High Brightness and High Voltage Dimmable LED Driver for Advanced Lighting System

Meraj, Mohammad; Rahman, Syed; Iqbal, Atif; Ben‐Brahim, Lazhar

doi:10.1109/access.2019.2928859

Cited by 14 publications

(13 citation statements)

References 18 publications

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“…Table 1 lists relevant studies on optoelectronic semiconductors with linear regulators. In the literature [7][8][9][10], light-emitting diodes (LEDs) were typically used as the light source, and bipolar junction transistors (BJT) and metal-oxide-semiconductor field-effect transistors (MOSFET) were used as the linear regulators. Only in [11] was a GaN HEMT used.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Circuit Establishments of a GaN High-Electron-Mobility Transistor and 635 nm Laser Diode for a Short-Pulsed Rising Current Simulation

Pai

Lin

2021

Processes

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In this paper, a dynamic operational linear regulator (DOLR) based on a GaN high-electron-mobility transistor (HEMT) and wide-bandwidth operational amplifier was developed and implemented. The driving current could be regulated and controlled by the DOLR for 632 nm laser diodes. The constant-current mode for the continuous-wave laser and the pulse-width modulation (PWM) mode for the short-pulsed laser were realizable using this DOLR. This study focused on the rising-edge time change on the laser driving current when the DOLR was operated under the high-frequency PWM mode, because the parasitic components on the GaN HEMT, laser diodes, printed circuit board, and power wires could influence the current’s dynamic behavior. Therefore, the equivalent circuit models of the laser diode and GaN HEMT were applied to establish a DOLR simulation circuit in order to observe the rising-edge time change on the laser driving current. A DOLR prototype was achieved, and so experimental waveform measurements could be implemented to verify the DOLR simulation and operation.

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Section: Introductionmentioning

confidence: 99%

Equivalent Circuit Establishments of a GaN High-Electron-Mobility Transistor and 635 nm Laser Diode for a Short-Pulsed Rising Current Simulation

Pai

Lin

2021

Processes

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“…With the advantages of high efficiency, fast response, wide color gamut, long lifespan and small size, high brightness light emitting diode (HB-LED) has widely substituted conventional cold-cathode fluorescent lamps and incandescent lamps [1]- [6]. As for lighting equipment, according to IEC61000-3-2 Class C, a strict requirement for input current harmonic content of power converter is established [7].…”

Section: Introductionmentioning

confidence: 99%

Flicker-Free Resonant LED Driver With High Power Factor and Passive Current Balancing

Liu

et al. 2021

IEEE Access

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A flicker-free resonant LED driver with high power factor (PF) and passive current balancing is proposed and analysed in this paper. The proposed LED driver are composed a buck power factor correction (PFC) unit and a resonant dc-dc unit by sharing an active switch. Based on this topology, the low output current ripple can be achieved via small voltage ripple on bulk capacitor and fast voltage-mode control loop. By the charge balance for resonant capacitor, the output current of each LED string can be balanced. In a half line cycle, owing to the small voltage ripple on bulk capacitor of pre-stage output, the duty cycle of active switch is almost constant. Therefore, when the inductor current of buck PFC unit operates in discontinuous conduction mode, high PF can be realized. Moreover, as the resonance is existed between resonant capacitor and leakage inductor of transformer, the diodes in resonant dc-dc unit can achieve zero-current turn-off. Thus, the efficiency can be improved. Finally, an 82W LED driver prototype with three-output is built to verify the studied results.

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“…The addition PWM dimming switch and the digital control strategy can expand the dimming range to a larger range (Huang et al, 2019;Wang et al, 2018), but the algorithm is complex and the cost is increased. A linear regulated dimmable LED using the current sense resistor, achieves dimming from 5% to 100% brightness, but the change process of LED dimming power supply current will have a certain influence on the color temperature of the LED chip (Meraj et al, 2019;Yau et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

A high-power PCCM LED driver based on GaN eHEMT with hybrid dimming modes

Lin

Zhang

et al. 2021

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Purpose The purpose of this study is to design a more flexible and larger range of the dimming circuit that achieves the independence of multiple LED strings drive and can time-multiplex the power circuit. Design/methodology/approach The state-space method is used to model the BUCK circuit working in Pseudo continuous conduction mode, analyze the frequency characteristics of the system transfer function and design the compensation network. Build a simulation platform on the Orcad PSPICE platform and verify the function of the designed circuit through the simulation results. Use Altium Designer 16 to draw the printed circuit board, complete the welding of various components and use the oscilloscope, direct current (DC) power supply and a signal generator to verify the circuit function. Findings A prototype of the proposed LED driver is fabricated and tested. The measurement results show that the switching frequency can be increased to 1 MHz, Power inductance is 2.2 µH, which is smaller than current research. The dimming ratio can be set from 10% to 100%. The proposed LED driver can output more than 48 W and achieve a peak conversion efficiency of 91%. Originality/value The proposed LED driver adopts pulse width modulation (PWM) dimming at a lower dimming ratio and adopts DC dimming at a larger dimming ratio to realize switching PWM dimming to analog dimming. The control strategy can be more precise and have a wide range of dimming.

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High Brightness and High Voltage Dimmable LED Driver for Advanced Lighting System

Cited by 14 publications

References 18 publications

Equivalent Circuit Establishments of a GaN High-Electron-Mobility Transistor and 635 nm Laser Diode for a Short-Pulsed Rising Current Simulation

Equivalent Circuit Establishments of a GaN High-Electron-Mobility Transistor and 635 nm Laser Diode for a Short-Pulsed Rising Current Simulation

Flicker-Free Resonant LED Driver With High Power Factor and Passive Current Balancing

A high-power PCCM LED driver based on GaN eHEMT with hybrid dimming modes

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