Zero-Voltage-Switching Multiresonant Three-Level Converters

Jin, Ke; Ruan, Xinbo

doi:10.1109/tie.2007.894730

Cited by 63 publications

(26 citation statements)

References 10 publications

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“…If the switches does not goes to the off state then the voltage remains in zero [6][7][8][9]. The ZCS condition can be obtained when the PWM pulse is given to the switches the switch is turned on and the current across the switch is full.…”

Section: Resultsmentioning

confidence: 99%

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Soft Switching with Cascaded Transformers to Drive the PMDC Motor

jitha¹,

esh²,

anandam³

2015

IJAREEIE

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This paper presents a soft switching technique used along with the series connected transformer to run a PMDC motor. The three level PWM circuits with two active switches and the capacitors are connected in parallel with it. The two switches are reduced in the existing method. Instead of those two switches two capacitors are used to reduce the switching losses. The series resonant converter is used to achieve ZVS turn-on for all power switches and zerocurrent switching for all rectifier diodes. The switching losses of the switches and the reverse recovery loss of the diodes are reduced. The resonant converter has wide range of switching frequency that can be overcome by adopting the PWM method to regulate the output voltage. The series connected transformer is used in the primary and secondary side to balance and share the current which is supplied to the load. The PMDC motor can be used as load. The conventional method does not use any controller to control the resistive load. The speed of the motor can be sensed by using the fuzzy logic controller.The leakage inductance can be reduced by making the frequency constant. KEYWORDS: ZVS, ZCS, Fuzzy logic controller, PMDC motor, Converter, Cascaded Transformer I.INTRODUCTIONIn the conventional system three level or multilevel converters has been used obtaining high voltage. By using the neutral point diode and clamp, flying clamp the voltage stress can be reduced in the converters. Three level ZVS or ZCS converters [1] have been proposed to reduce the switching losses at the desired load range. To extend the range of the ZVS or ZCS the additional circuitry or leakage inductance has been used. The series resonant converters with variable switching frequency have been presented to have the advantages of high voltage gain and high circuit efficiency with a wide load range [2]. The series resonant converters have been widely adopted in the commercial computer and communication products [3].A resonant mode system gives the several benefits avoids many of the disadvantages occurred due to higher frequencies. While using a resonant circuit in the power path, the switches can be easily operate at either zero current or voltage in the waveform, So that the stress level of the switches can be reduced; the resonant sine waves reduces the higher frequency harmonics that minimises the noises and so the circuit now requires inductance and capacitance, parasitic elements may enhance the circuit performance. With these benefits, power systems operating in the range of 500 kHz to 2.0 MHz are now practical [4][5][6]. Even though the resonant converters has wide range of frequency from light load to full load the magnetic components in the series resonant converters are not easy to design at the optimal condition. so it is better that the dc-dc converter has the advantages of ZVS and ZCS functions in the series resonant converter and the constant switching frequency with duty cycle control. A new two level ZVS converter is presented for high input and current applications. ...

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Section: Resultsmentioning

confidence: 99%

“…A new two level ZVS converter is presented for high input and current applications. The switches in the existing system are less than the conventional system [7][8][9][10][11]. The selected switching frequency is less than the series resonant frequency.…”

Section: Iintroductionmentioning

confidence: 99%

Soft Switching with Cascaded Transformers to Drive the PMDC Motor

jitha¹,

esh²,

anandam³

2015

IJAREEIE

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“…Most of isolated topologies need a transformer and a high number of switching devices which increases the cost and the switching losses, in addition to more complicated control schemes [18][19][20][21]. Non-isolated topologies are mainly based on the conventional Buck-Boost and Cuk configurations which are fairly simple and easy to control [22][23][24][25]. However, in many applications the high gain requirements are such that the conventional DC-DC converter operates with extremely duty-cycle operation which may result in reverse-recovery problem and causes not only low efficiency but also creates electromagnetic interference (EMI) problems [13].…”

Section: Introductionmentioning

confidence: 99%

Bidirectional boost/buck quadratic converter for distributed generation systems with electrochemical storage systems

Pires

Foito

Cordeiro

2016

2016 IEEE International Conference on Renewable Energy Research and Applications (ICRERA)

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Abstract-The increasing number of distributed generation systems using renewable and non-conventional energy sources show the trend of future generation systems. Most of these systems require power electronic converters as an interface between the DC voltage buses and electrochemical storage systems. Such storage systems, like batteries or supercapacitors, usually need bidirectional DC-DC converters to allow their charge or discharge according with necessary operation conditions. In this paper, a non-isolated bidirectional Buck-Boost converter with high voltage gain for electrochemical storage devices used in distributed generation systems is presented. To achieve high voltage gain ratios, the proposed topology presents quadratic characteristics in both step-down (Buck) and step-up (Boost) operation modes. In addition to the wide conversion range, it presents continuous input and output current, reduced charging/discharging ripple and simple control circuitry. All these features allow the energy exchange smoothly and continuously resulting in a longer durability of storage devices. The principle of the operation of the proposed converter in both operation modes, as well as their theoretical analysis will be discussed. The performance of this bidirectional power converter is confirmed through simulation and experimental results.

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“…In order to realize the low size, light weight and high circuit efficiency SMPS, three-level converters with zero voltage switching (ZVS) or zero current switching (ZCS) at the desired load range have been proposed in [4][5][6][7][8][9][10]. Three-level converters with auxiliary circuits [11][12] have been proposed to extend ZVS operation range. However, the design procedure of the auxiliary circuit is very complicated to derive the component parameters of auxiliary circuit.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a New Parallel Three-Level Zero-Voltage Switching DC Converter

Lin¹,

Chen²

2015

Journal of Electrical Engineering and Technology

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-A novel parallel three-level zero voltage switching (ZVS) DC converter is presented for medium voltage applications. The proposed converter includes three sub-circuits connected in parallel with the same power switches to share load current and reduce the current stress of passive components at the output side. Thus, the size of the output chokes is reduced and the switch counts in the proposed converter are less that in the conventional parallel three-level DC/DC converter. Each sub-circuit combines one half-bridge converter and one three-level converter. The transformer secondary windings of these two converters are connected in series in order to reduce the size of output inductor. Due to the three-level circuit topology, the voltage stress of power switches is equal to V in /2. Based on the resonant behavior by the output capacitance of power switches and the leakage inductance (or external inductance) at the transition interval, each switch can be turned on under ZVS. Finally, experiments based on a 2 kW prototype are provided to verify the performance of the proposed converter.

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Zero-Voltage-Switching Multiresonant Three-Level Converters

Cited by 63 publications

References 10 publications

Soft Switching with Cascaded Transformers to Drive the PMDC Motor

Soft Switching with Cascaded Transformers to Drive the PMDC Motor

Bidirectional boost/buck quadratic converter for distributed generation systems with electrochemical storage systems

Analysis of a New Parallel Three-Level Zero-Voltage Switching DC Converter

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