Soft-switched DC/DC converter with PWM control

Oruganti, R.; Heng, Phua Chee; Tan, Kai; Liew, A.C.

doi:10.1109/intlec.1993.388500

Cited by 19 publications

(5 citation statements)

References 10 publications

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“…This also means that one of them is always turned on. As the volt·second balance in the inductive components has to be maintained, the voltages of the input capacitors of the half-bridge structure satisfy [43]:…”

Section: Analysis Of the Topologymentioning

confidence: 99%

“…Equation (44), along with r tr_i and µ i , can be used to obtain the value of φ ini and, consequently, the value of φ end according to the chosen value of ∆φ c . Г i can be calculated using φ ini , φ end , r tr_i , µ i and equations (40) and (43). This has been graphically represented in Fig.…”

Section: B Calculation Of the Inductance The Capacitance And The Tumentioning

confidence: 99%

See 1 more Smart Citation

Practical Application of the Wave-Trap Concept in Battery–Cell Equalizers

Arias

Sebastián

Hernando

et al. 2015

IEEE Trans. Power Electron.

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Abstract.-The use of battery cell equalizers is mandatory in order to assure that all the cells connected in series are charged to its maximum capacity, even when they present small differences in this parameter due to several factors, such as aging, manufacturing or temperature. Active equalizers, with a higher efficiency in comparison to passive ones, have the disadvantage of using a considerable number of components. Moreover, in the case of active equalizers with very high performance, this number can be even higher. In this paper, the use of the wave-trap concept, widely used in telecommunication systems, is studied. This concept allows the battery cell equalizer to use its switching frequency as the control variable that decides which cell is being charged. Hence, it is not necessary to use a complex system based on a high number of controlled switches in order to determine which cell is being charged. In this way, the number of switches (and the corresponding driving signals) can be strongly minimized without reducing the performance of the system. In order to proof the validity of this concept (i.e., wave traps) in the design of battery-cell equalizers, a topology based on a half-bridge structure is also proposed in this paper. It uses only two controlled switches in order to decide which cell is charged. Experimental results are provided for a 4-cell equalizer as a proof of concept.

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Section: Analysis Of the Topologymentioning

confidence: 99%

Section: B Calculation Of the Inductance The Capacitance And The Tumentioning

confidence: 99%

Practical Application of the Wave-Trap Concept in Battery–Cell Equalizers

Arias

Sebastián

Hernando

et al. 2015

IEEE Trans. Power Electron.

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show abstract

“…9) for this kind of application are the flyback family (isolated SEPIC,Ćuk and Zeta) [22][23][24], the Half-Bridge (HB) (including the asymmetrically driven one) [25][26][27][28][29] and the Push-Pull [16].…”

Section: Examples Of Typical Isolated 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 proposed igniter is contactless and powered by battery. With the advantages of microprocessor-based controllers [ 6 – 16 ], the control core of the proposed igniter is designed and implemented on a single chip PIC18F4520. Therefore, the ignition timing is programmable so as to accommodate different vehicle velocities to achieve optimal igniting.…”

Section: Introductionmentioning

confidence: 99%

Contactless Electric Igniter for Vehicle to Lower Exhaust Emission and Fuel Consumption

Shen

2014

The Scientific World Journal

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An electric igniter for engine/hybrid vehicles is presented. The igniter comprises a flyback converter, a voltage-stacked capacitor, a PIC-based controller, a differential voltage detector, and an ignition coil, of which structure is non-contact type. Since the electric igniter adopts a capacitor to accumulate energy for engine ignition instead of traditional contacttype approach, it enhances the igniting performance of a spark plug effectively. As a result, combustion efficiency is promoted, fuel consumption is saved, and exhaust emission is reduced. The igniter not only is good for fuel efficiency but also can reduce HC and CO emission significantly, which therefore is an environmentally friendly product. The control core of the igniter is implemented on a single chip, which lowers discrete component count, reduces system volume, and increases reliability. In addition, the ignition timing can be programmed so that a timing regulator can be removed from the proposed system, simplifying its structure. To verify the feasibility and functionality of the igniter, key waveforms are measured and real-car experiments are performed as well.

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Soft-switched DC/DC converter with PWM control

Cited by 19 publications

References 10 publications

Practical Application of the Wave-Trap Concept in Battery–Cell Equalizers

Practical Application of the Wave-Trap Concept in Battery–Cell Equalizers

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

Contactless Electric Igniter for Vehicle to Lower Exhaust Emission and Fuel Consumption

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