研究目的
To propose and analyze an integrated buck-boost-buck type single-switch multi-string resonant LED driver with high power factor and passive current balancing.
研究成果
The proposed integrated buck-boost-buck type single-switch multi-string resonant LED driver achieves high power factor and passive current balancing with a simple control strategy and high efficiency. The experimental prototype verifies the analytical results, demonstrating good dynamic performance, current balancing, and a peak efficiency of 94.3%.
研究不足
The study focuses on a three-string LED driver as an example, and the scalability to more strings is mentioned but not extensively tested. The efficiency and performance are dependent on the careful design of circuit parameters like inductors and capacitors.
1：Experimental Design and Method Selection:
The study combines buck-boost and buck converters to achieve passive current balancing and power factor correction (PFC). It employs only one low-side connection active switch for a simple control requirement.
2：Sample Selection and Data Sources:
A three-string LED driver is taken as an example for analysis.
3：List of Experimental Equipment and Materials:
Includes an 84W high PF three-string LED driver prototype with components like power MOSFET, freewheeling diodes, output filter capacitors, input filter inductor, resonant inductor, and branch inductor.
4：Experimental Procedures and Operational Workflow:
The prototype is built and tested to verify the analytical results, including input current and voltage waveforms, power factor, harmonic currents, and efficiency.
5：Data Analysis Methods:
The study analyzes operating principle, current balancing principle, power factor analysis, voltage gain, and key circuit parameter design.
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Power MOSFET
15NM65
Active switch in the LED driver circuit.
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Freewheeling diode
ES5J
Provides a current path for inductive loads when the switch is off.
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Output filter capacitor
330μF×2
Filters the output voltage to reduce ripple.
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Input filter inductor
2.2mH
Filters the input current to reduce noise.
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Input filter capacitor
100nF
Filters the input voltage to reduce noise.
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Resonant inductor
1.5μH
Forms a resonant tank with the resonant capacitor.
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Branch inductor
560μH
Part of the buck converter in the LED driver.
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Resonant capacitor
680nF
Forms a resonant tank with the resonant inductor.
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Branch capacitor
1μF
Part of the passive current balancing circuit.
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Inductor / Bobbin
1.6mH/PQ2620
Magnetizing inductor in the LED driver.
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