A self-energy-capturing DC conversion circuit in the application mode of a pressure-connected igbt in series
A technology of DC conversion circuit and application mode, applied in the field of conversion circuit, can solve problems such as strong electromagnetic interference, and achieve the effect of small area of energy-receiving circuit, simple structure and good electromagnetic compatibility performance.
Active Publication Date: 2019-02-05
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +1
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Problems solved by technology
The dynamic range of source-drain voltage Vce of IGBT in SPWM mode is usually 0-2000V, which brings strong electromagnetic interference; the main technical difficulty in IGBT series application mode is the problem of voltage balance, whether it is from DC In the project where the busbar gradually rises from 0V to the rated DC operating voltage, whether the series IGBT valve body is working in static blocking or in the SPWM chopping mode, all IGBT source-drain voltages in the series IGBT valve body are required to be between Vce have certain balance requirements
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[0042] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0043] The present invention provides a self-energy-capturing DC conversion circuit in the series application mode of the pressure-connected IGBT, such as image 3 , the self-energy DC conversion circuit includes a first-stage voltage conversion module, a second-stage voltage conversion module and an analog resistive load module;
[0044] The input terminal of the first-stage voltage conversion module and the analog resistive load module are connected in parallel to both ends of the energy-taking capacitor Cs, and the input terminal of the second-stage voltage conversion module is connected in parallel to the output terminal of the first-stage voltage conversion module.
[0045] The first-stage voltage conversion module adopts a BUCK circuit with double closed-loop nonlinear control of voltage and current; the BUCK circuit includes a first input voltage detec...
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The invention provides a self-energy-supply direct-current conversion circuit in a press-packIGBT (Insulated Gate Bipolar Translator) serial application mode. The self-energy-supply direct-current conversion circuit comprises a first-stage voltage conversion module, a second-stage voltage conversion module and an analogue resistance load module; the input end of the first-stage voltage conversion module and the analogue resistance load module are connected at two ends of an energy-supply capacitor Cs in parallel; and the input end of the second-stage voltage conversion module is connected at the output end of the first-stage voltage conversion module in parallel. According to the self-energy-supply direct-current conversion circuit in the press-packIGBT serial application mode provided by the invention, electric energy can be directly obtained between an IGBT source and an IGBT drain in the press-pack IGBT serial application mode, so that high-potential self energy supply of an IGBT driving circuit is realized; and the influence of the self-energy-supply direct-current conversion circuit on IGBT serial static-state voltage equalization can be solved.
Description
technical field [0001] The invention relates to a conversion circuit, in particular to a self-energy-capturing direct-current conversion circuit in a series application mode of pressure-connected IGBTs. Background technique [0002] The topology of the pressure-connected IGBT series two-level main circuit has the characteristics of simple structure, small number of components used, simple control, and high reliability. Therefore, the crimp-type IGBT has become the core device in the fields of flexible DC power transmission, flexible AC power transmission, customized power and new energy grid connection in the future grid. The difficulty in the series application of pressure-connected IGBTs is the drive protection control technology, and the high-potential self-energy technology is a prerequisite for realizing drive protection control. Although there are foreign research institutions conducting research on IGBT series technology, there are few reports. Until now, only ABB h...
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IPC IPC(8): H02M3/155
Inventor 李卫国赵东元蔚泉清
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD