LED Driver Load Control Device Wide Output Range
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Solution Overview
Problem
Existing LED driver technologies struggle to provide a wide output range for current conducted through LED lighting loads, limiting their ability to control a variety of lighting loads with different ratings and often requiring a large number of stock keeping units (SKUs) for manufacturers.
Innovation Solution
A load control device comprising a load regulation circuit, control circuit, and filter circuit that adjusts the magnitude of the load current and filters feedback signals to achieve flicker-free intensity adjustment across a wide range, allowing for the control of LED light sources with different ratings by varying the operating frequency and filtering based on target intensity levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing LED driver technologies are used, then the device can control LED lighting loads, but the output range is limited and requires multiple SKUs for different load ratings
Solution Approach 1:
The patent implements dynamic switching between multiple operating modes (first mode for lower power ranges, second mode for higher power ranges) within a single device. The controller dynamically adjusts operation based on the LED load requirements, enabling one device to cover a wide output range from 0-100% of rated current without requiring multiple fixed SKUs for different load ratings
Solution Approach 2:
The LED driver circuit is designed with multi-functionality to handle different LED load ratings through a single universal device. By incorporating multiple operating modes and dynamic switching capabilities, the device can universally control various LED configurations (single LED, multiple LEDs in series or parallel) without requiring separate specialized drivers for each application
2Reliability
If the operating frequency is varied to adjust intensity, then flicker-free control is achieved, but the control mechanism becomes more complex
Solution Approach 1:
The patent employs feedback mechanisms where the controller monitors the actual LED current and adjusts the operating frequency accordingly to maintain flicker-free operation. The controller receives feedback about the LED load conditions and dynamically adjusts the switching frequency to ensure smooth intensity adjustment without visible flickering, while managing the complexity through automated control loops
Data Source
AI summary
A load control device (e.g., an LED driver) for controlling the intensity of a lighting load (e.g., an LED light source) may provide a wide output range and flicker-free adjustment of the intensity of the lighting load. The load control device may comprise a load regulation circuit, a control circuit, and a filter circuit (e.g., a boxcar filter circuit) that operates in a different manner in dependence upon a target current. When the intensity of the lighting load is near a low-end intensity, the control circuit may adjust an operating frequency of the load regulation circuit in response to the target current, and may control the filter circuit to filter a current feedback signal during a filter window that repeats on periodic basis. When the intensity of the lighting load is near a high-end intensity, the control circuit may control the filter circuit to constantly filter the current feedback signal.