LLC charger for wide range of battery voltages

[cupoftea]

Hi,
The attached shows the Vout vs Freq graph for a 2kW LLC. (Half Bridge)
Vin is 390VDC.

It shows that between 50khz and 100khz, you can charge a wide range of battery voltages.
As such, i believe LLC is the best charging method for high voltage batterys, would you agree?
The LLC, with Full Wave bridge rectifier, and synch rects, suffers no overvoltage spikes on the output rectifiers (and sych rect fets) at all, thus its superior excellence for high voltage outputs.

With PSFB, you have to up-rate the sec-side sync rect fets in voltage due to the voltage spikes they are going to see....not so with LLC and FWB output (with sync rects, of course)

 

[Easy peasy]

are you gonna do full current at 220kHz ... ?

 

[cupoftea]

Thnaks, no only between 50-100khz.
And we beleive that when we do a current regulated output...the frequency will automatically go to the requisiste frequency. (ICE2HS01G controller)

 

[Easy peasy]

and for shorted output ? ( failed diode on o/p ) ... ?

 

[cupoftea]

We have a primary side current sense transformer...and the ICE2HS01G will pretty much shut it down if output diode goes short.
AYK, the shorted output diode problem is just as bad whether doing an LLC with output voltage regulation, or output current regulation.....so we have at least some relief from our worries.