Wireless power receiver
First Claim
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1. A wireless power receiving apparatus configured to receive an electric power signal transmitted from a wireless power transmitting apparatus, the wireless power receiving apparatus comprising:
- a reception antenna comprising a reception coil and a resonance capacitor connected in series; and
an automatic tuning assist circuit coupled with the reception antenna;
wherein the automatic tuning assist circuit comprises;
a first terminal;
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 second control unit configured to switch on and off the plurality of switches, wherein a periodic voltage occurs across each of the N auxiliary capacitors, andwherein the automatic tuning assist circuit comprises;
a third switch and a third auxiliary capacitor arranged in series between the first terminal and the second terminal; and
a fourth switch arranged between the first terminal and the second terminal such that it is arranged in parallel with the third switch and the third auxiliary capacitor.
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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.
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Citations
12 Claims
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1. A wireless power receiving apparatus configured to receive an electric power signal transmitted from a wireless power transmitting apparatus, the wireless power receiving apparatus comprising:
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a reception antenna comprising a reception coil and a resonance capacitor connected in series; and an automatic tuning assist circuit coupled with the reception antenna; wherein the automatic tuning assist circuit comprises; a first terminal; 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 second control unit configured to switch on and off the plurality of switches, wherein a periodic voltage occurs across each of the N auxiliary capacitors, and wherein the automatic tuning assist circuit comprises; a third switch and a third auxiliary capacitor arranged in series between the first terminal and the second terminal; and a fourth switch arranged between the first terminal and the second terminal such that it is arranged in parallel with the third switch and the third auxiliary capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless power receiving apparatus configured to receive an electric power signal transmitted from a wireless power transmitting apparatus, the wireless power receiving apparatus comprising:
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a reception antenna comprising a reception coil and a resonance capacitor connected in series; and an automatic tuning assist circuit coupled with the reception antenna; wherein the automatic tuning assist circuit comprises; a first terminal; 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 second control unit configured to switch on and off the plurality of switches, wherein a periodic voltage occurs across each of the N auxiliary capacitors, wherein the wireless power receiving apparatus further comprises a transformer having a primary winding connected in series with the reception antenna, and wherein a load to be supplied with electric power is connected to a secondary winding of the transformer.
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12. A wireless power receiving apparatus configured to receive an electric power signal transmitted from a wireless power transmitting apparatus, the wireless power receiving apparatus comprising:
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a reception antenna comprising a reception coil and a resonance capacitor connected in series; and an automatic tuning assist circuit coupled with the reception antenna; wherein the automatic tuning assist circuit comprises; a first terminal; 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 second control unit configured to switch on and off the plurality of switches, wherein a periodic voltage occurs across each of the N auxiliary capacitors, and wherein the automatic tuning assist circuit is coupled in series with the reception antenna via a transformer.
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Specification