Light-emitting-element driving circuit with backup feedback loop
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In light-emitting-element driving circuits with voltage boosting circuits, abnormalities such as open failures in feedback loop paths can prevent suitable feedback voltage input, leading to incomplete voltage boosting and potential light emission failure in other light-emitting elements.
Innovation Solution
A light-emitting-element driving circuit with a voltage boosting circuit unit, a current circuit unit, a first feedback loop path, a backup feedback loop path, an abnormality detection circuit unit, and a switching circuit unit that switches from the first feedback loop path to the second when an abnormality is detected, ensuring continuous voltage boosting even in case of open failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single feedback loop path is used to input voltage to the voltage boosting circuit unit, then the circuit structure is simple, but when an open failure occurs in the feedback loop path, the protection function is activated and voltage boosting stops, causing light emission failure in other light-emitting elements
Solution Approach 1:
The feedback loop path is segmented into multiple independent paths (first feedback loop path and second feedback loop path). Each path can independently provide feedback voltage to the voltage boosting circuit unit, ensuring that if one path fails, the other can still maintain normal operation.
Solution Approach 2:
A backup feedback loop path is prepared in advance as a cushion against potential failures. The abnormality detection circuit continuously monitors the feedback voltage, and when an open failure is detected, the switching circuit automatically transitions to the backup path, preventing system failure before it occurs.
2Reliability
If the voltage boosting circuit unit operates continuously without abnormality detection, then the device complexity is low, but when an open failure occurs in the feedback loop path, the protection function activates and stops voltage boosting, causing light emission failure
Solution Approach 1:
The abnormality detection circuit implements continuous feedback monitoring of the feedback voltage from the feedback loop path. When the monitored voltage indicates an open failure condition, the switching circuit receives this feedback signal and automatically transitions to the backup feedback loop path, ensuring continuous voltage boosting operation.
Solution Approach 2:
The switching circuit acts as an intermediary between the feedback loop paths and the voltage boosting circuit unit. It selectively connects either the first or second feedback loop path to the voltage boosting circuit unit based on the operational status, enabling automatic failover without requiring complex control logic.
3Productivity
If no backup feedback loop path is provided, then the device complexity is minimal, but when an open failure occurs, all light-emitting elements cannot emit light due to protection function activation
Solution Approach 1:
The second feedback loop path serves as a universal backup that can take over the feedback function when the first path fails. Both paths are configured to provide the same feedback voltage signal to the voltage boosting circuit unit, ensuring that the system maintains its voltage boosting capability regardless of which path is active.
Data Source
AI summary
A light-emitting-element driving circuit is provided which comprises a voltage boosting circuit unit which supplies a boosted voltage to a light-emitting element, a current circuit unit which drives the light-emitting element with a current, a normal feedback loop path through which a voltage of the light-emitting element is input as a feedback voltage to the voltage boosting circuit unit, a backup feedback loop path through which a voltage of the light-emitting element is input as the feedback voltage to the voltage boosting circuit unit, an abnormality detection circuit unit which compares the feedback voltage which is input through the normal feedback loop path to the voltage boosting circuit unit and a predetermined determination voltage, to detect abnormality, and a switching circuit which switches from the normal feedback loop path to the backup feedback loop path when the abnormality detection circuit unit has detected the abnormality.