OVERVOLTAGE PROTECTION CIRCUIT, POWER TRANSMISSION DEVICE INCLUDING THE SAME, AND CONTROL METHOD THEREOF
First Claim
1. An overvoltage protection circuit in a power transmission device, comprising:
- a detection unit configured to detect a first current flowing from an input terminal to an output terminal and an input voltage applied to the input terminal to generate a control signal; and
a current control unit configured to control a second current flowing from the input terminal to a ground in response to the control signal so that a ratio of the input voltage to an input current inputted through the input terminal is kept constant.
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Accused Products
Abstract
Provided is a power transmission device including a transmission unit and a reception unit. The reception unit includes an overvoltage protection circuit and provides a feedback signal to the transmission unit. The transmission unit controls intensity of power wirelessly transmitted to the reception unit with reference to the feedback signal to control power consumption of the overvoltage protection circuit. The overvoltage protection circuit includes a detection unit and a current control unit. The detection unit detects an input voltage and a first current to generate a control signal. The current control unit controls a second current with reference to the control signal. Herein, the second current is controlled so that a ratio of the input voltage to a sum of the first and second currents is kept constant.
33 Citations
18 Claims
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1. An overvoltage protection circuit in a power transmission device, comprising:
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a detection unit configured to detect a first current flowing from an input terminal to an output terminal and an input voltage applied to the input terminal to generate a control signal; and a current control unit configured to control a second current flowing from the input terminal to a ground in response to the control signal so that a ratio of the input voltage to an input current inputted through the input terminal is kept constant. - View Dependent Claims (2, 3, 4)
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5. A power transmission device comprising:
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a reception unit comprising an overvoltage protection circuit; and a transmission unit configured to wirelessly transmit power to the reception unit, wherein the transmission unit controls power consumption of the overvoltage protection circuit by controlling intensity of the power transmitted with reference to a feedback signal provided from the reception unit. - View Dependent Claims (6, 7)
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8. The power transmission device of claim 8, wherein the reception unit comprises:
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a direct current (DC) converter configured to transform power outputted from the overvoltage protection circuit and provide the transformed power to a load; and a feedback control unit configured to receive a detection signal from the overvoltage protection circuit, and provide the detection signal as the feedback signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for controlling a power transmission device comprising a reception unit provided with an overvoltage protection circuit, comprising:
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detecting a first current which flows from an input terminal of the overvoltage protection circuit to an output terminal thereof; detecting an input voltage applied to the input terminal; and controlling a second current which flows from the input terminal to a ground with reference to the first current and the input voltage so that a ratio of the input voltage to an input current inputted through the input terminal is kept constant. - View Dependent Claims (17, 18)
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Specification