A Novel Battery Charger System & Appended ZCS (PWM) Resonant Converter Dc-Dc Buck
1 选题背景与研究意义（Background and the importance of research）
The main study innovation-objective of this thesis is to develop a novel high-efficiency battery charger with ZCS PWM buck topology which has simple circuit structure, low switching losses, easy control and high charging efficiencies. Beside, this project is about to investigate the action of efficient performance in charging shaping to gain the high output charging efficiency of the battery charger.
The scopes of this project are:
-Study of Battery Charger
-Study the operation of buck converter.
-Study the operation of PWM step down techniques.
-Design the buck converter power stage circuit.
-Design the PWM controller stage circuit.
-Simulation of ZCS PWM buck converter by using MATLAB software’s
-Testing and calibration of the completed ZCS PWM buck converter with battery to confirm the actual response with the theoretical predictions.
-Observation of various voltage, current waveforms through inductor, capacitor of the converter
-published a Research article in International journal according to the project work
Today’s technologies have shown a drastic extreme changing in all section due to its developments and achievements. Many systems had been created for this purpose. In the battery industries, there are lot of battery charger that been developed to drive a good charging process. However there are still many chargers that are not suitable to use that may damage the battery itself or the user. A bad charging process may shorten the lifetime of the battery and more dangerous is the battery may explode. In order to achieving high efficiency in battery charger, append the traditional battery charger with the technique of ZCS ( Zero-Current- Switching) resonant buck topology which delivered the efficient performance in charging shaping. Accordingly, a ZCS converter with a wide input voltage or load range has a wide frequency range. This work presents a ZCS PWM converter for battery charger to solve the foregoing problems.
Block diagram of proposed project
Key Issue of Proposed Project:
In recent years, with the enhancement of power electronics technology and control strategies in power electronics devices coupled with the increasing demand of high efficiency in battery charger system has invoked enormous attention from the research scholars around the world. Battery charger system technology is currently being incorporated in urban industrial areas to maintain with these demands lot of work is on towards. Therefore, many battery chargers with different ratings and functionalities are being developed for high output efficiency since few years. The battery charger usually works to globalize the energy saving and to serve in fast transportation systems. The use of battery charger brings convince life solution during the traveling from urban to rural areas. Many techniques were fetched out by the scientists since battery charger device was developed for renewable energy generation, electronic communication power supplies, electric vehicles, UPS or an uninterruptible power supplies, PV systems and portable electronics products. Many charging methods have been developed to improve the battery charger efficiency in the last few decades. In order to achieving high efficiency in battery charger, append the traditional battery charger with the technique of ZCS ( Zero-Current- Switching) resonant dc-dc buck topology which delivered the efficient performance in charging shaping. This work looks at the issues which associates ZCS PWM (Zero-Current-Switching Pulse width Modulation) converter, buck topology with the battery charger. This paper develops a novel high-efficiency battery charger with ZCS PWM buck topology which has simple circuit structure, low switching losses, easy control and high charging efficiencies. Zero Current Switching resonant buck converter is analyzed and mode of operation is also studied. Various waveforms & charging curve period were noted down during the piratical examine using MATLAB software. The curve of charging efficiency during the charging period shows 89% charging output efficiency of novel proposed prototype. The proposed novel charger not only provides the advantages of both hard switching and resonant converters but also further yields a constant-frequency control, reducing the resonant time. The switch components in the novel charger are all operated at zero current, yielding high charging efficiency and large switching loss reduction.