Wireless Power Receiver Detuning for Fair Multi-Device Charging

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Solution Overview

Problem

The rapid growth of IoT devices using near-field wireless charging poses challenges in protecting them from harsh transient signals caused by counterfeit wireless chargers, particularly for underdamped LC resonant tank circuits which can lead to overvoltage or overcurrent conditions, and existing authentication protocols become unsustainable with multiple receivers and chargers.

Innovation Solution

A wireless resonant inductive power receiver system with cooperative power sharing capabilities, featuring a main inductive element and an auxiliary inductive element, where the resonant frequency is adjusted using a detuning engine to control the impedance and redistribute power between receivers, ensuring secure and efficient energy transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If multiple wireless receivers are coupled to the same charger, then power delivery capacity increases, but power distribution fairness deteriorates due to proximity-based power allocation

Engineering Contradiction:

Improvenumber of receiversVSAvoidpower distribution fairness

Core Design Contradiction:

Quantity of substanceVSEase of operation

Solution Approach 1:

The patent implements dynamic detuning control where each receiver can independently adjust its resonant frequency in real-time based on system conditions. This dynamic adjustment allows receivers to cooperate in redistributing power fairly, transforming a static proximity-based allocation system into a dynamic cooperative system that adapts to power delivery needs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the resonant frequency parameter of receivers to control power distribution. By detuning receivers from the charger's resonant frequency, the system can reduce power transfer to specific receivers, enabling fair power sharing among multiple receivers regardless of their proximity to the charger.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If resonant frequency is detuned to redistribute power, then power distribution control improves, but power transfer efficiency deteriorates

Engineering Contradiction:

Improvepower distribution controlVSAvoidpower transfer efficiency

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The patent applies partial detuning rather than complete detuning. Receivers can adjust their resonant frequency to be slightly offset from the charger's frequency, achieving sufficient power distribution control while minimizing the negative impact on power transfer efficiency. This partial action approach balances control capability with efficiency preservation.

Inventive Principle:

Principle #16Partial or excessive action

3Speed

If underdamped LC resonant tank circuits are used, then power transfer speed increases, but vulnerability to transient signals worsens leading to overvoltage or overcurrent conditions

Engineering Contradiction:

Improvepower transfer speedVSAvoidtransient signal vulnerability

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent implements preliminary protective measures by using authentication protocols to verify charger legitimacy before power transfer begins. This preliminary action prevents counterfeit chargers from causing transient signals and overvoltage/overcurrent conditions, protecting the system while maintaining the benefits of underdamped resonant circuits.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent employs authentication and verification mechanisms as a cushioning layer before power transfer. This beforehand protection ensures that only authorized chargers can interact with receivers, preventing harmful transient signals while allowing fast power transfer through underdamped resonant circuits when authentication succeeds.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 solution effectively detunes the resonant frequency of the main inductive element to redistribute power fairly among multiple receivers, enhancing security and efficiency in wireless power transfer systems by preventing damage from transient signals and ensuring scalable authentication.

Implementation Method 1

a main inductive element resonating at a frequency... an auxiliary inductive element wirelessly coupled to the main inductive element

Methodology Applied

Scientific EffectElectromagnetic Induction: Electromagnetic Induction

Implementation Method 2

resonant wireless power transfer system... main inductive element resonating at a frequency... resonant frequency is adjusted using a detuning engine

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS11018526B2Detuning for a resonant wireless power transfer system including cooperative power sharing

Publication Date: 2021.05.25 MASSACHUSETTS INST OF TECH

AI summary

Wireless resonant inductive power receivers for achieving detuning for a resonant wireless power transfer system including cooperative power sharing is described. Cooperative power sharing allows for detuning one or more wireless received coupled to a wireless charger to alter the power received at each wireless receiver.