Non-contact power transmission device and design method thereof

A non-contact power transmission device comprising an AC power source, a resonant system, and a load,

• the resonant system comprising a primary coil connected to the AC power source, a primary resonance coil, a secondary resonance coil, and a secondary coil connected to the load,
• the non-contact power transmission device being characterized in that a frequency of an AC voltage of the AC power source is set within an input impedance decreasing range, which is a frequency range in which an input impedance of the resonant system is decreased as the frequency of the AC voltage is increased.

A method for designing a non-contact power transmission device comprising an AC power source, a resonant system, and a load,

• the resonant system including a primary coil connected to the AC power source, a primary resonance coil, a secondary resonance coil, and a secondary coil connected to the load,
• the design method being characterized in that, when the relationship between an input impedance of the resonant system and a frequency of an AC voltage of the AC power source is plotted on a graph, the frequency of the AC voltage of the AC power source is set between a first frequency, at which the input impedance has a local maximum value, and a second frequency, which is greater than the first frequency and at which the input impedance has a local minimum value.

A method for designing a non-contact power transmission device comprising an AC power source, a resonant system, and a load,

• the resonant system including a primary coil connected to the AC power source, a primary resonance coil, a secondary resonance coil, and a secondary coil connected to the load,
• the design method being characterized in that a frequency of an AC voltage of the AC power source is set within an input impedance decreasing range, which is a frequency range in which an input impedance of the resonant system is decreased as the frequency of the AC voltage is increased.