Universal Dimming Input Circuit for Multiple Signal Types
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lighting circuits require multiple leads and specific designs for different dimming signal types, such as analog and PWM signals, increasing costs and complexity.
Innovation Solution
A lighting circuit with a single dimming input capable of detecting and responding to various dimming signal types, including analog and PWM signals, using a combination of constant current circuits, analog voltage acceptance circuits, PWM signal acceptance circuits, and dimming range limitation circuits to generate a local dimming signal suitable for controlling luminaire luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple leads are supplied for different dimming signal types, then the lighting circuit can support multiple dimming types, but the device complexity and cost increase
Solution Approach 1:
The patent implements a universal dimming input terminal that can accept multiple dimming signal types (analog voltage, PWM, and variable resistance signals) through a single lead connection. The lighting circuit automatically detects the signal type and processes it accordingly, eliminating the need for separate leads for each dimming type while maintaining full compatibility with all three signal formats.
2Reliability
If separate lighting circuits are designed for each dimming type, then each circuit can be optimized for its specific signal type, but the manufacturing cost increases
Solution Approach 1:
The patent combines multiple dimming signal processing circuits into a single integrated lighting circuit. The circuit includes an analog voltage acceptance path, a PWM signal acceptance path, and a variable resistance acceptance path, all merged into one unified design that shares common components such as the luminaire driver and control logic. This consolidation maintains signal-specific processing accuracy while reducing manufacturing costs through standardized production.
3Device complexity
If a single dimming input is used for multiple signal types, then the device complexity is reduced, but the difficulty of detecting and measuring the correct signal type increases
Solution Approach 1:
The patent implements preliminary signal type detection through a dedicated detection circuit that analyzes the incoming dimming signal characteristics before processing. The circuit detects whether the input is an analog voltage signal, PWM signal, or variable resistance signal by examining signal properties such as voltage levels, frequency content, and impedance characteristics. This preliminary detection enables the control circuit to automatically configure the appropriate processing path, eliminating the need for manual configuration or complex user intervention.
Data Source
AI summary
A lighting circuit constituted of: a single dimming input; a pulse width modulation acceptance circuit arranged to convert a pulse width modulated dimming signal received at the single dimming input into a local dimming signal, the local dimming signal exhibiting a predetermined format; an analog voltage level acceptance circuit arranged to convert an analog voltage dimming signal received at the single dimming input into the local dimming signal exhibiting the predetermined format; and a luminaire driving circuit responsive to the local dimming signal.