# Thermal models in soft switching, Eoss accounting **URL:** \ **Category:** PLECS\ **Tags:** thermal-model\ **Created:** [April 10, 2026, 9:27pm UTC](https://forum.plexim.com/t/thermal-models-in-soft-switching-eoss-accounting/2978 "2026-04-10T21:27:00Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![nosilverman](https://avatars.discourse-cdn.com/v4/letter/n/c6cbf5/32.png) [@nosilverman](https://forum.plexim.com/u/nosilverman)\ **Post date:** [April 10, 2026, 9:27pm UTC](https://forum.plexim.com/t/thermal-models-in-soft-switching-eoss-accounting/2978/1 "2026-04-10T21:27:00Z")
For the thermal models, is the turn-on and turn-off energy data accurate for soft switching, or is it double-pulse-test (DPT) data? The DPT assigns Eoss stored energy to turn-off rather than turn on, so the sum is correct (hard switching), but it is not accurate for ZVS turn-on. Do I need to manually correct for Eoss for a ZVS turn-on converter? Best, Noah ---
**Author:** ![Bryan\_Lieblick](https://dub1.discourse-cdn.com/flex006/user_avatar/forum.plexim.com/bryan_lieblick/32/10_2.png) [@Bryan\_Lieblick](https://forum.plexim.com/u/Bryan_Lieblick)\ **Post date:** [April 13, 2026, 3:15pm UTC](https://forum.plexim.com/t/thermal-models-in-soft-switching-eoss-accounting/2978/2 "2026-04-13T15:15:39Z")
Hi Noah, The answer depends on the thermal model you are using and how it is implemented. Some semiconductor vendors include an [additional term `+lookup('Eoss', v, T)`](https://forum.plexim.com/t/zero-switching-losses-on-synchronous-boost/2775/3). Others do not specifically include the Eoss losses or fold them into the Eon/Eoff tables, but the distinction becomes critical at light loads or ZVS where the Eoss losses can dominate. This also was the topic of a great talk at [APEC this year by Wolfspeed](https://apec2026.eventscribe.net/fsPopup.asp?PresentationID=1716326&mode=presInfo), noting that other vendors (but not all) include this loss mechanism as well. Regards, Bryan