A Single-Stage High-Frequency Resonant AC/AC Converter

Luo, Quanming; Ma, Ke; He, Qingqing; Can, Zou; Zhou, Luowei

doi:10.1109/tpel.2016.2557782

Cited by 12 publications

(9 citation statements)

References 23 publications

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“…Nevertheless, the advances in LED technology have made possible the use of an ac-dc single-stage boost converter to drive high voltage LEDs [117], [118]. Otherwise, a boost integrated with a step-down dc-dc converter can be used to drive LEDs, being either a conventional [87]- [93], [177] or a bridgeless PFC boost [94]- [97]. The latter has the same operation as a conventional boost, but the low frequency diode bridge is removed in order to achieve an improvement in its efficiency.…”

Section: ) Single-stage Solutionsmentioning

confidence: 99%

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Castro

Vázquez

Arias

et al. 2019

IEEE Trans. Power Electron.

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Light-Emitting Diodes (LEDs) are coming strongly into the lighting market due to their advantages over conventional lighting solutions: energy efficient, controllable in both light and color, long lifetime, lack of a warm-up period and high power density. Some of these advantages will make LED light sources to be more than just a lightbulb, being able to transmit data, control light color, hue and intensity or even detect people in indoor environments. Nevertheless, these advantages attributed to LED capabilities are, in reality, achieved thanks to the LED driver. The present work reviews the current stateof-the-art strategies to drive LEDs from ac power grids with special emphasis into removing the most limiting component from the point of view of the lifetime, which is the electrolytic capacitor, while achieving a flicker-free performance of the light output of the LED driver. Moreover, it focuses on analyzing the required regulations, challenges and applicability of LED drivers in both single-phase and three-phase ac power grids.Note: This only applies for certified dimmable luminaires. Audible noiseLuminaire shall not emit noise above 24 dBA at 1 meter or less at the minimum output.0885-8993 (c)

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Section: ) Single-stage Solutionsmentioning

confidence: 99%

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Castro

Vázquez

Arias

et al. 2019

IEEE Trans. Power Electron.

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“…It can be seen that the input power is greater than the output power during the interval of [π/4, 3π/4]. Therefore, according to [23], the energy change during this interval can be expressed as…”

Section: Design Considerations For the Dcm Operation Boost Pfc Convermentioning

confidence: 99%

“…Also, for the DCM operation, only the output voltage is required to be regulated, and there is no need to detect the boost inductor current, so a single-loop control scheme can be achieved. Similarly, the DCM operation boost PFC converter is mostly adopted in low power applications due to its simplicity [23][24][25][26]. Based on the existing literature, there are mainly three control schemes for the DCM operation boost PFC converter: (i) constant duty cycle (CDC) control [23,24]; (ii) variable duty cycle (VDC) control [25]; and (iii) frequency control (FC) [26].…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of the DCM operation boost PFC converter with magnetic control

Wei

Luo

Wang

et al. 2019

IET Power Electronics

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In this study, a novel control scheme for the discontinuous conduction mode (DCM) operation boost power factor correction (PFC) converter is proposed. Instead of adopting constant duty cycle (CDC) control, variable duty cycle control or frequency control, the magnetic control or variable inductor control is adopted to regulate the output voltage, so CDC and switching frequency can be implemented for the switch. The operation principles of the proposed control scheme are discussed in details, and the analysis of the input current, power factor, boundary condition and design considerations are presented. In addition, the modelling of the variable inductor and the DCM operation boost PFC converter with variable inductor are derived in detail, by linearising the non-linear components, the model of the DCM operation boost PFC converter with the proposed control scheme can be obtained, and the design procedures of the PI controller are presented. Finally, a 70 W experimental prototype is built to verify the theoretical analysis and the effectiveness of the proposed control scheme.

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“…These prior research methods are not suitable for high-power, multi-channel LED driving circuits because of the large number of devices, and the need for a separate control block to eliminate the current variation between channels. Another study has proposed driving multi-channel LEDs using series resonance and parallel resonance on the secondary side or on the primary side [13][14][15]. 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.…”

Section: Introductionmentioning

confidence: 99%

“…The proposed driver can be extended for many channel LEDs by adding fewer diode components and increasing the number of secondary windings. In order to overcome the efficiency degradation and to drive multi-channel LEDs, a single power conversion driver has been studied from the PFC DC output to the LED current control [7][8][9][10][11][12][13][14][15][16][17]. The single power LED driving circuit can be divided into a conventional pulse-width modulation (PWM) DC-DC converter [7][8][9][10][11][12] and a resonant converter [13][14][15][16].…”

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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A Single-Stage High-Frequency Resonant AC/AC Converter

Cited by 12 publications

References 23 publications

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

A Review on Flicker-Free AC–DC LED Drivers for Single-Phase and Three-Phase AC Power Grids

Analysis and design of the DCM operation boost PFC converter with magnetic control

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

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