ETAS
Half-bridges ("PS" Connection)
ES930.1
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User Guide
64
10.5
Switching States of a Half-bridge
10.5.1
Table of states of a Half-bridge
The following table shows an overview of the possible switching states of the
two MOSFET switches of a Half-bridge (see Fig.
59) depending
on the control signals of the Half-bridge channel group described above and
the Half-bridge.
10.5.2
State of the Half-bridges after switching on the Module
After switching on the module, the Half-bridges are blocked. In this state, the
high-side MOSFET switch as well as the low-side MOSFET switch are switched
off (see table of states in chapter 10.5.1 on
64).
For additional switch-on sequences of the Half-bridges, i.e. for every transition
from disable to enable, the low-side switch of each Half-bridge is briefly
switched on for approx. 200
s.
10.6
Interconnection of Half-bridges to Full-bridges
10.6.1
Grouping and Control
Two Half-bridges (power stages) can be interconnected to a Full-bridge for the
control of a load.
This grouping during the interconnection is recommended so that the jointly
used Error State diagnostics assembly can also be used for a Full-bridge (see
chapter 10.2.2 on
60). In case of an error state, this allows switching off
both channels of the power stage group used as Full-bridge together to protect
it.
The "Enable PS n/n+1" signal allows releasing or blocking one channel group
each, i.e. the two corresponding Half-bridges, if the Half-bridges are configured
as Full-bridges in the described groups.
Two digital output channels are required for the control of a Full-bridge. The
corresponding digital output channels must be configured so that a synchro
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nous control of the two interconnected Half-bridges is ensured.
Enable
Control
Power Stage n
PS n/n+1 PS n
Low-side Switch
High-side Switch
0
x
Off
Off
1
0
Off
On
1
1
On
Off
NOTE
The interconnection to a Full-bridge (H-bridge) is only possible for the perma
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nently assigned Half-bridge channel groups power stage 1/2, power stage 3/
4 and power stage 5/6.
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