Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
||Thread Tools||Search this Thread|
|2nd September 2012, 10:41 AM||#1|
Join Date: Jun 2011
LLC converter operating in capacitive region
The below is a basic (LTSpiceIV) simulation for a LLC converter which is to supply a 175W , full-bridge class D amplifier.
(LTspice IV is a free download from linear.com)
The upper resonant frequency of this LLC stage is 128KHz.
However, in the simulation attached, the fets are switching at 80KHz.
-in other words, the LLC converter is being operated deeply in the “capacitive region”.
In the capacitive region, the antiparallel diodes in the fets should be being severely reverse recovered……….creating very large switching losses and lots of emc noise.
However, the simulation shows perfectly acceptable operation…..without the reverse recovery and with no great dissipation in the fets
[it is page 5, RHS of this which tells of the woes of the “capacitive region” in an LLC resonant converter.
Howcome this LLC simulation, operating at too low a frequency, in the “capacitive region”, is operating OK?
|Thread Tools||Search this Thread|
|Thread||Thread Starter||Forum||Replies||Last Post|
|1kW LLC converter||chas1||Power Supplies||69||2nd September 2013 02:32 PM|
|LLC converter||eem2am||Power Supplies||0||26th August 2012 08:05 AM|
|Biasing and safe operating area region||Shelah||Solid State||10||16th April 2012 11:18 AM|
|Problems with LLC resoant converter||eem2am||Power Supplies||2||20th December 2011 07:51 PM|
|New To Site?||Need Help?|