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IGBT voltage-sharing circuit and frequency converter

A voltage equalizing circuit and clamping circuit technology, applied in the field of frequency converters, can solve the problems of poor scalability and single clamping voltage of the voltage equalizing circuit, and achieve the effects of wide applicability, avoiding voltage imbalance and strong scalability.

Active Publication Date: 2021-03-09
SHENZHEN INVT ELECTRIC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The embodiment of the present invention proposes an IGBT voltage equalizing circuit and a frequency converter, aiming to solve the problem of single clamping voltage and poor expandability of the existing voltage equalizing circuit

Method used

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  • IGBT voltage-sharing circuit and frequency converter
  • IGBT voltage-sharing circuit and frequency converter
  • IGBT voltage-sharing circuit and frequency converter

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Experimental program
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Effect test

Embodiment 3

[0066] The difference between Embodiment 3 and Embodiment 1 is that: the snubber capacitance Cp of each basic clamping unit 21 is connected to the gate of the IGBT 10 . It can be seen that in Embodiment 3, the clamping circuit 20 is connected between the collector and the gate of the IGBT 10 , and its voltage equalization mode is active voltage equalization.

[0067] see Figure 5 , in Embodiment 4 of the present invention, the IGBT voltage equalization circuit includes a rectifier diode Dp, a clamping circuit 20 and a trailing voltage equalization circuit 30 .

Embodiment 4

[0068] The difference between Embodiment 4 and Embodiment 2 is that: the snubber capacitor Cp of each basic clamp unit 21 is connected to the gate of the IGBT 10 . It can be seen that in Embodiment 4, the clamping circuit 20 is connected between the collector and the gate of the IGBT 10 , and its voltage equalization mode is active voltage equalization.

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Abstract

The embodiment of the invention discloses an IGBT voltage-sharing circuit and a frequency converter. The IGBT voltage-sharing circuit comprises a clamping circuit and a trailing voltage-sharing circuit. The clamping circuit is used for being connected with an IGBT. The trailing voltage-sharing circuit is connected with the clamping circuit and is used for being connected with the IGBT; the clamping circuit comprises k basic clamping units, and each basic clamping unit corresponds to one clamping voltage; if the voltage at the two ends of each basic clamping unit exceeds the corresponding clamping voltage, the basic clamping units are switched on to slow down the voltage change rate of the IGBT, k is an integer, and k is larger than or equal to 1; the trailing voltage-sharing circuit corresponds to a trailing clamping voltage; and in the current trailing stage after the IGBT is turned off, if the voltage at the two ends of the trailing voltage-sharing circuit exceeds the trailing clamping voltage, the trailing voltage-sharing circuit is switched on to limit the voltage rise of the IGBT and clamp the IGBT to be below the set voltage. The technical scheme provided by the invention hasthe characteristics of strong expansibility and wide applicability, and can avoid voltage unbalance of the IGBT in a current trailing stage after the IGBT is turned off.

Description

technical field [0001] The invention relates to the technical field of frequency converters, in particular to an IGBT voltage equalizing circuit and a frequency converter. Background technique [0002] IGBT (Insulated Gate Bipolar Transistor, Insulated Gate Bipolar Transistor) is a commonly used power semiconductor device in the field of medium and high voltage transmission, as well as the execution unit of modulation and control algorithms. Its withstand voltage level greatly affects the power topology selection of the inverter , control algorithm complexity, overall machine cost volume and operating efficiency and other key indicators. In recent years, medium and high voltage inverters have developed rapidly towards the trend of energy saving, environmental protection, localization and high reliability. The application of IGBT series technology can effectively expand the voltage level of inverters, replace high-voltage IGBT devices with low domestic production rates, redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088H02M1/32
CPCH02M1/088H02M1/32
Inventor 周志达吴轩钦王国建耿程飞张旭
Owner SHENZHEN INVT ELECTRIC
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