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Energy obtaining circuit for series-connected IGBT dynamic voltage balancing control

A dynamic voltage equalization and circuit technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of increasing the cost of the control system, complexity and instability, etc., to improve maintenance-free, improve buffering effects, and improve system performance. efficiency effect

Inactive Publication Date: 2014-11-05
UNIV OF SHANGHAI FOR SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a dedicated power supply is used, due to the high voltage of the IGBT itself, the DC power supply will have a series of problems such as electrical isolation, position, and wiring, which will increase the cost, complexity, and instability of the control system.

Method used

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  • Energy obtaining circuit for series-connected IGBT dynamic voltage balancing control
  • Energy obtaining circuit for series-connected IGBT dynamic voltage balancing control
  • Energy obtaining circuit for series-connected IGBT dynamic voltage balancing control

Examples

Experimental program
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Embodiment Construction

[0018] Such as figure 1 The circuit diagram of energy harvesting from IGBT switching loss and efficient buffering is shown. This energy harvesting circuit includes the capacitance in the RCD snubber circuit connected in parallel with the IGBT and the static resistance in parallel with the IGBT. The static resistance energy harvesting circuit takes The energy end is connected in parallel to both ends of the static voltage equalizing resistor Rs2, and the output end of the static resistance energy acquisition circuit is output through the diode D2; The terminal is output through the diode D3, and the outputs of the two parts are collected together as the output of the entire energy-taking circuit.

[0019] Such as figure 2 In the energy-taking circuit diagram of the RCD snubber circuit shown, the capacitor C1, the auxiliary switching device Q, and the freewheeling diode D4 are connected in parallel to both ends of the capacitor C in the RCD snubber circuit of the IGBT, where t...

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Abstract

The invention relates to an energy obtaining circuit for series-connected IGBT dynamic voltage balancing control. The energy obtaining circuit comprises an RCD buffer circuit energy obtaining circuit and a static resistor energy obtaining circuit, wherein the RCD buffer circuit energy obtaining circuit obtains energy from a capacitor of an RCD buffer circuit connected with an IGBT in parallel, and the static resistor energy obtaining circuit obtains energy from a static resistor connected with the IGBT in parallel. The RCD buffer circuit energy obtaining circuit and the static resistor energy obtaining circuit respectively achieve collected output through an output diode. Switching losses of the IGBT are converted into electric energy necessary for control systems. According to the energy obtaining circuit, a stable direct current power supply is provided, the control circuit complexity degree and cost are reduced, system stability is improved, meanwhile, the impact of overvoltage and large current on a device is reduced, switching losses of the device are reduced, the buffer effect of the series-connected IGBT buffer circuit is improved, switching losses and temperature rise of the device are reduced, and system efficiency is improved.

Description

technical field [0001] The invention relates to an energy conversion technology, in particular to an energy-taking circuit for dynamic voltage equalization control of series IGBTs. Background technique [0002] In a large number of high-voltage devices using power electronic technology systems, a single IGBT cannot meet the requirements, and must be composed of multiple IGBTs in series. For example, the large-capacity flexible direct current transmission system, its voltage often reaches hundreds of kilovolts, and the converter valve is composed of high-power IGBTs in series, and the number of valve section devices connected in series is composed of IGBTs of different capacities in series according to the transmission voltage. Large-capacity inverters and dynamic reactive power compensation circuits often use IGBT series structures. [0003] However, when the IGBTs are connected in series, due to the different static parameters caused by the semiconductor process of the dev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088
Inventor 杨迪瑞杨文焕王朝立
Owner UNIV OF SHANGHAI FOR SCI & TECH
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