In this paper is introduced a new family of DC-DC PWM converters using a true Zero Current and Zero Voltage Transition (ZCZVT) commutation cell. The soft-switching technique utilized provides Zero Current Switching (ZCS) and Zero Voltage Switching (ZVS) simultaneously, at both turn-on and turn-off of the main switch and ZVS for the main diode. The family of ZCZVT PWM converters is obtained from...

This paper proposes a novel soft-switching singlephase ac–dc–ac converter to give high input power factor and low current distortion on the rectifier side and provide clean and stable ac voltage on the inverter side. The proposed converter uses a new zero voltage switching (ZVS) strategy to get ZVS function. Besides operating at constant frequency, all semiconductor devices operate at soft-swit...

The experimental and theoretical results of a ZVS (Zero Voltage Switching) isolated flyback DC-DC converter using multilayered coreless PCB step down 2:1 transformer are presented. The performance characteristics of the transformer are shown which are useful for the parameters extraction. The measured energy efficiency of the transformer is found to be more than 94% with the sinusoidal input vo...

This paper presents the supercapacitor power management method for the Hybrid Electricals Vehicles.A simple zero-voltage switching(ZVS) interleaved boost power factor correction(PFC) AC/DC converter is used to charge the traction battery of an Hybrid Electrical Vehicle. The auxiliary circuit provides limited current to charge and discharge the MOSFETs output capacitors during turn-On times at z...

Various circuit technologies have been studied and developed. One of main streams concerns a soft switching technology to mitigate switching stress, leading to the reduction in switching losses or electro-magnetic noise. On the other hand, as a characterized orthodox technology, the existing chopper circuit is used for the electric vehicles, etc. Such technologies have a tendency to go out of v...

In inverter design for electric vehicle applications there are several major requirements that should be met. The inverter should be able to operate bidirectionally with reasonably high efficiency under a high ambient temperature. Therefore it is critical to select the suitable main switches for the inverter. In this paper seven types of devices (including 3 dual IGBTs, 1 intelligent dual IGBT,...

In this thesis, an isolated 2.5kW fullbridge DC/DC converter has been designed and analyzed regarding its efficiency and weight. By increasing the switching frequency, the magnetic components in the converter can be made smaller, in this thesis a switching frequency of 20 kHz has been compared with a switching frequency of 100 kHz. The transformer in the converter can be winded in different way...

Isolated bi-direction DC-DC converters are widely used for energy storage systems (ESS) of DC microgrids. Particularly, a current-fed isolated bi-directional converter (CF-IBDC) receives much attention due to its merits such as the naturally attenuated current ripple on battery side. However, high efficiency cannot be obtained at light and heavy load conditions under conventional control method...

This paper proposes an interleaved zero-voltage switching (ZVS) ultra-large gain converter. By implementing coupled-inductor (CI) and built-in transformer (BIT) together with a switched capacitor (SC) voltage multiplier cell (VMC), higher degree of flexibility is achieved for improvement step-up in comparison those which only one these magnetic devices utilised. Furthermore, the imposed across ...