Abstract: In a method to measure changes of the pair of differential transmission lines, an in-phase signal is generated by combining first and second signals transmitted through the pair of differential transmission lines, a phase of the second signal being opposite to the first signal. In a transmission line diagnostic device, a signal combiner extracts the first and second signals received by a communication unit, combines the extracted those signals, and generates an in-phase signal, a detector detects the generated in-phase signal, and a determination unit determines an error when a magnitude of the detected in-phase signal is equal to or greater than a threshold value. In a liquid level detection device, a combining unit combines the first and second signals and generate an in-phase signal, a detection unit detects a voltage of the generated in-phase signal, and a calculation unit calculates a liquid level from the detected voltage.

Abstract: A power supplying system magnetically resonates between a primary resonant coil that configures a primary core unit and a secondary resonant coil that configures a secondary core unit for contactlessly supplying the power. The primary and secondary resonant coils are wound around the primary and secondary ferrite cores respectively, and face each other in the direction perpendicular to the axial direction of the primary and secondary resonant coils when supplying the power. The primary and secondary ferrite cores are divided into a plurality of portions along the axial direction of the primary and secondary resonant coils such that a width of the both end portions is shorter than a width of the center portion.

Abstract: Provided is a power supply system in which an electromagnetic leakage is prevented. A power supply side resonance coil provided to a power supply unit and a power receiving side resonance coil provided to a power receiving unit are housed respectively in a conductive power supply side shield case and power receiving side shield case. The power supply side shield case is formed of a bottom wall covering a side of the power supply side resonance coil spaced apart from the power receiving side resonance coil and a vertical wall erecting from a periphery of the bottom wall, and a ferrite is provided onto surfaces of the bottom wall and the vertical wall.

Abstract: Primary and secondary resonance circuits and include primary and secondary resonance coils and primary and secondary capacitors, respectively. Non-contact power supply is conducted by electromagnetic resonance of the primary and secondary resonance circuits and. A changeover circuit changes over connection of the secondary resonance coil and the secondary capacitor to a series connection or a parallel connection. A detection circuit detects impedance on a power receipt side. A changeover control circuit controls changeover conducted by the changeover circuit, depending upon the impedance detected by the detection circuit.

Abstract: In a power supplying side core around which a power supplying side resonant coil is wound that contactlessly supplies power to a power receiving side resonant coil, a pair of protrusion portions is provided that protrudes from central axis direction both sides of the power supplying side resonant coil toward the power receiving side resonant coil. Further, in a power receiving side core around which the power receiving side resonant coil is wound that contactlessly receives power from the power supplying side resonant coil, a pair of protrusion portions is provided that protrudes from central axis direction both sides of the power receiving side resonant coil toward the power supplying side resonant coil.

Abstract: Primary and secondary resonance circuits and include primary and secondary resonance coils and primary and secondary capacitors, respectively. Non-contact power supply is conducted by electromagnetic resonance of the primary and secondary resonance circuits and. A changeover circuit changes over connection of the secondary resonance coil and the secondary capacitor to a series connection or a parallel connection. A detection circuit detects impedance on a power receipt side. A changeover control circuit controls changeover conducted by the changeover circuit, depending upon the impedance detected by the detection circuit.

Abstract: A power supplying unit includes a power supply, a power supplying side resonant coil that resonates with a power receiving side resonant coil mounted on a vehicle and contactlessly supply the power supplied from the power supply to the power receiving side resonant coil, and a conductive power supplying side shield case for housing the power supplying side resonant coil. A power receiving unit includes the power receiving side resonant coil that electromagnetically resonates with the power supplying side resonant coil and contactlessly receive the power from the power supplying side resonant coil, and a power receiving side shield case for housing the power receiving side resonant coil. A ferrite is disposed outside the power receiving side shield case.

Abstract: In a power supplying side core around which a power supplying side resonant coil is wound that contactlessly supplies power to a power receiving side resonant coil, a pair of protrusion portions is provided that protrudes from central axis direction both sides of the power supplying side resonant coil toward the power receiving side resonant coil. Further, in a power receiving side core around which the power receiving side resonant coil is wound that contactlessly receives power from the power supplying side resonant coil, a pair of protrusion portions is provided that protrudes from central axis direction both sides of the power receiving side resonant coil toward the power supplying side resonant coil.

Abstract: A power supplying side resonant coil contactlessly supplies power to a power receiving side resonant coil. The power supplying side resonant coil includes a first power supplying side coil unit and a second power supplying side coil unit disposed side by side on the same axis. The first power supplying side coil unit and the second power supplying side coil unit are opposite to each other in the direction of winding.

Abstract: A power supplying system magnetically resonates between a primary resonant coil that configures a primary core unit and a secondary resonant coil that configures a secondary core unit for contactlessly supplying the power. The primary and secondary resonant coils are wound around the primary and secondary ferrite cores respectively, and face each other in the direction perpendicular to the axial direction of the primary and secondary resonant coils when supplying the power. The primary and secondary ferrite cores are divided into a plurality of portions along the axial direction of the primary and secondary resonant coils such that a width of the both end portions is shorter than a width of the center portion.

Abstract: Provided is a power supply system in which an electromagnetic leakage is prevented. A power supply side resonance coil provided to a power supply unit and a power receiving side resonance coil provided to a power receiving unit are housed respectively in a conductive power supply side shield case and power receiving side shield case. The power supply side shield case is formed of a bottom wall covering a side of the power supply side resonance coil spaced apart from the power receiving side resonance coil and a vertical wall erecting from a periphery of the bottom wall, and a ferrite is provided onto surfaces of the bottom wall and the vertical wall.