CN115987119A - An inverter circuit based on three-phase full-bridge intelligent power module - Google Patents

Abstract

The application discloses inverter circuit based on three-phase full-bridge intelligent power module. The intelligent power module comprises a three-phase full-bridge intelligent power module IPM, wherein a direct-current positive terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected with the positive electrode of a direct-current power supply, and a direct-current negative terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected with the negative electrode of the direct-current power supply; the A-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected with the wiring terminal L through an inductor L1, the B-phase bridge arm is electrically connected with the wiring terminal L through an inductor L2, and the C-phase bridge arm is electrically connected with the wiring terminal N; and the wiring terminal L and the wiring terminal N are used for outputting single-phase alternating current. The external discharging equipment of the electric automobile is completed by adopting the three-phase full-bridge intelligent power module, the direct current of the electric automobile is input, and the single-phase alternating current is output; compared with the method that single-phase alternating current is output through an H-bridge inverter topology, the reliability at the initial stage is high by adopting a three-phase full-bridge IPM; when single-phase alternating current is output, three bridge arms are utilized, and the capacity of any bridge arm is not wasted.

Description

An inverter circuit based on three-phase full-bridge intelligent power module

technical field

The present application relates to the technical field of power electronics, in particular to an inverter circuit based on a three-phase full-bridge intelligent power module.

Background technique

The external discharger of the electric vehicle, the core device inside is the inverter, the input of the inverter is the direct current of the electric vehicle, and the output of the inverter is single-phase alternating current or three-phase alternating current. Among them, more consumers use single-phase alternating current, and fewer industrial users use three-phase alternating current.

The KW-level IPM (Intelligent Power Module, including three-phase full-bridge inverter current, drive, and protection circuits) does not have a single-phase H-bridge. Most of the inverters currently on the market for outputting single-phase AC power use the H-bridge inverter topology with separate devices, and are independently driven to output single-phase power. Because there are fewer industrial users, there is basically no need to design additional three-phase AC circuits.

The inventor realized that this H-bridge inverter topology can only be a separate device, and IPM cannot be used, and the reliability is poor at the initial stage. Moreover, this H-bridge inverter topology can only output single-phase AC power. If it outputs three-phase AC power, the three-phase full-bridge circuit must be redesigned. However, when a three-phase full-bridge circuit is used to output a single phase, according to the conventional single-phase H-bridge application scheme, the capacity of one bridge arm will be wasted and the equipment cost will be increased.

Contents of the invention

For this reason, the present application provides an inverter circuit based on a three-phase full-bridge intelligent power module to solve the problem that the H-bridge inverter topology in the prior art cannot use IPM and has poor reliability at the beginning.

In order to achieve the above object, the application provides the following technical solutions:

In the first aspect, an inverter circuit based on a three-phase full-bridge intelligent power module includes a three-phase full-bridge intelligent power module IPM, and the DC positive terminal pin of the three-phase full-bridge intelligent power module IPM is connected to the DC power supply The positive pole is electrically connected, and the DC negative terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected to the negative pole of the DC power supply;

The A-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal L through the inductor L1, and the B-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal L through the inductor L2. Electrically connected, the C-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal N; the terminal L and the terminal N are used to output single-phase alternating current.

Optionally, the model of the three-phase full-bridge intelligent power module IPM is PSS35SA2FT.

Optionally, the inductance of the inductor L1 and the inductor L2 is 500uh.

Optionally, the switching frequency of the C-phase bridge arm is 50 Hz.

In the second aspect, an inverter circuit based on a three-phase full-bridge intelligent power module includes a three-phase full-bridge intelligent power module IPM, and the DC positive terminal pin of the three-phase full-bridge intelligent power module IPM is connected to the DC power supply. The positive pole is electrically connected, and the DC negative terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected to the negative pole of the DC power supply;

The A-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal A through the inductor L3, and the B-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal B through the inductor L4. The C-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal C through the inductor L5; the terminal A, terminal B and terminal C are used to output three-phase alternating current.

Optionally, the model of the three-phase full-bridge intelligent power module IPM is PSS35SA2FT.

Optionally, the inductance of the inductor L3, the inductor L4, and the inductor L5 is 500uh.

Optionally, the switching frequency of the C-phase bridge arm is 50 Hz.

Compared with the prior art, the present application has at least the following beneficial effects:

1. This application proposes a new hardware architecture of a single-phase inverter, including a three-phase full-bridge intelligent power module IPM, the DC positive terminal pin of the three-phase full-bridge intelligent power module IPM and the positive electrode of the DC power supply Connection, the DC negative terminal pin is electrically connected to the negative pole of the DC power supply; the A-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal L through the inductor L1, and the B-phase bridge arm is electrically connected to the terminal L through the inductor L2 L is electrically connected, and the C-phase bridge arm is electrically connected to the terminal N; the terminal L and the terminal N are used to output single-phase AC power; this application uses a three-phase full-bridge intelligent power module to complete the external discharge equipment of the electric vehicle, The input is the direct current of electric vehicles, and the output is single-phase alternating current; compared to outputting single-phase alternating current through the H-bridge inverter topology of separate devices, the three-phase full-bridge IPM is used, which has high reliability in the initial stage; at the same time, single-phase alternating current is output When , all three bridge arms are utilized, and the capacity of any one bridge arm is not wasted.

2. Based on the hardware architecture proposed in this application, when it is necessary to output three-phase AC power, there is no need to redesign the three-phase full-bridge circuit. On the basis of the structure of the single-phase inverter, simply adjust each bridge arm and wiring The terminal connection mode can realize the output of three-phase alternating current, which is convenient to use and can reduce equipment cost.

Description of drawings

In order to illustrate the prior art and the present application more intuitively, several exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the accompanying drawings should generally not be regarded as limiting conditions for the implementation of the present application; for example, those skilled in the art are able to The increase/decrease/attribution division, specific shape, positional relationship, connection mode, size ratio relationship, etc. of some units (parts) are easy to make conventional adjustments or further optimization.

FIG. 1 is a schematic structural diagram of a single-phase inverter circuit based on a three-phase full-bridge intelligent power module provided in Embodiment 1 of the present application;

FIG. 2 is a schematic structural diagram of a three-phase inverter circuit based on a three-phase full-bridge intelligent power module provided in Embodiment 2 of the present application.

Detailed ways

The present application will be further described in detail through specific embodiments below in conjunction with the accompanying drawings.

In the description of this application: unless otherwise specified, "plurality" means two or more. The terms "first", "second", and "third" in this application are intended to distinguish the referred objects, and have no special meaning in terms of technical connotation (for example, it should not be understood as a reference to the degree of importance or order, etc. emphasis). Expressions such as "comprising", "including", and "having" also mean "not limited to" (certain elements, components, materials, steps, etc.).

Terms such as "upper", "lower", "left", "right", "middle", etc. quoted in this application are usually for the convenience of intuitive understanding with reference to the drawings, rather than absolute terms for the positional relationship in the actual product limited. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

Embodiment one

In this embodiment, as shown in Figure 1, an inverter circuit based on a three-phase full-bridge intelligent power module is provided, including a three-phase full-bridge intelligent power module IPM, and a DC power supply of the three-phase full-bridge intelligent power module IPM The positive terminal pin is electrically connected to the positive pole of the DC power supply of the electric vehicle, and the DC negative terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected to the negative pole of the DC power supply of the electric vehicle;

The A-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal L through the inductor L1, and the B-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal L through the inductor L2. The C-phase bridge arm of the full-bridge intelligent power module IPM is electrically connected to the terminal N; the terminal L and the terminal N are used to output single-phase alternating current.

Preferably, a product model that can be used for the three-phase full-bridge intelligent power module IPM is PSS35SA2FT.

That is to say, when it is necessary to output single-phase AC power, the A-phase bridge arm is connected to one inductor, the B-phase bridge arm is connected to another inductor, and then shorted together, and then connected to terminal L; the C-phase bridge arm is directly connected to the inductor without the inductor. Connect terminal N, so that the three-phase full-bridge intelligent power module IPM can complete single-phase output.

Wherein, the C-phase bridge arm adopts a switching frequency of 50 Hz. Since the A-phase bridge arm and the B-phase bridge arm have both conduction loss and switching loss, while the C-phase bridge arm has only conduction loss (very low switching loss), so when the single-phase AC is output, the A-phase bridge arm and the The current sum of the B-phase bridge arm can also flow through the C-phase bridge arm together, and the capacity of the power electronic circuit of the three-phase bridge arm is not wasted, and all of them are fully utilized.

In addition, on the basis of the inverter provided in this embodiment, an inverter circuit capable of outputting three-phase AC power can be completed by simply changing the connection mode between each bridge arm and the terminal, without redesigning the three-phase phase full bridge circuit.

Specifically, as shown in Figure 2, the inverter circuit capable of outputting three-phase AC power includes a three-phase full-bridge intelligent power module IPM, the DC positive terminal pin of the three-phase full-bridge intelligent power module IPM and the DC power supply of the electric vehicle The positive pole of the three-phase full-bridge intelligent power module IPM is electrically connected to the negative pole of the DC power supply of the electric vehicle;

The A-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal A through the inductor L3, and the B-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal B through the inductor L4. The C-phase bridge arm of the full-bridge intelligent power module IPM is electrically connected to the terminal C through the inductor L5; the terminal A, the terminal B and the terminal C are used to output three-phase alternating current.

That is to say, when it is necessary to output three-phase AC power, connect the A-phase bridge arm, B-phase bridge arm, and C-phase bridge arm to inductors, and then connect them to terminal A, terminal B, and terminal C respectively. The three-phase AC output is simply completed through three terminals.

Preferably, the inductances of the inductor L1 , the inductor L2 , the inductor L3 , the inductor L4 and the inductor L5 are all 500 uh.

This application proposes a new hardware architecture of a single-phase inverter, which uses a three-phase full-bridge intelligent power module to complete the external discharge device of an electric vehicle. The input is the direct current of the electric vehicle, and the output is a single-phase alternating current. When outputting single-phase AC power, all three bridge arms are utilized without wasting the capacity of any bridge arm; compared to outputting single-phase AC power through separate devices, using a three-phase full-bridge IPM has high reliability at the initial stage.

Moreover, when it is necessary to output three-phase AC power, there is no need to redesign the three-phase full-bridge circuit. On the basis of the structure of the inverter, simply adjust the connection mode between each bridge arm and the terminal to realize the output of three-phase AC power, easy to use, and can reduce equipment costs.

Embodiment two

In this embodiment, as shown in Figure 2, an inverter circuit based on a three-phase full-bridge intelligent power module is provided, including a three-phase full-bridge intelligent power module IPM, and a DC power supply of the three-phase full-bridge intelligent power module IPM The positive terminal pin is electrically connected to the positive pole of the DC power supply of the electric vehicle, and the DC negative terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected to the negative pole of the DC power supply of the electric vehicle;

The A-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal A through the inductor L3, and the B-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal B through the inductor L4. The C-phase bridge arm of the full-bridge intelligent power module IPM is electrically connected to the terminal C through the inductor L5; the terminal A, the terminal B and the terminal C are used to output three-phase alternating current.

Preferably, a product model that can be used for the three-phase full-bridge intelligent power module IPM is PSS35SA2FT.

That is to say, when it is necessary to output three-phase AC power, connect the A-phase bridge arm, B-phase bridge arm, and C-phase bridge arm to inductors, and then connect them to terminal A, terminal B, and terminal C respectively. The three-phase AC output is simply completed through three terminals.

Wherein, the C-phase bridge arm adopts a switching frequency of 50 Hz.

In addition, on the basis of the inverter provided in this embodiment, an inverter circuit capable of outputting single-phase AC power can be completed by simply changing the connection mode between each bridge arm and the terminal without redesigning the single-phase inverter circuit. phase H-bridge circuit. Specifically, as shown in Figure 1, the inverter circuit capable of outputting single-phase AC power includes a three-phase full-bridge intelligent power module IPM, the DC positive terminal pin of the three-phase full-bridge intelligent power module IPM and the DC power supply of the electric vehicle The positive pole of the three-phase full-bridge intelligent power module IPM is electrically connected to the negative pole of the DC power supply of the electric vehicle;

The A-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal L through the inductor L1, and the B-phase bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected to the terminal L through the inductor L2. The C-phase bridge arm of the full-bridge intelligent power module IPM is electrically connected to the terminal N; the terminal L and the terminal N are used to output single-phase alternating current.

That is to say, when it is necessary to output single-phase AC power, the A-phase bridge arm is connected to one inductor, the B-phase bridge arm is connected to another inductor, and then shorted together, and then connected to terminal L; the C-phase bridge arm is directly connected to the inductor without the inductor. Connect terminal N, so that the three-phase full-bridge intelligent power module IPM can complete single-phase output.

Since the A-phase bridge arm and the B-phase bridge arm have both conduction loss and switching loss, while the C-phase bridge arm has only conduction loss (very low switching loss), so when the single-phase AC is output, the A-phase bridge arm and the The current sum of the B-phase bridge arm can also flow through the C-phase bridge arm together, and the capacity of the power electronic circuit of the three-phase bridge arm is not wasted, and all of them are fully utilized.

Preferably, the inductances of the inductor L1 , the inductor L2 , the inductor L3 , the inductor L4 and the inductor L5 are all 500 uh.

This application proposes a new hardware architecture of a three-phase inverter, which uses a three-phase full-bridge intelligent power module to complete the external discharge device of an electric vehicle. The input is the direct current of the electric vehicle, and the output is three-phase alternating current.

When it is necessary to output single-phase AC power, there is no need to redesign the single-phase H-bridge circuit, and the single-phase AC power can be output by simply changing the connection mode between each bridge arm and the terminal, which is convenient to use and can reduce equipment costs.

To sum up, the application can output both single-phase alternating current and three-phase alternating current, without separately designing single-phase H-bridge circuits and three-phase full-bridge circuits. Three-phase AC and single-phase AC can be output by simply changing the connection mode of each bridge arm and terminal. When outputting single-phase alternating current, all three bridge arms are utilized, and the capacity of any bridge arm is not wasted. Compared with outputting single-phase AC power through separate devices, using a three-phase full-bridge IPM has high reliability in the initial stage.

The technical features of the above embodiments can be combined arbitrarily (as long as there is no contradiction in the combination of these technical features), for the sake of concise description, all possible combinations of the various technical features in the above embodiments are not described; these are not clear All the written examples should also be regarded as within the scope of the description in this specification.

The present application has been described more specifically and in detail through general descriptions and specific examples above. It should be understood that based on the technical concept of the present application, some conventional adjustments or further innovations can also be made to these specific embodiments; Also fall within the protection scope of the claims of the present application.

Claims (8)

1. The inverter circuit based on the three-phase full-bridge intelligent power module is characterized by comprising a three-phase full-bridge intelligent power module IPM, wherein a direct-current positive terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected with a positive electrode of a direct-current power supply, and a direct-current negative terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected with a negative electrode of the direct-current power supply;

the phase A bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected with a wiring terminal L through an inductor L1, the phase B bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected with the wiring terminal L through an inductor L2, and the phase C bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected with a wiring terminal N; and the wiring terminal L and the wiring terminal N are used for outputting single-phase alternating current.

2. The inverter circuit of claim 1, wherein the three-phase full-bridge smart power module IPM is PSS35SA2FT.

3. The inverter circuit based on the three-phase full-bridge intelligent power module as claimed in claim 1, wherein the inductance of the inductors L1 and L2 is 500uh.

4. The three-phase full-bridge intelligent power module-based inverter circuit according to claim 1, wherein the switching frequency of the C-phase bridge arm is 50Hz.

5. The inverter circuit based on the three-phase full-bridge intelligent power module is characterized by comprising a three-phase full-bridge intelligent power module IPM, wherein a direct-current positive terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected with a positive electrode of a direct-current power supply, and a direct-current negative terminal pin of the three-phase full-bridge intelligent power module IPM is electrically connected with a negative electrode of the direct-current power supply;

the phase A bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected with a wiring terminal A through an inductor L3, the phase B bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected with a wiring terminal B through an inductor L4, and the phase C bridge arm of the three-phase full-bridge intelligent power module IPM is electrically connected with a wiring terminal C through an inductor L5; and the wiring terminal A, the wiring terminal B and the wiring terminal C are used for outputting three-phase alternating current.

6. The inverter circuit of claim 5, wherein the IPM is PSS35SA2FT.

7. The inverter circuit based on the three-phase full-bridge intelligent power module as claimed in claim 5, wherein the inductance of the inductor L3, the inductor L4 and the inductor L5 is 500uh.

8. The three-phase full-bridge intelligent power module-based inverter circuit according to claim 5, wherein the switching frequency of the C-phase bridge arm is 50Hz.

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