Lab Power Supply for AutoBox
For experiments with the AutoBox in a laboratory, you can use a
laboratory power supply instead of the car battery. If you use
AutoBox up to Version 3.0 with a lab power supply, note the
requirements and information provided below.
These guidelines are not relevant for AutoBox Version 4.0
and later.
Objective
n The specified input voltage for the AutoBox power supply (8 V …
60 V DC normal operating range) must not be exceeded.
n Your laboratory power supply must be able to supply approx. 240
W continuous output power. This means, for example if all slots in
the AutoBox are filled:
n At 12 V nominal input voltage your lab power supply must
provide 20 A.
n At 60 V input voltage (max. permissible) your lab power supply
must provide 4 A.
Good results have been optained with 24 V-laboratory power
supplies.
n If your lab power supply provides adjustable current limiting: Use
always the maximum value.
n The AutoBox needs nearly 50 A start‑up current on power‑up for a
few ms (regardless of the input voltage and the load). If your lab
power supply does not provide this current, you can take the
following measures:
n Connect a capacitor parallel to the output pins of the lab
power supply. It works like a current reservoir to reduce the
load on the lab power supply during turning on the AutoBox.
n The capacitor should be generously dimensioned and must be
certified for the selected input voltage.
The capacitor provides the needed start‑up current only
if it is charged. Therefore you must switch on the lab
power supply long enough before you switch on the
AutoBox.
Guidelines
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dSPACE Expansion Boxes
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DS1103 Hardware Installation and Configuration November 2014
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