LED Load Voltage Detection Using PFM Boost Converter
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Solution Overview
Problem
The challenge in LED lighting systems is determining the load voltage of an LED module when the native LED driver fails, as there are no industry standards for output voltage ranges, and selecting a suitable replacement driver is complicated by design differences and availability issues.
Innovation Solution
A circuit connected to the LED module, using a current sensing pulse frequency modulation (PFM) boost converter, determines the forward bias voltage by increasing voltage until a reference current is reached, allowing for measurement of the steady-state load voltage, and a smartphone or similar device interfaces with a remote database to provide compatible LED driver part numbers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If constant current LED drivers are designed with different output voltage ranges to accommodate various LED module configurations, then the adaptability of LED drivers to different LED modules is improved, but the complexity of selecting the correct replacement driver increases
Solution Approach 1:
The apparatus performs preliminary measurement of the LED module's forward bias voltage before driver selection. By measuring the actual load voltage requirement of the LED module in advance, the system determines the appropriate replacement driver model before the selection process begins, eliminating the complexity of matching drivers to modules during replacement.
Solution Approach 2:
The apparatus acts as an intermediary between the LED module and the replacement driver selection process. It measures the LED module's electrical characteristics and translates this information into driver selection criteria, serving as a bridge that simplifies the matching process between LED modules and compatible drivers.
2Ease of operation
If the LED driver output voltage range is printed on the driver cover, then the accessibility of driver information is improved, but the precision of load voltage determination deteriorates
Solution Approach 1:
The apparatus enables the LED module to self-report its actual forward bias voltage requirement through measurement. Instead of relying on printed specifications or manual estimation, the system directly measures the electrical characteristic of the LED module itself, providing precise load voltage determination independent of driver labeling information.
3Productivity
If personnel quickly access commercial data such as cost and availability of replacement drivers, then the productivity of driver replacement is improved, but the complexity of the data access system increases
Solution Approach 1:
The apparatus combines multiple functions into a single device: it measures LED module electrical characteristics, determines the appropriate driver model, and accesses commercial database information for replacement drivers. This multi-functionality integrates what would otherwise be separate tasks (measurement, identification, and information lookup) into one unified system.
Solution Approach 2:
The system uses feedback from the measured LED module characteristics to automatically query the commercial database for compatible replacement drivers. The measurement results feed into the selection logic, which then retrieves relevant commercial data including cost and availability, creating a closed-loop system that adapts its information retrieval based on actual measurements.
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
Accurately determines the load voltage and operating point of the LED module, facilitating the selection of appropriate replacement drivers and providing commercial data for available options, ensuring proper system functionality and avoiding damage or abnormal behavior.
Implementation Method 1
using a current sensing pulse frequency modulation (PFM) boost converter, determines the forward bias voltage by increasing voltage until a reference current is reached
Data Source
AI summary
The invention generally relates to LED lighting fixtures and provides apparatuses and methods for determining the forward voltage of a light emitting diode or light emitting diode array in a light fixture. An example apparatus comprises a boost converter with a user-variable forward bias current, that measures and displays the characteristics of an arbitrary LED load. Example methods according to the invention use a configurable boost converter apparatus in the field to determine the LED characteristics of an arbitrary LED module in a lighting fixture and subsequently display the results to the user. The apparatus can be part of a system that includes a link to a mobile device to transmit operating characteristics of the LED load and retrieve pertinent commercial data.