A non-isolated bidirectional DC converter for energy applications

A bidirectional DC conversion, non-isolation technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, instruments, etc., can solve the problem of high voltage conversion and simultaneous switching voltage, low switching voltage stress, high voltage, etc. problem, achieve low switching voltage stress, high voltage conversion ratio, and reduce loss

Active Publication Date: 2021-01-15
XI AN JIAOTONG UNIV
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Problems solved by technology

[0006] In view of the problems encountered by the above-mentioned bidirectional DC-DC converters, in order to overcome the shortcomings of high voltage conversion and low switching voltage at the same time, the purpose of the present invention is to provide a non-isolated bidirectional DC converter for energy applications, which can achieve high voltage gain and low switching voltage stress

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  • A non-isolated bidirectional DC converter for energy applications
  • A non-isolated bidirectional DC converter for energy applications
  • A non-isolated bidirectional DC converter for energy applications

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Embodiment Construction

[0024] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0025] see figure 1 As shown, a non-isolated bidirectional DC converter for energy applications in the present invention is mainly composed of five power switches S1-S5, four capacitors C1-C4, and two inductors L1-L2. In the boost model, where Two switches are used as power switches, while in the buck model, the remaining three switches are used as power switches. The present invention does not need a transformer and a coupled inductor, and theoretically can realize an infinite voltage transformation range. When the duty cycle is 0.5, the voltage variation range can reach 5 times, and the switch voltage tension is less than half of the maximum output voltage.

[0026] (1) It is suggested that in the boost state of the converter, power switch S3 and power switch S4 are used as power switches, while power switch S1, power switch S2 and power swit...

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Abstract

A non-isolated bidirectional DC converter for energy application is mainly composed of five power switches S1-S5, four capacitors C1-C4 and two inductors L1-L2; in a booster model, two switches are used as power switches; and in a buck model, the other three switches are used as power switches. According to the invention, a transformer and a coupling inductor are not needed, an infinite voltage transformation range can be realized theoretically, a five-time voltage change range can be reached when the duty ratio is 0.5, and the switching voltage tension is less than one half of the maximum output voltage.

Description

technical field [0001] The invention belongs to the technical field of new energy sources, is applied to photovoltaic grid-connected and DC micro-grids, and particularly relates to a non-isolated bidirectional DC converter for energy applications. Background technique [0002] Due to the pollution of the environment and the reduction of fossil fuels, new energy sources such as wind energy, photovoltaic solar energy are more and more widely used, and DC microgrid technology has also been greatly developed. As a result, DC bidirectional converters have received extensive attention and development. The bidirectional DC converter is mainly used in energy storage device, energy consumption device and DC bus or between DC bus and power supply for step-down and step-down. At present, the research on the bidirectional DC converter is mainly in two aspects: 1. Isolated type, 2. Non-isolated type. For isolated converters, the main types include full bridge, half bridge, and flyback ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/1582
Inventor 刘晔何沐函刘昊顾栋豪
Owner XI AN JIAOTONG UNIV
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