研究目的
To solve the double-line-frequency flicker issue in single-stage off-line LED drivers by proposing a multiplexing operation that achieves flicker-free LED driving performance.
研究成果
The proposed MRC LED driver successfully achieves flicker-free LED driving performance with reduced storage capacitor and high power factor correction. The experimental prototype demonstrates promising results with 0.95PF and only 2% lower efficiency than conventional Buck-Boost LED drivers.
研究不足
The design is specifically for low power applications (below 10W) and may not be directly scalable to higher power applications without modifications.
1：Experimental Design and Method Selection:
The design involves dividing one switching cycle into two portions (phase one and phase two) to produce a main output voltage and an opposite ripple voltage for ripple cancellation.
2：Sample Selection and Data Sources:
A 7.5W experimental prototype was built and tested to verify the design concept.
3：5W experimental prototype was built and tested to verify the design concept. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Coupled inductor, main MOSFET Q1, main output diode D1, MOSFET Q2, output diode D2, block diode D3, output capacitors Co1 and Co2, and a controller.
4：Experimental Procedures and Operational Workflow:
The prototype was tested under various input voltages to measure power factor, efficiency, and harmonic currents.
5：Data Analysis Methods:
The performance was evaluated based on power factor correction, efficiency, and harmonic content compared to standards.
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MOSFET Q1
2SK2803
Main switching component in the phase one operation.
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Main output diode D1
LQA06T300
Conducts current during the off-time of Q1 in phase one operation.
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MOSFET Q2
ZXMN4A06GTA
Main switching component in the phase two operation.
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Output diode D2
MBRS340T3G
Conducts current during the phase two operation.
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Block diode D3
MBRS340T3G
Ensures unidirectional current flow during the phase two operation.
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Output capacitor Co1
EKZN101ELL151MJ25S
Stores energy and filters the main output voltage.
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Output capacitor Co2
CL21A226KOQNNNE
Stores energy and filters the opposite ripple voltage.
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Controller
PIC16F1578-I/SS
Controls the switching operations of Q1 and Q2.
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