Abstract This application note is a guide for the selection of high voltage power BJTs (Bipolar Junction Transistors), and provides a detailed description of the operation of a horizontal deflection circuit by examining its resonant mode operation. Some recommendations for reducing the case temperature of the BJT are suggested by studying its ZVS (zero voltage switching) operation, and its inhe...

The parallel interleaved three-phase inverters are suitable for high-power applications due to the current ripple canceling effect. power density and efficiency can be further improved with prediction (CRP) based high frequency zero-voltage switching (ZVS). However, variable increases rapidly as decrease, resulting in higher turn-off loss at light load despite elimination of turn-on loss. In th...

Dual active bridge (DAB) converters are extensively used due to the advantages of wide voltage regulation range and easy realization soft switching. Besides, concept partial power (PPCs) has been widely applied increase converter efficiency by reducing actually processed converter. Therefore, in this paper, DAB PPC combined. And a high frequency DAB-based aiming at optimization is selected out ...

In this project the bridge less Z-source converter is introduced to power factor correction (PFC) applications. The concept is demonstrated through a wireless charging, namely Z-source resonant converter (ZSRC). The ZVS and ZCS operation will reduce the switching losses. Due to the Z-source network (ZSN), the ZSRC inherently performs PFC and regulate the system output voltage simultaneously, wi...

Abstract – A novel parallel three-level zero voltage switching (ZVS) DC converter is presented for medium voltage applications. The proposed converter includes three sub-circuits connected in parallel with the same power switches to share load current and reduce the current stress of passive components at the output side. Thus, the size of the output chokes is reduced and the switch counts in t...

* Prepared by Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Dept. of Energy under contract DE-AC05-00OR22725. The submitted manuscript has been authored by a contractor of the U.S. Government under contract DE-AC05-00OR22725. Accordingly, the U.S. Government retains a nonexclusive, royalty-free license to publish or reproduce the published form of this contribution, o...

High efficiency DC-DC converters with high-voltage gain have been researched due to increasing demands. A soft-switching single-ended primary inductor converter (SEPIC) is presented in this work. An auxiliary switch and a clamp capacitor are presented in this project. A coupled inductor and an auxiliary inductor are utilized to obtain ripple-free input current and achieve zero voltage-switching...