Capacitive Coupling Power Charging Uniformity

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Solution Overview

Problem

Non-contact power charging apparatuses face inefficiencies due to electromagnetic induction characteristics, leading to decreased charging performance when the target electronic device is not centered over the electrode with high magnetic flux density, and there is a lack of uniform power distribution across multiple battery cells in existing non-contact charging schemes.

Innovation Solution

A non-contact power charging apparatus utilizing a capacitive coupling scheme, where a power transmitting apparatus with a single electrode transmits power to multiple power receiving electrodes, allowing for efficient charging of multiple battery cells through an electric field, ensuring uniform power distribution and stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electromagnetic induction scheme is used for non-contact power charging, then power can be transmitted without contact, but charging efficiency decreases when the device is not centered over the electrode with high magnetic flux density

Engineering Contradiction:

Improvecharging efficiencyVSAvoidposition tolerance

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the fundamental parameter of power transmission from electromagnetic induction to capacitive coupling. This involves switching from magnetic field-based energy transfer to electric field-based energy transfer, fundamentally altering the physical mechanism to achieve different performance characteristics including improved position tolerance and charging efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the electromagnetic induction mechanism with a capacitive coupling mechanism. By replacing the magnetic field-based system with an electric field-based system, the patent achieves better uniformity in power distribution across multiple battery cells and improved tolerance to positional variations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If contact terminals are used for power charging, then electrical connection is established, but contact terminals may be contaminated with external foreign materials and contact state may be easily degraded

Engineering Contradiction:

Improvecontact stateVSAvoidcontamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the mechanical contact-based power transmission system with a non-contact capacitive coupling system. This substitution eliminates the need for physical contact terminals, thereby removing the problems of contamination, oxidation, and contact degradation while maintaining reliable power transfer.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an electric field as an intermediary medium for power transmission. Instead of direct electrical contact between terminals, the electric field acts as a mediator to transfer energy across the air gap, eliminating the need for physical contact and associated contamination issues.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If non-contact power charging with electromagnetic induction is used, then contactless power transfer is achieved, but uniform power distribution among multiple battery cells is not realized

Engineering Contradiction:

Improvepower distribution uniformityVSAvoidcharging performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent changes the fundamental transmission parameter from magnetic flux density distribution to electric field distribution. The capacitive coupling mechanism naturally provides more uniform electric field distribution across the battery cell array, enabling uniform power delivery to all cells simultaneously and improving overall charging performance.

Inventive Principle:

Principle #35Parameter changes

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

The capacitive coupling scheme enhances charging efficiency and uniformity across multiple battery cells, maintaining performance even when the device is not perfectly centered, and reduces the risk of contamination and energy loss associated with traditional contact charging methods.

Implementation Method 1

a non-contact type power charging apparatus charging the battery in a capacitive coupling scheme

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Implementation Method 2

transmits power in a capacitive coupling scheme

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS9673658B2Non-contact capacitive coupling type power charging apparatus and non-contact capacitive coupling type battery apparatus

Publication Date: 2017.06.06 WITS CO LTD

AI summary

A non-contact type power charging apparatus and a non-contact type battery apparatus may transmit power to each of a plurality of battery cells in a capacitive coupling scheme. The non-contact type power charging apparatus may include a power transmitting apparatus transmitting power in a capacitive coupling scheme, and a power receiving apparatus receiving the power transmitted from the power transmitting apparatus to charge each of a plurality of battery cells with the power. The non-contact type battery apparatus may include a plurality of power receiving electrodes each receiving power transmitted in a capacitive coupling scheme, and a plurality of battery cells each charged with the power transmitted to the plurality of power receiving electrodes.