LED Lighting Apparatus Dual-Mode Voltage Adaptation
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Solution Overview
Problem
LED lighting apparatuses face challenges in supporting dual mode operations with rectified voltages of different rated voltages, requiring current and power regulation, uniform dimming, and reducing total harmonic distortion (THD) while maintaining stable operation with varying voltage environments.
Innovation Solution
The LED lighting apparatus includes a mode determination unit, current control unit, balancing circuits, and a current path providing circuit to dynamically adjust the operation of LED light sources based on rectified voltage peak levels, allowing for bypassing of certain light source groups and changing the connection states of LED light sources between series and parallel configurations to manage voltage and current effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LED lighting apparatus is designed to support dual mode operations with different rated voltages (120V and 277V), then the adaptability to different voltage environments is improved, but the device complexity increases due to the need for mode determination units, current control units, balancing circuits, and dynamic current path switching mechanisms
Solution Approach 1:
The patent implements dynamic switching between different operating modes (120V and 277V) by detecting the peak voltage level and automatically reconfiguring the circuit topology. The current control unit dynamically adjusts the connection states of LED light sources between series and parallel configurations, and the balancing circuits dynamically switch between different balancing levels, allowing the system to adapt to different voltage environments in real-time without manual intervention
Solution Approach 2:
The patent designs a universal LED lighting apparatus that can operate with both 120V and 277V rated voltages using the same hardware platform. The mode determination unit, current control unit, and balancing circuits serve multiple functions: they detect voltage levels, determine operating modes, control current paths, and balance voltage distribution across LED strings, enabling a single device to universally support different voltage standards
2Illumination intensity
If current regulation and uniform dimming are implemented for lower peak level rectified voltages, then the lighting quality is improved, but the device complexity increases due to the need for additional control circuits and balancing mechanisms
Solution Approach 1:
The patent applies different control strategies to different parts of the circuit based on the operating mode. In 120V mode, the system implements current regulation with specific balancing levels to achieve uniform dimming across all LED strings. In 277V mode, the system switches to power regulation with different balancing levels. Each LED string group has dedicated balancing circuits that locally adjust the voltage distribution to ensure uniform performance
Solution Approach 2:
The patent changes the operating parameters (current regulation vs. power regulation, balancing levels) based on the detected voltage mode. The current control unit adjusts the regulation parameter dynamically: using current regulation for 120V mode to achieve uniform dimming, and switching to power regulation for 277V mode. The balancing circuits also change their reference levels according to the operating mode to maintain optimal performance
3Use of energy by moving object
If power regulation is implemented for higher peak level rectified voltages, then the energy efficiency is improved, but the device complexity increases due to the need for power control mechanisms and mode-specific configurations
Solution Approach 1:
The patent implements dynamic power regulation in 277V mode by detecting the peak voltage level and switching to power control mechanisms. The current control unit dynamically adjusts the power delivery to match the higher voltage environment, and the balancing circuits dynamically reconfigure to distribute power efficiently across the LED strings, optimizing energy efficiency for high-voltage operation
4Reliability
If the LED lighting apparatus implements selective bleeding function based on operation mode, then the reliability is improved by considering dimmer operation characteristics, but the device complexity increases due to mode-dependent control logic
Solution Approach 1:
The patent implements preliminary action by pre-configuring the bleeding function based on the detected operation mode. Before the dimmer operation begins, the mode determination unit detects whether the system is in 120V or 277V mode and pre-enables the appropriate bleeding configuration. This ensures that the bleeding function is already optimized for the specific voltage environment when the dimmer starts operating, improving reliability without requiring real-time adjustments during operation
Data Source
AI summary
An LED lighting apparatus includes a first LED light source and a second LED light source included in a first light source group; a third LED light source and a fourth LED light source included in a second light source group; a mode detection circuit configured to determine a mode; a current control unit for serial and parallel connection of the first light source group and the second light source group; balancing circuits for serial and parallel connection of the respective light source groups; and a current path providing circuit for providing current paths. The LED lighting apparatus performs light emission in various states depending on the change of a rectified voltage and the change of a mode.