Primary-side controller IC design for quasi-resonant flyback LED driver

Li, Ji-Shiuan; Liang, Tsorng–Juu; Chen, Kai–Hui; Lu, Yi-Ju; Li, Jhih-Sian

doi:10.1109/ecce.2015.7310406

Cited by 13 publications

(5 citation statements)

References 13 publications

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“…However, a constant frequency is not achievable for QR control, where the switching period is determined by the valley point. To satisfy the constant frequency and QR control simultaneously, a compromised method has been proposed [7]. If the switching period is smaller than the preset minimum period T s_min when the valley point is detected, the trigger-on signal is blocked and S 1 is inactivated.…”

Section: Digital Quasi-constant Frequency Controllermentioning

confidence: 99%

“…Nevertheless, the switch current will resonate owing to the parasitic component, rendering is difficult to achieve zero current switching. Therefore, quasi-resonant control is widely adopted in a DCM flyback converter [7], [8].…”

Section: Introductionmentioning

confidence: 99%

“…An improved variable on-time (VOT) control in [5] simplified the control scheme by only adding an analog divider compared with the conventional COT-controlled flyback converter. Other approaches such as constant frequency control can also be used to optimize the PF and THD [7].…”

Section: Introductionmentioning

confidence: 99%

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A Digital Power Factor Controller for Primary-Side-Regulated LED Driver

et al. 2020

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In this study, a digital primary-side controller for a flyback light-emitting diode driver with superior line regulation, high power factor (PF), and low total harmonic distortion (THD) was proposed. Conventional constant on-time control is hampered by input current distortion, leading to high THD. To achieve high PF and low THD, a digital switching frequency limiter with quasi-resonant control was proposed. In addition, owing to the turn-off delay of the MOSFET and propagation delay of the feedback signals, a primary-side-controlled flyback converter experiences poor line regulation. To achieve superior line regulation, delay compensation was proposed and analyzed. A digital controller was realized using a field-programmable gate array and was applied to an input voltage of 90-264 V ac and an output current of 1 A in a hardware prototype to verify the feasibility of the proposed control solution. The experimental results indicate that line regulation was within ±3%, PF was higher than 0.95, and THD was lower than 5% at universal input voltage.

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Section: Digital Quasi-constant Frequency Controllermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Digital Power Factor Controller for Primary-Side-Regulated LED Driver

et al. 2020

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“…The latter are due to the parasitic capacitances of the secondary circuit and to the output capacitance C out . The primary circuit capacitance includes various contributions: the output parasitic capacitance C oss of the MOSFET; the junction capacitance of the diode; the package capacitance; the intra-winding capacitance of the transformer; plus other stray contributors together and so on [47][48][49][50][51]. C oss is a strongly nonlinear capacitance and, especially in the latest MOSFET generations, it increases dramatically (100 times or more) when the drain-source voltage, v DS , falls below few tens volt; i.e., C pp is a function of v DS : C pp (v DS ).…”

Section: Switching Led Drivermentioning

confidence: 99%

Analysis of the Input Current Distortion and Guidelines for Designing High Power Factor Quasi-Resonant Flyback LED Drivers

et al. 2020

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Nowadays, LED lamps have become a widespread solution in different lighting systems due to their high brightness, efficiency, long lifespan, high reliability and environmental friendliness. The choice of a proper LED driver circuit plays an important role, especially in terms of power quality. In fact, the driver controls its own input current in addition to the LED output current, thus it must guarantee a high power factor. Among the various LED drivers available on the market, the quasi-resonant (QR) flyback topology shows interesting benefits. This paper aims at investigating and analyzing the different issues related to the input current distortion in a QR flyback LED driver. Several effects, such as the distortion caused by the ringing current, crossover distortion due to transformer leakage inductance and crossover distortion due to the input storage capacitor have been experimentally reported. These effects, not previously studied for a high power factor (Hi-PF) QR flyback, have been analyzed in depth. Finally, some practical design guidelines for a Hi-PF QR flyback driver for LED applications are provided.

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“…QR-flyback converters use the parasitic capacitance on the power switch and leakage inductance on the transformer to generate a resonant voltage when the power switch is turned off, and then the power switch can be turned on at the resonant voltage valley; therefore, soft-switching can be achieved to reduce switching losses, and electromagnetic interference can be effectively diminished. Moreover, the QR-flyback converter is an isolated SMPS because it possesses a transformer; furthermore, the QR-flyback converter can use a pulse-width modulation (PWM) control chip to correct the power factor of the input AC power; in summary, the QR-flyback converter is suitable as a driving power supply for LED array streetlamps [ 9 , 10 ]. Table 1 lists the characteristic differences between a hard-switching traditional flyback and soft-switching QR-flyback [ 7 , 8 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Development and Implementation of LED Street Lights with Bright and Extinguishable Controls and Power Converters

2023

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This study developed and implemented a driving power supply for light-emitting diode (LED) array streetlamps. The power stage was a quasi-resonant (QR)-flyback converter, its input power was the alternating-current power, and the LED array streetlamp was driven by the direct-current output power. The developed QR-flyback converter was operated in discontinuous conduction mode, and the pulse-width modulation (PWM) control chip was used to switch and conduct at the resonant valley of the drain-source voltage on the metal-oxide-semiconductor field-effect transistor (MOSFET) switch to reduce the switching loss. Moreover, the PWM control chip had a disable function, which was connected with a bright and extinguishable control circuit, and the high/low voltage level signal output by the Arduino development board can be used to control the output power of the QR-flyback converter, achieving bright and extinguishable controls for the LED array streetlamp.

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Primary-side controller IC design for quasi-resonant flyback LED driver

Cited by 13 publications

References 13 publications

A Digital Power Factor Controller for Primary-Side-Regulated LED Driver

A Digital Power Factor Controller for Primary-Side-Regulated LED Driver

Analysis of the Input Current Distortion and Guidelines for Designing High Power Factor Quasi-Resonant Flyback LED Drivers

Development and Implementation of LED Street Lights with Bright and Extinguishable Controls and Power Converters

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