A control method to improve the efficiency of a soft-switching non-isolated bidirectional DC-DC converter for hybrid and plug-in electric vehicle applications

Abstract

Hybrid energy storage system (HESS) can be adopted in hybrid, plug-in hybrid, and pure electric vehicles (HEV, PHEV, and EV), where a bidirectional DC-DC converter (BDC) is used to connect batteries and ultracapacitors. The efficiency improvement of the BDC is beneficial to increase the efficiency viability of HESS. Due to ZVS, high efficiency can be obtained at heavy load operations while the efficiency is low at light load operations mainly because of the conduction losses of the auxiliary circuits. These losses

Soft-switched high step-up DC/DC boost converter for distributed generation

“…Conventional hard-switched pulse-width modulated (PWM) converters suffer from the drawbacks of high switching loss, high device stress and objectionable EMI, if operated with high switching frequency. Soft-switching PWM techniques have been successfully used by many researchers (Jiang et al, 2013(Jiang et al, , 2014Lin, 2017;Patil et al, 2011;Qian et al, 2016;Saha, 2011;Saha et al, 2011) to make modern switch mode power supply (SMPS) more compact with large power to volume ratio by high switching frequency operation and simultaneously maintaining high efficiency. The switching devices of soft-switching converters change their state, either when the voltage across them is zero (zero-voltage switching, ZVS) or when the current through them is zero (zero-current switching, ZCS).…”