Symmetrical Wearable Charging Interface for Reversible Wired Control

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Solution Overview

Problem

Wearable devices face challenges with limited space and power resources, requiring charge and control systems different from those used in other environments, and existing cable connections like USB form factors involve excessive complexity.

Innovation Solution

A symmetrical interface with contact pads and magnetic fastening contacts allows a reversible connector to align in either direction, coupled with field effect transistors for charging and communication, and a system that cycles through device states for efficient charging and data transfer using a two-line communication path.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional USB form factor connections are used for charging and control, then reliable electrical connection is achieved, but device complexity and space requirements increase excessively

Engineering Contradiction:

Improveconnection reliabilityVSAvoidconnector complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines charging and control functions into a single symmetrical interface with only two contact pads, eliminating the need for separate connectors. This merging reduces device complexity while maintaining reliable electrical connection for both power transfer and data communication

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The symmetrical interface serves multiple functions: it provides electrical connection for charging, enables bidirectional control signaling, and supports both transmitting and receiving modes. This multi-functionality eliminates the need for separate specialized connectors, reducing overall device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If symmetrical interface with reversible connector is used, then ease of operation and damage prevention are improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveconnector usabilityVSAvoidcontact pad alignment

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

While the overall interface is symmetrical, the patent uses asymmetrical magnetic fastening contacts with different polarities to provide orientation guidance. This allows the connector to be easily inserted in the correct orientation while preventing incorrect insertion, balancing ease of operation with manufacturing feasibility

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The magnetic fastening mechanism provides self-aligning and self-latching functionality. The magnetic attraction automatically guides the connector into proper alignment with the contact pads, reducing the precision requirements for manual assembly while ensuring reliable electrical connection

Inventive Principle:

Principle #25Self-service

3Use of energy by moving object

If limited circuitry is used in wearable devices, then power consumption and device size are reduced, but charging and control functionality is compromised

Engineering Contradiction:

Improvepower consumptionVSAvoidcharging control capability

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The patent implements periodic state cycling between charging and communication modes. The system alternates between receiving charge and exchanging control signals, allowing full functionality to be achieved through time-division multiplexing rather than requiring simultaneously active complex circuitry, thus reducing power consumption

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system dynamically switches between different operational states (charging state, communication state, transmitting state, receiving state) based on current needs. This dynamic state management allows limited circuitry to perform multiple functions at different times, maintaining versatility while minimizing power consumption when full functionality is not required

Inventive Principle:

Principle #15Dynamics

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

Enables simple, damage-resistant charging and communication with limited circuitry, supporting various form factors and preventing connector damage while optimizing power usage and data transfer efficiency.

Implementation Method 1

A wearable device includes a symmetrical interface with a first and second contact pad and a magnetic fastening contact

Methodology Applied

Scientific EffectMagnetic fastening: Magnetism

Data Source

PatentUS20260018912A1Circuits and methods for wearable device charging and wired control

Publication Date: 2026.01.15 SNAP INC

AI summary

Methods and devices for wired charging and communication with a wearable device are described. In one embodiment, a symmetrical contact interface comprises a first contact pad and a second contact pad, and particular wired circuitry is coupled to the first and second contact pad to enable charging as well as receive and transmit communications via the contact pads as part of various device states.