Multi-channel constant current (MC&lt;sup&gt;3&lt;/sup&gt;) LLC resonant LED driver

Wu, Haoran; Ji, Shu; Lee, Fred C.; Wu, Xinke

doi:10.1109/ecce.2011.6064111

Cited by 25 publications

(13 citation statements)

References 9 publications

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“…Furthermore, a constant current output is more important in this project because the lumen output affects the bit error rate (BER) of the system. In this case, it is necessary to operate the converter in constant current output and design it based on the current gain M i and LED small-signal characteristics, as discussed in [28]. The normalized LLC current gain characteristic with an LED load is derived in [28], which is used to design the resonant tank in an LLC converter.…”

Section: A Llc Converter With Constant Current Outputmentioning

confidence: 99%

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

Zhao

Trescases

2014

IEEE Trans. Power Electron.

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This study presents a digitally controlled LLC resonant dc-dc converter targeted to white LED luminaires in smart buildings. The module uses the LED array both for ambient lighting and for transmitting sensor data. Visible light communication is implemented with minimal incremental cost, by operating the LLC converter in burst mode, without causing any visible disturbance. The converter operates with a regulated average LED current, while the burst pulse timing is controlled to minimize the current disturbance and reduce the output capacitance. Variable pulse position modulation is used to modulate the data, while supporting a range of dimming settings. A digital demodulation scheme that supports variable frequency transmission is demonstrated. The 80 W, 340-400 to 23 V converter prototype has an efficiency of 95.1%. The bit error rate of the complete system is fully characterized versus distance and angle.

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Section: A Llc Converter With Constant Current Outputmentioning

confidence: 99%

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

Zhao

Trescases

2014

IEEE Trans. Power Electron.

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“…The prior circuits have many reactive components to make an LCL-T resonance rectifier or LCLC series-parallel resonance for the current balancing of LED strings. In addition, some multichannel LED drivers based on the LLC resonant converter have been studied [16][17][18]. One study [16,17] offers a two-stage, multi-channel, constant current (MC3) LLC LED.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, some multichannel LED drivers based on the LLC resonant converter have been studied [16][17][18]. One study [16,17] offers a two-stage, multi-channel, constant current (MC3) LLC LED. The current balancing is ensured by transformers that are connected in series at the output of the resonant tank, but the circuit separates the LED modules through a transformer, and it is difficult to balance the current between the modules.…”

Section: Introductionmentioning

confidence: 99%

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

2020

Electronics

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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.

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“…Fig. 1(a) shows an AC/DC stage which generates a single common output bus V o that is shared by all the LED strings [14], [23]- [26], whereas Fig. 1(b) shows an AC/DC stage which assigns a separate output voltage for each LED string [15], [27], [28].…”

mentioning

confidence: 99%

“…In order to perform a power loss analysis, a non-ideal circuit simulation model, which includes the parasitic resistance, inductance and capacitance for the major components, has been created for the proposed single-stage AC/DC SIMO LED driver topology as well as the two prior arts, namely the conventional two-stage AC/DC LED driver (with three post-regulators) [14], [23]- [26] and the two-stage AC/DC SIMO LED driver [39], [40] for comparison purpose. Based on the simulation results, the total power loss and the power efficiency in each of the three topologies have been compared and tabulated in Table I.…”

mentioning

confidence: 99%

Single-Stage AC/DC Single-Inductor Multiple-Output LED Drivers

Guo

Lee

et al. 2016

IEEE Trans. Power Electron.

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Abstract-Various AC/DC LED driver topologies have been proposed to meet the challenges of achieving a compact, efficient, low-cost and robust multi-string LED lighting system. These LED drivers typically employ a two-stage topology to realize the functions of AC/DC rectification and independent current control of each LED string. The choice of having two stage conversions involves additional hardware components and a more complicated controller design process. Such two-stage topologies suffer from a higher system cost, increased power loss, and large form factor. In this paper, a single-stage AC/DC single-inductor multiple-output (SIMO) LED driver is proposed. It uses only one single inductor and N+1 active power switches (N being the number of LED strings) with reduced component count and smaller form factor. The proposed driver can achieve both functions of AC/DC rectification with a high power factor and precise independent current control of each individual LED string simultaneously. A prototype of an AC/DC single-inductor triple-output (SITO) LED driver is constructed for verification. Experimental results corroborate that precise and independent current regulation of each individual LED string is achievable with the proposed driver. A power factor of above 0.99 and a peak efficiency of 89% at 30 W rated output power are attainable.

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Multi-channel constant current (MC<sup>3</sup>) LLC resonant LED driver

Cited by 25 publications

References 9 publications

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

Burst-Mode Resonant LLC Converter for an LED Luminaire With Integrated Visible Light Communication for Smart Buildings

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

Single-Stage AC/DC Single-Inductor Multiple-Output LED Drivers

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