Voltage converter A48
684_018
Voltage converter A48 converts the direct current of one voltage level into direct current of a different voltage level. On the Audi e-
tron GT, the voltage converter is needed in order to make direct-current voltage from the high-voltage battery (approx. 800 Volts)
available in the required voltage levels:
›
›
400 Volts for the high-voltage air conditioner compressor
12 Volts for the low-voltage electrical system
.
Voltage converter A48 is located over the centre of the front axle.
A voltage converter can convert the input voltage to a higher or lower voltage level; here, the voltage converter takes the input
voltage from the high-voltage battery and converts it into a lower output voltage. In other words, the HV voltage converter serves
as a step-down converter.
As a general rule, the HV voltage converter is set to operate as a set-down converter if:
›
›
›
The drive system is activated
The vehicle is being charged
The 12 Volt battery requires recharging
Notes for service and diagnosis
The voltage converter is maintenance-free. If defective, the entire unit must be renewed.
Diagnosis capability:
Adaption/calibration function:
Guided Fault Finding:
Special tools:
Yes
No
Yes
No
Maintenance-free:
Yes
Note on specified values for voltage converter A48
Input voltage
Output voltage Continuous current output
Peak current output Power output
HV voltage converter
800 V to 12 V
420 V ... 870 V 9 V ... 16 V
420 V ... 870 V 430 V
240 A
13 A
290 A
16 A
3.5 W
5.3 W
800 V to 400 V
172
English 
