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Power transmission method and device of bidirectional wireless electric energy transmission system

A two-way radio and transmission system technology, applied in the direction of output power conversion device, circuit device, DC power input conversion to DC power output, etc., can solve the problems of difficult soft switching and low transmission efficiency, and achieve simplified control and complex The effect of improving the transmission efficiency of the system and reducing the amount of calculation

Active Publication Date: 2020-12-04
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 of bidirectional wireless electric energy transmission system
  • Power transmission method and device of bidirectional wireless electric energy transmission system
  • Power transmission method and device of bidirectional wireless electric energy 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 restrictions on 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 · si...

Embodiment 3

[0131] A power transmission control device for a two-way wireless power transmission system, the two-way wireless power transmission system includes sequentially cascaded primary-side full-bridge conversion circuits, primary-side resonant compensation networks, weakly coupled transformers, secondary-side resonant compensation networks, and secondary-side full-bridges Conversion circuit and filter 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...

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Abstract

The invention, which belongs to the DC / DC converter field, discloses a power transmission method and device of a bidirectional wireless electric energy transmission system. The method comprises stepsof maintaining a switching frequency of a first full-bridge converter unchanged and reducing a switching frequency of a second full-bridge converter under a light load condition, collecting a currentoutput signal of the first full-bridge converter, subtracting the current output signal from a set value, performing PI control, and normalizing the current output signal into an internal phase shiftangle beta2 of the first full-bridge converter, calculating a fundamental wave phase shift phase angle delta of the first full-bridge converter and an internal phase shift angle beta1 of the second full-bridge converter through a ZVS soft switching condition function and an efficiency optimization function based on beta2, updating parameters in the digital processor of the first full-bridge converter according to beta2 and delta, and updating parameters in the digital processor of the second full-bridge converter according to beta1, so that the first full-bridge converter and the second full-bridge converter respectively output symmetrical square waves with the pulse widths of beta2 and beta1, and the component phase difference of the corresponding frequencies of the two symmetrical squarewaves is delta. ZVS soft switching is easier to realize, and the system transmission efficiency is improved.

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 Applications(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
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