Low-energy-consumption high-frequency wireless charging system for lithium battery

Abstract

The invention discloses a low-energy-consumption high-frequency wireless charging system for a lithium battery. The wireless charging system comprises a power supply module, wherein the power supply module is connected in series with a first resonance unit, the first resonance unit is electrically connected with a tuning module, the tuning module comprises a first shunting unit and a second resonance unit which are electrically connected with the first resonance unit, the first shunting unit is electrically connected with a third resonance unit and a rectification module, the third resonance unit is connected with the rectification module in parallel, the rectification module is electrically connected with a voltage stabilization module, the voltage stabilization module is connected with apower storage element in parallel, and the power storage element is connected with a grounding part. By means of the system structure, the tuning module can be used for enabling the power storage element to have a charging curve with good efficiency when being charged so as to achieve the effect of class E wireless rapid charging.

Description

technical field [0001] The invention relates to a low-energy high-frequency wireless charging system for a lithium battery, in particular to a low-energy high-frequency wireless charging system for a lithium battery that has a better charging curve and can directly charge the lithium battery wirelessly and rapidly. Background technique [0002] In recent years, wireless power transfer (WPT) via inductive resonant coupling has become popular for charging various electronic devices (e.g., mobile phones, laptops, wearable devices, medical implants) and even electric vehicles. Rapid progress has been made in coil design, compensation topologies, control strategies, etc. for WPTs operating at high power in kilohertz (kHz). Meanwhile, in order to reduce the size and weight of the WPT system, it is preferable to further increase the operating frequency to several megahertz (MHz), such as 6.78 and 13.56 MHz. This is especially beneficial for the charging of mobile devices, since hi...

AI Technical Summary

Problems solved by technology

[0007] In addition, the input reactance of Class E rectifiers is not negligible at MHz and varies with battery voltage and current. This apparent and varying input reactance of Class E rectifiers increases power losses and results in high efficiency MHz E Complicating the Design of Similar Wireless Battery Charging Systems

[0008] However, due to the non-negligible and variable input reactance of the Class E rectifier, these existing methods are not effective for the Class E wireless charging system of the wireless battery.

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