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High-gain boost converter with inverse square characteristic and its control method

A converter and high-gain technology, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., can solve problems such as voltage and current spikes, gain increase, and low output voltage. Achieve the effects of low voltage stress, increased gain, and reduced influence

Active Publication Date: 2020-09-29
STATE GRID SHANDONG ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These power systems have common shortcomings, that is, the output voltage is low, and it is difficult to output power frequency AC power after inversion, which requires a step-up DC converter to increase the voltage
Common boost technologies include coupled inductors, switched capacitors, etc. For converters that use coupled inductors to achieve voltage boosting, the output voltage generally increases with the increase in the turn ratio of the coupled inductor. At the same time, changes in the duty cycle cannot achieve a significant increase in gain
However, an excessively high turn ratio will bring some problems: parameters such as leakage inductance and parasitic capacitance will increase, which will easily cause voltage and current spikes, which seriously degrades the performance of the system

Method used

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  • High-gain boost converter with inverse square characteristic and its control method
  • High-gain boost converter with inverse square characteristic and its control method
  • High-gain boost converter with inverse square characteristic and its control method

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Embodiment 1

[0021] This embodiment discloses a high-gain boost converter with an inverse square characteristic, such as figure 1 shown, including the coupled inductor network, input filter inductor L in , the clamp boost circuit and the power switch tube S, the coupled inductor network includes the first winding N of the coupled inductor 2 , The second winding of the coupled inductor N 1 , the clamp boost circuit includes a first boost diode D 1 , the second boost diode D 2 , the third boost diode D 4 , the first clamping diode D c , output diode D o , the first boost capacitor C 1 , the second boost capacitor C 2 , the first clamp capacitor C c , output capacitance C o .

[0022] Input filter inductance L in , the second boost diode D 2 , the first clamping diode D c and the first clamp capacitor C c Connected in series to branch 1, the first boost capacitor C 1 , The first winding of the coupled inductor N 2 , the second boost capacitor C 2 and output diode D o Connect...

Embodiment 2

[0028] This embodiment discloses a control method for the high-gain boost converter described in Embodiment 1. This control method is to make the boost converter achieve figure 2 As shown in the modal diagram, figure 2 Indicates the high-gain boost converter control signal voltage V gs , The leakage inductance current of the first winding of the coupled inductor Coupled inductor second winding current i N1 , the first boost diode current Second boost diode current 3rd boost diode current First Clamp Diode Current output diode current Power switch tube current i s Waveform, this control method divides the working process of the boost converter into three switching modes, namely switching mode 1 to switching mode 3, and the specific description is as follows:

[0029] Switch mode 1, corresponding to figure 2 [t in 0 ,t 1 ], the equivalent circuit is shown in Fig. 3(a), t 0 Turn on the power switches S and D at all times 1 、D c 、D o reverse bias, D 2 、D ...

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Abstract

The invention discloses a high gain boost converter with an inverse square characteristic. The converter includes a coupling inductance network, an input filter inductor Lin, a clamping booster circuit, and a power switch tube S; an input side of the input filter inductor Lin is connected with an input power supply Vin, and an output side is connected with the clamping booster circuit; the input side of the coupling inductance network is connected with a boost capacitor C1 of the clamping booster circuit, and an output end is connected with a drain electrode of the power switch tube S and theclamping booster circuit; a grid electrode of the power switch tube S is connected with control signal voltage Vgs, and a source electrode of the power switch tube S is connected with a negative electrode of the input power supply Vin; and the output end of the clamping booster circuit is the output end of the boost converter, and a load is connected with the output end of the boost converter. A subtle change of the duty ratio of the converter can cause a large increase or decrease of gain, and the smaller the turn ratio of a coupled inductor, the higher voltage gain.

Description

technical field [0001] The invention relates to a high-gain boost converter with an inverse square characteristic and a control method thereof, belonging to the technical field of power electronic converters. Background technique [0002] In recent years, more and more attention has been paid to the DC micro-grid system that can satisfy local power supply. In particular, photovoltaic power generation, wind power generation and other systems in the field of renewable energy, as DC power sources, have become a research hotspot. These power systems have common disadvantages, that is, the output voltage is low, and it is difficult to output power-frequency AC power after inversion, which requires a step-up DC converter to increase the voltage. Common boost technologies include coupled inductors, switched capacitors, etc. For converters that use coupled inductors to achieve voltage boosting, the output voltage generally increases with the increase in the turn ratio of the coupled...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
Inventor 李飞季素云耿宁杨静刘林岳增伟崔川梁珊珊孙竟成姚雨张阳徐天赐于洋宋嵘高鹏薛启成朱锋王洪信刘兴华乔恒孙立新韩旭王世儒孙鹏王磊磊边宏超孙燕燕鹏李先进阎炳水李天邵泽霖葛鹏
Owner STATE GRID SHANDONG ELECTRIC POWER