Charging system, control method, electronic device, vehicle, and computer program product

Abstract

The invention relates to the technical field of charging, and particularly discloses a charging system, a control method, an electronic device, a vehicle and a computer program product. The charging system comprises a charger, a DC / DC converter module and a controller. The input end of the charger is connected with the AC power supply and the output end is connected with the battery. The DC / DC converter module comprises a DC / DC converter, a first capacitor and a second capacitor. The input end of the DC / DC converter is connected in parallel with the first capacitor, and the output end is connected in parallel with the second capacitor and is connected in parallel with the output end of the charger on the battery. And the DC / DC converter module is controlled to be switched between a boost mode and a buck mode. When the output current IOBC of the charger is smaller than the charging average current IAV, the DC / DC converter module is in a voltage reduction mode, and the current IDC of the output end of the DC / DC converter is in the first direction. And when the output current IOBC of the charger is greater than the charging average current IAV, the controller controls the DC / DC converter module to be in a boost mode, and the current IDC of the output end of the DC / DC converter is in a second direction opposite to the first direction.

Description

Technical Field

[0001] The present application relates to the field of charging technology, and particularly to a charging system, a control method, an electronic device, a vehicle, and a computer program product. Background Art

[0002] On-board chargers are important components in new energy vehicles. To meet market demands, some on-board chargers eliminate large-capacity electrolytic capacitors, enabling on-board chargers to develop towards low cost and high power density.

[0003] However, since some on-board chargers eliminate large-capacity electrolytic capacitors, the output current of the on-board charger is alternating current containing power frequency components, resulting in the Battery Management System (BMS) being unable to accurately calculate the State of Charge (SOC), thereby affecting the BMS's judgment of the battery's power state. Summary of the Invention

[0004] In view of the above problems, the present application discloses a charging system, a control method, an electronic device, a vehicle, and a computer program product.

[0005] In a first aspect, the present application provides a charging system, which includes a charger, a DC / DC converter module, and a controller. The input end of the charger is connected to an AC power supply, and the output end of the charger is configured to be connected to a battery. The DC / DC converter module includes a DC / DC converter, a first capacitor, and a second capacitor. The input end of the DC / DC converter is connected in parallel with the first capacitor, the output end of the DC / DC converter is connected in parallel with the second capacitor, and the output end of the DC / DC converter and the output end of the charger are connected in parallel to the battery. The controller is connected to the DC / DC converter module and is configured to control the DC / DC converter module to switch between a boost mode and a buck mode. When the output current I OBC of the charger is less than the average charging current I AV for the charger to charge the battery, the controller controls the DC / DC converter module to be in the buck mode, and the current I DC at the output end of the DC / DC converter is in a first direction; when the output current I OBC of the charger is greater than the average charging current I AV the controller controls the DC / DC converter module to be in the boost mode, and the current I DC at the output end of the DC / DC converter is in a second direction, and the first direction is opposite to the second direction.

[0006] In some embodiments, when the DC / DC converter module is in the step-down mode, the voltage of the first capacitor is greater than the voltage of the second capacitor, the first direction is the direction of outflow from the output end of the DC / DC converter, and the output current of the DC / DC converter is equal to the average charging current I AV The output current I of the charger OBC When the DC / DC converter module is in the boost mode, the voltage of the first capacitor is greater than the voltage of the second capacitor, the second direction is the direction of flowing from the outside into the output end of the DC / DC converter, and the input current of the DC / DC converter is equal to the output current I of the charger. OBC With the average charging current I AV The difference between .

[0007] In some embodiments, the controller includes a PID controller and a PWM modulation controller. The PID controller is connected to the output end of the DC / DC converter module and is configured to: obtain a reference current I REF and the current I at the output end of the DC / DC converter DC , obtain the reference current I REF The output current I of the DC / DC converter DC The reference current I REF The average charging current I AV The output current I of the charger OBC The PWM modulation controller is connected to the PID controller and is configured to: modulate the control voltage to generate a control signal for controlling the working mode of the DC / DC converter module, wherein the working mode includes the boost mode and the buck mode.

[0008] In some embodiments, the charger includes a single-stage topology or a multi-stage topology, and the output current I OBC For alternating current.

[0009] In some embodiments, the charger includes a primary switch module, a transformer, a secondary switch module and a bus capacitor. The primary switch module is connected to both the AC power supply and the transformer. The transformer includes a primary winding and a secondary winding, the primary winding is connected to the primary switch module, the secondary switch module is connected between the secondary winding and the bus capacitor, and the output end of the secondary switch module and the output end of the DC / DC converter are connected in parallel to the battery.

[0010] In some embodiments, the primary side switching module includes a primary side capacitor, a primary side inductor, and a first bridge arm array connected in parallel. The first bridge arm array includes a first switch bridge arm, a second switch bridge arm, a third switch bridge arm, and a fourth switch bridge arm connected in parallel. Two primary side switching tube units in the same direction are respectively connected in series on the first switch bridge arm, the second switch bridge arm, the third switch bridge arm, and the fourth switch bridge arm. The primary side switching tube unit includes a diode and a switch connected in parallel. The AC power supply is connected to the common node of the first switch bridge arm and the second switch bridge arm. The primary side winding and the primary side inductor are connected in series and then connected together to the common node of the third switch bridge arm and the fourth switch bridge arm. The secondary side switching module includes a second bridge arm array connected in parallel with the bus capacitor. The second bridge arm array includes a fifth switch bridge arm and a sixth switch bridge arm connected in parallel. The secondary side winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm. Two secondary side switching tube units in the same direction are respectively connected in series on the fifth switch bridge arm and the sixth switch bridge arm. The secondary side switching tube unit includes a diode and a switch connected in parallel. The secondary side winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm.

[0011] In some embodiments, the primary side switching module includes a first primary side inductor, a second primary side inductor, a primary side capacitor, and a first bridge arm array connected in parallel. The first bridge arm array includes a first switch bridge arm, a second switch bridge arm, and a third switch bridge arm connected in parallel. Two primary side switching tube units in the same direction are respectively connected in series on the first switch bridge arm, the second switch bridge arm, and the third switch bridge arm. The primary side switching tube unit includes a diode and a switch connected in parallel. The first primary side inductor and the AC power supply are connected in series and then connected to the common node of the first switch bridge arm and the second switch bridge arm. The second primary side inductor and the AC power supply are connected in series and then connected to the common node of the first switch bridge arm and the third switch bridge arm. The primary side winding is connected to the common node of the first switch bridge arm and the second switch bridge arm. The secondary side switching module includes a secondary side inductor and a second bridge arm array connected in parallel with the bus capacitor. The second bridge arm array is connected in parallel with the secondary side capacitor and includes a fourth switch bridge arm and a fifth switch bridge arm connected in parallel. Two secondary side switching tube units in the same direction are respectively connected in series on the fourth switch bridge arm and the fifth switch bridge arm. The secondary side switching tube unit includes a diode and a switch connected in parallel. The secondary side inductor and the secondary side winding are connected in series and then connected together to the common node of the fourth switch bridge arm and the fifth switch bridge arm.

[0012] In some embodiments, the primary side switching module includes a primary side inductor, and a primary side capacitor and a first bridge arm array connected in parallel. The first bridge arm array includes a first switch bridge arm, a second switch bridge arm, a third switch bridge arm, and a fourth switch bridge arm connected in parallel. Two primary side switch tube units in the same direction are respectively connected in series on the third switch bridge arm and the fourth switch bridge arm. The primary side switch tube unit includes a diode and a switch connected in parallel. Two of the switches are respectively connected in series on the first switch bridge arm and the second switch bridge arm. The AC power supply is connected to the common node of the first switch bridge arm and the second switch bridge arm. The primary side winding and the primary side inductor are connected in series and then together connected to the common node of the third switch bridge arm and the fourth switch bridge arm. The secondary side switching module includes a second bridge arm array connected in parallel with the bus capacitor. The second bridge arm array includes a fifth switch bridge arm and a sixth switch bridge arm connected in parallel. Two secondary side switch tube units in the same direction are respectively connected in series on the fifth switch bridge arm and the sixth switch bridge arm. The secondary side switch tube unit includes a diode and a switch connected in parallel. The secondary side winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm.

[0013] In some embodiments, the primary side switching module includes a first primary side inductor, a second primary side inductor, a capacitor unit connected in parallel, and a first bridge arm array. The capacitor unit includes two capacitors connected in series. The first bridge arm array includes a first switch bridge arm and a second switch bridge arm connected in parallel. Two primary side switch tube units in the same direction are respectively connected in series on the first switch bridge arm and the second switch bridge arm. The primary side switch tube unit includes a diode and a switch connected in parallel. The AC power supply and the first primary side inductor are connected in series and then together connected to the common node of the first switch bridge arm and the second switch bridge arm. The primary side winding and the second primary side inductor are connected in series and then together connected to the common node of the first switch bridge arm and the capacitor unit. The secondary side switching module includes a second bridge arm array connected in parallel with the bus capacitor. The second bridge arm array includes a third switch bridge arm and a fourth switch bridge arm connected in parallel. The secondary side winding is connected to the common node of the third switch bridge arm and the fourth switch bridge arm. Two secondary side switch tube units in the same direction are respectively connected in series on the third switch bridge arm and the fourth switch bridge arm. The secondary side switch tube unit includes a diode and a switch connected in parallel.

[0014] In some embodiments, the primary side switching module includes a primary side inductor and a first bridge arm array. The first bridge arm array includes a first switching bridge arm and a second switching bridge arm connected in parallel. Four switching tube units with sequentially opposite directions are respectively connected in series on the first switching bridge arm and the second switching bridge arm. The switching tube unit includes a diode and a switching tube connected in parallel. The primary side inductor is connected in series with the primary side winding and then connected to the common node of the first switching bridge arm and the second switching bridge arm together. The secondary side switching module includes a second bridge arm array connected in parallel with the bus capacitor. The second bridge arm array includes a third switching bridge arm and a fourth switching bridge arm connected in parallel. Two secondary side switching tube units with the same direction are respectively connected in series on the third switching bridge arm and the fourth switching bridge arm. The secondary side switching tube unit includes a diode and a switching tube connected in parallel. The secondary side winding is connected to the common node of the third switching bridge arm and the fourth switching bridge arm.

[0015] In some embodiments, the DC / DC converter includes a first switching tube unit, a second switching tube unit, and an adjusting inductor. Both the first switching tube unit and the second switching tube unit include a diode and a switching tube connected in parallel. The first switching tube unit and the second switching tube unit are connected in series and then connected in parallel with the first capacitor. The first end of the adjusting inductor is connected to the intermediate node where the first switching tube unit and the second switching tube unit are connected. The second end of the adjusting inductor is connected to both the charger and the battery. One end of the second capacitor is connected to the second end of the adjusting inductor. The second end of the second capacitor is also connected to the intermediate node where the first capacitor and the second switching tube unit are connected, and is connected to both the charger and the battery. When the output current I OBC of the charger is less than the average charging current I AV , the controller outputs a first control signal to control the duty cycle of the first switching tube unit to adjust the output current of the DC / DC converter; when the output current I OBC of the charger is greater than the average charging current I AV , the controller outputs a second control signal to control the duty cycle of the second switching tube unit to adjust the input current of the DC / DC converter.

[0016] In some embodiments, the charging system includes two parallel DC / DC converters, and the second ends of the adjusting inductors in the two DC / DC converters are connected to each other.

[0017] In some embodiments, the DC / DC converter only serves the charging system.

[0018] In some embodiments, the DC / DC converter serves the charging system and functional modules in the vehicle other than the charging system, and the operating time of the DC / DC converter serving the functional modules is staggered from the operating time of serving the charging system.

[0019] In some embodiments, the functional modules include the motor controllers of the vehicle, and the motor controllers include a generating motor controller and a driving motor controller.

[0020] In a second aspect, a control method applicable to the charging system according to any one of the above embodiments is provided. The control method includes: when the output current I of the charger OBC is less than the average charging current I AV , controlling the DC / DC converter module to be in the buck mode, and the current I at the output end of the DC / DC converter DC is in the first direction. When the output current I of the charger OBC is greater than the average charging current I AV , controlling the DC / DC converter module to be in the boost mode, and the current I at the output end of the DC / DC converter DC is in the second direction, and the first direction is opposite to the second direction.

[0021] In some embodiments, when the DC / DC converter module is in the buck mode, the voltage of the first capacitor is greater than the voltage of the second capacitor, the first direction is the direction flowing out from the output end of the DC / DC converter, and the magnitude of the output current of the DC / DC converter is the difference between the average charging current I AV and the output current I of the charger OBC . When the DC / DC converter module is in the boost mode, the voltage of the first capacitor is greater than the voltage of the second capacitor, the second direction is the direction flowing into the output end of the DC / DC converter from the outside, and the magnitude of the input current of the DC / DC converter is the difference between the output current I of the charger OBC and the average charging current I AV .

[0022] In a third aspect, an electronic device is provided. The electronic device includes one or more processors and a memory. When the computer program stored in the memory is executed by the processor, the steps in the method according to any one of the above embodiments are implemented.

[0023] In a fourth aspect, a vehicle is provided. The vehicle includes any one of the charging systems or includes the electronic device.

[0024] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps in the method described in any of the above embodiments.

[0025] In the charging system, control method, electronic device, vehicle, and computer program product of the present application, the charger is usually connected to an AC power supply. Therefore, the output current I of the charger OBC contains a power frequency component, and the waveform is a pulsating bun-shaped wave. In the charging system according to the embodiments of the present application, the output terminal of the charger and the output terminal of the DC / DC converter module are connected in parallel to the battery. The input terminal and the output terminal of the DC / DC converter are respectively connected in parallel to the first capacitor and the second capacitor, and the DC / DC converter can be switched between two different operating modes, namely, a buck mode and a boost mode, under the control of a controller. Specifically, when the output current I of the charger OBC is less than the average charging current I AV , the controller controls the DC / DC converter module to be in the buck mode, so as to discharge through the first capacitor and the second capacitor to supplement the output current I of the charger OBC , so that the current for charging the battery is a direct current with a magnitude equal to the average charging current I AV ; when the output current I of the charger OBC is greater than the average charging current I AV , the controller controls the DC / DC converter module to be in the boost mode, so as to store at least part of the output current I of the charger through the first capacitor and the second capacitor OBC , so that the current for charging the battery is a direct current with a magnitude equal to the average charging current I AV . Therefore, the charging current finally output by the charging system of the present application to the battery is a smooth direct current, and subsequently, the BMS can accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system.

[0026] Some additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings: Figure 1 is a schematic flowchart of the control method according to some embodiments of the present application; Figure 2 It is a schematic structural diagram of a charging system according to some embodiments of the present application; Figure 3 It is a schematic structural diagram of the output current of a charger in a charging system according to some embodiments of the present application; Figure 4 It is a schematic structural diagram of a controller in a charging system according to some embodiments of the present application; Figure 5 It is a schematic structural diagram of a charging system according to some embodiments of the present application; Figure 6 It is a schematic structural diagram of a charger in a charging system according to some embodiments of the present application; Figure 7 It is a schematic structural diagram of a charger in a charging system according to some embodiments of the present application; Figure 8 It is a schematic structural diagram of a charger in a charging system according to some embodiments of the present application; Figure 9 It is a schematic structural diagram of a charger in a charging system according to some embodiments of the present application; Figure 10 It is a schematic structural diagram of a charging system according to some embodiments of the present application; Figure 11 It is a schematic structural diagram of an electronic device according to some embodiments of the present application; Figure 12 It is the structure of a vehicle according to some embodiments of the present application; Figure 13 It is a schematic diagram of the connection state between a computer program product and a processor according to some embodiments of the present application.

[0028] The reference numerals in the specific embodiments are as follows: Charging system 10; Charger 11; Primary side switch module 111; Transformer 113; Secondary side switch module 115; Bus capacitor 117; DC / DC converter module 13; DC / DC converter 131; First switch tube unit Q13; Second switch tube unit Q14; Regulation inductor L2; First capacitor 133; Second capacitor 135; Controller 15; Motor controller 30; Generator motor controller 31; Drive motor controller 33; Engine motor 40; Drive motor 60; Electronic device 100; Processor 50; Memory 70; Vehicle 1000; Computer program product 200; Computer program 202. Specific embodiments

[0029] In the description of the present application, some of the disclosed content has been correspondingly shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The content described by referring to the drawings below is exemplary and is only used to explain the present application, and should not be construed as a limitation to the present application.

[0030] In the description of the present application, many different contents or examples are disclosed to implement different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application.

[0031] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0032] In the description of the present application, it should be understood that the terms used to indicate the orientation or positional relationship (such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc.) are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and facilitating the understanding of the corresponding embodiments, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to indicate the orientation or positional relationship should not be construed as a limitation to the present application.

[0033] In the description of the present application, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0034] On-board chargers are used to charge high-voltage power batteries and are important components in new energy vehicles. To meet market demands, on-board chargers are developing towards lower cost and higher power density. Existing on-board chargers mostly adopt a two-stage topology structure. There is a large-capacity electrolytic capacitor between the front-stage AC / DC and the rear-stage DC / DC, making the output current of the on-board charger a smooth DC current. In recent years, a single-stage topology structure for on-board chargers has emerged, eliminating the large-capacity electrolytic capacitor. At the same time, there are also on-board chargers with a two-stage topology structure that eliminate the electrolytic capacitor, thereby reducing the cost of the on-board charger and increasing the power density. However, due to the elimination of the large-capacity electrolytic capacitor, the AC current output by the on-board charger contains a power frequency component, and the current waveform is a flat-topped wave.

[0035] Therefore, when the single-stage topology on-board charger or the two-stage topology on-board charger that eliminates the large-capacity electrolytic capacitor charges the power battery, the output current is pulsating, resulting in the BMS being unable to accurately calculate the SOC, thus affecting the BMS's judgment of the battery charge state. To solve this problem, the present application provides a charging system ( Figure 2 as shown), a control method ( Figure 1 as shown), an electronic device ( Figure 11 as shown), a vehicle ( Figure 12 as shown), and a computer program product ( Figure 13 as shown).

[0036] Please refer to Figure 1 and Figure 2 , the control method provided by the present application includes: 01: When the output current I OBC of the charger 11 is less than the average charging current I AV , control the DC / DC converter module 13 to be in the buck mode, and the current I DC at the output end of the DC / DC converter 131 is in the first direction; 03: When the output current I OBC of the charger 11 is greater than the average charging current I AV , control the DC / DC converter module 13 to be in the boost mode, and the current I DC at the output end of the DC / DC converter 131 is in the second direction, and the first direction is opposite to the second direction.

[0037] Specifically, the above control method can be applied to the charging system 10. Specifically, the charging system 10 includes a charger 11, a DC / DC converter module 13, and a controller 15. The input end of the charger 11 is connected to an AC power supply, and the output end of the charger 11 is configured to be connected to a battery. The DC / DC converter module 13 includes a DC / DC converter 131, a first capacitor 133, and a second capacitor 135. The input end of the DC / DC converter 131 is connected in parallel with the first capacitor 133, the output end of the DC / DC converter 131 is connected in parallel with the second capacitor 135, and the output end of the DC / DC converter 131 and the output end of the charger 11 are connected in parallel to the battery. The controller 15 is connected to the DC / DC converter module 13 and is configured to control the DC / DC converter module 13 to switch between a boost mode and a buck mode. When the output current I of the charger 11 OBC is less than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the buck mode, and the current I at the output end of the DC / DC converter 131 DC is in the first direction; when the output current I of the charger 11 OBC is greater than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the boost mode, and the current I at the output end of the DC / DC converter 131 DC is in the second direction, and the first direction is opposite to the second direction.

[0038] Please refer to Figure 2 and Figure 3 . In the method of 01, the input end of the charger 11 is connected to an AC power supply to allow high-frequency alternating current to enter the charger 11. The high-frequency alternating current can be 220V or high-frequency alternating current with other voltage values. The output end of the charger 11 is configured to be connected to a battery, and the charging system 10 supplies the output current I of the charger 11 OBC to the battery through the output end of the charger 11 to achieve charging of the battery by the charger 11. The average charging current I of the charger 11 for charging the battery AV refers to the ratio of the charging power of the charger 11 for charging the battery to the voltage of the battery being charged by the charger 11. The average charging current I AV is determined by the nature of the charger 11 itself and the voltage of the battery being charged by the charger 11. When the output current I of the charger 11 OBC is less than the average charging current I AVIn this case, the controller 15 will control the DC / DC converter 131 to enter the buck mode. This control process can be that the original mode (initial mode) of the DC / DC converter 131 is the buck mode, and the controller 15 does not control the mode switching of the DC / DC converter 131, or the original mode (initial mode) of the DC / DC converter 131 is the boost mode, and the controller 15 controls the DC / DC converter 131 to be switched to the buck mode. The output terminal of the DC / DC converter 131 is connected in parallel with the output terminal of the charger 11 to the battery. At this time, in the buck mode, relative to the battery, the direction of the current I DC at the output terminal of the DC / DC converter 131 is the same as the direction of the current at the output terminal of the charger 11, and the direction of the current I DC at the output terminal of the DC / DC converter 131 is the first direction.

[0039] Please refer to Figure 2 and Figure 3 , in the method of 03, the input terminal of the charger 11 is connected to the AC power supply so that the high-frequency alternating current enters the charger 11. The high-frequency alternating current can be 220V or high-frequency alternating current of other voltage values. The output terminal of the charger 11 is configured to be connected to the battery, and the charging system 10 supplies the output current I OBC of the charger 11 to the battery through the output terminal of the charger 11 to achieve charging of the battery. When the output current I OBC of the charger 11 is greater than the average charging current I AV , the controller 15 will control the DC / DC converter 131 to enter the boost mode. This control process can be: the original mode (initial mode) of the DC / DC converter 131 is the boost mode, and the controller 15 does not control the mode switching of the DC / DC converter 131, or the original mode (initial mode) of the DC / DC converter 131 is the buck mode, and the controller 15 controls the DC / DC converter 131 to be switched to the boost mode. The output terminal of the DC / DC converter 131 is connected in parallel with the output terminal of the charger 11 to the battery. At this time, in the boost mode, relative to the battery, the direction of the current I DC at the output terminal of the DC / DC converter 131 is not the same as the direction of the current at the output terminal of the charger 11, and the direction of the current I DC at the output terminal of the DC / DC converter 131 is the second direction, and the first direction and the second direction are opposite to the DC / DC converter 131.

[0040] The charger 11 is usually connected to the AC power supply. Therefore, the output current I OBC of the charger 11 contains a power frequency component, and the waveform is a pulsating mantou wave, as shown in Figure 3as shown by the curve in. In the charging system 10 applying the control method of the present application, the output terminal of the charger 11 and the output terminal of the DC / DC converter module 13 are connected in parallel to the battery. The input terminal and the output terminal of the DC / DC converter 131 are respectively connected in parallel with the first capacitor 133 and the second capacitor 135, and the DC / DC converter 131 can switch between two different operating modes, namely the buck mode and the boost mode, under the control of the controller 15. Specifically, when the output current I of the charger 11 OBC is less than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the buck mode, so as to discharge outward through the first capacitor 133 and the second capacitor 135 to supplement the output current I of the charger 11 OBC , so that the current for charging the battery is a direct current with a magnitude equal to the average charging current I AV . When the output current I of the charger 11 OBC is greater than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the boost mode, so as to store at least part of the output current I of the charger 11 through the first capacitor 133 and the second capacitor 135 OBC , so that the current for charging the battery is a direct current with a magnitude equal to the average charging current I AV . Therefore, the charging current finally output by the charging system 10 of the present application to the battery is a smooth direct current (as shown by the straight line in the dotted line in Figure 3 ), and the subsequent BMS can accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system 10.

[0041] Please continue to refer to Figure 2 . In some embodiments, when the DC / DC converter module 13 is in the buck mode, the voltage of the first capacitor 133 is greater than the voltage of the second capacitor 135. The first direction is the direction flowing out from the output terminal of the DC / DC converter 131, and the magnitude of the output current of the DC / DC converter 131 is the difference between the average charging current I AV and the output current I of the charger 11 OBC . When the DC / DC converter module 13 is in the boost mode, the voltage of the first capacitor 133 is greater than the voltage of the second capacitor 135. The second direction is the direction flowing into the output terminal of the DC / DC converter 131 from the outside, and the magnitude of the input current of the DC / DC converter 131 is the difference between the output current I of the charger 11 OBC and the average charging current I AV .

[0042] Specifically, when the DC / DC converter module 13 is in the buck mode, the voltage of the first capacitor 133 is greater than the voltage of the second capacitor 135, and the first direction refers to the current I at the output terminal of the DC / DC converter 131 DC flowing out from the output terminal of the DC / DC converter 131 and flowing towards the common node of the DC / DC converter 131, the charger 11 and the battery ( Figure 2 where I DC is the rightward direction downward). At this time, the output current of the DC / DC converter 131 supplements the current at the output terminal of the charger 11. Moreover, the magnitude of the output current of the DC / DC converter 131 is the difference between the average charging current I AV and the output current I OBC of the charger 11. At this time, the input current of the battery is the DC current formed by the superposition of the current I at the output terminal of the DC / DC converter 131 DC and the current at the output terminal of the charger 11, and the magnitude of the input current of the battery is equal to the magnitude of the average charging current I AV .

[0043] When the DC / DC converter module 13 is in the boost mode, the voltage of the first capacitor 133 is greater than the voltage of the second capacitor 135, and the second direction refers to the current I at the output terminal of the DC / DC converter 131 DC flowing from the common node of the charger 11 and the battery into the output terminal of the DC / DC converter 131 ( Figure 2 where I DC is the leftward direction downward). At this time, the output current of the DC / DC converter 131 absorbs the current at the output terminal of the charger 11. Moreover, the magnitude of the output current of the DC / DC converter 131 is the difference between the average charging current I AV and the output current I OBC of the charger 11. At this time, the input current of the battery is the DC current formed by the superposition of the current I at the output terminal of the DC / DC converter 131 DC and the current at the output terminal of the charger 11, and the magnitude of the input current of the battery is equal to the magnitude of the average charging current I AV .

[0044] Please refer to Figure 2 and Figure 4 together. In some embodiments, the controller 15 includes a PID controller and a PWM modulation controller. The PID controller is connected to the output terminal of the DC / DC converter module 13 and is configured to: obtain the reference current I REF and the current I DC at the output terminal of the DC / DC converter 131, obtain the reference current I REFThe current I at the output end of the DC / DC converter 131 DC The difference δI between them is processed to generate a control voltage. REF is the average charging current I AV The output current I of the charger 11 OBC The PWM modulation controller is connected to the PID controller and is configured to: modulate the control voltage to generate a control signal for controlling the working mode of the DC / DC converter module 13, the working mode including a boost mode and a buck mode.

[0045] In the above embodiment, the controller 15 is used to control the current I at the output end of the DC / DC converter module 13. DC The output current I of the charger 11 is OBC Supplement or absorb until the current is equal to the average charging current I AV The current size of the DC current is the purpose of the DC / DC converter module 13. DC is a vector, which can be the current input to the DC / DC converter module 13 or the current output from the DC / DC converter module 13. The PID controller is connected to the output end of the DC / DC converter module 13 and obtains the reference current I REF , the current I at the output end of the DC / DC converter 131 DC , and the reference current I REF The current I at the output end of the DC / DC converter 131 DC The difference δI between them is used to adjust the current I at the output end of the DC / DC converter 131 through a combination of three links: proportional (Proportional, P), integral (Integral, I) and derivative (Derivative, D). DC The PWM modulation controller generates a control signal for controlling the working mode of the DC / DC converter module 13 according to the control voltage provided by the PID controller, so that the DC / DC converter module 13 switches between the boost mode and the buck mode.

[0046] Please refer to Figures 5 to 9 In some embodiments, the charger 11 includes a single-stage topology (e.g. Figures 5 to 9 As shown) or a multi-level topology (not shown), the output current I OBC For alternating current.

[0047] A charger with a single-stage topology without large electrolytic capacitors or a charger with a multi-stage topology without large electrolytic capacitors has the advantages of simple structure, low cost and high power density, and can better meet the market demand. However, since no large electrolytic capacitors are provided, the output current I of the above-mentioned charger with a single-stage topology or a multi-stage topology OBC is alternating current, which causes the BMS to be unable to accurately obtain the SOC, thus affecting the BMS's judgment of the battery's state of charge. In the case of adopting the charging system 10 and control method of the present application, the current I at the output end of the DC / DC converter 131 DC supplements or absorbs the output current I of the charger 11 OBC so that without setting large electrolytic capacitors, the charging current finally output by the charging system 10 to the battery can be a smooth direct current, which can output the same direct current to the battery as a charger with a multi-stage topology that directly outputs direct current, and avoids the above problems while having the above advantages.

[0048] Please refer to Figure 5 , in some embodiments, the charger 11 includes a primary side switch module 111, a transformer 113, a secondary side switch module 115 and a bus capacitor 117. The primary side switch module 111 is connected to an AC power supply and the transformer 113. The transformer 113 includes a primary winding and a secondary winding. The primary winding is connected to the primary side switch module 111. The secondary side switch module 115 is connected between the secondary winding and the bus capacitor 117. The output end of the secondary side switch module 115 is connected in parallel with the output end of the DC / DC converter 131 to the battery.

[0049] In the above embodiment, the charger 11 is a module for charging the battery. Chargers 11 corresponding to batteries with different charging requirements need to be used, so that the charger 11 can provide corresponding charging power and charging voltage for batteries with different charging requirements. The primary side switch module 111 is a functional module in the charger 11 responsible for transferring the input alternating current to the transformer 113. The transformer 113 can convert the alternating current from the primary side switch module 111 into alternating currents with different amplitudes to provide the required charging voltage for batteries with different charging requirements. The secondary side switch module 115 converts and provides the different amplitude alternating currents transmitted by the transformer 113 to batteries with different charging requirements for charging. At the same time, the transformer 113 can also play the role of electrical isolation.

[0050] Please refer to Figure 4 and Figure 10, in some embodiments, the primary side switching module 111 includes a primary side capacitor, a primary side inductor, and a first bridge arm array connected in parallel. The first bridge arm array includes a first switch bridge arm, a second switch bridge arm, a third switch bridge arm, and a fourth switch bridge arm connected in parallel. Two primary side switch tube units in the same direction are respectively connected in series on the first switch bridge arm, the second switch bridge arm, the third switch bridge arm, and the fourth switch bridge arm. The primary side switch tube unit includes a diode and a switch tube connected in parallel. The AC power supply is connected to the common node of the first switch bridge arm and the second switch bridge arm, and the primary side winding and the primary side inductor are connected in series and then connected to the common node of the third switch bridge arm and the fourth switch bridge arm together. The secondary side switching module 115 includes a second bridge arm array connected in parallel with the bus capacitor 117. The second bridge arm array includes a fifth switch bridge arm and a sixth switch bridge arm connected in parallel. The secondary side winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm. Two secondary side switch tube units in the same direction are respectively connected in series on the fifth switch bridge arm and the sixth switch bridge arm. The secondary side switch tube unit includes a diode and a switch tube connected in parallel, and the secondary side winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm.

[0051] Specifically, in the above embodiment, the charger 11 of this embodiment adopts a single-stage flyback structure. The single-stage flyback structure adopted by the charger 11 of this embodiment has no large-capacity electrolytic capacitor, so the output is an alternating current containing power frequency components. Because the charging system 10 uses the DC / DC converter module 13 to supplement and absorb the output current I OBC of the charger 11, so that the input current for charging the battery is direct current. The first bridge arm array in the primary side switching module 111 is used to transfer the input alternating current to the transformer 113, and the second bridge arm array in the secondary side switching module 115 is used to convert the alternating currents with different amplitudes transmitted by the transformer 113 and supply them to the batteries with different charging requirements for charging. In this way, the charger 11 of this embodiment adopting the first bridge arm array and the second bridge arm array can improve the charging efficiency and reliability of the charger 11, and improve the flexibility of the charging system 10 of the present application to adapt to batteries with different charging requirements.

[0052] Please refer to Figure 6, in some embodiments, the primary side switching module 111 includes a first primary inductor, a second primary inductor, and a primary capacitor and a first bridge arm array connected in parallel. The first bridge arm array includes a first switching bridge arm, a second switching bridge arm, and a third switching bridge arm connected in parallel. Two primary switching transistor units in the same direction are respectively connected in series on the first switching bridge arm, the second switching bridge arm, and the third switching bridge arm. The primary switching transistor unit includes a diode and a switching transistor connected in parallel. The first primary inductor is connected in series with an AC power supply and then connected to the common node of the first switching bridge arm and the second switching bridge arm. The second primary inductor is connected in series with the AC power supply and then connected to the common node of the first switching bridge arm and the third switching bridge arm. The primary winding is connected to the common node of the first switching bridge arm and the second switching bridge arm. The secondary side switching module 115 includes a secondary inductor and a second bridge arm array connected in parallel with the bus capacitor 117. The second bridge arm array is connected in parallel with the secondary capacitor and includes a fourth switching bridge arm and a fifth switching bridge arm connected in parallel. Two secondary switching transistor units in the same direction are respectively connected in series on the fourth switching bridge arm and the fifth switching bridge arm. The secondary switching transistor unit includes a diode and a switching transistor connected in parallel. The secondary inductor is connected in series with the secondary winding and then connected together to the common node of the fourth switching bridge arm and the fifth switching bridge arm.

[0053] In the above embodiment, the charger 11 adopts a single-stage flyback structure. The first bridge arm array in the primary side switching module 111 is used to transfer the input alternating current to the transformer 113. The second bridge arm array in the secondary side switching module 115 is used to convert the alternating current with different amplitudes output from the transformer 113 and supply it to the batteries with different charging requirements for charging. Thus, the charger 11 of this embodiment can improve the charging efficiency and reliability of the charger 11 and enhance the flexibility in adapting to different types of batteries by using the first bridge arm array and the second bridge arm array.

[0054] Moreover, in the charger 11 of this embodiment, the first bridge arm array only includes three switching bridge arms. Compared with the first bridge arm array of the charger 11 in the above embodiment (as shown in Figure 5 and Figure 10 ) which includes four switching bridge arms, the first bridge arm array of the charger 11 in this embodiment reduces the number of bridge arms, thereby reducing the cost of electronic devices in the charger 11. In addition, compared with the above embodiment, the charger 11 of this embodiment is provided with two primary inductors and one secondary inductor. The primary inductor and the secondary inductor can play a role in improving current harmonics.

[0055] Please refer to Figure 7, in some embodiments, the primary side switching module 111 includes a primary side inductor, and a primary side capacitor and a first bridge arm array connected in parallel. The first bridge arm array includes a first switching bridge arm, a second switching bridge arm, a third switching bridge arm, and a fourth switching bridge arm connected in parallel. Two primary side switching transistor units in the same direction are respectively connected in series on the third switching bridge arm and the fourth switching bridge arm. The primary side switching transistor unit includes a diode and a switching transistor connected in parallel. Two switching transistors are respectively connected in series on the first switching bridge arm and the second switching bridge arm. The AC power supply is connected to the common node of the first switching bridge arm and the second switching bridge arm. The primary side winding and the primary side inductor are connected in series and then connected together to the common node of the third switching bridge arm and the fourth switching bridge arm. The secondary side switching module 115 includes a second bridge arm array connected in parallel with the bus capacitor 117. The second bridge arm array includes a fifth switching bridge arm and a sixth switching bridge arm connected in parallel. Two secondary side switching transistor units in the same direction are respectively connected in series on the fifth switching bridge arm and the sixth switching bridge arm. The secondary side switching transistor unit includes a diode and a switching transistor connected in parallel. The secondary side winding is connected to the common node of the fifth switching bridge arm and the sixth switching bridge arm.

[0056] In the above embodiment, the charger 11 adopts a single-stage flyback structure. The first bridge arm array in the primary side switching module 111 is used to transfer the input alternating current to the transformer 113. The second bridge arm array in the secondary side switching module 115 is used to convert the alternating current with different amplitudes output from the transformer 113 and supply it to the batteries with different charging requirements for charging. Thus, the charger 11 of this embodiment can improve the charging efficiency and reliability of the charger 11 and enhance the flexibility in adapting to different types of batteries by using the first bridge arm array and the second bridge arm array.

[0057] Moreover, in the charger 11 of this embodiment, only switching transistors are provided in the primary side switching transistor units of the first switching bridge arm and the second switching bridge arm. Compared with the charger 11 of the above embodiment (such as Figure 5 and Figure 10 shown), in which both diodes and switching transistors are provided in the primary side switching transistor units of the first switching bridge arm and the second switching bridge arm, the number of diodes used in the first switching bridge arm and the second switching bridge arm of the charger 11 of this embodiment is reduced, thereby reducing the cost of electronic devices in the charger 11.

[0058] Please refer to Figure 8, in some embodiments, the primary side switching module 111 includes a first primary inductor, a second primary inductor, a capacitor unit connected in parallel, and a first bridge arm array. The capacitor unit includes two capacitors connected in series. The first bridge arm array includes a first switching bridge arm and a second switching bridge arm connected in parallel. Two primary side switching transistor units with the same direction are respectively connected in series on the first switching bridge arm and the second switching bridge arm. The primary side switching transistor unit includes a diode and a switching transistor connected in parallel. The AC power supply is connected in series with the first primary inductor and then connected together to the common node of the first switching bridge arm and the second switching bridge arm. The primary side winding is connected in series with the second primary inductor and then connected together to the common node of the first switching bridge arm and the capacitor unit. The secondary side switching module 115 includes a second bridge arm array connected in parallel with the bus capacitor 117. The second bridge arm array includes a third switching bridge arm and a fourth switching bridge arm connected in parallel. The secondary side winding is connected to the common node of the third switching bridge arm and the fourth switching bridge arm. Two secondary side switching transistor units with the same direction are respectively connected in series on the third switching bridge arm and the fourth switching bridge arm. The secondary side switching transistor unit includes a diode and a switching transistor connected in parallel.

[0059] In the above embodiments, the charger 11 adopts a single-stage flyback structure. The first bridge arm array in the primary side switching module 111 is used to transfer the input alternating current to the transformer 113. The second bridge arm array in the secondary side switching module 115 is used to convert the alternating current with different amplitudes output from the transformer 113 and supply it to the batteries with different charging requirements for charging. In this way, the charger 11 of this embodiment can improve the charging efficiency and reliability of the charger 11 by using the first bridge arm array and the second bridge arm array, and improve the flexibility of adapting to different types of batteries.

[0060] Moreover, in the charger 11 of this embodiment, the first bridge arm array only includes two switching bridge arms. Compared with the first bridge arm array of the charger 11 in the above embodiments (such as Figure 5 and Figure 10 shown) which includes four switching bridge arms, the first bridge arm array of the charger 11 in this embodiment reduces the number of bridge arms, thereby reducing the cost of electronic devices in the charger 11. At the same time, the capacitor unit connected in parallel with the first bridge arm array includes two capacitors connected in series. Compared with the primary side capacitor connected in parallel with the first bridge arm array of the charger 11 in the above embodiments (such as Figure 5 and Figure 10 shown) which is a single capacitor, the number of capacitors of the charger 11 in this embodiment increases. Using two capacitors with small capacitance to replace a single capacitor with large capacitance under the condition of realizing the same function can reduce the cost of electronic devices in the charger 11.

[0061] Please refer to Figure 9, in some embodiments, the primary side switch module 111 includes a primary side inductor and a first bridge arm array. The first bridge arm array includes a first switch bridge arm and a second switch bridge arm connected in parallel. Four switch tube units arranged in opposite directions in sequence are respectively connected in series on the first switch bridge arm and the second switch bridge arm. The switch tube unit includes a diode and a switch tube connected in parallel. The primary side inductor is connected in series with the primary side winding and then connected to the common node of the first switch bridge arm and the second switch bridge arm together. The secondary side switch module 115 includes a second bridge arm array connected in parallel with the bus capacitor 117. The second bridge arm array includes a third switch bridge arm and a fourth switch bridge arm connected in parallel. Two secondary side switch tube units in the same direction are respectively connected in series on the third switch bridge arm and the fourth switch bridge arm. The secondary side switch tube unit includes a diode and a switch tube connected in parallel. The secondary side winding is connected to the common node of the third switch bridge arm and the fourth switch bridge arm.

[0062] In the above embodiments, the charger 11 adopts a single-stage flyback structure. The first bridge arm array in the primary side switch module 111 is used to transfer the input alternating current to the transformer 113. The second bridge arm array in the secondary side switch module 115 is used to convert the alternating current with different amplitudes output from the transformer 113 and supply it to the batteries with different charging requirements for charging. Thus, the charger 11 in this embodiment can improve the charging efficiency and reliability of the charger 11 and enhance the flexibility of adapting to different types of batteries by using the first bridge arm array and the second bridge arm array.

[0063] Moreover, in the charger 11 of this embodiment, both the first switch bridge arm and the second switch bridge arm in the first bridge arm array are provided with four primary side switch tube units arranged in opposite directions in sequence. Compared with the charger 11 in the above embodiments (such as Figure 5 and Figure 10 shown), where the switch bridge arms of the first bridge arm array of the charger 11 are only provided with two primary side switch tube units, the charger 11 of this embodiment provides a primary side switch module 111 with a different structure, which can be used to cooperate with the newly developed combined components in the future.

[0064] Please refer to Figure 5, in some embodiments, the DC / DC converter 131 includes a first switching transistor unit Q13, a second switching transistor unit Q14, and a regulating inductor L2. Both the first switching transistor unit Q13 and the second switching transistor unit Q14 include a diode and a switching transistor connected in parallel. The first switching transistor unit Q13 and the second switching transistor unit Q14 are connected in series and then connected in parallel with the first capacitor 133. The first end of the regulating inductor L2 is connected to the intermediate node where the first switching transistor unit Q13 and the second switching transistor unit Q14 are connected. The second end of the regulating inductor L2 is connected to both the charger 11 and the battery. One end of the second capacitor 135 is connected to the second end of the regulating inductor L2, and the second end of the second capacitor 135 is also connected to the intermediate node where the first capacitor 133 and the second switching transistor unit Q14 are connected, and is connected to both the charger 11 and the battery. When the output current I of the charger 11 OBC is less than the average charging current I for the charger 11 to charge the battery AV , the controller 15 outputs a first control signal to control the duty cycle of the first switching transistor unit Q13 to regulate the output current of the DC / DC converter 131; when the output current I of the charger 11 OBC is greater than the average charging current I AV , the controller 15 outputs a second control signal to control the duty cycle of the second switching transistor unit Q14 to regulate the input current of the DC / DC converter 131.

[0065] Please refer to Figure 4 , in the above embodiments, the control signal generated by the PWM modulation controller for controlling the working mode of the DC / DC converter module 13 is used to control the duty cycles of the first switching transistor unit Q13 and the second switching transistor unit Q14 in the DC / DC converter 131. When the DC / DC converter 131 operates in the buck mode, the PWM modulation controller controls the duty cycle of the first switching transistor unit Q13 to regulate the output current of the DC / DC converter 131 to supplement the output current I of the charger 11 OBC ; when the DC / DC converter 131 operates in the boost mode, the PWM modulation controller controls the duty cycle of the second switching transistor unit Q14 to regulate the input current of the DC / DC converter 131 to absorb a part of the output current I of the charger 11 OBC .

[0066] Please refer to Figure 5 and Figure 10 , in some embodiments, the charging system 10 includes two parallel DC / DC converters 131, and the second ends of the regulating inductors L2 in the two DC / DC converters 131 are connected to each other. In the above embodiments, the two DC / DC converter modules 13 are connected in parallel. Compared with the charger 11 in the above embodiments (such as Figure 5As shown, there is only one DC / DC converter 131, and the same function as a high-power DC / DC converter 131 (relatively high cost) can be achieved through two parallel low-power DC / DC converters 131 (relatively low cost), thereby reducing the cost of electronic devices in the charger 11.

[0067] Please refer to Figure 5 , in some embodiments, the DC / DC converter 131 only serves the charging system 10. Please refer to Figure 10 , in other embodiments, the DC / DC converter 131 serves both the charging system 10 and the functional modules in the vehicle 1000 other than the charging system 10, and the working time of the DC / DC converter 131 serving the functional modules is staggered from the working time of serving the charging system 10.

[0068] In the above embodiments, the charging system 10 of the present application can set a DC / DC converter 131 dedicated to the charger 11, or the charging system 10 of the present application can reuse the existing DC / DC converter 131 serving the functional modules other than the charging system 10. In the case where the DC / DC converter 131 is reused, the cost of the charging system 10 of the present application can be further reduced. Specifically, this embodiment requires that the time when the DC / DC converter 131 works for the functional modules and the time when it works for the charger 11 do not overlap, so as to ensure that there is no response conflict problem in the DC / DC converter 131, and the orderly operation of the charger 11 and the functional modules can be guaranteed.

[0069] Please refer to Figure 10 , in certain embodiments, the functional module includes the motor controller 30 of the vehicle 1000, and the motor controller 30 includes a generating motor controller 31 and a driving motor controller 33. The generating motor controller 31 is configured to control the generating motor 40. The driving motor controller 33 is configured to control the driving motor 60. Since the motor controller 30 of the vehicle 1000 is only used during the driving process of the vehicle 1000 and does not overlap with the charging process of the charger 11 in time, it is assumed that the reused DC / DC converter 131 in this embodiment can be selected to serve the charging system 10 or the motor controller 30 to avoid response conflicts.

[0070] Please refer to Figure 11 , the present application provides an electronic device 100, and the electronic device 100 includes one or more processors 50 and a memory 70. The memory 70 stores a computer program 202. When the computer program 202 is executed by the processor 50, the steps of the control method in any of the above embodiments are implemented.

[0071] For example, please refer to Figure 1When the computer program 202 is executed by the processor 50, the following control method is implemented: 01: When the output current I of the charger 11 OBC is less than the average charging current I AV , control the DC / DC converter module 13 to be in the buck mode, and the current I at the output end of the DC / DC converter 131 DC is in the first direction; and 03: When the output current I of the charger 11 OBC is greater than the average charging current I AV , control the DC / DC converter module 13 to be in the boost mode, and the current I at the output end of the DC / DC converter 131 DC is in the second direction, and the first direction is opposite to the second direction.

[0072] The charger 11 is usually connected to an AC power supply. Therefore, the output current I of the charger 11 OBC contains a power frequency component, and the waveform is a pulsating mantou wave, as shown by the curve in Figure 3 . In the electronic device 100 of the present application, the output end of the charger 11 and the output end of the DC / DC converter module 13 are connected in parallel to the battery. The input end and the output end of the DC / DC converter 131 are respectively connected in parallel to the first capacitor 133 and the second capacitor 135, and the DC / DC converter 131 can be switched between two different operating modes, namely the buck mode and the boost mode, under the control of the controller 15. Specifically, when the output current I of the charger 11 OBC is less than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the buck mode, so as to discharge through the first capacitor 133 and the second capacitor 135 to supplement the output current I of the charger 11 OBC , so that the current for charging the battery is a direct current with a current magnitude equal to the average charging current I AV ; when the output current I of the charger 11 OBC is greater than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the boost mode, so as to store at least part of the output current I of the charger 11 through the first capacitor 133 and the second capacitor 135 OBC , so that the current for charging the battery is a direct current with a current magnitude equal to the average charging current I AV . Therefore, in the electronic device 100 of the present application, the charging current finally output by the charging system 10 to the battery is a smooth direct current (as shown by the straight line indicated by the dotted line in Figure 3 ), and the subsequent BMS can accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system 10.

[0073] Please refer to Figure 11 and Figure 12 , this application provides a vehicle 1000, and the vehicle 1000 includes the charging system 10 or the electronic device 100 of any one of the above embodiments.

[0074] The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc., and is not limited in this application.

[0075] The charger 11 is usually connected to an AC power supply. Therefore, the output current I of the charger 11 OBC contains power frequency components, and the waveform is a pulsating mantou wave, as shown by the curve in Figure 3 . In the vehicle 1000 of this application, the output end of the charger 11 and the output end of the DC / DC converter module 13 are connected in parallel to the battery. The input end and the output end of the DC / DC converter 131 are respectively connected in parallel with the first capacitor 133 and the second capacitor 135, and the DC / DC converter 131 can switch between two different operating modes, namely the buck mode and the boost mode, under the control of the controller 15. Specifically, when the output current I of the charger 11 OBC is less than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the buck mode, so as to discharge through the first capacitor 133 and the second capacitor 135 to supplement the output current I of the charger 11 OBC , so that the current charging the battery is a direct current with a current magnitude equal to the average charging current I AV ; when the output current I of the charger 11 OBC is greater than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the boost mode, so as to store at least part of the output current I of the charger 11 through the first capacitor 133 and the second capacitor 135 OBC , so that the current charging the battery is a direct current with a current magnitude equal to the average charging current I AV . Therefore, in the vehicle 1000 of this application, the charging current finally output by the charging system 10 to the battery is a smooth direct current (as shown by the straight line indicated by the dotted line in Figure 3 ), and the subsequent BMS can accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system 10.

[0076] Please refer to Figure 13 , this application provides a computer program product 200, including a computer program 202, which, when executed by a processor 50, implements the steps of the control method in any one of the above embodiments.

[0077] For example, please refer to Figure 1 , when the computer program 202 is executed by the processor 50, the following control method is implemented: 01: When the output current I of the charger 11 OBC is less than the average charging current I AV , control the DC / DC converter module 13 to be in the buck mode, and the current I at the output end of the DC / DC converter 131 DC is in the first direction; and 03: When the output current I of the charger 11 OBC is greater than the average charging current I AV , control the DC / DC converter module 13 to be in the boost mode, and the current I at the output end of the DC / DC converter 131 DC is in the second direction, and the first direction is opposite to the second direction.

[0078] The charger 11 is usually connected to an AC power supply. Therefore, the output current I of the charger 11 OBC contains a power frequency component, and the waveform is a pulsating bun-shaped wave, as shown by the curve in Figure 3 . In the charging system 10 to which the control method in the computer program product 200 of the present application is applied, the output end of the charger 11 and the output end of the DC / DC converter module 13 are connected in parallel to the battery. The input end and the output end of the DC / DC converter 131 are respectively connected in parallel to the first capacitor 133 and the second capacitor 135, and the DC / DC converter 131 can be switched between two different operating modes, namely the buck mode and the boost mode, under the control of the controller 15. Specifically, when the output current I of the charger 11 OBC is less than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the buck mode, so as to discharge through the first capacitor 133 and the second capacitor 135 to supplement the output current I of the charger 11 OBC , so that the current for charging the battery is a direct current with a current magnitude equal to the average charging current I AV ; when the output current I of the charger 11 OBC is greater than the average charging current I AV , the controller 15 controls the DC / DC converter module 13 to be in the boost mode, so as to store at least part of the output current I of the charger 11 through the first capacitor 133 and the second capacitor 135 OBC , so that the current for charging the battery is a direct current with a current magnitude equal to the average charging current I AVThe DC current. Therefore, in the charging system 10 to which the control method in the computer program product 20 of the present application is applied, the charging current finally output by the charging system 10 to the battery is a smooth DC current (as shown by the straight line indicated by the dashed line in Figure 3 ), and subsequently the BMS can accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system 10.

[0079] In the description of this specification, the descriptions referring to terms such as "certain embodiments", "in an example", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0080] Any process or method description shown in the flowchart or described in other ways herein can be understood to represent a module, segment or part of code including one or more executable instructions for implementing a specific logical function or process, and the scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the functions involved, rather than in the order shown or discussed, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0081] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A charging system, characterized in that: include: A charger (11), wherein an input end of the charger (11) is connected to an AC power source, and an output end of the charger (11) is configured to be connected to a battery; A DC / DC converter module (13), comprising a DC / DC converter (131), a first capacitor (133) and a second capacitor (135), wherein an input end of the DC / DC converter (131) is connected in parallel with the first capacitor (133), an output end of the DC / DC converter (131) is connected in parallel with the second capacitor (135), and an output end of the DC / DC converter (131) is connected in parallel with an output end of the charger (11) to the battery; and A controller (15) is connected to the DC / DC converter module (13) and is configured to control the DC / DC converter module (13) to switch between a boost mode and a buck mode, and to control the output current I of the charger (11) to be OBC is smaller than the average charging current I of the battery charged by the charger (11) AV In the case of the above, the controller (15) controls the DC / DC converter module (13) to be in the buck mode, and the current I at the output end of the DC / DC converter (131) DC is a first direction; the output current I of the charger (11) OBC Greater than the average charging current I AV In the case of the above, the controller (15) controls the DC / DC converter module (13) to be in the boost mode, and the current I at the output end of the DC / DC converter (131) DC is a second direction, and the first direction is opposite to the second direction.

2. The charging system according to claim 1, characterized in that: When the DC / DC converter module (13) is in the step-down mode, the voltage of the first capacitor (133) is greater than the voltage of the second capacitor (135), the first direction is the direction of outflow from the output end of the DC / DC converter (131), and the magnitude of the output current of the DC / DC converter (131) is the average charging current I AV The output current I of the charger (11) OBC The difference between When the DC / DC converter module (13) is in the boost mode, the voltage of the first capacitor (133) is greater than the voltage of the second capacitor (135), the second direction is the direction of flowing from the outside into the output end of the DC / DC converter (131), and the magnitude of the input current of the DC / DC converter (131) is the output current I of the charger (11). OBC With the average charging current I AV The difference between .

3. The charging system according to claim 1, characterized in that: The controller (15) comprises: A PID controller is connected to the output end of the DC / DC converter module (13) and is configured to: obtain a reference current I REF and the current I at the output end of the DC / DC converter (131) DC , obtain the reference current I REF The current I at the output end of the DC / DC converter (131) DC The difference δI between them is processed to generate a control voltage, and the reference current I REF The average charging current I AV The output current I of the charger (11) OBC the difference between A PWM modulation controller is connected to the PID controller and is configured to modulate the control voltage to generate a control signal for controlling the working mode of the DC / DC converter module (13), wherein the working mode includes the boost mode and the buck mode.

4. The charging system according to claim 1, characterized in that: The charger (11) comprises a single-stage topology structure or a multi-stage topology structure, and the output current I OBC For alternating current.

5. The charging system according to claim 1, characterized in that: The charger (11) comprises: a primary switch module (111), a transformer (113), a secondary switch module (115) and a bus capacitor (117); the primary switch module (111) is connected to both the AC power source and the transformer (113); the transformer (113) comprises a primary winding and a secondary winding; the primary winding is connected to the primary switch module (111); the secondary switch module (115) is connected between the secondary winding and the bus capacitor (117); and the output end of the secondary switch module (115) and the output end of the DC / DC converter (131) are connected in parallel to the battery.

6. The charging system according to claim 5, characterized in that: The primary switch module (111) comprises a primary capacitor, a primary inductor and a first bridge arm array connected in parallel, the first bridge arm array comprises a first switch bridge arm, a second switch bridge arm, a third switch bridge arm and a fourth switch bridge arm connected in parallel, the first switch bridge arm, the second switch bridge arm, the third switch bridge arm and the fourth switch bridge arm are respectively connected in series with two primary switch tube units in the same direction, the primary switch tube unit comprises a diode and a switch tube connected in parallel, the AC power supply is connected to a common node of the first switch bridge arm and the second switch bridge arm, the primary winding and the primary inductor are connected in series and are connected together to a common node of the third switch bridge arm and the fourth switch bridge arm; The secondary switch module (115) comprises a second bridge arm array connected in parallel with the bus capacitor (117), the second bridge arm array comprising a fifth switch bridge arm and a sixth switch bridge arm connected in parallel, the secondary winding connected to a common node of the fifth switch bridge arm and the sixth switch bridge arm, the fifth switch bridge arm and the sixth switch bridge arm are respectively connected in series with two secondary switch tube units in the same direction, the secondary switch tube units comprising a diode and a switch tube connected in parallel, and the secondary winding connected to a common node of the fifth switch bridge arm and the sixth switch bridge arm.

7. The charging system according to claim 5, characterized in that: The primary switch module (111) comprises a first primary inductor, a second primary inductor, a primary capacitor connected in parallel, and a first bridge arm array, the first bridge arm array comprises a first switch bridge arm, a second switch bridge arm, and a third switch bridge arm connected in parallel, the first switch bridge arm, the second switch bridge arm, and the third switch bridge arm are respectively connected in series with two primary switch tube units in the same direction, the primary switch tube units comprise a diode and a switch tube connected in parallel, the first primary inductor and the AC power supply are connected in series and then connected to a common node of the first switch bridge arm and the second switch bridge arm, the second primary inductor and the AC power supply are connected in series and then connected to a common node of the first switch bridge arm and the third switch bridge arm, and the primary winding is connected to a common node of the first switch bridge arm and the second switch bridge arm; The secondary switch module (115) comprises a secondary inductor and a second bridge arm array connected in parallel with the bus capacitor (117), the second bridge arm array being connected in parallel with the secondary capacitor and comprising a fourth switch bridge arm and a fifth switch bridge arm connected in parallel, the fourth switch bridge arm and the fifth switch bridge arm being respectively connected in series with two secondary switch tube units in the same direction, the secondary switch tube units comprising a diode and a switch tube connected in parallel, the secondary inductor being connected in series with the secondary winding and connected together to a common node of the fourth switch bridge arm and the fifth switch bridge arm.

8. The charging system according to claim 5, characterized in that: The primary switch module (111) comprises a primary inductor, a primary capacitor connected in parallel and a first bridge arm array, the first bridge arm array comprises a first switch bridge arm, a second switch bridge arm, a third switch bridge arm and a fourth switch bridge arm connected in parallel, the third switch bridge arm and the fourth switch bridge arm are respectively connected in series with two primary switch tube units in the same direction, the primary switch tube units comprise a diode and a switch tube connected in parallel, the first switch bridge arm and the second switch bridge arm are respectively connected in series with two of the switch tubes, the AC power supply is connected to a common node of the first switch bridge arm and the second switch bridge arm, the primary winding and the primary inductor are connected in series and are connected together to a common node of the third switch bridge arm and the fourth switch bridge arm; The secondary switch module (115) comprises a second bridge arm array connected in parallel with the bus capacitor (117), the second bridge arm array comprising a fifth switch bridge arm and a sixth switch bridge arm connected in parallel, the fifth switch bridge arm and the sixth switch bridge arm respectively having two secondary switch tube units in the same direction connected in series, the secondary switch tube units comprising a diode and a switch tube connected in parallel, and the secondary winding connected to a common node of the fifth switch bridge arm and the sixth switch bridge arm.

9. The charging system according to claim 5, characterized in that: The primary switch module (111) comprises a first primary inductor, a second primary inductor, a capacitor unit connected in parallel and a first bridge arm array, the capacitor unit comprises two capacitors connected in series, the first bridge arm array comprises a first switch bridge arm and a second switch bridge arm connected in parallel, the first switch bridge arm and the second switch bridge arm are respectively connected in series with two primary switch tube units in the same direction, the primary switch tube unit comprises a diode and a switch tube connected in parallel, the AC power supply and the first primary inductor are connected in series and connected together to a common node of the first switch bridge arm and the second switch bridge arm, and the primary winding and the second primary inductor are connected in series and connected together to a common node of the first switch bridge arm and the capacitor unit; The secondary switch module (115) comprises a second bridge arm array connected in parallel with the bus capacitor (117), the second bridge arm array comprising a third switch bridge arm and a fourth switch bridge arm connected in parallel, the secondary winding is connected to a common node of the third switch bridge arm and the fourth switch bridge arm, and two secondary switch tube units in the same direction are respectively connected in series on the third switch bridge arm and the fourth switch bridge arm, and the secondary switch tube units comprise a diode and a switch tube connected in parallel.

10. The charging system according to claim 5, characterized in that: The primary switch module (111) comprises a primary inductor and a first bridge arm array, the first bridge arm array comprises a first switch bridge arm and a second switch bridge arm connected in parallel, the first switch bridge arm and the second switch bridge arm are respectively connected in series with four switch tube units arranged in opposite directions, the switch tube units comprise parallel diodes and switch tubes, the primary inductor is connected in series with the primary winding and connected together to a common node of the first switch bridge arm and the second switch bridge arm; The secondary switch module (115) comprises a second bridge arm array connected in parallel with the bus capacitor (117), the second bridge arm array comprising a third switch bridge arm and a fourth switch bridge arm connected in parallel, the third switch bridge arm and the fourth switch bridge arm respectively having two secondary switch tube units in the same direction connected in series, the secondary switch tube units comprising a diode and a switch tube connected in parallel, and the secondary winding connected to a common node of the third switch bridge arm and the fourth switch bridge arm.

11. The charging system according to claim 1, characterized in that: The DC / DC converter (131) comprises a first switch tube unit (Q13), a second switch tube unit (Q14) and a regulating inductor (L2); the first switch tube unit (Q13) and the second switch tube unit (Q14) both comprise a diode and a switch tube connected in parallel; the first switch tube unit (Q13) and the second switch tube unit (Q14) are connected in series and then connected in parallel with the first capacitor (133); a first end of the regulating inductor (L2) is connected to an intermediate node where the first switch tube unit (Q13) and the second switch tube unit (Q14) are connected; a second end of the regulating inductor (L2) is connected to both the charger (11) and the battery; one end of the second capacitor (135) is connected to a second end of the regulating inductor (L2); a second end of the second capacitor (135) is also connected to an intermediate node where the first capacitor (133) and the second switch tube unit (Q14) are connected, and is connected to both the charger (11) and the battery; The output current I of the charger (11) OBC Less than the average charging current I AV In the case of the above, the controller (15) outputs a first control signal to control the duty cycle of the first switch tube unit (Q13) to adjust the output current of the DC / DC converter (131); The output current I of the charger (11) OBC Greater than the average charging current I AV In this case, the controller (15) outputs a second control signal to control the duty cycle of the second switch tube unit (Q14) to adjust the input current of the DC / DC converter (131).

12. The charging system according to claim 11, characterized in that: The charging system (10) comprises two parallel-connected DC / DC converters (131), and the second ends of the regulating inductors (L2) in the two DC / DC converters (131) are connected to each other.

13. The charging system according to claim 1, characterized in that: The DC / DC converter (131) only serves the charging system (10); or, The DC / DC converter (131) serves the charging system (10) and functional modules in the vehicle (1000) other than the charging system (10), and the working time of the DC / DC converter (131) serving the functional modules is staggered with the working time of serving the charging system (10).

14. The charging system according to claim 13, characterized in that: The functional module comprises a motor controller (30) of the vehicle (1000), and the motor controller (30) comprises a generator motor controller (31) and a drive motor controller (33).

15. A control method, applicable to the charging system according to any one of claims 1 to 14, characterized in that: The control method comprises: The output current I of the charger (11) OBC Less than the average charging current I AV In the case of the DC / DC converter module (13) being controlled to be in the step-down mode, the current I at the output end of the DC / DC converter (131) DC is the first direction; and The output current I of the charger (11) OBC Greater than the average charging current I AV In the case of the DC / DC converter module (13) being controlled to be in the boost mode, the current I at the output end of the DC / DC converter (131) DC is a second direction, and the first direction is opposite to the second direction.

16. The control method according to claim 15, characterized in that: When the DC / DC converter module (13) is in the step-down mode, the voltage of the first capacitor (133) is greater than the voltage of the second capacitor (135), the first direction is the direction of outflow from the output end of the DC / DC converter (131), and the magnitude of the output current of the DC / DC converter (131) is the average charging current I AV The output current I of the charger (11) OBC The difference between When the DC / DC converter module (13) is in the boost mode, the voltage of the first capacitor (133) is greater than the voltage of the second capacitor (135), the second direction is the direction of flowing from the outside into the output end of the DC / DC converter (131), and the magnitude of the input current of the DC / DC converter (131) is the output current I of the charger (11). OBC With the average charging current I AV The difference between .

17. An electronic device (100), characterized in that The method comprises one or more processors (50) and a memory (70), wherein the memory (70) stores a computer program (202), and when the computer program (202) is executed by the processor (50), the steps of the method described in any one of claims 15 or 16 are implemented.

18. A vehicle (1000), characterized in that: A charging system (10) comprising any one of claims 1 to 14; or an electronic device (100) comprising claim 17.

19. A computer program product (200), comprising a computer program (202), characterized in that When the computer program (202) is executed by a processor (50), the steps of the method according to any one of claims 15 or 16 are implemented.

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