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High Voltage, Low Current High-Power Multichannel LEDs LLC Driver by Stacking Single-Ended Rectifiers with Balancing Capacitors

School of Electronic and Electric Engineering, Daegu University, Daegudaero 201, Gyeongsan, Gyeongbuk 712714, Korea
Electronics 2020, 9(3), 529; https://doi.org/10.3390/electronics9030529
Received: 17 February 2020 / Revised: 13 March 2020 / Accepted: 20 March 2020 / Published: 23 March 2020
(This article belongs to the Section Power Electronics)
In this paper, a new LLC converter for series-connected, high-voltage LEDs is proposed. The proposed LLC converter consists of two stacked, single-ended rectifiers and one balancing capacitor, to compensate for the current deviation of two individual LED strings. The proposed LLC LED driver can use a diode with low voltage stress, even if the secondary LED is connected in series to have a high driving voltage. In addition, even if several series-connected LEDs are changed into two-stacked structures, the balancing capacitor can compensate for the current deviation of the two separated LEDs, as well as the difference in leakage inductance of the two stacked single-ended rectifiers. The balancing capacitor can be made equal to the voltage tolerance of the stacked, single-ended rectifier diodes. The proposed circuit can be easily extended to a series channel LED driver circuit, without increasing the voltage stress. To verify the characteristics and operation of the proposed LLC LED driver, a 260W high-power LED driver is implemented. View Full-Text
Keywords: LLC LED driver; high-power LED light; stacked single-end rectifier; balancing capacitor LLC LED driver; high-power LED light; stacked single-end rectifier; balancing capacitor
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Yi, K.H. High Voltage, Low Current High-Power Multichannel LEDs LLC Driver by Stacking Single-Ended Rectifiers with Balancing Capacitors. Electronics 2020, 9, 529.

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