Integrated system of electric vehicle wireless charging system and auxiliary power system

Abstract

The present invention relates to an integrated system of a wireless charging system and an auxiliary power supply system for electric vehicles. The system comprises a ground-side system and a vehicle-side system. The ground-side system includes a rectifier, a high-frequency inverter, a ground-side compensation network, and a transmitting coil. The vehicle-side system includes a receiving coil, a vehicle-side compensation network, a first active rectifier, a high-voltage battery, a transformer, a second active rectifier, and a low-voltage battery. The rectifier is connected to the power grid, which is then connected to the transmitting coil via a high-frequency inverter and the ground-side compensation network. The transmitting coil and the receiving coil are coupled via a magnetic field to transfer energy. The receiving coil is connected to the vehicle-side compensation network, which is also connected to the first active rectifier and the transformer. The first active rectifier is connected to the high-voltage battery, and the transformer is connected to the low-voltage battery via the second active rectifier. This integrated system has a simple structure, occupies a small vehicle volume, and improves power density.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging of electric vehicles, and in particular to an integrated system of a wireless charging system and an auxiliary power supply system for an electric vehicle. Background Art

[0002] The use of fossil fuels has led to numerous environmental problems, such as the greenhouse effect and air pollution. To address these issues, the development and utilization of renewable energy is essential. Carbon emissions from the transportation sector account for a significant proportion of total carbon emissions. Electric vehicles have experienced rapid growth over the past decade and play a crucial role in reducing carbon emissions from the transportation sector.

[0003] As an emerging technology, wireless power transfer (WPT) has attracted more and more attention. It has the advantages of safety, convenience, and weather resistance, and can be applied to consumer electronics, home appliances, drones, electric vehicles and other fields. Typical electric vehicle wireless charging systems are as follows: Figure 1 As shown in the figure, the power frequency AC power of the power grid is converted into DC through the rectifier, and then converted into AC through high frequency inversion. It then reaches the transmitting coil through the compensation network composed of capacitors and inductors. The transmitting coil transfers the energy to the receiving coil through magnetic field coupling, and then passes through the compensation network, rectification and filtering modules to charge the battery.

[0004] Auxiliary Power Module (APM) is a major power electronic device in electric vehicles. APM is a bridge connecting the high-voltage system and the low-voltage system in electric vehicles. It is an auxiliary power module that reduces the high-voltage DC bus voltage to the low-voltage bus voltage. Figure 2 shown.

[0005] In the wireless charging system of electric vehicles, wireless power transmission is used to charge the high-voltage battery, and the auxiliary power module is used to charge the low-voltage battery. The two systems will increase the cost and weight of the electric vehicle. Summary of the Invention

[0006] The object of the present invention is to provide an integrated system of a wireless charging system and an auxiliary power supply system for an electric vehicle, which has a simple structure, occupies a small volume in the vehicle, and has improved power density.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: an integrated system of a wireless charging system and an auxiliary power supply system for an electric vehicle, including a ground-side system and a vehicle-side system, the ground-side system including a rectifier, a high-frequency inverter, a ground-side compensation network and a transmitting coil, the vehicle-side system including a receiving coil, a vehicle-side compensation network, a first active rectifier, a high-voltage battery, a transformer, a second active rectifier and a low-voltage battery; the rectifier is connected to the power grid, the rectifier is connected to the transmitting coil via the high-frequency inverter and the ground-side compensation network, the transmitting coil and the receiving coil are coupled through a magnetic field to transfer energy; the receiving coil is connected to the vehicle-side compensation network, the vehicle-side compensation network is simultaneously connected to the first active rectifier and the transformer, the first active rectifier is connected to the high-voltage battery, and the transformer is connected to the low-voltage battery via the second active rectifier.

[0008] Furthermore, when the electric vehicle is wirelessly charged, electric energy is input from the power grid to charge the high-voltage battery and the low-voltage battery at the same time, and the first active rectifier and the vehicle-side compensation network serve as part of the high-voltage battery charging circuit; when the electric vehicle is not wirelessly charged, electric energy is transmitted from the high-voltage battery to the low-voltage battery through the first active rectifier, the vehicle-side compensation network, the transformer, and the second active rectifier in sequence to charge the low-voltage battery, and the first active rectifier and the vehicle-side compensation network serve as part of the high-voltage battery charging circuit for the low-voltage battery.

[0009] Furthermore, the compensation inductor in the vehicle-side compensation network serves as the primary-side inductor of the transformer.

[0010] Furthermore, the rectifier of the ground-side system adopts a three-phase rectifier, and the high-frequency inverter adopts an active H-bridge; in the vehicle-side system, the receiving coil is connected to a relay, the wireless charging system adopts an LCC-LCC topology, the first active rectifier adopts a bridge-type full-controlled rectifier, the auxiliary power supply system adopts a CLLC structure, and the second active rectifier adopts a bridge-type half-controlled rectifier; when the electric vehicle is wirelessly charged, the relay is closed, the transmitting coil charges the high-voltage battery, and at the same time charges the low-voltage battery through the auxiliary power supply system; when the electric vehicle is not wirelessly charged, the relay is opened, and the high-voltage battery charges the low-voltage battery through the auxiliary power supply system.

[0011] The present invention also provides another integrated system of a wireless charging system and an auxiliary power supply system for electric vehicles, including a ground-side system and a vehicle-side system, wherein the ground-side system includes a rectifier, a high-frequency inverter, a ground-side compensation network and a transmitting coil, and the vehicle-side system includes a receiving coil, a vehicle-side compensation network, a first active rectifier, a high-voltage battery, a coupling coil, a second active rectifier and a low-voltage battery; the rectifier is connected to the power grid, and the rectifier is connected to the transmitting coil via the high-frequency inverter and the ground-side compensation network, and the transmitting coil and the receiving coil are coupled through a magnetic field to transfer energy; the receiving coil is connected to the high-voltage battery via the vehicle-side compensation network and the first active rectifier, the coupling coil and the receiving coil are directly coupled, and the coupling coil is connected to the low-voltage battery via the second active rectifier.

[0012] Furthermore, when the electric vehicle is wirelessly charged, electric energy is input from the power grid to charge the high-voltage battery and the low-voltage battery at the same time; when the electric vehicle is not wirelessly charged, electric energy is transmitted from the high-voltage battery to the low-voltage battery through the first active rectifier, the vehicle-side compensation network, the receiving coil, the coupling coil, and the second active rectifier in sequence to charge the low-voltage battery.

[0013] Furthermore, the rectifier of the ground-side system adopts a three-phase rectifier, and the high-frequency inverter adopts an active H-bridge; in the vehicle-side system, the first active rectifier adopts a bridge-type full-controlled rectifier, and the second active rectifier adopts a bridge-type half-controlled rectifier.

[0014] Compared to existing technologies, the present invention offers the following advantages: It provides an integrated system combining an electric vehicle wireless charging system and an auxiliary power supply system. This system integrates the two systems, sharing some common components and simplifying the design. This system saves space on the vehicle side and improves power density. Furthermore, the integrated system allows for simultaneous charging of both high-voltage and low-voltage batteries, and even when wireless charging is not in progress, the high-voltage battery can charge the low-voltage battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a block diagram of the implementation principle of the wireless charging system for electric vehicles in the prior art.

[0016] Figure 2 This is a block diagram of the implementation principle of the auxiliary power supply module in the prior art.

[0017] Figure 3 This is a schematic diagram of the implementation principle of the integrated system of the first embodiment of the present invention.

[0018] Figure 4 This is a schematic diagram of the integrated system in working mode 1 in embodiment 1 of the present invention.

[0019] Figure 5This is a schematic diagram of the integrated system in working mode 2 in embodiment 1 of the present invention.

[0020] Figure 6 This is a topological diagram of the integrated system according to the first embodiment of the present invention.

[0021] Figure 7 This is a topological diagram of the integrated system in working mode 1 in embodiment 1 of the present invention.

[0022] Figure 8 This is a topology diagram of the integrated system in working mode 2 in embodiment 1 of the present invention.

[0023] Figure 9 Schematic diagram of the implementation principle of the integrated system of embodiment 2 of the present invention.

[0024] Figure 10 Schematic diagram of the integrated system in working mode 1 in embodiment 2 of the invention.

[0025] Figure 11 Schematic diagram of the integrated system in working mode 2 in embodiment 2 of the invention.

[0026] Figure 12 This is a topological structure diagram of the integrated system of the second embodiment of the present invention.

[0027] Figure 13 This is another topological structure diagram of the integrated system of the second embodiment of the present invention.

[0028] Figure 14 This is a schematic diagram of the active rectification structure in the third embodiment of the present invention.

[0029] Figure 15 This is a schematic diagram of the structure of a diode passive rectifier plus a DC / DC converter in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] like Figure 3 As shown, the first embodiment of the present invention provides an integrated system of a wireless charging system and an auxiliary power supply system for an electric vehicle, including a ground-side system and a vehicle-side system. The ground-side system includes a rectifier, a high-frequency inverter, a ground-side compensation network and a transmitting coil, and the vehicle-side system includes a receiving coil, a vehicle-side compensation network, a first active rectifier, a high-voltage battery, a transformer, a second active rectifier and a low-voltage battery; the rectifier is connected to the power grid, and the rectifier is connected to the transmitting coil via a high-frequency inverter and a ground-side compensation network, and the transmitting coil and the receiving coil are coupled through a magnetic field to transfer energy; the receiving coil is connected to the vehicle-side compensation network, and the vehicle-side compensation network is simultaneously connected to the first active rectifier and the transformer, the first active rectifier is connected to the high-voltage battery, and the transformer is connected to the low-voltage battery via the second active rectifier. As shown in FIG. Figure 2 Compared with the traditional auxiliary power supply system shown in FIG, in this integrated system, the auxiliary power supply system and the wireless charging system share the first active rectifier and the vehicle-side compensation network.

[0034] There are two ways to source energy from the low-voltage battery (24V): When the electric vehicle is wirelessly charged, the system is in working mode 1, and power is input from the grid to charge the high-voltage battery and the low-voltage battery (24V) at the same time. The first active rectifier and the vehicle-side compensation network are part of the high-voltage battery charging circuit. Figure 4 When the electric vehicle is not wirelessly charged, the system is in working mode 2. Electric energy is transmitted from the high-voltage battery to the low-voltage battery through the first active rectifier, the vehicle-side compensation network, the transformer, and the second active rectifier in sequence to charge the low-voltage battery. The first active rectifier and the vehicle-side compensation network serve as part of the structure of the high-voltage battery charging circuit for the low-voltage battery. Figure 5 shown.

[0035] In this embodiment, the compensation inductor in the vehicle-side compensation network serves as the primary-side inductor of the transformer, that is, the compensation inductor is shared with the primary-side inductor of the auxiliary power system transformer. By reusing some structures and integrating the two systems, the power density of the charging system can be improved and the cost can be reduced. The topology of the integrated system is as follows: Figure 6As shown. Among them, the rectifier of the ground side system adopts a three-phase rectifier, and the high-frequency inverter adopts an active H-bridge. In the vehicle side system, the receiving coil is connected to a relay, and the wireless charging system can adopt an LCC-LCC topology or other topologies. The first active rectifier adopts a bridge-type full-controlled rectifier, and the auxiliary power supply system adopts a CLLC structure. The second active rectifier can adopt a bridge-type half-controlled rectifier. The low-voltage side voltage is kept stable by phase shifting. A bridge-type full-controlled rectifier and a diode passive rectifier bridge plus a DC / DC converter can also be used. When the electric vehicle is wirelessly charged, the relay is closed, the transmitting coil charges the high-voltage battery, and at the same time the low-voltage battery is charged through the auxiliary power supply system, such as Figure 7 When the electric vehicle is not wirelessly charged, the relay is turned on and the high-voltage battery charges the low-voltage battery through the auxiliary power system, as shown in the figure. Figure 8 shown.

[0036] like Figure 9 As shown, Embodiment 2 of the present invention provides another integrated system of a wireless charging system and an auxiliary power supply system for electric vehicles, including a ground-side system and a vehicle-side system. The ground-side system includes a rectifier, a high-frequency inverter, a ground-side compensation network, and a transmitting coil, while the vehicle-side system includes a receiving coil, a vehicle-side compensation network, a first active rectifier, a high-voltage battery, a coupling coil, a second active rectifier, and a low-voltage battery. The rectifier is connected to the power grid, and the rectifier is connected to the transmitting coil via a high-frequency inverter and a ground-side compensation network. The transmitting coil and the receiving coil are coupled via a magnetic field to transfer energy. The receiving coil is connected to the high-voltage battery via the vehicle-side compensation network and the first active rectifier. The coupling coil is directly coupled to the receiving coil, and the coupling coil is connected to the low-voltage battery via the second active rectifier. The shared components include the first active rectifier, the vehicle-side compensation network, the receiving coil, etc.

[0037] Similar to the first embodiment, when the electric vehicle is wirelessly charged, the electric energy is input from the power grid to charge the high-voltage battery and the low-voltage battery at the same time. Figure 10 When the electric vehicle is not wirelessly charged, the electric energy is transmitted from the high-voltage battery to the low-voltage battery through the first active rectifier, the vehicle-side compensation network, the receiving coil, the coupling coil, and the second active rectifier in sequence to charge the low-voltage battery. Figure 11 shown.

[0038] A topological structure of the second embodiment is as follows Figure 12As shown. The ground-side system's rectifier uses a three-phase rectifier, and the high-frequency inverter uses an active H-bridge. In the vehicle-side system, the first active rectifier uses a bridge-type fully-controlled rectifier, and the second active rectifier uses a bridge-type half-controlled rectifier. When wirelessly charging an electric vehicle, both the high-voltage and low-voltage batteries are charged simultaneously. When not wirelessly charging, energy is transferred from the high-voltage side to the low-voltage side via coupling between the receiving coil and the coupling coil on the auxiliary power supply side.

[0039] The topological structure of the second embodiment can also be as follows Figure 13 The wireless charging system adopts the SS topology, and the second rectifier adopts diode bridge rectification. When the two batteries are charged simultaneously and the high-voltage battery is switched to charge the low-voltage battery, the low-voltage side output voltage can be kept stable by adjusting the driving frequency of the first active rectifier.

[0040] In addition to the structure shown in the above topology, the active rectification of the auxiliary power system can also be used as follows Figure 14 The two structures are shown in Figure 2. Active rectification can also be composed of a diode passive rectifier bridge, and a DC / DC converter can be added, such as Figure 15 shown.

[0041] The proposed integrated wireless charging system and auxiliary power supply system for electric vehicles utilizes shared components to reduce vehicle volume and increase power density. During wireless charging, both high-voltage and low-voltage batteries can be charged simultaneously. When the electric vehicle is not wirelessly charging or is driving, the high-voltage battery charges the low-voltage battery through the APM system, demonstrating its high practicality and broad application prospects.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other manner. Any person skilled in the art may utilize the above-disclosed technical content to modify or modify the present invention into equivalent embodiments. However, any simple modifications, equivalent variations, and modifications to the above embodiments that do not depart from the technical content of the present invention and are based on the technical essence of the present invention remain within the scope of protection of the present invention.

Claims

1. An integrated system of an electric vehicle wireless charging system and an auxiliary power supply system, characterized in that: The system comprises a ground-side system and a vehicle-side system. The ground-side system comprises a rectifier, a high-frequency inverter, a ground-side compensation network, and a transmitting coil. The vehicle-side system comprises a receiving coil, a vehicle-side compensation network, a first active rectifier, a high-voltage battery, a transformer, a second active rectifier, and a low-voltage battery. The rectifier is connected to the power grid, and the rectifier is connected to the transmitting coil via the high-frequency inverter and the ground-side compensation network. The transmitting coil and the receiving coil are coupled via a magnetic field to transfer energy. The receiving coil is connected to the vehicle-side compensation network, and the vehicle-side compensation network is simultaneously connected to the first active rectifier and the transformer. The first active rectifier is connected to the high-voltage battery, and the transformer is connected to the low-voltage battery via the second active rectifier. When the electric vehicle is wirelessly charged, electric energy is input from the power grid to charge the high-voltage battery and the low-voltage battery at the same time. The first active rectifier and the vehicle-side compensation network serve as part of the high-voltage battery charging circuit. When the electric vehicle is not wirelessly charged, electric energy is transmitted from the high-voltage battery to the low-voltage battery through the first active rectifier, the vehicle-side compensation network, the transformer, and the second active rectifier in sequence to charge the low-voltage battery. The first active rectifier and the vehicle-side compensation network serve as part of the high-voltage battery charging circuit for the low-voltage battery.

2. The integrated system of the electric vehicle wireless charging system and the auxiliary power system according to claim 1, characterized in that: The compensation inductor in the vehicle-side compensation network serves as the primary-side inductor of the transformer.

3. The integrated system of the electric vehicle wireless charging system and the auxiliary power supply system according to claim 1, characterized in that: The rectifier of the ground-side system adopts a three-phase rectifier, and the high-frequency inverter adopts an active H-bridge; in the vehicle-side system, the receiving coil is connected to a relay, the wireless charging system adopts an LCC-LCC topology, the first active rectifier adopts a bridge-type full-controlled rectifier, the auxiliary power supply system adopts a CLLC structure, and the second active rectifier adopts a bridge-type half-controlled rectifier. The low-voltage side voltage is kept stable through phase shifting; when the electric vehicle is wirelessly charged, the relay is closed, the transmitting coil charges the high-voltage battery, and at the same time, the low-voltage battery is charged through the auxiliary power supply system; when the electric vehicle is not wirelessly charged, the relay is opened, and the high-voltage battery charges the low-voltage battery through the auxiliary power supply system.

4. An integrated system of an electric vehicle wireless charging system and an auxiliary power supply system, characterized in that: The system comprises a ground-side system and a vehicle-side system. The ground-side system comprises a rectifier, a high-frequency inverter, a ground-side compensation network, and a transmitting coil. The vehicle-side system comprises a receiving coil, a vehicle-side compensation network, a first active rectifier, a high-voltage battery, a coupling coil, a second active rectifier, and a low-voltage battery. The rectifier is connected to the power grid, and the rectifier is connected to the transmitting coil via the high-frequency inverter and the ground-side compensation network. The transmitting coil and the receiving coil are coupled via a magnetic field to transfer energy. The receiving coil is connected to the high-voltage battery via the vehicle-side compensation network and the first active rectifier. The coupling coil is directly coupled to the receiving coil, and the coupling coil is connected to the low-voltage battery via the second active rectifier. When an electric vehicle is wirelessly charged, electric energy is input from the power grid to charge both the high-voltage battery and the low-voltage battery. When the electric vehicle is not wirelessly charged, electric energy is transmitted from the high-voltage battery to the low-voltage battery in sequence through the first active rectifier, the vehicle-side compensation network, the receiving coil, the coupling coil, and the second active rectifier to charge the low-voltage battery.

5. The integrated system of the electric vehicle wireless charging system and the auxiliary power supply system according to claim 4, characterized in that: The rectifier of the ground-side system adopts a three-phase rectifier, and the high-frequency inverter adopts an active H-bridge; in the vehicle-side system, the first active rectifier adopts a bridge-type full-controlled rectifier, and the second active rectifier adopts a bridge-type half-controlled rectifier.

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