Wireless power transmission system, power transmitting device, and power receiving device
First Claim
1. A wireless power transmission system comprising:
- a power transmitting device including;
a transmitting-side electrode, anda voltage generating circuit configured to apply a voltage to the transmitting-side electrode; and
a power receiving device including;
a receiving-side electrode capacitively coupled to the transmitting-side electrode,a step-down circuit configured to decrease a voltage generated in the receiving-side electrode, anda load circuit configured to receive the decreased voltage from the step-down circuit,wherein at least one of the power transmitting device and the power receiving device further comprises an electrostatic shielding element configured to reduce stray capacitance formed between Earth and at least one of the transmitting-side electrode and the receiving-side electrode, respectively,wherein the transmitting-side electrode comprises a transmitting-side active electrode and a transmitting-side passive electrode having a lower potential than the transmitting-side active electrode, andwherein the receiving-side electrode comprises a receiving-side active electrode and a receiving-side passive electrode having a lower potential than the receiving-side active electrode.
1 Assignment
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Accused Products
Abstract
In a power transmitting device constituting a wireless power transmission system, a voltage generating circuit applies a voltage between an active electrode and a passive electrode. In a power receiving device, a voltage generated between an active electrode that is opposed to the active electrode, and a passive electrode that is opposed to or brought into contact with the passive electrode when the power receiving device is placed on the power transmitting device is inputted to a load circuit as a power supply voltage. Passive electrodes of the power transmitting device are provided to electrostatically shield the opposed active electrodes with respect to the earth. Consequently, a wireless power transmission system, a power transmitting device, and a power receiving device are configured so the potential of the power transmitting device and the power receiving device during power transmission is stabilized to thereby prevent malfunction of the power receiving device.
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Citations
16 Claims
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1. A wireless power transmission system comprising:
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a power transmitting device including; a transmitting-side electrode, and a voltage generating circuit configured to apply a voltage to the transmitting-side electrode; and a power receiving device including; a receiving-side electrode capacitively coupled to the transmitting-side electrode, a step-down circuit configured to decrease a voltage generated in the receiving-side electrode, and a load circuit configured to receive the decreased voltage from the step-down circuit, wherein at least one of the power transmitting device and the power receiving device further comprises an electrostatic shielding element configured to reduce stray capacitance formed between Earth and at least one of the transmitting-side electrode and the receiving-side electrode, respectively, wherein the transmitting-side electrode comprises a transmitting-side active electrode and a transmitting-side passive electrode having a lower potential than the transmitting-side active electrode, and wherein the receiving-side electrode comprises a receiving-side active electrode and a receiving-side passive electrode having a lower potential than the receiving-side active electrode. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9, 10, 11, 12)
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4. A wireless power transmission system comprising:
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a power transmitting device including; a transmitting-side electrode, and a voltage generating circuit configured to apply a voltage to the transmitting-side electrode; and a power receiving device including; a receiving-side electrode capacitively coupled to the transmitting-side electrode, a step-down circuit configured to decrease a voltage generated in the receiving-side electrode, and a load circuit configured to receive the decreased voltage from the step-down circuit, wherein at least one of the power transmitting device and the power receiving device further comprises an electrostatic shielding element configured to reduce stray capacitance formed between Earth and at least one of the transmitting-side electrode and the receiving-side electrode, respectively, wherein the transmitting-side electrode comprises a first transmitting-side electrode and a second transmitting-side electrode, wherein the receiving-side electrode comprises a first receiving-side electrode opposed to the first transmitting-side electrode, and a second receiving-side electrode opposed to the second transmitting-side electrode, wherein the voltage generating circuit is configured to apply a first voltage to the first transmitting-side electrode and a second voltage to the second transmitting-side electrode, and wherein the first voltage and the second voltage are opposite in phase. - View Dependent Claims (13)
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14. A power transmitting device configured to receive a power receiving device having a receiving-side active electrode and a receiving-side passive electrode, the power transmitting device comprising:
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a transmitting-side active electrode positioned adjacent to the receiving-side active electrode when the power receiving device is placed on the power transmitting device; a transmitting-side passive electrode positioned adjacent to the receiving-side passive electrode when the power receiving device is placed on the power transmitting device; a voltage generating circuit configured to apply a voltage between the transmitting-side active electrode and the transmitting-side passive electrode; and an electrostatic shielding element configured to reduce stray capacitance formed between Earth and at least one of the transmitting-side active electrode and the receiving-side active electrode when the power receiving device is placed on the power transmitting device wherein; the transmitting-side active electrode comprises a first transmitting-side electrode and a second transmitting-side electrode, the voltage generating circuit is configured to apply a first voltage to the first transmitting-side electrode and a second voltage to the second transmitting-side electrode, and the first voltage and the second voltage are opposite in phase.
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15. A power receiving device configured to receive power from a power transmitting device having a transmitting-side active electrode and a transmitting-side passive electrode, the power receiving device comprising:
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a receiving-side active electrode positioned adjacent to the transmitting-side active electrode when the power receiving device is placed on the power transmitting device; a receiving-side passive electrode positioned adjacent to the transmitting-side passive electrode when the power receiving device is placed on the power transmitting device; an electrostatic shielding element section configured to reduce stray capacitance formed between Earth and at least one of the receiving-side active electrode and the transmitting-side active electrode when the power receiving device is placed on the power transmitting device; a step-down circuit configured to decrease a voltage generated between the receiving-side active electrode and the receiving-side passive electrode; and a load circuit configured to receive the decreased voltage from the step-down circuit. - View Dependent Claims (16)
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Specification