CIRCUIT SCHEMATICS AND SIMULATIONS

The following images were captured during our DC/DC converter design sessions using PSpice, a Cadence Design Systems CAD software tool. This converter is the first one we created. It is designed to convert 24 volts to 48 volts. We decided to simulate this one first in order to understand better how DC-DC converters work. Our next step would be to create one that converts voltage from 24 volts to -48 volts to comply with the specifications given to us by Motorola.

1. Initial non-inverting boost topology converter ( DC 24V/DC 48V)

 
Notice the effect that the load resistance has on the output voltage.
circuit schematic output voltage without load resistance

output voltage with load resistance

 (it causes a small ripple)

Observe that the D1N4148 diode allows current to flow in the clockwise direction through the load resistance. Also, the inductor has only one coil to store and release the energy needed at the output. The load resistance causes a fluctuation in the output voltage of no more than about .75V above or below 48V.

 

 

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