CN205160378U - An electric vehicle and corresponding multi-unit IGBT module driving power supply - Google Patents

Abstract

The utility model discloses an electric automobile's polycell IGBT modular dirve power, include: a plurality of distributed transformers, each distributed transformer have a primary coil and a secondary winding, wherein, the input power is connected to the one end of the primary coil of each distributed transformer, the other end of the primary coil of each distributed transformer is through same switching device ground connection, a plurality of flyback secondary circuit, each flyback secondary circuit respectively with the secondary winding of each distributed transformer is connected, wherein, a IGBT drive circuit of polycell IGBT module is connected to each flyback secondary circuit opposite side. Correspondingly, the utility model also discloses a corresponding electric automobile. Implement the utility model discloses, can improve the whole power density of source transformation ware, earthquake resistance performance and heat dispersion.

Description

An electric vehicle and corresponding multi-unit IGBT module driving power supply

technical field

The utility model belongs to the field of electric vehicles, in particular to an electric vehicle and a corresponding multi-unit IGBT module drive power supply.

Background technique

Insulated Gate Bipolar Transistor (InsulatedGateBipolarTransistor, IGBT) is a composite fully-controlled voltage-driven power semiconductor device composed of a bipolar transistor (BJT) and an insulated gate field effect transistor (MOS). The advantages of both the input impedance and the low turn-on voltage drop of the GTR. Therefore, IGBT is very suitable for use in converter systems with a DC voltage of 600V and above, such as AC motors, frequency converters, switching power supplies, lighting circuits, traction drives and other fields.

The multi-unit IGBT module is a module that integrates multiple IGBT units. It has the characteristics of small size and high power density, so it is widely used in electric vehicles and other occasions that require high-power inverter power and are sensitive to volume. Each IGBT module of the multi-unit IGBT module needs a driving circuit, and in many cases, each driving circuit needs an independent isolated power supply. In general, these driving power sources will be integrated with the driving circuit on a printed circuit board (driver board), and the driver board will be directly fixed on the multi-unit IGBT module to form a complete component. Therefore, the size and structure of the driving power supply will directly affect the size and performance of the final component.

The traditional multi-unit IGBT module driving power solution uses a multi-output Flyback (flyback) transformer to generate the driving power required for each IGBT unit. Its multi-output function is achieved by winding multiple coils on the secondary side of the Flyback transformer. to realise. As shown in FIG. 1 , it shows a schematic structural diagram of an existing multi-cell IGBT module driving power supply.

However, this type of multi-output Flyback transformer has the following disadvantages:

First, because the volume of this type of multi-output Flyback transformer is usually much larger than other devices on the driver board, especially in the height direction, it is much higher than other devices, so that other components must keep a large distance from the driver board in the height direction, This will lead to a waste of internal layout space of the power converter, which limits the improvement of the overall power density of the power converter;

Second, due to the high quality of this type of multi-output Flyback transformer, and it is generally welded on the printed circuit board through pins during installation, its shock resistance is poor and it is easily damaged by vibration;

Third, the input voltage of the IGBT is as high as 300V or more, but the electrical isolation between the driving circuits is realized by the transformer. In order to ensure sufficient electrical spacing and creepage distance between the windings, the size of the transformer will be further increased. Or it is necessary to dig grooves in multiple parts of the PCB board, which will reduce the strength of the PCB board.

Utility model content

The technical problem to be solved by the utility model is to provide a multi-unit IGBT module drive power supply for electric vehicles, which uses a distributed Flyback transformer, which can make full use of the space and improve the overall power density, shock resistance and heat dissipation performance of the power converter .

In order to solve the above technical problems, the embodiment of the utility model provides a multi-unit IGBT module drive power supply for electric vehicles, including:

A plurality of distributed transformers, each distributed transformer has a primary coil and a secondary coil, wherein one end of the primary coil of each distributed transformer is connected to the input power supply, and the primary coil of each distributed transformer The other end of the side coil is grounded through the same switching device;

A plurality of Flyback secondary circuits, each Flyback secondary circuit is connected to the secondary coil of each distributed transformer respectively;

Wherein, the other side of each Flyback secondary circuit is connected to an IGBT drive circuit of the multi-unit IGBT module.

Among them, further include:

The Flyback control circuit is connected with the switch device.

Correspondingly, another aspect of the utility model also provides a multi-unit IGBT module drive power supply for electric vehicles, including:

A plurality of distributed transformers, each distributed transformer has a primary coil and two secondary coils, wherein, one end of the primary coil of each distributed transformer is connected to the input power supply, and each distributed transformer The other end of the primary coil is grounded through the same switching device, and a pair of opposite ends of the two secondary coils of each distributed transformer are connected and drawn out through the center tap;

A plurality of Flyback secondary circuits, each Flyback secondary circuit is connected to the other pair of opposite ends and the taps of the two secondary coils of each distributed transformer respectively;

Wherein, the other side of each Flyback secondary circuit is connected to an IGBT drive circuit of the multi-unit IGBT module.

Among them, further include:

The Flyback control circuit is connected with the switch device.

Correspondingly, the embodiment of the utility model also includes an electric vehicle, which adopts the above-mentioned multi-unit IGBT module to drive the power supply.

Implementing the utility model has the following beneficial effects:

Implementing the embodiment of the utility model, due to the use of multiple distributed transformers, the volume and quality of each transformer can be reduced, and because the volume of the transformer is reduced, especially its height can be greatly reduced, so the drive board edge can be reduced. The height direction and the distance between other devices can improve space utilization and increase the overall power density of the power converter;

Second, due to the reduced mass of a single distributed transformer, its anti-vibration performance is improved;

Furthermore, since the distributed transformer only needs to consider the insulation between a single primary and secondary transformer, it is easy to realize in design and manufacture;

In addition, since the core of each transformer becomes smaller, the thickness of the wire package is reduced, and the insulation layer is reduced (only the insulation layer is provided between the primary side and the secondary side), the heat dissipation conditions will be improved, so that its volume and quality can be further reduced .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

Fig. 1 is a structural schematic diagram of an existing multi-unit IGBT module driving power supply;

Fig. 2 is a structural schematic diagram of a first embodiment of a multi-unit IGBT module driving power supply provided by the utility model;

Fig. 3 shows the specific structure of an embodiment of the Flyback secondary circuit in Fig. 2;

Fig. 4 is a structural schematic diagram of another embodiment of a multi-unit IGBT module driving power supply provided by the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in FIG. 2 , it is a structural schematic diagram of an embodiment of a multi-unit IGBT module driving power supply provided by the present invention. In this embodiment, the drive power includes:

A plurality of distributed transformers, each distributed transformer has a primary coil and a secondary coil, wherein, one end of the primary coil of each distributed transformer is connected to the input power supply, and the other end of the primary coil of each distributed transformer is One end is grounded through the same switching device K;

A plurality of Flyback secondary circuits, each Flyback secondary circuit is respectively connected to the secondary coil of each distributed transformer;

Wherein, the other side of each Flyback secondary circuit is connected to an IGBT driving circuit of the multi-unit IGBT module, and each IGBT driving circuit is used to drive one IGBT module in the multi-single IGBT-free module.

Among them, further include:

The Flyback control circuit is connected with the switch device K and is used to control the switch device K to be turned on and off.

It can be understood that the Flyback control circuit, the Flyback secondary circuit and the IGBT drive circuit in FIG. 2 can be set according to actual applications. For example, various mature circuits in the prior art can be used, as shown in FIG. 3 . An embodiment of the Flyback secondary circuit is shown. It can be understood that other similar Flyback secondary circuits can also be used.

It can be understood that, in this embodiment, due to the use of distributed Flyback transformers, in the circuit, due to the reduced volume of the transformer, especially the reduced height, and several small transformers can be flexibly arranged in suitable places on the printed board. area, so that the space is effectively used; the mass of each transformer is reduced, and the anti-seismic ability is strengthened; each transformer only needs to ensure the electrical spacing and creepage distance of a single primary and secondary side, and the design and production are very easy to achieve; because the transformer The magnetic core becomes smaller, the wire wrap thickness of each transformer is reduced, and the insulation layer is reduced, so the heat dissipation condition of the transformer is improved.

As shown in FIG. 4 , it is a structural schematic diagram of another embodiment of a multi-unit IGBT module driving power supply provided by the present invention. In this embodiment, the drive power includes:

A plurality of distributed transformers, each distributed transformer has a primary coil and two secondary coils, wherein, one end of the primary coil of each distributed transformer is connected to the input power supply, and one end of the primary coil of each distributed transformer The other end is grounded through the same switch device K, and a pair of different-named ends (see the second and third ends in the figure) of the two secondary coils of each distributed transformer are connected and drawn out through the central pair;

A plurality of Flyback secondary circuits, each Flyback secondary circuit is connected to the other pair of opposite ends (see the first end and the fourth end in the figure) and the tap phase of the two secondary coils of each distributed transformer respectively. connect;

Wherein, the other side of each Flyback secondary circuit is connected to an IGBT driving circuit of the multi-unit IGBT module.

Among them, further include:

The Flyback control circuit is connected with the switch device K and is used to control the switch device K to be turned on and off.

Correspondingly, another aspect of the present utility model also provides an electric vehicle, which includes the multi-unit IGBT module drive power supply shown in Figure 2 to Figure 4, the specific details can refer to the foregoing description, it can be understood Yes, the electric vehicle mentioned here can include various types such as electric vehicle (Electric Vehicle, EV), plug-in hybrid electric vehicle (Plug-inhybrid electric vehicle, PHEV) and extended-range electric vehicle (Extended-Range Electric Vehicle, EREV).

Implementing the utility model has the following beneficial effects:

Implementing the embodiment of the present invention, since the single multi-winding transformer in the prior art is replaced by a plurality of distributed transformers, the volume and quality of each transformer can be reduced, because the transformer volume is reduced, especially its The height can be greatly reduced, so the distance between the driver board and other devices along the height direction can be reduced, thereby improving space utilization and increasing the overall power density of the power converter;

Second, due to the reduced mass of a single distributed transformer, its anti-vibration performance is improved;

Furthermore, since the distributed transformer only needs to consider the insulation between a single primary and secondary transformer, it is easy to realize in design and manufacture;

In addition, since the core of each transformer becomes smaller, the thickness of the wire package is reduced, and the insulation layer is reduced (only the insulation layer is provided between the primary side and the secondary side), the heat dissipation conditions will be improved, so that its volume and quality can be further reduced .

What is disclosed above is only a preferred embodiment of the utility model, and certainly cannot limit the scope of rights of the utility model with this. Therefore, the equivalent changes made according to the claims of the utility model are still covered by the utility model. scope.

Claims (5)

1. A multi-unit IGBT module drive power supply for electric vehicles, characterized in that it comprises: A plurality of distributed transformers, each distributed transformer has a primary coil and a secondary coil, wherein one end of the primary coil of each distributed transformer is connected to the input power supply, and the primary coil of each distributed transformer The other end of the side coil is grounded through the same switching device; A plurality of Flyback secondary circuits, each Flyback secondary circuit is connected to the secondary coil of each distributed transformer respectively; Wherein, the other side of each Flyback secondary circuit is connected to an IGBT drive circuit of the multi-unit IGBT module. 2. A kind of multi-unit IGBT module driving power supply for electric vehicle as claimed in claim 1, is characterized in that, further comprises: The Flyback control circuit is connected with the switch device. 3. A multi-unit IGBT module drive power supply for electric vehicles, characterized in that it comprises: A plurality of distributed transformers, each distributed transformer has a primary coil and two secondary coils, wherein, one end of the primary coil of each distributed transformer is connected to the input power supply, and each distributed transformer The other end of the primary coil is grounded through the same switching device, and a pair of opposite ends of the two secondary coils of each distributed transformer are connected and drawn out through the center tap; A plurality of Flyback secondary circuits, each Flyback secondary circuit is connected to the other pair of opposite ends and the taps of the two secondary coils of each distributed transformer respectively; Wherein, the other side of each Flyback secondary circuit is connected to an IGBT drive circuit of the multi-unit IGBT module. 4. a kind of multi-unit IGBT module drive power supply for electric vehicle as claimed in claim 3, is characterized in that, further comprises: The Flyback control circuit is connected with the switch device. 5. An electric vehicle, characterized in that it comprises the multi-unit IGBT module drive power supply according to any one of claims 1-4.