Wireless power transmission circuit
First Claim
1. A wireless power transmission circuit comprising:
- an oscillator;
a DC-AC converter configured to convert a direct current into an alternating current in response to a periodic wave generated by the oscillator and to be turned on or off in response to a control signal;
a power transmission coil configured to transmit AC power converted by the DC-AC converter;
a signal reception coil; and
a signal receiver configured to detect a voltage change across a first terminal and a second terminal of the signal reception coil and provide the control signal based on the detected voltage change,wherein the DC-AC converter comprises;
a first transistor configured to electrically couple a first terminal of the power transmission coil to a first node in response to a bias voltage;
a second transistor configured to electrically couple a second terminal of the power transmission coil to a second node in response to the bias voltage;
a switch configured to supply a high voltage to a center terminal in response to the control signal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal;
a first pull-down driver configured to pull-down drive the first node when the periodic wave is in a first state; and
a second pull-down driver configured to pull-down drive the second node when the periodic wave is in a second state.
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Accused Products
Abstract
A wireless power transmission/reception system includes a wireless power transmission circuit and a wireless power reception circuit. The wireless power transmission circuit includes an oscillator, a DC-AC converter that converts a direct current to an alternating current and is turned on/off in response to a control signal, a power transmission coil that transmits AC power, a signal reception coil, and a signal receiver that transfers the control signal to the DC-AC converter. The wireless power reception circuit includes a power reception coil, a rectifier that converts an alternating current to a direct current and is turned on or off in response to the control signal, an control signal generator that generates the control signal, a signal transmission coil, and a signal transmitter that transmits the control signal through the signal transmission coil.
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Citations
9 Claims
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1. A wireless power transmission circuit comprising:
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an oscillator; a DC-AC converter configured to convert a direct current into an alternating current in response to a periodic wave generated by the oscillator and to be turned on or off in response to a control signal; a power transmission coil configured to transmit AC power converted by the DC-AC converter; a signal reception coil; and a signal receiver configured to detect a voltage change across a first terminal and a second terminal of the signal reception coil and provide the control signal based on the detected voltage change, wherein the DC-AC converter comprises; a first transistor configured to electrically couple a first terminal of the power transmission coil to a first node in response to a bias voltage; a second transistor configured to electrically couple a second terminal of the power transmission coil to a second node in response to the bias voltage; a switch configured to supply a high voltage to a center terminal in response to the control signal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal; a first pull-down driver configured to pull-down drive the first node when the periodic wave is in a first state; and a second pull-down driver configured to pull-down drive the second node when the periodic wave is in a second state. - View Dependent Claims (2, 3)
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4. A wireless power transmission circuit comprising:
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an oscillator; a DC-AC converter configured to convert a direct current into an alternating current in response to a periodic wave generated by the oscillator and to be turned on or off in response to a control signal; a power transmission coil configured to transmit AC power converted by the DC-AC converter; a signal reception coil; and a signal receiver configured to detect a voltage change across a first terminal and a second terminal of the signal reception coil and provide the control signal based on the detected voltage change, wherein the DC-AC converter comprises; a first transistor configured to electrically couple a first terminal of the power transmission coil to a first node in response to a bias voltage; a second transistor configured to electrically couple a second terminal of the power transmission coil to a second node in response to the bias voltage; a high voltage terminal configured to supply a high voltage to a center terminal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal; a bias voltage generator configured to generate the bias voltage in response to the control signal; a first pull-down driver configured to pull-down drive the first node when the periodic wave is in a first state; and a second pull-down driver configured to pull-down drive the second node when the periodic wave is in a second state. - View Dependent Claims (5)
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6. A wireless power transmission/reception system comprising:
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a wireless power transmission circuit comprising; an oscillator; a DC-AC converter configured to convert a direct current into an alternating current in response to a periodic wave generated by the oscillator and to be turned on or off in response to a control signal; a power transmission coil configured to transmit AC power converted by the DC-AC converter; a signal reception coil; and a signal receiver configured to detect a voltage change across the signal reception coil and provide the control signal based on the detected voltage change, wherein the DC-AC converter comprises; a first transistor configured to electrically couple a first terminal of the power transmission coil to a first node in response to a bias voltage, a second transistor configured to electrically couple a second terminal of the power transmission coil to a second node in response to the bias voltage, a switch configured to supply a high voltage to a center terminal in response to the control signal, the center terminal being electrically coupled to the power transmission coil between the first terminal and the second terminal, a first pull-down driver configured to pull-down drive the first node when the periodic wave is in a first state, and a second pull-down driver configured to pull-down drive the second node when the periodic wave is in a second state; and a wireless power reception circuit comprising; a power reception coil; a rectifier configured to convert an alternating current received through the power reception coil into a direct current and to be turned on or off in response to the control signal; a control signal generator configured to generate the control signal indicating whether a level of a direct voltage converted by the rectifier is higher than a reference voltage; a signal transmission coil; and a signal transmitter configured to transmit the control signal through the signal transmission coil. - View Dependent Claims (7, 8, 9)
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Specification