DE202022102206U1 - Arrangement for electric vehicle - Google Patents

Abstract

Arrangement for an electric vehicle, the arrangement comprising:
at least three power converter devices (10A, 10B, 10C, 10D), each comprising a DC connection comprising a positive pole (11) and a negative pole (12),
wherein the power converter devices (10A, 10B, 10C, 10D) are electrically connected to each other via the direct current connections (11, 12), characterized in that
the converter devices (10A, 10B, 10C, 10D) are electrically connected to one another via the direct current connections (11, 12) in such a way that the positive poles (11) of the direct current connections of the converter devices (10A, 10B, 10C, 10D) are connected to one another by a first ring connection and the negative poles (12) of the direct current connections of the converter devices (10A, 10B, 10C, 10D) are interconnected by a second ring connection.

Description

field of invention

The invention relates to an arrangement for an electric vehicle.

Background of the Invention

Power conversion devices are capable of converting electrical energy from one form to another. For example, direct current (DC) can be converted into alternating current (AC) by an inverter (DC/AC converter). Alternating current can in turn be converted into direct current by a rectifier (AC/DC converter). A direct current converter (DC/DC converter) is able to convert the voltage of the direct current.

It may be necessary or preferable to connect two or more power conversion devices in such a way that their DC links, such as DC input links (e.g., inverters or DC-to-DC converters) or DC output links (e.g., rectifiers or DC-to-DC converters), are interconnected. For example, it is possible to use power conversion devices connected in this way in connection with an electric vehicle, such as a hybrid electric vehicle or a pure electric vehicle. 1 12 shows an example of a main circuit of an electric vehicle, which circuit comprises a plurality of power converter devices 10 which are connected to one another via a direct current connection DC.

2 FIG. 12 shows an example of connecting power conversion devices 10 to each other by ganging. In the example of 2 the power converter devices 10 are connected together such that positive poles DC+ of the direct current connections of the power converter devices are connected in series by conductors, and likewise negative poles DC- of the direct current connections of the power converter devices are connected in series by conductors. A problem with this type of connection is that the conductors limit the electrical power that can be transmitted.

3 FIG. 1 shows an example of connecting power converter devices 10 to one another by the so-called star-point connection. In the example of 3 the power converter devices 10 are electrically connected to one another in such a way that positive poles DC+ of the direct current connection of the power converter devices are connected to one another, and their negative poles DC− are connected to one another via a special distribution module 20 . Correspondingly, the power converter devices 10 could be connected via a DC bus system (not shown) comprising a positive DC bus and a negative DC bus. A problem with such a method of connection is the potentially high cost of the distribution module or equivalent assembly.

Brief description of the invention

It is an object of the invention to develop an apparatus to solve or alleviate the above problems or at least to provide an alternative solution. The object of the invention is achieved by an arrangement characterized by what is disclosed in independent claim 1. Preferred embodiments of the invention are disclosed in the dependent claims.

The invention is based on the fact that in the arrangement, converter devices are electrically connected to one another via the DC connections in such a way that the positive poles of the DC connections of the converter devices are connected to one another via a first ring connection, and the negative poles of the DC connections of the converter devices are connected to one another via a second ring connection.

An advantage of the arrangement according to the invention is that it is possible to reduce the conductor-specific loading of the conductors between the converters and on the other hand to improve the DC supply.

character list

• 1 ein Beispiel für einen Hauptstromkreis eines Elektrofahrzeugs zeigt;
• 2 ein Beispiel für eine Stromrichtervorrichtungsanordnung zeigt;
• 3 ein Beispiel für eine Stromrichtervorrichtungsanordnung zeigt;
• 4 ein Beispiel für eine Stromrichtervorrichtungsanordnung gemäß einer Ausführungsform zeigt;
• 5 ein Beispiel für eine Stromrichtervorrichtungsanordnung gemäß einer Ausführungsform zeigt; und
• 6 ein Beispiel für eine Stromrichtervorrichtungsanordnung gemäß einer Ausführungsform zeigt.

The invention will now be described in more detail in connection with preferred embodiments and with reference to the accompanying drawings, in which:

• 1 Fig. 12 shows an example of a main circuit of an electric vehicle;
• 2 shows an example of a power converter device arrangement;
• 3 shows an example of a power converter device arrangement;
• 4 shows an example of a power converter device arrangement according to an embodiment;
• 5 shows an example of a power converter device arrangement according to an embodiment; and
• 6 12 shows an example of a power converter device arrangement according to an embodiment.

Detailed description of the invention

The invention can be applied in general in connection with different types of electric vehicles. The use of the invention is not limited to the context of any particular type of system or structure or, for example, any type of vehicle. The figures only show elements that are relevant for understanding the invention. It should be noted that, for example, the number of different elements can vary and they can differ from the examples shown in the figures.

According to one embodiment, an arrangement for an electric vehicle comprises at least three power converter devices, each of which comprises a DC connection comprising a positive pole and a negative pole, the power converter devices being electrically connected to one another via these DC connections. In the arrangement, the converter devices are electrically interconnected via the DC links such that the positive terminals of the DC links of the converter devices are interconnected by a first ring connection and the negative terminals of the DC links of the converter devices are interconnected by a second ring connection. According to one embodiment, the first ring connection comprises a first closed ring forming a circuit to which the positive poles of the direct current connections of the converter devices are connected, and the second ring connection comprises a second closed ring forming a circuit to which the negative poles of the direct current connections of the Power converter devices are connected.

4 12 shows an example of a converter device arrangement according to an embodiment. The example of 4 comprises four power converter devices 10A, 10B, 10C, 10D, but the number of power converter devices can vary and can be, for example, three or five or more than five. The type of power converter devices 10A, 10B, 10C, 10D can vary and e.g. B. be a DC / DC converter, a frequency converter, a rectifier and / or an inverter. The type of power converter devices 10A, 10B, 10C, 10D can e.g. B. depend on the type and characteristics of the electric vehicle that uses the arrangement. Examples of possible types of power converter devices 10A, 10B, 10C, 10D are an inverter that is connected to the vehicle's electric motor, a DC/DC converter that is connected to an energy store such as a battery, a supercapacitor and/or a fuel cell of the connected to the vehicle, an inverter used to charge the vehicle and connectable to an external AC grid, and a generator rectifier connected to a fuel-powered generator, such as a diesel generator, of the vehicle. The electric vehicle (EV) that can use the arrangement or in which it can be applied can in turn be a hybrid electric vehicle (HEV) or a pure electric vehicle, for example. In addition, the electric vehicle can be designed for use in land, water and/or air transport. A land electric vehicle may be, for example, a trackless vehicle such as a car, or a rail vehicle.

In the example of 4 For example, each power converter device 10A, 10B, 10C, 10D comprises a direct current connection comprising a positive (DC+) 11 and a negative (DC-) 12 pole. In the example of 4 For example, the positive pole 11 of the DC connection of each power conversion device 10A, 10B, 10C, 10D comprises two connection terminals, and the negative pole 12 also comprises two connection terminals. The number of connection terminals in each pole 11, 12 can vary and can be 1, 2, 3 or more. Similarly, the nature of the connection terminals may vary and e.g. B. be a screw connection or a clamp connection or other suitable connection terminal type. The converter devices 10A, 10B, 10C, 10D are electrically connected to one another via the poles 11, 12 of the direct current connections in such a way that the positive poles 11 of the direct current connections of the converter devices 10A, 10B, 10C, 10D are connected to one another by a first ring connection, and the negative poles 12 the direct current connections of the converter devices are connected to one another by a second ring connection. In the example of 4 the first ring connection is formed by connecting the positive pole 11 of the DC connection of the first converter device 10A via a conductor connection 111 to the positive pole 11 of the DC connection of the second converter device 10B, the positive pole 11 of the DC connection of the second converter device 10B via a conductor connection 112 to the positive pole 11 of the DC connection of the third converter device 10C, the positive pole 11 of the DC connection of the third converter device 10C via a conductor connection 113 to the positive pole 11 of the DC connection of the fourth converter device 10D, and the positive pole 11 of the DC connection of the fourth converter device 10D via a conductor connection 114 to the positive pole 11 of the DC connection of the first power conversion device 10A. This forms the first ring connection to which the positive poles 11 of the DC connections of the converter devices are connected. In the example of 4 the second ring connection is further formed equivalently by connecting the Negative pole 12 of the DC connection of the first converter device 10A via a conductor connection 121 to the negative pole 12 of the DC connection of the second converter device 10B, the negative pole 12 of the DC connection of the second converter device 10B via a conductor connection 122 to the negative pole 12 of the DC connection of the third converter device 10C, the negative pole 12 the DC connection of the third converter device 10C via a conductor connection 123 to the negative pole 12 of the DC connection of the fourth converter device 10D, and the negative pole 12 of the DC connection of the fourth converter device 10D via a conductor connection 124 to the negative pole 12 of the DC connection of the first converter device 10A. This forms the second ring connection to which the negative poles 12 of the DC connections of the power converter devices are connected. In the example of 4 each of the conductor connections 111-114, 121-124 is connected to each power conversion device 10A, 10B, 10C, 10D at its own connection terminal. The conductor connections 111-114, 121-124 between the DC connections of the power converter devices 10A, 10B, 10C, 10D can be implemented by any suitable electrical conductors, such as wires, cables, busbars or combinations thereof. The conductor connections 111-114,121-124 can also have fuses or other protection devices, for example, which are simplified in the 4 are not shown for reasons of clarity.

In the example of 4 thus the conductor connections 111, 112, 113, 114 and the positive poles 11 of the direct current connections of the converter devices 10A, 10B, 10C, 10D, which connect them to each other, form the first circuit forming a closed ring. This means that the positive poles 11 of the DC connections of the power converter devices 10A, 10B, 10C, 10D are not only connected to the first circuit forming a closed ring, but at the same time they form part of this circuit. Likewise, the conductor connections 121, 122, 123, 124 and the negative poles 12 of the DC connections of the converter devices 10A, 10B, 10C, 10D, which connect them together, form the second circuit forming a closed ring. This means that the negative poles 12 of the DC connections of the converter devices 10A, 10B, 10C, 10D are not only connected to the second circuit forming a closed ring, but they also form part of this circuit. According to one embodiment, the positive poles 11 of the DC connections of the converter devices 10A, 10B, 10C, 10D are connected to the circuit forming the first closed ring in the same order as the negative poles 12 of the DC connections of the converter devices 10A, 10B, 10C, 10D are connected to the second closed ring-forming circuit are connected. The advantage of this embodiment is that the lengths of the conductor connections can be minimized. Alternatively, the positive poles 11 of the DC connections of the power converter devices 10A, 10B, 10C, 10D are connected in a different order to the circuit forming the first closed ring than the negative poles 12 of the DC connections of the electrical power converter devices 10A, 10B, 10C, 10D are connected to the second closed ring Ring-forming circuit are connected. Such a connection method can, for. B. may be required due to the physical properties or limitations of the device.

5 12 shows a second example of a power converter device arrangement according to an embodiment. The power converter arrangement of 5 otherwise corresponds to the converter arrangement of 4 , but in the example of 5 the conductor connections 111-114 which ring-like connect the positive poles 11 of the DC connections of the power converter devices 10A, 10B, 10C, 10D, and likewise the conductor connections 121-124 which connect the negative poles 12 in a ring-like manner, in each power converter device 10A, 10B, 10C, 10D connected in such a way that at least two conductor connections are always connected to the connection terminal of the pole 11, 12 of the DC connection. Thus, in the example of 5 the first loop-forming circuit of the conductor connections 111, 112, 113, 114 and the positive poles 11 of the DC connections of the converter devices 10A, 10B, 10C, 10D are connected to this first loop-forming electrical circuit. Likewise, in the example of 5 the second closed ring circuit of the conductor connections 121, 122, 123, 124 and the negative poles 12 of the DC connections of the converter devices 10A, 10B, 10C, 10D are connected to this second closed ring circuit.

6 12 shows a third example of a power converter device arrangement according to an embodiment. The power conversion device arrangement of FIG 6 otherwise corresponds to the converter arrangements of 4 and 5 , but in the example of the 6 the arrangement comprises separate closed ring-like circuits 110 and 120. The positive poles 11 of the DC connections of the converter devices 10A, 10B, 10C, 10D are connected to this first circuit 110, which forms a closed ring, by separate connection connections, and likewise the negative poles 12 of the DC connections of the Power converter devices 10A, 10B, 10C, 10D are connected to this second circuit 120 forming a closed ring by an equivalent separate terminal connection in a manner shown in the figure. The separate closed ring-like circuits 110 and 120 according to the example of FIG 6 can be formed, for example, from busbars or equivalent electrical conductors.

According to one embodiment, an electric vehicle comprises an arrangement in accordance with any embodiment described above or a combination of any embodiment described above. The electric vehicle may also include more than one of these arrangements, e.g. B. depending on the type of vehicle.

Those skilled in the art will find it obvious that the basic idea of the invention can be implemented in many different ways as technology advances. The invention and its embodiments are therefore not limited to the examples described above, but may vary within the scope of the claims.

Claims (7)

An arrangement for an electric vehicle, the arrangement comprising: at least three power converter devices (10A, 10B, 10C, 10D), each of which comprises a DC connection comprising a positive pole (11) and a negative pole (12), the power converter devices (10A, 10B, 10C, 10D) are electrically connected to one another via the direct current connections (11, 12), characterized in that the converter devices (10A, 10B, 10C, 10D) are electrically connected to one another via the direct current connections (11, 12) such that the positive poles (11) of the direct current connections of the converter devices (10A, 10B, 10C, 10D) are connected to one another by a first ring connection, and the negative poles (12) of the direct current connections of the converter devices (10A, 10B, 10C, 10D) are connected to one another by a second ring connection are. arrangement according to protection claim 1 , characterized in that the first ring connection comprises a first closed ring forming a circuit to which the positive poles (11) of the direct current connections of the converter devices (10A, 10B, 10C, 10D) are connected, and the second ring connection comprises a second closed ring which forms a circuit to which the negative poles (12) of the DC connections of the converter devices (10A, 10B, 10C, 10D) are connected. arrangement according to protection claim 2 , characterized in that the positive poles (11) of the DC connections of the electric converter devices (10A, 10B, 10C, 10D) are connected to the circuit forming the first closed ring in the same order as the negative poles (12) of the DC connections of the electric converter devices (10A, 10B, 10C, 10D) are connected to the circuit forming the second closed ring. Arrangement according to any of the Claims for protection 1 , 2 or 3 , characterized in that the converter device (10A, 10B, 10C, 10D) is a rectifier, an inverter, a DC-DC converter and/or a frequency converter. Arrangement according to any of the Claims for protection 1 - 4 , characterized in that the positive pole (11) of the direct current connection of each power conversion device (10A, 10B, 10C, 10D) comprises at least two connection terminals, and the negative pole (12) also comprises at least two connection terminals. Electric vehicle, characterized in that it has an arrangement according to any one of Claims for protection 1 - 5 includes. electric vehicle after protection claim 6 , characterized in that the electric vehicle is a hybrid electric vehicle or a pure electric vehicle.

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