ETAS
Half-bridges ("PS" Connection)
ES930.1
-
User Guide
61
The power MOSFETs are integrated in the Infineon TLE7182EM driver IC (see
chapter 13.9.8 on
100).
10.3.3
External operating Voltage
The power stages are not supplied by the internal operating voltage of the
power supply of the module, but by an external operating voltage which must
be connected to the "PS" connection.
10.3.4
Channel for Current Measurement (Current Sense PS n)
10.3.4.1 Overview
Fig.
10
-
2
Current Measurement Channel
The two Half-bridges of each channel group are equipped with one channel
each in the output branch for the current measurement (Current Sense PS n).
The channels for the current measurement feature identical designs in all Half-
bridges and consist of the following assemblies (see block diagram in Fig.
61):
• Anti-aliasing filter
• A/D converter
• Digital filter
– CIC filter
– IIR filter
– Digital filter jumpered
The functionality of all channels for current measurement can be configured
separately.
The Current Sense PS channel measures the current in the output path of the
Half-bridge and transfers the measured value to the application program. The
measured current is used as controlled variable for the control and monitoring
of the Half-bridge.
10.3.4.2 Anti-aliasing Filter
The anti-aliasing filter is a 1st order analog low-pass with a limit frequency of
15
kHz. The filter can be neither configured nor bridged.
NOTE
The six channels for the Current Sense PS n current measurement receive the
same setting of the sampling rate during the configuration.
Current Input PS n
M easure-
ment Unit
Current Sense PS n
Ant i
Aliasing
14 Bit A/D
Convert er
CIC
IIR
