Wirelessly powered devices
First Claim
Patent Images
1. A circuit for delivering power to a load and from a wireless power supply, comprising:
- an inductor coil configured to couple to an electromagnetic field of another inductor coil of the wireless power supply;
a rectifier configured to rectify power from the inductor coil of the circuit a switchable capacitor bank configured to store the rectified power in capacitors switchable at least between a series and a parallel configuration;
a voltage detecting device including circuitry configured to measure voltages or detect predetermined voltages, across the capacitor bank;
a switch controller including circuitry configured to control the capacitor bank switching in dependence on the measured or detected voltages; and
a voltage regulator configured to supply the load with a constant voltage power supply derived from the voltages across the capacitor bank.
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Abstract
A circuit for delivering power to a load from a wireless power supply comprises an inductor coil for placing in the electromagnetic field of an inductor coil of a supply and a switchable capacitor bank with capacitors switchable at least between a series and a parallel configuration. The voltage across the capacitor bank is used as a feedback control parameter for controlling the capacitor bank switching. A voltage regulator is used to supply the load with a constant voltage power supply derived from the capacitor bank output.
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Citations
17 Claims
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1. A circuit for delivering power to a load and from a wireless power supply, comprising:
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an inductor coil configured to couple to an electromagnetic field of another inductor coil of the wireless power supply; a rectifier configured to rectify power from the inductor coil of the circuit a switchable capacitor bank configured to store the rectified power in capacitors switchable at least between a series and a parallel configuration; a voltage detecting device including circuitry configured to measure voltages or detect predetermined voltages, across the capacitor bank; a switch controller including circuitry configured to control the capacitor bank switching in dependence on the measured or detected voltages; and a voltage regulator configured to supply the load with a constant voltage power supply derived from the voltages across the capacitor bank. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for delivering power to a load from a wireless power supply, comprising:
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placing an inductor in the electromagnetic field of an inductor coil of a supply; storing power received from the inductor in a capacitor bank; measuring the voltage or detecting predetermined received voltages across the capacitor bank; controlling switching of capacitors in the capacitor bank at least between a series and a parallel configuration in dependence on the measured or detected voltages; and supplying a load with a constant voltage power supply derived from the voltage across the capacitor bank and by a voltage regulator. - View Dependent Claims (8, 9, 10)
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11. A system containing circuitry with operational requirements that define a minimum and maximum voltage, the system comprising:
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an energy trapping circuit including an inductor and a rectifying circuit configured to receive energy from a remote transmitting coil and to produce a rectified output from the received energy; a capacitor bank configured to store power from the rectified output, the capacitor bank including; a plurality of capacitors; and a plurality of switches configured to adjust a voltage stored across the capacitor bank by switching the plurality of capacitors between series and parallel configurations; a voltage regulator configured to produce a regulated output voltage from the voltage stored across the capacitor bank; and a switch controller circuit configured to prevent the voltage stored across the capacitor bank from decreasing below the minimum voltage by switching the plurality of capacitors from the parallel configuration to the series configuration. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification