LED Driver Based on Boost Circuit and LLC Converter

Ma, Jien; Wei, Xueye; Hu, Liang; Zhang, Junhong

doi:10.1109/access.2018.2866502

Cited by 38 publications

(29 citation statements)

References 19 publications

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“…where p s n n n  is the transformer ratio (np and ns are the number of turns of the primary and secondary coil, respectively) and RLED is the LED load. From the equivalent model, as shown in Figure 5, the well-known voltage gain of the circuit is described by Equation (4) [25][26][27]: Figure 5 shows the equivalent circuit of the LLC half-bridge converter based on the first-harmonic approximation (FHA) method, where R AC is the equivalent load resistance. There are two resonant frequencies (f r1 , f r2 ), as shown in Equations (1) and (2), for the LLC half-bridge converter [24]: Figure 5 shows the equivalent circuit of the LLC half-bridge converter based on the firstharmonic approximation (FHA) method, where RAC is the equivalent load resistance.…”

Section: Principle Operation Of Llc Resonant Convertermentioning

confidence: 99%

Section: Principle Operation Of Llc Resonant Convertermentioning

confidence: 99%

“…From the equivalent model, as shown in Figure 5, the well-known voltage gain of the circuit is described by Equation (4) [25][26][27]:…”

Section: Principle Operation Of Llc Resonant Convertermentioning

confidence: 99%

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Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability

Tung¹,

Tuyen

Huy

et al. 2019

Electronics

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This paper presents the implementation of a two-stage light-emitting diode (LED) driver based on commercial integrated circuits (IC). The presented LED driver circuit topology, which is designed to drive a 150 W LED module, consists of two stages: AC-DC power factor correction (PFC) stage and DC/DC power converter stage. The implementation of the PFC stage uses IC NCP1608, which uses the critical conduction mode to guarantee a unity input power factor with a wide range of input voltages. The DC/DC power converter with soft-switching characteristics for the entire load range uses IC FLS2100XS. Furthermore, the design of an electromagnetic interference (EMI) filter for the LED driver and the dimming control circuit are discussed in detail. The hardware prototype, an LED lighting system, with a rated power of 150 W/32 V from a nominal 220 V/50 Hz AC voltage supply was tested to show the effectiveness of the design. The presented LED driver was tested for street lighting, and the experimental results show that the power factor (PF) was higher than 0.97, the total harmonics distortion (THD) was lower than 7%, and the efficiency was 91.7% at full load. The results prove that the performance of the presented LED driver complies with the standards: IEC61000-3-2 and CIRSP 15:2009. Electronics 2020, 9, 52 2 of 22There are three types of LED driver systems: Single-stage [10,11], two-stage [12][13][14], and integrated LED drivers [15,16]. The single-stage LED driver is an AC/DC converter that provides a constant output current for the LED and a unity power factor. The two-stage system consists of two separate stages, an AC/DC power factor correction (PFC) converter and a DC/DC converter. Recently, some integrated topologies were introduced in order to reduce the size and cost. Single-stage and integrated solutions have some advantages such as low-cost designs and high efficiency due to only one energy conversion. However, the PFC of these topologies causes a high-output voltage ripple due to the absence of electrolytic capacitors. Hence, the low-frequency current ripple makes LEDs flicker. These single-stage and integrated solutions are not suitable LED street lighting systems and are instead used for LED-based replacement lamps where small-size converters are needed. Furthermore, the bridgeless topologies usually generate high electromagnetic interference (EMI) due to large dv/dt and di/dt. The two-stage topology is the most popular topology for LED drivers above 100 W [17]. In the two-stage LED driver, the constant output current regulation is more easily implemented due to the bus voltage. Additionally, an isolated DC-DC stage is needed in the LED driver in order to ensure constant current control.Recently, there have been several commercial analog integrated circuits (ICs) available on the market that are recommended for a high power factor and low cost with a high efficiency. These commercial ICs fulfil the IEC 1000-3-2 Class C, but the total harmonics distortion (THD) is higher than 20% [18]. In reference [19], a reson...

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Section: Principle Operation Of Llc Resonant Convertermentioning

confidence: 99%

Section: Principle Operation Of Llc Resonant Convertermentioning

confidence: 99%

See 1 more Smart Citation

Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability

Tung¹,

Tuyen

Huy

et al. 2019

Electronics

View full text Add to dashboard Cite

show abstract

“…Recently, in order to comply with the more stringent regulations such as IEC61000-3-2 class C, an additional alternating current-to-direct current (ac/dc) conversion stage is required to cascade in front of the dc/dc converter to perform the function of the power factor correction (PFC). For the sake of reducing circuit costs, many single-stage circuits have been developed for driving LEDs by integrating a PFC converter into the original LED driver [10][11][12][13][14][15]. Although these single-stage approaches can achieve a high power factor and low total current harmonic distortion (THDi), one or more active switches in these single-stage circuits still suffer from the hard switching problem.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, an LED driver with dimming capability is needed in many applications. Some single-stage approaches are derived by integration of a boost and a half-bridge resonant converter [14,15]. The half-bridge converters usually use an inductor-inductor-capacitor (LLC) or a capacitor-inductor-capacitor-inductor (CLCL) resonant tank to achieve ZVS.…”

Section: Introductionmentioning

confidence: 99%

A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter

et al. 2020

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This paper proposes a dimmable light-emitting diode (LED) driver featuring a high power factor and zero-voltage switching on (ZVS). The circuit is obtained by integrating a boost converter and a dc-dc converter with half-bridge topology. The high power factor is achieved by operating the boost converter in discontinuous current mode (DCM). The LEDs are dimmed by the control scheme of asymmetrical pulse-width modulation (ASPWM). The developed circuit eliminates the inherited dc-offset current of the transformer in a conventional asymmetrical half-bridge converter by introducing a balance capacitor. Both active switches can operate at ZVS by freewheeling the boost inductor current and the transformer magnetizing current to discharge the energy stored in their parasitic capacitance. The circuit operation is analyzed in detailed, and mathematical equations are derived. Finally, a 115-W prototype circuit for driving high brightness LEDs was built and tested. The experimental results verify the feasibility of the proposed LED driver with satisfactory performance. It can achieve a high power factor and ZVS operation.

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Quasi‐constant bus voltage CrCM boost PFC fed LLC resonant converter in high power LED lighting systems

Pal

Singh

Shrivastava

2021

Circuit Theory & Apps

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This paper deals with a two-stage LED (light emitting diode) driver on the basis of front-end boost converter operating in critical conduction mode (CrCM) and second stage LLC resonant converter for driving an LED lighting load. The boost converter operates in the valley switching mode to reduce switching power loss with less component stress. The ZVS (zero voltage switching) operation of both the half-bridge semiconductor switching devices reduces the switching losses, which improves the system efficiency. Moreover, to ensure the stability of the DC-bus voltage, state-space analysis is also carried out for the CrCM boost converter. The first stage provides the power factor correction (PFC) over the universal AC mains and maintains a constant DC-bus for the next stage. The second-stage converter maintains a ripple-free output voltage to an LED load. This circuit has reasonably minimized the design complexity as compared with single-stage variable DC-bus PFC integrated resonant converters and also gives improved efficiency in an isolated configuration. In order to validate the system, a 150-W prototype is investigated, and experimental findings are analyzed in-line with theoretical results at universal AC mains.

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LED Driver Based on Boost Circuit and LLC Converter

Cited by 38 publications

References 19 publications

Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability

Design and Implementation of 150 W AC/DC LED Driver with Unity Power Factor, Low THD, and Dimming Capability

A High-Power-Factor Dimmable LED Driver with Integrated Boost Converter and Half-Bridge-Topology Converter

Quasi‐constant bus voltage CrCM boost PFC fed LLC resonant converter in high power LED lighting systems

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