Vehicle-mounted charger and vehicle

Abstract

The invention discloses a vehicle-mounted charger and a vehicle. The vehicle-mounted charger comprises a bus capacitor; the first end of the function module is connected with the bus capacitor; the first end of the switch module is connected with the second end of the function module, and the second end of the switch module is used for being connected with a storage battery; wherein the function switching of the functional module is realized by controlling the on-off of the switch module, and when the switch module is switched on, the functional module can be connected with the storage battery through the switch module for charging; when the switch module is switched off, the functional module can perform harmonic compensation on the bus voltage. The vehicle-mounted charger provided by the invention has more abundant functions.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more particularly to an on-board charger and a vehicle. Background Art

[0002] An on-board charger (OBC) is a power system that converts AC power into DC power. It is used as an on-board charging device for electric vehicles to charge battery packs. Existing on-board charger systems mostly use a two-stage topology, with a PFC circuit (power factor correction circuit) at the front stage and an isolated DC / DC circuit at the back stage. There is a bus capacitor between the PFC circuit and the DC / DC circuit.

[0003] Generally, on-board chargers are compatible with single-phase AC charging and three-phase AC charging. During single-phase AC charging, there is a large secondary ripple at the bus capacitor, causing the output voltage of the on-board charger to also have secondary ripples.

[0004] Therefore, improvements are needed to at least partially solve the above problems. Summary of the invention

[0005] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0006] In order to at least partially solve the above problem, according to a first aspect of the present invention, there is provided a vehicle-mounted charger, comprising: a bus capacitor;

[0007] A functional module, wherein a first end of the functional module is connected to the bus capacitor;

[0008] A switch module, wherein a first end of the switch module is connected to a second end of the functional module, and a second end of the switch module is used to be connected to a battery;

[0009] Wherein, when the switch module is turned on, the functional module can be connected to the battery through the switch module for charging;

[0010] When the switch module is disconnected, the functional module can perform harmonic compensation on the bus voltage, where the bus voltage is the voltage across the bus capacitor.

[0011] By way of example, the functional module includes a switch circuit and an LC circuit, and the LC circuit is connected between the switch circuit and the switch module.

[0012] For example, when the switch module is disconnected and the bus voltage is higher than a preset voltage, the switch circuit is controlled to be on and off so that the bus voltage flows to the capacitor in the LC circuit;

[0013] When the switch module is disconnected and the bus voltage is lower than the preset voltage, the switch circuit is controlled to be on and off so that the voltage of the capacitor flows to the bus capacitor.

[0014] Illustratively, the LC circuit includes an inductor and a capacitor;

[0015] The first end of the inductor is connected to the switch circuit, the second end of the inductor is connected to the switch module, the first end of the capacitor is connected to the second end of the inductor, and the second end of the capacitor is connected to one end of the switch circuit.

[0016] Exemplarily, the switch circuit includes a first bridge arm;

[0017] The first end of the inductor is connected to the midpoint of the first bridge arm, the second end of the inductor is connected to the switch module, the first end of the capacitor is connected to the second end of the inductor, and the second end of the capacitor is connected to one end of the first bridge arm.

[0018] By way of example, the switch circuit includes a half-bridge inverter circuit, a first transformer and two switch tubes;

[0019] The first transformer includes a first primary winding and a first secondary winding, the half-bridge inverter circuit is connected to the first primary winding, the first end of the inductor is connected to the midpoint of the first secondary winding, the second end of the inductor is connected to the switch module, the first end of the capacitor is connected to the second end of the inductor, the second end of the capacitor is simultaneously connected to the first ends of the two switching tubes, and the second ends of the two switching tubes are respectively connected to the two ends of the first secondary winding.

[0020] By way of example, the switch circuit includes a first full-bridge inverter circuit, a second transformer and two switch tubes;

[0021] The second transformer includes a second primary winding and a second secondary winding, the first full-bridge inverter circuit is connected to the second primary winding, the first end of the inductor is connected to the midpoint of the second secondary winding, the second end of the inductor is connected to the switch module, the first end of the capacitor is connected to the second end of the inductor, the second end of the capacitor is simultaneously connected to the first ends of the two switching tubes, and the second ends of the two switching tubes are respectively connected to the two ends of the second secondary winding.

[0022] For example, the on-board charger further includes a PFC module and a DC / DC module;

[0023] The PFC module is connected to the bus capacitor;

[0024] The first end of the DC / DC module is connected to the bus capacitor, the second end of the DC / DC module is connected to the power battery, and the third end of the DC / DC module is connected to the storage battery.

[0025] For example, the DC / DC module includes:

[0026] A second full-bridge inverter circuit, wherein a first end of the second full-bridge inverter circuit is connected to the bus capacitor;

[0027] a third transformer, the third transformer comprising a third primary winding, a third secondary winding and a fourth secondary winding, the third primary winding being connected to the second end of the second full-bridge inverter circuit;

[0028] a first full-bridge rectifier circuit, wherein a first end of the first full-bridge rectifier circuit is connected to the third secondary winding, and a second end of the first full-bridge rectifier circuit is connected to the power battery;

[0029] a second full-bridge rectifier circuit, wherein a first end of the second full-bridge rectifier circuit is connected to the fourth secondary winding;

[0030] A BUCK buck circuit, wherein a first end of the BUCK buck circuit is connected to a second end of the second full-bridge rectifier circuit, and a second end of the BUCK buck circuit is connected to the battery.

[0031] For example, the DC / DC module includes:

[0032] A third full-bridge inverter circuit, a first end of the third full-bridge inverter circuit being connected to the bus capacitor;

[0033] a fourth transformer, the fourth transformer comprising a fourth primary winding and a fifth secondary winding, the fourth primary winding being connected to the second end of the third full-bridge inverter circuit;

[0034] a third full-bridge rectifier circuit, wherein a first end of the third full-bridge rectifier circuit is connected to the fifth secondary winding, and a second end of the third full-bridge rectifier circuit is connected to the battery;

[0035] a fourth full-bridge inverter circuit, wherein a first end of the fourth full-bridge inverter circuit is connected to a second end of the third full-bridge rectifier circuit;

[0036] a fifth transformer, the fifth transformer comprising a fifth primary winding and a sixth secondary winding, the fifth primary winding being connected to the second end of the fourth full-bridge inverter circuit;

[0037] A third full-wave rectifier circuit, wherein a first end of the third full-wave rectifier circuit is connected to the sixth secondary winding, and a first end of the third full-wave rectifier circuit is connected to the battery.

[0038] For example, the PFC module includes:

[0039] A second bridge arm, two ends of the second bridge arm are respectively connected to two ends of the bus capacitor;

[0040] A third bridge arm, two ends of the third bridge arm are respectively connected to two ends of the bus capacitor;

[0041] A fourth bridge arm, two ends of the fourth bridge arm are respectively connected to two ends of the bus capacitor;

[0042] A fifth bridge arm, two ends of the fifth bridge arm are respectively connected to two ends of the bus capacitor;

[0043] a second inductor, wherein a first end of the second inductor is connected to a midpoint of the second bridge arm, and a second end of the second inductor is connected to a first live wire end of the AC charging port;

[0044] a third inductor, wherein a first end of the third inductor is connected to a midpoint of the third bridge arm,

[0045] a switch, wherein a first end of the switch is connected to a second end of the third inductor, and a second end of the switch can be selectively connected to a first live wire end or a second live wire end of the AC charging port;

[0046] a fourth inductor, wherein a first end of the fourth inductor is connected to a midpoint of the fourth bridge arm, and a second end of the fourth inductor is connected to a third live wire terminal of the AC charging port;

[0047] A fifth inductor, wherein a first end of the fifth inductor is connected to a midpoint of the fifth bridge arm, and a second end of the fifth inductor is connected to a neutral line terminal of the AC charging port.

[0048] According to a second aspect of the present invention, a vehicle is provided, comprising the on-board charger as described above.

[0049] According to the on-board charger and vehicle of the present invention, the function switching of the functional module can be realized by controlling the on and off of the switch module. When the switch module is turned on, the functional module can be connected to the battery through the switch module to reduce the voltage so as to charge the battery; when the switch module is disconnected, the functional module can perform harmonic compensation on the bus voltage and eliminate secondary ripple, so that the on-board charger has richer functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The following drawings of the present application are hereby used as part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, and are used to explain the device and principle of the present application. In the drawings,

[0051] Figure 1 This is a schematic diagram of the circuit structure of the on-board charger of the first embodiment of the present application.

[0052] Figure 2 This is a schematic diagram of the circuit structure of the on-board charger of the second embodiment of the present application.

[0053] Figure 3 This is a schematic diagram of the circuit structure of a vehicle charger according to the third embodiment of the present application.

[0054] Figure 4 This is a schematic diagram of the circuit structure of the on-board charger of the fourth embodiment of the present application.

[0055] Description of reference numerals:

[0056] 100-PFC module, 200-bus capacitor, 300-DC / DC module, 300'-DC / DC module, 400-functional module, 410-switching circuit, 400'-functional module, 410'-switching circuit, 400"-functional module, 410"-switching circuit, 500-switching module, 600-power battery, 700-battery. DETAILED DESCRIPTION

[0057] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0058] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0059] It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0060] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein for convenience of description to describe the relationship of one element or feature to other elements or features shown in the figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation shown in the figures.

[0061] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present application. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0062] Embodiments of the invention are described herein with reference to cross-sectional views as schematic diagrams of ideal embodiments (and intermediate structures) of the present application. Thus, variations in the shapes shown due to, for example, manufacturing techniques and / or tolerances can be expected. Therefore, embodiments of the present application should not be limited to the specific shapes shown herein, but include shape deviations due to, for example, manufacturing. Therefore, what is shown in the figures is schematic in nature, and their shapes are not intended to display the actual shape of the device and are not intended to limit the scope of the present application.

[0063] See attached Figure 1 The on-board charger according to the first embodiment of the present application is exemplarily described. The on-board charger is applied to a vehicle and is used to charge a power battery 600 and a storage battery 700 of the vehicle. The on-board charger includes a bus capacitor 200 , a functional module 400 and a switch module 500 .

[0064] The first end of the functional module 400 is connected to the bus capacitor 200, the first end of the switch module 500 is connected to the second end of the functional module 400, and the second end of the switch module 500 is used to connect to the battery 700. Among them, the function switching of the functional module 400 can be realized by controlling the on and off of the switch module 500. The functional module 400 is used to meet the multi-functional requirements of the on-board charger. On the one hand, when the switch module 500 is turned on, the functional module 400 can be connected to the battery 700 through the switch module 500 for charging. For example, when the low-voltage output port of the on-board charger fails, the switch module 500 can be controlled to be turned on so that the functional module 400 is connected to the battery 700 through the switch module. At this time, the functional module 400 can step down the bus voltage (the bus voltage is the voltage across the bus capacitor 200) to charge the battery 700. On the other hand, when the switch module 500 is disconnected, the functional module 400 performs harmonic compensation on the bus voltage. For example, when the on-board charger is charging with single-phase AC, there will be large secondary ripples at the bus capacitor 200, resulting in secondary ripples at the low-voltage output end, which will reduce the adaptability of the vehicle load. At this time, the functional module 400 can be used as a harmonic compensator to perform harmonic compensation on the bus voltage to offset the secondary ripples at the bus capacitor 200 in the single-phase AC charging state.

[0065] In the embodiment of the present application, the functional module 400 includes a switch circuit 410 and an LC circuit. The LC circuit includes an inductor L1 and a capacitor C1. The LC circuit is connected between the switch circuit 410 and the switch module 500. Thus, when the switch module 500 is turned on, the inductor L1 can be charged and discharged to achieve voltage reduction by controlling the on and off of the switch circuit 410. For example, the on and off of the switch circuit 410 can be controlled first so that the bus voltage charges the inductor L1 and the battery 700 at the same time, and then the on and off of the switch circuit 410 can be controlled so that the inductor L1 charges the battery 700. Repeating the above process can reduce the bus voltage and charge the battery 700. When the switch module 500 is turned on, the capacitor C1 can be charged and discharged by controlling the on and off of the switch circuit 410 to compensate for the harmonics of the bus voltage. Specifically, a first end of the inductor L1 is connected to the switch circuit 410, a second end of the inductor L1 is connected to the switch module 500, a first end of the capacitor C1 is connected to a second end of the inductor L1, and a second end of the capacitor C1 is connected to one end of the switch circuit 410. In this embodiment, the second end of the capacitor C1 is also connected to the switch module 500.

[0066] In the embodiment of the present application, when the switch module 500 is disconnected and the bus voltage is higher than the preset voltage, the switch circuit 410 is controlled to be on and off so that the bus voltage flows to the capacitor C1. During this process, the bus voltage decreases and the capacitor C1 is charged until the bus voltage is equal to the preset voltage. When the switch module 500 is disconnected and the bus voltage is lower than the preset voltage, the switch circuit 410 is controlled to be on and off so that the voltage of the capacitor C1 flows to the bus capacitor 200. During this process, the capacitor C1 is discharged and the bus voltage increases until the bus voltage is equal to the preset voltage. The bus voltage is the voltage across the bus capacitor 200. For example, the preset voltage is 390V. When the bus voltage is higher than 390V, the switch circuit 410 is controlled to be on and off so that the bus voltage flows to the capacitor C1 to charge the capacitor C1; when the bus voltage is lower than 390V, the switch circuit 410 is controlled to be on and off so that the capacitor C1 is discharged and the voltage of the capacitor C1 flows to the bus capacitor 200, that is, flows to the bus to increase the bus voltage. By controlling in this way, peak shaving and valley filling can be effectively performed to compensate for harmonics of the bus voltage. In other embodiments, the preset voltage can also be set to other values, and those skilled in the art can set it according to actual conditions.

[0067] In the embodiment of the present application, the switch circuit 410 includes a first bridge arm, the first bridge arm includes a switch tube Q22 and a switch tube Q23 connected in series, and the two ends of the first bridge arm are respectively connected to the two ends of the bus capacitor 200. The first end of the inductor L1 is connected to the midpoint of the first bridge arm, the second end of the inductor L1 is connected to the switch module 500, the first end of the capacitor C1 is connected to the second end of the inductor L1, and the second end of the capacitor C1 is connected to one end of the first bridge arm. The second end of the capacitor C1 is also connected to the switch module 500.

[0068] In the embodiment of the present application, the switch module 500 includes a first switch K1 and a second switch K2. Specifically, the first end of the first switch K1 is connected to the first end of the first capacitor C1, the second end of the first switch K1 is connected to the first end of the battery 700, the first end of the second switch K2 is connected to the second end of the first capacitor C1, and the second end of the second switch K2 is connected to the second end of the battery 700. In some other embodiments, the switch module 500 may include only one switch, the first end of the switch is connected to one end of the first capacitor C1, the other end of the switch is connected to the positive or negative electrode of the battery 700, and accordingly, the other end of the first capacitor C1 is connected to the negative or positive electrode of the battery 700. Those skilled in the art may set the switch module 500 according to actual conditions, as long as the function of turning on or off the connection between the functional module 400 and the battery 700 can be realized through the switch module 500.

[0069] See below Figure 1The working principle of the functional module 400 of the present embodiment is described in detail. When the switch module 500 is disconnected, the functional module 400 can perform harmonic compensation on the bus voltage. Specifically, the functional module 400 can respectively realize the step-up and step-down working modes. When the switch module 500 is disconnected and the bus voltage is higher than the preset voltage, when the functional module 400 is in the step-down mode, the switch tube Q23 is always in the off state, and the duty cycle of the switch tube Q22 is set to realize the step-down function. First, the switch tube Q22 is turned on, the bus voltage is the energy storage of the first inductor L1, and the current flows from the bus to the first capacitor C1, and then the switch tube Q22 is turned off, the first inductor L1 maintains the original current direction, and the body diode of the switch tube Q23 is used for continuous flow, and the first capacitor C1 continues to be charged, thereby realizing the step-down working mode from the bus, wherein the size control of the capacitor voltage of the first capacitor C1 is realized by setting the duty cycle of the switch tube Q22. When the switch module 500 is disconnected and the bus voltage is lower than the preset voltage, the functional module 400 is in the boost mode, the switch tube Q22 is always in the off state, and the duty cycle of the switch tube Q23 is set to realize the boost function. The switch tube Q23 is turned on first, and the first capacitor C1 stores energy for the first inductor L1, and then the switch tube Q23 is turned off. The inductor maintains the original current direction, and the body diode of the switch tube Q22 is used to continue to replenish the bus, thereby realizing the working mode of reducing the voltage to the bus, wherein the duty cycle of the switch tube Q23 is set to realize the control of the amount of energy replenished by the bus capacitor 200. Therefore, the functional module 400 can perform harmonic compensation on the bus voltage to offset the secondary ripple at the bus capacitor 200 in the single-phase AC charging state.

[0070] When the switch module 500 is turned on, the function module 400 can be connected to the battery 700 through the switch module 500 to reduce the voltage. Specifically, the first switch K1 and the second switch K2 are closed to connect the function module 400 to the battery 700 through the function module 400. At this time, the function module 400 can be used as a BUCK step-down circuit to reduce the bus voltage and charge the battery 700.

[0071] In the embodiment of the present application, the on-board charger also includes a PFC module 100, and the PFC module 100 is connected to the bus capacitor 200. The first end of the PFC module 100 is connected to the AC charging port, and the AC charging port is connected to the power grid during charging. The PFC module 100 is used to achieve power factor correction and improve power utilization. The second end of the PFC module 100 is connected to the bus capacitor 200, and the bus capacitor 200 is used to filter the direct current output by the PFC module 100 to reduce voltage fluctuations. Specifically, the PFC module 100 includes a second bridge arm (the second bridge arm includes a switch tube Q1 and a switch tube Q2 connected in series), a third bridge arm (the third bridge arm includes a switch tube Q3 and a switch tube Q4 connected in series), a fourth bridge arm (the fourth bridge arm includes a switch tube Q5 and a switch tube Q6 connected in series), a fifth bridge arm (the fifth bridge arm includes a switch tube Q7 and a switch tube Q8 connected in series), a second inductor L2, a third inductor L3, a switch K3, a fourth inductor L4, and a fifth inductor L5. The two ends of the second bridge arm are respectively connected to the two ends of the bus capacitor 200, the first end of the second inductor L2 is connected to the midpoint of the second bridge arm, and the second end of the second inductor L2 is connected to the first live wire terminal l1 of the AC charging port. The two ends of the third bridge arm are respectively connected to the two ends of the bus capacitor 200, and the first end of the third inductor L3 is connected to the midpoint of the third bridge arm. The two ends of the fourth bridge arm are respectively connected to the two ends of the bus capacitor 200, the first end of the fourth inductor L4 is connected to the midpoint of the fourth bridge arm, and the second end of the fourth inductor L4 is connected to the third live wire terminal l3 of the AC charging port. The two ends of the fifth bridge arm are respectively connected to the two ends of the bus capacitor 200, the first end of the fifth inductor L5 is connected to the midpoint of the fifth bridge arm, and the second end of the fifth inductor L5 is connected to the neutral line terminal N of the AC charging port. The first end of the switch K3 is connected to the second end of the third inductor L3, and the second end of the switch K3 can be selectively connected to the first live wire terminal l1 or the second live wire terminal l2 of the AC charging port. The switch K3 is used to switch the on-board charger between a single-phase AC charging state and a three-phase AC charging state. When the second end of the switch K3 is connected to the second live wire terminal l2 of the AC charging port, the on-board charger is in a three-phase AC charging state. When the second end of the switch K3 is connected to the first live wire terminal l1 of the AC charging port, the on-board charger is in a single-phase AC charging state.

[0072] In the embodiment of the present application, the PFC module 100 further includes a first pre-charging resistor, a first pre-charging relay, a second pre-charging resistor, a second pre-charging relay, a third pre-charging resistor and a third pre-charging relay. The second end of the second inductor L2 is connected to the first live wire terminal l1 through the first pre-charging resistor, and the two ends of the first pre-charging relay are respectively connected to the two ends of the first pre-charging resistor; the second end of the third inductor L3 is connected to the first end of the switch K3 through the second pre-charging resistor, and the two ends of the second pre-charging relay are respectively connected to the two ends of the second pre-charging resistor; the second end of the fourth inductor L4 is connected to the third live wire terminal l3 through the third pre-charging resistor, and the two ends of the third pre-charging relay are respectively connected to the two ends of the third pre-charging resistor.

[0073] In the embodiment of the present application, the PFC module 100 further includes a first EMI filter, which is used to reduce electromagnetic radiation and suppress electromagnetic induction. A first end of the first EMI filter is connected to the AC charging port, and a second end of the first EMI filter is connected to the first pre-charging resistor, the second end of the switch K, the third pre-charging resistor, and the second end of the fifth inductor L5.

[0074] In the embodiment of the present application, the on-board charger also includes a DC / DC module 300. The DC / DC module 300 is used to convert the input voltage into an effective fixed output voltage to realize power supply to the load. The first end of the DC / DC module 300 is connected to the two ends of the bus capacitor 200, the second end of the DC / DC module 300 is connected to the power battery 600, and the third end of the DC / DC module 300 is connected to the battery 700. The DC / DC module 300 is integrated as a whole and can charge the high-voltage power battery 600 and the low-voltage battery 700 at the same time in the form of three ports.

[0075] In an embodiment of the present application, the DC / DC module 300 includes a second full-bridge inverter circuit, a third transformer T3, a first full-bridge rectifier circuit, a second full-bridge rectifier circuit and a BUCK step-down circuit. The first end of the second full-bridge inverter circuit is connected to the bus capacitor 200. Specifically, the second full-bridge inverter circuit includes a sixth bridge arm (the sixth bridge arm includes a switch tube Q9 and a switch tube Q10 connected in series) and a seventh bridge arm (the seventh bridge arm includes a switch tube Q11 and a switch tube Q12 connected in series), and the two ends of the sixth bridge arm are connected to the two ends of the bus capacitor 200, and the two ends of the seventh bridge arm are connected to the two ends of the bus capacitor 200. The third transformer T3 includes a third primary winding, a third secondary winding and a fourth secondary winding, and the third primary winding is connected to the second end of the second full-bridge inverter circuit. Specifically, the first end of the third primary winding is connected to the midpoint of the sixth bridge arm, and the second end of the third primary winding is connected to the midpoint of the seventh bridge arm. The first end of the first full-bridge rectifier circuit is connected to the third secondary winding, and the second end of the first full-bridge rectifier circuit is connected to the power battery 600. Specifically, the first full-bridge rectifier circuit includes an eighth bridge arm (the eighth bridge arm includes a switch tube Q13 and a switch tube Q14 connected in series) and a ninth bridge arm (the ninth bridge arm includes a switch tube Q15 and a switch tube Q16 connected in series), the midpoint of the eighth bridge arm is connected to the first end of the third secondary winding, and the midpoint of the ninth bridge arm is connected to the second end of the third secondary winding. Both ends of the eighth bridge arm and the ninth bridge arm are connected to the positive and negative electrodes of the power battery 600. The first end of the second full-bridge rectifier circuit is connected to the fourth secondary winding. Specifically, the second full-bridge rectifier circuit includes a tenth bridge arm (the tenth bridge arm includes a switch tube Q17 and a switch tube Q18 connected in series) and an eleventh bridge arm (the eleventh bridge arm includes a switch tube Q19 and a switch tube Q20 connected in series), the midpoint of the tenth bridge arm is connected to the first end of the fourth secondary winding, and the midpoint of the eleventh bridge arm is connected to the second end of the fourth secondary winding. The first end of the BUCK buck circuit is connected to the second end of the second full-bridge rectifier circuit, and the second end of the BUCK buck circuit is connected to the battery 700. Specifically, the BUCK buck circuit includes a twelfth bridge arm (the twelfth bridge arm includes a switch tube Q21 and a diode D1 connected in series), an inductor L6 and a capacitor C2, the two ends of the twelfth bridge arm are respectively connected to the two ends of the tenth bridge arm and the eleventh bridge arm, the first end of the inductor L6 is connected to the midpoint of the twelfth bridge arm, the first end of the capacitor C2 is connected to the second end of the inductor L6, and the second end of the capacitor C2 is connected to one end of the twelfth bridge arm, that is, connected to the positive terminal of the diode D1. Both ends of capacitor C2 are also connected to the positive and negative electrodes of battery 700 .

[0076] In an embodiment of the present application, the second full-bridge inverter circuit also includes an inductor L7 and a capacitor C3, wherein the inductor L7 is connected between the midpoint of the sixth bridge arm and the first end of the third primary winding, and the capacitor C3 is connected between the midpoint of the seventh bridge arm and the second end of the third primary winding. The first full-bridge rectifier circuit also includes an inductor L8 and a capacitor C4, wherein the inductor L8 is connected between the midpoint of the eighth bridge arm and the first end of the third secondary winding, and the fourth capacitor C4 is connected between the midpoint of the ninth bridge arm and the second end of the third secondary winding. A capacitor C5 and a second EMI filter are also provided between the first full-bridge rectifier circuit and the power battery 600. A capacitor C6 is also provided between the second full-bridge rectifier circuit and the BUCK step-down circuit.

[0077] According to the on-board charger of this embodiment, when any one of the second full-bridge inverter circuit, the third transformer T3, the second full-bridge rectifier circuit and the BUCK step-down circuit fails, that is, when the battery 700 cannot be charged through the DC / DC module 300, the module 500 can be turned on and the bus voltage can be stepped down through the functional module 400 to charge the battery 700, thereby improving the reliability of the vehicle.

[0078] See attached Figure 2 The on-board charger according to the second embodiment of the present application is exemplarily described. The on-board charger is applied to a vehicle and is used to charge a power battery 600 and a storage battery 700 of the vehicle. The on-board charger includes a PFC module 100, a bus capacitor 200, a DC / DC module 300, a functional module 400' and a switch module 500. The PFC module 100, the bus capacitor 200, the DC / DC module 300 and the switch module 500 are the same as those in the above embodiment and will not be repeated here.

[0079] The first end of the functional module 400' is connected to the bus capacitor 200, the first end of the switch module 500 is connected to the second end of the functional module 400', and the second end of the switch module 500 is used to connect to the battery 700. The function switching of the functional module 400' is realized by controlling the on and off of the switch module 500. On the one hand, when the switch module 500 is turned on, the functional module 400' can be connected to the battery 700 through the switch module 500 to reduce the voltage. On the other hand, when the switch module 500 is disconnected, the functional module 400' can perform harmonic compensation on the bus voltage.

[0080] Functional module 400' includes switch circuit 410' and LC circuit. LC circuit includes inductor L9 and capacitor C7. LC circuit is connected between switch circuit 410' and switch module 500. Thus, when switch module 500 is turned on, inductor L9 can be charged and discharged to achieve voltage reduction by controlling the on and off of switch circuit 410'. For example, the on and off of switch circuit 410' can be controlled first so that bus voltage charges inductor L9 and battery 700 at the same time, and then the on and off of switch circuit 410' can be controlled so that inductor L9 charges battery 700. Repeating the above process can reduce bus voltage and charge battery 700. When switch module 500 is turned on, capacitor C7 can be charged and discharged by controlling the on and off of switch circuit 410' to compensate for bus voltage harmonics. Specifically, the first end of the inductor L9 is connected to the switch circuit 410', the second end of the inductor L9 is connected to the switch module 500, the first end of the capacitor C7 is connected to the second end of the inductor L9, and the second end of the capacitor C7 is connected to one end of the switch circuit 410'. In this embodiment, the second end of the capacitor C7 is also connected to the switch module 500.

[0081] In the embodiment of the present application, when the switch module 500 is disconnected and the bus voltage is higher than the preset voltage, the switch circuit 410' is controlled to be turned on and off so that the bus voltage flows to the capacitor C7. During this process, the bus voltage decreases and the capacitor C7 is charged until the bus voltage is equal to the preset voltage. When the switch module 500 is disconnected and the bus voltage is lower than the preset voltage, the switch circuit 410' is controlled to be turned on and off so that the voltage of the capacitor C7 flows to the bus capacitor 200. During this process, the capacitor C7 is discharged and the bus voltage increases until the bus voltage is equal to the preset voltage. The bus voltage is the voltage across the bus capacitor 200. For example, the preset voltage is 390V. When the bus voltage is higher than 390V, the switch circuit 410' is controlled to be on and off so that the bus voltage flows to the capacitor C7; when the bus voltage is lower than 390V, the switch circuit 410' is controlled to be on and off so that the voltage of the capacitor C7 flows to the bus capacitor 200. By controlling in this way, the peak can be effectively cut and the valley can be filled, and the bus voltage can be harmonically compensated. In other embodiments, the preset voltage can also be set to other values, and those skilled in the art can set it according to actual conditions.

[0082] See attached Figure 2In this embodiment, the switch circuit 410' includes a half-bridge inverter circuit, a first transformer T1 and two switch tubes (i.e., switch tube Q26 and switch tube Q27). The first transformer T1 includes a first primary winding and a first secondary winding, the half-bridge inverter circuit is connected to the first primary winding, the first end of the inductor L9 is connected to the midpoint of the first secondary winding, the second end of the inductor L9 is connected to the switch module 500, the first end of the capacitor C7 is connected to the second end of the inductor L9, the second end of the capacitor C7 is connected to the first end of the switch tube Q26 and the first end of the switch tube Q27 at the same time, and the second end of the switch tube Q26 and the second end of the switch tube Q27 are respectively connected to the two ends of the first secondary winding.

[0083] Specifically, the half-bridge inverter circuit includes a capacitor C14, a capacitor C15 and a thirteenth bridge arm (the fourteenth bridge arm includes a switch tube Q24 and a switch tube Q25 connected in series in sequence), the first end of the capacitor C14 is connected to the first end of the bus capacitor, the second end of the capacitor C14 is connected to the first end of the capacitor C15, and the second end of the capacitor C15 is connected to the second end of the bus capacitor. The two ends of the thirteenth bridge arm are connected to the two ends of the bus capacitor 200, the first end of the first primary winding is connected to the midpoint of the thirteenth bridge arm, and the second end of the first primary winding is connected to the second end of the capacitor C14.

[0084] In this embodiment, a first end of the first switch K1 is connected to a first end of the capacitor C7, a second end of the first switch K1 is connected to a first end of the battery 700, a first end of the second switch K2 is connected to a second end of the capacitor C7, and a second end of the second switch K2 is connected to a second end of the battery 700.

[0085] Please refer to the attached Figure 2The working principle of the functional module 400' of this example is described in detail. When the switch module 500 is disconnected, the functional module 400' can perform harmonic compensation on the bus voltage. Specifically, the functional module 400' can respectively realize the step-up and step-down working modes. When the switch module 500 is disconnected and the bus voltage is higher than the preset voltage, when the functional module 400' is in the step-down mode, the turns ratio of the first transformer T1 is preset, and the switching frequency of the twenty-fourth switch tube Q24 and the twenty-fifth switch tube Q25 are preset, so that the twenty-fourth switch tube Q24 and the twenty-fifth switch tube Q25 are alternately turned on to form an AC circuit, and the twenty-sixth switch tube Q26 and the twenty-seventh switch tube Q27 are turned off. The full-wave rectification method is adopted to adjust the output voltage by adjusting the duty cycle of the switch tube. When the switch module 500 is disconnected and the bus voltage is higher than the preset voltage, the functional module 400' is in the boost mode, the twenty-fourth switch tube Q24 and the twenty-fifth switch tube Q25 are turned off, and the uncontrolled rectification mode is adopted, by simultaneously turning on the twenty-sixth switch tube Q26 and the twenty-seventh switch tube Q27 to store energy for the inductor L9, and alternately turning off one of the twenty-sixth switch tube Q26 and the twenty-seventh switch tube Q27 to release energy for the inductor L9 to the primary side of the first transformer T1, thereby realizing the boost function. Therefore, the functional module 400' can perform harmonic compensation on the bus voltage to offset the secondary ripple at the bus capacitor 200 in the single-phase AC charging state.

[0086] According to the on-board charger of this embodiment, when any one of the second full-bridge inverter circuit, the third transformer T3, the second full-bridge rectifier circuit and the BUCK step-down circuit fails, that is, when the battery 700 cannot be charged through the DC / DC module 300, the first switch K1 and the second switch K2 can be closed, that is, the switch module 500 is turned on, so that the functional module 400' is connected to the battery 700 through the switch module 500. At this time, the functional module 400' can be used as an isolated DC-DC conversion circuit, and the bus voltage can be stepped down through the functional module 400' to charge the battery 700, thereby improving the reliability of the vehicle.

[0087] See attached Figure 3 An on-board charger according to the third embodiment of the present application is exemplarily described. The on-board charger is applied to a vehicle and is used to charge a power battery 600 and a storage battery 700 of the vehicle. The on-board charger includes a PFC module 100, a bus capacitor 200, a DC / DC module 300, a functional module 400", and a switch module 500. The PFC module 100, the bus capacitor 200, the DC / DC module 300, and the switch module 500 are the same as those in the above embodiment and will not be repeated here.

[0088] The first end of the functional module 400" is connected to the bus capacitor 200, the first end of the switch module 500 is connected to the second end of the functional module 400", and the second end of the switch module 500 is used to connect to the battery 700. The function switching of the functional module 400" is achieved by controlling the on and off of the switch module 500. On the one hand, when the switch module 500 is turned on, the functional module 400" can be connected to the battery 700 through the switch module 500 to reduce the voltage. On the other hand, when the switch module 500 is disconnected, the functional module 400" can perform harmonic compensation on the bus voltage.

[0089] The functional module 400" includes a switch circuit 410" and an LC circuit. The LC circuit includes an inductor L10 and a capacitor C8. The LC circuit is connected between the switch circuit 410" and the switch module 500. Therefore, when the switch module 500 is turned on, the inductor L10 can be charged and discharged to achieve voltage reduction by controlling the on and off of the switch circuit 410". For example, the on and off of the switch circuit 410" can be controlled first so that the bus voltage charges the inductor L10 and the battery 700 at the same time, and then the on and off of the switch circuit 410" can be controlled so that the inductor L10 charges the battery 700. Repeating the above process can reduce the bus voltage to charge the battery 700. When the switch module 500 is turned on, the bus voltage can be harmonically compensated by controlling the on and off of the switch circuit 410″ to charge and discharge the capacitor C8. Specifically, the first end of the inductor L10 is connected to the switch circuit 410″, the second end of the inductor L10 is connected to the switch module 500, the first end of the capacitor C8 is connected to the second end of the inductor L10, and the second end of the capacitor C8 is connected to one end of the switch circuit 410″. In this embodiment, the second end of the capacitor C8 is also connected to the switch module 500.

[0090] In an embodiment of the present application, when the switch module 500 is disconnected and the bus voltage is higher than the preset voltage, the switch circuit 410" is controlled to be on and off so that the bus voltage flows to the capacitor C8. During this process, the bus voltage decreases and the capacitor C8 is charged until the bus voltage is equal to the preset voltage. When the switch module 500 is disconnected and the bus voltage is lower than the preset voltage, the switch circuit 410" is controlled to be on and off so that the voltage of the capacitor C8 flows to the bus capacitor 200. During this process, the capacitor C8 is discharged and the bus voltage increases until the bus voltage is equal to the preset voltage. Among them, the bus voltage is the voltage across the bus capacitor 200. For example, the preset voltage is 390V. When the bus voltage is higher than 390V, the switch circuit 410" is controlled to be on and off so that the bus voltage flows to the capacitor C8; when the bus voltage is lower than 390V, the switch circuit 410" is controlled to be on and off so that the voltage of the capacitor C8 flows to the bus capacitor 200. By controlling in this way, the peak can be effectively cut and the valley can be filled, and the bus voltage can be harmonically compensated. In some other embodiments, the preset voltage can also be set to other values, and those skilled in the art can set it according to actual conditions.

[0091] See also Figure 3 In this embodiment, the switch circuit 410" includes a first full-bridge inverter circuit, a second transformer T2 and two switch tubes (i.e., switch tube Q32 and switch tube Q33). The second transformer T2 includes a second primary winding and a second secondary winding, the first full-bridge inverter circuit is connected to the second primary winding, the first end of the inductor L10 is connected to the midpoint of the second secondary winding, the second end of the inductor L10 is connected to the switch module 500, the first end of the capacitor C8 is connected to the second end of the inductor L10, the second end of the capacitor C8 is connected to the first end of the switch tube Q32 and the first end of the switch tube Q33 at the same time, the second end of the switch tube Q32 and the second end of the switch tube Q33 are respectively connected to the two ends of the second secondary winding.

[0092] Specifically, the first full-bridge inverter circuit includes a fifteenth bridge arm (the fifteenth bridge arm includes a switch tube Q28 and a switch tube Q29 connected in series in sequence) and a sixteenth bridge arm (the sixteenth bridge arm includes a switch tube Q30 and a switch tube Q31 connected in series in sequence), the two ends of the fifteenth bridge arm are connected to the two ends of the bus capacitor 200, the two ends of the sixteenth bridge arm are connected to the two ends of the bus capacitor 200, the first end of the second primary winding is connected to the midpoint of the sixteenth bridge arm, and the second end of the second primary winding is connected to the midpoint of the fifteenth bridge arm.

[0093] In this embodiment, a first end of the first switch K1 is connected to a first end of the capacitor C8, a second end of the first switch K1 is connected to a first end of the battery 700, a first end of the second switch K2 is connected to a second end of the capacitor C8, and a second end of the second switch K2 is connected to a second end of the battery 700.

[0094] See below Figure 3 The working principle of the functional module 400" of the present embodiment is described in detail. When the switch module 500 is disconnected, the functional module 400" can perform harmonic compensation on the bus voltage. Specifically, the functional module 400" can respectively realize the step-up and step-down working modes. When the switch module 500 is disconnected and the bus voltage is higher than the preset voltage, when the functional module 400" is in the step-down mode, the turns ratio of the second transformer T2 and the switching frequencies of the switch tubes Q28, Q29, Q30 and Q31 are preset, so that the switch tubes Q28, Q29, Q30 and Q31 are alternately turned on to form an AC circuit, and the switch tubes Q32 and Q33 are turned off. Full-wave rectification is adopted to adjust the output voltage by adjusting the duty cycle of the switch tubes. When the switch module 500 is disconnected and the bus voltage is higher than the preset voltage, the functional module 400" is in the boost mode, the switch tube Q28, the twenty-fifth switch tube Q29, the switch tube Q30 and the switch tube Q31 are turned off, and the uncontrolled rectification mode is adopted. By simultaneously turning on the switch tube Q32 and the switch tube Q33 to store energy for the inductor L10, and alternately turning off one of the switch tubes Q32 and Q33 to release energy for the inductor L10 to the primary side of the second transformer T2, the boost function is achieved. Therefore, the functional module 400" can perform harmonic compensation on the bus voltage to offset the secondary ripple at the bus capacitor 200 in the single-phase AC charging state.

[0095] According to the on-board charger of this embodiment, when any one of the second full-bridge inverter circuit, the third transformer T3, the second full-bridge rectifier circuit and the BUCK step-down circuit fails, that is, when the battery 700 cannot be charged through the DC / DC module 300, the first switch K1 and the second switch K2 can be closed, that is, the switch module 500 is turned on, so that the functional module 400" is connected to the battery 700 through the switch module 500. At this time, the functional module 400" can be used as an isolated DC-DC conversion circuit, and the bus voltage can be stepped down through the functional module 400" to charge the battery 700, thereby improving the reliability of the vehicle.

[0096] See attached Figure 4An exemplary description is given of the on-board charger according to the fourth embodiment of the present application. The on-board charger is applied to a vehicle and is used to charge the power battery 600 and the storage battery 700 of the vehicle. The on-board charger includes a PFC module 100, a bus capacitor 200 and a DC / DC module 300'. The on-board charger may also include the above functional module (not shown in the figure) and a switch module (not shown in the figure). The first end of the functional module is connected to the two ends of the bus capacitor 200, and the second end of the functional module is connected to the storage battery 700 through the switch module. The functional module may be the functional module 400, the functional module 400' or the functional module 400" in the above embodiment, and the switch module may be the switch module 500 in the above embodiment. Among them, the PFC module 100 and the bus capacitor 200 are the same as those in the above embodiment, and will not be repeated here.

[0097] See also Figure 4 In this embodiment, the DC / DC module 300' includes a third full-bridge inverter circuit, a fourth transformer T4, a third full-bridge rectifier circuit, a fourth full-bridge inverter circuit, a fifth transformer T5 and a third full-wave rectifier circuit. The first end of the third full-bridge inverter circuit is connected to the two ends of the bus capacitor 200. Specifically, the third full-bridge inverter circuit includes the seventeenth bridge arm (the seventeenth bridge arm includes a switch tube Q34 and a switch tube Q35 connected in series), the eighteenth bridge arm (the eighteenth bridge arm includes a switch tube Q36 and a switch tube Q37 connected in series), an inductor L11 and a capacitor C9, the two ends of the seventeenth bridge arm are respectively connected to the two ends of the bus capacitor 200, the two ends of the eighteenth bridge arm are respectively connected to the two ends of the bus capacitor 200, the first end of the inductor L11 is connected to the midpoint of the seventeenth bridge arm, and the first end of the capacitor C9 is connected to the midpoint of the eighteenth bridge arm. The fourth transformer T4 includes a fourth primary winding and a fifth secondary winding, and the fourth primary winding is connected to the second end of the third full-bridge inverter circuit. Specifically, the first end of the fourth primary winding is connected to the second end of the inductor L11, and the second end of the fourth primary winding is connected to the second end of the capacitor C9. The first end of the third full-bridge rectifier circuit is connected to the fifth secondary winding, and the second end of the third full-bridge rectifier circuit is connected to the battery 700. Specifically, the third full-bridge rectifier circuit includes a nineteenth bridge arm (the nineteenth bridge arm includes a switch tube Q38 and a switch tube Q39 connected in series), a twentieth bridge arm (the twentieth bridge arm includes a switch tube Q40 and a switch tube Q41 connected in series), an inductor L12 and a capacitor C10, the first end of the inductor L12 is connected to the first end of the fifth secondary winding, the first end of the capacitor C10 is connected to the second end of the fifth secondary winding, the midpoint of the nineteenth bridge arm is connected to the second end of the inductor L12, and the midpoint of the twentieth bridge arm is connected to the second end of the capacitor C10. Both ends of the nineteenth bridge arm and both ends of the twentieth bridge arm are connected to the positive and negative electrodes of the power battery 600.

[0098] The first end of the fourth full-bridge inverter circuit is connected to the second end of the third full-bridge rectifier circuit. Specifically, the fourth full-bridge inverter circuit includes a twenty-first bridge arm (the twenty-first bridge arm includes a switch tube Q42 and a switch tube Q43 connected in series) and a twenty-second bridge arm (the twenty-second bridge arm includes a switch tube Q44 and a switch tube Q45 connected in series), and the two ends of the twenty-first bridge arm are respectively connected to the two ends of the twentieth bridge arm, and the two ends of the twenty-second bridge arm are respectively connected to the two ends of the twentieth bridge arm. The fifth transformer T5 includes a fifth primary winding and a sixth secondary winding, and the fifth primary winding is connected to the second end of the fourth full-bridge inverter circuit. Specifically, the first end of the fifth primary winding is connected to the midpoint of the twenty-second bridge arm, and the second end of the fifth primary winding is connected to the midpoint of the twenty-first bridge arm. The first end of the third full-wave rectifier circuit is connected to the sixth secondary winding, and the second end of the third full-wave rectifier circuit is connected to the battery 700. Specifically, the third full-wave rectifier circuit includes a switch tube Q46, a switch tube Q47, an inductor L13 and a capacitor C11, the first end of the switch tube Q46 is connected to the first end of the sixth secondary winding, the first end of the switch tube Q47 is connected to the second end of the sixth secondary winding, the second end of the switch tube Q47 is connected to the second end of the switch tube Q46, the first end of the inductor L13 is connected to the center tap of the sixth secondary winding, the first end of the capacitor C11 is connected to the second end of the inductor L13, the second end of the capacitor C11 is connected to the second end of the switch tube Q46 and the second end of the switch tube Q47. Both ends of the capacitor C11 are also connected to the positive and negative electrodes of the battery 700.

[0099] In this embodiment, the third full-bridge rectifier circuit also includes a capacitor C12, and the two ends of the capacitor C12 are respectively connected to the two ends of the twentieth bridge arm. The fourth full-bridge inverter circuit also includes a capacitor C13, and the two ends of the capacitor C13 are respectively connected to the two ends of the twenty-first bridge arm. The DC / DC module 300' also includes a third EMI filter, and the third EMI filter is arranged between the power battery 600 and the capacitor C12 and the capacitor C13.

[0100] An embodiment of the present application also provides a vehicle, which includes the on-board charger as described above.

[0101] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0102] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0103] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0104] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0105] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0106] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

[0107] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0108] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0109] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0110] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0111] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0112] It should be noted that the above-mentioned embodiments illustrate rather than limit the invention and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims.

Claims

1. A vehicle-mounted charger, characterized in that: include: Bus capacitance; A functional module, wherein a first end of the functional module is connected to the bus capacitor; A switch module, wherein a first end of the switch module is connected to a second end of the functional module, and a second end of the switch module is used to be connected to a battery; Wherein, when the switch module is turned on, the functional module can be connected to the battery through the switch module for charging; When the switch module is disconnected, the functional module can perform harmonic compensation on the bus voltage, where the bus voltage is the voltage across the bus capacitor.

2. The vehicle-mounted charger according to claim 1, characterized in that: The functional module includes a switch circuit and an LC circuit, and the LC circuit is connected between the switch circuit and the switch module.

3. The vehicle-mounted charger according to claim 2, characterized in that: When the switch module is disconnected and the bus voltage is higher than a preset voltage, the switch circuit is controlled to be on and off so that the bus voltage flows to the capacitor in the LC circuit; When the switch module is disconnected and the bus voltage is lower than the preset voltage, the switch circuit is controlled to be on and off so that the voltage of the capacitor flows to the bus capacitor.

4. The vehicle-mounted charger according to claim 2, characterized in that: The LC circuit includes an inductor and a capacitor; The first end of the inductor is connected to the switch circuit, the second end of the inductor is connected to the switch module, the first end of the capacitor is connected to the second end of the inductor, and the second end of the capacitor is connected to one end of the switch circuit.

5. The vehicle-mounted charger according to claim 4, characterized in that: The switch circuit comprises a first bridge arm; The first end of the inductor is connected to the midpoint of the first bridge arm, the second end of the inductor is connected to the switch module, the first end of the capacitor is connected to the second end of the inductor, and the second end of the capacitor is connected to one end of the first bridge arm.

6. The vehicle-mounted charger according to claim 4, characterized in that: The switch circuit includes a half-bridge inverter circuit, a first transformer and two switch tubes; The first transformer includes a first primary winding and a first secondary winding, the half-bridge inverter circuit is connected to the first primary winding, the first end of the inductor is connected to the midpoint of the first secondary winding, the second end of the inductor is connected to the switch module, the first end of the capacitor is connected to the second end of the inductor, the second end of the capacitor is simultaneously connected to the first ends of the two switching tubes, and the second ends of the two switching tubes are respectively connected to the two ends of the first secondary winding.

7. The vehicle-mounted charger according to claim 4, characterized in that: The switch circuit includes a first full-bridge inverter circuit, a second transformer and two switch tubes; The second transformer includes a second primary winding and a second secondary winding, the first full-bridge inverter circuit is connected to the second primary winding, the first end of the inductor is connected to the midpoint of the second secondary winding, the second end of the inductor is connected to the switch module, the first end of the capacitor is connected to the second end of the inductor, the second end of the capacitor is simultaneously connected to the first ends of the two switching tubes, and the second ends of the two switching tubes are respectively connected to the two ends of the second secondary winding.

8. The vehicle-mounted charger according to any one of claims 1 to 7, characterized in that: The on-board charger also includes a PFC module and a DC / DC module; The PFC module is connected to the bus capacitor; The first end of the DC / DC module is connected to the bus capacitor, the second end of the DC / DC module is connected to the power battery, and the third end of the DC / DC module is connected to the storage battery.

9. The vehicle-mounted charger according to claim 8, characterized in that: The DC / DC module comprises: A second full-bridge inverter circuit, wherein a first end of the second full-bridge inverter circuit is connected to the bus capacitor; a third transformer, the third transformer comprising a third primary winding, a third secondary winding and a fourth secondary winding, the third primary winding being connected to the second end of the second full-bridge inverter circuit; a first full-bridge rectifier circuit, wherein a first end of the first full-bridge rectifier circuit is connected to the third secondary winding, and a second end of the first full-bridge rectifier circuit is connected to the power battery; a second full-bridge rectifier circuit, wherein a first end of the second full-bridge rectifier circuit is connected to the fourth secondary winding; A BUCK buck circuit, wherein a first end of the BUCK buck circuit is connected to a second end of the second full-bridge rectifier circuit, and a second end of the BUCK buck circuit is connected to the battery.

10. The vehicle-mounted charger according to claim 8, characterized in that: The DC / DC module comprises: A third full-bridge inverter circuit, a first end of the third full-bridge inverter circuit being connected to the bus capacitor; a fourth transformer, the fourth transformer comprising a fourth primary winding and a fifth secondary winding, the fourth primary winding being connected to the second end of the third full-bridge inverter circuit; a third full-bridge rectifier circuit, wherein a first end of the third full-bridge rectifier circuit is connected to the fifth secondary winding, and a second end of the third full-bridge rectifier circuit is connected to the battery; a fourth full-bridge inverter circuit, wherein a first end of the fourth full-bridge inverter circuit is connected to a second end of the third full-bridge rectifier circuit; a fifth transformer, the fifth transformer comprising a fifth primary winding and a sixth secondary winding, the fifth primary winding being connected to the second end of the fourth full-bridge inverter circuit; A third full-wave rectifier circuit, wherein a first end of the third full-wave rectifier circuit is connected to the sixth secondary winding, and a first end of the third full-wave rectifier circuit is connected to the battery.

11. The vehicle-mounted charger according to claim 8, characterized in that: The PFC module comprises: A second bridge arm, two ends of the second bridge arm are respectively connected to two ends of the bus capacitor; A third bridge arm, two ends of the third bridge arm are respectively connected to two ends of the bus capacitor; A fourth bridge arm, two ends of the fourth bridge arm are respectively connected to two ends of the bus capacitor; A fifth bridge arm, two ends of the fifth bridge arm are respectively connected to two ends of the bus capacitor; a second inductor, wherein a first end of the second inductor is connected to a midpoint of the second bridge arm, and a second end of the second inductor is connected to a first live wire end of the AC charging port; a third inductor, wherein a first end of the third inductor is connected to a midpoint of the third bridge arm, a switch, wherein a first end of the switch is connected to a second end of the third inductor, and a second end of the switch can be selectively connected to a first live wire end or a second live wire end of the AC charging port; a fourth inductor, wherein a first end of the fourth inductor is connected to a midpoint of the fourth bridge arm, and a second end of the fourth inductor is connected to a third live wire terminal of the AC charging port; A fifth inductor, wherein a first end of the fifth inductor is connected to a midpoint of the fifth bridge arm, and a second end of the fifth inductor is connected to a neutral line terminal of the AC charging port.

12. A vehicle, characterized in that: It comprises the on-board charger as claimed in any one of claims 1 to 11.

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