High-frequency isolation type bidirectional AC-AC converter and PWM modulation method

An AC converter, high-frequency isolation technology, applied in the direction of converting AC power input to AC power output, conversion equipment that can be converted to DC without intermediate conversion, high-efficiency power electronic conversion, etc., can solve the problem of low work efficiency and power density. , hardware complexity and high cost, to achieve the effect of improving work efficiency and power density, circuit structure symmetry, and simplifying hardware structure

Pending Publication Date: 2022-08-05
XIAN UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the number of power switch tubes and passive components in multi-level converters is large, resulting in low working efficiency and power density, and relatively high hardware complexity and cost.

Method used

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  • High-frequency isolation type bidirectional AC-AC converter and PWM modulation method
  • High-frequency isolation type bidirectional AC-AC converter and PWM modulation method
  • High-frequency isolation type bidirectional AC-AC converter and PWM modulation method

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Embodiment Construction

[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] The present invention provides a high-frequency isolated bidirectional AC-AC converter, such as figure 1 As shown, it includes a first bridge arm, a second bridge arm and a DC filter capacitor C1 connected in parallel, a third bridge arm, a fourth bridge arm and a DC filter capacitor C2 connected in parallel, and also includes a cascaded first power frequency AC link, high frequency AC link and second power frequency AC link; the first end of the first power frequency AC link and the first end of the primary side of the high frequency AC link are both connected with the output end of the first bridge arm The second end of the first power frequency AC link and the second end of the primary side of the high frequency AC link are both connected to the output end of the second bridge arm; the first end of the second power frequency AC link i...

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PUM

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Abstract

The invention discloses a high-frequency isolation type bidirectional alternating current-alternating current converter which comprises a first bridge arm, a second bridge arm and a direct current filter capacitor C1 which are connected in parallel, a third bridge arm, a fourth bridge arm and a direct current filter capacitor C2 which are connected in parallel, and a first power frequency alternating current link, a high-frequency alternating current link and a second power frequency alternating current link which are cascaded in sequence, the first end of the first power frequency AC link and the first end of the primary side of the high-frequency AC link are both connected with the output end of the first bridge arm, and the second end of the first power frequency AC link and the second end of the primary side of the high-frequency AC link are both connected with the output end of the second bridge arm; the first end of the second power frequency AC link and the first end of the secondary side of the high-frequency AC link are both connected with the output end of the third bridge arm, and the second end of the second power frequency AC link and the second end of the secondary side of the high-frequency AC link are both connected with the output end of the fourth bridge arm. According to the converter, the working efficiency and the power density of equipment are improved. The invention further discloses a PWM modulation method of the converter.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to a high-frequency isolated bidirectional AC-AC converter, and also to a PWM modulation method for a high-frequency isolated bidirectional AC-AC converter. Background technique [0002] With the continuous development and popularization of smart grid technology, high-frequency isolated bidirectional AC-AC converters have great application value and potential in power electronic transformers, isolated AC-AC converters, etc. The high-frequency isolated bidirectional AC-AC converter has the advantages of high power density, light weight, and strong functionality, so its influence and research interest have gradually expanded. [0003] At present, the high-frequency isolated bidirectional AC-AC converter is mainly a three-stage circuit structure, and its specific structure is usually an AC-DC converter cascade isolated DC-DC converter, and then cascaded DC-AC converter. In t...

Claims

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Application Information

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IPC IPC(8): H02M5/293H02M5/18H02M1/088
CPCH02M5/293H02M5/18H02M1/088Y02B70/10
Inventor 孙向东王之轩黄伯雄任碧莹陈桂涛
Owner XIAN UNIV OF TECH
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