LED Lamp Driver Bypass Circuit for Series String Fault Tolerance
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Solution Overview
Problem
LED lamp lighting devices connected in series face issues where a defective LED can interrupt the driving current, leading to all connected LEDs being turned off, differing from the operation of traditional bulb lamps, where a broken lamp can be illuminated separately.
Innovation Solution
The LED lamp lighting device includes a switch circuit and control switch element that allows skipping defective LEDs by controlling the electrical connection based on potential differences, ensuring a constant current or voltage is maintained, mimicking the operation of traditional bulb lamps by allowing other LEDs to remain illuminated even if one is defective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If multiple LED lamps are connected in series to achieve higher voltage operation and extended lifespan, then the overall lighting duration and efficiency are improved, but a single defective LED lamp interrupts the driving current causing all LED lamps to turn off
Solution Approach 1:
The series-connected LED lamp system is segmented into multiple independent lighting groups, each with its own parallel path. When one LED lamp fails, only its specific group is affected while other groups remain operational, dividing the system into functional segments that can operate independently.
Solution Approach 2:
A detection circuit acts as an intermediary between the power supply and LED lamp groups. This intermediary detects open errors in individual LED lamps and controls switching elements to bypass defective lamps, mediating the fault condition to prevent system-wide failure.
2Use of energy by moving object
If LED lamps are connected in series to reduce power consumption and increase shock resistance, then energy efficiency and durability are improved, but the lighting operation becomes different from traditional bulb lamps where individual lamps can be switched independently
Solution Approach 1:
The system dynamically adjusts its configuration based on operational mode. In normal operation, LED lamps are connected in series for energy efficiency. When individual lamp control is needed, the system dynamically reconfigures through switching elements to provide parallel paths, enabling flexible operational modes.
Solution Approach 2:
The switching circuit provides multiple functions: it enables both series connection for energy-efficient operation and parallel connection for independent lamp control. This multi-functional design allows the system to adapt to different operational requirements without sacrificing either energy efficiency or ease of operation.
3Device complexity
If a simple circuit configuration is used to detect LED open errors and determine LED voltage, then device complexity is reduced, but the system cannot provide independent operation of individual LED lamps like traditional bulb lamp systems
Solution Approach 1:
The detection and control functions are merged into a unified circuit architecture. The same switching elements used for voltage regulation also enable independent lamp operation, combining multiple functions into a single integrated system that maintains simplicity while providing versatility.
Data Source
AI summary
An LED lamp lighting device is connected between a first power supply terminal on a low potential side of a lamp driving power supply and a second power supply terminal on a high potential side of the lamp driving power supply, receives a driving current from the lamp driving power supply, and causes the driving current to illuminate a plurality of LED lamps connected in series.