TWM573914U - Vehicle-end charging device of electric automobile and electric automobile - Google Patents

Abstract

The present invention provides an on-board charging device for an electric vehicle, including a power supply access circuit electrically connected to an external power source, a charge output circuit connected to a power battery, a transformer, and a power access circuit and a charge output circuit respectively connected to a primary side of the transformer and The secondary side is connected. A first rectifier circuit is disposed between the charging output circuit and the secondary side of the transformer, and further includes a wireless charging receiving circuit electrically connected to the charging output circuit and outputting power through the charging circuit. The new model also proposes an electric vehicle. The novel integrated design of the conductive vehicle-mounted charging circuit and the non-conductive vehicle-mounted wireless charging circuit reduces the cost, the volume, and the weight.

Description

On-board charging device of electric vehicle, electric vehicle

The present invention relates to the field of charging electric vehicles, and in particular, to a vehicle-side charging device for electric vehicles and electric vehicles.

There are two main types of electric vehicle charging methods: conductive charging (wired charging) and non-conductive charging (wireless charging). The corresponding converters are conductive vehicle charging converters and non-conductive wireless charging converters. Generally independent design. The conductive vehicle-mounted charging converter is placed on an electric vehicle to convert the AC grid energy into DC power to charge the power battery. The non-conductive wireless charging converter is divided into a wireless charging transmitting circuit that is conventionally installed on the ground and a wireless charging receiving circuit that is conventionally installed on the ground of an electric vehicle. During use, two parts are required to convert the AC grid energy into DC power batteries Charging.

In order to give full play to the advantages of wired charging and wireless charging, the existing solution is to install two sets of charging devices on electric vehicles and use them separately in different occasions and needs. Although the design of the two sets of devices brings functional advantages, However, at the same time, the cost of electric vehicles is greatly increased, the volume of electric vehicles is increased, and the weight of electric vehicles is increased.

In order to solve the above-mentioned problems in the prior art, that is, to solve the problems of high cost, large size and heavy weight of the coexistence design of the conductive vehicle-mounted charging circuit and the non-conductive vehicle-mounted wireless charging circuit.

In one aspect of the present invention, an on-vehicle charging device for an electric vehicle is provided, which includes a power access circuit electrically connected to an external power source, a charging output circuit connected to a power battery, a transformer, and a wireless charging receiving circuit. The power access circuit and the charging output circuit are electrically connected to the primary and secondary sides of the transformer, respectively. A first rectifying circuit is provided between the charging output circuit and the secondary side of the transformer, and the wireless charging receiving circuit is electrically connected to the charging output. Circuit and output power through it.

Preferably, the wireless charging receiving circuit includes a wireless charging coil and a second rectifying circuit;

The input terminal of the second rectifier circuit is electrically connected to the wireless charging coil, and the output terminal of the second rectifier circuit is connected in parallel with the output terminal of the first rectifier circuit.

Preferably, the power supply access circuit includes an input EMC circuit, a power factor correction circuit, and a first DC / DC conversion circuit that are electrically connected in sequence; an input end of the input EMC circuit is electrically connected to an external power source, and the first DC / DC conversion The circuit is electrically connected to the primary side of the transformer.

Preferably, the charging output circuit includes a second DC / DC conversion circuit and an output EMC circuit; the input end of the second DC / DC conversion circuit is electrically connected to the output end of the first rectification circuit, and the output end of the output EMC circuit is used for For output charging power.

Preferably, there are one or more wireless charging receiving circuits.

Preferably, it further comprises a cooling circuit for cooling the on-board charging device of the electric vehicle.

Preferably, the transformer is an isolation transformer.

Preferably, the first rectifier circuit and the second rectifier circuit are bridge rectifier circuits.

In another aspect of the present invention, an electric vehicle is also provided, including the on-board charging device of the electric vehicle as described above.

The novel integrated design of conductive vehicle-mounted charging circuit and non-conductive vehicle-mounted wireless charging circuit saves a set of DC / DC conversion circuit and output EMC circuit, which reduces cost, volume and weight.

The following describes preferred embodiments of the present invention with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

Currently, electric vehicle charging devices basically use conductive vehicle charging circuits, and use external power supply equipment for wired charging through power lines. The schematic diagram of the existing conductive vehicle charging circuit is shown in Figure 1, which mainly includes input EMC (Electro magnetic compatibility, Compatibility) circuit 11, power factor correction circuit 12, primary-side DC / DC conversion circuit 13, isolation transformer 14, secondary-side rectification circuit 15, secondary DC / DC conversion circuit 16, and output EMC circuit 17. The secondary rectifier circuit 15 may be a bridge rectifier circuit. As shown in FIG. 1, four switch diodes S1, S2, S3, and S4 and a capacitor C1 are used for design.

During charging, the input EMC circuit 11 is electrically connected to external power supply equipment, and after each circuit unit in the conductive vehicle charging circuit is transformed, the output EMC circuit 17 is used to charge the electric vehicle power battery.

With the rise of wireless charging technology, wireless charging technology is also applied to the field of electric vehicle charging. The wireless charging of electric vehicles is realized by two parts arranged separately: a wireless charging transmitting circuit conventionally arranged on the ground, and a wireless charging receiving circuit conventionally arranged on the electric vehicle site.

As shown in FIG. 2, the wireless charging transmitting circuit mainly includes an input EMC circuit 21, a power factor correction circuit 22, a DC / DC primary resonance circuit 23, and an isolation transformer primary 241.

As shown in FIG. 3, the wireless charging receiving circuit mainly includes an isolation transformer secondary side 242, a secondary side rectification line 25, a secondary DC / DC conversion circuit 26, and an output EMC circuit 27. The wireless charging receiving circuit is a non-conductive vehicle-mounted wireless charging circuit.

The secondary rectification line 25 in the wireless charging receiving circuit can be a bridge rectification circuit. As shown in FIG. 3, four switching diodes S5, S6, S7, S8, and a capacitor C2 are used for design.

Both the wireless charging technology and the wired charging technology of electric vehicles have their own advantages and disadvantages, and they can complement each other. The existing solution is to install two sets of charging devices on the electric vehicle and use them separately in different situations and needs. Although the design of the two sets of equipment brings functional advantages, it also greatly increases the cost of the electric vehicle, increases the volume of the electric vehicle, and increases the weight of the electric vehicle.

Based on the above problems, the novel design of the integrated vehicle charging circuit and the non-conductive vehicle-mounted wireless charging circuit is designed to the greatest extent, and an electric vehicle vehicle-side charging device is proposed to solve the above-mentioned problems brought by the design of two sets of devices. problem.

As shown in FIG. 4, an on-board charging device 3 for an electric vehicle according to an embodiment of the present invention includes a power access circuit 31 electrically connected to an external power source, a charging output circuit 33 electrically connected to a power battery, a transformer 32, and wireless charging reception. A circuit 34, a power access circuit 31 and a charging output circuit 33 are electrically connected to the primary and secondary sides of the transformer 32, respectively. A first rectifier circuit 35 is provided between the power access circuit 31 and the secondary side of the transformer 32 for wireless charging. The receiving circuit 34 is electrically connected to the power battery through the charging output circuit 33 and is used to charge the power battery.

With reference to FIG. 5, each part of the circuit of the novel embodiment is described in further detail.

The wireless charging receiving circuit 34 includes a wireless charging coil 341 and a second rectifying circuit 342. An input terminal of the second rectifying circuit 342 is electrically connected to the wireless charging coil 341, an output terminal of the second rectifying circuit 342 and an output terminal of the first rectifying circuit 35. in parallel.

The power access circuit 31 includes an input EMC circuit 311, a power factor correction circuit 312, and a first DC / DC conversion circuit 313 which are electrically connected in sequence. An input terminal of the input EMC circuit 311 is electrically connected to an external power source, and the first DC / DC conversion circuit 313 is electrically connected to the primary side of the transformer 32.

The charging output circuit 33 includes a second DC / DC conversion circuit 331 and an output EMC circuit 332. The input end of the second DC / DC conversion circuit 331 is electrically connected to the output end of the first rectifier circuit 35, and the output end of the EMC circuit 332 and power are output. The battery is electrically connected.

In the embodiment of the present invention, the first rectification circuit 35 is used for output rectification of the transformer 32, and the second rectification circuit 342 is used for output rectification of the wireless charging coil 341. The first rectification circuit 35 and the second rectification circuit 342 may use different rectifications. The circuit can also use the same rectifier circuit. In this embodiment, both use a bridge rectifier circuit.

As shown in FIG. 5, the first rectifying circuit 35 is composed of four switching diodes S1, S2, S3, S4, and a capacitor C1, and the second rectifying circuit 342 is composed of four switching diodes S5, S6, S7, S8 and the capacitor C1 in the first rectifier circuit 35 are configured. The first rectifier circuit 35 and the second rectifier circuit 342 are provided in parallel as a whole, and share the capacitor C1.

In the embodiment of the present invention, the number of wireless charging receiving circuits 34 may be one according to different settings, as shown in FIG. 6, or may be multiple, and the number of settings is determined according to the design requirements of the wireless receiving circuit.

In the new embodiment, a cooling circuit is also provided, which is used to cool the heat generated by the charging circuit of the vehicle-mounted end of the electric vehicle. It can be forced air cooling, natural cooling (mainly by heat sinks), and water cooling. , Air conditioning, etc.

Preferably, the transformer 32 may be an isolation transformer.

The wireless charging and wired charging of the embodiment of the present invention share the charging output circuit 33, and can perform wireless charging or wired charging independently, or simultaneously perform wireless charging and wired charging.

The new wireless charging and wired charging share a set of CAN communication circuits.

Based on the on-board charging device for an electric vehicle, the present invention also proposes an electric vehicle including the on-board charging device for an electric vehicle.

The novel integrated design of conductive vehicle-mounted charging circuit and non-conductive vehicle-mounted wireless charging circuit can save a set of DC / DC conversion circuit and output EMC circuit, and also save a set of CAN communication circuit. Cost, size and weight.

The terms "first", "second", and the like are used to distinguish similar items, and are not used to describe or indicate a particular order or sequence.

The term "comprising" or any other similar term is intended to encompass non-exclusive inclusion such that a process, method, article, or device / apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or Elements that are inherent to these processes, methods, articles, or equipment / apparatuses are also included.

So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the accompanying drawings. However, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific implementations. Without departing from the principle of the new model, those skilled in the art can make equivalent changes or replacements to related technical features, and the technical solutions after these changes or replacements will fall into the protection scope of the new model.

3‧‧‧ On-board charging device for electric vehicles

11‧‧‧input EMC circuit

12‧‧‧Power factor correction circuit

13‧‧‧Primary DC / DC converter circuit

14‧‧‧Isolation transformer

15‧‧‧ secondary rectifier circuit

16‧‧‧ secondary DC / DC converter circuit

17‧‧‧Output EMC circuit

21‧‧‧input EMC circuit

22‧‧‧Power Factor Correction Circuit

23‧‧‧DC / DC primary resonance circuit

25‧‧‧ secondary side rectifier line

26‧‧‧ secondary DC / DC converter circuit

27‧‧‧Output EMC circuit

31‧‧‧Power supply circuit

32‧‧‧Transformer

33‧‧‧Charge output circuit

34‧‧‧Wireless charging receiving circuit

35‧‧‧first rectifier circuit

241‧‧‧ primary side of isolation transformer

242‧‧‧ secondary side of isolation transformer

311‧‧‧input EMC circuit

312‧‧‧Power factor correction circuit

313‧‧‧First DC / DC converter circuit

331‧‧‧second DC / DC converter circuit

332‧‧‧Output EMC circuit

341‧‧‧Wireless charging coil

342‧‧‧Second rectifier circuit

[FIG. 1] is a schematic diagram of a conductive vehicle charging circuit; [FIG. 2] is a schematic diagram of a wireless charging transmitting circuit; [FIG. 3] is a schematic diagram of a wireless charging receiving circuit; [FIG. 4] is an embodiment of an electric vehicle vehicle-side charging device circuit Principle block diagram; [FIG. 5] is a schematic structural diagram of an electric vehicle vehicle-side charging device according to an embodiment; [FIG. 6] is a schematic circuit diagram of an electric vehicle vehicle-side charging device according to another embodiment.

Claims (10)

An on-board charging device for an electric vehicle includes a power supply access circuit electrically connected to an external power source, a charging output circuit electrically connected to a power battery, a transformer, and a wireless charging receiving circuit, wherein: the power supply access The circuit and the charging output circuit are respectively electrically connected to a primary side and a secondary side of the transformer; a first rectifying circuit is provided between the charging output circuit and the secondary side of the transformer; the wireless charging receiving circuit is electrically connected to the The charging output circuit outputs a power through the charging output circuit. The on-board charging device for an electric vehicle according to claim 1, wherein the wireless charging receiving circuit includes a wireless charging coil and a second rectifying circuit; an input terminal of the second rectifying circuit is electrically connected to the wireless charging coil, and An output terminal of the second rectifier circuit is connected in parallel with an output terminal of the first rectifier circuit. The on-board charging device for an electric vehicle according to claim 2, wherein the power supply access circuit includes an input EMC circuit, a power factor correction circuit, and a first DC / DC conversion circuit that are electrically connected in sequence; An input terminal is electrically connected to the external power source, and the first DC / DC conversion circuit is electrically connected to the primary side of the transformer. The on-board charging device for an electric vehicle according to claim 2, wherein the charging output circuit includes a second DC / DC conversion circuit and an output EMC circuit; an input terminal of the second DC / DC conversion circuit and the first The output terminal of the rectifier circuit is electrically connected, and an output terminal of the output EMC circuit is used to output a charging power. The on-board charging device for an electric vehicle according to any one of claims 1-4, wherein the wireless charging receiving circuit is one or more. The on-board charging device for an electric vehicle according to claim 5, further comprising a cooling circuit for cooling the on-board charging device for the electric vehicle. The on-board charging device for an electric vehicle according to any one of claims 1-4, wherein the transformer is an isolation transformer. The on-board charging device for an electric vehicle according to any one of claims 2-4, wherein the first rectifying circuit and the second rectifying circuit are a bridge rectifying circuit. The on-board charging device for an electric vehicle according to claim 1, wherein the first rectifier circuit is a bridge rectifier circuit. An electric vehicle includes the on-board charging device for an electric vehicle according to any one of claims 1-9.