Wireless power transfer system for wirelessly transferring electric power in noncontact manner by utilizing resonant magnetic field coupling
First Claim
1. A frequency controller apparatus for use in a wireless power transmitter apparatus configured to wirelessly transmit an inputted power from a power transmitting antenna including a first resonant circuit, toward a power receiving antenna that includes a second resonant circuit and is electromagnetically coupled to the power transmitting antenna at a predetermined transmission frequency, the frequency controller apparatus comprising:
- a controller configured to change the transmission frequency during a power transfer,wherein the controller increases the transmission frequency upon sweeping the transmission frequency without decreasing the transmission frequency,wherein every time when the transmission frequency is increased in steps from a predetermined minimum frequency to a predetermined maximum frequency upon sweeping the transmission frequency, the controller (i) measures, as a predetermined power transfer characteristic, an output voltage and an output current outputted to a load and (ii) stores the measured output voltage and the measured output current into a storage unit,wherein the controller controls the power transfer to stop the power transfer after sweeping the transmission frequency, the controller retrieves a transmission frequency corresponding to the measured output voltage and the measured output current when the output voltage and the output current become a predetermined voltage and current from among the measured output voltages and the measured output currents stored in the storage unit, andwherein the controller starts the power transfer at the retrieved transmission frequency.
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Abstract
There is provided a frequency controller apparatus for use in a wireless power transmitter apparatus configured to wirelessly transmit an inputted power from a power transmitting antenna that includes a first resonant circuit, toward a power receiving antenna that includes a second resonant circuit and is electromagnetically coupled to the power transmitting antenna at a predetermined transmission frequency. The frequency controller apparatus includes a controller for changing the transmission frequency during a power transfer, and the controller sets a decrease amount when decreasing the transmission frequency, so that the decrease amount is smaller than an increase amount when the transmission frequency is increased.
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Citations
10 Claims
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1. A frequency controller apparatus for use in a wireless power transmitter apparatus configured to wirelessly transmit an inputted power from a power transmitting antenna including a first resonant circuit, toward a power receiving antenna that includes a second resonant circuit and is electromagnetically coupled to the power transmitting antenna at a predetermined transmission frequency, the frequency controller apparatus comprising:
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a controller configured to change the transmission frequency during a power transfer, wherein the controller increases the transmission frequency upon sweeping the transmission frequency without decreasing the transmission frequency, wherein every time when the transmission frequency is increased in steps from a predetermined minimum frequency to a predetermined maximum frequency upon sweeping the transmission frequency, the controller (i) measures, as a predetermined power transfer characteristic, an output voltage and an output current outputted to a load and (ii) stores the measured output voltage and the measured output current into a storage unit, wherein the controller controls the power transfer to stop the power transfer after sweeping the transmission frequency, the controller retrieves a transmission frequency corresponding to the measured output voltage and the measured output current when the output voltage and the output current become a predetermined voltage and current from among the measured output voltages and the measured output currents stored in the storage unit, and wherein the controller starts the power transfer at the retrieved transmission frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power transfer method for use in a wireless power transmitter apparatus configured to wirelessly transmit an inputted power from a power transmitting antenna including a first resonant circuit, toward a power receiving antenna that includes a second resonant circuit and is electromagnetically coupled to the power transmitting antenna at a predetermined transmission frequency, the power transfer method comprising:
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a control step of changing the transmission frequency during a power transfer, wherein the control step includes a step of increasing the transmission frequency upon sweeping the transmission frequency without decreasing the transmission frequency, wherein in the control step, every time when the transmission frequency is increased in steps from a predetermined minimum frequency to a predetermined maximum frequency upon sweeping the transmission frequency, the control step includes (i) a step of measuring, as a predetermined power transfer characteristic, an output voltage and an output current outputted to a load and (ii) a step of storing the measured output voltage and the measured output current into a storage unit, wherein the control step includes a step of controlling the power transfer to stop the power transfer after sweeping the transmission frequency, the control step includes a step of retrieving a transmission frequency corresponding to the measured output voltage and the measured output current when the output voltage and the output current become a predetermined voltage and current from among the measured output voltages and the measured output currents stored in the storage unit, and wherein the control step includes a step of starting the power transfer at the retrieved transmission frequency. - View Dependent Claims (10)
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Specification