Wireless Power Transmitter With Separate Sensing And Transmitting Coils

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Solution Overview

Problem

Existing wireless power transmission systems face challenges in accurately determining whether a new wireless power receiver or foreign material has come into proximity with the transmitter while transmitting power, leading to potential misidentification and inefficient energy transfer.

Innovation Solution

A wireless power transmitter equipped with separate sensing and transmitting coils, where the sensing coil operates independently to detect changes in impedance through a short beacon signal, allowing the controller to determine if an object is a valid receiver and control power transmission effectively, even during active power transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single coil is used for both sensing and power transmission, then device complexity is reduced, but measurement precision deteriorates due to inability to accurately distinguish receiver from foreign materials during active power transfer

Engineering Contradiction:

Improvecoil structureVSAvoidobject identification accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent divides the single coil into two separate coils: a transmitting coil for power transmission and a sensing coil for detecting objects. This segmentation allows independent optimization of each coil's function, enabling accurate detection during active power transfer without interference from power transmission operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sensing function is extracted from the power transmission function by using a dedicated sensing coil that operates independently. This extracted sensing capability can continuously monitor for objects without being affected by the power transmission state, solving the identification accuracy problem.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If beacon signal transmission is performed for a predetermined period before power transmission, then object detection capability is improved, but loss of time increases due to delayed power transfer initiation

Engineering Contradiction:

Improveobject detection capabilityVSAvoidpower transfer initiation delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The sensing coil continuously transmits beacon signals and monitors for objects without interruption, even during active power transmission. This continuous sensing eliminates the need for separate detection phases, maintaining high detection reliability while eliminating time delays in power transfer initiation.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The sensing coil performs preliminary object detection continuously in the background before, during, and after power transmission. This preliminary and ongoing detection ensures objects are identified in advance without delaying the power transfer process.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If power transmission is initiated immediately upon object detection, then productivity is improved, but reliability deteriorates due to potential misidentification of foreign materials as receivers

Engineering Contradiction:

Improvepower transfer speedVSAvoidreceiver identification accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

By separating sensing and power transmission into different coils, the system can perform continuous object monitoring with the sensing coil while maintaining power transmission with the transmitting coil. This allows immediate power transfer initiation upon detection while ensuring accurate identification through dedicated sensing operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sensing coil provides continuous feedback about detected objects to the controller, enabling real-time decision-making. This feedback mechanism ensures reliable identification of receivers versus foreign materials while maintaining fast response times for power transfer initiation.

Inventive Principle:

Principle #23Feedback

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 enables accurate identification of the wireless power receiver and prevents foreign material interference, ensuring efficient and safe power transfer by using separate coils for sensing and transmitting, allowing for reliable operation even when objects approach during active charging.

Implementation Method 1

the sensor may be configured to sense the object in proximity therewith, while the power transmitter wirelessly transmits power to the wireless power receiver

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a power transmitter comprising a transmitting coil configured to magnetically couple to a receiving coil of a wireless power receiver

Methodology Applied

Scientific EffectMagnetic coupling: Electromagnetic Induction

Data Source

PatentUS10164474B2Wireless power transmitter and wireless power transmission method

Publication Date: 2018.12.25 WITS CO LTD

AI summary

A wireless power transmitter includes a sensor configured to sense an object, a power transmitter configured to wirelessly transmit power to a wireless power receiver, and a controller configured to determine whether the object is the wireless power receiver, and control the power transmitter to wirelessly transmit power to the wireless power receiver upon the object being determined to be the wireless power receiver, wherein the sensor and the power transmitter comprise separate coils.