Double-channel wireless power supply system constant current output method based on composite coil

A technology of constant current output and wireless power supply, applied in circuit devices, electrical components, etc., to ensure the output power and overcome the sharp reduction of mutual inductance

CN111509867AActive Publication Date: 2020-08-07NANJING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-08-07

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Abstract

The invention provides a composite coil which comprises a DD coil, a solenoid coil and a magnetic core, the DD coil is a bipolar coil, two sub-coils of the DD coil are equal in size and opposite in winding direction, and a generated magnetic field is distributed along a coil axis, the magnetic core is arranged below the DD coil, the solenoid coil is wound on the DD coil in parallel, the solenoid coil is a multi-turn rectangular winding, and the solenoid coil and the magnetic core form a solenoid structure. The invention further provides a double-channel wireless power supply system constant current output method based on the coil. Through matching the impedance value of a load, the self-inductance of a transmitting solenoid coil, the resonance inductance of a receiving end, the mutual inductance between a transmitting DD coil and a receiving DD coil, which changes along with the offset in the X direction, and the mutual inductance between a transmitting solenoid coil and the receivingDD coil, which changes along with the offset in the X direction, when the transmitting coil and the receiving coil deviate, the current passing through the load is still kept constant. According to the invention, the defect that the current is seriously reduced under the condition that the transmitting coil and the receiving coil of a traditional WPT system deviate is overcome, the material utilization rate of the resonant inductor is improved, and the space occupied by the transmitting coil is saved.
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Description

technical field

[0001] The invention relates to wireless power transmission technology, in particular to a constant current output method of a dual-channel wireless power supply system based on a composite coil. Background technique

[0002] Wireless power transmission technology is a technology that uses high-frequency magnetic fields to achieve energy transmission. Compared with traditional wire transmission methods, it can avoid insulation problems and safety hazards caused by sparks, and is especially suitable for special applications such as mines and underwater , has high flexibility and reliability, so it has received more and more attention. In the wireless power transfer system of the traditional concept, the receiving coils are all facing the transmitting coils. However, in practical applications, it is impossible to ensure that the transmitting and receiving coils are facing each other at all times. The offset between the transmitting coil and the receiving coil ...

Examples

Embodiment Construction

[0030] The solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] The present invention is a dual-channel wireless power supply system constant current output method based on composite coils. Aiming at the coil system integrated with DD coils and flat solenoid coils, the DD coils and flat solenoid coils are respectively used as the coupling in the LCC topology. The coil and the resonant coil, when the transmitting coil and the receiving coil are facing each other, the DD coil and the flat solenoid coil jointly transmit energy to the receiving coil; when the receiving coil is offset in the longitudinal direction, due to the characteristics of the DD coil and the flat helical coil , the magnetic flux received by the receiving coil will hardly change, which ensures the constant current output of the load; when the receiving coil is offset in the lateral direction, the magnetic flux of the ...