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Single-input, double-output, three-switch group dc-dc converter and control method thereof

A single-input double-output, DC-DC technology, applied in the direction of DC power input conversion to DC power output, output power conversion device, control/regulation system, etc., can solve the problems of high cost, low fault tolerance rate, large loss, etc.

Active Publication Date: 2021-06-08
SOUTH CHINA UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When connecting multiple DC power grids, the first two methods not only require multiple converters, but also the voltage is converted in DC-AC and AC-DC stages, resulting in high cost and large losses; the third method requires multiple converters in series, Low fault tolerance rate, high cost

Method used

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  • Single-input, double-output, three-switch group dc-dc converter and control method thereof
  • Single-input, double-output, three-switch group dc-dc converter and control method thereof
  • Single-input, double-output, three-switch group dc-dc converter and control method thereof

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Embodiment Construction

[0019] In order to further illustrate the content and characteristics of the present invention, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto. It should be pointed out that, if there are any processes or symbols in the following that are not specifically described in detail, those skilled in the art can understand or implement them with reference to the prior art.

[0020] Take the first connection method as an example.

[0021] refer to figure 1 , the dual-output single-phase three-switch group DC-DC converter of this embodiment includes a DC input power supply U dc , switch arm, first DC load R 1 , the second DC load R 2 ; The switch bridge arm is composed of the first switch group A1, the coupling inductor L p :L s , the second switch group A2, and the third switch group A3 are connected in series; the first switch group A1 c...

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Abstract

The invention provides a single-input, double-output, three-switch group DC-DC converter and a control method thereof. The converter includes a DC input power supply, a first DC load, a second DC load, and a switch bridge arm; the switch bridge arm is composed of a first switch group, a second switch group, a third switch group, and a coupled inductor in series, each Each switch group is composed of N power switch units connected in series. The circuit of the present invention has three ports, constitutes three connection modes with one DC power supply and two DC loads, and can respectively realize the functions of step-up, step-down and step-down under different connection conditions. The invention adopts carrier phase-shifting PWM control to control the conduction and shutdown of the switch tube in the power switch unit to realize the regulation of the load voltage. The invention is suitable for high-voltage and high-power DC applications with single input and double output.

Description

technical field [0001] The invention relates to the field of distributed power generation systems and direct current transmission, in particular to a single-input, double-output, three-switch group DC-DC converter and a control method thereof. Background technique [0002] As an effective means to solve the problem of grid-connected new energy, flexible multi-terminal DC transmission and DC grid are developing rapidly. However, many DC grids currently operate at different voltage levels and need to be connected through converters. At present, the main methods used to connect different DC grids are: interconnecting DC grids in pairs through DC transformers, interconnecting multiple DC grids through multi-port DC-DC converters, and using multi-port DC-DC auto-coupling transformers to connect multiple DC grids. internet connection. When connecting multiple DC power grids, the first two methods not only require multiple converters, but also the voltage is converted in DC-AC an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158H02J1/10
CPCH02J1/102H02M3/158H02J1/082
Inventor 丘东元张波林满豪傅闯李立浧饶宏
Owner SOUTH CHINA UNIV OF TECH