Power unit and frequency converter

A technology of power unit and frequency converter, which is applied in the direction of converting AC power input to AC power output, output power conversion device, electrical components, etc., and can solve problems such as increased cost and difficulty in rectification software control

Active Publication Date: 2012-10-31
盘锦华宇科技实业有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a power unit and a frequency converter, which are used to so...

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Embodiment Construction

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

[0022] figure 2 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] A rectification part 21, an energy storage capacitor 22 connected in parallel on the DC bus, and an H-bridge inverter 23 composed of four IGBTs Q1, Q2, Q3, and Q4;

[002...

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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] Embodiments of the present invention relate to power electronics technology, and in particular to a power unit and a frequency converter. Background technique [0002] With the rapid development of power electronics technology, as a product of the development of power electronics 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 with this structure adopts the method of connecting several independent variable frequency power units in series to achieve multi-level high voltage output and improve the output voltage. waveform. [0003] The structure of the widely used power unit series multi-level medium and high voltage inverter includes: an isolation phase-shift...

Claims

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Application Information

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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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