研究目的
Introducing a family of offline bridgeless quasi-resonant LED drivers with capacitive isolation feature, inherent low line-current distortion, and high power factor.
研究成果
The introduced family of bridgeless and single-switch quasi-resonant LED drivers achieves inherently resistive input characteristic, resulting in low line-current harmonic content and high power factor. The topology also realizes capacitive isolation barrier and achieves zero-voltage switching turn-off and zero-current turn-on, making it suitable for high-efficiency LED lighting applications.
研究不足
The proposed topologies are more suitable for 110-V ac input due to relatively high-voltage stress. The efficiency may be raised by approximately 5% with synchronous rectification, but this increases complexity and cost.
1：Experimental Design and Method Selection:
The study introduces a family of bridgeless quasi-resonant LED drivers (BL-QRLEDD) with capacitive isolation. The design rationale includes the use of a full-wave totem-pole-type bridgeless rectifier and a pair of small series capacitors for energy storage and transfer.
2：Sample Selection and Data Sources:
A 30-W prototype was built and tested to validate the concept, operating in the range of 150–200 kHz with a 30-V dc output.
3：List of Experimental Equipment and Materials:
The prototype includes components such as input inductor Li, resonant inductor Lr, capacitors Cs and CLED, and a series string of LEDs.
4：Experimental Procedures and Operational Workflow:
The operation involves charging the input inductor Li from the rectified line voltage during the switch ON state, resonating Lr with Cs, and transferring energy to the output capacitor CLED during the switch OFF state.
5：Data Analysis Methods:
The performance was evaluated based on line-current distortion, power factor, and efficiency measurements.
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