Primary coil circuit for wireless power transfer, ground assembly using the same, and manufacturing method therefor
First Claim
1. A primary coil circuit of a ground assembly for wirelessly transferring power to a secondary coil, the primary coil circuit comprising:
- a primary coil magnetically coupled to the secondary coil and having a first terminal and a second terminal;
a second capacitor having a first terminal and a second terminal connected to the first terminal of the primary coil;
a first inductor having a first terminal coupled to a first input terminal of a power source and a second terminal coupled to the first terminal of the second capacitor; and
a first capacitor having a first terminal coupled commonly to the second terminal of the first inductor and the first terminal of the second capacitor and a second terminal coupled commonly to the second terminal of the primary coil and a second input terminal of the power source,wherein a first inductance of the first inductor is smaller than a second inductance of the primary coil, and the first inductance is calculated by multiplying the second inductance of the primary coil and a value obtained by dividing a second capacitance of the second capacitor by a sum of a first capacitance of the first capacitor and the second capacitance of the second capacitor.
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Accused Products
Abstract
A primary coil circuit of a ground assembly for wirelessly transferring power to a secondary coil includes: a primary coil magnetically coupled to the secondary coil and having a first terminal and a second terminal; a second capacitor having a first terminal and a second terminal connected to the first terminal of the primary coil; a first inductor having a first terminal coupled to a first input terminal of a power source and a second terminal coupled to the first terminal of the second capacitor; and a first capacitor having a first terminal coupled commonly to the second terminal of the first inductor and the first terminal of the second capacitor and a second terminal coupled commonly to the second terminal of the primary coil and a second input terminal of the power source.
6 Citations
15 Claims
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1. A primary coil circuit of a ground assembly for wirelessly transferring power to a secondary coil, the primary coil circuit comprising:
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a primary coil magnetically coupled to the secondary coil and having a first terminal and a second terminal; a second capacitor having a first terminal and a second terminal connected to the first terminal of the primary coil; a first inductor having a first terminal coupled to a first input terminal of a power source and a second terminal coupled to the first terminal of the second capacitor; and a first capacitor having a first terminal coupled commonly to the second terminal of the first inductor and the first terminal of the second capacitor and a second terminal coupled commonly to the second terminal of the primary coil and a second input terminal of the power source, wherein a first inductance of the first inductor is smaller than a second inductance of the primary coil, and the first inductance is calculated by multiplying the second inductance of the primary coil and a value obtained by dividing a second capacitance of the second capacitor by a sum of a first capacitance of the first capacitor and the second capacitance of the second capacitor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A ground assembly for wirelessly transferring power to a secondary coil, the ground assembly comprising:
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a primary coil magnetically coupled to the secondary coil and having a series resonance circuit; a second capacitor connected in series with the primary coil; a parallel resonance circuit coupled to the series resonance circuit of the primary coil and the second capacitor and having a first inductor and a first capacitor; at least one third capacitor connected in parallel to the second capacitor; at least one switching element connected in series to the at least one third capacitor or the second capacitor; and a controller controlling an ON or OFF operation of the at least one switching element. - View Dependent Claims (8, 9, 10, 11)
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12. A method of manufacturing a ground assembly for wirelessly transferring power to a secondary coil, comprising:
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forming a primary coil circuit; and connecting a power conversion unit converting a power from a power source and transferring the converted power to the primary coil circuit, wherein the primary coil circuit includes; a primary coil magnetically coupled to the secondary coil and having a first terminal and a second terminal; a second capacitor having a first terminal and a second terminal connected to the first terminal of the primary coil; a first inductor having a first terminal coupled to a first input terminal of the power source and a second terminal coupled to the first terminal of the second capacitor; and a first capacitor having a first terminal coupled commonly to the second terminal of the first inductor and the first terminal of the second capacitor and a second terminal coupled commonly to the second terminal of the primary coil and a second input terminal of the power source, and a capacitance of the second capacitor is determined based on a target current applied to the primary coil, wherein a first inductance of the first inductor is smaller than a second inductance of the primary coil, and the first inductance is calculated by multiplying the second inductance of the primary coil and a value obtained by dividing a second capacitance of the second capacitor by a sum of a first capacitance of the first capacitor and the second capacitance of the second capacitor. - View Dependent Claims (13, 14, 15)
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Specification