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Power transmission method and device for a two-way wireless power transmission system

A two-way radio and transmission system technology, applied in the output power conversion device, circuit device, DC power input conversion to DC power output and other directions, can solve the problems of low transmission efficiency, difficult soft switching implementation, etc., to improve transmission efficiency , simplify the control complexity, reduce the effect of switching loss

Active Publication Date: 2022-02-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects and improvement needs of the prior art, the present invention provides a power transmission method of a two-way wireless power transmission system, the purpose of which is to switch the system to harmonic-fundamental wave when the transmission efficiency of the two-way wireless power transmission system is low Hybrid power transmission method to solve the problems of low transmission efficiency and difficulty in implementing soft switching in the existing two-way wireless power transmission system

Method used

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  • Power transmission method and device for a two-way wireless power transmission system
  • Power transmission method and device for a two-way wireless power transmission system
  • Power transmission method and device for a two-way wireless power transmission system

Examples

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Embodiment 1

[0077] A power transfer method for a two-way wireless power transfer system, such as figure 1 As shown, the two-way wireless power transmission system includes a cascaded primary-side full-bridge conversion circuit, a primary-side resonant compensation network, a weakly coupled transformer, a secondary-side resonant compensation network, a secondary-side full-bridge conversion circuit and a filter circuit; figure 2 As shown, the power transmission method of the two-way wireless power transmission system provided in this embodiment includes:

[0078] When the two-way wireless power transmission system meets the preset light-load conditions, the switching frequency of the first full-bridge converter is kept unchanged, and the switching frequency of the second full-bridge converter is reduced; in this embodiment, the first full-bridge The converter is a secondary full-bridge converter, and the second full-bridge converter is a primary full-bridge converter; in some other embodim...

Embodiment 2

[0121] A power transmission method for a two-way wireless power transmission system, this embodiment is similar to the above-mentioned embodiment 1, the difference is that, considering the constraints of the ZVS soft-switching condition function G1 and the efficiency optimization function G2 in the above-mentioned embodiment 1 for The control of the system is relatively complicated. On the basis of Embodiment 1, this embodiment simplifies the restriction of the ZVS soft-switching condition function G1 and the efficiency optimization function G2 to make the control of the system more complicated.

[0122] For example, for the efficiency optimization function G2, when K β optimal value K β_opt When greater than 1, 3 / 2β is satisfied at this time 1 >.1 / 2β 2 ,

[0123] The ZVS soft switching condition function G1 and efficiency optimization function G2 can be simplified as:

[0124] G1:

[0125] G2:β 1 =2 / 3sin -1 (K β_opt · sin(β 2 / 2));

[0126] where for K β_opt · sin(...

Embodiment 3

[0131] A power transmission device for a two-way wireless power transmission system. The two-way wireless power transmission system includes a primary-side full-bridge conversion circuit cascaded in sequence, a primary-side resonant compensation network, a weak coupling transformer, a secondary-side resonant compensation network, and a secondary-side full-bridge conversion circuit and filtering circuit; the power transmission device provided by this implementation includes:

[0132] The frequency control module is used to maintain the switching frequency of the first full-bridge converter unchanged and reduce the switching frequency of the second full-bridge converter when the two-way wireless power transmission system meets the preset light-load condition; the first full-bridge The converter is a full-bridge converter on the primary side, and the second full-bridge converter is a full-bridge converter on the secondary side, or the first full-bridge converter is a full-bridge c...

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Abstract

The invention discloses a power transmission method and device of a two-way wireless power transmission system, belonging to the field of DC / DC converters, including: maintaining the switching frequency of the first full-bridge converter under light load conditions, and reducing the switching frequency of the second full-bridge converter. Switching frequency of the bridge converter; collect the output signal of the first full-bridge converter, perform PI control after making a difference with the set value, and normalize it to the internal shift angle β of the first full-bridge converter 2 ; based on beta 2 , calculate the fundamental phase shift angle δ of the first full-bridge converter and the internal shift angle β of the second full-bridge converter by the ZVS soft-switching condition function and efficiency optimization function 1 ;according to β 2 and δ update the parameters in the digital processor of the first full-bridge converter according to β 1 Update the parameters in the digital processor of the second full-bridge converter, so that the output pulse width of the first full-bridge converter and the second full-bridge converter is β 2 and beta 1 The symmetrical square wave of , and the phase difference of the corresponding frequency components of the two symmetrical square waves is δ. The invention is easier to realize ZVS soft switch and improves system transmission efficiency.

Description

technical field [0001] The invention belongs to the field of DC / DC converters, and more specifically relates to a power transmission method and device for a two-way wireless power transmission system. Background technique [0002] In recent years, with the increasingly high requirements for energy transmission security, reliability and efficiency, wireless power transmission has become a research hotspot. At present, the main research direction is the one-way transmission system. With the development of energy Internet and smart distribution network related technologies, the two-way wireless charging system begins to have unique advantages. Due to the characteristics of bidirectional power transmission, the vehicle battery power and the grid can flow in both directions. Therefore, the electric energy of the on-board battery can flow to the grid, and through intelligent regulation, orderly charging and peak-shaving and valley-filling optimization functions for the grid can b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/12H02M3/335H02M1/088
CPCH02J50/12H02M3/33515H02M3/33584H02M3/33523H02M1/088H02M1/0058Y02B70/10
Inventor 陈昌松蒋梦杰贾舒然段善旭陈浩文
Owner HUAZHONG UNIV OF SCI & TECH