A single-stage electrolytic capacitor-less AC/DC LED driver

Zhang, Yiwen; Jin, Ke

doi:10.1109/peac.2014.7037975

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…From (11), the maximum and minimum frequency values can be obtained. These frequency values are of importance for the correct design of the topology: selection of the main switches, magnetics and ton.…”

Section: A Static Analysismentioning

confidence: 99%

An AC–DC PFC Single-Stage Dual Inductor Current-Fed Push–Pull for HB-LED Lighting Applications

Castro¹,

Martin²,

Vázquez³

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

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An ac-dc single-stage driver for High Brightness Light-Emitting Diodes with galvanic isolation is presented in this paper. The driver is based on a Dual Inductor Current-Fed Push-Pull converter with each inductor operating in Boundary Conduction Mode. The interleaving between the two inductors enables the converter to reduce the high input current ripple inherent to a BCM. Moreover, it is fully compliant with IEC 1000-3-2 Class C and it is able to achieve a high Power Factor. Its low component count, simplicity and overall outstanding characteristics make this current-fed topology suitable for medium power range HB-LED drivers in low cost applications. The proposed topology has been tested on a 100W prototype for the full range of the US single-phase line voltage, feeding several HB-LED strings, with an output voltage equivalent to 48V at full load. The prototype achieves a maximum efficiency of 92% with a 0.99 power factor, 8% THD at full load while guaranteeing good quality light.

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Section: A Static Analysismentioning

confidence: 99%

An AC–DC PFC Single-Stage Dual Inductor Current-Fed Push–Pull for HB-LED Lighting Applications

Castro¹,

Martin²,

Vázquez³

et al. 2018

IEEE J. Emerg. Sel. Topics Power Electron.

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“…A 3W LED driver integrated circuit is designed in this paper, which using 0.6um silicon 5V standard CMOS technology. The constant current value of the LED driver is 350mA, and the output driving current changes less than 5% when the power supply voltage changes within ± 10% or the temperature changes within the range of 0 º C to 120 º C [3] .…”

Section: Introductionmentioning

confidence: 99%

Design of LED constant current driving circuit

Cheng，,

2024

Preprint

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A 3W series LED constant current drive integrated circuit is designed in this paper. The driver can provide a constant current of 350mA for LED devices with over temperature and over voltage protection. When the power supply voltage fluctuates within ± 10%, the output driving current changes less than 5%; When the temperature of chip varies between 0 º C and 120 º C, the change in output driving current is less than 5%. The chip includes constant current drive, over temperature, and over voltage control circuits, as well as high-power driving NMOS devices. The control circuit consists of a bandgap voltage reference, an error amplifier, a sampling circuit. The bandgap voltage reference provides three reference voltages that are independent of temperature and power supply voltage; The sampling circuit and operational amplifier form a negative feedback circuit, allowing the sampling NMOS and power NMOS to operate at the same temperature and current density, so that the sampling current can more accurately reflect the changes in the output driving current of the power NMOS, and improve the control accuracy of the output driving current. By using a feedback control circuit, the sampling current tends to be constant, thereby achieving the goal of controlling the output driving current. The automatic adjustment of output current is achieved through over temperature and overvoltage circuits, which not only ensures the continuity of output current but also effectively ensures the safety of LED devices.

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“…In addition, the electrolyte may evaporate, thereby reducing the reliability of the drive system. Due to the film capacitor have benefits such as longer life and smaller in the AC-DC-AC drive system, the Electrolytic Capacitor-Less(ECL) motor drive system using a small capacity film capacitor instead of an electrolytic capacitor has attracted more and more scholars attention [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Sensorless control strategy for electrolytic capacitor-less IPMSM drive system

Zhou

Chen

Sun

et al. 2023

Preprint

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In order to solve the problems that the variables in the electrolytic capacitor-less drive system fluctuate greatly at twice the grid frequency, the observed rotor position signal is doped with harmonics, resulting in poor rotor position accuracy and large speed fluctuation. In order to improve the observation accuracy and dynamic performance of the traditional MRAS observer, a speed estimation strategy based on the improved super-twisting algorithm adaptive observer (STA-AO) is proposed for sensorless without electrolytic capacitor. This method introduces the super-twisting sliding mode algorithm into the traditional MRAS observer to replace the PI adaptive mechanism in the observer, which can improve the convergence speed of the error between the reference model output and the adjustable model output and the robustness of the observer. The simulation results show that compared with the traditional MRAS observer, the improved method improves the position observation accuracy of the observer and improves the dynamic performance and robustness of the speed estimation strategy. The experimental results verify the effectiveness of the proposed estimation method.

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A single-stage electrolytic capacitor-less AC/DC LED driver

Cited by 15 publications

References 12 publications

An AC–DC PFC Single-Stage Dual Inductor Current-Fed Push–Pull for HB-LED Lighting Applications

An AC–DC PFC Single-Stage Dual Inductor Current-Fed Push–Pull for HB-LED Lighting Applications

Design of LED constant current driving circuit

Sensorless control strategy for electrolytic capacitor-less IPMSM drive system

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