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A kind of igbt voltage equalizing circuit and frequency converter

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

Active Publication Date: 2022-04-01
SHENZHEN INVT ELECTRIC
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  • Abstract
  • Description
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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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  • A kind of igbt voltage equalizing circuit and frequency converter
  • A kind of igbt voltage equalizing circuit and frequency converter
  • A kind of igbt voltage equalizing circuit and frequency converter

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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 equalizing circuit and a frequency converter. The IGBT equalizing circuit includes a clamping circuit and a trailing voltage equalizing circuit; the clamping circuit is used for connecting with the IGBT; and the trailing voltage equalizing circuit is connected with the clamping circuit , and is used to connect with the IGBT; the clamping circuit includes k basic clamping units, each basic clamping unit corresponds to a clamping voltage; if the voltage across the basic clamping unit exceeds its corresponding clamping voltage, the basic clamping unit The unit is turned on to slow down the voltage change rate of the IGBT, where k is an integer, and k ≥ 1; the trailing voltage equalizing circuit corresponds to the trailing clamping voltage; in the current trailing stage after the IGBT is turned off, if the trailing The voltage across the tail voltage equalizing circuit exceeds the tail clamping voltage, and the tail voltage equalizing circuit is turned on to limit the rise of the IGBT voltage and clamp it below the set voltage. The technical solution of the present invention has the characteristics of strong expansibility and wide applicability, and can avoid the occurrence of voltage imbalance in the 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 Patents(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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