Non-isolated Buck-Boost DC converter with wide conversion ratio

A DC converter and conversion ratio technology, which is applied in conversion devices and instruments that convert DC power input into DC power output and output power, can solve the problems of increasing the power loss of the switching tube, and achieve high boost voltage gain, high Conversion efficiency, effect of wide voltage gain

Inactive Publication Date: 2019-02-01
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the leakage inductance will increase the additional power loss of the switch tube, and an additional clamping circuit is required to compensate

Method used

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  • Non-isolated Buck-Boost DC converter with wide conversion ratio
  • Non-isolated Buck-Boost DC converter with wide conversion ratio
  • Non-isolated Buck-Boost DC converter with wide conversion ratio

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Embodiment Construction

[0021] Based on the traditional Buck-Boost DC converter, the present invention realizes the goal of low duty ratio and high voltage gain through the characteristics of parallel charging and series discharging of inductance and capacitor. Not only the topology is simple, but also the control method is easy to realize, which will be discussed in detail below.

[0022] The topology of the proposed non-isolated Buck-Boost DC converter is as follows figure 1 As shown, it is driven by the input DC power V in , inductance L 1 , L 2 and L 3 , boost capacitor C 1 、C 2 , the output filter capacitor C o , Diode D 1 、D 2 、D 3 and D 4 , power switch tube S 1 , S 2 and load R o composition. Input DC power V in The anode of the diode D 1 Positive electrode and inductance L 1 One end, the inductance L 1 The other end is connected to the boost capacitor C 1 Negative pole, diode D 1 The negative electrode is connected to the boost capacitor C 1 Positive, boost capacitor C ...

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Abstract

The invention relates to a non-isolated Buck-Boost DC converter with a wide conversion ratio, and the converter consists of an input DC power source Vin, inductors L1, L2 and L3, boost capacitors C1 and C2, an output filter capacitor Co, diodes D1, D2 D3 and D4, power switching tubes S1 and S2 and a load Ro. The goal of low duty ratio and high voltage gain is achieved by the parallel charging andseries discharging characteristics of the inductors and capacitors. The converter can obtain the high boost voltage gain without the extreme duty ratio, and the circuit uses only two power switching tubes. The proposed converter is simple in topology structure and control. An output voltage in a wider range is obtained through the new circuit topology, and the application range of the buck-boost converter is enlarged. The converter truly achieves the high boost voltage gain without the extreme duty ratio, and achieves the higher conversion efficiency and wider voltage gain.

Description

technical field [0001] The invention relates to a DC converter, in particular to a non-isolated Buck-Boost DC converter with a wide conversion ratio. Background technique [0002] As the focus on renewable energy has increased significantly in recent years, DC-DC converters have been widely used in electrical energy applications. With the rapid development of technology, Buck-Boost DC converters play an important role in the development and utilization of new energy sources, such as solar systems, fuel cells, wind power and photovoltaic power generation. Although the traditional Buck-Boost DC converter has a simple structure, it has not been widely promoted due to the limitation of conversion efficiency and relatively low voltage gain at medium duty cycles. Therefore, the Buck-Boost DC converter with wider conversion ratio and higher voltage gain has received more and more attention. As we all know, Buck-Boost DC converter and Cuk DC converter are two typical traditional r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1582
Inventor 屈克庆刘海风王悦赵晋斌高明
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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