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US 9,806,542 B2Granted
Wireless power transmitting device and wireless power transmitting system
AssigneePanasonic Corporation
InventorsKenichi Asanuma, Hiroshi Yamamoto
Life of this patent
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Abstract
A wireless power transmitting device includes a self-oscillator circuit, a detection circuit that detects at least one of an oscillation frequency of the self-oscillator circuit and an output voltage of the self-oscillator circuit, a detection resonator that outputs, to detect a position of the power receiving device, power output by the self-oscillator circuit, and a control circuit that detects a degree to which the power receiving device approaches the detection resonator, based on a result of a detection performed by the detection circuit.
Claims13
A wireless power transmitting device that wirelessly transmits power to a power receiving device, comprising:
- a self-oscillator circuit;
- a detection circuit that detects at least one of an oscillation frequency of the self-oscillator circuit or an output voltage of the self-oscillator circuit;
- a detection transmitter resonator comprising a detection resonator that outputs, to detect a position of the wireless power receiving device, power output by the self-oscillator circuit;
- a control circuit that detects a degree to which the power receiving device approaches the detection resonator, based on a result of a detection performed by the detection circuit;
- a power transmission circuit that is connected to the detection transmitter resonator and that outputs AC power for transmitting power;
- and
- a first switch that switches a conduction state of a current between the detection transmitter resonator and the self-oscillator circuit;
- and
- a control circuit that switches a mode between an alignment mode, in which the first switch is turned on to operate the self-oscillator circuit, and a power transmission mode, in which the first switch is turned off to operate the power transmission circuit,
- wherein the detection transmitter resonator includes a capacitor, an inductor and a detection coil, the inductor being connected to the oscillation circuit and in parallel with the detection coil,
- wherein the wireless power transmitting device further comprises a second switch that switches a conduction state of a current from an output of the oscillation circuit to the inductor,
- wherein the detection circuit detects whether or not an approaching object is a power receiving coil of the power receiving device based on a change in the oscillation frequency when the second switch is in one of an on-state and an off-state, and detects the degree to which the power receiving coil approaches the detection coil based on a change in the oscillation frequency when the second switch is in an other state of the on-state and the off-state.
9 more elements
A wireless power transmitting system comprising:
- a wireless power transmitting device;
- and
- a power receiving device including a receiver resonator, wherein
- the wireless power transmitting device includes:
- a self-oscillator circuit;
- a detection circuit that detects at least one of an oscillation frequency of the oscillation circuit or an output voltage of the oscillation circuit;
- a detection transmitter resonator comprising a detection resonator that outputs, to detect a position of the wireless power receiving device, power output by the self-oscillator circuit;
- a control circuit that detects a degree to which the power receiving device approaches the detection resonator, based on a result of a detection performed by the detection circuit;
- a power transmission circuit that is connected to the detection transmitter resonator and that outputs AC power for transmitting power;
- a first switch that switches a conduction state of a current between the detection transmitter resonator and the self-oscillator circuit;
- and
- a control circuit that switches a mode between an alignment mode, in which the first switch is turned on to operate the self-oscillator circuit, and a power transmission mode, in which the first switch is turned off to operate the power transmission circuit,
- wherein the detection transmitter resonator includes a capacitor, an inductor and a detection coil, the inductor being connected to the oscillation circuit and in parallel with the detection coil,
- wherein the wireless power transmitting device further comprises a second switch that switches a conduction state of a current from an output of the oscillation circuit to the inductor,
- wherein the detection circuit detects whether or not an approaching object is a power receiving coil of the power receiving device based on a change in the oscillation frequency when the second switch is in one of an on-state and an off-state, and detects the degree to which the power receiving coil approaches the detection coil based on a change in the oscillation frequency when the second switch is in an other state of the on-state and the off-state.
12 more elements
Dependencies are inferred from the claim text.