Magnetic Field Cancellation Circuitry for Inductive Power Data Interference
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Solution Overview
Problem
Magnetic induction power transfer for medical devices, such as cochlear implants, experiences interference and degradation due to the large time-varying magnetic fields used for power transfer, affecting data communication and signal integrity.
Innovation Solution
Incorporation of cancellation circuitry that generates a magnetic field opposing the large time-varying magnetic field to reduce interference, using either passive power from a pick-up coil or active power from a separate supply, to protect low-power data transfer operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnetic induction power transfer uses large time-varying magnetic fields, then power transfer capability is improved, but data communication and signal integrity are degraded
Solution Approach 1:
The patent applies preliminary anti-action by generating a cancellation magnetic field that opposes and neutralizes the harmful time-varying magnetic field from power transfer before it can degrade data communication. The cancellation circuitry creates an equal and opposite magnetic field that destructively interferes with the interfering field, thereby protecting the data communication channel in advance.
Solution Approach 2:
The patent introduces an intermediary cancellation magnetic field that mediates between the power transfer magnetic field and the data communication signals. This intermediary field acts as a buffer that absorbs and neutralizes the harmful effects of the power transfer field, allowing both power and data operations to coexist without direct interference.
2Productivity
If magnetic induction power transfer operates simultaneously with data transfer, then system productivity is improved, but signal interference increases
Solution Approach 1:
The patent converts the harmful time-varying magnetic field from power transfer into a beneficial cancellation field. By detecting the power transfer magnetic field and generating an opposing field, the system transforms the harmful interference into a protective mechanism that enables simultaneous operation of power and data transfer channels.
Solution Approach 2:
The patent dynamically adjusts the parameters of the cancellation magnetic field (magnitude, phase, frequency) to match and counteract the power transfer magnetic field in real-time. This parameter modulation allows the cancellation field to effectively neutralize the interfering field while maintaining the ability to support simultaneous data transfer operations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively minimizes degradation of low-power operations by destructively interfering with the large time-varying magnetic fields, ensuring reliable power transfer and data communication in medical devices.
Implementation Method 1
at least one first circuit configured to generate a first time-varying magnetic field for magnetic induction power transfer to a device
Implementation Method 2
at least one second circuit configured to generate and/or receive a second time-varying magnetic field for magnetic induction data transfer to and/or from the device
Implementation Method 3
at least one third circuit configured to generate a third time-varying magnetic field in response to a time-varying electric current, the third time-varying magnetic field configured to at least partially inhibit degradation of said data transfer from the first time-varying magnetic field
Data Source
AI summary
An apparatus includes at least one first circuit configured to generate a first time-varying magnetic field for magnetic induction power transfer to a device, at least one second circuit configured to generate and/or receive a second time-varying magnetic field for magnetic induction data transfer to and/or from the device, and at least one third circuit configured to generate a third time-varying magnetic field in response to a time-varying electric current. The third time-varying magnetic field is configured to at least partially inhibit degradation of said data transfer from the first time-varying magnetic field. The apparatus further includes at least one fourth circuit configured to generate the time-varying electric current in response to a received portion of the first time-varying magnetic field.