Modulation Method for Reducing Current Surges in Power Control

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Solution Overview

Problem

Conventional control techniques face issues with current surges during high-load demands, leading to potential damage and increased costs due to the need for additional hardware, increased power specifications, or reduced power output to mitigate surges.

Innovation Solution

A modulation method that generates optimized sinusoidal signals by calculating differences between maximum, median, and minimum values of input signals and comparing these to predetermined limits to adjust the modulation signals, eliminating the need for additional hardware or increased power specifications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If additional detection devices and activation power are provided to eliminate surge signals, then the functionality and reliability are improved, but the device complexity, volume, and costs are increased

Engineering Contradiction:

ImprovefunctionalityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the surge elimination function from separate hardware components and integrates it into the existing control circuit's modulation process. By taking out the harmful surge signals and processing them through the modulation system using existing components, the invention eliminates the need for additional detection devices while maintaining reliability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The control circuit is designed to perform multiple functions: it generates modulation signals for normal operation and simultaneously processes surge signals through the same modulation system. The modulation circuit universally handles both regular control signals and surge elimination, eliminating the need for dedicated surge detection hardware

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If specifications of the power element are augmented with increased power volume and size to prevent burning, then the reliability is improved, but the device volume and manufacturing costs are increased

Engineering Contradiction:

Improveprotection against burningVSAvoiddevice volume

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent applies preliminary action by detecting and eliminating surge signals before they can cause damage to the power element. The modulation system proactively processes the input signals to remove harmful components ahead of time, preventing the need for oversized protective components

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the parameters of the modulation signal dynamically based on the detected surge conditions. By adjusting the modulation depth and frequency characteristics in real-time, the system protects the power element from burning without requiring increased power ratings or larger physical dimensions

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a filter circuit and capacitor of higher specifications are provided to remove harmonic signals, then the reliability is improved, but the manufacturing costs are significantly increased

Engineering Contradiction:

Improvesystem malfunction preventionVSAvoidmanufacturing costs

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces the mechanical/electrical filter circuit approach with a signal processing approach. Instead of using physical filters and capacitors to remove harmonics, the modulation system electronically processes the signals to eliminate harmful components, substituting complex hardware filtering with control algorithm-based filtering that uses existing circuit components

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Object-affected harmful factors

If the amplitude of the input signal is reduced to decrease the surge wave, then the harmful factors are reduced, but the power output of the load is affected and maximum performance cannot be achieved

Engineering Contradiction:

Improvesurge wave amplitudeVSAvoidpower output

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The patent applies local quality by selectively processing different portions of the input signal. The modulation system identifies and eliminates only the harmful surge components while preserving the useful signal portions that contribute to power output. This localized processing ensures that surge reduction does not compromise overall power delivery

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention converts the harmful surge signals into beneficial information for control optimization. By analyzing the surge characteristics, the modulation system adjusts the modulation parameters to improve overall system performance, turning what was previously a harmful effect into an opportunity for optimization that maintains or even enhances power output

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS8994468B2Modulation method and control device having the same

Publication Date: 2015.03.31 IND TECH RES INST

AI summary

A modulation method is provided. The modulation method includes the steps of receiving multiple sinusoidal signals, obtaining the maximum value of the sinusoidal signals, obtaining the median value of the sinusoidal signals, and obtaining the minimum value of the sinusoidal signals within a period to generate a difference between the maximum value and the minimum value, generating a difference according to an upper limit and a lower limit of a predetermined comparison value, and comparing the two differences to generate an optimized modulation signal.