Simple DC DC converter for electrical machine

Discussion in 'General Electronics Chat' started by mmehdi98, Aug 8, 2013.

  1. mmehdi98

    Thread Starter New Member

    Aug 8, 2013
    Hello Guys,

    I am new to this forum.
    Please help me to solve my problem.
    I am simulating a simple DC DC converter for electrical machine which is composed of a DC 50V supply in series connection with a switch (here IGBT) and at the output a resistance as load,that i want to vary for different scenarios.I have a DC square wave at o/p.I want to filter this to pure DC,and when I use a shunt Capacitor at the end in parallel with my load,the voltage is filtered with some ripple but when I change the duty cycle at switch,the o/p doesn't vary accordingly.(But it should vary when the duty cycle is changed)..
    Whats the problem?Can anyone suggest some solution?
  2. SgtWookie


    Jul 17, 2007
    I see no mention of an inductor, which would cause what you are seeing.

    Post your complete schematic, and what frequency and duty cycle range you want to operate with.