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Input-parallel and output-series Sepic-Cuk type combined direct-current converter

A technology of DC converter and output series connection, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., which can solve the problems of large structural changes and complicated control, and achieve the main circuit structure and control design. simple effect

Inactive Publication Date: 2017-01-04
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relevant scholars have proposed such combined DC converters as the Boost-Flyback DC converter with input stage sharing and output stage series connection and Boost-Sepic with coupled inductor sharing input stage and output stage series connection. The combined form of these converters has obtained a large voltage gain, but compared with the basic converter, the structure of these converters has changed greatly, and the control is more complicated. Its parameter design must be based on the small signal model of the new topology.

Method used

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  • Input-parallel and output-series Sepic-Cuk type combined direct-current converter
  • Input-parallel and output-series Sepic-Cuk type combined direct-current converter
  • Input-parallel and output-series Sepic-Cuk type combined direct-current converter

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Embodiment 1

[0021] Such as figure 1 As shown, a Sepic-Cuk type combined DC converter with input in parallel and output in series includes a lithium battery with a rated voltage of 50V, a basic Sepic converter 2, a basic Cuk converter 3, and a load 4. It is essentially It consists of a basic Sepic converter 2 and a basic Cuk converter 3 in parallel with input and output in series. The lithium battery 1 is shared, and the load 4 includes the third load R o , The first load R o1 , The second load R o2 .

[0022] The basic Sepic converter 2 consists of the first inductor L 1 , The second inductor L 2 , The first input filter capacitor C 11 , The first energy transfer capacitor C 1 , The first output filter capacitor C 21 , The first switch tube S 1 , The second switch tube S 2 Composition; the first inductor L 1 One end is connected to the anode of the lithium battery 1, and one end is connected to the first switch tube S 1 The drain is connected, the first switch tube S 1 The source of is connec...

Embodiment 2

[0027] Combine below Figure 2-4 Describe the specific working principle of this preferred embodiment: (The first switch tube S 1 And the second switch S 2 Working in complementary PWM drive mode, the third switch S 3 And the fourth switch tube S 4 It also works in complementary PWM drive mode, so as to realize the second switch S 2 And the fourth switch tube S 4 Synchronous rectification control. The first switch tube S 1 And the third switch tube S 3 Using interleaved control with a difference of 180º, the second switch tube S 2 And the fourth switch tube S 4 The interleaved control with a phase difference of 180º is also adopted, which effectively reduces the pulsating current on the input side of the converter, thereby reducing the volume of the filter capacitor on the input side. )

[0028] Such as figure 2 As shown, this is a block diagram of the control structure of the preferred embodiment, which is essentially two independent dual voltage and current loop control strateg...

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Abstract

The present invention relates to an input-parallel and output-series Sepic-Cuk type combined direct-current converter. The converter includes a lithium battery, a basic Sepic converter, a basic Cuk converter and loads. Essentially, the basic Sepic converter unit and the basic Cuk converter unit are combined in an input-parallel and output-series manner so as to form the combined direct-current converter of the invention. The lithium battery is shared. According to the combined converter of the invention, based on input-parallel and output-series, a voltage transformation ratio which is twice of the voltage transformation ratio of a traditional basic converter can be obtained; the maximum voltage stress of switch tubes and output filtering capacitors is decreased to half of that of a high voltage end; two output ports are fully decoupled, an output end has three voltage levels totally, so that the connection of the converter into loads with different voltage levels can be facilitated; an interleaving control technology is adopted, input current ripples can be effectively reduced, so that the capacity of input filtering capacitors can be decreased; and since the basic Sepic converter and the basic Cuk converter are adopted, a main circuit structure and a control design are relatively simple.

Description

Technical field [0001] The present invention relates to the field of power electronic application technology, power converter control technology and distributed new energy power generation application technology, in particular to a Sepic-Cuk type combined DC converter with input in parallel and output in series, which relates to photovoltaic cells and fuel cell power generation A DC power conversion device for an energy system and an energy storage system belongs to the field of DC / DC converters. Background technique [0002] Facing the serious situation such as the intensified energy crisis and global warming, governments, research institutes, and many universities and other research institutions are paying more and more attention to the important role of distributed energy power generation in ensuring energy security. From policy incentives, capital investment and demonstration From engineering to specific target formulation and project implementation, the development process o...

Claims

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Application Information

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IPC IPC(8): H02M3/158
CPCH02M3/1582
Inventor 杨柳柳任林涛雷志方汪飞
Owner SHANGHAI UNIV
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