UV LED Driver Fault Sensing for Open, Short, and Overheat States
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Solution Overview
Problem
Existing LED products face challenges in determining whether a fault is caused by the LED or another component, particularly in compact ultraviolet LED systems, making fault diagnosis difficult.
Innovation Solution
An LED driving module with a fault sensing unit that includes connection and heat sensing units to detect faults in ultraviolet LEDs, outputting distinct signals for short, open, and overheating states, allowing for accurate fault identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a separate light emitting diode and driving module are used in compact products, then portability and storage are improved, but fault diagnosis capability deteriorates
Solution Approach 1:
The patent segments the fault detection function into distinct sensing units: a connection sensing unit that detects LED connection states (open/short circuits) and a heat sensing unit that detects temperature abnormalities. This segmentation allows comprehensive fault diagnosis within the compact driving module without increasing overall product size.
Solution Approach 2:
The patent introduces fault signal output terminals as intermediaries that transmit diagnostic information from the sensing units to external systems. These terminals serve as communication bridges, enabling fault diagnosis capability in compact products by mediating between the internal sensing mechanisms and external diagnostic equipment.
2Reliability
If fault sensing units are added to detect LED faults, then fault detection capability is improved, but device complexity increases
Solution Approach 1:
The driving module is designed with multi-functional sensing units that can detect multiple fault types. The connection sensing unit detects both open circuits and short circuits, while the heat sensing unit detects temperature-related faults. This universal approach improves reliability without proportionally increasing complexity, as each sensing unit handles multiple detection tasks.
Solution Approach 2:
The patent utilizes changes in electrical parameters (voltage, current) and thermal parameters (temperature) to detect faults. By monitoring these parameter changes through the sensing units, the system achieves comprehensive fault detection capability while maintaining relatively simple circuit implementation, as parameter monitoring is inherently simpler than direct fault localization.
3Measurement precision
If connection sensing switch is controlled by LED node voltage, then fault sensing accuracy is improved, but energy consumption increases
Solution Approach 1:
The connection sensing switch is designed to be self-controlled by the voltage from the LED node itself. The sensing mechanism uses the LED's own operating voltage to trigger the switch state changes, eliminating the need for separate power sources or additional control circuits. This self-service approach maintains high sensing accuracy while minimizing energy consumption.
Solution Approach 2:
The patent applies partial action by using only the necessary portion of the LED node voltage to control the sensing switch, rather than continuously monitoring or amplifying the full voltage signal. This approach achieves sufficient fault detection accuracy without excessive energy consumption, as the sensing switch responds to voltage thresholds rather than continuously processing the entire voltage range.
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
The module effectively identifies and distinguishes between normal and faulty states of ultraviolet LEDs, facilitating quick troubleshooting and maintenance by distinguishing between LED faults and other component issues.
Implementation Method 1
a thermal resistor whose resistance varies depending on ambient temperature
Data Source
AI summary
An LED driving module is provided with an ultraviolet LED and a fault sensing unit. The fault sensing unit senses a fault of the ultraviolet LED. The fault sensing unit includes a connection sensing unit configured to sense a connection state of the ultraviolet LED. Further, the connection sensing unit outputs a fault signal through the fault signal output terminal when a fault occurs in the ultraviolet LED due to a short state or an opening state of the ultraviolet LED.