Wireless power transmission device
A coil structure for wireless power transmission is provided. The coil structure comprises: a primary resonance coil wound in a spiral shape around a centripetal point; a primary induction coil, which supplies power to the primary resonance coil in a nonconnected state with an input or output terminal of the primary resonance coil and is wound in a spiral shape on a substantially same plane around a substantially same centripetal point as the centripetal point; a switch configured to be parallel with the primary resonance coil so as to control the ON and OFF of an operation of the primary resonance coil; and a capacitor coupled to the primary resonance coil so as to form a magnetic resonance with the primary resonance coil.
1. A wireless power transmission apparatus comprising:
a primary core comprising a primary resonant coil wound in a spiral form around a center point and a primary inductive coil supplying power to the primary resonant coil in a contactless form with an input terminal or an output terminal of the primary resonant coil and wound in a spiral form on a substantially same plane around a substantially same center point as the center point of the primary resonant coil, wherein the primary core is configured to operate in either an inductive operation mode or a resonant operation mode to transmit wireless power to a wireless power reception apparatus;
a driving circuit connected to the primary core and configured to apply a driving signal to the primary core;
a control circuit connected to the primary core and the driving circuit and configured to provide a control signal for controlling a switch of the primary core;
a plurality of capacitors that includes capacitors connected to both ends of the switch of the primary core; and
a measurement circuit configured to measure a current or voltage of the primary core.
2. The wireless power transmission apparatus of claim 1 , wherein the control signal controls operation of the switch, the switch disposed in parallel with the primary resonant coil of the primary core, and wherein the control signal turns on the switch in the resonant operation mode and the control signal turns off the switch in the inductive operation mode.
3. The wireless power transmission apparatus of claim 1 , wherein the primary resonant coil and the primary inductive coil are wound side by side at an inner side close to the center point and the primary resonant coil is extended and wound at an outer side distant from the center point.
4. The wireless power transmission apparatus of claim 1 , wherein the primary resonant coil is extended and wound at an inner side close to the center point and the primary resonant coil and the primary inductive coil are wound side by side at an outer side distant from the center point.
5. The wireless power transmission apparatus of claim 1 , wherein the primary resonant coil and the primary inductive coil are wound such that a pattern in which the primary inductive coil is dually wound side by side and the primary resonant coil is adjacently wound outside the primary inductive coil is repeated at least once.
6. A wireless power transmission coil structure comprising:
a primary resonant coil wound in a spiral form around a center point;
a primary inductive coil supplying power to the primary resonant coil in a contactless form with an input terminal or an output terminal of the primary resonant coil and wound in a spiral form on a substantially same plane around a substantially same center point as the center point of the primary resonant coil;
a switch disposed in parallel with the primary resonant coil to control ON and OFF of an operation of the primary resonant coil; and
a capacitor coupled to the primary resonant coil so as to form a magnetic resonance with the primary resonant coil, wherein the switch is turned on in a resonant operation mode, and the switch is turned off in an inductive operation mode.
7. The wireless power transmission coil structure of claim 6 , wherein the switch comprises a plurality of Field Effect Transistors (FETs) that maintain a switch-on state regardless of a phase of a voltage applied to the primary resonant coil.
8. The wireless power transmission coil structure of claim 6 , wherein the primary resonant coil and the primary inductive coil are wound side by side at an inner side close to the center point and the primary resonant coil is extended and wound at an outer side distant from the center point.
9. The wireless power transmission coil structure of claim 6 , wherein the primary resonant coil is extended and wound at an inner side close to the center point and the primary resonant coil and the primary inductive coil are wound side by side at an outer side distant from the center point.
10. The wireless power transmission coil structure of claim 6 , wherein the primary resonant coil and the primary inductive coil are wound such that a pattern in which the primary inductive coil is dually wound side by side and the primary resonant coil is adjacently wound outside the primary inductive coil is repeated at least once.
11. A wireless power transmission method comprising:
transmitting power generated by magnetic induction in a primary inductive coil wound in a spiral form around a center point to a primary resonant coil, here, the primary resonant coil being wound in a spiral form on a same plane around a substantially same center point as the center point and being provided in a contactless form with an input terminal and an output terminal of the primary inductive coil;
generating a magnetic resonance in the primary resonant coil and transmitting the power to a wireless power reception apparatus; and
controlling ON and OFF of an operation of the primary resonant coil based on a switch disposed in parallel with the primary resonant coil, wherein the controlling of ON and OFF of the operation comprises turning on the switch in a resonant operation mode and turning off the switch in an inductive operation mode.
12. The wireless power transmission method of claim 11 , wherein the primary resonant coil and the primary inductive coil are wound side by side at an inner side close to the center point and the primary resonant coil is extended and wound at an outer side distant from the center point.
13. The wireless power transmission method of claim 11 , wherein the primary resonant coil is extended and wound at an inner side close to the center point and the primary resonant coil and the primary inductive coil are wound side by side at an outer side distant from the center point.
14. The wireless power transmission method of claim 11 , wherein the primary resonant coil and the primary inductive coil are wound such that a pattern in which the primary inductive coil is dually wound side by side and the primary resonant coil is adjacently wound outside the primary inductive coil is repeated at least once.