25-08-2017, 09:32 PM
A CONTINUOUS-CONDUCTION-MODE (CCM) BOOST CONVERTER FOR HIGH-POWER APPLICATIONS
A CONTINUOUS-CONDUCTION.pdf (Size: 153.56 KB / Downloads: 22)
Continuous-Conduction-Mode.pdf (Size: 147.23 KB / Downloads: 22)
Boost Converter.pdf (Size: 80.67 KB / Downloads: 23)
CCM Boost Converter.pdf (Size: 197.18 KB / Downloads: 19)
DIGITAL SIMULATION.pdf (Size: 343.84 KB / Downloads: 29)
CONVERTER.pdf (Size: 876.76 KB / Downloads: 25)
HIGH POWER APPLICATIONS.ppt (Size: 2.4 MB / Downloads: 39)
INTRODUCTION
Continuous-Condction-Mode (CCM) boost converters are widely used as the front-end converter for active input current shaping [14] and in recent years, they are increasingly needed in high-power applications such as hybrid electric vehicles and fuel cell power conversion systems. Hard-switched CCM boost converter suffers from severe diode reverse-recovery problem in high-current high-power applications. The effect of the reverse-recovery-related problems becomes more significant for high switching frequency at high power rating and hence the hard-switched CCM boost converter is not capable to achieve high efficiency and high power density at high power rating [6], [29]. In order to overcome this problem, a Continuous-Conduction-Mode (CCM) Boost Converter appropriate for high-power applications is implemented. It offers distinct advantages such as Zero-Voltage-Switching (ZVS) turn-on of the main switches in Continuous-Conduction-Mode (CCM), negligible reverse recovery loss due to Zero-Current-Switching (ZCS) turn-off of diode, significantly reduced components’ voltage ratings and energy volumes of passive components and high voltage gain.
Hard and soft switching techniques with its typical switching trajectories of power switch are described in Chapter 2.
A brief description about the block diagram of CCM Boost Converter is discussed in Chapter 3.
Circuit diagram and its modes of operation with its equivalent circuit and key waveforms are discussed in Chapter 4. Voltage conversion ratio and ZVS characteristics of main switch S1 is also dealt in the same Chapter.
Design of 80/400V, 200W Continuous-Conduction-Mode (CCM) Boost Converter for High-Power Applications is clearly explained in Chapter 5. Comparison of component ratings of the proposed converter with conventional ZVT (Zero Voltage Transition) converter is also described in Chapter 5.
Computer simulation of power-electronic circuits provides a sound solution for circuit design and analysis as the computers are well capable of performing the tedious, lengthy and repetitive computations; the converter is simulated using MATLAB 7.8 software at a switching frequency of 70 kHz and the simulated outputs are depicted in Chapter 6.
Experimental results of a 200W, 80/400V prototype converter are depicted in Chapter 7 in order to validate the concept and the results agree with the simulation to an appreciable degree.