Resonant DC – DC Buck-Boost Converter for the Battery Charger and PV Applications (original) (raw)
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Zero Voltage and Zero Current Switching Buck-Boost DC/DC Converter Using Partial Resonant Circuit
Digital Signal Processing, 2011
A family of soft-switching power converter is presented for fuel cell applications. The salient points are that all the switching devices are under zero-current switching during turn-on and zero-voltage switching during turn-off. The family of the circuit presented includes the buck, boost, buck-boost and Cuk converter. The active switches in the converter undergo zero-capacitive turn-on losses unlike switches in other soft-switched topologies discussed in the literature. The switches do not experience any over voltage/over current stress proportional to load as in resonant converters. This soft-switching technique can also be applied to other classical switched mode power converters. A detailed mathematical analysis of the converter under steady state is carried out, and experimental results obtained from a prototype are presented. The converter was also connected to a model toy car driven by fuel cells for the demonstration of the application.
An Improved Soft-Switching Buck Converter With Coupled Inductor
IEEE Transactions on Power Electronics, 2000
This letter presents a novel topology for a buck dcdc converter with soft-switching capability, which operates under a zero-current-switching condition at turn on and a zero-voltageswitching condition at turn off. In order to realize soft switching, based on a basic buck converter, the proposed converter added a small inductor, a diode, and an inductor coupled with the main inductor. Because of soft switching, the proposed converter can obtain a high efficiency under heavy load conditions. Moreover, a high efficiency is also achieved under light load conditions, which is significantly different from other soft-switching buck converters. The detailed theoretical analyses of steady-state operation modes are presented, and the detailed design methods and some simulation results are also given. Finally, a 600 W prototype is built to validate the theoretical principles. The switching waveforms and the efficiencies are also measured to validate the proposed topology.
Analysis of Non-isolated Soft Switching DC-DC Buck Converter
2008 IEEE Region 10 and the Third international Conference on Industrial and Information Systems, 2008
A novel zero-voltage switching (ZVS) step-down converter with a tapped inductor is proposed in this paper. Tapped inductor provides better power density as compared to isolation buck converter. With a simple structure, the tappedinductor buck converter shows promise for extending the duty cycle. This converter is cost effective and attractive for high performance. Furthermore, with the replacement of transformer by tapped inductor, its efficiency may be maximized for low power application and power quality is improved as low harmonics at input as well as output. The peak current of the main switch is reduced by tapped inductor operation, thus the conduction loss and switching loss levels of the main switch are lowered. Consequently, this tapped inductor scheme alleviates the severe power stress and enhances device utilization. This soft-switching buck converter is suitable for extremely low stepdown ratio applications. The principle of the proposed scheme, analysis of the operation, and design guidelines are included. Finally, the experimental result of the 10W prototype DC/DC converter is given for hardware verification.
Zero-voltage and zero-current switching buck-boost converter with low voltage and current stresses
A family of soft-switching power converter is presented for fuel cell applications. The salient points are that all the switching devices are under zero-current switching during turn-on and zero-voltage switching during turn-off. The family of the circuit presented includes the buck, boost, buck-boost and Cuk converter. The active switches in the converter undergo zero-capacitive turn-on losses unlike switches in other soft-switched topologies discussed in the literature. The switches do not experience any over voltage/over current stress proportional to load as in resonant converters. This soft-switching technique can also be applied to other classical switched mode power converters. A detailed mathematical analysis of the converter under steady state is carried out, and experimental results obtained from a prototype are presented. The converter was also connected to a model toy car driven by fuel cells for the demonstration of the application.
Performance study of a transformer less ZVS buck DC-DC converter for photovoltaic application
This paper aim to design a transformer less soft switched buck DC-DC converter for a photovoltaic application. Hard switched DC-DC converters generate electromagnetic interference, higher switching losses and stress on power devices. Soft switching leads to reduce these demerits. In this paper a quasi-resonant ZVS buck converter is designed and its switching behavior is studied. Simulation model is prepared and results have shown that soft switching scheme does not allow power switch to suddenly turn ON and OFF thereby reducing the switching losses.
2013
This paper presents a Buck type circuit structure, the designing of ZCS resonant Buck converter and analysis of the working principles involved. The designed buck converter uses ZCS technique and the function is realized so that the power form is converted from 12V DC to 5V DC (1A). A detailed analysis of zero current switching buck converters is performed and a mathematical analysis of the mode of operation is also presented. In order to reduce the switching losses in associated with conventional converters; resonant inductor and resonant capacitor (LC resonant circuit) is applied which helps to turn on-off the switch at zero current. The dc-dc buck converter receives the energy from the input source, when the switch is turned-on. If the switch is turned-off the LC resonant circuit pumps the energy by ensuring that the current does not come to zero. During the hardware implementation Ton, Toff, duty cycle & operating frequency values were determined and thoroughly tuned through the NE555 IC circuit. As a result of this various waveforms across capacitors, inductors and load resistor were observed. A simulation study was carried out and the effectiveness of the designed converter is verified by PSpice simulation results.
Zero-Voltage and Zero-Current Switching Buck-Boost Converter for PV Applications
A ZVS and ZCS buck boost converter is presented for PV panel applications. The salient points are that all the switching devices are under zero-current switching during turn-on and zero-voltage switching during turn-off. The active switches in the converter undergo zero-capacitive turn-on losses unlike switches in other soft-switched topologies. The switches do not experience any over voltage/over current stress proportional to load as in resonant converters. This soft-switching technique can also be applied to other classical switched mode power converters. A detailed analysis of the converter under steady state is discussed and simulation results obtained are presented. Keywords: Zero current switching, Zero voltage switching, PV panel, Buck-boost converter
Analysis, Design and Control of Zero Current Switching DC To DC Buck Converter
2012
A soft-switching buck converter is proposed for battery charging application. This converter can also be used with other low voltage miniature applications. Resonant inductor and capacitor helps to turn on-off the switch at zero current. This reduces switching losses in our conventional converter. In order to determine two (current) zero-cross points for switch-on and switch-off, the quasi-resonant state is employed. The quasi-resonant state is performed in fullwaveform mode. This makes output voltage independent of output load variation. This leads to efficiency higher than conventional converter due to ZCS. Complete design-oriented mathematical calculations were done for zero current resonant switching converters. The performance of the proposed converter is evaluated on a 3.24-W (6 V/0.54 A) experimental prototype.
Design & Implementation of Zero Voltage Switching Buck Converter
Zero voltage switching (ZVS) buck converter is more preferable over hard switched buck converter for low power, high frequency DC-DC conversion applications. In Zero voltage switching converter, turn on & turn off of a switch occurs at zero voltage that results in lower switching losses. In this converter soft switching is achieved by using resonant components. The optimal values of resonant components are determined by using electric functions derived from circuit configuration. This type of soft switched resonant converter offers very low electromagnetic interference (EMI).This study presents the circuit configuration with least components to realize highly efficient zero voltage switching resonant converter. It’s feasibility is confirmed with the developed proto type model and experimental results are verified.
Soft-Switching dc-dc Converters
Springer eBooks, 2017
A class of dc-dc converters, known in the literature as soft-switching resonant converters, has been thoroughly investigated in recent years for its various attractive features. Soft switching means that one or more power switches in a dc-dc converter have either the turn-on or turn-off switching losses eliminated. This is in contrast to hard switching, where both turn-on and turnoff of the power switches are done at high current and high voltage levels. One approach is to create a fullresonance phenomenon within the converter through series or parallel combinations of resonant components. Such converters are generally known as resonant converters. Another approach is to use a conventional PWM buck converter, boost, buck-boost, Cuk, and SEPIC and replace the switch with a resonant switch that accomplishes the loss elimination. Because of the nature of the PWM circuit, resonance occurs for a shorter time interval compared to the full-resonance case. This class of converters, combining resonance and PWM, is appropriately known as quasi-resonance converters. In this chapter, our focus will be on the latter method, mainly using the resonance PWM switch to achieve soft switching. For simplicity, here we use the term soft switching to refer to dc-dc converters, quasi-resonance converters, and other topologies that employ resonance to reduce switching losses. Two major techniques are employed to achieve soft switching: zero-current switching (ZCS) and zero-voltage switching (ZVS). This chapter will focus only on ZCS and ZVS types of PWM dc-dc resonant switches and their steady-state analyses. 6.1 Types of dc-dc Converters As shown in previous chapters, linear-mode and switch-mode converters have been used widely in the design of commercial dc-dc power supplies. Linear power supplies offer the designer four major advantages: simplicity in design, no electrical noise in the output, fast dynamic response time, and low cost. Their applications,