Multi-Channel LED Lighting Circuit With Leakage Path Color Balancing
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Solution Overview
Problem
Existing multi-channel lighting circuits face inefficiencies and require significant calibration processes and computation power to maintain color consistency, as they are either sensitive to bus voltage variations or need LED bin data transfer and pairing with controllers.
Innovation Solution
A lighting circuit with a series connection of lighting channels, each having a current leakage path in parallel with the LED arrangement, which compensates for LED tolerances by bypassing current to equalize light output, using shunt switches for flux control without needing bin data transfer or calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If shunt switching with PWM signals is used to control multi-channel light sources, then color consistency is maintained across channels, but significant calibration processes and computation power are required to compensate for flux and color variations
Solution Approach 1:
The patent replaces complex calibration procedures and computation with simple, fixed resistor components (Radd FW, Radd Lime, Radd CW) that permanently compensate for LED variations. These resistors are inexpensive and require no adjustment, eliminating the need for calibration while maintaining color consistency across channels.
Solution Approach 2:
The patent changes the electrical parameters of the circuit by adding specific resistance values in parallel with each LED channel. This modifies the current distribution to compensate for LED bin variations, achieving flux equalization without requiring software calibration or complex control algorithms.
2Stability of the object's composition
If LED bin data transfer and controller pairing is implemented, then color consistency can be regulated, but significant additional data storage, handling and processing requirements are created
Solution Approach 1:
The patent extracts the color compensation function from the controller software and implements it directly in the hardware circuit using fixed resistors. This removes the need for LED bin data transfer, data storage, and processing, while maintaining color consistency across channels.
Solution Approach 2:
The circuit components (resistors Radd FW, Radd Lime, Radd CW) automatically compensate for LED variations without requiring external control or data processing. The system self-regulates color consistency through the inherent electrical characteristics of the added resistors, eliminating the need for controller intervention.
3Stability of the object's composition
If calibration measurements are performed to compensate for LED variations, then color consistency is achieved, but the process becomes costly
Solution Approach 1:
The patent performs compensation action during the manufacturing stage by adding fixed resistors to each channel, rather than requiring post-manufacturing calibration measurements. This preliminary hardware compensation eliminates costly calibration processes while ensuring color consistency from the outset.
4Adaptability or versatility
If voltage bus control with series resistors is used, then L2 board can be replaced independently, but the circuit becomes less efficient and sensitive to bus voltage variations
Solution Approach 1:
The patent copies the successful compensation approach from voltage-driven circuits (using resistors) and applies it to current-driven circuits. By adding parallel resistors (Radd FW, Radd Lime, Radd CW) to each channel, it achieves the same flux equalization effect while maintaining current-driven efficiency and reducing sensitivity to voltage variations.
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 solution ensures energy-efficient operation with maintained color consistency across channels, eliminating the need for calibration and reducing light output deviations, allowing independent replacement of L2 boards and shared shunt switches.
Implementation Method 1
each current leakage path (Radd FW, Radd Lime, Radd CW) is arranged to bypass a current from the corresponding LED arrangement (12, 14, 16)
Data Source
AI summary
A lighting circuit has a series connection of a plurality of lighting channels of different output colors, driven by a current source. Some or all of the lighting channels comprise a LED arrangement, a shunt switch in parallel with the LED arrangement and a current leakage path in parallel with the LED arrangement. The current leakage path is used to calibrate the current flowing through the LED arrangement and thereby take account of the LED characteristics.