Wireless Power Transmission Control for Reflective Wave Damage

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Solution Overview

Problem

Conventional wireless power transmission systems experience damage due to reflective waves generated when batteries are charged, particularly in sections where the charging mode changes from constant current to constant voltage, leading to discharging and inefficiencies.

Innovation Solution

A wireless power transmission system that includes a transmission control unit to detect the charging status of a battery and adjust the power transmission to lower levels when the battery is in a damage section due to reflective power, using detection units for current and voltage status to generate code information and control the power transmission accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the battery is charged with constant current until charging voltage reaches a set voltage, then charging speed is improved, but reflective waves are generated that damage transmission and reception devices

Engineering Contradiction:

Improvecharging speedVSAvoidreflective wave damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by transitioning from a static constant current charging mode to a dynamic charging process that adjusts current based on real-time voltage detection. The system dynamically switches between constant current and constant voltage modes at the transition point, preventing reflective waves while maintaining efficient charging.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback by detecting the battery's charging voltage in real-time and using this information to control the charging current. When the voltage reaches the transition point, the system receives feedback and automatically adjusts the charging mode from constant current to constant voltage, eliminating reflective waves.

Inventive Principle:

Principle #23Feedback

2Reliability

If the battery is charged with constant voltage after reaching set voltage, then device stability is improved, but charging current becomes excessively low reducing efficiency

Engineering Contradiction:

Improvedevice stabilityVSAvoidcharging efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies periodic action by dividing the charging process into two distinct phases: constant current charging for rapid energy transfer, followed by constant voltage charging for stable completion. This periodic switching optimizes both efficiency and stability at different charging stages.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent implements parameter changes by transitioning the charging parameters from constant current (high efficiency phase) to constant voltage (stability phase) at the transition point. This parameter adjustment allows the system to maintain high charging efficiency while ensuring device stability.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If high power is transmitted during normal operation, then charging efficiency is improved, but damage occurs in NDR sections due to reflective waves

Engineering Contradiction:

Improvecharging efficiencyVSAvoidreflective wave damage in NDR sections

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by detecting the transition point before reflective waves can cause damage. The system proactively switches from constant current to constant voltage mode at the precise moment when the battery reaches set voltage, preventing the generation of harmful reflective waves before they can occur.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements skipping by rapidly transitioning through the transition point from constant current to constant voltage mode. This quick switch prevents the system from lingering in the dangerous NDR section where reflective waves would cause damage, effectively rushing through the critical transition zone.

Inventive Principle:

Principle #21Skipping (Rushing through)

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

Minimizes damage to transmission and reception devices by reducing power transmission during harmful reflective wave sections, enhancing the stability and reliability of the wireless power transmission system.

Implementation Method 1

a transmission unit generating and transmitting power for charging a battery; a reception unit receiving the transmitted power

Methodology Applied

Scientific EffectElectromagnetic energy transmission: Electromagnetic Induction

Data Source

PatentUS9178389B2Wireless power transmission system and method of controlling the same

Publication Date: 2015.11.03 WITS CO LTD

AI summary

Disclosed herein is a wireless power transmission system, including: a transmission unit generating and transmitting power for charging a battery; a reception unit receiving the transmitted power and charging the battery with power; and a transmission control unit detecting a charging status of the battery by using the transmitted power, and, if the charging status of the battery is in a damage section due to reflective power, controlling the transmission unit to transmit power lower than power of a normal operation, whereby damage of transmission and reception devices due to a reflective wave can be minimized.