Zero-backflow power soft switching modulation method of resonant dual-active bridge and converter

A technology of dual active bridges and modulation methods, applied in the direction of converting DC power input into DC power output, output power conversion devices, and adjusting electrical variables, etc., can solve the problems of low comprehensive power transmission efficiency, current and voltage oscillations, and damage to switching tubes And other issues

Active Publication Date: 2020-10-27
江苏汉尔源智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the operation of DC-AC conversion, the instantaneous power is constantly changing, and it will be in a low power state for a long time near the AC zero crossing point, so the comprehensive power transmission efficiency of fundamental wave modulation or single phase shift control is low
[0014] In addition, at the moment when the full bridge and the half bridge are turned off or at the moment when the full bridges on both sides are judged, there is a current flowing through the switching tube in the forward direction, which causes the switching process to be hard switching.
Hard switching will cause high switching loss, and may also cause current and voltage oscillations during the switching process, resulting in overvoltage or overcurrent damage to the switching tube.

Method used

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  • Zero-backflow power soft switching modulation method of resonant dual-active bridge and converter
  • Zero-backflow power soft switching modulation method of resonant dual-active bridge and converter
  • Zero-backflow power soft switching modulation method of resonant dual-active bridge and converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this embodiment, the above modulation method is applied to figure 1 In the shown DC-AC half-bridge power converter, the turn-on times of the four switches of the full bridge on the DC side have a certain time difference. Among them, the switch S of the DC side full bridge 1 and S 2 Simultaneously on and off, the switch S 3 and S 4 Simultaneously on and off, the switch S 1 and S 2 with switch S 3 and S 4 There is a certain time difference in the turn-on time of ; in the positive half cycle, the AC side switch S 5 and S 7 is in the off state, the switch S 6 and S 8 Simultaneously turn on and off, and with switch S 3 and S 4 The turn-on times are consistent and reversed during the negative half-cycle.

[0056] The control signal and voltage and current waveforms of the dual active bridge control method of this embodiment are as follows Figure 5 shown. The frequency of the control signal of the full bridge and the half bridge is the resonant frequency fr,...

Embodiment 2

[0068] In this embodiment, the above modulation method is applied to image 3 shown on the DC-AC full-bridge power converter. Among them, the switch S of the DC side full bridge 1 and S 2 Simultaneously on and off, the switch S 3 and S 4 Simultaneously on and off, the switch S 1 and S 2 with switch S 3 and S 4 There is a certain time difference in the turn-on time of ; in the positive half cycle, the AC side switch S 5 , S 7 , S 9 and S 11 is in the off state, the switch S 6 , S 8 , S 10 and S 12 Simultaneously turn on and off, and with switch S 3 and S 4 The turn-on times are consistent and reversed during the negative half-cycle.

[0069] The control signal and voltage and current waveforms of the dual active bridge control method of this embodiment are as follows Image 6 shown. When the power converter works on the full bridge topology, it needs to satisfy U 1 >U 2 . AC voltage U 2 There are positive and negative polarities, and there are different s...

Embodiment 3

[0077] This embodiment provides a conversion device in which multiple DC-AC half-bridge power converters or DC-AC full-bridge power converters are connected in parallel or in series, and adopts the modulation methods of embodiments 1 and 2 to achieve higher current or voltage.

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Abstract

The invention relates to a zero-backflow power soft switching modulation method of a resonant dual-active bridge. The resonant dual-active-bridge inverter comprises a direct-current side bridge structure, a resonant cavity and an alternating-current side bridge structure, in the method, the switching-on time of a plurality of switches of the direct-current side bridge structure has a set time difference, and in the alternating-current side bridge structure, one half of the switch is in a switching-off state and the other half of the switch is in a switching-on state in a positive half cycle and a negative half cycle respectively. Compared with the prior art, an intermittent current mode is utilized, backflow power is completely eliminated, and soft switching can be achieved on all switches. Therefore, the switching loss is reduced, the conduction loss is reduced, and the power transmission efficiency can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of power conversion, in particular to a zero-reflux power soft-switching modulation method of a resonant double active bridge and a converter. Background technique [0002] With the development of technologies such as new energy power generation, distributed power generation, and smart grid, there are more and more application scenarios for DC-AC power conversion. Currently, DC-AC power conversion equipment is the most commonly used. In order to improve power density and reduce switching loss and conduction loss, LC series resonance is introduced into dual active bridge power converters to form a resonant dual active bridge inverter. Since the polarity of the voltage on the AC side will change, the common DC-DC power converter will be short-circuited in reverse and cannot be directly applied to the AC system. For power converters specially designed for DC-AC conversion, since the instantaneous power on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33576H02M1/0058Y02B70/10
Inventor 陈更新曼苏乐
Owner 江苏汉尔源智能科技有限公司
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