dSPACE DS1103, Hardware Installation And Configuration Manual

Page: 285 / 302

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 285
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