Ultracapacitor with Converter

Open Script

This example shows how to use a DC-DC converter to maintain a constant load voltage when drawing power from an ultracapacitor. The converter supplies power to the load and the capacitor voltage drops. The protection circuit disconnects the load when the capacitor voltage drops below a threshold value of 4V. At 10 seconds, the generator turns on, supplies power to the load, and charges back the capacitor.

Open Model

Open Low Charge Protection Circuit Subsystem

View Simulation Results from Simscape Logging

This plot shows the voltage that the DC-DC converter and the generator supply to the resistive load. A low charge protection circuit disconnects the load when the ultracapacitor voltage drops below 4V. At 10 seconds the generator turns on, supplying power to the load, and charging the ultracapacitor.

Results from Real-Time Simulation

This example has been tested on these platforms:

  • Speedgoat™ Performance real-time target machine with an Intel® 3.5 GHz i7 multi-core CPU and 4 GB RAM.

  • dSPACE® SCALEXIO LabBox with Intel® Core XEON E3-1275v3 at 3.5GHz and 4 GB RAM.

You can run this model in real time with a step size of 20 microseconds by using the Simscape local solver. For small sample rates, a task overrun might occur during the initial task execution due to a cold cache. To avoid this overrun, if the selected platform supports these options, relax the start-up behavior by specifying a limited number of task overruns or increasing the sample time of periodic tasks during the start-up phase of the real-time application.

See Also

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