A Novel Output Current Estimation and Regulation Circuit for Primary Side Controlled High Power Factor Single-Stage Flyback LED Driver

Xie, Xiaogao; Jian, Wang; Zhao, Chen; Lu, Qiang; Liu, Shirong

doi:10.1109/tpel.2012.2190523

Cited by 134 publications

(38 citation statements)

References 15 publications

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“…The flyback LED driver, shown in Figure 1.6, is an isolated buck-boost converter that utilizes the magnetizing inductance in the transformer [16,[28][29][30][31][32]. Due to its efficient switchedmode conversion and galvanically isolated output, the flyback LED driver is currently the The disadvantages of the flyback LED driver are in its size and cost.…”

Section: Flyback Led Driversmentioning

confidence: 99%

An integrated multilevel converter with sigma delta control for LED lighting

Gerber

Kline

Sanders

et al. 2017

2017 IEEE Applied Power Electronics Conference and Exposition (APEC)

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High brightness LEDs have become a mainstream lighting technology due to their efficiency, life span, and environmental benefits. As such, the lighting industry values LED drivers with low cost, small form factor, and long life span. Additional specifications that define a high quality LED driver are high efficiency, high power factor, wide-range dimming, minimal flicker, and a galvanically isolated output. The flyback LED driver is a popular topology that satisfies all these specifications, but it requires a bulky and costly flyback transformer. In addition, its passive methods for cancelling AC power ripple require electrolytic capacitors, which have been known to have life span issues. This dissertation details the design, construction, and verification of a novel LED driver that satisfies all the specifications. In addition, it does not require a flyback transformer or electrolytic capacitors, thus marking an improvement over the flyback driver on size, cost, and life span.This dissertation presents an integrated circuit (IC) LED driver, which features a pair of generalized multilevel converters that are controlled via sigma-delta modulation. The first is a multilevel rectifier responsible for power factor correction (PFC) and dimming. The PFC rectifier employs a second order sigma-delta loop to precisely control the input current harmonics and amplitude. The second is a bidirectional multilevel inverter used to cancel AC power ripple from the DC bus. This ripple-cancellation module transfers energy to and from a storage capacitor. It uses a first order sigma-delta loop with a preprogrammed waveform to swing the storage capacitor voltage. The system also contains an output stage that powers the LEDs with DC and provides for galvanic isolation. The output stage consists of an H-bridge stack that connects to the output through a small toroid transformer.The IC LED driver was simulated and prototyped on an ABCD silicon test chip. Testing and verification indicates functional performance for all the modules in the LED driver. The driver exhibits moderate efficiency at half voltage. Although the part was only testable to half voltage, loss models predict that its efficiency would be much higher at full voltage. The driver also meets specifications on the line current harmonics and ripple cancellation.This dissertation introduces multilevel circuit techniques to the IC and LED research 2 space. The prototype's functional performance indicates that integrated multilevel converters are a viable topology for lighting and other similar applications.i Dedication Dedicated to my family and friends, who have been unwavering in their love and support.ii

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Section: Flyback Led Driversmentioning

confidence: 99%

An integrated multilevel converter with sigma delta control for LED lighting

Gerber

Kline

Sanders

et al. 2017

2017 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…Consequently, a novel auxiliary-free ZCD mechanism is introduced in this paper. In BCM operation [2,5], as soon as inductor current discharge to zero, a parasitic ring between the magnetizing inductor L 0 and parasitic capacitor of LDMOS occurs and the voltage signal of V Drain drops dramatically.…”

Section: Auxiliary-free Zcd Mechanismmentioning

confidence: 99%

A novel auxiliary-free zero inductor current detection scheme for step down non-isolated LED driver

Chen

et al. 2014

IEICE Electron. Express

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A novel auxiliary-free zero crossing detection (ZCD) circuit is presented in this paper, which is especially suitable for step down nonisolated LED drivers operating in boundary conduction mode (BCM). Without extra auxiliary winding, the proposed method can fast and correctly detect zero inductor current information, which only requires an integrated NMOS power switch. The step down non-isolated LED driver with the proposed ZCD scheme has been implemented in CZ6H 0.35 um standard CMOS process, results show that the proposed ZCD scheme can always work properly regardless of the variation of line voltage and load condition.

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“…In [17]- [19], primary side current control methods based on switch peak current detection were proposed for Flyback PFC converters. These methods can achieve output current regulation and a high power factor.…”

Section: Introductionmentioning

confidence: 99%

“…The most popular industry solutions for TRIAC compatible primary side controlled LED drivers with PFC are based on a similar concept. However, the output current accuracy is affected by the internal delay time and the current rising slew rate [19]- [21]. The output current accuracy with a different delay time is also discussed in [19].…”

Section: Introductionmentioning

confidence: 99%

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

Zhang¹,

Jiang²,

Xu³

et al. 2013

Journal of Power Electronics

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This paper proposes a primary side constant power control scheme for TRIAC dimmer compatible LED drivers. The LED driver is a Flyback converter operated in boundary conduction mode (BCM) to minimize the switching loss. With the proposed control scheme, the input power of the Flyback converter can be controlled by the TRIAC dimming angle, which is not affected by AC input voltage variations. Since the output voltage is almost constant for LED loads, the output current can be changed by controlling the input power with a given conversion efficiency. The isolated feedback circuit is eliminated with the proposed primary side control scheme, which dramatically simplifies the whole circuit. In addition, the input current automatically follows the input voltage due to the BCM operation, and the resistive input characteristic can be achieved which is attractive for TRIAC dimming applications. Experimental results from a 15W prototype verify the theoretical analysis.

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A Novel Output Current Estimation and Regulation Circuit for Primary Side Controlled High Power Factor Single-Stage Flyback LED Driver

Cited by 134 publications

References 15 publications

An integrated multilevel converter with sigma delta control for LED lighting

An integrated multilevel converter with sigma delta control for LED lighting

A novel auxiliary-free zero inductor current detection scheme for step down non-isolated LED driver

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

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