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Full-duty-cycle current-sharing control method based on interleaved parallel Boost converter

A converter and duty cycle technology, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc. Achieve the effect of expanding circuit stability and application range, reducing circuit loss and improving efficiency

Active Publication Date: 2019-03-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0012] In order to overcome the shortcoming that the capacitor series interleaved parallel Boost converter cannot operate in equal current in the working range with a duty ratio less than 0.5, the present invention aims at the problem that the converter cannot operate in a current equalization range in the full duty ratio A current sharing control method without any additional auxiliary equipment is provided to solve the problems in related technologies

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  • Full-duty-cycle current-sharing control method based on interleaved parallel Boost converter
  • Full-duty-cycle current-sharing control method based on interleaved parallel Boost converter
  • Full-duty-cycle current-sharing control method based on interleaved parallel Boost converter

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Embodiment Construction

[0029] The present invention will be further described in detail through specific examples and in conjunction with the accompanying drawings. The present invention will be further described below in conjunction with the accompanying drawings.

[0030] Such as figure 1 , 2 , 3, 4, and 5, when the inductor current works in the continuous conduction mode, according to the switching states of the two switching tubes, the topology has four circuit states in total. The working modes are divided into 0.5≤D<1 and 0<D The case of <0.5.

[0031] When the converter works in the range of 0.5≤D<1, the circuit is divided into four stages:

[0032] (1) S 1 S 2 =11, such as figure 2 As shown in (D), the two-phase inductors are in the charging state, the two diodes are reversely cut off, there is no conduction loop at both ends of the intermediate capacitor, and the voltage remains unchanged;

[0033] (2)S 1 S 2 =01, such as figure 2 As shown in (C), the intermediate capacitor star...

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Abstract

The invention discloses a full-duty-cycle current-sharing control method based on an interleaved parallel Boost converter, thereby solving a non-current sharing problem of the capacitor series interleaved Boost converter in a full duty cycle range. According to the control method, charging time and discharge time of an intermediate storage capacitor are adjusted based on a capacitance charge balance principle and thus the inductor current is changed accordingly, so that two-phase inductor current sharing is realized. According to the method, no additional current sensor needs to be added and no additional control free amount needs to be added; and only the duty ratio of one certain phase of current needs to be changed based on the original circuit; current sharing of the converter in the full duty cycle range is realized without sampling feedback; and the double voltage characteristic of the conventional Boost converter is kept, so that the circuit control is simplified and the circuitstability and application range is extended. The method is a high-performance and low-cost solution.

Description

technical field [0001] The invention belongs to the field of circuit electronics, and relates to the application of current equalization control technology of interleaved parallel DC-DC converters, especially in the technical field of grid-connected converters for solar photovoltaic power generation. Background technique [0002] In order to meet the survival and sustainable development of human society in the future, it is urgent to develop and utilize new energy, and to change the center of gravity of the energy structure, so as to meet people's needs for energy use. Solar photovoltaic power generation is an important part of new energy and renewable energy, and it is also one of the most promising new energy technologies in the world. Due to the low energy density of solar energy, it is generally required that in photovoltaic power generation systems, the links of power electronic exchange should be reduced as much as possible, and the topology of the main circuit should ...

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0048Y02B70/10
Inventor 陈章勇赵玲玲吴云峰沈澜枭
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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