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Current sharing method based on series-parallel Boost converter

A converter and parallel technology, applied in the direction of converting DC power input to DC power output, instruments, adjusting electrical variables, etc., can solve problems such as the inability to achieve current sharing, reduce total loss, improve stability, and expand the scope of application Effect

Active Publication Date: 2019-12-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the inability of series-parallel Boost converters to achieve current sharing in the case of inconsistent inductance, the present invention provides a current sharing control method without any additional auxiliary equipment to solve the problems in related technologies

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  • Current sharing method based on series-parallel Boost converter
  • Current sharing method based on series-parallel Boost converter
  • Current sharing method based on series-parallel Boost converter

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Embodiment Construction

[0026] The present invention will be further described in detail through specific examples and in conjunction with the accompanying drawings.

[0027] First analyze L 1 and L 2 When the sizes are inconsistent (for the convenience of analysis, suppose L 1 The inductance value is too large, the same below), the reason for the uneven flow of the inductor current. In the continuous mode of inductor current, it can be divided into three modes. Key waveforms such as image 3 shown.

[0028] (1) S 1 S 2 =11, such as figure 2 As shown in (A), S 1 and S 2 conduction, L 1 and L 2 Withstanding the forward voltage, the inductor current rises. According to the voltage-current relationship of the inductor, it can be seen that the rising slope of the current is proportional to the voltage and inversely proportional to the value of the inductor. Therefore, the slope of the inductor current rise is inconsistent;

[0029] (2)S 1 S 2 =00, such as figure 2 As shown in (C), S 1...

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Abstract

The invention discloses a current sharing method based on a series-parallel Boost converter, which belongs to the field of circuit electronics. The current sharing control method is based on the parameters of a circuit and the required voltage gain. By adjusting the on-off time of a switch tube, the inductor current is transformed accordingly, thereby achieving current sharing of a two-phase inductor. According to the control method, a current sensor or an additional device is not needed; on the basis of the original circuit, by increasing the duty cycle of the switch tube according to a certain rule, current sharing control within a certain duty cycle range is realized; the control method does not increase the complexity of the circuit structure; the realization of current sharing expandsthe stability and application range of the circuit; and the method is an effective low-cost solution.

Description

technical field [0001] The invention belongs to the field of circuit electronics, and relates to the application of DC-DC converter current equalization control technology, especially in the technical field of grid-connected converters for solar photovoltaic power generation. Background technique [0002] The development of human society is inseparable from the extensive use of energy. With the advancement of science and technology and the improvement of people's awareness of environmental protection, the demand for new non-polluting energy such as wind energy, tidal energy, and solar energy is increasing. Boost converters are widely used in new energy power generation systems such as photovoltaic power generation. Due to the advantages of small size, low cost and high efficiency, non-isolated high-gain Boost converters are getting more and more attention. The converter is also widely used in industrial fields such as new energy electric vehicles, communication power suppli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 陈章勇卢正东吴云峰赵玲玲沈澜枭
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA