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Switch quasi-Z source-switched capacitor wide gain bidirectional DC converter for electric vehicle

A bidirectional DC conversion and electric vehicle technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc., can solve problems such as low voltage gain and electrical stress, and the power density of the converter cannot be improved. Wide range, improved energy conversion efficiency, and improved operational reliability

Inactive Publication Date: 2018-11-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the switched inductor DC converter can achieve a wider voltage gain and lower electrical stress while avoiding the limit duty cycle, but the power density of the converter cannot be improved by using more inductive components

Method used

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  • Switch quasi-Z source-switched capacitor wide gain bidirectional DC converter for electric vehicle
  • Switch quasi-Z source-switched capacitor wide gain bidirectional DC converter for electric vehicle
  • Switch quasi-Z source-switched capacitor wide gain bidirectional DC converter for electric vehicle

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Embodiment 1

[0035] A switch quasi-Z source-switch capacitor wide gain bidirectional DC converter, see Figure 1 to Figure 4 , the structure of the transformer is as follows:

[0036] (1) Topology

[0037] The topology of the switched quasi-Z source-switched capacitor bidirectional DC converter proposed by the embodiment of the present invention is as follows: figure 1 shown. From figure 1 It can be seen that the converter proposed by the embodiment of the present invention mainly includes two parts: a switched quasi-Z source network and a switched capacitor unit.

[0038] Among them, the switch quasi-Z source network includes: inductor L 1 , inductance L 2 , capacitance C 1 , capacitance C 2 , Power switch Q 2 . The switched capacitor unit includes: capacitor C 3 , capacitance C4 , capacitance C 5 , Power switch Q 3 , Power switch Q 4 and the power switch Q 5 .

[0039] where the power switch Q 2 , Q 3 and Q 5 The drive signal S 2 , S 3 and S 5 for the same drive sign...

Embodiment 2

[0071] Below to figure 1 The switching quasi-Z source-switching capacitor wide-gain bidirectional DC converter topology shown, figure 2 The main characteristic waveforms of the new topology in stable operation and figure 2 , 3 The topology equivalent circuit diagram of FIG. 1 illustrates the principles of the embodiments of the present invention. In each carrier cycle, the converter experiences two switching states in total, and the boost mode (Boost) and buck mode (Buck) of the converter will be described respectively below.

[0072] 1. Boost mode

[0073] When the switching quasi-Z source-switched capacitor bidirectional DC converter operates in boost mode, the characteristic waveform of the proposed converter in this state is as follows figure 2 As shown in (a), the corresponding topological current flow path is as follows image 3 (a) (b) shown.

[0074] (1) When S 1 S 2 S 3 S 4 S 5 =10010, the power switch Q 1 forward conduction, Q4 reverse conduction, the ...

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Abstract

The invention discloses a switch quasi-Z source-switched capacitor wide gain bidirectional DC converter for an electric vehicle. The bidirectional DC converter utilizes a switch quasi-Z source and a switched capacitor technology to perform buck-and-boost operations, and achieves a wide range; the bidirectional DC converter avoids the problem of extreme duty cycle operation of power switches causedby the increased gain while performing the buck-and-boost operations; and the voltage stress of all power switches is lower than the high-voltage side voltage. The boost ratio of the DC converter is(2+dBoost) / (1-dBoost), and the voltage stress of the power switches Q1-Q5 is 1 / (2+dBoost) of a conventional quasi-Z source DC converter and is 1 / 3 of the sum of the high-voltage side output voltage Uhigh and the low-voltage side input voltage Ulow. According to the scheme of the invention, a wide voltage gain can be realized, the voltage stress of the power switches can also be reduced, and meanwhile, a wider application scene of the converter can be achieved due to the characteristic of easy control.

Description

technical field [0001] The invention relates to the application occasion of a wide-gain bidirectional DC converter for an electric vehicle, in particular to a novel hybrid switch quasi-Z source-switched capacitor wide-gain bidirectional DC converter, which belongs to the technical field of power electronic power conversion. Background technique [0002] With the development of power electronic conversion technology, bidirectional DC converters have been widely used in microgrids, renewable energy systems, electric vehicles and other fields to ensure the power flow between different energy storage systems. In many applications, a bidirectional DC-DC converter between the energy storage device on the low-voltage side and the busbar on the high-voltage side requires a wide voltage gain. Therefore, the bidirectional DC converter between the energy storage device and the DC bus of different voltage levels has become an important research field, especially in the current fast-grow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1582
Inventor 张云刘强强张伟
Owner TIANJIN UNIV
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