Dynamic Frequency Management for Charging Bay EMI

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Solution Overview

Problem

In charging bays for electronic devices, the aggregated electromagnetic interference from multiple devices often exceeds regulated limits, violating FCC Part B electromagnetic interference regulations, despite individual devices complying with these standards.

Innovation Solution

The system dynamically alters the operating frequencies of electronic devices in the charging unit to unique predetermined frequencies, either randomly or based on assigned network addresses, minimizing combined electromagnetic interference below legal limits without the need for additional shielding components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple electronic devices are placed in a charging bay for charging or data transfer, then charging capacity and data transfer capability are improved, but the aggregated electromagnetic interference exceeds regulated legal limits

Engineering Contradiction:

Improvecharging capacityVSAvoidelectromagnetic interference

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent dynamically changes the operating frequency parameter of electronic devices in the charging bay. By assigning different frequency offsets to each device, the system maintains charging functionality while spreading electromagnetic emissions across different frequencies, preventing aggregation at a single frequency and thus complying with FCC Part B limits.

Inventive Principle:

Principle #35Parameter changes

2Object-generated harmful factors

If traditional shielding solutions are implemented to reduce electromagnetic interference, then electromagnetic interference is reduced, but product cost and manufacturing complexity increase

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent replaces physical shielding mechanisms (mechanical/electrical components) with a software-based frequency management system. Instead of adding hardware layers and shielding components, the system uses dynamic frequency assignment algorithms to manage electromagnetic interference, significantly reducing manufacturing complexity and cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Object-generated harmful factors

If traditional shielding solutions are implemented to reduce electromagnetic interference, then electromagnetic interference is reduced, but product cost increases

Engineering Contradiction:

Improveelectromagnetic interferenceVSAvoidproduct cost

Core Design Contradiction:

Object-generated harmful factorsVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent uses computational resources and software algorithms (intangible, low-cost resources) instead of expensive physical shielding materials. The frequency management approach consumes minimal energy and requires no additional bill-of-materials components, reducing product cost while maintaining compliance.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS10459874B2System and method for managing electromagnetic interference for electronic devices

Publication Date: 2019.10.29 TEXAS INSTRUMENTS INC

AI summary

According to an embodiments, a system and method for managing electromagnetic interference in an electronic charging unit is disclosed. The operating frequencies of multiple electronic devices interfacing with the electronic charging unit may be dynamically altered to manage electromagnetic interference from each electronic device such that the aggregated electromagnetic interference from all electronic devices remains within predetermined limits.