Triac Dimmer Compatible WLED Driving Circuit
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Solution Overview
Problem
Conventional Triac dimmers fail to provide smooth dimming performance for white LEDs due to asymmetrical AC voltage generation and lost conduction angles, resulting in flickering during the dimming process.
Innovation Solution
A Triac dimmer compatible WLED driving circuit that includes a conduction angle detection module, a conduction angle modulation module, and a conversion module to generate a pulse width modulated (PWM) low DC voltage with a regulated duty cycle, which is used to drive the WLED, reducing low frequency AC voltage ripples and ensuring stable dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional Triac dimmer is used to drive WLED, then the dimming function is achieved, but the dimming performance is unsatisfactory with flickering occurring
Solution Approach 1:
The patent introduces an electronic transformer as an intermediary device between the Triac dimmer and the WLED driver. This electronic transformer converts the asymmetrical AC voltage from the Triac dimmer into a symmetrical AC voltage, eliminating the flickering caused by voltage asymmetry while preserving the dimming function. The intermediary device isolates the WLED driver from the problematic asymmetrical voltage.
Solution Approach 2:
The patent changes the voltage parameters by introducing a voltage conversion stage that transforms the asymmetrical AC voltage into symmetrical AC voltage. By modifying the voltage waveform parameters through the electronic transformer, the system achieves stable dimming without flickering while maintaining compatibility with standard Triac dimmers.
2Ease of operation
If standard Triac dimmer circuit is used for WLED, then dimming control is provided, but asymmetrical AC voltage is generated causing performance degradation
Solution Approach 1:
The electronic transformer serves as a mediator that receives asymmetrical AC voltage from the Triac dimmer and outputs symmetrical AC voltage to the WLED driver. This intermediary transformation maintains ease of operation with standard Triac dimmers while ensuring voltage symmetry stability required for proper WLED operation.
Solution Approach 2:
The patent deliberately introduces asymmetry in the form of an electronic transformer that specifically addresses the asymmetry problem. The transformer is designed to convert asymmetrical input voltage into symmetrical output voltage, using controlled asymmetry in the transformation process to achieve symmetry in the final output.
3Productivity
If conventional driving system is applied to WLED, then basic driving function is achieved, but low frequency AC voltage ripples cause flickering
Solution Approach 1:
The electronic transformer acts as an intermediary that filters and conditions the AC voltage before it reaches the WLED driver. By placing this intermediary stage in the driving system, the patent eliminates low frequency ripples that cause flickering while maintaining the basic driving function and overall system productivity.
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 achieves smooth dimming for WLEDs with improved performance by regulating conduction angles and reducing low frequency AC voltage ripples, thereby minimizing flickering during the dimming process.
Implementation Method 1
Electronic transformer 103 receives said high AC voltage and converts it into a low AC voltage
Implementation Method 2
Rectifier 105 rectifies said low AC voltage and generates a low DC voltage
Data Source
AI summary
The present technology is generally related to Triac dimmer compatible driving circuits and methods thereof. The present technology also provides an electronic transformer that is integrated in the Traic dimmer compatible driving circuit. In one embodiment, the electronic transformer detects the conduction angles of an output AC voltage from the Triac dimmer and converts said output AC voltage into a PWM DC voltage having a duty cycle regulated by said conduction angles. Said PWM DC voltage is then applied to a WLED driver for driving a WLED.