Inductive Transmitter Interference Mitigation via Phase and Orientation Control

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Solution Overview

Problem

Inductive systems operating in close proximity often experience interference, leading to decreased efficiency, malfunctions, and user annoyance due to vibrations or noise, particularly in devices that charge wirelessly.

Innovation Solution

The systems mitigate interference by adjusting operations, coordinating phase, mimicking communication signals, and optimizing physical positioning of transmitters, such as orienting them orthogonally to reduce coupling and flux interaction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple inductive systems operate in close proximity, then power transfer and data communication capabilities are enhanced, but interference between systems increases causing malfunctions and user annoyance

Engineering Contradiction:

Improvecapability to support multiple inductive systemsVSAvoidinterference between systems

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies periodic action by operating multiple inductive transmitters at different time intervals or duty cycles. The controller coordinates the activation periods of each transmitter so that they do not operate simultaneously, thereby reducing interference while maintaining the capability to support multiple inductive systems for both power and data transfer.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent employs parameter changes by adjusting operating frequency, power level, or modulation characteristics of the inductive transmitters based on detected interference conditions. The controller monitors system performance and dynamically modifies transmission parameters to minimize interference between co-located inductive systems while preserving their functional capabilities.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If inductive systems operate simultaneously, then system efficiency decreases due to interference, but continuous operation is required to maintain functionality

Engineering Contradiction:

Improvesystem efficiencyVSAvoidcontinuous operation requirement

Core Design Contradiction:

ProductivityVSDuration of action of stationary object

Solution Approach 1:

The controller implements periodic action by scheduling alternating operation periods for multiple inductive systems. During each period, one system operates while others are dormant, then roles are swapped. This maintains continuous overall functionality while eliminating simultaneous operation that causes interference, thereby preserving system efficiency.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies dynamics by making the operational state of each inductive transmitter variable and adaptive rather than static. The controller dynamically switches which system is active based on real-time conditions, allowing the system to maintain continuous service while optimizing efficiency by preventing interference through dynamic coordination.

Inventive Principle:

Principle #15Dynamics

3Area of stationary object

If transmitters are positioned closer together, then space utilization is improved, but magnetic field coupling and flux interaction increase causing interference

Engineering Contradiction:

Improvespace utilizationVSAvoidmagnetic field coupling

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by orienting the magnetic fields of adjacent inductive transmitters in different spatial directions (e.g., orthogonal orientations). This creates localized field patterns that minimize overlapping and coupling between systems, allowing closer positioning without proportionally increasing interference. Each transmitter's field is configured to have minimal impact on neighboring systems.

Inventive Principle:

Principle #3Local quality

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 approach effectively reduces interference between inductive systems, maintaining efficient power transfer and data communication without interrupting operations, thus enhancing user experience by minimizing unwanted vibrations and noise.

Implementation Method 1

Inductive systems that operate in close proximity can cause interference with one another

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

the transmitter for the first inductive sub-system and the transmitter for the second inductive sub-system are oriented approximately orthogonal to one another in order to reduce interference between them

Methodology Applied

Scientific EffectMagnetic field coupling: Electromagnetic Induction

Data Source

PatentUS9344155B2Interference mitigation for multiple inductive systems

Publication Date: 2016.05.17 PHILIPS IP VENTURES BV

AI summary

A system and method for mitigating interference between two or more inductive systems. Interference can be mitigated by, in response to an interference causing event, temporarily adjusting operation of one or more of the inductive sub-systems to reduce interference. A controller can receives communication from multiple inductive systems and instruct the systems to operate so as to reduce interference. The inductive systems can coordinate to operate out of phase with respect to one another to reduce interference. Communication from a data transfer inductive system can be mimicked by another inductive system so that both systems transmit the communication. Interference between multiple inductive systems can be mitigated by specific physical positioning of the transmitters of the inductive sub-systems.