Detecting device, power receiving device, contactless power transmission system, and detecting method
First Claim
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1. A power receiving device, comprising:
- resonance circuitry configured to receive a power transmission signal and including a first coil configured to electromagnetically couple to an external power transmitting device;
a memory configured to store a reference value;
control circuitry configured to retrieve the reference value from the memory;
a charge section configured to store a power obtained from the power transmission signal and to supply the power to the control circuitry; and
a separator configured to electrically separate a load from the resonance circuitry during a measurement of a Q-factor, the Q-factor being an index representing the relationship between retention and loss of energy in the resonance circuitry or a circuit of the external power transmitting device that includes a second coil.
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Abstract
Disclosed herein is a detecting device including a coil electromagnetically coupled to the external, a resonant circuit that includes at least the coil, and a detecting section that superimposes a measurement signal for measuring the Q-factor of the resonant circuit on a power transmission signal transmitted to the coil in a contactless manner and removes the power transmission signal from an alternating-current signal obtained by superimposing the measurement signal on the power transmission signal. The detecting section measures the Q-factor by using the alternating-current signal from which the power transmission signal is removed.
27 Citations
10 Claims
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1. A power receiving device, comprising:
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resonance circuitry configured to receive a power transmission signal and including a first coil configured to electromagnetically couple to an external power transmitting device; a memory configured to store a reference value; control circuitry configured to retrieve the reference value from the memory; a charge section configured to store a power obtained from the power transmission signal and to supply the power to the control circuitry; and a separator configured to electrically separate a load from the resonance circuitry during a measurement of a Q-factor, the Q-factor being an index representing the relationship between retention and loss of energy in the resonance circuitry or a circuit of the external power transmitting device that includes a second coil. - View Dependent Claims (2, 3, 4, 5)
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6. A power receiving method, comprising:
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receiving a power transmission signal by resonance circuitry including a first coil configured to electromagnetically couple to an external power transmitting device; storing a reference value in a memory; retrieving the reference value from the memory by control circuitry; storing a power obtained from the power transmission signal and supplying the power to the control circuitry; and electrically separating a load from the resonance circuitry during a measurement of a Q-factor, the Q-factor being an index representing the relationship between retention and loss of energy in the resonance circuitry or a circuit of the external power transmitting device that includes a second coil. - View Dependent Claims (7, 8, 9, 10)
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Specification