Resonance Frequency Tracking for Sinusoidal Battery Charging

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Solution Overview

Problem

Conventional battery charging methods, such as Constant Current and Constant Voltage, do not effectively determine the optimal charging frequency, leading to inefficient energy transfer and reduced battery lifespan, while existing advanced methods are complex and costly.

Innovation Solution

A device and method that automatically traces and fixes the resonance frequency of batteries using a sinusoidal wave with a controllable sinusoidal power source, phase comparator, and small-signal detecting circuits to achieve the lowest AC impedance for optimal charging.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional charging methods (CC-CV) are used, then charging simplicity is maintained, but charging efficacy is unsatisfactory

Engineering Contradiction:

Improvecharging efficacyVSAvoidcharging method complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by varying the charging frequency to match the battery's resonance frequency. The charging method transforms from fixed frequency (conventional CC-CV) to variable frequency tracking, where the frequency parameter is dynamically adjusted to maximize charging efficacy while maintaining system simplicity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The system employs self-service through automatic frequency tracking using a phase-locked loop that autonomously detects and locks onto the battery's resonance frequency. This eliminates the need for complex manual tuning or trial-and-error methods, allowing the charging system to self-optimize without external intervention

Inventive Principle:

Principle #25Self-service

2Measurement precision

If empirical approach or trial and error method is used to find optimal charging frequency, then charging frequency can be determined, but the process is inefficient and lacks objective basis

Engineering Contradiction:

Improveoptimal charging frequency determinationVSAvoidtime to determine optimal frequency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent implements feedback through a phase-locked loop system that continuously monitors the battery's impedance characteristics and adjusts the charging frequency in real-time. The loop provides automatic feedback control, detecting phase differences and correcting frequency deviations to precisely lock onto the resonance frequency without time-consuming manual adjustments

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system replaces manual trial-and-error mechanical adjustment with an automated electronic control system. The phase-locked loop uses electronic feedback mechanisms to automatically determine the optimal frequency, substituting human-operated mechanical tuning with precise electronic measurement and control

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Use of energy by moving object

If non-resonance frequency is used for charging, then charging can proceed, but energy transfer efficiency is reduced and heat is generated

Engineering Contradiction:

Improveenergy transfer efficiencyVSAvoidheat generation

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent applies mechanical vibration principles by utilizing resonant oscillations at the battery's natural frequency. The sinusoidal charging current at resonance frequency creates constructive interference and maximum energy transfer, analogous to mechanical resonance, thereby maximizing efficiency and minimizing energy loss as heat

Inventive Principle:

Principle #18Mechanical vibration

Solution Approach 2:

The system exploits phase transitions in the sense of phase alignment - at resonance frequency, the phase difference between voltage and current is minimized (ideally zero), creating optimal energy transfer conditions. The phase-locked loop maintains this phase relationship, ensuring continuous operation at the most efficient energy transfer state

Inventive Principle:

Principle #36Phase transitions

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 approach extends battery lifespan by ensuring efficient energy transfer and minimizing heat generation during charging, thereby prolonging battery life.

Implementation Method 1

a charging frequency, which is changed according to a charging state of the batteries, adopts a resonance frequency of an AC Impedance of the batteries

Methodology Applied

Scientific EffectResonance: Resonance

Implementation Method 2

a phase comparator for determining a charging frequency of the batteries

Methodology Applied

Scientific EffectPhase comparison:

Implementation Method 3

a small-signal voltage detecting circuit for measuring a charging voltage of the batteries and for filtering a DC part of the charging voltage to acquire a small-signal voltage signal

Methodology Applied

Scientific EffectSignal filtering: Filter (electronic)

Data Source

PatentUS8829859B2Charger automatically tracking an optimal charging frequency for sinusoidal wave batteries

Publication Date: 2014.09.09 NATIONAL CHANGHUA UNIVERSITY OF EDUCATION

AI summary

A device and a method automatically trace and fix a resonance frequency of the batteries for offering an optimal charging frequency to the batteries. The device and method utilize a resonance frequency fr that charges batteries with a sinusoidal wave, automatic tracing function, and a fixed current. While the resonance frequency fr is adopted in a charging device and served as the optimum charging frequency, the using life of the batteries could be extended.