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High-efficiency and high-power density isolation DC-DC (Direct Current-Direct Current) conversion circuit based on GaN

A high power density, conversion circuit technology, applied in the direction of DC power input conversion to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., to improve the efficiency and power density of the converter, and improve the efficiency and power density Effect

Inactive Publication Date: 2017-05-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in the case of the same efficiency, the increase in power density means that more heat needs to be dissipated per unit volume

Method used

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  • High-efficiency and high-power density isolation DC-DC (Direct Current-Direct Current) conversion circuit based on GaN
  • High-efficiency and high-power density isolation DC-DC (Direct Current-Direct Current) conversion circuit based on GaN
  • High-efficiency and high-power density isolation DC-DC (Direct Current-Direct Current) conversion circuit based on GaN

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Embodiment Construction

[0034] The block diagram of the isolated DC-DC converter is as follows: figure 1 As shown, it consists of: GaNMOSFET half bridge, resonant inductor, resonant capacitor, transformer with turn ratio N:1:1, synchronous rectification GaNMOSFET, filter capacitor, Fly-back auxiliary power supply circuit, integrated LLC control UCC25600 chip circuit, driving UCC27714 circuit , Drive transformer, optocoupler and output feedback PI regulation circuit, PEM-2-S12-S5-D voltage conversion circuit, UCC24610 synchronous rectification control circuit. Among them, the high-voltage side device adopts GS66502B, and the low-voltage side device adopts GS61004B.

[0035] The primary side controller UCC25600 is a chip specially used for LLC resonant converter control produced by TI. The internal integrated oscillator supports switching frequency of 30-350kHz. The high-precision oscillator limits the difference of 4% in the minimum switching frequency, which can avoid the design beyond the power le...

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Abstract

The invention discloses a high-efficiency and high-power density isolation DC-DC (Direct Current-Direct Current) conversion circuit based on GaN. The high-efficiency and high-power density isolation DC-DC conversion circuit comprises an LLC (Liquid Level Control) half-bridge soft switch, a transformer with the turn ratio of N to 1 to 1, a filter capacitor, a Fly-back auxiliary power supply circuit, an integrated LLC control UCC25600 chip circuit, a driving UCC27714 circuit, an optical coupler and output feedback PI adjusting circuit, a PEM-2-S12-S5-D voltage conversion circuit and the like, wherein a primary edge adopts a GaN device GS66502B and a secondary edge adopts a GaN device GS61004B, and the primary edge and the secondary edge are arranged in parallel to carry out synchronous rectification; an LLC resonance circuit is combined with the synchronous rectification, and a simple design of a control and driving circuit and an auxiliary power supply is adopted and a wide-input voltage range is realized; constant output voltage is 12V and 200W DC-DC conversion is realized; the circuit adopts a GaN switching device so that the efficiency and power density of a converter are realized.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a high-efficiency, high-power-density isolated DC-DC conversion circuit based on GaN, in particular to an isolated DC-DC step-down circuit with wide-range input and constant output using GaN devices. Background technique [0002] DC-DC power supplies are widely used in military, industrial and daily life, but most of the current DC-DC converters are not particularly efficient, and the low efficiency is mainly caused by the unsatisfactory power electronic switching devices. Better devices will greatly benefit the efficiency of DC-DC converters, and are of great significance to energy conservation and environmental protection. DC-DC converters must be able to operate stably within the input voltage range and under different load conditions. Most applications require isolated DC-DC converters, so it is necessary to study isolated high-efficiency DC-DC converter solutions. ...

Claims

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Application Information

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IPC IPC(8): H02M3/338H02M3/335
CPCH02M3/33561H02M3/33592H02M3/3381Y02B70/10
Inventor 杨雁勇王正仕
Owner ZHEJIANG UNIV
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