Primary Side Constant Power Control Scheme for LED Drivers Compatible with TRIAC Dimmers

Zhang, Junming; Jiang, Ting; Xu, Lianghui; Wu, Xinke

doi:10.6113/jpe.2013.13.4.609

Cited by 14 publications

(3 citation statements)

References 21 publications

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“…As shown in Fig. 15, the measured results of PF and THD also satisfy the global standards for 190 V < V s < 250 V [40]- [41] and are superior to those of conventional LED drivers [13], [20]- [23]. All the measurement results for different source voltages are summarized in Table II. V. CONCLUSION…”

Section: B Led Power Regulation Pf and Thdmentioning

confidence: 71%

Long-Lasting and Highly Efficient TRIAC Dimming LED Driver with a Variable Switched Capacitor

Lee¹,

Choi²,

Nguyen³

et al. 2016

Journal of Power Electronics

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A triode for alternating current (TRIAC) dimming light emitting diode (LED) driver, which adopts a variable switched capacitor for LED dimming and LED power regulation, is proposed in this paper. The proposed LED driver is power efficient, reliable, and long lasting because of the TRIAC switch that serves as its main switch. Similar to previous TRIAC dimmers for lamps, turn-on timing of a TRIAC switch can be controlled by a volume resistor, which modulates the equivalent capacitance of the proposed variable switched capacitor. Thus, LED power regulation against source voltage variation and LED dimming control can be achieved by the proposed LED driver while meeting the global standards for power factor (PF) and total harmonic distortion (THD). The long life and high power efficiency of the proposed LED driver make it appropriate for industrial lighting applications, such as those for streets, factories, parking garages, and emergency stairs. The detailed analysis of the proposed LED driver and its design procedure are presented in this paper. A prototype of 80 W was fabricated and verified by experiments, which showed that the efficiency, PF, and THD at V s = 220 V are 93.8%, 0.95, and 22.5%, respectively; 65 W of LED dimming control was achieved with the volume resistor, and the LED power variation was well mitigated below 3.75% for 190 V < V s < 250 V.

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Section: B Led Power Regulation Pf and Thdmentioning

confidence: 71%

Long-Lasting and Highly Efficient TRIAC Dimming LED Driver with a Variable Switched Capacitor

Lee¹,

Choi²,

Nguyen³

et al. 2016

Journal of Power Electronics

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show abstract

“…In recent years, the primary-side-regulated (PSR) flyback converter has been increasingly drawing the attention of researchers because of its elimination of the optocoupler and feedback loop at the output terminal [1,2]. The elimination of the optocoupler and feedback loop would provide significant advantages such as cost reduction, higher power density, and lower standby power loss.…”

Section: Introductionmentioning

confidence: 99%

Oscillation effect of auxiliary winding in primary side regulated flyback converter

Zhang

Qian

et al. 2016

IEEJ Transactions Elec Engng

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In the operation of a primary-side-regulated (PSR) flyback converter, oscillation of the auxiliary winding would degrade the system reliability, as this winding plays an important role. In previous works, the oscillation of the auxiliary winding was thought to be related to the oscillation of the primary winding when the switch is turned off. However, a comprehensive explanation has not been given for this phenomenon. Meanwhile, the oscillation of the auxiliary winding depends not only on the oscillation of the primary winding but also on the conducting size and the layer distribution. Based on a multi-winding model obtained from the physical dimensions, this paper derives a mathematical expression to calculate the relation, in the time domain, between the ringing of the auxiliary winding and primary winding. The analytical results would allow the magnetic windings to be analyzed and optimized because the oscillation of the auxiliary winding is expressed as a function of the winding geometry and position. Besides, the skin and proximity effects as well as the nonlinear core properties are considered in the multi-winding model. An application example is also included. Simulation and experimental results of a single-stage, 16-W PSR flyback converter are given to validate the proposed analysis.

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“…Flyback AC-DC converters with the PSR (primary-side regulation) structure are widely used in many power supply applications, including LED drivers, chargers for portable electronic equipment and off-line power supply adapters [1], [2], [3]. They have the advantages of simplicity and cost-effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Design of a High-Precision Constant Current AC-DC Converter with Inductance Compensation

Chang¹,

Yang²,

Bian³

et al. 2016

Journal of Power Electronics

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A primary-side regulation AC-DC converter operating in the PFM (Pulse Frequency Modulation) mode with a high precision output current is designed, which applies a novel inductance compensation technique to improve the precision of the output current, which reduces the bad impact of the large tolerance of the transformer primary side inductance in the same batch. In this paper, the output current is regulated by the OSC charging current, which is controlled by a CC (constant current) controller. Meanwhile, for different primary inductors, the inductance compensation module adjusts the OSC charging current finely to improve the accuracy of the output current. The operation principle and design of the CC controller and the inductance compensation module are analyzed and illustrated herein. The control chip is implemented based on a TSMC 0.35μm 5V/40V BCD process, and a 12V/1.1A prototype has been built to verify the proposed control method. The deviation of the output current is within ±3% and the variation of the output current is less than 1% when the inductances of the primary windings vary by 10%.

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Primary Side Constant Power Control Scheme for LED Drivers Compatible with TRIAC Dimmers

Cited by 14 publications

References 21 publications

Long-Lasting and Highly Efficient TRIAC Dimming LED Driver with a Variable Switched Capacitor

Long-Lasting and Highly Efficient TRIAC Dimming LED Driver with a Variable Switched Capacitor

Oscillation effect of auxiliary winding in primary side regulated flyback converter

Design of a High-Precision Constant Current AC-DC Converter with Inductance Compensation

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