Wireless power transmission system
AssigneeMurata Manufacturing Co., Ltd.
InventorKeiichi Ichikawa
Life of this patent
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Abstract
A wireless power transmission system includes a power transmission device, which applies an alternating-current voltage to active and passive electrodes, and a power reception device, which supplies to a load a voltage induced in active and passive electrodes facing the active and passive electrodes of the power transmission device. The power transmission device includes a planar coil connected to the active and passive electrodes and the power reception device includes a planar coil connected to the active and passive electrodes. Magnetic flux generated by the planar coils link with each other causing the planar coils to be magnetic-field coupled with each other. Thus, a wireless power transmission system capable of efficiently transmitting power is provided.
Claims20
A wireless power transmission system comprising:
- a power transmission device including:
- a first power-transmission-side electrode,
- a second power-transmission-side electrode,
- an oscillation circuit configured to apply an alternating-current voltage to the first and second power-transmission-side electrodes, and
- a power-transmission-side coil having a first end connected to the first power-transmission-side electrode and a second end connected to the second power-transmission-side electrode;
- and
- a power reception device including:
- a first power-reception-side electrode positioned to face the first power-transmission-side electrode,
- a second power-reception-side electrode positioned to face the second power-transmission-side electrode,
- a power-reception-side circuit configured to supply to a load a voltage induced in the first and second power-reception-side electrodes by capacitive coupling when the first and second power-reception-side electrodes face the first and second power-transmission-side electrodes, respective, and
- a power-reception-side coil having a first end connected to the first power-reception-side electrode and a second end connected to the second power-reception-side electrode,
- wherein the power-transmission-side coil is magnetic-field coupled to the power-reception-side coil.
A wireless power transmission system comprising:
- a power transmission device including:
- a first power-transmission-side electrode,
- a second power-transmission-side electrode,
- an oscillation circuit configured to apply an alternating-current voltage to the first and second power-transmission-side electrodes,
- a first power-transmission-side coil coupled between the oscillation circuit and the first power-transmission-side electrode,
- a second power-transmission-side coil coupled between the oscillation circuit and the second power-transmission-side electrode;
- and
- a power reception device including:
- a first power-reception-side electrode positioned to face the first power-transmission-side electrode,
- a second power-reception-side electrode positioned to face the second power-transmission-side electrode,
- a power-reception-side circuit configured to supply to a load a voltage induced in the first and second power-reception-side electrodes by capacitive coupling when the first and second power-reception-side electrodes face the first and second power-transmission-side electrodes, respective,
- a first power-reception-side coil coupled between the first power-reception-side electrode and the load,
- a second power-reception-side coil coupled between the second power-reception-side electrode and the load,
- wherein the first and second power-transmission-side coils are magnetic-field coupled to the first and second power-reception-side coils.
A power transmission device for wirelessly transmitting power to a power reception device including first and second power-reception-side electrodes and a power-reception-side coil coupled to the first and second power-reception-side electrodes, the power transmission device comprising:
- a first power-transmission-side electrode configured to face the first power-reception-side electrode and to be capacitively coupled with the first power-reception-side electrode to induce a voltage therebetween when the power reception device is mounted on the power transmission device;
- a second power-transmission-side electrode configured to face the second power-reception-side electrode and to be capacitively coupled with the second power-reception-side electrode to induce a voltage therebetween when the power reception device is mounted on the power transmission device;
- an oscillation circuit configured to apply an alternating-current voltage to the first and second power-transmission-side electrodes;
- and
- a power-transmission-side coil having a first end connected to the first power-transmission-side electrode and a second end connected to the second power-transmission-side electrode,
- wherein the power-transmission-side coil is magnetic-field coupled to the power-reception-side coil of the power reception device when the power reception device is mounted on the power transmission device.
Dependencies are inferred from the claim text.