Secondary coil of receiver for non-contact charging system

Abstract

Provided is a secondary coil (40) applied to an electromagnetic induction type non-contact charging system according to the present invention, the secondary coil including: a substrate (41); a first coil 42 stacked on one side of the substrate (41) and having a first internal space (42a) formed in its center; a second coil 43 stacked on the other side of the substrate (41) and having a second internal space (43a) formed in its center; a first additional pattern (44) electrically connected to the first coil (42); and a second additional pattern (45) electrically connected to the second coil (43), wherein the first internal space (42a) and the second internal space (43a) are not vertically aligned, but "are non-overlappingly arranged" to deviate by a predetermined distance in a horizontal direction.

Description

technical field [0001] The present invention relates generally to contactless charging systems, and more particularly to a receiver's secondary coil for a contactless charging system for use in a transmitter's primary coil and a receiver's Electromagnetic induction generated between a secondary coil placed close to the primary coil charges a battery electrically connected to the secondary coil. Background technique [0002] Repeatedly rechargeable batteries have been widely used in place of disposable batteries to power various portable devices as well as cellular phones. Generally, a wired (contact) charging method is widely used in charging a rechargeable battery, but recently a non-contact (wireless) charging method is increasingly used. [0003] Examples of conventional techniques related to non-contact charging of cellular phones are as follows: "Contactless charging system of radio telephone" disclosed in Korean Patent Publication No. 10-1995-0005819 (published on May...

AI Technical Summary

Problems solved by technology

[0015] However, the "motor control method" and the "multiple primary coil-based method" have disadvantages in that the product cost is relatively increased due to an increase in the number of parts compared to the "magnetic method"

In addition, the motor control method has a limitation that the weight of the primary coil should be limited in order to reduce the load applied to the motor, and the method based on a plurality of primary coils has a problem in that the size of the transmitter is excessively reduced due to the array structure of the primary coil. increase, should limit the size of each coil in the primary coil

However, when the magnetic method is applied to a cellular phone, there are problems in that the size and weight of the cellular phone are increased due to the presence of the magnet, and the applied magnet makes any other magnetic field device (for example, a compass) installed in the cellular phone , gyroscope, etc.) does not work

[0020] However, according to the power transmission control method, although charging efficiency is improved by changing the charging frequency within a range of, for example, 205kHz to 110kHz, and this range is within a range in which induced electromotive force is generated; When deviating, the charging efficiency decreases by up to 20% or more compared to the maximum charging efficiency at, for example, the outermost position where the smallest induced electromotive force is induced

Therefore, there is a limitation that the supplement to the charging efficiency is not sufficiently performed

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