Coil-Surrounded Circuitry Field Cancellation With a Balancing Inductor
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Solution Overview
Problem
Conventional methods for shielding coil-surrounded circuitry in compact devices, such as those used in healthcare and IoT applications, often require additional timing control circuitry and increase device size and cost, and do not effectively address field interference from wireless power transfer and RF signals.
Innovation Solution
A field cancellation system using a balancing inductor electrically-coupled to a cancellation coil, aligned to minimize interference with primary and cancellation fields, allowing for synchronized operation without separate driver signals, and enabling localized field cancellation within the coil-surrounded volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional shielding methods are used for coil-surrounded circuitry, then field interference is reduced, but device size and complexity increase due to additional timing control circuitry
Solution Approach 1:
The patent extracts the timing control function from separate circuitry and integrates it into the driver signal itself. The driver signal is modulated to contain timing information that directly controls the cancellation coil operation, eliminating the need for additional dedicated timing control components and reducing overall device complexity.
Solution Approach 2:
The patent combines the driver signal for the primary coil with timing control information into a single integrated signal structure. This merged signal simultaneously drives the primary coil and provides timing cues for the cancellation coil activation, reducing the number of separate control circuits needed.
2Object-affected harmful factors
If conventional shielding methods are used for coil-surrounded circuitry, then field interference is reduced, but device cost increases
Solution Approach 1:
The patent removes the need for expensive separate timing control circuitry by extracting the timing function and embedding it within the existing driver signal architecture. This approach maintains field interference protection while significantly reducing bill of materials costs and manufacturing complexity.
Solution Approach 2:
The driver signal serves dual purposes: it drives the primary coil and simultaneously provides timing control information for the cancellation coil. This self-service approach eliminates the need for separate control circuits, reducing both component costs and assembly complexity.
3Object-affected harmful factors
If circuitry is relocated outside the coil volume, then field interference is minimized, but device volume increases
Solution Approach 1:
The patent applies preliminary anti-action by using the cancellation coil to generate opposing magnetic fields that preemptively counteract the harmful effects of the primary coil's field on the circuitry. This allows the circuitry to remain within the coil volume without suffering from field interference, maintaining compact device dimensions.
Solution Approach 2:
The patent creates a localized protected zone within the coil volume by applying cancellation fields specifically targeted at the circuitry location. This local quality approach allows selective field cancellation only where needed, preserving the compact integrated layout while protecting sensitive components.
4Manufacturing precision
If separate driver signals are used for primary and cancellation coils, then field cancellation precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the driver signal functionality to serve both the primary coil and the cancellation coil through a single integrated signal path. The signal contains embedded timing information that enables precise control of the cancellation coil while eliminating the need for separate driver circuits, maintaining precision without increasing complexity.
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
Reduces device size and cost by optimizing field cancellation within the coil-surrounded volume, maintaining efficient power and signal transfer while protecting sensitive circuitry from interference.
Implementation Method 1
a cancellation coil within the first volume, the cancellation coil configured to, when driven by the driver signal, generate a cancellation field to cancel at least a portion of a field strength within a second volume surrounded by the cancellation coil
Implementation Method 2
a balancing inductor electrically-coupled to the cancellation coil, the balancing inductor configured to control a balance between the primary field and the cancellation field
Data Source
AI summary
A field cancellation device includes a primary coil and a cancellation coil. The primary coil surrounds a primary volume. The cancellation coil is disposed at least in part within the primary volume. Upon simultaneous incidence of an input signal on both coils, the primary coil and the cancellation coil each generate a response to the signal input. The cancellation field associated with the response from the cancellation coil may cancel a portion of the field power in a protected volume, which is the part of the primary volume surrounded by the cancellation coil. The field cancellation device further includes a balancing inductor that controls the balance between the responses generated by the respective coils.