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Non-Isolated Boost Converter with
Zero-Voltage-Switching (ZVS) Capability
R. Sumathira
1, K. Pandia Rajan
2, K.Karthikeyan
31,2,3EEE, PRIST University, Pondicherry, Tamil Nadu, India
Abstract-Our proposed topology in this paper is a no isolated boost converter with zero-voltage-switching (ZVS) capabilities is proposed. The auxiliary circuit only consists of a coupled inductor and a diode, which operates with a zero-current-switching (ZCS) condition. The ZVS, the reverse recovery problem of MOSFET antiparallel body diodes can be resolved, and the voltage and current stresses on the switch components are also reduced. The detailed operating analysis of the proposed converter and the design method of the main circuit are presented. Our aim is to verify the effectiveness and feasibility of the proposed boost converter, a experimental prototype is built up, and the related experimental waveforms and the efficiency curve are presented. Keywords: Zero-Voltage-Switching (ZVS), MOSFET, IGBT, KVL, KCL.
I. INTRODUCTION
The conventional non-isolated boost converter topology has been extensively used in various ac/dc and dc/dc applications. In fact,
the front end of today’s ac/dc power supplies with power-factor correction (PFC) is almost exclusively implemented with the boost topology. The boost topology is also used in numerous battery-powered applications to generate a high output voltage from a relatively low battery voltage. However in some applications, it may be advantageous to use a boost converter with a galvanic ally isolated input and output. For example, fault tolerant power systems that use a dual ac-input architecture can be implemented with isolated boost converters, [1], [2]. In fact, the isolated-boost-converter implementation offers a reduced number of components compared to the implementations with non-isolated boost converters in applications which require dual ac input [2]. Also, in applications where a power supply with both ac and dc inputs is required, the isolated boost converter can be applied to provide safety-required isolation between the inputs. So far, a number of boost topologies utilizing an isolation transformer have been proposed, [3]-[8]. Generally, these circuits exhibit increased voltage stresses on the switches and/or diodes due to the parasitic ringing of the leakage inductance of the transformer with the output capacitances of the switching devices. To control the parasitic ringing voltage, these converters rely on various snubber, which have detrimental effect on their efficiency and also limit their switching frequency. In this paper, a two-switch implementation and a three switch implementation of an isolated boost converter that exhibits voltage waveforms without parasitic voltage ringing across all semiconductor devices on the primary and secondary sides of the transformer are introduced. Ringing freeoperation in the presence of the transformer’s leakage inductance is achieved by
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The reference directions of currents and voltages plotted in Fig. 4 are shown in Fig. 2. As can be seen from the timing diagram of the control signals for switches S1 and S2 shown in Fig. 4, switches S1 and S2 of the proposed circuit are simultaneously turned on and off.
II. PROPOSED FUNCTIONALITY
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The similar topology is presented in [19], where the inductors of two phases are coupled to reduce the size of the inductors. However, for interleaved structures, a lot of components are needed, and the control methods are complicated. In addition, using the coupled inductors is a method to achieve soft-switching technologies [22]–[25]. In [24] and [24], the auxiliary coupled inductor can supply additional power flowing channel, so the currents of MOSFETs are bidirectional, which is critical for ZVS turn-on. In order to overcome the problems of superabundant auxiliary components, complex control methods, as well as possible high voltage and current stresses, a simple new ZVS boost converter topology based on the coupled inductor is proposed, which just needs an auxiliary winding and a diode compared with the conventional synchronous boost converter. Two inductors are coupled with the same magnetic core to reduce the iron core loss, size, and cost of the converter. In addition, the auxiliary winding in the coupled inductor can help implement ZVS conditions as mentioned above. The control method is the same as that of conventional Pulse Width-Modulated (PWM) controllers. The main MOSFETs can operate under ZVS conditions in all load conditions, and the auxiliary diode operates with a ZCS condition. The experimental prototype is built up to verify all the theoretical analysis of the proposed soft switching boost converter.
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V. CONCLUSION
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