Set up a switched mode power supply simulation (Boost converter)

In the first four tutorials, we already practiced how to model a boost converter with a solar system. In this tutorial, we will try to build a voltage mode PWM controller by using a boost converter. The example we’re going to use is seems as general sample on boost converter modeling which is required for maximum power point control of solar cell as below. The upper part of the schematic is a voltage source, a boost converter and its load; the lower part is a PWM controller which senses the voltage and compares it in order to controls the switch (the MosfetLevel0) of the boost converter. Hence in this schematic, we have four parts as below: Boost converter, load, error amplifier which senses the voltage from load, and the comparator which sends the PWM control signal to the switch.

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To build the above schematic, the necessary components are as below. To select the components from component list, find out the location of the necessary component, left-click the component and release the mouse button, and then move your mouse cursor into the workscreen and left-click again. The parameters of each component are shown in brackets behind. Right-click components for editing the required parameters.

Using components:

We can find the above components in the following paths:

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Simulation parameters: (Go to Simulation/Simulation Parameters or click the short-cut button in the menu bar)

After configuring all the necessary parameters, go to Simulation/Start simulation to execute the simulation or click the short-cut button in the menu bar and get the following result.

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The output voltage of the boost converter: V_3

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The blue curve stands for the current value of the inductor L1, and the red curve for the current value of the diode D1. We can see the current value of D1 depends on the on or off of the switch which is controlled by the PWM controller.

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The blue curve stands for the feedback voltage V_1. The red curve stands for the voltage which is compared with the reference voltage. And the sky blue curve is the calculated signal from comparator and used for controlling the switch.

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