Inductance capacitance resonance frequency adjustable resonance magnetic coupling wireless energy transmission system

Abstract

The invention discloses an inductance capacitance resonance frequency adjustable resonance magnetic coupling wireless energy transmission system. Through proper correction of environment setting, peakvoltage on two ends of a coil inductor or a resonance capacitor is detected and the resonance capacitance is adjusted based on the peak voltage until the peak voltage is the maximal for implementation of correction of the multiple resonance capacitors in the system so as to accurately control the LC resonance frequency in a power transmitting terminal and power receiving terminal circuit, therefore, the maximal power transmission efficiency and the maximal transmission power are achieved.

Description

technical field [0001] The present invention relates to a magnetic resonance wireless power transfer system (wireless power transfer system), in particular to a resonant magnetic coupling wireless power transfer system capable of automatically correcting the resonant frequency of an inductor-capacitor (LC). Background technique [0002] Wireless Power Transfer (WPT) is a very convenient technology that can be widely used in portable devices, such as mobile phones, biomedical implants, sensors, electric vehicles and so on. These wireless energy transfer systems usually have two main specifications, one is Power Transfer Efficiency (PTE), which is the ratio of the power transmitted to the load to the supplied power, and the PTE value is less than or equal to 1; The main specification is the maximum transmitted power (Maximal Transferred Power, MTP), that is, the maximum power that the load can receive from the WPT system. [0003] Both non-resonant magnetic coupling (NRMC) an...

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Problems solved by technology

However, when this method is applied to the WPT system, it is necessary to measure the WPT system circuit parameters first to calculate the calibration target value, so it is time-consuming and laborious, and the calibration environment is different from the normal operating environment, so they will have different parasitic capacitance and inductance values. Therefore, The resonant frequency of the corrected WPT system will still be off target during normal operation

[0007] Other known methods of calibrating LC include U.S. Patent No. 7,940,140 B2, U.S. 8,508,308 B2, U.S. Pat. Frequency, etc., there is no correction technology suitable for correcting the resonant frequency of the WPT system to improve its performance.

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