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IGBT series voltage-equalizing circuit and method

A series voltage equalization and circuit technology, applied in electrical components, output power conversion devices, etc., can solve the problems of IGBT series unbalanced voltage, difference, unbalanced voltage of series switch tubes, etc., to reduce switching loss and economy. Good results

Active Publication Date: 2015-07-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inconsistency of the IGBT's own parameters will lead to differences in the switching characteristics of each series-connected IGBT (such as turn-on and turn-off delays, the voltage change rate dV / dt during turn-on and turn-off), which will lead to voltage imbalances among the series-connected switch tubes.
In addition, the difference in the delay time of the driving signal will cause a higher dynamic voltage on the IGBT that is turned on later and turned off first, resulting in the problem of uneven voltage balance of the IGBT series
Therefore, the core problem of IGBT series application is the problem of voltage equalization

Method used

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  • IGBT series voltage-equalizing circuit and method
  • IGBT series voltage-equalizing circuit and method

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Embodiment Construction

[0026] The present invention is described in further detail below in conjunction with accompanying drawing:

[0027] refer to figure 1 , the IGBT series voltage equalizing circuit described in the present invention includes a global control circuit 1, N local control circuits 2, N IGBTs, and N diodes, the global control circuit 1 is connected to each local control circuit 2, and the ith local control circuit Circuit 2 is connected to the gate of the i-th IGBT, the emitter of the previous IGBT is connected to the collector of the next IGBT, and the anode and cathode of the i-th diode are respectively connected to the emitter and collector of the i-th IGBT Connection, 2≤N, and both i and N are natural numbers, 1≤i≤N.

[0028] It should be noted that the global control circuit 1 is connected to each local control circuit 2 through a high-speed optical fiber cable 3; each local control circuit 2 includes a drive circuit 5, a local controller 4, a controllable current source 6, an...

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Abstract

The invention discloses an IGBT series voltage-equalizing and a method. The IGBT series equalizing circuit comprises a global control circuit, N local control circuits, N IGBTs and N diodes, wherein the global control circuit is connected with all the local control circuits; the ith local control circuit is connected with the gate pole of the ith IGBT; the emitting electrode of the previous IGBT is connected with the collecting electrode of the next IGBT; the positive electrode and the negative electrode of the ith diode are respectively connected with the emitting electrode and the collecting electrode of the ith IGBT; N is larger than or equal to 2; both i and N are natural numbers; i is larger than or equal to 2 and smaller than or equal to N. According to the IGBT series voltage-equalizing circuit and the method, the IGBT series voltage equalization can be realized.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to an IGBT series voltage equalizing circuit and a method. Background technique [0002] Insulated Gate Bipolar Transistor (IGBT) combines the advantages of power field effect transistor (MOSFET) and power transistor, and has the advantages of high input impedance, low driving power, and good switching characteristics. It is an ideal fully controlled device. It has been widely used in power electronic equipment. However, for high-voltage and high-power power electronic equipment, the voltage level of a single IGBT cannot meet the requirements of the equipment, which makes it an effective choice to connect multiple IGBTs in series as a basic unit. [0003] The key to the application of IGBT in series is to ensure the voltage balance of each IGBT in the switching dynamic and steady state. The reasons for the uneven voltage balance of the IGBT series mainly include the incons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/092
CPCH02M1/092
Inventor 张帆杨旭任宇田莫帆
Owner XI AN JIAOTONG UNIV
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