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Inverter

A frequency converter and inverter technology, applied in the field of frequency converters, can solve problems such as increased cost and difficulty in rectification software control

Active Publication Date: 2015-11-25
盘锦华宇科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a frequency converter to solve the problems of increased cost and rectification software control difficulty caused by energy feedback in the prior art

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Embodiment Construction

[0021] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of the embodiments of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0022] figure 2 It is a schematic circuit diagram of a power unit provided by an embodiment of the present invention. Such as figure 2 As shown, the power unit includes:

[0023] The rectifying part 21, the energy storage capacitor 22 connected in parallel to the DC bus, and the H-bridge inverter 23 composed of four IGBTs Q1, Q2, Q3,...

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Abstract

The invention provides a power unit and a frequency converter. The power unit comprises a rectifying part, an energy storage capacitor connected with a direct current bus in parallel, and an H bridge inverter formed by four IGBTs (insulated gate bipolar translators); the rectifying part consists of two rectifying diodes and the other four IGBTs, the two rectifying diodes are connected with one phase output end of a secondary edge winding of a phase-shifting transformer, and the other four IGBTs are respectively connected with the other two phase output ends of the secondary edge winding; or the rectifying part consists of four rectifying diodes and the other two IGBTs, the other two IGBTs are connected with one phase output end of a secondary edge winding of a phase-shifting transformer, and the four rectifying diodes are respectively connected with the other two phase output ends of the secondary edge winding. According to embodiments of the invention, the rectifying software control difficulty can not be increased, and the IGBTs are under the work status of inversion by controlling the switching on / off of the IGBTs in the rectifying part, so that the electric energy generated by a motor can be fed back into a power grid.

Description

Technical field [0001] The embodiment of the present invention relates to power electronics technology, and in particular to a frequency converter. Background technique [0002] With the rapid development of power electronic technology, as a product of the development of power electronic technology in the 21st century, medium and high voltage inverters are widely used in many fields, especially the start of the localization process has brought many opportunities. Among them, the power unit series-type medium and high voltage inverter has become an important product in the field of medium and high voltage inverters. The inverter of this structure uses several independent variable frequency power units in series to achieve multi-level high voltage output and improve output voltage. Waveform. [0003] The structure of the widely used power unit series multi-level medium and high voltage inverter includes: an isolation phase-shifting transformer with multiple secondary windings, multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/45H02J3/38H02P27/06
CPCY02E40/10
Inventor 王荣亮
Owner 盘锦华宇科技实业有限公司
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