LED Lamp Drive Circuit Adaptive Power Balancing
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Solution Overview
Problem
Low voltage lighting systems, particularly those using LED lamps, are prone to flicker due to the load dropping below the electronic transformer's operating threshold, leading to instability and interoperability issues with different transformers and dimmers.
Innovation Solution
An adaptive power balancing system that regulates the voltage supplied to the light source using a drive circuit with a power stage, energy storage device, and control means to selectively disable the power stage during periods of high mains voltage, ensuring the load current remains above the transformer's threshold, thereby preventing flicker and ensuring stable operation across various transformer and dimmer configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high efficiency LED lamps are used, then energy consumption is reduced, but the load drops below the electronic transformer threshold causing flicker
Solution Approach 1:
The control means periodically monitors the mains voltage waveform and selectively disables the power stage during specific portions of the AC power cycle when voltage exceeds a threshold, enabling periodic operation that maintains transformer load while preserving LED energy efficiency
Solution Approach 2:
The system dynamically adjusts the operating parameters of the power stage by disabling it during high voltage periods, changing the effective load characteristics to maintain compatibility with the electronic transformer while preserving LED efficiency
2Illumination intensity
If the power stage operates continuously, then light output is maintained, but the load drops below transformer threshold during high efficiency operation
Solution Approach 1:
The control means anticipates voltage excursions by monitoring the AC power cycle and proactively disables the power stage before voltage exceeds thresholds, preventing transformer reset conditions before they occur
Solution Approach 2:
The energy storage device maintains continuous power delivery to the LED light source even when the power stage is disabled, ensuring uninterrupted light output while the power stage is selectively deactivated to maintain transformer load
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 effectively prevents flicker and ensures stable operation of LED lamps by maintaining a consistent load current above the transformer's threshold, enhancing interoperability and operational efficiency across different electronic transformer and dimmer setups.
Implementation Method 1
the energy storage device comprises a capacitor
Data Source
AI summary
A lighting system and a method are provided with an adaptive power balancing scheme which reduces or eliminates flicker by sensing the operation of a lamp that is connected to an electronic transformer and adaptively controlling the drive circuit of the lamp to prevent unexpected reset of the electronic transformer. There is provided a lamp with a light source and a drive circuit for the light source; said drive circuit has a power stage for regulating a voltage supplied to the light source, an energy storage device, and control means arranged to selectively disable the power stage. Power is provided to the light source by the energy storage device when the power stage is disabled.