Hello,
I am studying the design of DC fast chargers.
I learned some information about their varieties and the approximate principle of operation (Vienna Rect. - LLC DC/DC - Output).
Usually, after Vienna Rectifier, you can get a maximum voltage of about 840VDC, and then lower it to the desired level using a DC/DC converter.
Most electric vehicle models have battery voltages in the range of 345 - 480VDC.
The exception is the Porsche Taycan, which has an 800V battery.
It is charged by CCS, which can reach 920VDC.
As I understand it, usually the charging modules that make up the fast chargers give out 250-750VDC.
Further, they are already connected in parallel, for a set of high power.
I wondered how the CCS outputs such a high voltage (Up to 920VDC), if usually the modules produce up to 750VDC (which is enough for CHAdeMO).
Are they using other DC/DC designs (Buck-Boost) or simply combining serial and parallel connection of charging modules to increase the voltage?
Or is this voltage the sum of DC (up to 750V) and AC on the CCS plug?
Thank you!
I am studying the design of DC fast chargers.
I learned some information about their varieties and the approximate principle of operation (Vienna Rect. - LLC DC/DC - Output).
Usually, after Vienna Rectifier, you can get a maximum voltage of about 840VDC, and then lower it to the desired level using a DC/DC converter.
Most electric vehicle models have battery voltages in the range of 345 - 480VDC.
The exception is the Porsche Taycan, which has an 800V battery.
It is charged by CCS, which can reach 920VDC.
As I understand it, usually the charging modules that make up the fast chargers give out 250-750VDC.
Further, they are already connected in parallel, for a set of high power.
I wondered how the CCS outputs such a high voltage (Up to 920VDC), if usually the modules produce up to 750VDC (which is enough for CHAdeMO).
Are they using other DC/DC designs (Buck-Boost) or simply combining serial and parallel connection of charging modules to increase the voltage?
Or is this voltage the sum of DC (up to 750V) and AC on the CCS plug?
Thank you!