POWER TRANSMISSION SYSTEM
First Claim
1. A power transmission apparatus for wirelessly transmitting power to a power receiving apparatus that includes at least one receiving-side coupling component, a receiving-side resonance circuit, and an output circuit configured to convert a voltage induced by the at least one receiving-side coupling component into a voltage of a predetermined value and output the converted voltage to a load, the power transmission apparatus, comprising:
- at least one transmission-side coupling component;
a transmission-side resonance circuit that is coupled to the at least one transmission-side coupling component or that includes the at least one transmission-side coupling component;
a power conversion circuit configured to convert a direct voltage into an alternating voltage and output the alternating voltage to the transmission-side resonance circuit; and
a controller that sets an output power of the power conversion circuit, the controller being configured to;
set a frequency of the alternating voltage to a frequency determined based on a resonance frequency of the transmission-side resonance circuit and a resonance frequency of the receiving-side resonance circuit,change the output power of the power conversion circuit at the set frequency of the alternating voltage,detect an input power of the power conversion circuit upon a detected change of the output power of the power conversion circuit,determine a minimum value of the input power, andset the output power of the power conversion circuit based on the determined input power having the minimum value,wherein the power transmission apparatus wirelessly transmits power to the power receiving apparatus by one of electric field coupling and magnetic field coupling between the transmission-side coupling components and the receiving-side coupling components.
1 Assignment
0 Petitions
Accused Products
Abstract
A power transmission system is disclosed in which power is transmitted from a power transmission apparatus to a power receiving apparatus by electric field coupling between active and passive electrodes. The power transmission apparatus includes a step-up/down circuit for stepping up or down a direct voltage and an inverter circuit for converting the direct voltage into an alternating voltage that is output to the active and passive electrodes. The power transmission apparatus controls the step-up/down circuit to sweep a transformation ratio M=Vo1/Vin and detects the ratio M when an input power Pin of the step-up/down circuit is a minimum. The power transmission apparatus drives the step-up/down circuit to obtain the ratio M and perform the power transmission. As a result, there is provided a power transmission system capable of efficiently performing power transmission regardless of the change in a load in the power receiving apparatus.
11 Citations
20 Claims
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1. A power transmission apparatus for wirelessly transmitting power to a power receiving apparatus that includes at least one receiving-side coupling component, a receiving-side resonance circuit, and an output circuit configured to convert a voltage induced by the at least one receiving-side coupling component into a voltage of a predetermined value and output the converted voltage to a load, the power transmission apparatus, comprising:
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at least one transmission-side coupling component; a transmission-side resonance circuit that is coupled to the at least one transmission-side coupling component or that includes the at least one transmission-side coupling component; a power conversion circuit configured to convert a direct voltage into an alternating voltage and output the alternating voltage to the transmission-side resonance circuit; and a controller that sets an output power of the power conversion circuit, the controller being configured to; set a frequency of the alternating voltage to a frequency determined based on a resonance frequency of the transmission-side resonance circuit and a resonance frequency of the receiving-side resonance circuit, change the output power of the power conversion circuit at the set frequency of the alternating voltage, detect an input power of the power conversion circuit upon a detected change of the output power of the power conversion circuit, determine a minimum value of the input power, and set the output power of the power conversion circuit based on the determined input power having the minimum value, wherein the power transmission apparatus wirelessly transmits power to the power receiving apparatus by one of electric field coupling and magnetic field coupling between the transmission-side coupling components and the receiving-side coupling components. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power transmission system comprising:
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a power transmitting apparatus including; at least one transmission-side coupling component, a transmission-side resonance circuit that is coupled to or that includes the at least one transmission-side coupling component, and a power conversion circuit configured to convert a direct voltage into an alternating voltage and output the alternating voltage to the transmission-side resonance circuit; and a power receiving apparatus including; at least one receiving-side coupling component, a receiving-side resonance circuit that is coupled to or that includes the at least one receiving-side coupling component and that is configured to resonate at the same resonance frequency as the transmission-side resonance circuit of the power transmitting apparatus, an output circuit configured to convert a voltage induced by the receiving-side coupling components into a voltage of a predetermined value and output the converted voltage to a load, wherein the power transmission apparatus further comprises a controller that sets an output power of the power conversion circuit, the controller being configured to; set a frequency of the alternating voltage to a frequency determined based on a resonance frequency of the transmission-side resonance circuit and a resonance frequency of the receiving-side resonance circuit, change the output power of the power conversion circuit at the set frequency of the alternating voltage, detect an input power of the power conversion circuit upon a detected change of the output power of the power conversion circuit, determine a minimum value of the input power, and set the output power of the power conversion circuit based on the determined input power having the minimum value, wherein the power transmission apparatus wirelessly transmits power to the power receiving apparatus by one of electric field coupling and magnetic field coupling between the transmission-side coupling components and the receiving-side coupling components. - View Dependent Claims (10, 11)
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12. A method for wirelessly transmitting power from a power transmission apparatus to a power receiving apparatus, where the power transmission apparatus includes at least one transmission-side coupling component, a transmission-side resonance circuit, and a power conversion circuit that converts a direct voltage into an alternating voltage and outputs the alternating voltage to the transmission-side resonance circuit, and the power receiving apparatus includes at least one receiving-side coupling component, a receiving-side resonance circuit, and an output circuit that converts a voltage induced by the receiving-side coupling components into a voltage of a predetermined value and outputs the converted voltage to a load, the power transmission apparatus, the method comprising:
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setting a frequency of the alternating voltage to a frequency determined based on a resonance frequency of the transmission-side resonance circuit and a resonance frequency of the receiving-side resonance circuit; changing an output power of the power conversion circuit at the set frequency of the alternating voltage; detecting an input power of the power conversion circuit upon a detected change of the output power of the power conversion circuit; determining a minimum value of the input power; and setting the output power of the power conversion circuit based on the determined input power having the minimum value. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification