LED Circuit Feedback Voltage Selection for Open Channel Detection
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Solution Overview
Problem
In LED circuits with multiple channels, broken or non-existent channels create open circuits, leading to a minimal output voltage feedback that can incorrectly determine the operation status, triggering unnecessary compensation mechanisms.
Innovation Solution
An LED circuit with a feedback-selecting module that includes an open detection unit to differentiate between operational and non-operational channels, and a minimum-selecting unit that compares output voltages to select the correct feedback voltage, avoiding erroneous judgments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the minimal output voltage is used as feedback voltage in LED channels with broken or non-existent channels, then the feedback voltage becomes 0, but this causes erroneous determination of LED operation status and triggers unnecessary compensation mechanisms
Solution Approach 1:
The feedback voltage selection mechanism is segmented into multiple voltage inputs corresponding to different LED channels, with each channel's output voltage being independently selected through switching elements. This segmentation allows the system to individually assess and select feedback voltage from operational channels while excluding non-operational ones, thereby maintaining reliable operation status determination without excessive complexity
Solution Approach 2:
The system performs preliminary detection of LED channel operational status by monitoring output voltages before final feedback voltage selection. The switching elements are pre-configured to connect to operational LED channels based on detected voltage levels, ensuring that the feedback voltage selection process begins with already-identified valid channels, thus avoiding erroneous 0-voltage feedback from broken channels
2Measurement precision
If all LED channels are monitored for feedback voltage selection, then the system can identify operational channels, but this increases the complexity of the feedback-selecting module
Solution Approach 1:
The open detection unit extracts and isolates the detection function for identifying non-operational LED channels, separating it from the main feedback voltage selection process. By extracting the detection logic into a dedicated unit that monitors voltage levels and controls switching elements, the system achieves precise channel status identification while keeping the overall architecture modular and manageable
Solution Approach 2:
Switching elements act as intermediaries between the LED channels and the minimum-selecting unit. These intermediaries are controlled by the open detection unit to connect only operational channels to the feedback voltage selection process, thereby mediating between the need for comprehensive channel monitoring and the desire to simplify the feedback selection mechanism by excluding non-operational channels
Data Source
AI summary
A LED circuit is provided. The LED circuit comprises: a plurality of LED channels, a driving module and a feedback-selecting module. The driving module supplies a driving voltage to the plurality of LED channels according to a feedback voltage. The feedback-selecting module comprises an open detection unit and a minimum-selecting unit. The open detection unit performs an open detection mechanism to separate the plurality of LED channels into a plurality of open LED channels and a plurality of non-open LED channels having an output voltage respectively. The minimum-selecting unit performs a selection mechanism to select a minimum output voltage as the feedback voltage from the output voltage of each of the plurality of non-open LED channels. A LED circuit operation method adapted in the LED circuit is provided herein as well.