The hardware implementation of the same circuit is also shown. A soft switching zcszvs double twoswitch forward converter. The second part consists of an auxiliary circuit to provide zcs on the switch sm. The converter uses the zcs technique with the concept of resonant switch, which is a combination of semiconductor device and lc network, and makes the switch to turn on and turn off at zero. However, one can achieve better operating efficiency of the overall system by using a lowcost microcontroller to adjust the frequency, duty cycle and deadband. This study includes circuit simulations using pspice software and practically. U122 a new family of integrated circuits controls resonant mode. The llc resonant circuit reduces switching loss through zerovoltage switching zvs. Zvs depends on tank current zero crossings with respect to transistor switching times tank voltage zero crossings operation below resonance. Simulation of zcs pwm buck converter by using matlab softwares testing and.
Zero voltage switching resonant power conversion bill andreycak ing zero current, hence zero power switching. For example, a computer while ensuring the voltage and. Zvs zero voltage switching to reduce switching loss, improve efficiency, reduction in heating loss, resonant tank, download psim software. Ecen 5817 resonant and softswitching techniques in power electronics spring 2014 schedule. Apr, 20 the resonant converter broadly classified into eight types. Dec 03, 2018 zvs zero voltage switching to reduce switching loss, improve efficiency, reduction in heating loss, resonant tank, download psim software.
This traverses the voltage across the switch from zero to its peak, and back down again to zero. Pdf design and analysis of zero current switching based dc to. Resonant circuits and soft switching toshiba electronic devices. Digital simulation of fm zcs quasi resonant converter fed dd servo drive. In theory, the resonant converter should yield a more compact design with the capability of power switching losses. The llc converter is a resonant inverter with 3 reactive elements where dc input voltage is turned into a square wave by a switch network arranged as either a half or fullbridge. Crm operation reduces switching losses of main switches at turnon of them and zerocurrent switching zcs of the output diodes reduces also switching losses and alleviates reverse recovery problem of output diodes. Analysis, design and implementation of zerocurrentswitching. In a resonant switch converter, reactive elements capacitors and inductors are added around the switch to generate the sinusoidal voltage or current. Zero current switching an overview sciencedirect topics. Optimal digital power control using llc resonant converters.
Some zvs and zcs techniques requires variablefrequency control to regulate the output, which is a disadvantage. Jun, 2017 this paper proposes a structure based on the association of two two switch forward converters connected to a single highfrequency transformer, whose operation is analogous to the conventional fullbridge topology. Analysis of zvszcs softswitching dualresonant converter. Smps takes power from the main power lines and transfers it to a load. The switch turnon and turnoff occurs at zero current, which significantly reduces the switching losses.
The circuit configuration of proposed converter is shown in figure 2. In this project a detailed study of zero current switching buck converters is. At this point the switch can be reactivated, and lossless zero voltage switching facilitated. Crm operation reduces switching losses of main switches at their turnon and zerocurrent switching zcs of the output diodes reduces the switching losses and alleviates reverse recovery problem of output diodes. Microchips 200w dcdc llc resonant converter reference design. Llc resonant converters increase efficiency in dctodc. The converter consists of a fullbridge mosfet bridge, a resonant tank represented by the lr inductor and cr capacitor block, a fullbridge rectifier and an output filter co. Ltype zcs resonant converter modes operation and waveforms the capacitor current is an ltype zcs resonant converter is shown above. Analysis and design of high effeiceny zcs buck pwm. During the zvs switch offtime, the lc tank circuit resonates. Abstract a softswitching converter with dual resonant structures is presented in this paper. Resonant and softswitching techniques in power electronics. This consists of auxiliary diodes d 2, d 3, the resonant inductor lr, the resonant capacitor cr and the auxiliary switch sa.
It consists of one main inductor l and two switches with their auxiliary components. The converter is simulated in orcad capture cis software with design. Apr 24, 2012 resonant converter drivers are designed to adjust the switching frequency of the halfbridge to regulate the output. The dual resonant tanks are composed by the leakage inductors and resonant capacitors to achieve zerocurrentswitching zcs turnoff mechanism for diodes at the secondary side of transformer. Since 1986, interest in resonant mode power conversion has exploded in.
Quasi resonant converter technique called zero current switching was proposed by lee et al in the year 1987 1, 4, according to which switch can be turned off at zero current by simply connecting an inductor of appropriate value in series with the switch. Resonant and softswitching converters sciencedirect. It feeds the resonant llc tank that filters out harmonics providing a sinusoidal like voltage and current waveform. Principle of operation the operation for the converter system is explained as follows. The buck resonant converter replacing the switch by the resonanttype switch, to obtain a quasiresonant pwm buck converter it can be shown that there are four modes of operation under the steadystate condition fig 6. Quasi resonant converter qrc, zero current switching zcs. Twoquadrant zcs quasiresonant luoconverter in reverse operation is shown in fig. Use your right click menu to convert audio files directly from windows explorer.
And while true, two obvious concerns can in1pede the quest for high efficiency operation with high voltage inputs. A zcs qrc designed for halfwave operation is illustrated with a buck type dcdc converter. To propose soft switching buck converter with zcs for its switch using as simple circuit as possible. The converter circuits which employ zero voltage and or zero current switching are known as resonant converters. May 17, 2017 a currentfed zerovoltageswitching zvs and zerocurrentswitching zcs clresonant pushpull dc dc converter is presented in this paper. Moreover, the voltage stresses of power switches are clamped. Operation and design 4 application note an 201209 v1. Design and analysis of zero current switching based dc to. It is a new softswitching technique with twoquadrant operation, which effectively reduces the power losses and largely increases the power transfer efficiency. The converter consists of a switching bridge halfbridge mosfet, an llc resonant circuit, a fullbridge rectifier and an output filter co. A switch is said to have zerovoltage switching zvs zerocurrent switching zcs when the voltagecurrent is zero as the switch changes state. Digital simulation of fmzcsquasi resonant converter fed dc. A zerocurrentswitching zcs converter with a quasiresonant converter qrc. Pdf design and analysis of zero current switching based dc.
A resonant converter will be measured and will be compared to the hardswitched converter to see if the common belief that softswitched converter have reduce power switching losses. Analysis and design of high effeiceny zcs buck pwm converter in. Each forward converter employs a soft switching cell that allows the. Sudden current changes in the switch are avoided in zcs. Analysis and design of a current fed zero voltage switching. The fmzcsqrc was simulated using matlab simulink software. In most of these converters some form of lc resonance is used, that is why these are known as resonant converters. The converter uses the zcs technique with the concept of resonant switch, which is a combination of semiconductor device and lc network, and makes the.
An smps switched mode power supply refers to an electronic device that uses a switching regulator for the purpose of converting electrical power in an efficient manner. Pdf performance study of series resonant converter using. Resonant converters university of nevada, las vegas. A resonant switch represents a sub circuit consisting of semiconductor switch s1 and resonant elements l r1, and c r1.
Zero voltage switching zvs for dc converter matlab. Jun 27, 2019 microchips 200w dcdc llc resonant converter reference design operates over a wide input voltage range 350 420vdc with a nominal input of 400v, providing a 12v dc output, while maintaining highvoltage isolation between the primary and secondary. By nature of the resonant tank and zero current switching limitation, the peak switch. Use as a command line plugin for automation with software to convert or compress audio files. The voltage and current waveforms are traced and thereafter the experimental results are compared with. In this case, both transformer and output filter inductor are designed for twice the switching frequency. Zero current switching quasi resonant converter circuit is designed and then simulated on matlab. In zcs, the power switch turnsoff at zero current but at turnon, the converter still suffers from turnon loss caused by the output capacitor of the power switch. Zcs flyback converter next 2275 research blvd, suite 500. A detailed analysis of zero current switching buck converters is performed and a. Unlike the slr converter, the llc converter can keep the output voltage regulated even under light load condition. The resonant phenomena of zcs converter with qrc is used to determine the. Nov 30, 2012 resonant and soft switching converter zvs convertersin these converters, the resonant capacitor provides a zero voltagecondition for the switch to turn on and turn off.
Figure 2 halfwave, quasiresonant buck converter with zcs. To compute the optimal values of resonant converter by applying the characteristic curve and mathematical calculation from the circuit configuration. It is formed by replacing the power switch in conventional pwm buck converter with the zc resonant switch in fig. The three main classes of resonant converters are series resonant converter src, parallel resonant converter prc and a combination of the two, the seriesparallel resonant converter sprc. Interleaved zcs boost dcdc converters using quasiresonant. Design and hardware implementation of ltype resonant step. Digital simulation of fmzcsquasi resonant converter. When the switch s isturned on, it carries the output current io. To simulate the zcs resonant buck converter using orcad capture.
Wav encoder and flac converter supports a range of sample rates. Convert audio files tofrom all audio formats with switch. The proposed converter considered as a zerocurrentswitched quasi resonant converter zcs qrc. The ddit value is small, the stresses are reduced and hence emi is reduced.
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