LED String Voltage Control via Bypass Circuit
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Solution Overview
Problem
LED strings experience inconsistent brightness due to varying operating voltages received by each LED apparatus, caused by line loss during voltage transmission.
Innovation Solution
The LED apparatus and string incorporate a bypass circuit mechanism that enables or disables a signal path based on the presence of a data signal, ensuring stable voltage supply by compensating voltage fluctuations and maintaining consistent current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple LED apparatuses are connected in a LED string, then the lighting coverage is extended and application scope is expanded, but line loss occurs during voltage transmission causing inconsistent operating voltages and brightness across different LED apparatuses
Solution Approach 1:
The patent divides the LED string into multiple independent control units, where each LED apparatus is controlled by separate data signals. This segmentation allows individual voltage compensation for each LED apparatus, overcoming the line loss problem by treating each LED as an independent node that can be individually adjusted rather than part of a single series circuit.
Solution Approach 2:
The control device receives feedback information about the operating status of each LED apparatus and adjusts the drive voltage dynamically. This feedback mechanism enables real-time compensation for voltage drops caused by line loss, ensuring consistent brightness across all LED apparatuses by continuously monitoring and adjusting operating parameters.
2Reliability
If drive voltage is increased to compensate for line loss, then voltage at distant LED apparatuses improves, but current consumption increases and energy efficiency decreases
Solution Approach 1:
The patent employs dynamic voltage adjustment where the drive voltage is not fixed but varies based on real-time operating conditions. The control device dynamically modifies the voltage supplied to each LED apparatus according to its specific needs and the overall system status, optimizing energy efficiency while maintaining voltage stability without continuously over-compensating.
Solution Approach 2:
The system changes operating parameters (drive voltage, current) based on feedback information to optimize performance. By adjusting these parameters dynamically rather than maintaining constant high voltage, the system achieves voltage stability for distant LEDs while minimizing unnecessary energy consumption across the entire LED string.
3Device complexity
If data signal transmission path is used for power supply, then integrated control is achieved, but voltage fluctuations during data signal transmission cause unstable power supply to LED apparatuses
Solution Approach 1:
The patent makes the data signal transmission path multi-functional by enabling it to serve both data communication and power supply functions. The same communication lines transmit both control data and electrical power, reducing the need for separate wiring while the control device manages both functions to prevent interference and maintain stability.
Solution Approach 2:
The control device acts as an intermediary that manages the dual function of the transmission path. It separates and coordinates data signal transmission with power supply, ensuring that voltage fluctuations during data transmission do not adversely affect the power stability required for LED operation, thereby reconciling the conflicting requirements of integrated control and stable power supply.
Data Source
AI summary
A LED string with stable voltage control receives a DC voltage. The LED string includes a plurality of LED apparatuses and a controller. The plurality of LED apparatuses sequentially receives a plurality of data signals externally provided by the controller through a signal path. The controller preferentially supplies power to the LED apparatus that directly receives the DC voltage via the positive voltage end, and the remaining LED apparatuses are supplied power sequentially. When the plurality of LED apparatuses does not receive the plurality of data signals, a bypass path is enabled to bypass the signal path so that no current flowing through the signal path; otherwise, when the plurality of LED apparatuses receives the plurality of data signals, the bypass path is disabled to make the plurality of data signals be transmitted through the signal path.