Grid Tech

 A voltage converter is an electric power converter that changes the voltage of an electrical power source. On this page, I am going to talk about the DC-DC converter. In the DC-DC converter, there are 3 types. 1. Step-down(Buck) converter: Where the output voltage of the converter is lower than the input voltage. In a buck converter, there are two types of modes. Continuous conduction mode(CCM) and Discontinuous conduction mode(DCM). During CCM(Mode 1), while switch S is on, the voltage of the load is conducted as V_s. During DCM(Mode 2), while switch S is off, any current doesn't flow.  V_a=F(t_on, f_s) is a linear function. t_on is the on pulse width. Controlling t_on is known as PWM control. f_s is the switching frequency.  Low current ripple(by adding inductor) This is a buck converter which provides a low current ripple by adding an inductor on load.  Low voltage ripple(by adding capacitor) This is a buck converter which provides low voltage rippl

EV means "Electric Vehicles", which use one or more electric motors or traction motors for propulsion. In this poster, there will be a description about the history of electric vehicles and their current infrastructure. History of Electric Vehicle   Electric car built by  Thomas Parker , photo from 1895    In 1827, Hungarian priest, Ányos Jedlik, started electric power. After that year, he used an electric motive motor to power his small car. It had been developed and upgraded more and more.  Finally, in America, in the early 1900s, the first mass-produced electric vehicles appeared. But It had more disadvantages than advantages compared to a combustion engine vehicle which appeared later. The high cost, low speed, and short-range battery problem were the main problems of EV in comparison to a combustion engine vehicle.  But, in the 21st century, demand for alternative fuel instead of oil has been increasing. By the help of the trend, the importance of electric ve