LED Dimming Driver Circuit Using Self-Excited RCC Topology
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Solution Overview
Problem
Conventional LED dimming driver circuits for TRIAC dimmers have complex structures and low conversion efficiency, leading to issues such as poor dimming linearity, narrow dimming range, and flickering when used with LED lamps.
Innovation Solution
The proposed LED dimming driver circuit employs a self-excited topology-driven RCC (Rectifier Circuit) that includes a rectifier circuit, filter circuit, and power conversion circuit, along with passive bleeder circuits and a power supply loop with a transformer, to regulate and convert the input voltage from a TRIAC dimmer into a stable driving current for LED loads, simplifying the circuit structure and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional peripheral circuit suitable for TRIAC dimmer is used, then compatibility with TRIAC dimmer is achieved, but the circuit structure becomes complex and conversion efficiency decreases
Solution Approach 1:
The patent employs a self-excited topology-driven RCC circuit that uses the input voltage waveform itself to trigger the switching action, eliminating the need for separate triggering circuits. The circuit automatically detects zero-crossing points of the input AC waveform and generates appropriate switching signals, thereby simplifying the overall circuit structure while maintaining TRIAC dimmer compatibility
Solution Approach 2:
The patent extracts and utilizes only the essential zero-crossing information from the input AC waveform to generate switching signals, rather than requiring complex detection and control circuits. By taking out just the zero-crossing points and using them to trigger the switching action, the circuit achieves simplified structure while maintaining full compatibility with TRIAC dimmer control
2Adaptability or versatility
If a conventional peripheral circuit suitable for TRIAC dimmer is used, then compatibility with TRIAC dimmer is achieved, but conversion efficiency becomes low
Solution Approach 1:
The patent utilizes the periodic zero-crossing characteristics of the AC input waveform to synchronize the switching action with the input waveform. By triggering switching events at each zero-crossing point, the circuit achieves efficient power conversion that is naturally synchronized with the AC cycle, minimizing energy loss while maintaining compatibility with TRIAC dimmer control
Solution Approach 2:
The patent ensures continuous and efficient power conversion by maintaining switching action throughout the AC cycle. The self-excited topology maintains continuous operation of the power conversion circuit, ensuring that energy is continuously and efficiently transferred to the LED load without interruption or significant energy loss, while remaining compatible with TRIAC dimmer control
3Adaptability or versatility
If conventional LED dimming driver circuits are used, then TRIAC dimmer compatibility is provided, but dimming performance deteriorates with poor linearity, narrow range and flickering
Solution Approach 1:
The patent incorporates feedback mechanisms that continuously monitor the output current and adjust the switching duty cycle to maintain linear dimming characteristics. The feedback loop ensures that the LED current remains proportional to the dimming control signal across the entire dimming range, eliminating flickering and achieving uniform dimming performance while maintaining TRIAC dimmer compatibility
Solution Approach 2:
The patent dynamically adjusts the switching characteristics based on the input voltage level and dimming control signal. The circuit automatically adapts its operation to different input conditions, maintaining optimal dimming performance across the full range of control signals. This dynamic adjustment capability ensures linear dimming response and prevents flickering while remaining compatible with TRIAC dimmer control
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 RCC provides a simple, cost-effective solution with high conversion efficiency, enabling nearly linear conversion of input voltage changes to output current changes, expanding the dimming range and preventing flickering by maintaining stable current delivery to the LED load.
Implementation Method 1
a rectifier circuit configured to rectify the alternating voltage from the TRIAC dimmer into a direct voltage
Implementation Method 2
a filter circuit configured to filter the direct voltage
Implementation Method 3
a power conversion circuit configured to perform power conversion on the filtered direct voltage, to filter out an alternating voltage component from the filtered direct voltage
Data Source
Figure 1~3B
Figure 4A~5
Figure 6~7
AI summary
The present disclosure provides an LED dimming driver circuit, which includes: a TRIAC dimmer configured to adjust an inputted alternating voltage; and a RCC connected to the TRIAC dimmer and configured to adjust the alternating voltage from the TRIAC dimmer to provide a driving current for an LED load.