CN219643808U

CN219643808U - Multi-IGBT module parallel current equalizing circuit

Info

Publication number: CN219643808U
Application number: CN202320384162.4U
Authority: CN
Inventors: 徐卫香
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-03-04
Filing date: 2023-03-04
Publication date: 2023-09-05
Anticipated expiration: 2033-03-04

Abstract

The utility model discloses a multi-IGBT module parallel current equalizing circuit which comprises N pairs of IGBT modules which are connected in parallel, wherein N capacitors are N integers ranging from 1 to 30, and an inverter power supply, wherein the output end of each power module IGBT in the inverter power supply is connected with a load in series with the capacitors independently, and the output end of each power module IGBT is connected with the N capacitors. The utility model solves the problem that the current of each IGBT module is not uniform when a plurality of IGBT modules are connected in parallel, so that the equipment operation is more stable and reliable, the utilization rate of the IGBT module is greatly improved by 30% -50%, the use quantity of the IGBT modules is saved, the energy consumption is reduced, and the utility model has great economic benefit.

Description

Multi-IGBT module parallel current equalizing circuit

Technical Field

The utility model relates to the technical field of power electronics, in particular to a multi-IGBT module parallel current sharing circuit.

Background

In the existing high-power IGBT module inverter power supply, because the inverter power supply is limited by the rated current of the modules, a plurality of parallel connection is needed to meet the current demand, and the current imbalance of each module is caused by a plurality of parallel connection due to various reasons, so that the modules are damaged by overcurrent; the amplification margin has to be taken for the equipment to operate stably, and lowering the module usage rate leads to a cost increase.

In the prior art, the length, the area and the arrangement physical direction of the lead are adopted to improve current imbalance, so that the problem of unbalanced current generated by parallel connection of multiple modules is difficult to thoroughly solve, the modules are easy to overflow and damage, the use quantity of the modules can be greatly increased, the use ratio of the modules is reduced, and the use ratio of the current of the glow-emitting IGBT module cannot be fully increased.

Disclosure of Invention

Aiming at the technical defects, the utility model aims to provide a multi-IGBT module parallel current sharing circuit, which solves the problem that the current of each module is not equal in the parallel connection of a plurality of IGBT modules.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides a multi-IGBT module parallel current equalizing circuit which comprises N pairs of IGBT modules connected in parallel, N capacitors, N are integers of 1-30, N is an integer of 1-30, and an inverter power supply, wherein the capacitors are independently connected in series between the IGBT output end of each power module and a load in the inverter power supply, and the output ends of the IGBT modules are independently connected with the capacitors.

Preferably, the capacitance values of the capacitors are the same.

The utility model has the beneficial effects that: the circuit in the utility model uses the capacitor to flow uniformly, and the capacitors with the same capacitance value are connected in series in each IGBT module branch, so that the capacitance reactance of the capacitors is the same, and the alternating current flowing through the modules in each branch is forced to be uniform to the same value, thereby achieving the flow-equalizing effect, controlling the current difference value in each module within 2%, enabling the equipment to run more stably and reliably, greatly improving the utilization rate of the IGBT module by 30% -50%, thereby saving the use quantity of the IGBT module, reducing the energy consumption and having great economic benefit.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a parallel current sharing circuit of multiple IGBT modules according to an embodiment of the present utility model;

description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In embodiment 1, as shown in fig. 1, a multi-IGBT module parallel current equalizing circuit includes N pairs of parallel IGBT modules, N capacitors, N being an integer of 1-30, and an inverter power supply, wherein each power module IGBT output end in the inverter power supply is connected in series with a load independently, and each IGBT module output end is connected with a capacitor independently.

When the capacitor is used, the capacitor current sharing method is suitable for medium-high frequency induction power supplies and various IGBT module inverter power supplies, capacitors with the same capacitance value are connected in series in each IGBT module branch circuit, and the capacitance resistances of the capacitors with the same value are the same, so that the module alternating currents forced to flow through each branch circuit by the capacitance resistances of the capacitors are unified to the same value, the current sharing effect is achieved, and the current difference value in each module is controlled within 2%.

The utility model solves the problem that the current of each IGBT module is not uniform when a plurality of IGBT modules are connected in parallel, so that the equipment operation is more stable and reliable, the utilization rate of the IGBT module is greatly improved by 30% -50%, the use quantity of the IGBT modules is saved, the energy consumption is reduced, and the utility model has great economic benefit.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. The multi-IGBT module parallel current equalizing circuit is characterized by comprising N pairs of IGBT modules which are connected in parallel, wherein N capacitors and N are integers of 1-30, and an inverter power supply, wherein the capacitors are independently connected in series between the IGBT output end of each power module and a load in the inverter power supply, and the output end of each IGBT module is independently connected with the capacitors.

2. The multi-IGBT module parallel current sharing circuit according to claim 1, wherein the capacitance values of the capacitors are the same.