Power transmission system
First Claim
1. A power transmission system comprising:
- a power transmission apparatus including a primary-side coupling electrode configured to electrically couple to a secondary-side coupling electrode and connected to a load circuit of a power receiving apparatus, a high-frequency voltage generating circuit configured to generate and apply a high-frequency voltage to the primary-side coupling electrode, and a driving power circuit that supplies driving power to the high-frequency voltage generating circuit;
a center frequency acquiring unit configured to sweep a frequency range to acquire a center frequency in a state in which electrical coupling between the secondary-side coupling electrode and the load circuit is weakened, the center frequency being a frequency at which the generated high-frequency voltage is minimized or substantially minimized with respect to variation in frequency of the high-frequency voltage generated by the high-frequency voltage generating circuit; and
a control unit configured to set a driving frequency, which is the frequency of the high-frequency voltage generated by the high-frequency high voltage generating circuit, to the center frequency or a frequency near the center frequency and supply power to the power receiving apparatus;
wherein a resonant frequency of a first resonant circuit composed of the primary-side coupling electrode and the high-frequency voltage generating circuit substantially coincides with a resonant frequency of a second resonant circuit composed of the secondary-side coupling electrode and the load circuit, andwherein the center frequency acquiring unit is further configured to acquire the high-frequency voltage within a frequency range including the frequencies of two coupling modes occurring in a state in which the first resonant circuit is coupled to the second resonant circuit.
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Accused Products
Abstract
A power transmission system a power transmission apparatus, a center frequency acquiring unit, and a control unit. The power transmission apparatus includes a primary-side coupling electrode electrically configured to couple to a secondary-side coupling electrode and connected load circuit of a power receiving apparatus, a high-frequency voltage generating circuit configured to generate and apply a high-frequency voltage to the primary-side coupling electrode, and a driving power circuit that supplies driving power to the high-frequency voltage generating circuit. The center frequency acquiring unit acquires a center frequency at which a high-frequency high voltage applied to coupling electrode is minimized in a state in which a low load is applied to the secondary-side coupling electrode of the power receiving apparatus and the frequency of the generated high-frequency voltage is varied. The control unit sets a driving frequency of the high-frequency voltage generating circuit at or near the center frequency to supply power to the power receiving apparatus.
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Citations
19 Claims
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1. A power transmission system comprising:
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a power transmission apparatus including a primary-side coupling electrode configured to electrically couple to a secondary-side coupling electrode and connected to a load circuit of a power receiving apparatus, a high-frequency voltage generating circuit configured to generate and apply a high-frequency voltage to the primary-side coupling electrode, and a driving power circuit that supplies driving power to the high-frequency voltage generating circuit; a center frequency acquiring unit configured to sweep a frequency range to acquire a center frequency in a state in which electrical coupling between the secondary-side coupling electrode and the load circuit is weakened, the center frequency being a frequency at which the generated high-frequency voltage is minimized or substantially minimized with respect to variation in frequency of the high-frequency voltage generated by the high-frequency voltage generating circuit; and a control unit configured to set a driving frequency, which is the frequency of the high-frequency voltage generated by the high-frequency high voltage generating circuit, to the center frequency or a frequency near the center frequency and supply power to the power receiving apparatus; wherein a resonant frequency of a first resonant circuit composed of the primary-side coupling electrode and the high-frequency voltage generating circuit substantially coincides with a resonant frequency of a second resonant circuit composed of the secondary-side coupling electrode and the load circuit, and wherein the center frequency acquiring unit is further configured to acquire the high-frequency voltage within a frequency range including the frequencies of two coupling modes occurring in a state in which the first resonant circuit is coupled to the second resonant circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification