WIRELESS POWER SYSTEM COMPRISING POWER TRANSMITTER AND POWER RECEIVER AND METHOD FOR RECEIVING AND TRANSMITTING POWER OF THE APPARATUSES
First Claim
1. A transmitter in a wireless power transmission system, the transmitter comprising:
- a Transmission (Tx) power converter for converting a Direct Current (DC) voltage into a first Alternating Current (AC) voltage, and converting the converted first AC voltage into a second AC voltage by amplifying the converted first AC voltage;
a Tx matching circuit for matching an impedance thereof with that of a receiver for receiving the second AC voltage to transmit the second AC voltage;
a Tx resonator for resonating the second AC voltage into resonant waves to transmit the second AC voltage to the receiver; and
a Tx controller for determining an amplification rate of the first AC voltage and controlling the Tx power converter to convert the first AC voltage into the second AC voltage according to the determined amplification rate.
1 Assignment
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Accused Products
Abstract
Provided is a transmitter in a wireless power transmission system, the transmitter including a Transmission (Tx) power converter for converting a Direct Current (DC) voltage into a first Alternating Current (AC) voltage, and converting the converted first AC voltage into a second AC voltage by amplifying the converted first AC voltage, a Tx matching circuit for matching an impedance thereof with that of a receiver for receiving the second AC voltage to transmit the second AC voltage, a Tx resonator for resonating the second AC voltage into resonant waves to transmit the second AC voltage to the receiver, and a Tx controller for determining an amplification rate of the first AC voltage and controlling the Tx power converter to convert the first AC voltage into the second AC voltage according to the determined amplification rate.
215 Citations
7 Claims
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1. A transmitter in a wireless power transmission system, the transmitter comprising:
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a Transmission (Tx) power converter for converting a Direct Current (DC) voltage into a first Alternating Current (AC) voltage, and converting the converted first AC voltage into a second AC voltage by amplifying the converted first AC voltage; a Tx matching circuit for matching an impedance thereof with that of a receiver for receiving the second AC voltage to transmit the second AC voltage; a Tx resonator for resonating the second AC voltage into resonant waves to transmit the second AC voltage to the receiver; and a Tx controller for determining an amplification rate of the first AC voltage and controlling the Tx power converter to convert the first AC voltage into the second AC voltage according to the determined amplification rate.
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2. A receiver in a wireless power transmission system, the receiver comprising:
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a Reception (Rx) resonator for receiving an Alternating Current (AC) voltage resonated as resonant waves by a transmitter; an Rx matching circuit for matching an impedance thereof with that of the transmitter to receive the AC voltage from the transmitter; an Rx power converter for rectifying the AC voltage into a first Direct Current (DC) voltage, and converting the first DC voltage into a second DC voltage by amplifying the first DC voltage; and an Rx controller for determining an amplification rate of the first DC voltage and controlling the Rx power converter to convert the first DC voltage into the second DC voltage according to the determined amplification rate.
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3. A transmitter in a wireless power transmission system, the transmitter comprising:
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a Transmission (Tx) power converter comprising a Class-E amplifier for converting a Direct Current (DC) voltage into a first Alternating Current (AC) voltage and a driver amplifier for converting the converted first AC voltage into a second AC voltage by amplifying the converted first AC voltage; a Tx matching circuit for matching an impedance thereof with that of a receiver for receiving the second AC voltage to transmit the second AC voltage; a Tx resonator for resonating the second AC voltage into resonant waves to transmit the second AC voltage to the receiver; and a Tx controller for determining an amplification rate of the first AC voltage and controlling the Tx power converter to convert the first AC voltage into the second AC voltage according to the determined amplification rate, wherein the Tx controller monitors a driving voltage of a transistor included in the Class-E amplifier to determine whether at least one of an over-voltage, an over-current, and an over-temperature occurs in the Class-E amplifier due to the driving voltage applied to the transistor, and stops an operation of the transmitter if at least one of the over-voltage, the over-current, and the over-temperature occurs.
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4. A receiver in a wireless power transmission system, the receiver comprising:
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a Reception (Rx) resonator for receiving an Alternating Current (AC) voltage resonated as resonant waves by a transmitter; an Rx matching circuit for matching an impedance thereof with that of the transmitter to receive the AC voltage from the transmitter; an Rx power converter for rectifying the AC voltage into a first Direct Current (DC) voltage, and converting the first DC voltage into a second DC voltage by amplifying the first DC voltage; and an Rx controller for determining an amplification rate of the first DC voltage and controlling the Rx power converter to convert the first DC voltage into the second DC voltage according to the determined amplification rate, wherein the Rx controller monitors the AC voltage received through the Rx resonator to determine whether at least one of an over-voltage, an over-current, and an over-temperature occurs in at least a part of the receiver, and stops an operation of the receiver if at least one of the over-voltage, the over-current, and the over-temperature occurs.
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5. A wireless power transmission and reception method for a transmitter in a wireless power transmission system, the wireless power transmission and reception method comprising:
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a detection step of, to monitor a load variation in an interface, supplying a first power every predetermined time and checking if the load variation occurs; a registration step of, if the load variation occurs, supplying a second power larger than the first power to the interface, and if receiving a response from a receiver having received the second power, allocating to the receiver a Short Identification (SID) and a time slot corresponding to the receiver; a configuration step of receiving information comprising at least one of an output voltage and an output current from the receiver, calculating a required power required from the receiver according to the information, and determining whether the required power can be transmitted to the receiver; and a charge step of, if the required power can be transmitted to the receiver, transmitting the required power to the receiver.
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6. A wireless power transmission and reception method for a receiver in a wireless power transmission system, the wireless power transmission and reception method comprising:
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receiving a first power supplied every predetermined time from a transmitter and requesting joining from the transmitter by using the first power; receiving a second power larger than the first power from the transmitter and requesting charging from the transmitter; being allocated with a Short Identification (SID) and a time slot from the transmitter and transmitting information comprising at least one of an output voltage and an output current to the transmitter to request transmission of a required power; and receiving the required power from the transmitter.
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7. A transmitter and a receiver in a wireless power transmission system, wherein the transmitter and the receiver transmit and receive data by using a Medium Access Control (MAC) frame comprising a MAC frame header, a frame payload, and a checksum.
Specification