Electronic switch-mode DC to DC converters or also known as DC Chopper is mainly used to provide the varies DC output voltage magnitude according to demand of the load. Power input from DC-DC process is derived from the DC power source which typically has a fixed input voltage. Basically, to produce a DC output voltage which achieved, able to do by setting the length of linkage time between the output and input on the same circuit. Components used to perform a liaison function none other is the switches (solid state electronic switches) such as thyristor, MOSFET, IGBT, GTO. Generally there are two functions of DC Chopper operation that is reducee voltage (Boost Converter) from 39 Volt to 15 Volt , and increase voltage (Buck- Converter) 10 Volt to 25 Volt. In this last project we used a PI controller to obtain good output (constant) of a series of DC - DC converter. But, there are still happen any fault om method deciding parameters of KP and KI. So, causing deformity as 6.4% on buck converter�s output within 15 Volt as setpoint, and 28% on boost converter within 25 as setpoint at maximum load. Keyword : Buck Converter, Boost Converter, PI controlle
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