Wireless power transmitting device and wireless power transmitting system
First Claim
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1. 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.
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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.
14 Citations
13 Claims
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1. A wireless power transmitting device that wirelessly transmits power to a power receiving device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A wireless power transmitting system comprising:
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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.
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Specification