medium,” the entire contents of which are incorporated by reference into this application. Technical Field

[0002] This specification relates to the technical field of charging equipment for electric vehicles, and in particular to a charging and discharging control method, charging equipment, and storage medium. Background Art

[0003] To meet the widespread demand for fast charging of electric vehicles and to save time and costs, charging equipment typically requires high charging power. However, because charging equipment often contains capacitive components, the charging voltage on the charging device side cannot be immediately released after the charging circuit is disconnected. This means that residual voltage is easily generated on the charging device side, potentially harmful to both personnel and the charging device. Therefore, how to quickly and safely release the residual voltage on the charging device side after disconnecting the charging circuit has become a pressing technical challenge.

[0004] Summary of the Invention

[0005] The purpose of the embodiments of this specification is to provide a charge and discharge control method, apparatus, device, and storage medium to quickly and safely release the residual voltage on the charging device side after disconnecting the charging circuit.

[0006] To achieve the above objectives, on the one hand, an embodiment of this specification provides a charge and discharge control method, including:

[0007] After disconnecting the charging circuit, obtain the residual voltage at the output terminal;

[0008] controlling a discharge load connected in parallel with the output terminal to form a discharge loop;

[0009] The residual voltage is subjected to frequency adjustment and / or width adjustment and / or dead zone adjustment to accelerate the discharge speed of the discharge circuit.

[0010] In a preferred embodiment of the present specification, the obtaining of the residual voltage at the output terminal includes:

[0011] Acquiring a plurality of consecutive cycles of voltage sampling values ​​of the output end to form a voltage sampling value sequence;

[0012] An average value of a middle portion of the voltage sampling value sequence is calculated, and the average value is used as the residual voltage at the output end.

[0013] In a preferred embodiment of the present specification, the frequency adjustment and / or width adjustment and / or dead zone adjustment of the residual voltage includes:

[0014] Adjust the pulse frequency of the residual voltage upward;

[0015] If the residual voltage still does not drop to the specified voltage value when the pulse frequency is adjusted to the upper frequency limit, then the pulse width of the residual voltage is adjusted downward;

[0016] If the residual voltage still does not drop to the specified voltage value when the pulse width is adjusted to the lower limit of the width, the dead time of the residual voltage is adjusted downward.

[0017] In a preferred embodiment of the present specification, the step of upwardly adjusting the pulse frequency of the residual voltage includes:

[0018] Within the specified frequency adjustment range, the pulse frequency of the residual voltage is adjusted upward using proportional adjustment.

[0019] In a preferred embodiment of the present specification, the step of downwardly adjusting the pulse width of the residual voltage includes:

[0020] In the first width adjustment range, the pulse width of the residual voltage is adjusted downward in a proportional manner according to the current pulse width of the residual voltage and the voltage error value; the voltage error value is the difference between the current voltage value of the residual voltage and the specified voltage value.

[0021] In a preferred embodiment of the present specification, the step of downwardly adjusting the dead time of the residual voltage includes:

[0022] Within the second width adjustment range, the pulse width of the residual voltage is downward adjusted in a proportional manner according to the current pulse width of the residual voltage and the voltage error value to adjust the dead time of the residual voltage; the voltage error value is the difference between the current voltage value of the residual voltage and the specified voltage value.

[0023] In a preferred embodiment of the present specification, the frequency adjustment and / or width adjustment and / or dead zone adjustment of the residual voltage further includes:

[0024] When the current value of the discharge circuit exceeds a current threshold, the discharge circuit is disconnected.

[0025] In a preferred embodiment of the present specification, the controlling the discharge load connected in parallel with the output terminal to form a discharge loop includes:

[0026] Determining whether the residual voltage at the output terminal reaches a voltage threshold;

[0027] When the residual voltage at the output terminal reaches a voltage threshold, a discharge load connected in parallel with the output terminal is controlled to form a discharge loop.

[0028] In a preferred embodiment of the present specification, the resistance of the discharge load is smaller than the equivalent resistance of the main circuit of the charging device.

[0029] In a preferred embodiment of this specification, the method further includes:

[0030] During the charging process, the charging signal is controlled by constant current and constant voltage.

[0031] On the other hand, an embodiment of this specification further provides a charging device, comprising a memory, a processor, and a computer program stored in the memory, wherein the computer program executes instructions of the above method when executed by the processor.

[0032] On the other hand, an embodiment of this specification further provides a computer storage medium having a computer program stored thereon, wherein the computer program executes the instructions of the above method when executed by the processor of the charging device.

[0033] On the other hand, an embodiment of this specification further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the instructions of the above method are executed.

[0034] It can be seen from the technical solutions provided in the above embodiments of this specification that, in the embodiments of this specification, after the charging circuit is disconnected, the charging device can obtain the residual voltage at the output end, and control the discharge load in parallel with the output end to form a discharge circuit, so that the residual voltage can be released through the discharge circuit. In this process, the charging device can also accelerate the discharge speed of the discharge circuit by adjusting the frequency and / or width and / or dead zone of the residual voltage, thereby enabling the residual voltage at the output end to be released quickly and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some of the embodiments described in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0036] FIG1 shows a schematic diagram of a charging device in some embodiments of this specification;

[0037] FIG2 shows a circuit block diagram of a charging device in some embodiments of this specification;

[0038] FIG3 shows a flow chart of a charge and discharge control method in some embodiments of this specification;

[0039] FIG4 shows a flow chart of constant voltage control of a charging signal during charging in some embodiments of this specification;

[0040] FIG5 shows a flow chart of constant current control of a charging signal during a charging process in some embodiments of this specification;

[0041] FIG6 shows a flow chart of a charge and discharge control method in some other embodiments of this specification;

[0042] FIG7 shows a structural block diagram of a charging device in some embodiments of this specification.

[0043] [Description of Reference Numerals]

[0044] 100. Charging equipment;

[0045] 11. Output terminal;

[0046] 12. Main circuit of charging equipment;

[0047] 13. Discharge load;

[0048] 14. Controllable switch;

[0049] 702. Charging equipment;

[0050] 704, processor;

[0051] 706. Memory;

[0052] 708, driving mechanism;

[0053] 710, input / output interface;

[0054] 712. Input devices;

[0055] 714. Output device;

[0056] 716. Presentation equipment;

[0057] 718. Graphical User Interface;

[0058] 720, network interface;

[0059] 722, communication link;

[0060] 724. Communication bus. DETAILED DESCRIPTION

[0061] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the embodiments described are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification. For example, in some descriptions, forming a second component above a first component may include an embodiment in which the first component and the second component are formed in direct contact, and may also include an embodiment in which the first component and the second component are formed in non-direct contact (that is, additional components may be included between the first component and the second component), etc.

[0062] Moreover, for ease of description, some embodiments of this specification may use spatially relative terms such as "above," "below," "top," and "below" to describe the relationship between one element or component and another (or other) elements or components as shown in the drawings of the embodiments. It should be understood that in addition to the orientations described in the drawings, the spatially relative terms are also intended to include different orientations of the device during use or operation. For example, if the device in the drawings is turned over, the element or component described as "below" or "beneath" other elements or components will then be positioned "above" or "on" the other elements or components.

[0063] The electric vehicle charging equipment in the embodiments of this specification is commonly known as a charging pile, etc. To solve the problem in the prior art that it is difficult to quickly and safely release the residual voltage on the charging equipment side after disconnecting the charging circuit, an improved charging equipment is provided in the embodiments of this specification.

[0064] As shown in FIG1 , in some embodiments of the present specification, the charging device 100 may be provided with one or more output terminals 11. The output terminal 11 may be used to connect to the charging port of an electric vehicle to charge the electric vehicle. In conjunction with FIG2 , the main circuit 12 of the charging device may be connected in parallel with a discharge load 13 (e.g., a purely resistive circuit such as a discharge resistor) to release the residual voltage; the discharge load 13 may be connected in series with a controllable switch 14, which is controlled by a processor (or controller) of the charging device, i.e., the processor of the charging device may send a control signal to the controllable switch 14 to control the opening and closing of the controllable switch 14. Specifically, when the control signal is a closing signal, the controllable switch 14 is closed, the discharge load 13 forms a discharge circuit, and the residual voltage can be released through the discharge circuit; when the control signal is an opening signal, the controllable switch 14 is opened, the discharge load 13 is open, and the residual voltage cannot be released through the discharge load 13.

[0065] Given the negative correlation between the discharge speed of the discharge circuit and discharge safety, the discharge speed of the discharge circuit should not be too high to prevent overheating of the discharge load 13 and the resulting danger. Therefore, in the embodiments of this specification, the processor of the charging device can, after disconnecting the charging circuit, obtain the residual voltage at the output terminal, control the discharge load to form a discharge circuit, and perform frequency adjustment and / or width adjustment and / or dead-band adjustment on the residual voltage to accelerate the discharge speed of the discharge circuit, thereby achieving the purpose of quickly and safely releasing the residual voltage. The specific implementation of frequency adjustment and / or width adjustment and / or dead-band adjustment on the residual voltage will be described below.

[0066] Preferably, in other embodiments of the present specification, in order to facilitate rapid release of residual voltage, the resistance of the discharge load 13 may be smaller than the equivalent resistance of the main circuit 12 of the charging device.

[0067] Referring to FIG3 , in some embodiments of this specification, the charging and discharging control method of the charging device may include the following steps:

[0068] S301 : After disconnecting the charging circuit, obtain the residual voltage at the output end.

[0069] S302: Control a discharge load connected in parallel with the output end to form a discharge loop.

[0070] S303: Perform frequency adjustment and / or width adjustment and / or dead zone adjustment on the residual voltage to accelerate the discharge speed of the discharge circuit.

[0071] In the embodiments of this specification, after the charging circuit is disconnected, the charging device can obtain the residual voltage at the output end and control the discharge load connected in parallel with the output end to form a discharge circuit, so that the residual voltage can be released through the discharge circuit. During this process, the charging device can also accelerate the discharge speed of the discharge circuit by frequency adjustment and / or width adjustment and / or dead zone adjustment of the residual voltage, thereby achieving the rapid and safe release of the residual voltage at the output end.

[0072] In some embodiments of this specification, obtaining the residual voltage at the output terminal may include the following steps:

[0073] 1) Acquire voltage sampling values ​​of the output end for a plurality of consecutive cycles to form a voltage sampling value sequence.

[0074] The term "period" refers to the period of the voltage signal at the output. The voltage signal from a charging device is typically a periodic signal, such as a pulse width modulation (PWM) signal. The charging device may be equipped with a voltage sampling module and a current sampling module. The voltage sampling module can acquire multiple consecutive periods of voltage sampling values ​​at the output.

[0075] 2) Calculating the mean value of the middle part of the voltage sampling value sequence, and using the mean value as the residual voltage at the output end.

[0076] During the voltage sampling process, there may be problems such as electromagnetic noise. Therefore, the mean of the middle part of the voltage sampling value sequence can be used as the residual voltage at the output end to facilitate obtaining a more accurate residual voltage value. In this way, the residual voltage is sampled and filtered.

[0077] For example, in an exemplary embodiment, the output terminal voltage values ​​of 10 cycles can be continuously collected and arranged in order of size to form a voltage sampling value sequence; 4 to 6 voltage sampling values ​​located in the middle part of the voltage sampling value sequence are taken out and their average is calculated as the current residual voltage value of the output terminal.

[0078] In some embodiments of this specification, the frequency adjustment and / or width adjustment and / or dead zone adjustment of the residual voltage may include the following steps:

[0079] 1) Adjust the pulse frequency of the residual voltage upward.

[0080] The purpose of upward adjustment (i.e., increasing) of the residual voltage pulse frequency is to increase the discharge current, thereby accelerating the discharge rate. Compared with width adjustment (i.e., pulse width adjustment) and dead-band adjustment, frequency adjustment can make the discharge signal waveform more stable. In other words, frequency adjustment is safer and more effective than width adjustment and dead-band adjustment. Therefore, when adjusting the residual voltage, the residual voltage frequency can be prioritized.

[0081] In some embodiments of this specification, upwardly adjusting the residual voltage pulse frequency may include upwardly adjusting the residual voltage pulse frequency using a proportional adjustment method within a specified frequency adjustment range (the specified frequency adjustment range may be determined based on the specific conditions of the charging device). For example, in one exemplary embodiment, for a charging device with a frequency adjustment range of 85 kHz to 165 kHz, the residual voltage pulse frequency may be upwardly adjusted within the range of 85 kHz to 165 kHz.

[0082] In some embodiments of this specification, during the frequency adjustment process, the current value of the discharge circuit can be detected in real time, and whether it exceeds a current threshold can be determined in real time. When the current value of the discharge circuit exceeds the current threshold, the discharge circuit can be temporarily disconnected to prevent damage to the discharge load, thereby improving the safety of residual voltage release.

[0083] 2) If the residual voltage still does not drop to the specified voltage value when the pulse frequency is adjusted to the upper frequency limit, the pulse width of the residual voltage is adjusted downward.

[0084] If the residual voltage still hasn't dropped to a specified voltage value (which can be set based on actual needs, such as 36V) after the pulse frequency is adjusted to the upper frequency limit, the residual voltage pulse width can be adjusted downward (i.e., reduced). This is done to further accelerate discharge speed through width adjustment. While width adjustment offers slightly less waveform stability than frequency adjustment, it's superior to dead-band adjustment. Therefore, if frequency adjustment alone fails to reduce the residual voltage to the specified voltage value, width adjustment can be used as a next best option to further accelerate discharge speed.

[0085] Of course, if the residual voltage can be reduced to the specified voltage value before the pulse frequency is adjusted to the upper frequency limit or when the pulse frequency is adjusted to the upper frequency limit, rapid and safe discharge can be achieved without further adjustment.

[0086] In the embodiments of this specification, during the aforementioned width adjustment process, the current value of the discharge circuit can also be detected in real time. When the current value of the discharge circuit exceeds a current threshold, the discharge circuit can be temporarily disconnected to prevent damage to the discharge load, thereby further improving the safety of residual voltage release.

[0087] In some embodiments of the present specification, downwardly adjusting the pulse width of the residual voltage may include downwardly adjusting the pulse width of the residual voltage using a proportional adjustment method based on a current pulse width of the residual voltage and a voltage error value within a first width adjustment range (the first width adjustment range may be determined based on the specific conditions of the charging device). The voltage error value is the difference between the current voltage value of the residual voltage and a specified voltage value.

[0088] For example, in an exemplary embodiment, the first width adjustment range of a certain charging device is 30 μs to 500 μs. Within the range of 30 μs to 500 μs, the pulse width of the residual voltage can be adjusted downward using a proportional adjustment method.

[0089] 3) If the residual voltage still does not drop to the specified voltage value when the pulse width is adjusted to the lower limit of the width, the dead time of the residual voltage is adjusted downward.

[0090] In the embodiments of this specification, dead time adjustment refers to the adjustment of dead time. The dead time refers to the dead time of the switching power supply in the charging device. The switching power supply is different from the linear power supply. The transistor state switching of the switching power supply is usually switched between the full-on mode (saturation region) and the full-closed mode (cut-off region). In order to avoid the current surge caused by the simultaneous conduction of two or more transistors in a push-pull connection, a protection period needs to be set. For example, taking a PMW pulse signal generator as an example, the dead time refers to: in order to prevent the upper and lower bridge arm insulated gate bipolar transistors (IGBT) from being turned on at the same time due to switching speed issues during PWM output, a protection period is set, which usually also refers to the PWM response time.

[0091] If the residual voltage still hasn't dropped to the specified voltage value after the pulse width is adjusted to the lower limit, the residual voltage deadband time can be adjusted downward to further accelerate the discharge speed through width adjustment. Compared with frequency adjustment and width adjustment, deadband adjustment has the worst waveform stability. However, when frequency adjustment and width adjustment are both ineffective (i.e., it is difficult to reduce the residual voltage to the specified voltage value), deadband adjustment can be used to further accelerate the discharge speed.

[0092] Of course, if the residual voltage can be reduced to the specified 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, rapid and safe discharge can be achieved without further adjustment.

[0093] In some embodiments of the present specification, the dead time of downwardly adjusting the residual voltage may include: within a second width adjustment range (the second width adjustment range may also be determined based on the specific circumstances of the charging device), according to the current pulse width of the residual voltage and the voltage error value, using a proportional adjustment method to downwardly adjust the pulse width of the residual voltage to adjust the dead time of the residual voltage.

[0094] For example, in an exemplary embodiment, the second width adjustment range of a certain charging device is 400ns-3μs. Within the range of 400ns-3μs, the dead time of the residual voltage can be adjusted by downwardly adjusting the pulse width of the residual voltage.

[0095] In the embodiments of this specification, during the dead-band adjustment process, the current value of the discharge circuit can also be detected in real time. When the current value of the discharge circuit exceeds a current threshold, the discharge circuit can be temporarily disconnected to prevent damage to the discharge load, thereby further improving the safety of residual voltage release.

[0096] In some embodiments of this specification, 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 has reached a voltage threshold; and when the residual voltage at the output terminal reaches the voltage threshold, controlling the discharge load connected in parallel with the output terminal to form a discharge circuit. This allows only the residual voltage with higher voltage values ​​to be quickly and safely discharged to protect personnel and charging equipment. For residual voltage with lower voltage values, since it is less likely to pose a hazard to personnel and charging equipment, it can be naturally discharged by utilizing capacitive elements in the main circuit of the charging equipment, thereby reducing the cost of residual voltage discharge control.

[0097] In other embodiments of the present specification, the charge and discharge control method of the charging device may further include: performing constant current control and / or constant voltage control on the charging signal during the charging process. Among them, constant current control refers to a charging control method in which the current is maintained at a constant value; performing constant current control can help to increase the charging speed of the electric vehicle. Constant voltage control refers to a charging control method in which the voltage is maintained at a constant value; performing constant voltage control can help to charge the voltage across the rechargeable battery of the electric vehicle to the rated voltage; in other words, performing constant voltage control can fully charge the rechargeable battery of the electric vehicle (i.e., charge it to a fully charged state). Preferably, during the charging process, a constant current control method can be first used to make the voltage of the rechargeable battery of the electric vehicle close to the rated voltage, and then constant voltage control can be used to continue charging until the rechargeable battery of the electric vehicle is fully charged. In this way, it can be beneficial to quickly fully charge the rechargeable battery of the electric vehicle.

[0098] Referring to FIG. 4 , in some embodiments of this specification, performing constant voltage control on the charging signal during the charging process may include the following steps:

[0099] Step S401: voltage sampling and filtering.

[0100] The voltage sampling filtering here refers to the sampling filtering of the charging voltage. The implementation process can be found in the above-mentioned sampling and processing process of the residual voltage, which will not be repeated here.

[0101] Step S402: frequency adjustment.

[0102] The purpose of frequency regulation and / or width regulation and dead-band regulation in constant voltage control is to achieve a constant voltage control effect, that is, to fully charge the rechargeable battery of the electric vehicle.

[0103] The frequency regulation in the embodiments of this specification refers to the frequency regulation of the charging voltage. The frequency regulation of the charging voltage can be referred to the process of frequency regulation of the residual voltage described above and will not be repeated here. The difference is that the proportional-integral regulation method is used when regulating the frequency of the charging voltage.

[0104] Step S403: Width adjustment.

[0105] The width adjustment in the embodiment of this specification refers to the pulse width adjustment of the charging voltage. For the width adjustment of the charging voltage, reference can be made to the process of width adjustment of the residual voltage above, which will not be repeated here.

[0106] Step S404: Dead zone adjustment.

[0107] The dead zone adjustment in the embodiment of this specification refers to the adjustment of the dead zone time of the switching power supply in the charging device. The dead zone adjustment can refer to the processing process of the dead zone adjustment part above, which will not be repeated here.

[0108] In the embodiments of this specification, during the frequency adjustment and / or width adjustment and dead-band adjustment processes of the constant voltage control described above, the charging current value can also be detected in real time, and a determination can be made in real time whether the current value exceeds a current threshold. When the charging current value exceeds the current threshold, the charging output can be suspended to prevent damage to the discharge load, thereby further improving charging safety.

[0109] In the constant voltage control of the embodiment shown in FIG4 , adjustments are performed in the order of priority of frequency adjustment → width adjustment → dead zone adjustment, which can help maintain waveform stability during charging, thereby improving charging safety.

[0110] Referring to FIG. 5 , in some embodiments of this specification, performing constant current control on the charging signal during the charging process may include the following steps:

[0111] Step S501: Current sampling and filtering.

[0112] The current sampling and filtering here refers to the sampling and filtering of the charging current. Its implementation process can be referred to the sampling and processing process of the residual voltage above, and will not be repeated here. The difference is that the object of collection in this step is the charging current rather than the residual voltage.

[0113] Step S502: Frequency adjustment.

[0114] The purpose of frequency regulation and width regulation in constant current control is to achieve constant current control effect, that is, to achieve fast charging of electric vehicles.

[0115] The frequency regulation in the embodiments of this specification refers to the frequency regulation of the charging current. The frequency regulation of the charging current can be referred to as the frequency regulation process for the residual voltage described above, and will not be repeated here. The difference is that the proportional-integral regulation method is used when regulating the frequency of the charging current.

[0116] Step S503: Width adjustment.

[0117] The width adjustment in the embodiment of this specification refers to the pulse width adjustment of the charging current. For the width adjustment of the charging current, reference can be made to the process of width adjustment of the residual voltage above, which will not be repeated here.

[0118] In the embodiments of this specification, during the frequency adjustment and width adjustment process of the above-mentioned constant current control, when the current value of the charging current exceeds the current threshold, the charging output can be suspended to prevent damage to the discharge load, thereby further improving charging safety.

[0119] In the constant current control of the embodiment shown in FIG5 , adjustments are performed in the order of priority of frequency adjustment → width adjustment, which is also to help maintain waveform stability during charging, thereby improving charging safety.

[0120] In other embodiments of this specification, another charge and discharge control method is provided, which can be applied to the charging device side. Referring to Figure 6, the charge and discharge control method may include the following steps:

[0121] S601: Connect the charging circuit.

[0122] As shown in Figure 1, when charging an electric vehicle, the output terminal of the charging device can be removed and inserted into the charging port of the electric vehicle for charging docking. When charging docking is completed, the charging device is connected to the charging circuit and the charging device begins to charge the rechargeable battery of the electric vehicle.

[0123] S602. Use a constant current control method to quickly charge the electric vehicle.

[0124] Generally, the remaining power of the rechargeable battery of an electric vehicle is low before it needs to be charged; therefore, the entire charging process generally takes a relatively long time. In order to increase the charging speed and shorten the charging time, a constant current control method can be used for charging.

[0125] S603: Charge the electric vehicle to full capacity using a constant voltage control method.

[0126] When the voltage across the rechargeable battery of an electric vehicle reaches a certain set value, in order to fully charge the electric vehicle, the charging control mode can be switched from constant current control to constant voltage control.

[0127] S604: Disconnect the charging circuit.

[0128] In most cases, disconnecting the charging circuit means that, to prevent overcharging and extend the life of the rechargeable battery, the charging device automatically disconnects the charging circuit after the electric vehicle's rechargeable battery is fully charged. At this point, the output terminal of the charging device may still be connected to the electric vehicle's charging port, but the charging device has stopped charging. Of course, in some special cases, if the user is in a hurry to use the vehicle (or for other reasons), and manually terminates charging before it is complete (i.e., the output terminal of the charging device is forcibly unplugged from the electric vehicle's charging port before charging is complete), this can also cause the charging circuit to be disconnected.

[0129] S605: After disconnecting the charging circuit, obtain the residual voltage at the output end.

[0130] S606: Control a discharge load connected in parallel with the output end to form a discharge loop.

[0131] S607: Perform frequency adjustment and / or width adjustment and / or dead zone adjustment on the residual voltage to accelerate the discharge speed of the discharge circuit.

[0132] For steps S605 to S607, please refer to the description of the relevant parts above and will not be repeated here.

[0133] In this way, based on the charge and discharge control method shown in Figure 6, not only can the rechargeable battery of the electric vehicle be quickly fully charged, thereby shortening the charging time of the electric vehicle and improving the charging efficiency of the electric vehicle; it can also quickly and safely release the residual voltage at the output end after disconnecting the charging circuit, thereby improving the safety of people and charging equipment.

[0134] Although the process flows described above include multiple operations occurring in a particular order, it should be understood that these processes may include more or fewer operations, which may be performed sequentially or in parallel (eg, using parallel processors or a multi-threaded environment).

[0135] As shown in FIG. 7 , in some embodiments of the present disclosure, the charging device 702 may include one or more processors 704, such as one or more central processing units (CPUs) or graphics processing units (GPUs). Each processing unit may implement one or more hardware threads. The charging device 702 may also include any memory 706 for storing any type of information, such as code, settings, data, etc. In one specific embodiment, the memory 706 may contain a computer program executable by the processor 704. When executed by the processor 704, the computer program may execute instructions of the charge and discharge control method described in any of the above embodiments. For example, and without limitation, the memory 706 may include any one or more combinations of the following: any type of RAM, any type of ROM, a flash memory device, a hard disk, an optical disk, etc. More generally, any memory may use any technology to store information. Furthermore, any memory may provide volatile or non-volatile retention of information. Furthermore, any memory may represent a fixed or removable component of the charging device 702. In one embodiment, when the processor 704 executes the associated instructions stored in any memory or combination of memories, the charging device 702 may perform any operation of the associated instructions. The charging device 702 also includes one or more drive mechanisms 708 for interacting with any storage, such as a hard drive mechanism, an optical drive mechanism, and the like.

[0136] The charging device 702 may also include an input / output interface 710 (I / O) for receiving various inputs (via input device 712) and for providing various outputs (via output device 714). A specific output mechanism may include a presentation device 716 and an associated graphical user interface 718 (GUI). In other embodiments, the input / output interface 710 (I / O), input device 712, and output device 714 may not be included, and the charging device 702 may serve as only one charging device in the network. The charging device 702 may also include one or more network interfaces 720 for exchanging data with other devices via one or more communication links 722. One or more communication buses 724 couple the components described above together.

[0137] The communication link 722 may be implemented in any manner, for example, via a local area network, a wide area network (e.g., the Internet), a point-to-point connection, etc., or any combination thereof. The communication link 722 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc., governed by any protocol or combination of protocols.

[0138] For the convenience of description, the above description of the charging device is divided into various units according to their functions and described separately. Of course, when implementing this specification, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0139] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products of some embodiments of this specification. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processing machine, or other programmable data processor to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processor produce a device for implementing the function specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0140] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processor to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0141] These computer program instructions can also be loaded onto a computer or other programmable data processor so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0142] In a typical configuration, a charging device includes one or more processors (CPUs), input / output interfaces, a network interface, and memory.

[0143] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0144] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can 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 technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a charging device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0145] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems, or computer program products. Therefore, the embodiments of this specification may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the embodiments of this specification may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0146] Embodiments of this specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, and the like that perform specific tasks or implement specific abstract data types. Embodiments of this specification may also be practiced in distributed computing environments where tasks are performed by remote processors connected via a communications network. In distributed computing environments, program modules may be located in local and remote computer storage media, including storage devices.

[0147] It should also be understood that in the embodiments of the present invention, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0148] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between the various embodiments can be referenced across them. Each embodiment focuses on the differences from the other embodiments. In particular, since the system embodiments are generally similar to the method embodiments, their description is relatively simple. For relevant parts, reference can be made to the description of the method embodiments. Throughout this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the embodiments in this specification. In this specification, the schematic representations of these 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 suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate the different embodiments or examples, and features of different embodiments or examples, described in this specification, without conflict.

[0149] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A charge and discharge control method, characterized in that: include: After disconnecting the charging circuit, obtain the residual voltage at the output terminal; controlling a discharge load connected in parallel with the output terminal to form a discharge loop; The residual voltage is subjected to frequency adjustment and / or width adjustment and / or dead zone adjustment to accelerate the discharge speed of the discharge circuit.

2. The charge and discharge control method according to claim 1, wherein: The obtaining of the residual voltage at the output terminal includes: Acquiring a plurality of consecutive cycles of voltage sampling values ​​of the output end to form a voltage sampling value sequence; An average value of a middle portion of the voltage sampling value sequence is calculated, and the average value is used as the residual voltage at the output end.

3. The charge and discharge control method according to claim 1, wherein: The frequency adjustment and / or width adjustment and / or dead zone adjustment of the residual voltage includes: Adjust the pulse frequency of the residual voltage upward; If the residual voltage still does not drop to the specified voltage value when the pulse frequency is adjusted to the upper frequency limit, then the pulse width of the residual voltage is adjusted downward; If the residual voltage still does not drop to the specified voltage value when the pulse width is adjusted to the lower limit of the width, the dead time of the residual voltage is adjusted downward.

4. The charge and discharge control method according to claim 3, wherein: The step of upwardly regulating the pulse frequency of the residual voltage comprises: Within the specified frequency adjustment range, the pulse frequency of the residual voltage is adjusted upward using proportional adjustment.

5. The charge and discharge control method according to claim 3, wherein: The step of downwardly adjusting the pulse width of the residual voltage comprises: In the first width adjustment range, the pulse width of the residual voltage is adjusted downward in a proportional manner according to the current pulse width of the residual voltage and the voltage error value; the voltage error value is the difference between the current voltage value of the residual voltage and the specified voltage value.

6. The charge and discharge control method according to claim 3, wherein: The dead time of downwardly regulating the residual voltage includes: Within the second width adjustment range, the pulse width of the residual voltage is downward adjusted in a proportional manner according to the current pulse width of the residual voltage and the voltage error value to adjust the dead time of the residual voltage; the voltage error value is the difference between the current voltage value of the residual voltage and the specified voltage value.

7. The charge and discharge control method according to claim 3, wherein: The frequency adjustment and / or width adjustment and / or dead zone adjustment of the residual voltage further includes: When the current value of the discharge circuit exceeds a current threshold, the discharge circuit is disconnected.

8. The charge and discharge control method according to claim 1, wherein: The controlling the discharge load connected in parallel with the output terminal to form a discharge loop includes: Determining whether the residual voltage at the output terminal reaches a voltage threshold; When the residual voltage at the output terminal reaches a voltage threshold, a discharge load connected in parallel with the output terminal is controlled to form a discharge loop.

9. The charge and discharge control method according to claim 1, wherein: The resistance of the discharge load is smaller than the equivalent resistance of the main circuit of the charging device.

10. The charge and discharge control method according to claim 1, wherein: Also includes: During the charging process, the charging signal is controlled by constant current and constant voltage.

11. A charging device comprising a memory, a processor, and a computer program stored in the memory, characterized in that: When the computer program is executed by the processor, the computer program executes the instructions of the method according to any one of claims 1 to 10.

12. A computer storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor of a charging device, the computer program executes instructions of the method according to any one of claims 1 to 10.

13. 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 computer program executes instructions of the method according to any one of claims 1 to 10.

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