Lossless Snubber Cell for a Soft-Switched Bidirectional Buck–Boost Converter

Abstract

In this paper, we propose a lossless snubber cell for a soft-switched bidirectional buck-boost converter (BBC). The proposed snubber cell provides all switches with soft-switching conditions in both the bidirectional power flows of the BBC. In addition, the cell also achieves a relatively low circulating current for the snubber operation over a wide load range. In particular, the reverse recovery problem of the synchronous rectifier can be eliminated with the aid of the snubber inductor. Accordingly, the snubber cell enables high-frequency switching of approximately 60 kHz for all power switches and achieves high efficiency and high power density. Moreover, the proposed snubber cell does not have any auxiliary switch; therefore, complex auxiliary circuits or driving algorithms for the auxiliary switch are not required. Therefore, the proposed snubber cell has a simple structure with high reliability. To confirm the validity of the proposed lossless snubber cell, we provide detailed analyses, design guidelines, and experimental results using a 3-kW laboratory prototype.

A Comparative Study of Cutting-Edge Bi-Directional Power Converters and Intelligent Control Methodologies for Advanced Electric Mobility

“…This allows high-frequency switching (60 kHz) across all power switches, thereby enhancing the efficiency and power density. This design eliminates the need for auxiliary switches and is characterized by a straightforward structure, high reliability, and a lack of complex auxiliary circuits or driving algorithms [8]. The Buck-Boost converter, a versatile power electronic device, offers valuable insights and possesses notable merits and demerits for applications in electric vehicle (EV) systems.…”

PV System based Zeta Converter with Three-Phase Inverter For High-Speed BLDC Motor Applications

“…The switching performance of the switch can be improved by using a lossless snubber cell for Buck boost converter. This proposed method by Joo& Han have enabled BBC to operate at high switching frequencies with higher efficiencies [12]. These concurrent improvements in technologies have direct influence over the years which is not only being separated as such from production and distribution but also includes on its applications especially motors.…”

Reducing Surge Voltage and Ringing Effect of DC Voltage Converter by Transient Suppressor

“…A "power supply rail" or "voltage rail" generally refers to the various voltages provided by the power supply. (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) The power supply of the first generation of microcomputers and home personal computers was linear and composed of a heavy step-down transformer combined with a rectifier, a filter element, and a voltage regulator. Modern computers use a switching-mode power supply after the main power supply is directly rectified and filtered.…”

“…A switching-mode power supply is much lighter, cheaper, and more efficient than a linear power supply. (2,3,10,12,17) At present, pulse width modulation-type switching power converters and non-isolated DC-DC converters with switching inductance are predominantly used because of their low cost and mature technology. There are three basic electrical structures: buck type, boost type, and boost and buck type.…”