Today’s release of QSPICE includes the ability to plot dissipation in devices. It’s implemented for resistors, capacitors, inductors, diodes, MOS level 1, VDMOS, and MOS level 2010; i.e., everything you need to model power devices.
This is actual dissipation in the device, not energy flow into the component, e.g., the power dissipated in the series and parallel losses of reactances. For the semiconductors, the device equations are fully replumbed to report only real current through real voltage, not current contributing to energy stored in the devices’ reactances. All the displacement currents are still in the simulation, but they don’t contribute to heating and aren’t added to the reported dissipation.
It’s off by default becuase it’s new and there’s a fair bit of compute overhead. To turn it on, add the SPICE directive
Ctrl-Left click on a device to plot dissipation. Ctrl-right click on a plot label to average.