Wireless Power Source Coil Position Detection

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Solution Overview

Problem

In wireless power transfer systems using magnetic field resonance, the efficiency of power transfer varies with the posture and distance of the power receiver relative to the power source, making it difficult to set precise power supply conditions without detecting the receiver's position and posture, leading to delays in actual power transfer.

Innovation Solution

A power source system that includes a power source coil, a power transfer control unit, and a power receiver detection unit, which detects the power receiver using proximity or contact, allowing for efficient power transfer by controlling magnetic fields based on calculated positional information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If magnetic field resonance scheme is used to enable longer power supply distance and higher position freedom, then power transfer flexibility is improved, but power transfer efficiency varies with posture and distance making precise control difficult

Engineering Contradiction:

Improvepower transfer flexibilityVSAvoidpower transfer efficiency stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system employs feedback mechanisms where the power source detects the presence and position of the power receiver, then adjusts the magnetic field parameters accordingly. This closed-loop control ensures stable power transfer efficiency despite variations in distance and posture, resolving the contradiction between flexibility and reliability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The power source dynamically adjusts its operating parameters based on real-time detection of the power receiver's position and posture. By making the system adaptive rather than static, it maintains optimal power transfer efficiency across varying conditions, thus achieving both flexibility and reliability.

Inventive Principle:

Principle #15Dynamics

2Measurement precision

If test power transfer is performed to achieve appropriate output setting, then power supply accuracy is improved, but time delay occurs before actual power transfer starts

Engineering Contradiction:

Improvepower supply accuracyVSAvoidpower transfer start delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs preliminary detection and calculation of positional information before actual power transfer begins. By pre-establishing the power receiver's position and computing optimal power supply parameters in advance, the system eliminates the need for time-consuming test power transfer while maintaining accurate power supply control.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention replaces the trial-and-error test power transfer method with a computational approach. By using sensors and algorithms to calculate optimal settings beforehand, it substitutes physical testing with intellectual processing, thereby achieving accurate power supply without time delay.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If three-dimensional wireless power transfer is performed using synthetic magnetic field, then power supply versatility is improved, but control complexity increases requiring calculation of initial values

Engineering Contradiction:

Improvepower supply versatilityVSAvoidcontrol complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The system introduces an intermediary computational layer that calculates positional information and determines optimal power supply parameters. This intermediary processing step simplifies the overall control by breaking down the complex three-dimensional control problem into manageable calculations based on detected position data.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention replaces complex manual or iterative control methods with automated computational algorithms. By using sensors to detect position and algorithms to calculate optimal settings, it substitutes complex mechanical or procedural control with intelligent computation, reducing overall system complexity while maintaining versatility.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 immediate and efficient power supply to power receivers by accurately determining and adjusting power transfer conditions, reducing the delay in starting power transfer and improving stability and accuracy.

Implementation Method 1

a power source coil configured to wirelessly transfer power to a power receiver using magnetic field resonance

Methodology Applied

Scientific EffectMagnetic field resonance: Resonance

Implementation Method 2

techniques which use electromagnetic induction or radio waves are known

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS10541570B2Power source, wireless power transfer system, and positional information calculation method of power receiver

Publication Date: 2020.01.21 FUJITSU LTD

AI summary

A power source includes a power source coil, a power transfer control unit, and a power receiver detection unit. The power source coil is configured to wirelessly transfer power to a power receiver using one of magnetic field resonance and electric field resonance, and the power transfer control unit is configured to control the power source coil. Further, the power receiver detection unit is configured to detect the power receiver by bringing the power receiver into proximity thereto or contact therewith.