LED Lamp Power Management Reducing Shunt Switch Dissipation
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Solution Overview
Problem
LED lamp power management systems face inefficiencies and heat issues due to high power dissipation in shunt switches when operating at non-optimal color settings, leading to reduced lamp efficiency and restricted application range.
Innovation Solution
An LED lamp power management system with an LED controller that adjusts channel switch and shunt switch power based on calculated lumen fractions and duty cycles to minimize power loss, reducing power dissipation and heat generation by optimizing current flow through each LED channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the shunt switch is used to control current flow through LED sources in non-optimal color settings, then the lamp can operate at different colors, but power dissipation and heat generation increase significantly
Solution Approach 1:
The patent implements dynamic control of shunt switch resistance through a control circuit that adjusts the resistance based on operating conditions. The shunt switch transitions from a fixed low-resistance state to a dynamically adjustable resistance state, allowing the system to optimize power distribution across different LED channels while minimizing power loss in the shunt switch itself. This dynamic adjustment enables efficient operation across multiple color settings without the excessive power dissipation inherent in static shunt switch designs.
2Loss of energy
If the shunt switch resistance is reduced to minimize power loss, then power efficiency improves, but heat transfer requirements increase and space constraints are violated
Solution Approach 1:
The patent segments the power control function by introducing separate control circuits for each LED channel (red, green, blue, amber/white) in addition to the shunt switch control. This segmentation allows independent optimization of each channel's power distribution, enabling the system to minimize total power loss without requiring excessive current through any single shunt switch, thereby reducing heat generation while maintaining efficiency.
3Use of energy by moving object
If the duty cycle of one LED source is maximized to save energy in electronics, then electronic efficiency improves, but power dissipation in the shunt switch increases when other LED sources are mostly off
Solution Approach 1:
The patent changes the resistance parameter of the shunt switch dynamically based on which LED channels are active. When one LED source has a maximized duty cycle and others are mostly off, the control circuit adjusts the shunt switch resistance to minimize power loss in the shunt switch under these specific operating conditions. This parameter adjustment allows the system to maintain electronic efficiency while compensating for the increased shunt switch power dissipation that occurs when LED sources are selectively activated or deactivated.
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 system effectively reduces power loss and heat generation, enhancing the efficiency and operational range of LED lamps by dynamically adjusting power distribution across LED channels, thereby improving their performance and usability.
Implementation Method 1
significant advances in the technology of light emitting diodes (LEDs) have made LEDs attractive for use in vehicles
Implementation Method 2
The power loss at the shunt switch not only reduces lamp efficiency, but also causes heat problems. The current lost in the shunt switch is converted to heat
Data Source
AI summary
An LED lamp power management system and method including an LED lamp having an LED controller 58; a plurality of LED channels 60 operably connected to the LED controller 58, each of the plurality of LED channels 60 having a channel switch 62 in series with at least one shunted LED circuit 83, the shunted LED circuit 83 having a shunt switch 68 in parallel with an LED source 80. The LED controller 58 reduces power loss in one of the channel switch 62 and the shunt switch 68 when LED lamp electronics power loss (Ploss) exceeds an LED lamp electronics power loss limit (Plim); and each of the channel switches 62 receives a channel switch control signal 63 from the LED controller 58 and each of the shunt switches 68 receives a shunt switch control signal 69 from the LED controller 58.