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Multiphase self-current sharing high gain DC converter and control strategy thereof

A technology of DC converter and control strategy, applied in the direction of converting DC power input to DC power output, control/regulation system, high-efficiency power electronic conversion, etc. The effect of improving efficiency

Inactive Publication Date: 2019-10-18
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the interleaved parallel bidirectional high-gain DC / DC converter adopts the traditional interleaved phase-shift control method, which will cause the current of each phase to achieve automatic current sharing within a limited duty cycle range as the number of phases increases. Greatly reduces the scope of application of this type of converter

Method used

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  • Multiphase self-current sharing high gain DC converter and control strategy thereof
  • Multiphase self-current sharing high gain DC converter and control strategy thereof
  • Multiphase self-current sharing high gain DC converter and control strategy thereof

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Embodiment Construction

[0030] see Figure 1 to Figure 2 , an embodiment of a multi-phase self-current sharing high-gain DC converter, in a four-phase self-sharing high-gain DC converter with four input phases, including an input power supply V g , four boost inductors L 1 , L 2 , L 3 , L 4 , four upper arm switches S S1 , S S2 , S S3 , S S4 , the four lower arm switch tubes S 1 , S 2 , S 3 , S 4 , and the load R o , filter capacitor C 4 , three switched capacitors C 1 、C 2 、C 3 , forming four input phases and three switched capacitor networks.

[0031] Among the four input phases, the input terminals of the four boost inductors are connected to the input power supply V g The positive connection of the four lower arm switching tubes and the source of the input power supply V g The negative connection of which,

[0032] The first inductance L of the first phase1 The output terminal of is connected to the first lower arm switch tube S 1 the drain of the second phase, the second indu...

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Abstract

The invention relates to a multiphase self-current sharing high gain DC converter and a control strategy thereof. The converter includes an input power, M boost inductors, M upper arm switch tubes, Mlower arm switch tubes, M-1 switch capacitor, a load and a filter capacitor which form M input phase numbers and M-1 switch capacitor networks. The control strategy adopted by the DC converter is thatthe upper arm switch tubes of the DC converter and the corresponding lower arm switch tubes are set to be complementarily opened; duty ratios D of the lower arm switch tubes are set to be not smallerthan 0.5 and smaller than 1 through driving signals, and duty ratios of all the lower arm switch tubes are the same; the adjacent lower arm switch tubes adopt the interleaving control strategy, phasedifference of the driving signals of any two adjacent phase lower arm switch tubes is in the range of [2pi(1-D), 2piD], wherein the D is the duty ratio. Through the control strategy, self-current sharing and high voltage gain can be automatically realized, self-current sharing can be automatically realized in the D range, the D is not smaller than 0.5 and smaller than 1 regardless a value of thephase number M, and the M is not smaller than 2.

Description

technical field [0001] The invention relates to the field of DC converters, in particular to a multi-phase self-equalizing high-gain DC converter used in photovoltaic new energy sources, fuel cells and electric drive systems of new energy vehicles and its control strategy. Background technique [0002] With the increasing consumption of traditional energy and the resulting environmental pollution, the utilization and development of new energy is imminent. As two important new energy sources, solar energy and hydrogen energy are mainly utilized in the form of photovoltaic power generation and fuel cell power generation. However, the DC output voltage generated by photovoltaics and fuel cells is low and difficult to be used directly. It often requires high-efficiency and high-gain DC / DC converters to increase the voltage to the required voltage level, especially in energy storage systems. A DC / DC converter with possible bi-directional flow of energy is required. Generally sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/38
CPCH02M1/38H02M3/1582H02M1/0054Y02B70/10
Inventor 章治国徐堂意向林朋廖鸣宇霍陆昱
Owner CHONGQING UNIV OF TECH
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