Interleaved zero current transition buck converter

AC-DC converters with input power factor correction (PFC) that consist of two or more interleaved boost converter modules are popular in industry. PFC is a must in today's AC-DC converters as their input current must meet harmonic standards set by regulatory agencies.With interleaving, the input current of each module can make to be discontinuous and the size of their input inductors since interleaving can reduce the high ripple in each module and produce a net input current with a ripple that is comparable to that achieved with a single boost converter module with a large input inductor.In high-frequency converters, so as to achieve low harmonic, fast dynamic response, low size, and high-power density the frequency should be increased. The drawback of increasing the switching frequency is increasing the switching losses. This is reason that why soft-switching methods should be used. The focus of the thesis is on zero current switching (ZCS) methods for insulated gate bipolar transistor (IGBT) converters. The auxiliary switch in the proposed converter is activated whenever a main converter switch is about to be turned off, gradually diverting current away from the switch so that it can turn off with ZCS and eliminate the switching losses. In addition, the auxiliary circuit is designed in a way that it can be activated only when the converter is operating with heavier loads and not used when the converter is operating with light load to maximize the overall efficiency.The operation of the novel converter will then be explained and the mathematical analysis in steady-state will be derived. Based on the results of the analysis, general design guidelines will be provided. Finally, the design procedure will be confirmed by experimental results obtained from the proof of concept prototype.

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“…ZCS methods in boost converters have at least one of the following drawbacks [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]:…”

Section: Literature Reviewmentioning

confidence: 99%

A novel AC-DC interleaved ZCS-PWM boost converter

Rasoulinezhad

Abosnina

Moschopoulos

2018

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

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“…A two switch topology that maintains all positive benefits of hard-switching topologies i.e. simplicity and no additional voltage and current stress of the switches is described in [15]. Again, both switches equally transmit power to the load.…”

Section: Introductionmentioning

confidence: 99%

“…The topologies described in [13][14][15][16], similar to the topologies with auxiliary switch, have limitations such as lack of soft-switching over the whole operation range and higher switch peak current or voltage stress, but have a distinct advantage of simpler control since no additional output for the auxiliary switch is needed. With little or no change, classical PWM control can be used.…”

Section: Introductionmentioning

confidence: 99%

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High Power Soft—switching IGBT DC—DC Converter

Čobanov¹,

Jakopović

Šunde

2013

Automatika

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A soft-switching topology for high power buck converter is proposed. Zero-current turn-on and zero-voltage turn-off is achieved without auxiliary switches. All active switches in the converter transmit power to the load equally. Converter control is simple despite four active switches. Converter operation is described and DC analysis is carried out. All operation modes are identified. The condition for soft-switching is derived. A full-scale 38 kW laboratory prototype with 1700 V IGBT modules is built for railway application. Switching frequency is fixed at 20 kHz. Experimental results are shown. The results confirm the analysis. A high efficiency of 97 % is achieved.Key words: buck converter, IGBT switch, soft-switching, static characteristic IGBT pretvarač za velike snage s mekim sklapanjem. Predstavljena je nova topologija silaznog istosmjernog pretvarača s mekim sklapanjem pogodna za velike snage. Isklapanje pri nuli napona i uklapanje pri nuli struje ostvareno je bez pomoćnih sklopki. Sve aktivne sklopke u pretvaraču prenose snagu u teret podjednako. Upravljanje pretvaračem je jednostavno unatoč većem broju aktivnih sklopki. Opisan je i analiziran rad pretvarača. Identificirani su svi načini rada. Izvedeni su uvjeti za meko sklapanje. Izraen je laboratorijski model pretvarača u punoj snazi od 38 kW. Model je izveden s 1700 V-tnim IGBT modulima, a za primjenu na tračničkim vozilima. Sklopna frekvencija je konstantna i iznosi 20 kHz. Prikazani su rezultati mjerenja. Potvrena je provedena analiza. Postignut je visoki stupanj korisnog djelovanja od 97 %.

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“…Therefore, it is not obvious that the total efficiency of the converters has improved. High-peak voltage or current of the main power switches and the diodes also happened [6]- [8]. Consequently, higher ranks of devices must be adopted for the converters, and additional power losses will also be generated.…”

Section: Introductionmentioning

confidence: 99%

A Simple Structure of Zero-Voltage Switching (ZVS) and Zero-Current Switching (ZCS) Buck Converter with Coupled Inductor

Wei¹,

Luo²,

Nan³

et al. 2015

Journal of Power Electronics

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In this paper, a revolutionary buck converter is proposed with soft-switching technology, which is realized by a coupled inductor. Both zero-voltage switching (ZVS) of main switch and zero-current switching (ZCS) of freewheeling diode are achieved at turn on and turn off without using any auxiliary circuits by the resonance between the parasitic capacitor and the coupled inductor. Furthermore, the peak voltages of the main switch and the peak current of the freewheeling diode are significantly reduced by the coupled inductor. As a result, the proposed converter has the advantages of simple circuit, convenient control, low consumption and so on. The detailed operation principles and steady-state analysis of the proposed ZVS-ZCS buck converter are presented, and detailed power loss analysis and some simulation results are also included. Finally, experimental results based on a 200-W prototype are provided to verify the theory and design of the proposed converter.

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Interleaved zero current transition buck converter

Cited by 19 publications

References 32 publications

A novel AC-DC interleaved ZCS-PWM boost converter

A novel AC-DC interleaved ZCS-PWM boost converter

High Power Soft—switching IGBT DC—DC Converter

A Simple Structure of Zero-Voltage Switching (ZVS) and Zero-Current Switching (ZCS) Buck Converter with Coupled Inductor

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