Electromagnetic interference suppression
First Claim
1. An electrical conduit configured to convey power conductively by way of a current from a power source to a field generator of an inductive power transmitter, the field generator being operable to generate a fluctuating electromagnetic field having a fundamental frequency for transmitting electrical power to a device by electromagnetic induction, the conduit comprising:
- at least one impedance element connected along an electrical path of the conduit configured to carry said current, the at least one impedance element having a high enough impedance at the fundamental frequency such that, in use, electromagnetic noise experienced at the power source is substantially suppressed, such electromagnetic noise arising from coupling between the electromagnetic field and a circuit having said path and linking the power source to the transmitter, wherein the at least one impedance element includes first and second inductors, wherein a voltage induced by the field generator in the first inductor opposes a voltage induced by the field generator in the second inductor.
1 Assignment
0 Petitions
Accused Products
Abstract
An inductive power transmitter for transmitting electrical power to a device by electromagnetic induction, the transmitter being configured to receive power conductively by way of a current via an electrical conduit from an external power source, the transmitter including a field generator configured to generate a fluctuating electromagnetic field having a fundamental frequency; and at least one impedance element connected along an electrical path of the transmitter configured to carry said current, the impedance element or a combination of the impedance elements having a high enough impedance at the fundamental frequency such that, in use, electromagnetic noise experienced at the power source is substantially suppressed, such noise arising from coupling between the electromagnetic field and a circuit having said path and linking the power source to the transmitter.
17 Citations
20 Claims
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1. An electrical conduit configured to convey power conductively by way of a current from a power source to a field generator of an inductive power transmitter, the field generator being operable to generate a fluctuating electromagnetic field having a fundamental frequency for transmitting electrical power to a device by electromagnetic induction, the conduit comprising:
at least one impedance element connected along an electrical path of the conduit configured to carry said current, the at least one impedance element having a high enough impedance at the fundamental frequency such that, in use, electromagnetic noise experienced at the power source is substantially suppressed, such electromagnetic noise arising from coupling between the electromagnetic field and a circuit having said path and linking the power source to the transmitter, wherein the at least one impedance element includes first and second inductors, wherein a voltage induced by the field generator in the first inductor opposes a voltage induced by the field generator in the second inductor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electrical conduit for electrical connection between a mains supply and an inductive power transmitter, the electrical conduit comprising:
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an electrical path adapted to convey power from the mains supply to the inductive power transmitter; and an impedance element in the electrical path, the impedance element including first and second inductors, wherein a voltage induced by the inductive power transmitter in the first inductor opposes a voltage induced by the inductive power transmitter in the second inductor, and wherein the impedance element includes an impedance such that a back conduction of electromagnetic noise from the inductive power transmitter to the mains supply is suppressed. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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16. Equipment for use in the vicinity of an inductive power transmitter, the transmitter being configured to transmit electrical power to a device by electromagnetic induction and comprising a field generator configured to generate a fluctuating electromagnetic field and having a fundamental frequency, the equipment being configured to receive power conductively by way of a current via an electrical conduit from an external power source, the equipment comprising:
an impedance element connected along an electrical path of the equipment configured to carry said current, the impedance element having a high enough impedance at the fundamental frequency such that, in use, electromagnetic noise experienced at the power source is substantially suppressed, such noise arising from coupling between the electromagnetic field and a circuit having said path and linking the power source to the equipment, wherein the impedance element includes first and second inductors, and wherein a voltage induced by the field generator in the first inductor opposes a voltage induced by the field generator in the second inductor. - View Dependent Claims (17, 18, 19, 20)
Specification