Charging Module, Method and Charging Device

Abstract

The present application provides a charging module, a method and a charging device. The charging module includes a three-phase rectification module, a bus capacitor module, a first switching module and a controller. The three-phase rectification module is electrically connected between the input power supply and the bus capacitor module. The three-phase rectification module includes a three-phase bridge arm. The bus capacitor module includes a first bus capacitor and a second bus capacitor. The first bus capacitor is electrically connected between the first output end of the three-phase bridge arm and the midpoint of the three-phase bridge arm. The second bus capacitor is electrically connected between the second output end of the three-phase bridge arm and the midpoint. The controller is configured to, when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, control the first switching module to connect the first bus capacitor in parallel with the first load and the second bus capacitor in parallel with the second load. The present application can achieve compatibility between AC charging and DC charging, improve the adaptability of the charging scenario, increase the charging power and charging speed, and has a simple structure and low cost.

Description

Technical Field

[0001] This application relates to the field of charging technologies, and in particular, to a charging module, a method, and a charging device. Background Art

[0002] A three-phase AC-DC compatible charging system can supply power from an external DC power source and can also supply power from an external AC power source. Therefore, three-phase AC-DC compatible charging systems have been widely promoted and applied in the charging scenarios of electric vehicles.

[0003] In a traditional three-phase AC-DC compatible charging system, in the scenarios of AC input and DC input, the charging system needs to detect the input voltage. When it detects an AC input, it can start the AC-DC rectification topology to work, perform DC-DC conversion under DC input, or directly connect the DC input port to the DC bus of the AC-DC. Therefore, the topology of the traditional three-phase AC-DC compatible charging system is very complex, the cost of the charging system is relatively high, and the charging efficiency is relatively low. Summary of the Invention

[0004] In view of this, this application provides a charging module, a method, and a charging device, which can achieve the compatibility of AC charging and DC charging, can increase the variation range of the DC voltage output by the charging module, can greatly improve the charging power and charging speed, and has a simple structure and low cost.

[0005] In a first aspect, this application provides a charging module, including a three-phase rectification module, a bus capacitor module, a first switch module, and a controller. The three-phase rectification module is electrically connected between an input power source and the bus capacitor module, and the three-phase rectification module includes three-phase bridge arms; the bus capacitor module includes a first bus capacitor and a second bus capacitor. The first bus capacitor is electrically connected between the first output end of the three-phase bridge arms and the midpoint of the three-phase bridge arms, and the second bus capacitor is electrically connected between the second output end of the three-phase bridge arms and the midpoint; the first switch module is electrically connected between the bus capacitor module and a first load and a second load; the controller is configured to, when the DC voltage output by the input power source is greater than or equal to a voltage threshold, control the first switch module to parallel the first bus capacitor with the first load and the second bus capacitor with the second load.

[0006] By adopting the embodiment of this application, the charging module can achieve the compatibility of AC input and DC input through the same topology structure, can greatly expand the adaptability of the charging scenario, and can reduce the system cost in the same scenario.

[0007] In a possible design, the charging module further includes a second switch module. The second switch module is electrically connected between the charging port and the three-phase rectification module. The second switch module includes a first switch, and the first switch is electrically connected between any two of the three-phase bridge arms. Based on such a design, a significant increase in the power of the three-phase rectification module under low-voltage DC input can be achieved.

[0008] In a possible design, the controller is further configured to, when the DC voltage output by the input power supply is less than the voltage threshold: control the first switch module to connect both the first load and the second load in parallel with the first bus capacitor, and short-circuit connect any two of the three-phase bridge arms. Based on such a design, the charging module can achieve a significant increase in the power of the three-phase rectification module under low-voltage DC input, and at the same time, the adaptability of the load can also be improved.

[0009] In a possible design, the first switch module includes a second switch and a third switch; a first end of the second switch is electrically connected to a first end of the second load, a second end of the second switch is electrically connected to a second end of the second bus capacitor, and a third end of the second switch is electrically connected to a first midpoint between the first bus capacitor and the second bus capacitor and a second end of the first load; a first end of the third switch is electrically connected to a second end of the second load, a second end of the third switch is electrically connected to the first midpoint between the first bus capacitor and the second bus capacitor, and a third end of the third switch is electrically connected to a first end of the first bus capacitor and a first end of the first load. Based on such a design, the charging module can improve the working range and voltage adaptability of the load.

[0010] In a possible design, the controller is further configured to, when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, control the first end of the second switch to be connected to the second end of the second switch, and control the first end of the third switch to be connected to the second end of the third switch. Based on such a design, the working range and voltage adaptability of the load can be improved.

[0011] In a possible design, the controller is further configured to, when the DC voltage output by the input power supply is less than the voltage threshold, control the first end of the second switch to be connected to the third end of the second switch, and control the first end of the third switch to be connected to the third end of the third switch. Based on such a design, the working range and voltage adaptability of the load can be improved.

[0012] In a possible design, the controller is further configured to control the connection between the first end and the second end of the second switch, and control the connection between the first end and the second end of the third switch when the input power supply outputs an AC voltage.

[0013] In a possible design, the three-phase rectification module further includes a fourth switch, a fifth switch, and a sixth switch; the fourth switch is electrically connected between the midpoint between the first phase leg and the first bus capacitor and the second bus capacitor, the fifth switch is electrically connected between the midpoint between the second phase leg and the first bus capacitor and the second bus capacitor, and the sixth switch is electrically connected between the midpoint between the third phase leg and the first bus capacitor and the second bus capacitor.

[0014] In a possible design, when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, the controller is further configured to: in a first time period of a cycle time, control the sixth switch to conduct, and control the fourth switch and the fifth switch to turn off, so that the second bus capacitor discharges to the second load, and the input power supply supplies power to the first bus capacitor and the first load; in a second time period of the cycle time, control the fourth switch, the fifth switch, and the sixth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the second bus capacitor, the first load, and the second load, and the second time period is after the first time period; in a third time period of the cycle time, control the fourth switch to conduct, and control the fifth switch and the sixth switch to turn off, so that the first bus capacitor discharges to the first load, and the input power supply supplies power to the second bus capacitor and the second load, and the third time period is after the second time period; in a fourth time period of the cycle time, control the fourth switch and the sixth switch to conduct, and control the fifth switch to turn off, so that the first bus capacitor discharges to the first load, and the second bus capacitor discharges to the second load, and the fourth time period is after the third time period. Based on such a design, the charging module can achieve DC bus voltage regulation, improve the compatibility of the voltage level of the subsequent load, ensure the high-efficiency operation of the subsequent power change, and at the same time maintain the voltage balance of the first bus capacitor and the second bus capacitor.

[0015] In a possible design, when the DC voltage output by the input power supply is less than the voltage threshold, the controller is further configured to: within a first time period of a cycle time, control the sixth switch to conduct and control the fourth switch and the fifth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load; within a second time period of the cycle time, control the fifth switch and the sixth switch to conduct and control the fourth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load, where the second time period is after the first time period; within a third time period of the cycle time, control the fourth switch, the fifth switch, and the sixth switch to conduct, so that the first bus capacitor discharges to the first load and the second load, where the third time period is after the second time period; within a fourth time period of the cycle time, control the fourth switch and the sixth switch to conduct and control the fifth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load, where the fourth time period is after the third time period. Based on such a design, DC bus voltage regulation can be achieved, the compatibility of the voltage levels of the subsequent loads can be improved, and the high-efficiency operation of the subsequent power variation can be ensured.

[0016] In a second aspect, the present application further provides a charging method applied to the charging module as described above. The charging method includes: detecting the voltage of the input power supply; when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, controlling the first switch module to connect the first bus capacitor in parallel with the first load and the second bus capacitor in parallel with the second load; when the DC voltage output by the input power supply is less than the voltage threshold, controlling the first switch module to control both the first load and the second load to be connected in parallel with the first bus capacitor, and controlling the second switch module to short-circuit connect any two of the three-phase bridge arms.

[0017] By adopting the embodiments of the present application, the charging method can greatly expand the adaptability of the charging scenario and can reduce the system cost in the same scenario.

[0018] In a possible design, it further includes: when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, controlling the first end of the second switch to be connected to the second end of the second switch, and controlling the first end of the third switch to be connected to the second end of the third switch. When the DC voltage output by the input power supply is less than the voltage threshold, controlling the first end of the second switch to be connected to the third end of the second switch, and controlling the first end of the third switch to be connected to the third end of the third switch. This charging method can improve the operating range and voltage adaptability of the load.

[0019] In a possible design, it further includes: when the input power supply outputs an AC voltage, controlling the first end of the second switch to be connected to the second end of the second switch, and controlling the first end of the third switch to be connected to the second end of the third switch.

[0020] In a possible design, when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, the charging method further includes: within the first time period of the cycle time, controlling the sixth switch to conduct and controlling the fourth switch and the fifth switch to turn off, so that the second bus capacitor discharges the second load, and the input power supply supplies power to the first bus capacitor and the first load; within the second time period of the cycle time, controlling the fourth switch, the fifth switch, and the sixth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the second bus capacitor, the first load, and the second load, and the second time period is after the first time period; within the third time period of the cycle time, controlling the fourth switch to conduct and controlling the fifth switch and the sixth switch to turn off, so that the first bus capacitor discharges the first load, and the input power supply supplies power to the second bus capacitor and the second load, and the third time period is after the second time period; within the fourth time period of the cycle time, controlling the fourth switch and the sixth switch to conduct and controlling the fifth switch to turn off, so that the first bus capacitor discharges the first load, and the second bus capacitor discharges the second load, and the fourth time period is after the third time period. Based on such a design, DC bus voltage regulation can be achieved, the compatibility of the voltage levels of the subsequent loads can be improved, the high-efficiency operation of the subsequent power change can be ensured, and at the same time, the voltage balance of the first bus capacitor and the second bus capacitor can be maintained.

[0021] In a possible design, when the DC voltage output by the input power supply is less than the voltage threshold, the charging method further includes: within a first time period of a cycle time, controlling the sixth switch to conduct and controlling the fourth and fifth switches to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load; within a second time period of the cycle time, controlling the fifth and sixth switches to conduct and controlling the fourth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load, where the second time period is after the first time period; within a third time period of the cycle time, controlling the fourth, fifth, and sixth switches to conduct, so that the first bus capacitor discharges to the first load and the second load, where the third time period is after the second time period; within a fourth time period of the cycle time, controlling the fourth and sixth switches to conduct and controlling the fifth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load, where the fourth time period is after the third time period. Based on such a design, DC bus voltage regulation can be achieved, the compatibility of the voltage level of the subsequent load can be improved, and the high-efficiency operation of the subsequent power change can be ensured.

[0022] In a third aspect, the present application further provides a charging device, which includes the charging module and a power supply as described above, and the power supply is used to supply power to the charging module.

[0023] The charging module, method, and charging device provided in the embodiments of the present application can achieve the compatibility of AC charging and DC charging, improve the adaptability of the charging scenario, greatly increase the charging power and charging speed, and have a simple structure and low cost. The embodiments of the present application can improve the change range of the DC voltage output by the charging module and the compatibility and flexibility of the operating modes of the loads carried by flexibly adjusting the series-parallel relationship of various loads at the subsequent stage of the charging module. Description of the Drawings

[0024] Figure 1 It is a schematic diagram of the application environment of a charging module provided in an embodiment of the present application.

[0025] Figure 2 It is another schematic diagram of the application environment of the charging module provided in an embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the structure of the charging module provided in an embodiment of the present application.

[0027] Figures 4A - 4C It is a schematic diagram of the structure of the power semiconductor switch provided in an embodiment of the present application.

[0028] Figure 5 The figure is a schematic diagram of the state of the charging module provided by the embodiment of the present application when the input is AC.

[0029] Figure 6 The figure is a schematic diagram of the charging module provided by the embodiment of the present application when the input is high DC voltage.

[0030] Figure 7A The figure is a switching timing diagram of the charging module provided by the embodiment of the present application when the input is high DC voltage.

[0031] Figures 7B - 7E The figure is a schematic diagram of the charging module provided by the embodiment of the present application when the input is high DC voltage.

[0032] Figure 8 The figure is a schematic diagram of the charging module provided by the embodiment of the present application when the input is low voltage DC.

[0033] Figure 9A The figure is a switching timing diagram of the charging module provided by the embodiment of the present application when the input is low voltage DC.

[0034] Figures 9B - 9E The figure is a schematic diagram of the charging module provided by the embodiment of the present application when the input is low voltage DC.

[0035] Figure 10 The figure is another schematic diagram of the structure of the charging module provided by the embodiment of the present application.

[0036] Figure 11 The figure is another schematic diagram of the structure of the charging module provided by the embodiment of the present application.

[0037] Figure 12 The figure is a flowchart of the charging method provided by the embodiment of the present application.

[0038] Figure 13 The figure is a schematic diagram of the structure of a charging device provided by the embodiment of the present application. Detailed implementation manners

[0039] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element. When an element is considered to be "disposed on" another element, it can be directly disposed on the other element or there may be an intermediate element.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0041] Generally, a three-phase AC-DC compatible charging system can be powered by an external DC power supply and can also be powered by an external AC power supply.

[0042] For example, in a possible scenario, the charging system can adopt a topology composed of fully controlled power devices. However, the cost of the charging system in this scenario is relatively high, and it does not have a cost advantage. Moreover, in the scenario of DC input, the charging system can only perform power conversion through some power devices in the bridge arm, and it is unable to disperse the power consumption, resulting in serious power derating. In addition, when the input voltage is low, the actual charging power of the charging system is small, which will reduce the competitiveness of the product.

[0043] In another possible scenario, the charging system can adopt the Vienna topology. In the scenario of low-voltage DC input, the charging system can only perform DC-DC conversion through one-half of the power diodes in the bridge arm. However, in this scenario, limited by the thermal and power consumption constraints of the diodes, the charging power of the charging system will drop significantly under low-voltage DC input, and the charging efficiency is low, which cannot meet the fast charging requirements. Therefore, how to reduce costs and achieve a large charging power as well as efficient and fast charging is an urgent problem to be solved.

[0044] To address the problems in the above scenarios, the embodiments of this application provide a charging module and method that can be compatible with AC and DC inputs, can achieve the compatibility of AC and DC of the charging module, can greatly improve the charging power and charging efficiency, and has the advantages of simple system structure and low cost.

[0045] Please refer to Figure 1 , Figure 1 which shows a schematic diagram of the application environment of a charging module 100 provided by an embodiment of this application.

[0046] In Figure 1 the shown scenario, the charging module 100 can be used to charge the electric vehicle 200 with an external power supply. It should be noted that in other embodiments of this application, the charging module 100 is not limited to being applied in the electric vehicle 200.

[0047] For example, the charging module 100 may be an on-vehicle charger in the electric vehicle 200. The AC power grid 210 may output AC electric energy to the AC charging pile 220, the AC charging pile 220 may output AC electric energy to the charging module 100, and the charging module 100 may process or convert the received AC electric energy and charge the battery 230 in the electric vehicle 200.

[0048] Please refer to Figure 2 , Figure 2 which shows another application environment schematic diagram of the charging module 100 according to an embodiment of the present application.

[0049] In Figure 2 the scenario shown, the charging module 100 may be applied to the DC charging pile 250. The AC power grid 210 may output AC electric energy to the transformer 240, the transformer 240 converts and outputs AC electric energy to the DC charging pile 250, and the DC charging pile 250 processes or converts the AC electric energy to charge the battery 230 in the electric vehicle 200.

[0050] It can be understood that in some possible application scenarios, the charging module 100 may be applied to DC charging piles, on-vehicle chargers, high-power charging piles, ultra-high-power charging piles, portable charging piles, etc.

[0051] Please refer to Figure 3 , Figure 3 which shows a schematic diagram of a charging module 100 compatible with AC and DC inputs provided by an embodiment of the present application.

[0052] In this embodiment, the charging module 100 may include a charging port 10, a switch module 20, a three-phase rectification module 40, a bus capacitor module 50, a controller 60, and a switch module 70.

[0053] The charging port 10 may be used to electrically connect to an input power supply, and the input power supply may be an AC power supply or a DC power supply.

[0054] For example, the charging port 10 may be electrically connected to the AC power supply 300 or the DC power supply 400. It can be understood that both the AC power supply 300 and the DC power supply 400 may be the input power supplies in this embodiment, and the input power supply supplies power to the charging module 100. As Figure 3 shown, the charging port 10 may include a first connection end P1, a second connection end P2, and a third connection end P3. The AC power supply 300 may include a first output end M1, a second output end M2, and a third output end M3. The DC power supply 400 may include a first output end N1 and a second output end N2.

[0055] If the charging port 10 is electrically connected to the AC power supply 300, the first connection terminal P1 of the charging port 10 can be electrically connected to the first output terminal M1 of the AC power supply 300, the second connection terminal P2 of the charging port 10 can be electrically connected to the second output terminal M2 of the AC power supply 300, and the third connection terminal P3 of the charging port 10 can be electrically connected to the third output terminal M3 of the AC power supply 300.

[0056] If the charging port 10 is electrically connected to the DC power supply 200, the first connection terminal P1 of the charging port 10 can be electrically connected to the first output terminal N1 of the DC power supply 400, and the third connection terminal P3 of the charging port 10 can be electrically connected to the second output terminal N2 of the DC power supply 400.

[0057] The bus capacitor module 50 can be electrically connected to the three-phase rectification module 40, and the switch module 70 can be electrically connected between the load and the bus capacitor module 50.

[0058] It can be understood that in this embodiment, the three-phase rectification module 40 can be used to process the AC power supply 300 or the DC power supply 400. For example, in one scenario, the three-phase rectification module 40 can be used to convert the AC voltage output by the AC power supply 300 into a DC voltage, and this DC voltage can be used to supply power to an external load. In another scenario, the three-phase rectification module 40 can also be used to convert the DC voltage output by the DC power supply 400 and output a DC voltage to supply power to an external load.

[0059] It can be understood that the switch module 20 can be electrically connected between the charging port 10 and the three-phase rectification module 40. In some possible embodiments, the three-phase rectification module 40 can include three-phase bridge arms connected in parallel, the switch module 20 can be electrically connected between any two of the three-phase bridge arms, and the switch module 20 can short-circuit any two of the three-phase bridge arms.

[0060] For example, as Figure 3 shown, the switch module 20 can be electrically connected between the first connection terminal P1 and the second connection terminal P2, that is, the switch module 20 can be electrically connected between the U-phase bridge arm and the V-phase bridge arm.

[0061] Optionally, the switch module 20 may include a switch K1. The first end of the switch K1 may be connected to the controller 60. The second end of the switch K1 may be electrically connected to the first connection end P1. The third end of the switch K1 may be electrically connected to the second connection end P2. It can be understood that the first end of the switch K1 may serve as the control end of the switch K1, that is, the controller 60 may output a signal to the first end of the switch K1 to control the state of the switch K1. For example, the controller 60 may control the conduction or cut-off of the switch K1. Optionally, the controller 60 may be signal-connected to the first end of the switch K1, or the controller 60 may also be electrically connected to the first end of the switch K1.

[0062] It can be understood that in this embodiment, the three-phase rectification module 40 may include three-phase bridge arms connected in parallel, and the three-phase bridge arms may include a first-phase bridge arm U, a second-phase bridge arm V, and a third-phase bridge arm W.

[0063] The first-phase bridge arm U may include a first diode D1 and a second diode D2. The second-phase bridge arm V may include a third diode D3 and a fourth diode D4. The third-phase bridge arm W may include a fifth diode D5 and a sixth diode D6.

[0064] In this embodiment, the anode of the first diode D1 may be electrically connected to the cathode of the second diode D2. The cathode of the first diode D1 may be electrically connected to the cathodes of the third diode D3 and the fifth diode D5. The anode of the second diode D2 may be electrically connected to the anodes of the fourth diode D4 and the sixth diode D6. The anode of the third diode D3 may be electrically connected to the cathode of the fourth diode D4. The anode of the fifth diode D5 may be electrically connected to the cathode of the sixth diode D6. The cathode of the fifth diode D5 may also be electrically connected to the bus capacitor module 50. The anode of the sixth diode D6 may also be electrically connected to the bus capacitor module 50.

[0065] It can be understood that the three-phase rectification module 40 in this embodiment may further include a second switch module 42. The second switch module 42 may include a switch S1, a switch S2, and a switch S3.

[0066] The first end of the switch S1 can be connected to the controller 60, the second end of the switch S1 can be electrically connected to a midpoint A between the first diode D1 and the second diode D2, and the third end of the switch S1 can be electrically connected to the bus capacitor module 50, the third end of the switch S2, and the third end of the switch S3. It can be understood that the first end of the switch S1 can serve as the control end of the switch S1. That is, the controller 60 can control the state of the switch S1. For example, the controller 60 can control the conduction or turn-off of the switch S1. Optionally, the controller 60 can be signal-connected to the first end of the switch S1, or the controller 60 can also be electrically connected to the first end of the switch S1.

[0067] The first end of the switch S2 can be connected to the controller 60, the second end of the switch S2 can be electrically connected to a midpoint B between the third diode D3 and the fourth diode D4, and the third end of the switch S2 can be electrically connected to the bus capacitor module 50, the third end of the switch S1, and the third end of the switch S3. It can be understood that the first end of the switch S2 can serve as the control end of the switch S2. That is, the controller 60 can control the state of the switch S2. For example, the controller 60 can control the conduction or turn-off of the switch S2. Optionally, the controller 60 can be signal-connected to the first end of the switch S2, or the controller 60 can also be electrically connected to the first end of the switch S2.

[0068] The first end of the switch S3 can be connected to the controller 60, the second end of the switch S3 can be electrically connected to a midpoint C between the fifth diode D5 and the sixth diode D6, and the third end of the switch S3 can be electrically connected to the bus capacitor module 50, the third end of the switch S1, and the third end of the switch S2. It can be understood that the first end of the switch S3 can serve as the control end of the switch S3. That is, the controller 60 can control the state of the switch S3. For example, the controller 60 can control the conduction or turn-off of the switch S3. Optionally, the controller 60 can be signal-connected to the first end of the switch S3, or the controller 60 can also be electrically connected to the first end of the switch S3.

[0069] It can be understood that in this embodiment, the three-phase rectification module 40 may further include a first inductor L1, a second inductor L2, and a third inductor L3.

[0070] The first end of the first inductor L1 may be electrically connected to the first connection terminal P1, and the second end of the first inductor L1 may be electrically connected to the midpoint A. The first end of the second inductor L2 may be electrically connected to the second connection terminal P2, and the second end of the second inductor L2 may be electrically connected to the midpoint B. The first end of the third inductor L3 may be electrically connected to the third connection terminal P3, and the second end of the third inductor L3 may be electrically connected to the midpoint C.

[0071] It can be understood that in other possible implementation manners, the second end of the switch K1 may be electrically connected to the first connection terminal P1, the third end of the switch K1 may be electrically connected to the third connection terminal P3, or the second end of the switch K1 may be electrically connected to the second connection terminal P2, and the third end of the switch K1 may be electrically connected to the third connection terminal P3.

[0072] It can be understood that in a possible scenario, the switches S1 - S3 can all be implemented by the structure as Figure 4A shown. Among them, the switches S1 - S3 can all include a power transistor Q1 and a power transistor Q2. The power transistor Q1 can include a switching transistor T1 and a diode DT1, and the power transistor Q2 can include a switching transistor T2 and a diode DT2. The first end of the switching transistor T1 is electrically connected to the controller 60, the second end of the switching transistor T1 is electrically connected to the cathode of the diode DT1, and the third end of the switching transistor T1 is electrically connected to the anode of the diode DT1 and the third end of the switching transistor T2. The first end of the switching transistor T2 is electrically connected to the controller 60, the second end of the switching transistor T2 is electrically connected to the cathode of the diode DT2, and the third end of the switching transistor T2 is electrically connected to the anode of the diode DT2.

[0073] It can be understood that as Figure 4A shown, the cathode of the diode DT1 and the second end of the switching transistor T1 can be used as the first end or the second end of the switches S1 - S3, and the cathode of the diode DT2 and the second end of the switching transistor T2 can be used as the first end or the second end of the switches S1 - S3.

[0074] It can be understood that in another possible scenario, the switches S1 - S3 can all be implemented by the structure as Figure 4B shown. Among them, the switches S1 - S3 can all include a power transistor Q1 and diodes DT2 - DT5.

[0075] The power transistor Q1 may include a switching transistor T1 and a diode DT1. The first end of the switching transistor T1 is electrically connected to the controller 60, the second end of the switching transistor T1 is electrically connected to the cathode of the diode DT1, and the third end of the switching transistor T1 is electrically connected to the anode of the diode DT1. The cathode of the diode DT2 is electrically connected to the cathode of the diode DT4 and the second end of the switching transistor T1, the anode of the diode DT2 is electrically connected to the cathode of the diode DT3, and the anode of the diode DT3 is electrically connected to the anode of the diode DT5 and the third end of the switching transistor T1. The cathode of the diode DT5 is electrically connected to the anode of the diode DT4.

[0076] It can be understood that, as Figure 4B shown, the node between the anode of the diode DT2 and the cathode of the diode DT3 may serve as the first end or the second end of the switches S1 - S3. The node between the anode of the diode DT4 and the cathode of the diode DT5 may serve as the first end or the second end of the switches S1 - S3.

[0077] It can be understood that in another possible scenario, the switches S1 - S3 can all be implemented through a structure as Figure 4C shown. Among them, the switches S1 - S3 can all include a power transistor Q1, a power transistor Q2, and diodes DT3 - DT4.

[0078] The power transistor Q1 may include a switching transistor T1 and a diode DT1, and the power transistor Q2 may include a switching transistor T2 and a diode DT2. The first end of the switching transistor T1 is electrically connected to the controller 60, the second end of the switching transistor T1 is electrically connected to the cathode of the diode DT1 and the cathode of the diode DT3, and the third end of the switching transistor T1 may be electrically connected to the anode of the diode DT1 and the second end of the switching transistor T2. The second end of the switching transistor T2 is electrically connected to the cathode of the diode DT2, the third end of the switching transistor T2 is electrically connected to the anode of the diode DT2 and the anode of the diode DT4, and the cathode of the diode DT4 is electrically connected to the anode of the diode DT3. The cathode of the diode DT4 is electrically connected to the anode of the diode DT3.

[0079] It can be understood that, as Figure 4C shown, the node between the anode of the diode DT3 and the cathode of the diode DT4 may serve as the first end or the second end of the switches S1 - S3. The node between the third end of the switching transistor T1 and the second end of the switching transistor T2 may serve as the first end or the second end of the switches S1 - S3.

[0080] It can be understood that in a specific implementation manner, the second end of the first inductor L1 can be electrically connected to the midpoint U between the first diode D1 and the second diode D2, the second end of the second inductor L2 can be electrically connected to the midpoint V between the third diode D3 and the fourth diode D4, and the second end of the third inductor L3 can be electrically connected to the midpoint W between the fifth diode D5 and the sixth diode D6.

[0081] It can be understood that in this embodiment, the first inductor L1, the second inductor L2, and the third inductor L3 can be used for energy storage and filtering during the on and off processes of the switches S1, S2, and S3. The bus capacitor module 50 can be used for energy storage and voltage stabilization of the DC side bus.

[0082] In a specific implementation manner, the bus capacitor module 50 can include a first bus capacitor C1 and a second bus capacitor C2. The first bus capacitor C1 can be electrically connected to the first output end of the three-phase bridge arm and the midpoint O of the three-phase bridge arm, and the second bus capacitor C2 can be electrically connected to the second output end of the three-phase bridge arm and the midpoint O of the three-phase bridge arm.

[0083] Specifically, the first end of the first bus capacitor C1 can be electrically connected to the cathodes of the first diode D1, the third diode D3, and the fifth diode D5. The second end of the first bus capacitor C1 can be electrically connected to the first end of the second bus capacitor C2. The second end of the second bus capacitor C2 can be electrically connected to the anodes of the second diode D2, the fourth diode D4, and the sixth diode D6. The third ends of the switch S1, the switch S2, and the switch S3 can be electrically connected to the midpoint O between the first bus capacitor C1 and the second bus capacitor C2.

[0084] It can be understood that the switch module 70 can be connected to the controller 60, and the controller 60 can output signals to the switch module 70 to control the state of the switch module 70.

[0085] In a specific implementation process, the switch module 70 can include a switch K2 and a switch K3. In this embodiment, the switch K2 can be a single-pole double-throw switch. The first end 1 of the switch K2 can be electrically connected to the first end of the second load 90. The second end 2 of the switch K2 can be electrically connected to the second end of the second bus capacitor C2. The third end 3 of the switch K2 can be electrically connected to the midpoint O between the first bus capacitor C1 and the second bus capacitor C2 and the second end of the first load 80.

[0086] In this embodiment, the switch K2 can be electrically connected to the controller 60. It can be understood that the controller can output a signal to the switch K2 to control the connection between the first end 1 and the second end 2 of the switch K2 or control the connection between the first end 1 and the third end 3 of the switch K2.

[0087] In this embodiment, the switch K3 can be a single-pole double-throw switch. The first end 1 of the switch K3 can be electrically connected to the second end of the second load 90. The second end 2 of the switch K3 can be electrically connected to the midpoint O between the first bus capacitor C1 and the second bus capacitor C2. The third end 3 of the switch K3 can be electrically connected to the first end of the first bus capacitor C1 and the first end of the first load 80.

[0088] In this embodiment, the switch K3 can be electrically connected to the controller 60. It can be understood that the controller can output a signal to the switch K3 to control the connection between the first end 1 and the second end 2 of the switch K3 or control the connection between the first end 1 and the third end 3 of the switch K3.

[0089] It can be understood that the charging module 100 of the embodiment of the present application introduces the switches K2 and K3 into the DC bus. Based on such a design, the charging module of the present application can achieve flexible docking between the three-phase rectification module 40 and the subsequent load, and the loads can operate in series or in parallel, greatly improving the compatibility of the charging module.

[0090] It can be understood that in other implementation manners of the present application, the switches K1-K3 can also be power semiconductor switches (such as bidirectional solid-state switches composed of IGBT, MOSFET, SCR, or GTO, etc.), and the switches K1-K3 can also be mechanical switches composed of relays, contactors, circuit breakers, etc.

[0091] It can be understood that the first load 80 and the second load 90 can include but are not limited to any one of a DC resistive load, a full-bridge / half-bridge resonant converter, a dual-active-bridge converter, and a Buck / Boost converter.

[0092] It can be understood that the controller 60 in this embodiment can be used to detect the type of the input power supply. The controller 60 can correspondingly control the charging state of the charging module 100 according to the detected type of the input power supply.

[0093] For example, the controller 60 can detect the characteristics of the input voltage. When the input power supply is the AC power supply 300, the controller 60 can control the charging module 100 to perform AC-DC processing based on the three-phase rectification module 40 of the Vienna topology, and correspondingly control the states of the switch K1, the switch K2, and the switch K3. When the input power supply is the DC power supply 400, the controller 60 can control the charging module 100 to perform DC-DC processing based on the three-phase rectification module 40 of the Vienna topology, and correspondingly control the states of the switch K1, the switch K2, and the switch K3.

[0094] The working states of the charging module 100 will be described by way of example below.

[0095] As Figure 5 shown, it is a schematic diagram of the state when the input power supply of the charging module 100 is an AC input. The first connection end P1, the second connection end P2, and the third connection end P3 of the charging port 10 are respectively electrically connected to the first output end M1, the second output end M2, and the third output end M3 of the AC power supply 300. The controller 60 controls the switch K1 to turn off, the first end 1 of the switch K2 is connected to the second end 2, and the first end 1 of the switch K3 is connected to the second end 2, so that the first load 80 and the second load 90 work in series. Among them, the first load 80 is connected in parallel with the first bus capacitor C1, and the second load 90 is connected in parallel with the second bus capacitor C2. Therefore, the first load 80 and the second load 90 can perform AC-DC power conversion through the three-phase rectification module 40 to obtain energy from the AC side.

[0096] It can be understood that when the charging module 100 is in the AC-DC working mode, the diodes in the three-phase bridge arm can be in a semi-alternating-current cycle state, that is, the diodes connected to the first bus capacitor C1 (such as diode D1, diode D3, and diode D5) only work in the positive half-wave cycle of the alternating voltage. The diodes connected to the second bus capacitor C2 (such as diode D2, diode D4, and diode D6) only work in the negative half-wave cycle of the alternating voltage. It can be understood that the switches in the three-phase bridge arm (such as switches S1-S3) are always in the working state.

[0097] It can be understood that when the charging module 100 is in single-phase AC input and operates in single-phase AC-DC mode, two output terminals (such as the first output terminal M1 and the second output terminal M2) of the AC power supply 300 are connected to two connection terminals (such as the first connection terminal P1 and the second connection terminal P2) of the charging port. The switch K1 is in the off state, the first end 1 of the switch K2 is connected to the second end 2, and the first end 1 of the switch K3 is connected to the second end 2. The three-phase rectification module 40 is in the full DC bus working state. The first load 80 is connected in parallel with the first bus capacitor C1, and the second load 90 is connected in parallel with the second bus capacitor C2. The first load 80 and the second load 90 perform AC-DC power conversion through the three-phase rectification module 40 to obtain energy from the AC side power supply.

[0098] It can be understood that when the charging module is in single-phase AC-DC working mode, one phase bridge arm (such as the W-phase bridge arm) of the three-phase bridge arm is in the idle state. At this time, the power semiconductor switch (such as the switch S3) of this W-phase bridge arm is always in the off state, and the power semiconductor switches (such as the switch S1 and the switch S2) in the two-phase bridge arms (such as the U-phase bridge arm and the V-phase bridge arm) connected to the output terminals of the input power supply perform phase shift and high-frequency switching actions under the action of the control system. When the difference between the voltages at both ends of the first bus capacitor C1 and the second bus capacitor C2 is used as the basis for adjusting the phase shift angle, the balance of the bus Vbus+ and the bus Vbus- can be achieved.

[0099] It can be understood that as Figure 6 shown, it is a schematic diagram of the state when the DC voltage output by the input power supply of the charging module 100 is high-voltage DC electricity in a possible scenario. Among them, in this scenario, when the DC voltage is greater than or equal to the voltage threshold, that is, the DC voltage output by the input power supply can be called high-voltage DC electricity. Among them, the voltage threshold can be one-half of the voltage between the bus Vbus+ and the bus Vbus-. It can be understood that in this scenario, the input power supply connected to the charging port 10 is the DC power supply 400.

[0100] For example, in this possible scenario, the voltage between the bus Vbus+ and the bus Vbus- can be 800V, and the DC voltage output by the DC power supply 400 is greater than the voltage threshold. For example, the DC voltage output by the DC power supply 400 can be 400V or above. At this time, the DC voltage output by the input power supply of the charging module 100 is high-voltage DC electricity.

[0101] It can be understood that in this scenario, the first connection terminal P1 and the third connection terminal P3 of the charging port 10 are electrically connected to the first output terminal N1 and the second output terminal N2 of the DC power supply 400 respectively. In this scenario, the switch K1 is always in the off state, the first terminal 1 and the second terminal 2 of the switch K2 are connected, the first terminal 1 and the second terminal 2 of the switch K3 are connected, the first load 80 is connected in parallel with the first bus capacitor C1, and the second load 90 is connected in parallel with the second bus capacitor C2. The three-phase rectification module 40 in the charging module 100 can operate in the DC-DC mode. The first load 80 and the second load 90 can perform DC-DC power conversion through the three-phase rectification module 40 to obtain energy from the DC-side power supply. The specific implementation process can be referred to the following Figures 7A - 7E related descriptions.

[0102] Please refer to Figure 7A , Figure 7A which shows the switch timing diagram when the input power supply of the charging module 100 outputs high-voltage direct current.

[0103] In the time period from t0 to t1, the controller 60 can output a high-level signal to the switch S3, and can output a low-level signal to the switch S1 and the switch S2 to control the switch S3 to conduct, and the switches S1 and S2 to turn off, and the diode D1 can conduct. At this time, the second bus capacitor C2 discharges and supplies power to the second load 90, and the currents of the DC power supply 400, the first inductor L1 and the third inductor L3 supply power to the first bus capacitor C1 and the first load 80 at the same time. Among them, the current paths of the DC power supply 400, the first inductor L1 and the third inductor L3 are as shown in Figure 7B the line S71 in.

[0104] In the time period from t1 to t2, the controller 60 can output a low-level signal to the switches S1, S2 and S3 to control the switches S1, S2 and S3 to turn off, and the diodes D1 and D6 can conduct. At this time, the currents of the DC power supply 400, the first inductor L1 and the third inductor L3 can supply power to the first bus capacitor C1, the second bus capacitor C2, the first load 80 and the second load 90 at the same time. Among them, the current paths of the DC power supply 400, the first inductor L1 and the third inductor L3 are as shown in Figure 7C the line S72 in.

[0105] During the time period from t2 to t3, the controller 60 can output a high-level signal to the switch S1, and can output a low-level signal to the switch S2 and the switch S3, so as to control the switch S1 to conduct, and control the switches S2 and S3 to be turned off, and the diode D6 can conduct. At this time, the first bus capacitor C1 can discharge to supply power to the first load 80, and the currents of the DC power supply 400, the first inductor L1 and the third inductor L3 can supply power to the second bus capacitor C2 and the second load 90 at the same time. Among them, the current paths of the DC power supply 400, the first inductor L1 and the third inductor L3 are as shown in Figure 7D the line S73 in

[0106] During the time period from t3 to t4, the controller 60 can output a high-level signal to the switch S1 and the switch S3, and can output a low-level signal to the switch S2, so as to control the switches S1 and S3 to conduct, and control the switch S2 to be turned off. At this time, the first bus capacitor C1 can discharge to supply power to the first load 80, the second bus capacitor C2 discharges and supplies power to the second load 90, and the current of the DC power supply 400 can charge the first inductor L1 and the third inductor L3. Among them, the current paths of the DC power supply 400, the first inductor L1 and the third inductor L3 are as shown in Figure 7E the line S74 in

[0107] It can be understood that the time periods from t0 to t1, from t1 to t2, from t2 to t3, and from t3 to t4 are a switching cycle time T. Among them, the time period from t1 to t2 is after the time period from t0 to t1, the time period from t2 to t3 is after the time period from t1 to t2, and the time period from t3 to t4 is after the time period from t2 to t3.

[0108] As can be seen from the above Figures 7A - 7E it can be seen that the switches (such as the switch S1 and the switch S3) performing high-frequency switching actions in the three-phase rectification module 40 can perform phase-shifting at any angle, that is, the switches S1 and S3 can conduct or turn off simultaneously, or can work staggeredly according to the set phase-shifting angle. When the difference between the voltages at both ends of the first bus capacitor C1 and the second bus capacitor C2 is controlled as the basis for adjusting the phase-shifting angle, the balance of the bus Vbus+ and the bus Vbus- can be achieved. It can be understood that the embodiments of the present application can adjust the DC bus voltage by adjusting the time ratio of conduction and turn-off of the switches in the two working bridge arms of the three-phase rectification module 40, and further can increase the adaptability to the voltage levels of the first load 80 and the second load 90 connected to the subsequent stage.

[0109] It can be understood that, as Figure 8 shown, in another scenario, it is a schematic diagram of the state when the DC voltage output by the input power supply of the charging module 100 is low-voltage direct current. Among them, in this scenario, when the DC voltage is less than the voltage threshold, that is, the DC voltage output by the input power supply can be called low-voltage direct current. It can be understood that in this scenario, the input power supply connected to the charging port 10 is the DC power supply 400.

[0110] For example, in this scenario, the voltage between the midpoint O of the bus Vbus+ and the bus Vbus- can be 400V, and the voltage between the bus Vbus+ and the bus Vbus- can be 800V. Then the voltage threshold can be 400V. In this scenario, the DC voltage output by the DC power supply 400 can be below 400V. At this time, the DC voltage output by the input power supply of the charging module 100 is low-voltage direct current.

[0111] It can be understood that in this scenario, the first connection end P1 and the third connection end P3 of the charging port 10 are respectively electrically connected to the first output end N1 and the second output end N2 of the DC power supply 400. In this scenario, the switch K1 is always in the on state, the first end 1 and the third end 3 of the switch K2 are connected, the first end 1 and the third end 3 of the switch K3 are connected, and the first load 80 and the second load 90 are both connected in parallel across the two ends of the first bus capacitor C1. The three-phase rectification module 40 in the charging module 100 can operate in the DC-DC mode. The first load 80 and the second load 90 can perform DC-DC power conversion through the three-phase rectification module 40 to obtain energy from the DC-side power supply. The specific implementation process can be referred to the following Figures 9A - 9E related descriptions.

[0112] It can be understood that the charging module 100 of the embodiment of the present application can set the switch K1 at the AC port based on the Vienna topology. Based on such a design, the charging module of the present application can greatly improve the DC-DC working power under low-voltage DC input.

[0113] Please refer to Figure 9A , Figure 9A which shows the switch timing diagram of the charging module 100 when the input power supply outputs low-voltage direct current.

[0114] During the time period from t0 to t1, the controller 60 can output a high-level signal to the switch S3 and can output a low-level signal to the switch S1 and the switch S2 to control the switch S3 to conduct and control both the switch S1 and the switch S2 to turn off, and the diodes D1 and D3 can conduct. At this time, the currents of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 can simultaneously supply power to the first bus capacitor C1, the first load 80, and the second load 90. Among them, the current paths of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 are as Figure 9D shown by the line S93 in

[0115] During the time period from t1 to t2, the controller 60 can output a high-level signal to the switch S2 and the switch S3 and can output a low-level signal to the switch S1 to control both the switch S2 and the switch S3 to conduct and control the switch S1 to turn off, and the diode D1 can conduct. At this time, the currents of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 can simultaneously supply power to the first bus capacitor C1, the first load 80, and the second load 90. Among them, the current paths of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 are as Figure 9C shown by the line S92 in

[0116] During the time period from t2 to t3, the controller 60 can output a high-level signal to the switch S1, the switch S2, and the switch S3 to control the switch S1, the switch S2, and the switch S3 to conduct. At this time, the first bus capacitor C1 discharges and supplies power to the first load 80 and the second load 90. The DC power supply 400 charges the first inductor L1, the second inductor L2, and the third inductor L3. Among them, the current paths of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 are as Figure 9B shown by the line S91 in

[0117] During the time period from t3 to t4, the controller 60 can output a high-level signal to the switch S1 and the switch S3, and can output a low-level signal to the switch S2, so as to control the switch S1 and the switch S3 to be both turned on, and control the switch S2 to be turned off, and the diode D1 can be turned on. At this time, the currents of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 can supply power to the first bus capacitor C1, the first load 80, and the second load 90 simultaneously. Among them, the current paths of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 are as Figure 9E shown by the line S94 in

[0118] It can be understood that the time periods from t0 to t1, from t1 to t2, from t2 to t3, and from t3 to t4 are a switching cycle time T. Among them, the time period from t1 to t2 is after the time period from t0 to t1, the time period from t2 to t3 is after the time period from t1 to t2, and the time period from t3 to t4 is after the time period from t2 to t3.

[0119] As can be seen from the above Figures 9A - 9D In the three-phase rectification module 40, the two phase legs short-circuited by the switch K1 operate in parallel, and the switches (such as the switch S3) in the other phase leg can always be in the on state. Among them, the switches (such as the switch S1 and the switch S2) in the two parallel phase legs perform high-frequency switching actions and can work at any phase-shifting angle, that is, the switch S1 and the switch S2 can be turned on or off simultaneously, or can work in a staggered manner according to the set phase-shifting angle. When the phase-shifting stagger angle is 180°, the ripple of the DC input current is the smallest or the inductance of the inductor required by the charging module is the smallest.

[0120] It can be understood that the embodiments of the present application can adjust the voltage across the first bus capacitor C1 by adjusting the on-time and off-time ratios of the switches in the two working phase legs of the three-phase rectification module 40, and can increase the adaptability to the voltage levels of the first load 80 and the second load 90 connected to the subsequent stage.

[0121] Please refer to Figures 7B - 7E and Figures 9B - 9E, when the input power supply of the charging module 100 is a DC power supply, the bridge arm in operation in the three-phase rectification module 40 is always in a half-bridge arm operating state, that is, the diodes in the bridge arm connected to the DC positive-polarity incoming line of the input power supply and the first bus capacitor C1 can always be in an operating state, while the diodes connected to the second bus capacitor C2 are always in an idle state. Conversely, the diodes connected to the first bus capacitor C1 in the bridge arm connected to the DC negative-polarity incoming line of the input power supply are always in an idle state, while the diodes connected to the second bus capacitor C2 are always in an operating state.

[0122] It can be understood that in the scenario of DC input, the half-bridge arm operating state of the three-phase rectification module 40 will cause the diodes in operation to heat up severely. Under the condition that the heat dissipation condition remains unchanged, the output power of the charging module 100 needs to be reduced and derated operation is performed. In addition, when the DC input voltage level is relatively low, the output power of the charging module 100 needs to be further reduced.

[0123] When the DC input voltage level is relatively low, compared with Figures 7B - 7E the operation mode of Figures 9B - 9E the operation mode of can make two-phase bridge arms in the three-phase rectification module 40 operate in parallel and stagger through switch switching, and can further improve the output power of the system, so that high-power power supply can be provided for the subsequent load.

[0124] Based on the above embodiments, in the charging module 100 of the embodiments of the present application, the compatibility of AC input and DC input can be realized through the same topological structure, the adaptability of the charging scenario can be greatly expanded, and the system cost in the same scenario can be reduced. The embodiments of the present application can adjust the effective duty cycle of the power semiconductor switch under DC input to realize the regulation of the DC bus voltage, thereby improving the compatibility of the subsequent load voltage level and ensuring the high-efficiency operation of the subsequent power change.

[0125] Please refer to Figure 10 , Figure 10 as shown in the schematic diagram of a charging module 100 compatible with AC and DC inputs provided by another embodiment of the present application.

[0126] Different from Figure 3 the charging module 100 shown in the Figure 10As shown, in this embodiment, the first terminal 1 of the switch K2 can be electrically connected to the first terminal of the first load 80, the second terminal 2 of the switch K2 can be electrically connected to the first terminal of the first bus capacitor C1, and the third terminal 3 of the switch K2 can be electrically connected to the midpoint O between the first bus capacitor C1 and the second bus capacitor C2. The first terminal 1 of the switch K3 can be electrically connected to the second terminal of the first load 80, the second terminal 2 of the switch K3 can be electrically connected to the midpoint O between the first bus capacitor C1 and the second bus capacitor C2, the third terminal 3 of the switch K2, and the first terminal of the second load 90, and the third terminal 3 of the switch K3 can be electrically connected to the second terminal of the second bus capacitor C2 and the second terminal of the second load 90.

[0127] It can be understood that for the charging module 100 in this embodiment, when operating in the DC-DC mode under low-voltage DC input, by changing the polarity of the connection of the DC input line, the three-phase rectification module 40 can be made to operate in the negative half-bus state.

[0128] It can be understood that the charging module 100 in this embodiment can also achieve the compatibility of AC input and DC input through the same topology structure, which can greatly expand the adaptability of the charging scenario and reduce the system cost in the same scenario. The charging module 100 of this embodiment can also adjust the effective duty cycle of the power semiconductor switch under DC input to achieve the regulation of the DC bus voltage, thereby improving the compatibility of the voltage level of the subsequent load and ensuring the high-efficiency operation of the subsequent power change.

[0129] Please refer to Figure 11 , Figure 11 which shows a schematic diagram of a charging module 100 provided by another embodiment of the present application.

[0130] Different from Figure 3 the charging module 100 shown in the Figure 11 embodiment, as shown, in this embodiment, the midpoint of the three-phase rectification module 40 can lead out a neutral line N. The switch module 20 can also include a switch K4.

[0131] The first terminal of the switch K4 can be connected to the controller 60, the second terminal of the switch K4 can be electrically connected to the node between the second connection terminal P2 and the second inductor L2, and the third terminal of the switch K4 can be electrically connected to the node between the third connection terminal P3 and the third inductor L3. The first terminal of the switch K4 can be used as the control terminal of the switch K4, that is, the controller 60 can output a signal to the first terminal of the switch K4 to control the state of the switch K4. For example, the controller 60 can control the switch K4 to conduct or turn off.

[0132] It can be understood that in one scenario, when the input power supply is the AC power supply 300, the neutral line N can be in an idle state. In another scenario, when the input power supply is the DC power supply 400, the output terminal N of the DC power supply 400 is connected to the neutral line N of the three-phase rectification module 40, and the output terminal P of the DC power supply 400 is connected to the first connection terminal P1, the second connection terminal P2, and the third connection terminal of the charging port 10. In another implementation manner, the three-phase port can also be short-circuited through the switch K1 and the switch K4 of the charging module. Therefore, the power semiconductor switches of each phase bridge arm (such as the switch S1, the switch S2, and the switch S3) all perform high-frequency switching actions and can perform phase-shifting at any angle. When the interleaving angle is 120°, the charging module 100 of the embodiment of the present application can achieve the lowest ripple of the DC input current, and the inductance value constraint of the inductor is the smallest.

[0133] As Figure 11 shown in the embodiment, the three-phase rectification module 40 can operate in the DC half-bus state, and the connection manner of its subsequent load to the DC bus is the same as that in Figure 3 and Figure 10 . It can be understood that under the same DC voltage input, the output power of the charging module 100 in this embodiment can reach up to 1.5 times the single-bridge-arm AC power processing capacity at most.

[0134] Based on the above embodiments, the embodiments of the present application can achieve the compatibility of AC charging and DC charging, improve the adaptability of the charging scenario, can greatly improve the charging power and charging speed, and have a simple structure and low cost. The embodiments of the present application can improve the change range of the DC output voltage of the charging module, as well as the compatibility and flexibility of the working modes of the loads carried by flexibly adjusting the series-parallel relationship of various loads at the subsequent stage of the charging module.

[0135] Please refer to Figure 12 , Figure 12 which is a flowchart of a charging method compatible with AC input and DC input provided by an embodiment of the present application. The charging method can be applied to the charging module 100, and the charging method includes the following steps:

[0136] Step S121: Detect the voltage of the input power supply.

[0137] Taking Figure 3 the charging module 100 shown as an example for illustration,

[0138] it can be understood that the controller 60 can detect the voltage of the input power supply. The controller 60 can correspondingly control the charging state of the charging module 100 according to the detected voltage of the input power supply.

[0139] For example, the controller 60 can detect the characteristics of the input voltage. When the input power supply is the AC power supply 300, the controller 60 can control the charging module 100 to perform AC-DC processing based on the three-phase rectification module 40 of the Vienna topology, and correspondingly control the states of the switch K1, the switch K2, and the switch K3. When the input power supply is the DC power supply 400, the controller 60 can control the charging module 100 to perform DC-DC processing based on the three-phase rectification module 40 of the Vienna topology, and correspondingly control the states of the switch K1, the switch K2, and the switch K3.

[0140] Step S122: When the DC voltage output by the input power supply is greater than or equal to the voltage threshold, control the first switch module to connect the first bus capacitor in parallel with the first load and the second bus capacitor in parallel with the second load.

[0141] It can be understood that the charging module shown in Figure 6 will be used as an example for illustration.

[0142] When the DC voltage output by the DC power supply 400 is high-voltage DC electricity (that is, the DC voltage output by the DC power supply 400 is greater than or equal to the voltage threshold), the controller 60 will control the first end 1 and the second end 2 of the switch 2 to be connected, and will also control the first end 1 and the second end 2 of the switch K3 to be connected. The controller 60 will also control the switch K1 to be turned off.

[0143] The following will be combined with Figures 7A - 7E to elaborate on the charging method when the DC voltage output by the input power supply is greater than or equal to the voltage threshold.

[0144] As Figure 7A shown, in the time period from t0 to t1, the controller 60 can output a high-level signal to the switch S3, and can output a low-level signal to the switch S1 and the switch S2 to control the switch S3 to conduct, the switch S1 and the switch S2 to turn off, and the diode D1 to conduct. At this time, the second bus capacitor C2 discharges and supplies power to the second load 90, and the currents of the DC power supply 400, the first inductor L1, and the third inductor L3 supply power to the first bus capacitor C1 and the first load 80 at the same time. Among them, the current paths of the DC power supply 400, the first inductor L1, and the third inductor L3 are as shown in Figure 7B the line S71 in.

[0145] As Figure 7AAs shown, during the time period from t1 to t2, the controller 60 can output a low-level signal to the switch S1, the switch S2, and the switch S3 to control the switch S1, the switch S2, and the switch S3 to be all turned off, and the diode D1 and the diode D6 can be turned on. At this time, the currents of the DC power supply 400, the first inductor L1, and the third inductor L3 can supply power to the first bus capacitor C1, the second bus capacitor C2, the first load 80, and the second load 90 simultaneously. Among them, the current paths of the DC power supply 400, the first inductor L1, and the third inductor L3 are as Figure 7C shown by the line S72 in

[0146] As Figure 7A shown, during the time period from t2 to t3, the controller 60 can output a high-level signal to the switch S1 and can output a low-level signal to the switch S2 and the switch S3 to control the switch S1 to be turned on and control the switch S2 and the switch S3 to be all turned off, and the diode D6 can be turned on. At this time, the first bus capacitor C1 can discharge to supply power to the first load 80, and the currents of the DC power supply 400, the first inductor L1, and the third inductor L3 can supply power to the second bus capacitor C2 and the second load 90 simultaneously. Among them, the current paths of the DC power supply 400, the first inductor L1, and the third inductor L3 are as Figure 7D shown by the line S73 in

[0147] As Figure 7A shown, during the time period from t3 to t4, the controller 60 can output a high-level signal to the switch S1 and the switch S3 and can output a low-level signal to the switch S2 to control the switch S1 and the switch S3 to be all turned on and control the switch S2 to be turned off. At this time, the first bus capacitor C1 can discharge to supply power to the first load 80, the second bus capacitor C2 discharges and supplies power to the second load 90, and the current of the DC power supply 400 can charge the first inductor L1 and the third inductor L3. Among them, the current paths of the DC power supply 400, the first inductor L1, and the third inductor L3 are as Figure 7E shown by the line S74 in

[0148] Step S123: When the DC voltage output by the input power supply is less than the voltage threshold, by controlling the second switch module, the first load and the second load are both connected in parallel with the first bus capacitor, and any two-phase bridge arms in the three-phase bridge arm are short-circuited.

[0149] When the DC power supply 400 outputs low-voltage direct current (i.e., the DC voltage output by the DC power supply 400 is less than the voltage threshold), the controller 60 will control the first terminal 1 and the third terminal 3 of the switch K2 to be connected, and control the first terminal 1 and the third terminal 3 of the switch K3 to be connected. The controller 60 will also control the switch K1 to conduct. It can be understood that in this embodiment, when the DC voltage output by the DC power supply 400 is less than the voltage threshold, the controller 60 can control the state of the switch K1. For example, in some possible embodiments, the switch K1 can be electrically connected between any two phase arms of the three-phase bridge arm, and the switch module 20 can short-circuit any two phase arms of the three-phase bridge arm.

[0150] For example, in one implementation, the switch K1 can be electrically connected between the U-phase arm and the V-phase arm, that is, the switch K1 can conduct when the DC voltage output by the DC power supply 400 is less than the voltage threshold, so that the U-phase arm and the V-phase arm are short-circuited. In another implementation, the switch K1 can be electrically connected between the U-phase arm and the W-phase arm, that is, the switch K1 can conduct when the DC voltage output by the DC power supply 400 is less than the voltage threshold, so that the U-phase arm and the W-phase arm are short-circuited. In one implementation, the switch K1 can be electrically connected between the W-phase arm and the V-phase arm, that is, the switch K1 can conduct when the DC voltage output by the DC power supply 400 is less than the voltage threshold, so that the W-phase arm and the V-phase arm are short-circuited.

[0151] It can be understood that when the charging port 10 is connected to the AC power supply 300, the controller 60 will control the switch K2 to turn off, and control the first terminal 1 and the second terminal 2 of the switch K2 to be connected, and the first terminal 1 and the second terminal 2 of the switch K3 to be connected.

[0152] The following will be combined with Figures 9A - 9E to elaborate on the charging method when the DC voltage output by the input power supply is less than the voltage threshold.

[0153] As Figure 9A shown, in the time period from t0 to t1, the controller 60 can output a high-level signal to the switch S3, and can output a low-level signal to the switch S1 and the switch S2 to control the switch S3 to conduct, and control the switch S1 and the switch S2 to be turned off, and the diodes D1 and D3 can conduct. At this time, the currents of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 can supply power to the first bus capacitor C1, the first load 80, and the second load 90 at the same time. Among them, the current paths of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 are asFigure 9D as shown by line S93 in

[0154] As Figure 9A shown, during the time period from t1 to t2, the controller 60 can output a high-level signal to the switch S2 and the switch S3, and can output a low-level signal to the switch S1, so as to control both the switch S2 and the switch S3 to be turned on, and control the switch S1 to be turned off, and the diode D1 can be turned on. At this time, the currents of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 can supply power to the first bus capacitor C1, the first load 80, and the second load 90 simultaneously. Among them, the current paths of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 are as Figure 9C shown by line S92 in

[0155] As Figure 9A shown, during the time period from t2 to t3, the controller 60 can output a high-level signal to the switch S1, the switch S2, and the switch S3, so as to control the switch S1, the switch S2, and the switch S3 to be turned on. At this time, the first bus capacitor C1 discharges and supplies power to the first load 80 and the second load 90. The DC power supply 400 charges the first inductor L1, the second inductor L2, and the third inductor L3. Among them, the current paths of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 are as Figure 9B shown by line S91 in

[0156] As Figure 9A shown, during the time period from t3 to t4, the controller 60 can output a high-level signal to the switch S1 and the switch S3, and can output a low-level signal to the switch S2, so as to control both the switch S1 and the switch S3 to be turned on, and control the switch S2 to be turned off, and the diode D1 can be turned on. At this time, the currents of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 can supply power to the first bus capacitor C1, the first load 80, and the second load 90 simultaneously. Among them, the current paths of the DC power supply 400, the first inductor L1, the second inductor L2, and the third inductor L3 are as Figure 9E shown by line S94 in

[0157] It can be understood that as Figure 13As shown in the figure, an embodiment of the present application further provides a charging device 500. The charging device 500 may include the charging module 100 and the power supply 600 described in the above embodiments. The power supply 600 may supply power to the charging module 100. It can be understood that in some embodiments, the power supply 600 may be the input power supply in the above embodiments.

[0158] In some possible application scenarios, the charging device 500 may be, but is not limited to, a DC charging pile, an on-vehicle charger, a high-power charging pile, an ultra-high-power charging pile, a portable charging pile, etc.

[0159] The above is only a preferred embodiment of the present application, and it is not a limitation on any form of the present application. Although the present application has been disclosed as the preferred embodiment above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present application. However, as long as it does not depart from the technical content of the technical solution of the present application, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A charging module, characterized in that, it includes a three-phase rectifier module, a bus capacitor module, a first switch module and a controller; The three-phase rectifier module is electrically connected between the input power supply and the bus capacitor module, and the three-phase rectifier module includes three-phase bridge arms; The bus capacitor module includes a first bus capacitor and a second bus capacitor. The first bus capacitor is electrically connected between the first output terminal of the three-phase bridge arm and the midpoint of the three-phase bridge arm, and the second bus capacitor is electrically connected between the second output terminal of the three-phase bridge arm and the midpoint; The first switch module is electrically connected between the bus capacitor module and the first load and the second load; The controller is used to, when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, control the first switch module to make the first bus capacitor in parallel with the first load and the second bus capacitor in parallel with the second load; The first switch module includes a second switch and a third switch. The first end of the second switch is electrically connected to the first end of the second load, the second end of the second switch is electrically connected to the second end of the second bus capacitor, and the third end of the second switch is electrically connected to the midpoint between the first bus capacitor and the second bus capacitor and the second end of the first load; The first end of the third switch is electrically connected to the second end of the second load, the second end of the third switch is electrically connected to the midpoint between the first bus capacitor and the second bus capacitor, and the third end of the third switch is electrically connected to the first end of the first bus capacitor and the first end of the first load.

2. The charging module according to claim 1, characterized in that, the charging module further includes a second switch module. The second switch module is electrically connected between the charging port and the three-phase rectifier module. The second switch module includes a first switch, and the first switch is electrically connected between any two of the three-phase bridge arms.

3. The charging module according to claim 2, characterized in that, the controller is further used to, when the DC voltage output by the input power supply is less than the voltage threshold, control the first switch module to make both the first load and the second load in parallel with the first bus capacitor; and control the second switch module to short-circuit connect any two of the three-phase bridge arms.

4. The charging module according to claim 3, characterized in that, the controller is further used for: When the DC voltage output by the input power supply is greater than or equal to the voltage threshold, controlling the first end of the second switch to be connected to the second end of the second switch, and controlling the first end of the third switch to be connected to the second end of the third switch.

5. The charging module according to claim 3 or 4, characterized in that, the controller is further used for: When the DC voltage output by the input power supply is less than the voltage threshold, controlling the first end of the second switch to be connected to the third end of the second switch, and controlling the first end of the third switch to be connected to the third end of the third switch.

6. The charging module according to claim 3, It is characterized in that the controller is further configured to: when the input power supply outputs an AC voltage, control the first end of the second switch to be connected to the second end of the second switch, and control the first end of the third switch to be connected to the second end of the third switch.

7. The charging module according to claim 3, It is characterized in that the three-phase rectification module further includes a fourth switch, a fifth switch and a sixth switch; the fourth switch is electrically connected to the midpoint between the midpoint of the first-phase bridge arm and the midpoints between the first bus capacitor and the second bus capacitor, the fifth switch is electrically connected to the midpoint between the midpoint of the second-phase bridge arm and the midpoints between the first bus capacitor and the second bus capacitor, and the sixth switch is electrically connected to the midpoint between the midpoint of the third-phase bridge arm and the midpoints between the first bus capacitor and the second bus capacitor.

8. The charging module according to claim 7, It is characterized in that when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, the controller is further configured to: in a first time period of the cycle time, control the sixth switch to be turned on, and control the fourth switch and the fifth switch to be turned off, so that the second bus capacitor discharges to the second load, and the input power supply supplies power to the first bus capacitor and the first load; in a second time period of the cycle time, control the fourth switch, the fifth switch and the sixth switch to be turned off, so that the input power supply supplies power to the first bus capacitor, the second bus capacitor, the first load and the second load, and the second time period is after the first time period; in a third time period of the cycle time, control the fourth switch to be turned on, and control the fifth switch and the sixth switch to be turned off, so that the first bus capacitor discharges to the first load, and the input power supply supplies power to the second bus capacitor and the second load, and the third time period is after the second time period; in a fourth time period of the cycle time, control the fourth switch and the sixth switch to be turned on, and control the fifth switch to be turned off, so that the first bus capacitor discharges to the first load, and the second bus capacitor discharges to the second load, and the fourth time period is after the third time period.

9. The charging module according to claim 7, It is characterized in that when the DC voltage output by the input power supply is less than the voltage threshold, the controller is further configured to: in a first time period of the cycle time, control the sixth switch to be turned on, and control the fourth switch and the fifth switch to be turned off, so that the input power supply supplies power to the first bus capacitor, the first load and the second load; in a second time period of the cycle time, control the fifth switch and the sixth switch to be turned on, and control the fourth switch to be turned off, so that the input power supply supplies power to the first bus capacitor, the first load and the second load, and the second time period is after the first time period; During a third time period of the cycle time, control the fourth switch, the fifth switch, and the sixth switch to conduct, so that the first bus capacitor discharges the first load and the second load, and the third time period is after the second time period; During a fourth time period of the cycle time, control the fourth switch and the sixth switch to conduct, and control the fifth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load, and the fourth time period is after the third time period.

10. A charging method applied to a charging module, characterized in that, the charging module includes a three-phase rectification module, a bus capacitor module, a first switch module, a second switch module, and a controller. The three-phase rectification module is electrically connected between an input power supply and the bus capacitor module, and the three-phase rectification module includes three-phase bridge arms; the bus capacitor module includes a first bus capacitor and a second bus capacitor. The first bus capacitor is electrically connected between a first output end of the three-phase bridge arms and a midpoint of the three-phase bridge arms, and the second bus capacitor is electrically connected between a second output end of the three-phase bridge arms and the midpoint; the first switch module is electrically connected between the bus capacitor module and a first load and a second load; the second switch module is electrically connected between a charging port and the three-phase rectification module, and the second switch module includes a first switch. The first switch is electrically connected between any two of the three-phase bridge arms. The charging method includes: Detect the voltage of the input power supply; When the DC voltage output by the input power supply is greater than or equal to a voltage threshold, make the first bus capacitor in parallel with the first load and the second bus capacitor in parallel with the second load by controlling the first switch module; When the DC voltage output by the input power supply is less than the voltage threshold, control the first switch module to be in a second state to control both the first load and the second load to be in parallel with the first bus capacitor, and control the second switch module to conduct to control any two of the three-phase bridge arms to be short-circuited; The first switch module includes a second switch and a third switch; a first end of the second switch is electrically connected to a first end of the second load, a second end of the second switch is electrically connected to a second end of the second bus capacitor, and a third end of the second switch is electrically connected to a midpoint between the first bus capacitor and the second bus capacitor and a second end of the first load; a first end of the third switch is electrically connected to a second end of the second load, a second end of the third switch is electrically connected to the midpoint between the first bus capacitor and the second bus capacitor, and a third end of the third switch is electrically connected to a first end of the first bus capacitor and a first end of the first load; the charging method further includes: When the DC voltage output by the input power supply is greater than or equal to the voltage threshold, control the first end of the second switch to be connected to the second end of the second switch, and control the first end of the third switch to be connected to the second end of the third switch.

11. The charging method according to claim 10, wherein, the charging method further includes: When the DC voltage output by the input power supply is less than the voltage threshold, control the first end of the second switch to be connected to the third end of the second switch, and control the first end of the third switch to be connected to the third end of the third switch.

12. The charging method according to claim 11, wherein, it further includes: When the input power supply outputs an AC voltage, control the first end of the second switch to be connected to the second end of the second switch, and control the first end of the third switch to be connected to the second end of the third switch.

13. The charging method according to claim 10, wherein, the three-phase rectification module further includes a fourth switch, a fifth switch, and a sixth switch; the fourth switch is electrically connected between the midpoint of the first phase bridge arm and the midpoint between the first bus capacitor and the second bus capacitor, the fifth switch is electrically connected between the midpoint of the second phase bridge arm and the midpoint between the first bus capacitor and the second bus capacitor, and the sixth switch is electrically connected between the midpoint of the third phase bridge arm and the midpoint between the first bus capacitor and the second bus capacitor; when the DC voltage output by the input power supply is greater than or equal to the voltage threshold, the charging method further includes: In the first time period of the cycle time, control the sixth switch to conduct, and control the fourth switch and the fifth switch to turn off, so that the second bus capacitor discharges to the second load, and the input power supply supplies power to the first bus capacitor and the first load; In the second time period of the cycle time, control the fourth switch, the fifth switch, and the sixth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the second bus capacitor, the first load, and the second load, and the second time period is after the first time period; In the third time period of the cycle time, control the fourth switch to conduct, and control the fifth switch and the sixth switch to turn off, so that the first bus capacitor discharges to the first load, and the input power supply supplies power to the second bus capacitor and the second load, and the third time period is after the second time period; In the fourth time period of the cycle time, control the fourth switch and the sixth switch to conduct, and control the fifth switch to turn off, so that the first bus capacitor discharges to the first load, and the second bus capacitor discharges to the second load, and the fourth time period is after the third time period.

14. The charging method according to claim 13, wherein, when the DC voltage output by the input power supply is less than the voltage threshold, the charging method further includes: During a first time period of the cycle time, control the sixth switch to conduct and control the fourth switch and the fifth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load; During a second time period of the cycle time, control the fifth switch and the sixth switch to conduct and control the fourth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load, and the second time period is after the first time period; During a third time period of the cycle time, control the fourth switch, the fifth switch, and the sixth switch to conduct, so that the first bus capacitor discharges to the first load and the second load, and the third time period is after the second time period; During a fourth time period of the cycle time, control the fourth switch and the sixth switch to conduct and control the fifth switch to turn off, so that the input power supply supplies power to the first bus capacitor, the first load, and the second load, and the fourth time period is after the third time period.

15. A charging device, characterized in that, the charging device includes a power supply and the charging module according to any one of claims 1-9, and the power supply is used to supply power to the charging module.

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