Design of a Soft-Switching Asymmetrical Half-Bridge Converter as Second Stage of an LED Driver for Street Lighting Application

Arias, Manuel; Lamar, Diego G.; Linera, F.F.; Balocco, D.; Diallo, A.; Sebastián, J.

doi:10.1109/tpel.2011.2164942

Cited by 140 publications

(79 citation statements)

References 23 publications

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“…The difference in error value is calculated in (8) and then substituted to (9). If the reference from which the calculated error is subtracted is inputted to the converter having a larger output voltage, the voltages of the two converters have the same output voltage.…”

Section: Problem Improvement Of Converter Output Voltagementioning

confidence: 99%

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Performance Improvement of Isolated High Voltage Full Bridge Converter Using Voltage Doubler

Lee¹,

Shin²,

Hong³

et al. 2014

Journal of Electrical Engineering and Technology

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-The performance of an isolated high voltage full bridge converter is improved using a voltage doubler. In a conventional high voltage full bridge converter, the diode of the transformer secondary voltage undergoes a voltage spike due to the leakage inductance of the transformer and the resonance occurring with the parasitic capacitance of the diode. In addition, in the phase shift control, conduction loss largely increases from the freewheeling mode because of the circulating current. The efficiency of the converter is thus reduced. However, in the proposed converter, the high voltage dual converter consists of a voltage doubler because the circulating current of the converter is reduced to increase efficiency. On the other hand, in the proposed converter, an input current is distributed when using parallel input / serial output and the output voltage can be doubled. However, the voltages in the 2 serial DC links might be unbalanced due to line impedance, passive and active components impedance, and sensor error. Considering these problems, DC injection is performed due to the complementary operations of half bridge inverters as well as the disadvantage of the unbalance in the DC link. Therefore, the serial output of the converter needs to control the balance of the algorithm. In this paper, the performance of the conventional converter is improved and a balance control algorithm is proposed for the proposed converter. Also, the system of the 1.5[kW] PCS is verified through an experiment examining the operation and stability.

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Section: Problem Improvement Of Converter Output Voltagementioning

confidence: 99%

“…Particularly, it is very useful for composing a voltage boosting type of power supply. The representative voltage boosting types of power supply are push-pull [7], half bridge [8], and full bridge converters. The push-pull and half bridge converters can more easily reduce the semiconductor than general full bridge converters.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of Isolated High Voltage Full Bridge Converter Using Voltage Doubler

Lee¹,

Shin²,

Hong³

et al. 2014

Journal of Electrical Engineering and Technology

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“…If galvanic isolation is achieved in the first stage, flyback family converters [45,46] are the most suitable option. Common isolated second stages are HB LLC resonant converter [51][52][53][54], Asymmetrical HB (AHB) [55,56], flyback family [50,57,58], etc. Non-isolated topologies for the second stage are buck [59], TIBuck [60][61][62][63][64][65] (taking advantage of the possibility of two isolated outputs in the first stage) or any other non-isolated topology.…”

Section: Two-stage Switching Topologiesmentioning

confidence: 99%

“…21. The idea is that each stage is responsible for just one task [54,59]. In this way, the first stage would provide the PF correction, the second stage would provide the galvanic isolation and the third stage would regulate the output current.…”

Section: Three-stage Switching Topologiesmentioning

confidence: 99%

An Overview of the AC-DC and DC-DC Converters for LED Lighting Applications

2012

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Original scientific paperHigh-Brightness Light Emitting Diodes (HB-LEDs) are considered the future trend in lighting not only due to their high efficiency and high reliability, but also due to their other outstanding characteristics: chromatic variety, shock and vibration resistance, etc. Nevertheless, they need the development of new power supplies especially designed for boosting and taking advantage of their aforementioned characteristics. Besides, their behaviour is completely different from the rest of lighting devices and, consequently, it should be also taken into account in the design of the converters used to drive them. As a result, many well-known topologies have been optimized or redesigned in order to be used in LED-lighting applications and many new topologies have come up in the recent years with the same purpose.In this paper, the main HB-LED characteristics will be explained, highlighting how they influence the design of their power supplies. After, the main topologies will be presented from the simplest to the most complex ones, analysing their advantages and disadvantages. Key words: AC-DC converters, DC-DC converters, LED, LightingPregled AC-DC i DC-DC pretvarača za primjene u LED rasvjeti. Svjetleće diode s visokom razinom svjetline (HB-LED) smatraju se budućim trendom u rasvjeti zahvaljujući ne samo visokom stupnju efikasnosti i pouzdanosti, nego i njihovim izvanrednim svojstvima: raznolikost boja, otpornost na udarce i vibracije i sl. Ipak, s ciljem potpunog iskorištenja prethodno spomenutih svojstava, potrebno je razviti nove, posebno osmišljene izvore napajanja. Osim toga, ponašanje im se posve razlikuje od ostalih tipova rasvjete što je potrebno uzeti u obzir pri projektiranju pretvarača za njihovo napajanje. Kao posljedica toga, mnoge su poznate topologije pretvarača optimirane ili preoblikovane posebno za primjenu u LED rasvjeti, a zadnjih nekoliko godina mnoge nove su se tek pojavile.U ovomčlanku objašnjena su osnovna HB-LED svojstva naglašavajući njihov utjecaj na razvoj izvora napajanja. Uz to, prikazane su osnovne topologije, od najjednostavnijih do najsloženijih, ujedno analizirajući prednosti i nedostatke pojedinih.

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“…The delays (i.e., dead times) that have to be introduced in the control signals of the AHBC's MOSFETs in order to achieve Zero-Voltage Switching (ZVS) are not equal and change depending on the operating point of the converter [29]. Therefore, digital control is highly recommendable in this converter as it can be used for dynamically calculating the necessary delays for each situation (increasing its efficiency).…”

Section: Introductionmentioning

confidence: 99%

Digital Implementation of the Feedforward Loop of the Asymmetrical Half-Bridge Converter for LED Lighting Applications

Arias

Díaz

Cadierno

et al. 2015

IEEE J. Emerg. Sel. Topics Power Electron.

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Abstract.-The Asymmetrical Half Bridge converter (AHBC) has proven to be a promising candidate for LED lighting applications. It provides high efficiency, galvanic isolation and it can be easily built without electrolytic capacitor. On the other hand, its main drawback is its poor attainable bandwidth. In any two-stage ac-dc LED driver based on the AHBC, the first stage is a Power Factor Corrector (PFC) converter which has to be also implemented without electrolytic capacitor. As a consequence, its output voltage (input voltage of the AHBC) presents a low-frequency ripple. Due to the poor bandwidth of the AHBC, this voltage ripple will be transferred to the converter output voltage, leading to flickering. Due to the complex and non-linear transfer function of the AHBC, any analog feedforward loop has to be tuned for a given operating point, leading to a poor performance when the AHBC moves away from that point. In this paper, a digital feedforward loop is proposed in order to solve this problem. The digital implementation allows the feedforward loop to perfectly cancel the ripple under any condition (e.g., output voltage variation due to dimming). Besides, this digital feedforward loop has been designed and simplified considering the specific purpose of cancelling flickering in the emitted light. In this way, it can be easily implemented in small-size microcontrollers. Experimental results with a 40-W prototype prove the usefulness of the proposed feedforward loop.

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Design of a Soft-Switching Asymmetrical Half-Bridge Converter as Second Stage of an LED Driver for Street Lighting Application

Cited by 140 publications

References 23 publications

Performance Improvement of Isolated High Voltage Full Bridge Converter Using Voltage Doubler

Performance Improvement of Isolated High Voltage Full Bridge Converter Using Voltage Doubler

An Overview of the AC-DC and DC-DC Converters for LED Lighting Applications

Digital Implementation of the Feedforward Loop of the Asymmetrical Half-Bridge Converter for LED Lighting Applications

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