Loop Gain Measurement for Buck Converter

Discussion in 'The Projects Forum' started by shahbaz khan, Oct 15, 2014.

  1. shahbaz khan

    Thread Starter New Member

    Mar 10, 2011
    5
    0
    I want to measure loop gain for Voltage Mode Controlled Buck Converter using Frequency Response Analyzer E5061B (agilent technologies). The loop response for the PID compensator is quite similar to the one obtained using simulation but the response for overall loop gain is very poor. it has a very low gain and small crossover frequency which is also unaffected by any change in compensator components. Has anyone had similar experience...!
     
  2. thodoris46

    New Member

    Jan 29, 2013
    10
    0
    give us circuit, schematic or block diagram
     
  3. shahbaz khan

    Thread Starter New Member

    Mar 10, 2011
    5
    0
    thanks for your reply. Here is schematic of the circuit.
    The hardware implementation is same except that the PWM signal is fed to switch (MOSFET IRF840) through driver (optocoupler TLP250).
     
Loading...