LED Lighting Controller with Programmable Current Source
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Solution Overview
Problem
Existing LED lighting systems lack efficient control mechanisms to optimize light output per watt over a wide temperature range, as they rely on resistors to limit current and do not monitor junction temperature, resulting in suboptimal performance and reduced efficiency.
Innovation Solution
A switch mode power supply controller with a programmable current source, heat sink temperature sensor, and communication ports for networked control, enabling independent current adjustment, power factor correction, and efficient operation across varying conditions, including high temperatures and different LED arrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If resistors are used to limit current in LED lighting, then the circuit is simple to implement, but the energy efficiency deteriorates and light output per watt is reduced
Solution Approach 1:
The patent replaces passive resistor-based current limiting with an active switch-mode power supply controller that uses electronic switching and control circuitry. This substitution enables precise current regulation through PWM control and active components, achieving 97-98% energy efficiency compared to the energy-wasting resistor approach.
Solution Approach 2:
The patent dynamically changes operating parameters including switching frequency, duty cycle, and current levels to optimize LED performance. The controller adjusts these parameters in real-time based on temperature feedback and operational requirements, maintaining peak efficiency across varying conditions rather than using fixed resistor values.
2Device complexity
If junction temperature is not monitored, then the device complexity is reduced, but the LED lifespan and performance deteriorate
Solution Approach 1:
The patent incorporates temperature sensors that continuously monitor LED junction temperature and provide feedback to the control circuit. This feedback loop enables the controller to adjust operating parameters in real-time, preventing thermal runaway and extending LED lifespan by maintaining operation within optimal temperature ranges.
Solution Approach 2:
The system performs self-monitoring and self-regulation of temperature conditions. The integrated temperature sensors and control algorithm automatically detect thermal conditions and adjust current delivery accordingly, eliminating the need for external monitoring equipment while ensuring optimal reliability.
3Ease of manufacture
If standardized components and networked control are implemented, then capital and maintenance costs are reduced, but the device complexity increases
Solution Approach 1:
The patent designs a universal controller architecture that can drive multiple LED configurations (series, parallel, or combinations) through programmable current sources. The same basic controller unit can be deployed in various lighting scenarios, and multiple controllers can be networked together using standardized communication protocols, reducing per-unit costs while maintaining flexibility.
Solution Approach 2:
The patent divides the lighting control system into modular controller units that can operate independently or be networked together. Each controller manages a specific LED string or group, allowing for scalable deployment where standardized modules are replicated and connected through communication networks, simplifying installation and maintenance while enabling centralized control.
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 solution achieves energy efficiency of 97-98% by optimizing current and voltage delivery to LEDs, extending their lifespan and maintaining efficiency under reduced brightness, while reducing capital and maintenance costs through standardized components and simplified wiring.
Implementation Method 1
heat sink temperature sensor
Implementation Method 2
provides power to a pair of LED light sources
Implementation Method 3
LED lighting
Implementation Method 4
switch mode power supply controller
Data Source
AI summary
A switch mode power supply controller provides power to a pair of light sources. The controller includes a low voltage programmable current source and adjusting elements for independently adjusting the current to the LED light sources. The controller also includes a first communication port for receiving a communication from an external device, such as a dimmer, or from another power supply controller; and a second communication port for sending a communication to a third power supply controller. These ports provide an upstream and downstream communication capability through a chain of controllers so that input from a device can be communicated upstream and downstream.