LED Lamp Driver With Detection Circuit For Current Adaptation
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Solution Overview
Problem
Existing LED lamp systems with multiple lamps connected in parallel face challenges in adapting power distribution when a lamp fails, leading to potential overheating and reduced lifespan, as they lack a mechanism to adjust current output based on the number of functional lamps.
Innovation Solution
Incorporating a detection circuit within the LED driver that measures the current flowing through each lamp and adjusts the current setting resistance to match the number of functional lamps, using a combination of resistors and transistors to dynamically adjust the output current, ensuring appropriate power distribution and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LED lamps are driven in parallel with a fixed current driver, then the system is simple and reliable, but when a lamp is removed the remaining lamps receive excessive current which reduces their lifetime
Solution Approach 1:
The patent implements a feedback mechanism where the driver circuit continuously monitors the current flowing through each LED lamp and automatically adjusts the total current output based on the number of connected lamps. This feedback loop ensures that when a lamp is removed, the driver detects the change and reduces the current to the remaining lamps, preventing overheating and extending their lifetime while maintaining system reliability.
Solution Approach 2:
The patent transforms the static fixed-current driver into a dynamic system that can adapt its current output in real-time. The driver circuit incorporates adjustable current setting resistances that can be dynamically modified based on the detected number of connected lamps, allowing the system to optimize performance and protect LED lifespan without requiring complex manual reconfiguration.
2Illumination intensity
If the driver current is increased to compensate for removed lamps, then the remaining lamps maintain brightness, but the increased current reduces the lamp lifetime and causes overheating
Solution Approach 1:
The driver circuit uses feedback from current sensors to detect when a lamp is removed and automatically adjusts the current distribution to maintain appropriate brightness levels without exceeding thermal limits. The system monitors lamp status and modulates the current output to balance illumination requirements with thermal management, preventing the runaway current increase that would otherwise occur.
Solution Approach 2:
The patent changes the electrical parameters (current magnitude) dynamically based on the operational state of the system. When lamps are removed, the driver modifies the current setting resistances to adjust the current parameter to an optimal value that maintains sufficient brightness while staying within safe thermal operating limits, thereby extending lamp lifetime.
3Adaptability or versatility
If additional elements are added to identify the number of connected lamps, then the driver can adapt power output, but the system requires pairing drivers and lamps and cannot adapt when lamps fail
Solution Approach 1:
The patent enables the driver system to self-diagnose and self-adjust by incorporating detection circuits that automatically identify the number of connected lamps without requiring external configuration or pairing information. The system performs self-testing through current measurement and automatically reconfigures the current output, eliminating the need for manual driver-lamp pairing and providing automatic adaptation when lamps are removed or fail.
Solution Approach 2:
The system uses feedback from built-in detection circuits to automatically determine the operational status and number of connected lamps. This feedback mechanism allows the driver to adapt its power output dynamically without requiring pre-configuration or external input, providing versatile power adaptation while maintaining simple system architecture.
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 solution effectively adjusts the output current to match the number of connected lamps, preventing overheating and extending the lifespan of remaining LED lamps by dynamically adjusting the resistance based on the presence or absence of each lamp, thereby ensuring safe operation and maintaining performance standards.
Implementation Method 1
The detection circuit is adapted to detect presence or absence of each of the plurality of LED lamps by measurement of a respective LED current flowing through each of the LED lamps
Implementation Method 2
a current setting resistance circuit for setting a maximum value of the LED driving current
Data Source
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AI summary
A light emitting diode (LED) apparatus is configured for driving multiple LED lamps in parallel. The light emitting diode apparatus includes at least one of the LED lamps, and a detection circuit (151, 152) that detects presence of each of the LED driver circuit (140). The LED driver circuit adjusts power and/or current to the detected LED lamps based on the detection of presence.