LV 148: Electric and Electronic components for vehicles
LV 148 Standards are written for electric and electronic components for vehicles with a 48V Electrical System. This standard details a series of procedures for a test involving electrical normative bases and addressing the practical challenges for vehicle components and systems.
LV 148 covers electric and electronic components for vehicles within a 48V electrical system's test conditions. Topics and tests covered include tolerances, operating voltage ranges, and other standard values and specifications. With an increasing amount of completely electric vehicles manufactured every year, the LV 148 will remain relevant in the coming decades to ensure standards.
There are two main test setups LV 148 applies for voltage simulations and voltage dropouts.
Test setup for voltage simulation
DC source
Signal generator
Auxiliary equipment
Measuring devices
Test setup for voltage dropouts
DC source
Electronic switch
Signal generator
Auxiliary equipment
Measuring devices
In addition, the LV 148 standards apply to ground offset, short circuit signal and power line, standby current, the ground lost, internal dielectric strength, operations with/without functional limitation, over-voltage range, and under-voltage range tests.
Tolerances & Standard Values
Frequencies
±1%
Temperatures
±2 °C
Humidity
±5%
Times/durations
+5%; 0%
Voltages
±0.5%
Currents
±2%
Room Temperature
TRT = 23 °C ± 5 °C
Humidity
25 % (+ 5 % bis 0 %) to 75 % (- 5 % bis 0 %)
Test Temperature
Ttest = TRT
Operating Voltage
U48max
Source Impedance
10 mOhm ≤ Ri ≤ 100 mOhm
Terms
A, B, C, D in Diagrams
Functional status A, B, C,