- AC converted to DC (with power factor correction, usually means AC stepped up 1st)
- DC converted back to AC (but higher voltage) and MUCH higher frequency
- AC transformed to lower AC voltage (still higher frequence)
- AC rectified to DC (filtered and stabilized), DC voltage lower
That's not true. Tesla works like this:
1. You have a high-voltage DC bus that is basically connected to all battery modules. Modules have individual BMS modules and can connect/disconnect to that bus.
2. If you're doing fast charging, the charger connects to that bus directly (you can hear contactors closing), matches the voltage and pushes the current.
3. If you're doing AC slow charging, the charging module on the Tesla simply boosts the voltage to the bus level via a PWM-based power supply.
