Technical Information Site of Power Supply Design

2022.01.26 Simulation

Execution of Simulations

About the ROHM Solution Simulator

The method of execution of simulations in the ROHM Solution Simulator is here explained. Those persons who have not read any introductory articles prior to this one should consult "Starting a Simulation Circuit in the ROHM Solution Simulator" to start up the example simulation circuit. The following link can also be used to start the simulation directly. https://www.rohm.com/solution-simulator/buck_converter_vo250v_io20a 

For a quick introduction to methods of operation, please refer to the “Hands-On User’s Manual(PDF)”.

Execution of Simulations in the ROHM Solution Simulator

When the simulation circuit starts, a simulation screen is displayed, as in Fig. 1. To execute the simulation, click the Run button () on the circuit diagram toolbar.

Fig.1. Execution of simulation in the ROHM Solution Simulator

When the simulation begins, the Run button () changes to a red square () like that in Fig. 2. Moreover, a small window opens, and the type of simulation being executed (in Fig. 2, Time-Domain), the time for which the simulation is being executed (in Fig. 2, 2 ms), and the execution status are displayed. The simulation time (2 ms) is not the actual time required for the simulation, but the simulated time setting--meaning, for example, that the circuit action is to be simulated for a time interval of 2 ms starting from the time power is supplied.

Fig. 2. Display of the circuit diagram toolbar during simulation execution

When the simulation progress reaches 100%, the waveforms in the circuit diagram display area are updated. Upon clicking the red square button (), the simulation is halted in mid-progress. However, it cannot be restarted.

Simulation settings can be changed by clicking on the Simulation Settings icon (Fig. 3). Simulation settings are set in advance according to the selected simulation circuit. The simulation type cannot be changed.

Fig. 3. Changing simulation settings using the Simulation Settings icon

Simulation results can be displayed as signal waveforms at different nodes using a Waveform Viewer tool. The display method is explained in the next article.

Key Points:

・To execute a simulation in the ROHM Solution Simulator, after starting up a Solution Circuit, click the Run button () on the circuit diagram toolbar.

・Upon clicking the Simulation Settings icon, simulation settings can be changed.

・Simulation results can be displayed as signal waveforms at different nodes using the Waveform Viewer tool.

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