LED Lamp Voltage Control to Reduce Switch Heat Loss
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Solution Overview
Problem
Conventional LED lamp systems face inefficiencies due to heat dissipation caused by high voltage application in nodes with small LED forward voltage drops, leading to reduced efficiency and potential damage to switches.
Innovation Solution
A processor-controlled lamp system that measures and monitors voltages across LEDs, sets a margin value based on maximum values, generates a control table for power adjustments, and applies hysteresis to stabilize power delivery, while considering temperature changes and voltage deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving power is supplied based on the largest forward voltage to ensure all LEDs operate, then all light sources can be driven, but high voltage is applied to switch terminals causing heat dissipation and reduced efficiency
Solution Approach 1:
The patent segments the LED array into multiple groups with different forward voltage characteristics. By measuring and identifying LEDs with similar forward voltage values, the system divides them into distinct segments that can be driven independently with optimized voltage levels, preventing excessive voltage application to individual LEDs while ensuring all groups operate reliably
Solution Approach 2:
The patent dynamically adjusts driving voltage parameters based on measured LED forward voltage characteristics. By changing the voltage parameter according to the specific LED group being driven rather than using a fixed maximum voltage for all LEDs, the system optimizes power efficiency while maintaining operational reliability across different LED segments
2Illumination intensity
If high voltage is applied to ensure adequate current flow to LEDs, then sufficient light output is achieved, but heat is generated at the switch terminal reducing system efficiency
Solution Approach 1:
The patent adjusts the voltage parameter dynamically based on the specific LED group's forward voltage requirements. By matching the driving voltage to the actual LED characteristics rather than applying excessive voltage, the system achieves sufficient current flow for adequate light output while minimizing voltage drop across the switch and reducing heat generation at the terminal
3Device complexity
If a fixed power supply is used for all LEDs to simplify the circuit, then circuit complexity is reduced, but voltage deviation causes inefficient power supply and heat loss
Solution Approach 1:
The patent segments the LED population into groups based on measured forward voltage characteristics. Each segment is assigned a dedicated driving voltage level that matches its specific requirements, eliminating the need for a single complex adjustable power supply while optimizing power delivery to each group and reducing overall power loss
Solution Approach 2:
The patent performs preliminary measurement and classification of LED forward voltage values before operation. By pre-segmenting the LEDs into voltage-matched groups and assigning appropriate driving voltages in advance, the system eliminates the need for complex real-time adjustment mechanisms while achieving efficient power supply and minimizing energy loss
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 system minimizes heat generation and stabilizes power delivery, enhancing efficiency and safety by optimizing power distribution to LEDs, thereby increasing light output intensity.
Implementation Method 1
measuring a voltage between a plurality of light sources, and extracting a maximum value of the voltages
Implementation Method 2
a light source array module including a light source
Implementation Method 3
A light source array module including a light source, among light sources, connected in parallel with the driving power
Implementation Method 4
a switch connected in series with the light source to control an operation of the light source
Data Source
AI summary
A lamp system is provided. The lamp system includes: a light source driver module to provide driving power, a light source array module including a light source, among light sources, connected in parallel with the driving power, a switch connected in series with the light source to control an operation of the light source; and a processor to control the switch, control the light source driver module to provide the driving power, and control the driving power based on a voltage across at least some of the light sources.