FOREIGN OBJECT DETECTING CIRCUIT AND WIRELESS POWER TRANSMISSION DEVICE USING THE SAME
First Claim
Patent Images
1. A wireless power transmission device, comprising:
- a power amplifier configured to receive a direct current (DC) voltage and supply an alternating current (AC) power current to a transmission resonator by performing a switching operation;
a detection device configured to detect a voltage of an output terminal of the power amplifier based on the switching operation; and
a control unit configured to detect an external object based on a change in the voltage, and control an output of the power amplifier in response to the change.
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Abstract
A wireless power transmission device includes a power amplifier, a detection device, and a control unit. The power amplifier is configured to receive a direct current (DC) voltage and supply an alternating current (AC) power current to a transmission resonator by performing a switching operation. The detection device is configured to detect a voltage of an output terminal of the power amplifier based on the switching operation. The control unit is configured to detect an external object based on a change in the voltage, and control an output of the power amplifier in response to the change.
16 Citations
20 Claims
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1. A wireless power transmission device, comprising:
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a power amplifier configured to receive a direct current (DC) voltage and supply an alternating current (AC) power current to a transmission resonator by performing a switching operation; a detection device configured to detect a voltage of an output terminal of the power amplifier based on the switching operation; and a control unit configured to detect an external object based on a change in the voltage, and control an output of the power amplifier in response to the change. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A foreign object detecting circuit, applied to a wireless power transmission device, comprising:
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a power amplifier configured to receive a DC voltage and generate an AC power current by performing a switching operation of a pair of switches connected in parallel; and a detection device configured to detect a voltage between an anode output terminal and a cathode output terminal of an output terminal of the power amplifier. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A wireless power transmission device, comprising:
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a power amplifier comprising switches connected to an input terminal to supply an alternating current (AC) power current to a transmission resonator; a detection device configured to detect a voltage between an anode input terminal and a cathode input terminal of each of the switches; and a control unit configured to detect an external object based on a voltage change between an anode output terminal and a cathode output terminal of an output terminal of the power amplifier, and control an output of the power amplifier in response to the voltage change. - View Dependent Claims (18, 19, 20)
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Specification