LED Driver Programming via Prefix Signal
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Solution Overview
Problem
Conventional LED driver circuits face issues with speed and accuracy in transmitting digital messages due to their predominantly analog circuitry, leading to inefficiencies in programming the output current level.
Innovation Solution
The proposed solution involves using a microcontroller within the LED driver to receive a prefix signal through existing dimming leads, allowing it to enter a programming mode and set the output current level accurately, and optionally utilizing a negative voltage signal to invert into a positive voltage for programming, eliminating the need for additional wires and enhancing programmability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital messages are transmitted through analog circuitry to program the LED driver, then the LED driver can be programmed with different output current levels, but the speed and accuracy of the digital messages are distorted and diminished
Solution Approach 1:
The patent replaces the analog circuitry-based digital message transmission system with a direct digital communication interface. The microcontroller communicates with the programming interface using digital signals rather than converting digital messages to analog form for transmission, thereby eliminating the distortion and accuracy loss inherent in analog transmission of digital data.
2Adaptability or versatility
If digital messages are transmitted through analog circuitry to program the LED driver, then the LED driver can be programmed with different output current levels, but the transmission speed is reduced
Solution Approach 1:
The patent eliminates the analog-to-digital conversion process by implementing a direct digital communication interface between the programming interface and the microcontroller. This substitution of the analog transmission mechanism with a digital one directly increases the transmission speed of programming commands while maintaining the programmability function.
3Device complexity
If a prefix signal is used to instruct the microcontroller to enter programming mode through existing dimming leads, then additional wires are eliminated and device complexity is reduced, but the programming mode must be reliably distinguished from normal operation
Solution Approach 1:
The patent uses a prefix signal approach where a specific sequence or pattern of signals on the existing dimming leads is recognized as a command to enter programming mode. By inverting the normal operation assumption and looking for specific anomaly patterns (the prefix) rather than trying to add dedicated control lines, the system reliably distinguishes programming mode from normal operation while using existing infrastructure.
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
This approach enables efficient and accurate programming of the output current, allowing a single LED driver to support various loads and lighting fixtures by reducing reliance on digital message accuracy through analog circuitry and utilizing existing circuitry for programming.
Implementation Method 1
An amplifier inverts the negative voltage into a positive voltage
Data Source
AI summary
Provided is a light emitting diode (LED) driver. The LED driver includes a microcontroller for setting a level of an output current of the driver. The driver is configured to receive a prefix as an input, the prefix instructing the microcontroller to enter a programming mode. The microcontroller is responsive to a level signal representative of the level of the output current during the programming mode.