Contactless power reception circuit and contactless power transmission system
First Claim
1. A contactless power reception circuit, comprising:
- a power reception part couplable with an adjacent electromagnetic field of a contactless power transmission circuit;
a voltage rectifying part configured to rectify a voltage from the power reception part;
a voltage transforming part configured to transform rectified voltage from the voltage rectifying part and supply the transformed voltage to a power reception load; and
a load modulation part configured to change total impedance in the contactless power reception circuit by conducting load modulation while signals are transmitted to the contactless power transmission circuit, whereinthe voltage transforming part includes a DCDC converter that transforms rectified voltage from the voltage rectifying part, a smoothing capacitor that smoothes the rectified voltage, and a backflow preventing device configured to prevent backflow of charge from the smoothing capacitor while the signals are transmitted.
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Accused Products
Abstract
This disclosure provides a contactless power reception circuit that includes a power reception part, a voltage rectifying part, a voltage transforming part and a load modulation part. The voltage transforming part includes a smoothing capacitor, a DCDC converter and a backflow prevention device. The power reception part is couplable with an electromagnetic field adjacent to the contactless power reception circuit. The rectifying part rectifies a voltage output from the power reception part, the voltage transforming part transforms rectified voltage from the rectifying part, and the load modulation circuit conducts a load modulation while signals are transmitted. The smoothing capacitor smoothes a voltage input to the voltage transforming part, the DCDC converter transforms voltage smoothed by the smoothing capacitor, and the backflow prevention device prevents backflow of charge from the smoothing capacitor while the signals are transmitted to a contactless power transmission circuit.
10 Citations
18 Claims
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1. A contactless power reception circuit, comprising:
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a power reception part couplable with an adjacent electromagnetic field of a contactless power transmission circuit; a voltage rectifying part configured to rectify a voltage from the power reception part; a voltage transforming part configured to transform rectified voltage from the voltage rectifying part and supply the transformed voltage to a power reception load; and a load modulation part configured to change total impedance in the contactless power reception circuit by conducting load modulation while signals are transmitted to the contactless power transmission circuit, wherein the voltage transforming part includes a DCDC converter that transforms rectified voltage from the voltage rectifying part, a smoothing capacitor that smoothes the rectified voltage, and a backflow preventing device configured to prevent backflow of charge from the smoothing capacitor while the signals are transmitted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification
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- Resources
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Current AssigneeMurata Manufacturing Co Limited
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Original AssigneeMurata Manufacturing Co Limited
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InventorsShinoda, Satoshi, Sano, Takahide
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Primary Examiner(s)AMAYA, CARLOS DAVID
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Application NumberUS13/073,570Publication NumberTime in Patent Office1,086 DaysField of Search307/104, 320/108US Class Current307/104CPC Class CodesH02J 50/10 using inductive couplingH02J 50/80 involving the exchange of d...
