Universal Power Inverter for CCFLs Using Power Factor Sensing
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Solution Overview
Problem
Conventional power inverters require complex and costly design to effectively drive cold cathode fluorescent lamps (CCFLs) in portable computers, as each CCFL size and manufacturer has unique electrical characteristics, necessitating multiple inverter configurations for efficient power consumption.
Innovation Solution
A universal power inverter system with a sensing module to detect the power factor of the load and a control module to adjust the output characteristics of the alternating current, allowing for adaptation to various CCFL sizes and manufacturers, comprising a switching module, sensing module, and control module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple inverter configurations are designed for different CCFL sizes and manufacturers, then power consumption efficiency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a universal inverter design that can drive multiple CCFL sizes and manufacturers by incorporating a sensing module to detect power factor and a control module to adjust output characteristics dynamically, eliminating the need for multiple dedicated inverter configurations
Solution Approach 2:
The inverter employs dynamic output adjustment based on real-time power factor sensing, allowing the output characteristics (voltage, current, frequency) to be continuously adapted to match the specific electrical characteristics of different CCFL loads
2Use of energy by moving object
If multiple inverter configurations are designed for different CCFL sizes and manufacturers, then power consumption efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements a universal inverter design that can drive multiple CCFL sizes and manufacturers by incorporating a sensing module to detect power factor and a control module to adjust output characteristics dynamically, eliminating the need for multiple dedicated inverter configurations
Solution Approach 2:
The inverter changes its output parameters (voltage, current, frequency) based on sensed power factor to optimize efficiency for different CCFL loads, achieving multiple configuration benefits through software control rather than hardware variations
3Device complexity
If a universal inverter is designed to drive multiple CCFLs, then device complexity is reduced, but power consumption efficiency may worsen
Solution Approach 1:
The patent incorporates a sensing module that continuously monitors the power factor of the connected CCFL and provides feedback to the control module, which adjusts the output characteristics to maintain optimal power consumption efficiency for each specific load
Solution Approach 2:
The inverter automatically detects and adapts to the connected CCFL's electrical characteristics without requiring manual configuration or intervention, achieving both simplicity and efficiency through self-adjustment
Data Source
AI summary
Methods and systems for controlling a power inverter are provided. In accordance with one embodiment, a system for converting a direct current into an alternating current may include a switching module, a sensing module, and a control module. The switching module may have an input and an output, and may be operable to receive a direct current at the input and to generate at the output a corresponding alternating current with a desired output characteristic. The sensing module may be coupled to the switching module output, and may be operable to sense a power factor associated with a load coupled to the switching module output. The control module may be coupled to the power inverter and the sensing module, and may be operable to control the desired output characteristic based at least on the sensed power factor.