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

Abstract

The present application relates to the field of charging technology, and specifically discloses a charging system, a control method, an electronic device, a vehicle, and a computer program product. The charging system includes a charger, a DC / DC converter module, and a controller. The input end of the charger is connected to an AC power source, and the output end is 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 is connected in parallel with the second capacitor, and the output end of the charger is connected in parallel with the battery. The DC / DC converter module also controls the DC / DC converter module to switch between boost mode and buck mode. At the output current I OBC Less than the average charging current I AV When the DC / DC converter module is in step-down mode, the current I DC The output current of the charger is I OBC Greater than the average charging current I AV When the controller controls the DC / DC converter module to be in boost mode, the current I DC A second direction opposite to the first direction.

Description

Technical Field

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

[0002] On-board chargers are crucial components for new energy vehicles. To meet market demand, some on-board chargers are eliminating large-capacity electrolytic capacitors, enabling them to move toward lower costs and higher power density.

[0003] However, since some on-board chargers do not have large-capacity electrolytic capacitors, the output current of the on-board charger is AC with industrial frequency components. As a result, the Battery Management System (BMS) cannot accurately calculate the State of Charge (SOC), which affects the BMS's ability to determine the battery charge status. 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 source, 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 is connected in parallel with the output end of the charger 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. At the output current I OBC Less than the average charging current I of the battery charged by the charger AV In the case of the above, the controller controls the DC / DC converter module to be in the step-down mode, and the current I DC In the first direction; the output current I OBC Greater than the average charging current I AV In the case of the above, the controller controls the DC / DC converter module to be in the boost mode, and the current I DC 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 flow 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 terminal 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 difference δI between the reference current and the reference current is processed to generate a control voltage. 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 an operating mode of the DC / DC converter module, wherein the operating 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 certain 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 source and the transformer. The transformer includes a primary winding and a secondary winding, the primary winding being connected to the primary switch module. The secondary switch module is connected between the secondary winding and the bus capacitor. The output of the secondary switch module and the output of the DC / DC converter are connected in parallel to the battery.

[0010] In certain embodiments, the primary switch module includes a primary capacitor, a primary inductor, and a first bridge arm array connected in parallel. The first bridge arm array includes a first switch arm, a second switch arm, a third switch arm, and a fourth switch arm connected in parallel. The first, second, third, and fourth switch arms are each connected in series with two primary switch tube units in the same direction. Each primary 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 and second switch arms. The primary winding and the primary inductor are connected in series and connected to the common node of the third and fourth switch arms. The secondary switch module includes a second bridge arm array connected in parallel with the bus capacitor. The second bridge arm array includes a fifth and sixth switch arms connected in parallel. The secondary winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm. Two secondary 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 switch tube unit includes a diode and a switch tube connected in parallel. The secondary winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm.

[0011] In certain embodiments, the primary switch module includes a first primary inductor, a second primary inductor, a parallel primary capacitor, and a first bridge arm array. The first bridge arm array includes a first switch arm, a second switch arm, and a third switch arm connected in parallel. Each of the first, second, and third switch arms has two primary switch transistor units connected in series in the same direction. Each primary switch transistor unit includes a diode and a switch transistor connected in parallel. The first primary inductor is connected in series with the AC power supply and then connected to the common node of the first and second switch arms. The second primary inductor is connected in series with the AC power supply and then connected to the common node of the first and third switch arms. The primary winding is connected to the common node of the first and second switch arms. The secondary switch module includes a secondary 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 capacitor and includes a fourth switch arm and a fifth switch arm connected in parallel. The fourth and fifth switching arms are each connected in series with two secondary switching tube units in the same direction, each comprising a diode and a switching tube connected in parallel. The secondary inductor is connected in series with the secondary winding and then connected together to a common node of the fourth and fifth switching arms.

[0012] In some embodiments, the primary switch module includes a primary inductor, a primary capacitor connected in parallel, and a first bridge arm array. The first bridge arm array includes a first switch arm, a second switch arm, a third switch arm, and a fourth switch arm connected in parallel. The third switch arm and the fourth switch arm are each connected in series with two primary switch transistor units in the same direction. Each primary switch transistor unit includes a diode and a switch transistor connected in parallel. The first switch arm and the second switch arm are each connected in series with two of the aforementioned switches. The AC power supply is connected to the common node of the first and second switch arms. The primary winding and the primary inductor are connected in series and connected to the common node of the third and fourth switch arms. The secondary switch module includes a second bridge arm array connected in parallel with the bus capacitor. The second bridge arm array includes a fifth switch arm and a sixth switch arm connected in parallel. Each of the fifth and sixth switch arms is connected in series with two secondary switch transistor units in the same direction. Each of the secondary switch transistor units includes a diode and a switch transistor connected in parallel. The secondary winding is connected to a common node of the fifth switching bridge arm and the sixth switching bridge arm.

[0013] In certain embodiments, the primary switch module 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 arm and a second switching arm connected in parallel. The first switching arm and the second switching arm each have two primary switching transistor units connected in series in the same direction. Each primary switching transistor unit includes a diode and a switching transistor connected in parallel. The AC power supply and the first primary inductor are connected in series and connected together to the common node of the first and second switching arms. The primary winding and the second primary inductor are connected in series and connected together to the common node of the first switching arm and the capacitor unit. The secondary switch module includes a second bridge arm array connected in parallel with the bus capacitor. The second bridge arm array includes a third switching arm and a fourth switching arm connected in parallel. The secondary winding is connected to the common node of the third and fourth switching arms. Two secondary switching transistor units connected in series in the same direction are each connected in series with the third and fourth switching arms. Each secondary switching transistor unit includes a diode and a switching transistor connected in parallel.

[0014] In certain embodiments, the primary switch module includes a primary 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. The first switch bridge arm and the second switch bridge arm each have four switch tube units connected in series, arranged in opposite directions. Each switch tube unit includes a diode and a switch tube connected in parallel. The primary inductor and the primary winding are connected in series and connected together to the common node of the first and second switch bridge arms. The secondary switch 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 third switch bridge arm and the fourth switch bridge arm each have two secondary switch tube units connected in series in the same direction. Each secondary switch tube unit includes a diode and a switch tube connected in parallel. The secondary winding is connected to the common node of the third and fourth switch bridge arms.

[0015] In certain embodiments, the DC / DC converter includes a first switching tube unit, a second switching tube unit, and a regulating inductor. The first switching tube unit and the second switching tube unit each 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 in parallel with the first capacitor. The first end of the regulating inductor is connected to the intermediate node where the first switching tube unit and the second switching tube unit are connected, and the second end of the regulating inductor is connected to both the charger and the battery. One end of the second capacitor is connected to the second end of the regulating inductor, and 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 Less than the average charging current I AV In the case of , the controller outputs a first control signal to control the duty cycle of the first switch tube unit to adjust the output current of the DC / DC converter; in the output current I OBC Greater than the average charging current I AV In this case, the controller outputs a second control signal to control the duty cycle of the second switch tube unit to adjust the input current of the DC / DC converter.

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

[0017] In certain 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 working time of the DC / DC converter serving the functional modules is staggered with the working time of the DC / DC converter serving the charging system.

[0019] In some embodiments, the functional module includes a motor controller of the vehicle, and the motor controller includes a generator motor controller and a drive motor controller.

[0020] In a second aspect, the present application provides a control method for a charging system according to any one of the above embodiments, the control method comprising: OBC Less than the average charging current I AV In the case of the DC / DC converter module being in the step-down mode, the current I DC The output current I of the charger is OBC Greater than the average charging current I AV In the case of the DC / DC converter module being controlled to be in the boost mode, the current I DC The first direction is opposite to the second direction.

[0021] 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 flow 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 terminal 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 .

[0022] In a third aspect, the present application provides an electronic device comprising one or more processors and a memory, wherein the memory stores a computer program, and when the computer program is executed by the processor, the steps in the method described in any of the above embodiments are implemented.

[0023] In a fourth aspect, the present application provides a vehicle, which includes any one of a charging system or an electronic device.

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

[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 source. Therefore, the output current I OBC Contains power frequency components, and the waveform is a pulsating steamed bun wave. In the charging system of the embodiment of the present application, the output end of the charger and the output end of the DC / DC converter module are connected in parallel to the battery, the input end and the output end of the DC / DC converter are connected in parallel with the first capacitor and the second capacitor respectively, and the DC / DC converter can switch between two different working modes, buck mode and boost mode, under the control of the controller. Specifically, when the output current I OBC Less than the average charging current I AV In the case of the voltage drop, the controller controls the DC / DC converter module to be in the buck mode, so as to discharge 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 equal to the average charging current I AV DC current; the output current of the charger I OBC Greater than the average charging current I AV In the case of the above, 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 equal to the average charging current I AV Therefore, the charging current ultimately outputted by the charging system of the present application to the battery is a smooth DC current, and the subsequent BMS can accurately calculate the charging capacity of the battery based on the charging current ultimately outputted by the charging system.

[0026] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0028] Figure 1 is a flow chart of a control method of some embodiments of the present application;

[0029] Figure 2 is a schematic structural diagram of a charging system according to some embodiments of the present application;

[0030] Figure 3 is a schematic structural diagram of the output current of a charger in a charging system according to some embodiments of the present application;

[0031] Figure 4 is a schematic structural diagram of a controller in a charging system according to some embodiments of the present application;

[0032] Figure 5 is a schematic structural diagram of a charging system according to some embodiments of the present application;

[0033] Figure 6 is a schematic structural diagram of a charger in a charging system according to some embodiments of the present application;

[0034] Figure 7 is a schematic structural diagram of a charger in a charging system according to some embodiments of the present application;

[0035] Figure 8 is a schematic structural diagram of a charger in a charging system according to some embodiments of the present application;

[0036] Figure 9 is a schematic structural diagram of a charger in a charging system according to some embodiments of the present application;

[0037] Figure 10 is a schematic structural diagram of a charging system according to some embodiments of the present application;

[0038] Figure 11 is a schematic structural diagram of an electronic device according to some embodiments of the present application;

[0039] Figure 12 is the structure of a vehicle in some embodiments of the present application;

[0040] Figure 13 This is a schematic diagram of the connection status of a computer program product and a processor in some embodiments of the present application.

[0041] The accompanying drawings in the specific implementation manner are as follows:

[0042] Charging system 10; charger 11; primary switch module 111; transformer 113; secondary 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; regulating inductor L2; first capacitor 133; second capacitor 135; controller 15; motor controller 30; generator motor controller 31; drive motor controller 33; starting motor 40; drive motor 60; electronic device 100; processor 50; memory 70; vehicle 1000; computer program product 200; computer program 202. DETAILED DESCRIPTION

[0043] In the description of this application, some of the disclosed contents are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The contents described below with reference to the accompanying drawings are illustrative and are only used to explain this application, and are not to be construed as limiting this application.

[0044] In the description of the present application, many different contents or examples are disclosed to implement different structures of the present application. In order 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.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0046] In the description of this application, it should be understood that the terms used to indicate orientation or positional relationships (such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc.) are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and facilitating the understanding of the corresponding embodiments, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms used to indicate orientation or positional relationships cannot be understood as limiting this application.

[0047] In the description of this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] On-board chargers, used to charge high-voltage power batteries, are crucial components for new energy vehicles. To meet market demand, on-board chargers are developing toward low cost and high power density. Existing on-board chargers often employ a two-stage topology, with large-capacity electrolytic capacitors placed between the front-stage AC / DC and the back-stage DC / DC, ensuring a smooth DC output current. In recent years, single-stage on-board chargers have emerged, eliminating the large-capacity electrolytic capacitors. Two-stage on-board chargers have also emerged, eliminating the electrolytic capacitors, resulting in lower costs and higher power density. However, due to the elimination of the large-capacity electrolytic capacitors, the AC current output by the on-board charger contains power frequency components, resulting in a squiggly current waveform.

[0049] Therefore, when the single-stage topology on-board charger or the two-stage topology on-board charger without the large-capacity electrolytic capacitor is used to charge the power battery, the output current is pulsating, which makes it impossible for the BMS to accurately calculate the SOC, thereby affecting the BMS's judgment of the battery state of charge. In order to solve this problem, the present application provides a charging system ( Figure 2 As shown), control method ( Figure 1 shown), electronic devices ( Figure 11 shown), vehicles ( Figure 12 shown) and computer program products ( Figure 13 shown).

[0050] See also Figure 1 and Figure 2 , the control method provided by this application includes:

[0051] 01: Output current I of charger 11 OBC Less than the average charging current I AV In the case of the DC / DC converter module 13 being in the step-down mode, the current I DC is the first direction;

[0052] 03: Output current I of charger 11 OBCGreater than the average charging current I AV In the case of controlling the DC / DC converter module 13 to be in the boost mode, the current I DC The first direction is opposite to the second direction.

[0053] 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 the AC power source, and the output end of the charger 11 is configured to be connected to the 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 is connected in parallel with the output end of the charger 11 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 the boost mode and the buck mode. At the output current I OBC Less than the average charging current I AV In the case of the voltage drop, the controller 15 controls the DC / DC converter module 13 to be in the buck mode, and the current I DC In the first direction; the output current I of the charger 11 OBC Greater than the average charging current I AV In the case of the controller 15, the DC / DC converter module 13 is in the boost mode, and the current I DC The first direction is opposite to the second direction.

[0054] Please refer to Figure 2 and Figure 3 In the method of 01, the input end of the charger 11 is connected to the AC power source so that high-frequency AC power enters the charger 11. The high-frequency AC power can be 220V or other high-frequency AC power with a voltage value. The output end of the charger 11 is configured to be connected to the battery. The charging system 10 transmits the output current I OBC Provided to the battery to enable the charger 11 to charge the battery. The average charging current I AV It refers to the ratio of the charging power of the charger 11 to the voltage of the battery being charged by the charger 11. The average charging current I AV It is determined by the properties of the charger 11 itself and the voltage of the battery being charged by the charger 11. OBC Less than the average charging current IAV In this case, the controller 15 will control the DC / DC converter 131 to enter the buck mode. This control process can be when the original mode (initial mode) of the DC / DC converter 131 is the buck mode and the controller 15 does not control the DC / DC converter 131 to switch the mode, or when 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 switch to the buck mode. The output end of the DC / DC converter 131 and the output end of the charger 11 are connected to the battery in parallel. At this time, in the buck mode, the current I DC The direction of the current at the output of the DC / DC converter 131 is consistent with the direction of the current at the output of the charger 11. DC The direction is the first direction.

[0055] 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 source so that high-frequency AC power enters the charger 11. The high-frequency AC power can be 220V or other high-frequency AC power with a voltage value. The output terminal of the charger 11 is configured to be connected to the battery. The charging system 10 transmits the output current I OBC Provided to the battery to realize charging of the battery. OBC 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 DC / DC converter 131 to switch the mode, 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 switch to the boost mode. The output end of the DC / DC converter 131 and the output end of the charger 11 are connected to the battery in parallel. At this time, in the boost mode, relative to the battery, the current I DC The direction of the current at the output of the DC / DC converter 131 is inconsistent with the direction of the current at the output of the charger 11. DC The direction is the second direction, and the first direction and the second direction are opposite to each other with respect to the DC / DC converter 131 .

[0056] The charger 11 is usually connected to an AC power source, so the output current I OBC Contains power frequency components, and the waveform is a pulsating steamed bun wave, such as Figure 3As shown in the curve in . In the charging system 10 using the control method 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 connected in parallel with the first capacitor 133 and the second capacitor 135 respectively, and the DC / DC converter 131 can switch between two different working modes, namely, the buck mode and the boost mode, under the control of the controller 15. Specifically, when the output current I OBC Less than the average charging current I AV In the case of the voltage drop, the controller 15 controls the DC / DC converter module 13 to be in the buck mode, so as to discharge 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 equal to the average charging current I AV DC current; 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, 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 equal to the average charging current I AV Therefore, the charging current that the charging system 10 of the present application finally outputs to the battery is a smooth DC current (such as Figure 3 As shown by the dotted line in FIG), the BMS can subsequently accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system 10.

[0057] Please continue reading Figure 2 In some embodiments, 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 output current of the DC / DC converter 131 is the average charging current I AV 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 of flowing from the outside into the output end of the DC / DC converter 131, and the input current of the DC / DC converter 131 is equal to the output current I of the charger 11. OBC and the average charging current I AV The difference between .

[0058] 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 end of the DC / DC converter 131. DC The power flows out from the output end of the DC / DC converter 131 and flows toward the common node of the DC / DC converter 131, the charger 11 and the battery ( Figure 2 Middle I DC The output current of the DC / DC converter 131 supplements the current at the output of the charger 11. Moreover, the output current of the DC / DC converter 131 is equal to the average charging current I AV The output current I of the charger 11 OBC At this time, the input current of the battery is the current I at the output end of the DC / DC converter 131. DC The DC current formed by the superposition of the current at the output end of the charger 11 is equal to the average charging current I AV The current size.

[0059] 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 refers to the current I at the output end of the DC / DC converter 131. DC The direction of the current flowing from the common node of the charger 11 and the battery to the output terminal of the DC / DC converter 131 ( Figure 2 Middle I DC In the direction of the lower left), the output current of the DC / DC converter 131 plays a role in absorbing the current at the output end of the charger 11. Moreover, the output current of the DC / DC converter 131 is equal to the average charging current I AV The output current I of the charger 11 OBC At this time, the input current of the battery is the current I at the output end of the DC / DC converter 131. DC The DC current formed by the superposition of the current at the output end of the charger 11 is equal to the average charging current I AV The current size.

[0060] Please refer to Figure 2 and Figure 4 In some embodiments, the controller 15 includes a PID controller and a PWM modulation controller. The 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 of the DC / DC converter 131 DC , obtain the reference current I REFThe current I DC The difference δI between them is processed to generate the 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, wherein the working mode includes a boost mode and a buck mode.

[0061] 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 of the DC / DC converter 131 DC , and the reference current I REF The current I DC The difference δI between them is used to adjust the current I at the output of the DC / DC converter 131 through a combination of three steps: proportional (P), integral (I) and derivative (D). DC The PWM modulation controller generates a control signal for controlling the operating mode of the DC / DC converter module 13 based on the control voltage provided by the PID controller, switching the DC / DC converter module 13 between the boost mode and the buck mode.

[0062] 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 multi-level topology (not shown), the output current I OBC For alternating current.

[0063] A charger with a single-stage topology structure without a large-capacity electrolytic capacitor or a charger with a multi-stage topology structure without a large-capacity electrolytic capacitor has advantages such as simple structure, low cost and high power density, and can better meet market demand. However, due to the lack of a large-capacity electrolytic capacitor, the output current I OBC The AC power makes it impossible for the BMS to accurately obtain the SOC, which affects the BMS's judgment of the battery's state of charge. DC Output current I to charger 11 OBC The charging system 10 can supplement or absorb the DC current without the need for a large-capacity electrolytic capacitor, so that the charging current ultimately output to the battery by the charging system 10 is a smooth DC current. This can output the same DC current to the battery as a multi-stage topology charger that directly outputs DC current, thereby having the above advantages while avoiding the above problems.

[0064] Please refer to Figure 5 In some embodiments, the charger 11 includes 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 the AC power source and the transformer 113. The transformer 113 includes 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. The output of the secondary switch module 115 is connected in parallel with the output of the DC / DC converter 131 to the battery.

[0065] In the above embodiment, the charger 11 is a module for charging the battery. Batteries with different charging requirements need to use the corresponding charger 11, so that the charger 11 can provide corresponding charging power and charging voltage for batteries with different charging requirements. The primary switch module 111 is a functional module in the charger 11 responsible for transferring the input AC power to the transformer 113. The transformer 113 can convert the AC power from the primary switch module 111 into AC power of different amplitudes to provide the required charging voltage for batteries with different charging requirements. The secondary switch module 115 converts the AC power of different amplitudes transmitted by the transformer 113 and provides it to batteries with different charging requirements for charging. At the same time, the transformer 113 can also play a role in electrical isolation.

[0066] Please refer to Figure 4 and Figure 10In some embodiments, the primary switch module 111 includes a primary capacitor, a primary 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 switch tube units in the same direction are 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 respectively. The primary 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 winding and the primary inductor are connected in series and connected together to the common node of the third switch bridge arm and the fourth switch bridge arm. The secondary switch 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 winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm. Two secondary switch tube units in the same direction are connected in series on the fifth switch bridge arm and the sixth switch bridge arm respectively. The secondary switch tube unit includes a diode and a switch tube connected in parallel. The secondary winding is connected to the common node of the fifth switch bridge arm and the sixth switch bridge arm.

[0067] Specifically, in the above embodiment, the charger 11 of this embodiment adopts a single-stage structure. The single-stage structure adopted by the charger 11 of this embodiment does not have a large-capacity electrolytic capacitor, so the output is an AC current containing an industrial frequency component. Because the charging system 10 uses the DC / DC converter module 13 to convert the output current I OBC The first bridge arm array in the primary switch module 111 is used to transfer the input AC power to the transformer 113, and the second bridge arm array in the secondary switch module 115 is used to convert the AC power of different amplitudes transmitted by the transformer 113 and provide it to batteries with different charging requirements for charging. Thus, the charger 11 of this embodiment uses the first bridge arm array and the second bridge arm array to improve the charging efficiency and reliability of the charger 11 and increase the flexibility of the charging system 10 of this application to adapt to batteries with different charging requirements.

[0068] Please refer to Figure 6In some embodiments, the primary switch module 111 includes a first primary inductor, a second primary inductor, a parallel primary capacitor, and a first bridge arm array. The first bridge arm array includes a first switch arm, a second switch arm, and a third switch arm connected in parallel. Two primary switch tube units in the same direction are connected in series to each of the first, second, and third switch arms. The primary switch tube units include a diode and a switch tube 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 and second switch arms. The second primary inductor is connected in series with an AC power supply and then connected to the common node of the first and third switch arms. The primary winding is connected to the common node of the first and second switch arms. The secondary switch module 115 includes a secondary inductor and a second bridge arm array connected in parallel with a bus capacitor 117. The second bridge arm array is connected in parallel with the secondary capacitor and includes a fourth switch arm and a fifth switch arm connected in parallel. Two secondary switching transistor units with the same direction are connected in series to the fourth and fifth switching arms, respectively. Each secondary switching transistor unit includes a diode and a switching transistor connected in parallel. A secondary inductor is connected in series with the secondary winding and then connected to the common node of the fourth and fifth switching arms.

[0069] In the above embodiment, charger 11 adopts a single-stage structure. The first bridge arm array in primary-side switch module 111 is used to transfer the input AC power to transformer 113. The second bridge arm array in secondary-side switch module 115 is used to convert the AC power of different amplitudes transmitted by transformer 113 and provide it to batteries with different charging requirements for charging. Thus, the use of the first and second bridge arm arrays in charger 11 of this embodiment improves the charging efficiency and reliability of charger 11 and increases its flexibility in adapting to different types of batteries.

[0070] Moreover, in the charger 11 of this embodiment, the first bridge arm array only includes three switch bridge arms, which is different from the charger 11 of the above embodiment (such as Figure 5 and Figure 10 The first bridge arm array (shown in FIG. 1 ) 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 components in the charger 11. Furthermore, compared to the previous embodiment, the charger 11 in this embodiment includes two primary inductors and one secondary inductor. These primary and secondary inductors can help improve current harmonics.

[0071] Please refer to Figure 7In some embodiments, the primary switch module 111 includes a primary inductor, a primary capacitor connected in parallel, and a first bridge arm array. The first bridge arm array includes a first switch arm, a second switch arm, a third switch arm, and a fourth switch arm connected in parallel. The third and fourth switch arms each have two primary switch transistor units connected in series in the same direction. Each primary switch transistor unit includes a diode and a switch transistor connected in parallel. The first and second switch arms each have two switch transistors connected in series. An AC power source is connected to the common node of the first and second switch arms. The primary winding and the primary inductor are connected in series and connected to the common node of the third and fourth switch arms. The secondary switch module 115 includes a second bridge arm array connected in parallel with the bus capacitor 117. The second bridge arm array includes a fifth and a sixth switch arm connected in parallel. The fifth and sixth switch arms each have two secondary switch transistor units connected in series in the same direction. Each secondary switch transistor unit includes a diode and a switch transistor connected in parallel. The secondary winding is connected to a common node of the fifth switching bridge arm and the sixth switching bridge arm.

[0072] In the above embodiment, charger 11 adopts a single-stage structure. The first bridge arm array in primary-side switch module 111 is used to transfer the input AC power to transformer 113. The second bridge arm array in secondary-side switch module 115 is used to convert the AC power of different amplitudes transmitted by transformer 113 and provide it to batteries with different charging requirements for charging. Thus, the use of the first and second bridge arm arrays in charger 11 of this embodiment improves the charging efficiency and reliability of charger 11 and increases its flexibility in adapting to different types of batteries.

[0073] Moreover, in the charger 11 of this embodiment, only switch tubes are provided in the primary switch tube units of the first switch bridge arm and the second switch bridge arm. Compared with the charger 11 of the above embodiment (such as Figure 5 and Figure 10 The primary side switch tube units of the first switch bridge arm and the second switch bridge arm (as shown) are provided with diodes and switch tubes at the same time. The first switch bridge arm and the second switch bridge arm of the charger 11 in this embodiment reduce the number of diodes used, thereby reducing the cost of electronic devices in the charger 11.

[0074] Please refer to Figure 8In some embodiments, the primary switch 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 arm and a second switching arm connected in parallel. Two primary switching transistor units connected in series with the same direction are each connected in series with the first switching arm and the second switching arm. The primary switching transistor units include a diode and a switching transistor connected in parallel. The AC power supply and the first primary inductor are connected in series and connected together to the common node of the first switching arm and the second switching arm. The primary winding and the second primary inductor are connected in series and connected together to the common node of the first switching arm and the capacitor unit. The secondary 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 switching arm and a fourth switching arm connected in parallel. The secondary winding is connected to the common node of the third and fourth switching arms. Two secondary switching transistor units connected in series with the same direction are each connected in series with the third switching arm and the fourth switching arm. The secondary switching transistor units include a diode and a switching transistor connected in parallel.

[0075] In the above embodiment, charger 11 adopts a single-stage structure. The first bridge arm array in primary-side switch module 111 is used to transfer the input AC power to transformer 113. The second bridge arm array in secondary-side switch module 115 is used to convert the AC power of different amplitudes transmitted by transformer 113 and provide it to batteries with different charging requirements for charging. Thus, the use of the first and second bridge arm arrays in charger 11 of this embodiment improves the charging efficiency and reliability of charger 11 and increases its flexibility in adapting to different types of batteries.

[0076] Moreover, in the charger 11 of this embodiment, the first bridge arm array only includes two switch bridge arms, which is different from the charger 11 of the above embodiment (such as Figure 5 and Figure 10 The first bridge arm array of the charger 11 of this embodiment (as shown) includes four switch bridge arms. The first bridge arm array of the charger 11 of this embodiment reduces the number of bridge arms, thereby reducing the cost of electronic components 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 charger 11 of the above embodiment (as shown), Figure 5 and Figure 10 The primary capacitor connected in parallel with the first bridge arm array is a capacitor. The number of capacitors in the charger 11 of this embodiment is increased. When the same function is achieved, two capacitors with small capacitance are used to replace a single capacitor with large capacitance, which can reduce the cost of electronic devices in the charger 11.

[0077] Please refer to Figure 9In some embodiments, the primary switch module 111 includes a primary 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. 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 include parallel diodes and switch tubes. The primary inductor and the primary winding are connected in series and connected together to the common node of the first switch bridge arm and the second switch bridge arm. The secondary switch module 115 includes a second bridge arm array connected in parallel with the bus capacitor 117, and the second bridge arm array includes a third switch bridge arm and a fourth switch bridge arm connected in parallel. Two secondary switch tube units in the same direction are respectively connected in series with the third switch bridge arm and the fourth switch bridge arm. The secondary switch tube units include parallel diodes and switch tubes, and the secondary winding is connected to the common node of the third switch bridge arm and the fourth switch bridge arm.

[0078] In the above embodiment, the charger 11 adopts a single-stage structure. The first bridge arm array in the primary switch module 111 is used to transfer the input AC power to the transformer 113. The second bridge arm array in the secondary switch module 115 is used to convert the AC power of different amplitudes transmitted by the transformer 113 and provide it to batteries with different charging requirements for charging. Thus, the charger 11 of this embodiment uses the first and second bridge arm arrays to improve the charging efficiency and reliability of the charger 11 and increase its flexibility in adapting to different types of batteries.

[0079] Moreover, in the charger 11 of this embodiment, the first switch bridge arm and the second switch bridge arm in the first bridge arm array are each provided with four primary switch tube units arranged in opposite directions. Figure 5 and Figure 10 The switch bridge arm of the first bridge arm array (as shown) is provided with only two primary switch tube units. The charger 11 of this embodiment provides a primary switch module 111 of different structures, which can be used to cooperate with subsequently developed combination components.

[0080] Please refer to Figure 5In 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. The first switching transistor unit Q13 and the second switching transistor unit Q14 each 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 in parallel with the first capacitor 133. The first end of the regulating inductor L2 is connected to the intermediate node between the first switching transistor unit Q13 and the second switching transistor unit Q14. 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. The second end of the second capacitor 135 is also connected to the intermediate node between the first capacitor 133 and the second switching transistor unit Q14, and is connected to both the charger 11 and the battery. When the output current I OBC Less than the average charging current I of the battery charged by the charger 11 AV In the case of , 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; when the output current I 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.

[0081] Please combine Figure 4 In the above embodiment, the PWM modulation controller generates a control signal for controlling the operating mode of the DC / DC converter module 13. The control signal is used to control the duty cycle of the first switching tube unit Q13 and the second switching tube 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 tube unit Q13 to adjust 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 switch unit Q14 to adjust the input current of the DC / DC converter 131 to absorb the output current I of the charger 11. OBC Part of it.

[0082] 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 embodiment, the two DC / DC converter modules 13 are connected in parallel. Compared with the charger 11 (such as Figure 5The charger 11 (shown) is only equipped with a DC / DC converter 131. It is possible to achieve the same function as a high-power DC / DC converter 131 (relatively high cost) by using two low-power DC / DC converters 131 (relatively low cost) connected in parallel, thereby reducing the cost of electronic components in the charger 11.

[0083] Please refer to Figure 5 In some embodiments, the DC / DC converter 131 only serves the charging system 10. Figure 10 In other embodiments, the DC / DC converter 131 serves the charging system 10 and functional modules other than the charging system 10 in the vehicle 1000 at the same time, 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.

[0084] In the above embodiment, the charging system 10 of the present application can be provided with a DC / DC converter 131 specifically serving the charger 11, or the charging system 10 of the present application can reuse an existing DC / DC converter 131 serving 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 module and the time when it works for the charger 11 cannot overlap, so as to ensure that the DC / DC converter 131 does not have response conflicts and can ensure the orderly operation of the charger 11 and the functional modules.

[0085] Please refer to Figure 10 In some embodiments, the functional module includes a motor controller 30 for vehicle 1000 , which includes a generator motor controller 31 and a drive motor controller 33 . Generator motor controller 31 is configured to control generator motor 40 . Drive motor controller 33 is configured to control drive motor 60 . Since motor controller 30 of vehicle 1000 is only used while vehicle 1000 is driving and does not overlap with the charging process of charger 11 , the reused DC / DC converter 131 in this embodiment can selectively serve either the charging system 10 or the motor controller 30 to avoid response conflicts.

[0086] See also Figure 11 The present application provides an electronic device 100, which 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 of any one of the above embodiments are implemented.

[0087] For example, see Figure 1When the computer program 202 is executed by the processor 50, the following control method is implemented:

[0088] 01: Output current I of charger 11 OBC Less than the average charging current I AV In the case of the DC / DC converter module 13 being in the step-down mode, the current I DC is the first direction; and

[0089] 03: Output current I of charger 11 OBC Greater than the average charging current I AV In the case of controlling the DC / DC converter module 13 to be in the boost mode, the current I DC The first direction is opposite to the second direction.

[0090] The charger 11 is usually connected to an AC power source, so the output current I OBC Contains power frequency components, and the waveform is a pulsating steamed bun wave, such as Figure 3 As shown in the curve in . 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 connected in parallel with the first capacitor 133 and the second capacitor 135 respectively, and the DC / DC converter 131 can switch between two different working modes, namely, the buck mode and the boost mode, under the control of the controller 15. Specifically, when the output current I OBC Less than the average charging current I AV In the case of the voltage drop, the controller 15 controls the DC / DC converter module 13 to be in the buck mode, so as to discharge 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 equal to the average charging current I AV DC current; 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, 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 equal to the average charging current I AV Therefore, in the electronic device 100 of the present application, the charging current ultimately outputted by the charging system 10 to the battery is a smooth DC current (e.g. Figure 3As shown by the dotted line in FIG), the BMS can subsequently accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system 10.

[0091] See also Figure 11 and Figure 12 The present application provides a vehicle 1000 , which includes the charging system 10 or the electronic device 100 according to any one of the above-mentioned embodiments.

[0092] Vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc., which is not limited in this application.

[0093] The charger 11 is usually connected to an AC power source, so the output current I OBC Contains power frequency components, and the waveform is a pulsating steamed bun wave, such as Figure 3 As shown in the curve in . In the vehicle 1000 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 connected in parallel with the first capacitor 133 and the second capacitor 135 respectively, and the DC / DC converter 131 can switch between two different working modes, namely, the buck mode and the boost mode, under the control of the controller 15. Specifically, when the output current I OBC Less than the average charging current I AV In the case of the voltage drop, the controller 15 controls the DC / DC converter module 13 to be in the buck mode, so as to discharge 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 equal to the average charging current I AV DC current; 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, 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 equal to the average charging current I AV Therefore, in the vehicle 1000 of the present application, the charging current ultimately outputted by the charging system 10 to the battery is a smooth DC current (e.g. Figure 3 As shown by the dotted line in FIG), the BMS can subsequently accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system 10.

[0094] See also Figure 13The present application provides a computer program product 200, including a computer program 202, which implements the steps of the control method in any of the above embodiments when the computer program 202 is executed by the processor 50.

[0095] For example, see Figure 1 When the computer program 202 is executed by the processor 50, the following control method is implemented:

[0096] 01: Output current I of charger 11 OBC Less than the average charging current I AV In the case of the DC / DC converter module 13 being in the step-down mode, the current I DC is the first direction; and

[0097] 03: Output current I of charger 11 OBC Greater than the average charging current I AV In the case of controlling the DC / DC converter module 13 to be in the boost mode, the current I DC The first direction is opposite to the second direction.

[0098] The charger 11 is usually connected to an AC power source, so the output current I OBC Contains power frequency components, and the waveform is a pulsating steamed bun wave, such as Figure 3 As shown in the curve in . 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 connected in parallel with the first capacitor 133 and the second capacitor 135 respectively, and the DC / DC converter 131 can switch between two different working modes, namely, the buck mode and the boost mode, under the control of the controller 15. Specifically, when the output current I OBC Less than the average charging current I AV In the case of the voltage drop, the controller 15 controls the DC / DC converter module 13 to be in the buck mode, so as to discharge 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 equal to the average charging current I AV DC current; 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, 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 equal to the average charging current I AV Therefore, in the charging system 10 to which the control method in the computer program product 200 of the present application is applied, the charging current ultimately outputted by the charging system 10 to the battery is a smooth DC current (e.g. Figure 3 As shown by the dotted line in FIG), the BMS can subsequently accurately calculate the charging power for charging the battery based on the charging current finally output by the charging system 10.

[0099] In the description of this specification, the reference terms "certain embodiments", "in an example", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction 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 embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0100] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0101] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify 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) includes a DC / DC converter (131), a first capacitor (133), and a second capacitor (135), wherein 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; 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 OBC Less 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, wherein the first direction is opposite to the second direction; 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 output current of the DC / DC converter (131) is equal to 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 flow 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 .

2. The charging system according to claim 1, wherein: 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.

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

4. The charging system according to claim 1, wherein: 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); 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.

5. The charging system according to claim 4, 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 the 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 then connected together to the common node of the third switch bridge arm and the fourth switch bridge arm; The secondary switch 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 winding is 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 include a diode and a switch tube connected in parallel, and the secondary winding is connected to a common node of the fifth switch bridge arm and the sixth switch bridge arm.

6. The charging system according to claim 4, 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, wherein 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, wherein 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, wherein the primary switch tube units comprise a diode and a switch tube connected in parallel, wherein 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, wherein 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 wherein the primary winding is connected to a common node of the first switch bridge arm and the second switch bridge arm; The secondary side switch module (115) includes a secondary side 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 side capacitor, and includes 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 are respectively connected in series with two secondary side switch tube units in the same direction, the secondary side switch tube units include parallel diodes and switch tubes, and the secondary side inductor is connected in series with the secondary side winding and connected together to the common node of the fourth switch bridge arm and the fifth switch bridge arm.

7. The charging system according to claim 4, 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 the 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 then connected together to the common node of the third switch bridge arm and the fourth switch bridge arm; 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 fifth switch bridge arm and a sixth switch bridge arm connected in parallel, the fifth switch bridge arm and the sixth switch bridge arm are respectively connected in series with two secondary side switch tube units in the same direction, the secondary side switch tube units include a diode and a switch tube connected in parallel, and the secondary side winding is connected to a common node of the fifth switch bridge arm and the sixth switch bridge arm.

8. The charging system according to claim 4, wherein: 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, wherein 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 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, the secondary side winding is connected to a common node of the third switch bridge arm and the fourth switch bridge arm, and 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, and the secondary side switch tube units include a diode and a switch tube connected in parallel.

9. The charging system according to claim 4, 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 and the primary winding are connected in series and then connected together to a common node of the first switch bridge arm and the second switch bridge arm; 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, the third switch bridge arm and the fourth switch bridge arm are respectively connected in series with two secondary side switch tube units in the same direction, the secondary side switch tube units include a diode and a switch tube connected in parallel, and the secondary side winding is connected to a common node of the third switch bridge arm and the fourth switch bridge arm.

10. The charging system according to claim 1, wherein: The DC / DC converter (131) includes a first switch tube unit (Q13), a second switch tube unit (Q14) and a regulating inductor (L2), wherein the first switch tube unit (Q13) and the second switch tube unit (Q14) each include 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), the first end of the regulating inductor (L2) is connected to the middle node where the first switch tube unit (Q13) and the second switch tube 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), the second end of the second capacitor (135) is also connected to the middle 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).

11. The charging system according to claim 10, characterized in that: The charging system (10) includes 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.

12. The charging system according to claim 1, wherein: The DC / DC converter (131) only serves the charging system (10); or, The DC / DC converter (131) serves 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 with the working time of the DC / DC converter (131) serving the charging system (10).

13. The charging system according to claim 12, wherein: The functional module includes a motor controller (30) of the vehicle (1000), and the motor controller (30) includes a power generation motor controller (31) and a drive motor controller (33).

14. A control method, applicable to the charging system according to any one of claims 1 to 13, characterized in that: The control method includes: 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 The first direction is opposite to the second direction.

15. The control method according to claim 14, 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 output current of the DC / DC converter (131) is equal to 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 flow 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 .

16. 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 according to any one of claims 14 or 15 are implemented.

17. A vehicle (1000), characterized in that A charging system (10) comprising any one of claims 1 to 13; or an electronic device (100) comprising claim 16.

18. A computer program product (200), comprising a computer program (202), characterized in that When the computer program (202) is executed by the processor (50), the steps of the method according to any one of claims 14 or 15 are implemented.

Images