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A high-frequency isolated frequency conversion device based on pulse width splitting and its control method

A high-frequency isolation and frequency conversion device technology, which is applied in the direction of output power conversion device, control/regulation system, and electric variable adjustment, can solve the problem of large switching loss and voltage stress of the switching tube on the high-voltage side, and low system conversion efficiency and reliability. High, zero-crossing waveform distortion and other problems, to achieve the effect of high power density, convenient daily maintenance, voltage stress and switching loss

Inactive Publication Date: 2016-04-13
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the existence of two-stage high-frequency conversion in the existing high-frequency full-bridge isolation frequency conversion device, in which the high-voltage side switch tube switching loss and voltage stress are relatively large, and the system conversion efficiency and reliability are not high, while the traditional high-frequency chain type frequency conversion device The topology is complex, and the zero-crossing point of the pulsating DC voltage needs to be precisely phase-locked and commutated. There are problems such as large waveform distortion near the zero-crossing point, so as to provide a high-frequency isolated frequency conversion device with good comprehensive performance and easy implementation

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  • A high-frequency isolated frequency conversion device based on pulse width splitting and its control method
  • A high-frequency isolated frequency conversion device based on pulse width splitting and its control method
  • A high-frequency isolated frequency conversion device based on pulse width splitting and its control method

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Embodiment Construction

[0039] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0040] The main circuit topology of the high-voltage variable frequency power supply for well logging with a rated power of 15kVA in the embodiment of the present invention is as follows: figure 1 shown. The circuit includes a first full-bridge circuit (the first full-bridge circuit includes switching tubes T1~T4, and the switching frequency is 10kHz), a first full-bridge buffer capacitor C1, a DC blocking capacitor C2, and a high-frequency isolation transformer TM1 (magnetic Core operating frequency 10kHz), fast recovery rectifier bridge (the fast recovery rectifier bridge includes diodes D1~D4, the switching frequency is 10kHz), rectifier bridge buffer capacitor C3, pump brake resistor R1, pump brake switch T9, The second full-bridge circuit (the second full-bridge circuit includes switching tubes T5-T8, the switching frequency of which is ...

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Abstract

The invention relates to a high-frequency isolation frequency conversion device based on pulse width splitting and a control method thereof. The high-frequency isolation frequency conversion device of the invention comprises a digital signal processing unit, a drive circuit, a high-frequency modulation circuit, a high-frequency isolation transformer, a pulse rectifying circuit, a pulse commutation circuit and a low-pass filtering circuit. The high-frequency isolation frequency conversion device of the invention has the advantages of compact structure, high power density and electrical energy conversion efficiency, stable and reliable operation and easy realization of power unit modularization. Compared with the prior high-frequency full-bridge isolation frequency conversion circuit, high frequency conversion is completed only on the low-voltage side, the voltage stress and the switching loss of a switching tube are small, the conversion efficiency and reliability are high, and the device has high-voltage output capability.

Description

technical field [0001] The invention relates to the technical field of power electronics engineering, in particular to a high-frequency isolation type frequency conversion device based on pulse width splitting. Background technique [0002] In order to realize the high-voltage AC output with adjustable amplitude, the traditional method is to use an autovoltage regulator. However, the input and output terminals of the autovoltage regulator are connected to the common ground, which is not strictly electrically isolated, and the adjustment of the output frequency cannot be realized. In the process of voltage regulation, sparks are generated by mechanical brushes, which cannot meet the safety production requirements of oil drilling, natural gas extraction and other flammable and explosive occasions. In addition, high-power voltage regulators are generally bulky and have high power frequency noise, which causes a lot of inconvenience for field use. The rapid development of mode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M7/5387
Inventor 欧阳晖吴浩伟孙朝晖周樑李小谦姚川徐正喜陈涛魏华李鹏蔡凯姜波李可维邢贺鹏金惠峰罗伟耿攀谢炜吴大立李兴东余跃听雷津袁阳
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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