Inductive power transfer system
First Claim
1. An inductive power transfer system comprising:
- a transmitter circuit comprising a transmitter coil; and
a receiver circuit comprising a receiver coil spaced from the transmitter coil,wherein the transmitter circuit is in the form of a Class E amplifier comprising;
a first inductor and a transistor in series between the terminals of a power supply, the transistor being arranged to switch at a first frequency;
a first transmitter capacitance in parallel with the transistor between the first inductor and a power supply terminal;
a primary tank circuit in parallel with the first transmitter capacitance, the primary tank circuit comprising the transmitter coil and a second transmitter capacitance arranged in parallel or series with the transmitter coil;
a third transmitter capacitance in series with the first inductor between the first transmitter capacitance and the primary tank circuit,wherein the second transmitter capacitance is selected such that a resonant frequency of the primary tank circuit is not equal to the first frequency.
3 Assignments
0 Petitions
Accused Products
Abstract
An inductive power transfer system comprises a transmitter circuit comprising a transmitter coil and a receiver circuit comprising a receiver coil spaced from the transmitter coil. The transmitter circuit is in the form of a Class E amplifier with a first inductor and a transistor in series between the terminals of a power supply. A first transmitter capacitance is in parallel with the transistor between the first inductor and a power supply terminal, a primary tank circuit in parallel with the first transmitter capacitance, the primary tank circuit comprising the transmitter coil and a second transmitter capacitance arranged in parallel with the transmitter coil, and a third transmitter capacitance in series with the first inductor between the first transmitter capacitance and the primary tank circuit. The second transmitter capacitance is selected such that a resonant frequency of the primary tank circuit is not equal to the first frequency.
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Citations
47 Claims
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1. An inductive power transfer system comprising:
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a transmitter circuit comprising a transmitter coil; and a receiver circuit comprising a receiver coil spaced from the transmitter coil, wherein the transmitter circuit is in the form of a Class E amplifier comprising; a first inductor and a transistor in series between the terminals of a power supply, the transistor being arranged to switch at a first frequency; a first transmitter capacitance in parallel with the transistor between the first inductor and a power supply terminal; a primary tank circuit in parallel with the first transmitter capacitance, the primary tank circuit comprising the transmitter coil and a second transmitter capacitance arranged in parallel or series with the transmitter coil; a third transmitter capacitance in series with the first inductor between the first transmitter capacitance and the primary tank circuit, wherein the second transmitter capacitance is selected such that a resonant frequency of the primary tank circuit is not equal to the first frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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- 25. A receiver circuit for use in an inductive power transfer system, the receiver circuit comprising a receiver coil and being in the form of a Class E rectifier comprising a first receiver capacitance arranged in parallel with a load and a secondary tank circuit in parallel with the first receiver capacitance, wherein the secondary tank circuit comprises the receiver coil and a second receiver capacitance arranged in parallel with the receiver coil, and a first diode is provided between the secondary tank circuit and the first receiver capacitance.
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35. A transmitter for use in an inductive power transfer system, the transmitter circuit comprising a transmitter coil and being in the form of a Class E amplifier comprising:
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a first inductor and a transistor in series between the terminals of a power supply, the transistor being arranged to switch at a first frequency; a first transmitter capacitance in parallel with the transistor between the first inductor and a power supply terminal; a primary tank circuit in parallel with the first transmitter capacitance, the primary tank circuit comprising the transmitter coil and a second transmitter capacitance arranged in parallel or series with the transmitter coil; a third transmitter capacitance in series with the first inductor between the first transmitter capacitance and the primary tank circuit, wherein the second transmitter capacitance is selected such that the resonant frequency of the primary tank circuit is not equal to the first frequency. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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Specification