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A control method suitable for h-bridge hybrid cascaded inverters with a voltage ratio of 1:2

A hybrid cascading and control method technology is applied in electrical components, output power conversion devices, and AC power input is converted into DC power output, etc. It can solve the problems of reduced life, high operating junction temperature, and reduced system reliability. Achieve the effect of improving lifespan, uniform heating, and enhancing reliability

Active Publication Date: 2016-08-24
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Effectively solves the problem of reduced system reliability due to high operating junction temperature and reduced service life of high-frequency switching tubes in the prior art

Method used

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  • A control method suitable for h-bridge hybrid cascaded inverters with a voltage ratio of 1:2
  • A control method suitable for h-bridge hybrid cascaded inverters with a voltage ratio of 1:2
  • A control method suitable for h-bridge hybrid cascaded inverters with a voltage ratio of 1:2

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Embodiment Construction

[0026] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0027] Such as figure 1 As shown, the main circuit topology of the H-bridge hybrid cascaded inverter with a voltage ratio of 1:2 includes the low-voltage unit DC power supply E, the high-voltage unit DC power supply 2E, and the H-bridge hybrid cascaded inverter; among them, the H-bridge hybrid The cascaded inverter includes first to eighth switching tubes, which are divided into a high-voltage unit and a low-voltage unit, and each of the first to eighth switching tubes includes an input end, an output end, and a control end.

[0028] The high voltage unit consists of the first switching tube S 11 , the second switch tube S 12 , the third switch tube S 13 , the fourth switch tube S 14 Composition; the first switch tube S 11 The input terminal of the high voltage unit is connected to the positive pole of the DC power supply 2E, and the first switchin...

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Abstract

The invention discloses a control method suitable for H-bridge hybrid cascaded inverters with a voltage ratio of 1:2. The method first defines the original reference voltage modulation wave and the triangular carrier wave, and converts the original reference voltage modulation wave in each working cycle It is divided into five intervals, and the reference voltage modulation wave is adjusted in each interval to obtain the adjusted modulation wave; then the adjusted modulation wave and its inverted signal are respectively intersected with the triangular carrier to obtain the first The control signals of the first to eighth switching tubes: This method can make all the switching tubes of the high-voltage unit and the low-voltage unit work in the same state, so that the loss of the four switching tubes of each unit is the same, and the heat is even, which is conducive to improving the life / reliability of the system , and also play a multiplier effect of the equivalent switching frequency of the output voltage of the bridge arm.

Description

technical field [0001] The invention belongs to the technical field of control in electric energy conversion devices, and in particular relates to a control method suitable for H-bridge hybrid cascaded inverters with a voltage ratio of 1:2. Background technique [0002] Medium frequency 400Hz inverters are widely used in transportation systems such as aviation and ships. With the improvement and development of system performance requirements, the capacity and performance requirements of the intermediate frequency power supply are also continuously improved, among which high efficiency, high power density and high reliability are the core index requirements. [0003] At present, most intermediate frequency inverters use the traditional full-bridge inverter circuit topology. In theory, the weight and size of the output filter can be reduced by increasing the switching frequency, but the increase in switching frequency will increase the switching loss. It is not conducive to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
Inventor 何凯益邓翔龚春英韦徵王赟程
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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