POWER TRANSMISSION CONTROL DEVICE, POWER TRANSMISSION DEVICE, ELECTRONIC APPARATUS, AND LOAD STATE DETECTION CIRCUIT
First Claim
1. A power transmission control device provided in a power transmission device included in a contactless power transmission system in which power is transmitted from the power transmission device to a power receiving device by electromagnetically coupling an elementary coil and a secondary coil and the power is supplied to a load of the power receiving device, the power transmission control device comprisinga load state detection circuit that detects a load state of the power receiving device on the basis of a differential signal between a first signal from a first end of a resonance capacitor forming a resonant circuit with the elementary coil and a second signal from a second end of the resonance capacitor.
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Accused Products
Abstract
There is provided a power transmission control device provided in a power transmission device included in a contactless power transmission system in which power is transmitted from the power transmission device to a power receiving device by electromagnetically coupling an elementary coil and a secondary coil and the power is supplied to a load of the power receiving device. The power transmission control device includes a load state detection circuit that detects a load state of the power receiving device on the basis of a first signal from a first end of a resonance capacitor forming a resonant circuit with the elementary coil and a second signal from a second end of the resonance capacitor.
58 Citations
20 Claims
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1. A power transmission control device provided in a power transmission device included in a contactless power transmission system in which power is transmitted from the power transmission device to a power receiving device by electromagnetically coupling an elementary coil and a secondary coil and the power is supplied to a load of the power receiving device, the power transmission control device comprising
a load state detection circuit that detects a load state of the power receiving device on the basis of a differential signal between a first signal from a first end of a resonance capacitor forming a resonant circuit with the elementary coil and a second signal from a second end of the resonance capacitor.
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20. A load state detection circuit provided in a power transmission device included in a contactless power transmission system in which power is transmitted from the power transmission device to a power receiving device by electromagnetically coupling an elementary coil and a secondary coil and the power is supplied to a load of the power receiving device, the load state detection circuit detecting a load state of the power receiving device, the load state detection circuit comprising:
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a differential amplifier that outputs an amplifier output signal corresponding to a differential signal between a first signal from a first end of a resonance capacitor forming a resonant circuit with the elementary coil and a second signal from a second end of the resonance capacitor; and a phase difference detection circuit that detects a phase difference between the amplifier output signal from the differential amplifier and a reference clock signal and outputs a phase difference signal.
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Specification