Modular LED Lamp Digital Communication for Calibration
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Solution Overview
Problem
Existing LED lighting systems require individual calibration for each lamp to account for variations in LED chips' light output and color reproduction, making them inflexible and costly to manufacture, as well as requiring complex dimming circuitry to maintain target color characteristics under varying conditions.
Innovation Solution
A modular LED lighting system that enables digital and/or analog communication between the LED module and the power supply unit, allowing the power supply to adjust its drive current based on information from the LED module's microcontroller, enabling thermal shutdown, thermal dimming, and brightness adjustment without needing to calibrate the assembled lamp.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If individual calibration is performed for each LED lamp to account for LED chip variations, then light output consistency and color reproduction are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The system divides the lamp into two independent modules: an LED module containing LEDs and a microcontroller, and a power supply unit with its own controller. Each module can be manufactured and calibrated independently, eliminating the need for complex integrated calibration while maintaining overall system precision through digital communication between modules.
Solution Approach 2:
The microcontroller in the LED module communicates with the power supply unit controller, providing feedback about the specific LED chips installed. This enables the power supply to automatically adjust drive current and compensation parameters based on the actual LED characteristics, achieving precise light output control without manual calibration of the complete lamp.
2Manufacturing precision
If LED lamps are manufactured as matched pairs with integrated calibration, then light output consistency is improved, but manufacturing flexibility and interchangeability worsen
Solution Approach 1:
The lamp is segmented into replaceable modules with standardized interfaces. The LED module and power supply unit can be independently manufactured and tested, then assembled. This modular design maintains light output consistency through controlled communication protocols while enabling flexibility in module selection and replacement.
Solution Approach 2:
The power supply unit controller is designed to work with multiple different LED modules through digital communication. The controller can receive and process information from various LED chip configurations, making the power supply universal and enabling interchangeability of LED modules without requiring recalibration of the entire system.
3Manufacturing precision
If complex dimming circuitry is added to maintain target color characteristics, then color consistency under varying conditions is improved, but device complexity and cost increase
Solution Approach 1:
The microcontroller in the LED module provides real-time feedback about the actual LED output characteristics to the power supply unit controller. This feedback mechanism enables automatic adjustment of drive current and dimming parameters to maintain target color characteristics, replacing complex analog dimming circuitry with simpler digital control based on actual measured conditions.
Solution Approach 2:
Complex analog dimming and color control circuitry is replaced with digital communication and software-based control algorithms. The microcontroller and power supply controller use digital protocols to exchange information and compute appropriate drive parameters, simplifying the hardware while improving precision through programmable compensation.
Data Source
AI summary
A modularized LED lamp is disclosed. Embodiments of the present invention provide an LED lamp in which digital and/or analog communication takes place between the LED module and the power supply unit (PSU) of the lamp. A controller in the LED module sends signals to the PSU, allowing separation of the two parts so that each part can be manufactured independently as opposed to being manufactured as a calibrated, matched pair. The LED module, by way of its controller, provides information to the PSU that allows the power supply to adjust its drive current appropriately. The PSU controller can also respond to operating temperature variations of the LEDs in order to provide thermal shutdown, brightness compensation, and other control if needed. In some embodiments, a controller in the PSU also responds to an external dimming input.