Circuit design using "PSIM" (Buck and Cuk type regulators)

in #technology2 years ago

  I am a student of electronic engineering from the Simón Bolívar University of Venezuela (USB), a few quarters ago I was in the course of “Electronics of industrial acquisition and processing systems 2” In this class was assigned the task of designing a different power supply values using Buck,Cuk, regulators, to be used in some blocks of the electric vehicle, using the simulator PSIM.

  Specifications:

  Acquisition Stage:

  • -24 V @ 200mA.

  • 5 V @ 100mA (95% efficiency).

  Processing Stage:

  • 3.3 V @ 10mA (95% efficiency).

  • 5V @ 1A.

  Process:

  Regulator to obtain -24V @ 200mA:

  The Cuk model was implemented.

  For simplifications, the same value was taken for both inductors and capacitors. A switching frequency of 100 Khz was raised.

  The load resistance was obtained by ohm's law, giving 120Ω.

  K: 0.33.

  An inductor value of 10mH was taken as reference. A 10mA and 100mV curl at the output. Obtaining a capacitor value of 201nF.


CUK type regulator using PSIM. (Own image)


Graph of output voltage and current in PSIM (Own Image)

  Regulator to get 5V @ 100mA:

  The Buck model was implemented.

  For simplifications, the same value was taken for both inductors and capacitors. A switching frequency of 100 Khz was raised.

  The load resistance was obtained by ohm's law, giving 50Ω.

  K: 0.104.

  A 10mA and 5mV curl was taken at the output. Obtaining a capacitor value of 250nF and 12mH was obtained for the inductor. That is, an inductor less than 12mH and a capacitor greater than 250nF are required.


Buck type regulator in PSIM. (Own image)


Current and output voltage graph in PSIM. (Own image)

  Regulator to get 3.3V @ 10mA:

  The Buck model was implemented to simplify the same value for both inductors and capacitors. A switching frequency of 100 Khz was raised.

  The load resistance was obtained by ohm's law, giving 330Ω.

  K: 0.10.

  A 1mA and 33mV curl was taken at the output. Obtaining a capacitor value of 36nF and for the inductor 120mH was obtained. That is, an inductor less than 120mH and a capacitor greater than 36nF are required.


Buck type regulator in PSIM. (Own image)


Graph of current and output voltage in PSIM. (Own image)

  Regulator to get 5V @ 1A

  The Buck model was implemented.

  For simplifications, the same value was taken for both inductors and capacitors. A switching frequency of 100 Khz was raised.

  The load resistance was obtained by ohm's law, giving 5Ω.

  K: 0.104.

  A 10mA and 25mV curl was taken at the output. Obtaining a capacitor value of 50nF and for the inductor 12mH was obtained. That is, an inductor less than 12mH and a capacitor greater than 50nF are required.


Buck type regulator in PSIM. (Own image)


Graph of current and output voltage in PSIM. (Own image)