Parallel LED Driver Loops for High-Temperature Reliability
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Solution Overview
Problem
The reliability of constant current drivers for LED light sources is low due to the frequent malfunction of semiconductor devices caused by high temperatures, leading to high maintenance costs and operational disruptions, especially in critical applications like tunnels and roads.
Innovation Solution
A constant current driver with a main power supply loop and a backup power supply loop, where both loops include power conversion circuits that operate in parallel, ensuring that if one loop fails, the other can maintain normal operation of the LED light source, thereby improving reliability and reducing maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single constant current driver is used for LED light source, then the device complexity is low, but the reliability is low due to high failure rate of semiconductor devices in high-temperature environment
Solution Approach 1:
The constant current driver is segmented into multiple independent power supply loops (main loop and backup loop), where each loop can operate independently. This segmentation allows the system to maintain functionality even when one loop fails, thereby improving reliability without requiring a complete system redesign.
Solution Approach 2:
The patent implements a backup power supply loop that serves as a pre-prepared cushion against failures. When the main power supply loop fails due to semiconductor device invalidation in high-temperature environment, the backup loop is already in place and can immediately take over, providing beforehand cushioning against reliability issues.
2Reliability
If multiple power supply loops are used to improve reliability, then the reliability improves, but the device complexity and production cost increase
Solution Approach 1:
Multiple power supply loops share common components such as the LED light source, control circuitry, and housing structure. This merging approach allows the system to achieve improved reliability through redundancy while avoiding the full cost of completely separate systems, as shared components reduce overall production complexity and cost.
3Reliability
If power conversion circuits operate in parallel to ensure continuous operation, then the reliability improves, but the device complexity increases
Solution Approach 1:
The power conversion circuits are configured in parallel with preliminary action taken to establish independent main and backup loops before operation begins. This preliminary configuration ensures that when one circuit fails, the other is already prepared and connected to maintain continuous operation, reducing the complexity of failure response while improving reliability.
Data Source
AI summary
Disclosed is a constant current drive for an LED light source, including a main power supply loop and at least one backup power supply loop. The main power supply loop at least includes a power conversion circuit. The power conversion circuit outputs a constant current to an LED light source. The backup power supply loop at least includes a power conversion backup circuit. The power conversion backup circuit outputs a constant current to the LED light source. When the power conversion circuit and the power conversion backup circuit operate normally, any one thereof operates in a nominal state or a derating state, and the output ends thereof are connected in parallel and then supply power to the LED light source simultaneously. When any one of the power conversion circuit and the power conversion backup circuit is invalid, the invalid circuit will not affect the normal operation of the remaining circuit. The constant current drive for an LED light source in the present invention can improve the reliability of the constant current drive for an LED light source due to having a backup power supply loop.