Electromagnetic resonance wireless charging device and control method based on cll resonance conversion

Abstract

The invention discloses an electromagnetic resonance type wireless charging device and a control method based on CLL resonant transformation. The control method comprises the steps that a DC-bus voltage is acquired by a microcontroller, and the microcontroller controls the duty ratio of an MOS tube of a two-way AC / DC rectifier module, so that the stability of the input DC-bus voltage is achieved; through controlling the switching of the MOS tube of a CLL resonant conversion module, the microcontroller can inverts a direct current into an alternating current; a coupling resonance coil of a transmitting terminal sends out contravariant energy of the CLL resonant conversion module and transmits to a coupling resonance coil of a receiving terminal; after a high-frequency alternating current is received by the coupling resonance coil of the receiving terminal, rectification is conducted by an AC / DC rectifier module of the receiving terminal, stable voltage smoothing is conducted, and the coupling resonance coil of the receiving terminal conducts charging on a storage battery; a terminal voltage and a charging current of the storage battery are acquired by the microcontroller, and the duty ratio of the MOS tube of the CLL resonant conversion module is controlled by the microcontroller, so that the set charging current and the over-charge protection function are achieved. The electromagnetic resonance type wireless charging device and the control method based on the CLL resonant transformation has the advantages that working under the switching of zero voltage and zero current is achieved, the switching loss is effectively reduced, the energy transmitting efficiency is improved, and the volume of a wireless transmission device is reduced.

Description

technical field [0001] The present invention relates to the field of wireless charging, in particular to an electromagnetic resonance wireless charging device and control method based on CLL resonance conversion. Background technique [0002] The world is facing more and more serious environmental crisis and energy crisis, the decreasing of fossil fuels and the increasing seriousness of environmental problems have attracted global attention. Electric vehicles have many advantages such as energy saving and environmental protection. Vigorously developing electric vehicles has become one of the important ways to solve the crisis and is an inevitable trend in the future development of the automobile industry. Large-scale electric vehicles as mobile energy storage equipment will be an important pillar of the third industrial revolution (Energy Internet). Now the development of electric vehicles is facing a series of problems such as high battery cost, lower energy density than f...

AI Technical Summary

Problems solved by technology

The resonant frequency of the electromagnetic resonance wireless charging method is generally between several hundred kilohertz to several megahertz. Such a high switching frequency causes a large switching loss, which not only reduces the power of the overall strong magnetic coupling resonant wireless charging system. transmission efficiency, it will also make the switching device heat up, and even cause safety accidents

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