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B.2 Back-EMF Detect Circuit
The YMCRPR8C25 uses filters, divider resistors and comparators to detect the Back-EMF in hardware.
Figure B-2 shows the Filter/Divider combination.
To Motor Outputs
Figure B-2: Back-EMF divider and filters
The outputs are then fed to comparators to detect the correct threshold for “zero-cross” in the motor. One
typical circuit is shown in Figure B-3.
Figure B-3: Back-EMF comparator
B.3 Temperature Sensor
The IPM (Intelligent Power Module) includes a Thermistor on the same substrate as the IGBTs. This is
used to measure the temperature of the transistor module, as is shown on the LEM GUI Display.
YMCRPR8C25 User’s Manual Rev 1.1
18/ 21
March 2008
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