Power transmission control device, power transmitting device, non-contact power transmission system, and secondary coil positioning method
First Claim
1. A power transmission control device that controls a power transmitting device of a non-contact power transmission system, the non-contact power transmission system transmitting power from the power transmitting device to a power receiving device via non-contact power transmission through a primary coil and a secondary coil that are electromagnetically coupled, the power transmission control device comprising:
- a power-transmitting-side control circuit that controls power transmission of the power transmitting device to the power receiving device; and
a harmonic detection circuit that detects a harmonic of a drive signal of the primary coil,a resonant circuit being formed when the primary coil and the secondary coil are electromagnetically coupled in a state in which the primary coil and the secondary coil have a given positional relationship, the resonant circuit resonating with the harmonic of the drive signal of the primary coil;
the harmonic detection circuit detecting the harmonic of the drive signal of the primary coil that occurs due to resonance of the resonant circuit; and
the power-transmitting-side control circuit detecting that the primary coil and the secondary coil have the given positional relationship based on a detection result of the harmonic detection circuit.
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Accused Products
Abstract
A power transmission control device used for a non-contact power transmission system includes a power-transmitting-side control circuit that controls power transmission to a power receiving device, and a harmonic detection circuit that detects a harmonic signal of a drive frequency of a primary coil. A resonant circuit (leakage inductance and resonant capacitor) that resonates with the harmonic of the drive frequency of the primary coil L1 is formed in the power receiving device so that harmonic resonance occurs. The harmonic detection circuit detects the harmonic resonance peak of the drive frequency of the primary coil.
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Citations
11 Claims
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1. A power transmission control device that controls a power transmitting device of a non-contact power transmission system, the non-contact power transmission system transmitting power from the power transmitting device to a power receiving device via non-contact power transmission through a primary coil and a secondary coil that are electromagnetically coupled, the power transmission control device comprising:
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a power-transmitting-side control circuit that controls power transmission of the power transmitting device to the power receiving device; and a harmonic detection circuit that detects a harmonic of a drive signal of the primary coil, a resonant circuit being formed when the primary coil and the secondary coil are electromagnetically coupled in a state in which the primary coil and the secondary coil have a given positional relationship, the resonant circuit resonating with the harmonic of the drive signal of the primary coil; the harmonic detection circuit detecting the harmonic of the drive signal of the primary coil that occurs due to resonance of the resonant circuit; and the power-transmitting-side control circuit detecting that the primary coil and the secondary coil have the given positional relationship based on a detection result of the harmonic detection circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A secondary coil positioning method for a non-contact power transmission system that transmits power from a power transmitting device having a primary coil to a power receiving device having a secondary coil via non-contact power transmission through the primary coil and the secondary coil that are electromagnetically coupled, a capacitor being connected to the secondary coil, and a resonant circuit that resonates with a harmonic of a drive signal of the primary coil being formed by a leakage inductance and the capacitor when the primary coil and the secondary coil are electromagnetically coupled in a state in which a position of the primary coil coincides with a position of the secondary coil in a plan view, the method comprising:
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providing a harmonic detection circuit and a notification section in the power transmitting device, the harmonic detection circuit detecting the harmonic of the drive signal of the primary coil that occurs due to resonance of the resonant circuit; and
the notification section indicating a detection result for the relative positional relationship between the primary coil and the secondary coil based on a detection output from the harmonic detection circuit; andmoving the position of the power receiving device using notification information from the notification section as an index to position the secondary coil with respect to the primary coil.
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Specification