Soft-Switching Boost Converter with an Auxiliary Resonant Circuit

AC supply is most commonly available at different line frequencies. The majority of the applications involving electronic circuitry such as those used in automotive applications and battery chargers need regulated DC supply. A suitable ACDC converter is required for such applications. The switching power supply market is flourishing quickly in today's high-tech world. Design engineers are not all times supplied with the preferred amount of voltage they need, in order to make their design work. Adding an additional voltage supply or a design is not always cost efficient. Boost converter is used for stepping up the DC voltage but there occurs switching losses. This paper presents soft-switching DC-DC converter using an auxiliary resonant circuit. The circuit consists of a general Boost converter with an additional auxiliary circuit. By using an auxiliary resonant circuit, switching losses of a boost converter is reduced. Generally boost converter circuits have snubber circuit where switching losses are dissipated in external passive resistors; this is known as hard switching. In the proposed topology the generation of switching losses is avoided by forcing voltage (ZVS) or current (ZCS) to zero for the duration of switching. The efficiency is enhanced due to decrease in switching losses. Simulations are performed in NI Multisim 12.0 software to verify the theoretical analysis.