Wireless power transmitter
First Claim
1. A wireless power transmitting apparatus configured to transmit an electric power signal comprising any one from among an electric field, a magnetic field and an electromagnetic field to a wireless power receiving apparatus/ the wireless power transmitting apparatus comprising:
- a transmission antenna comprising a transmission coil;
an automatic tuning assist circuit coupled with the transmission antenna; and
a power supply configured to apply an AC driving voltage across a series circuit that comprises the transmission antenna and the automatic tuning assist circuit,wherein the automatic tuning assist circuit comprises;
a first terminal coupled to a first end of the transmission antenna;
a second terminal;
N (N represents an integer) auxiliary capacitors;
a plurality of switches each of which is arranged between two terminals from among the first terminal, the second terminal, and the terminals of the N auxiliary capacitors; and
a first control unit configured to switch on and off the plurality of switches in synchronization with the driving voltage, wherein the AC driving voltage is applied across a second end of the transmission antenna and the second terminal of the automatic tuning assist circuit.
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Accused Products
Abstract
An automatic tuning assist circuit is coupled with a transmission antenna. Multiple switches SW and a first auxiliary capacitor CA are arranged between a first terminal and a second terminal of the automatic tuning assist circuit. A first control unit is configured to switch on and off the multiple switches SW in synchronization with a driving voltage VDRV. A power supply is configured to apply the driving voltage VDRV across a series circuit that comprises the transmission antenna and the automatic tuning assist circuit.
28 Citations
14 Claims
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1. A wireless power transmitting apparatus configured to transmit an electric power signal comprising any one from among an electric field, a magnetic field and an electromagnetic field to a wireless power receiving apparatus/ the wireless power transmitting apparatus comprising:
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a transmission antenna comprising a transmission coil; an automatic tuning assist circuit coupled with the transmission antenna; and a power supply configured to apply an AC driving voltage across a series circuit that comprises the transmission antenna and the automatic tuning assist circuit, wherein the automatic tuning assist circuit comprises; a first terminal coupled to a first end of the transmission antenna; a second terminal; N (N represents an integer) auxiliary capacitors; a plurality of switches each of which is arranged between two terminals from among the first terminal, the second terminal, and the terminals of the N auxiliary capacitors; and a first control unit configured to switch on and off the plurality of switches in synchronization with the driving voltage, wherein the AC driving voltage is applied across a second end of the transmission antenna and the second terminal of the automatic tuning assist circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An automatic tuning assist circuit employed in a wireless power transmitting apparatus configured to transmit an electric power signal comprising any one from among an electric field, a magnetic field, and an electromagnetic field to a wireless power receiving apparatus via a transmission coil, and coupled with the transmission coil, the automatic tuning assist circuit comprising:
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a first terminal coupled to a first end of a transmission antenna including the transmission coil; a second terminal; at least one auxiliary capacitor; a plurality of switches arranged in order to charge and discharge the respective aforementioned at least one auxiliary capacitor using a resonance current that flows through the transmission coil; and a first control unit configured to switch on and off the plurality of switches so as to generate a capacitor voltage across the respective aforementioned at least one auxiliary capacitor, and to apply, to the transmission coil, a correction voltage that corresponds to the capacitor voltage that develops at the aforementioned at least one auxiliary capacitor, wherein an AC driving voltage from a power supply is applied across a second end of the transmission antenna and the second terminal of the automatic tuning assist circuit. - View Dependent Claims (14)
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Specification