Wireless electric energy transmission device

Abstract

The embodiment of the invention discloses a wireless electric energy transmission device. A primary side compensation capacitor (or a secondary side compensation capacitor) is set to comprise N sub-compensation capacitors, and the N sub-compensation capacitors are uniformly connected with an electric energy transmitting coil (or an electric energy receiving coil), so that the electric energy transmitting coil (or the electric energy receiving coil) is correspondingly and equally divided into N equal parts. Through the connecting structure of the distributed capacitors, the voltage of each section of electric energy transmitting coil (or electric energy receiving coil) can be reduced, so that the common-mode current of the transmitting coil to the ground or the circulating current of the receiving coil to metal is reduced; the total compensation capacitance of the primary side or the secondary side and the resonant frequency of the coil are consistent with the working frequency of a system, and the highest energy transmission efficiency can be ensured.

Description

[0001] This application is a divisional application of the Chinese invention patent application with application number 201610619347.3, titled "A Wireless Power Transmission Device", and filed on July 28, 2016. technical field [0002] The present invention relates to the field of wireless power transmission, and more specifically, to a wireless power transmission device. Background technique [0003] The magnetic resonance wireless charging system includes a power transmitter and a power receiver, such as figure 1 As shown, the power transmitter receives external power to generate a spatial magnetic field to wirelessly transmit the energy to the power receiver. [0004] In order to enable the power receiving end to induce a spatial magnetic field in a wider range to generate voltage for electronic equipment, one way is to increase the size and inductance of the transmitting coil in the power transmitting end, but increase the size and inductance of the transmitting coil, I...

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Problems solved by technology

like figure 2 As shown, the high-frequency AC voltage on the coil is more likely to form a common-mode current to the ground through this parasitic capacitance, which increases EMC conduction interference

Moreover, when the size of the transmitting coil increases, the circumference of the coil will increase accordingly. If a high-frequency alternating current flows through the coil, then the high-frequency current is more likely to form electromagnetic waves to radiate out, increasing EMC radiation interference

[0006] Another way is to increase the magnetic field of the transmitting coil by increasing the alternating current in the transmitting coil, which will increase the voltage across the transmitting coil (V=jωLs·Is), requiring a resonant capacitor Cs with a greater withstand voltage value Resonates with the transmitting coil Ls at the system operating frequency point, and after the voltage of the transmitting coil increases, according to the calculation formula of the common mode current above, the common mode current to the ground will also increase

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