HIGH-FREQUENCY POWER DEVICE, POWER TRANSMISSION DEVICE, AND POWER TRANSFER SYSTEM
First Claim
1. A high-frequency power device comprising:
- a transformer;
a high-frequency voltage generating circuit configured to feed a high-frequency voltage to a primary coil of the transformer so that the primary coil forms an electric feeder section; and
a divider configured to divide a voltage across opposite terminals of a secondary coil of the transformer or opposite terminals of an element of a circuit associated with the secondary coil at a predetermined voltage ratio, wherein;
the divider is a series circuit in which a first impedance element and a second impedance element are connected in series;
the first impedance element is an impedance element connected to the opposite terminals of the secondary coil of the transformer or to a first potential side of the circuit associated with the secondary coil, while the second impedance element is an impedance element connected to the opposite terminals of the secondary coil or to a second potential side of the circuit associated with the secondary coil, the first potential side being higher than the second potential side;
the first impedance element has an impedance represented by Za and the second impedance element has an impedance represented by Zp, a second equivalent capacitance to ground on the second potential side is represented by Cp, a first equivalent capacitance to ground on the first potential side is represented by Ca, and a ratio of Za/Zp is substantially equal to a ratio of Cp/Ca.
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Accused Products
Abstract
A power transfer system includes a power transmission device and a power reception device which are capacitively coupled to allow electrical conduction therethrough in the manner of alternating current. The power transmission device includes an active electrode, a passive electrode, a step-up transformer, and a high-frequency voltage generating circuit. The power reception device includes an active electrode, a passive electrode, and a load circuit. A divider for voltage division based on load capacitances (C1 and C2) is provided between the active electrode and the passive electrode. The active electrode and the passive electrode have respective equivalent capacitances to ground (Ca and Cp) relative to the ground potential. A ground leakage current Ig is minimized by adjusting the values of the respective capacitances in an equivalent circuit so as to satisfy the relationship: C2/C1=Cp/Ca.
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Citations
12 Claims
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1. A high-frequency power device comprising:
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a transformer; a high-frequency voltage generating circuit configured to feed a high-frequency voltage to a primary coil of the transformer so that the primary coil forms an electric feeder section; and a divider configured to divide a voltage across opposite terminals of a secondary coil of the transformer or opposite terminals of an element of a circuit associated with the secondary coil at a predetermined voltage ratio, wherein; the divider is a series circuit in which a first impedance element and a second impedance element are connected in series; the first impedance element is an impedance element connected to the opposite terminals of the secondary coil of the transformer or to a first potential side of the circuit associated with the secondary coil, while the second impedance element is an impedance element connected to the opposite terminals of the secondary coil or to a second potential side of the circuit associated with the secondary coil, the first potential side being higher than the second potential side; the first impedance element has an impedance represented by Za and the second impedance element has an impedance represented by Zp, a second equivalent capacitance to ground on the second potential side is represented by Cp, a first equivalent capacitance to ground on the first potential side is represented by Ca, and a ratio of Za/Zp is substantially equal to a ratio of Cp/Ca. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification