Electromagnetic interference suppression
First Claim
1. 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 comprising:
- 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 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 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.
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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.
25 Citations
14 Claims
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1. 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 comprising:
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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 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 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, 7, 8, 9, 10, 11, 12)
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13. A method of configuring an inductive power transmitter, the transmitter being for transmitting electrical power to a device by electromagnetic induction and being configured to receive power conductively via an electrical conduit by way of a current from an external power source, the transmitter comprising a field generator configured to generate a fluctuating electromagnetic field having a fundamental frequency, the method comprising:
connecting at least one impedance element along an electrical path of the transmitter configured to carry said current, the at least one impedance element including first and second inductors, 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 noise arising from coupling between the electromagnetic field and a circuit having said path and linking the power source to the transmitter, 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 (14)
Specification