LLCT resonant bidirectional direct-current converter

A bidirectional DC conversion and converter technology, which is applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., which can solve the problems of narrow gain range and difficulty in raising the gain curve.

Active Publication Date: 2020-10-23
TIANJIN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But when the load increases, the gain curve is di

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  • LLCT resonant bidirectional direct-current converter
  • LLCT resonant bidirectional direct-current converter
  • LLCT resonant bidirectional direct-current converter

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[0018] The technical solutions of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0019] The present invention proposes an LLCT resonant bidirectional DC converter, which includes a full-bridge circuit on the inverter side, an LLCT resonant cavity and a full-bridge circuit on the rectification side, and these three parts are connected in sequence. When the converter works in the forward direction, the inverter-side full-bridge circuit adjusts the voltage gain by adjusting the switching frequency of the switch tube; when the converter works in the reverse direction, the rectifier-side full-bridge circuit also adjusts the voltage gain by adjusting the switching frequency of the switch tube Gain: the LLCT resonant cavity is introduced into the auxiliary transformer T2, and its own transformation ratio is used to increase the voltage gain, so as to ensure the zero-voltage turn-on of the switch tube and the zero-current tur...

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Abstract

The invention discloses an LLCT resonance type bidirectional direct-current converter. The topological structure of the converter comprises an inversion side full-bridge circuit, an LLCT resonance cavity and a rectification side full-bridge circuit which are connected in sequence. An auxiliary transformer T2 is introduced into the LLCT resonance cavity, the primary side of the T2 is connected in parallel between the point A and the point B in the resonant cavity inlet figure 2, the secondary side of the T2 is connected in series with the secondary side of the main transformer, and dotted terminals are in the same direction. Due to the introduction of the auxiliary transformer T2, the structure and the working frequency of the resonant cavity are changed. Compared with LLC, CLLC and other traditional resonant converters, the converter can realize high-gain buck-boost bidirectional work, has the soft switching characteristic of a switching tube, and ensures the high efficiency of the converter; high-voltage side parallel low-voltage side series connection of the auxiliary transformer is added, meanwhile, resonance inductance of a secondary side is removed, the gain range is widened,high-voltage side parallel low-voltage side series connection of the auxiliary transformer is added, resonance inductance of the secondary side is removed, and the gain range is widened.

Description

technical field [0001] The invention relates to a resonant bidirectional direct current converter, in particular to a high gain, wide range and high power bidirectional direct current converter. Background technique [0002] In order to solve the problems of energy depletion and environmental pollution, green new energy technologies have developed rapidly in recent years, and the development and effective utilization of distributed renewable energy has become a research hotspot in the current era. With the increase in the number of green buildings or household clean energy power generation systems, household energy storage devices will be commonly used, so bidirectional power converters suitable for distributed energy storage systems are required. [0003] In many applications, the capacity of the bidirectional power converter is about 1-5 kilowatts. At the same time, for safety and easy maintenance, the voltage of the household energy storage battery is mostly 24-48 volts, ...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33584H02M1/0058Y02E10/56
Inventor 侯宇琦王议锋张书槐陈博陈庆陈梦颖崔玉璐刘瑞欣吴啸尘王忠杰程鹏宇
Owner TIANJIN UNIV
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