Pulse Dimming Circuit Integrating DC and PWM Inputs
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Solution Overview
Problem
Existing pulse dimming systems for cold cathode fluorescent lamps (CCFL) require separate circuit boards for DC and PWM input methods, leading to increased cost and incompatibility between the two methods.
Innovation Solution
A pulse dimming circuit that integrates both DC and PWM input signals using a comparison signal generator, a comparator, and a logic module, allowing for adaptive switching between the two input signals, thereby eliminating the need for separate circuit boards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate circuit boards are used for DC and PWM input methods, then each method can operate independently, but the cost increases and compatibility between methods is reduced
Solution Approach 1:
The patent combines DC input processing and PWM input processing into a single circuit board by integrating a comparison wave generator that can handle both input types through a unified architecture, eliminating the need for separate circuit boards while maintaining independent operation capability
Solution Approach 2:
The comparison wave generator is designed with multi-functionality to accept both DC input signals and PWM input signals, processing them through the same circuit board using different operational modes, thereby achieving universal compatibility without requiring separate dedicated circuits
2Ease of manufacture
If separate circuit boards are used for DC and PWM input methods, then each method has dedicated processing, but manufacturing cost increases
Solution Approach 1:
The patent merges the functionality of multiple dedicated circuit boards into a single integrated circuit board, reducing the quantity of components and materials required while maintaining dedicated processing capability through software or control logic differentiation
3Adaptability or versatility
If a comparison wave generator is used for DC input, then pulse dimming signal can be generated, but the circuit becomes incompatible with PWM input method
Solution Approach 1:
The comparison wave generator is designed as a universal device that can operate in different modes to accommodate both DC input and PWM input methods, adjusting its internal configuration based on the input type detected, thereby achieving adaptability without proportionally increasing device complexity
4Adaptability or versatility
If integrated circuit is used for both DC and PWM inputs, then cost is reduced and compatibility is enhanced, but circuit complexity increases
Solution Approach 1:
The integrated circuit employs a universal comparison wave generator architecture that handles both DC and PWM inputs through a single unified design, achieving enhanced compatibility while controlling circuit complexity through efficient resource sharing and modular design principles
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 integrated circuit enables seamless operation with either DC or PWM input signals, reducing costs and enhancing compatibility, allowing for self-adaptive switching between input signals, thus providing a more efficient and cost-effective solution for pulse dimming in CCFL systems.
Implementation Method 1
By comparing a DC input signal with a reference comparison wave, a pulse dimming signal is generated
Implementation Method 2
a comparison wave generator is required. By comparing a DC input signal with a reference comparison wave
Data Source
AI summary
The present invention provides a pulse dimming circuit and a method thereof. The pulse dimming circuit is compatible for both DC input signal and PWM input signal using only one circuit board, and includes a first input port, a second input port, a comparison signal generator, a comparator, a logic module, and a switch network electrically coupled to the second input port, an output terminal of the comparator, and an output terminal of the logic module.