D2D Wireless Power Reception Mode Switching for IoT Charging

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Solution Overview

Problem

Existing wireless power solutions for IoT devices are limited by wired charging's mobility constraints, short-range wireless charging's limited distance, and long-distance RF charging's inefficiency and power waste due to inaccurate beam steering.

Innovation Solution

A D2D-based wireless power receiving device that monitors its internal battery, estimates usage and workload, and selects a reception mode using a deep learning-based model to efficiently receive power from other devices through short-range or long-range wireless charging, or reject power when not needed.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wired charging method is used, then charging reliability is improved, but device mobility is limited

Engineering Contradiction:

Improvecharging reliabilityVSAvoiddevice mobility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the mechanical connection system (wired charging with physical cables) with a wireless electromagnetic field-based power transmission system. The transmitting device generates electromagnetic signals that are received by the receiving device through wireless communication, eliminating the need for physical cable connections while maintaining reliable power transfer.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If short-range wireless charging system is used, then device mobility is improved, but charging distance is limited

Engineering Contradiction:

Improvedevice mobilityVSAvoidcharging distance

Core Design Contradiction:

Ease of operationVSLength of stationary object

Solution Approach 1:

The patent implements dynamic adaptive power reception by continuously monitoring battery status (charge level, usage patterns, workload) and adjusting the reception mode accordingly. The system can switch between different receiving coils and power reception strategies based on real-time conditions, enabling flexible operation at varying distances from the transmitting device rather than being constrained to a fixed charging distance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes operational parameters (power reception level, coil selection, transmission mode) based on battery status. When battery charge is low, the system activates power reception; when charge is sufficient, it stops reception. The system also adjusts reception strength and selects appropriate coils based on distance and power requirements, transforming the static charging distance limitation into a dynamic adaptability feature.

Inventive Principle:

Principle #35Parameter changes

3Length of stationary object

If long-distance wireless charging system using RF signal is used, then charging distance is improved, but power consumption increases

Engineering Contradiction:

Improvecharging distanceVSAvoidpower consumption

Core Design Contradiction:

Length of stationary objectVSUse of energy by moving object

Solution Approach 1:

The patent applies partial action by selectively activating power reception only when necessary. The system monitors battery charge levels and only initiates power reception when the battery is below a threshold level. Additionally, it uses partial power reception by adjusting the reception strength to match actual power needs, avoiding excessive energy consumption while maintaining adequate charging distance capability.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent implements feedback mechanisms where the receiving device continuously monitors its own battery status and transmits this information to the transmitting device. Based on this feedback, the system dynamically adjusts transmission power levels and reception settings, ensuring energy-efficient operation at long distances by transmitting only the necessary amount of power rather than maintaining constant high-power transmission.

Inventive Principle:

Principle #23Feedback

4Length of stationary object

If long-distance wireless charging system is used, then charging distance is improved, but power waste increases due to inaccurate beam steering

Engineering Contradiction:

Improvecharging distanceVSAvoidpower waste

Core Design Contradiction:

Length of stationary objectVSLoss of energy

Solution Approach 1:

The patent changes transmission and reception parameters (power levels, frequency, modulation depth) based on detected battery status and distance conditions. When the device is far from the transmitter or battery charge is high, the system reduces transmission power and adjusts reception sensitivity, thereby minimizing energy waste from inaccurate beam steering and unnecessary power transfer.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20230420989A1Device-to-device based wireless power receiving device and method

Publication Date: 2023.12.28 SKAICHIPS CO LTD

AI summary

Provided is a device-to-device (D2D)-based wireless power receiving device including an observation part configured to monitor a battery, an estimator configured to estimate usage and a workload of the battery on the basis of a result of monitoring the battery, a mode determiner configured to determine required power of the battery on the basis of the usage and the workload, and determine a reception mode according to the required power, and a power receiver configured to wirelessly receive power from another device according to the reception mode. Accordingly, wireless power charging efficiency can be maximized.