Cypress FM3 Series Handmatig - Pagina 12
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3.2
Over-current Protection Circuit
To prevent the damage to the IPM caused by the unexpected huge current. The system needs over-current
protection circuit
1
Compute the output as follow:
=
∗ �
3
147 + 148
Where:
As mentioned in the specification of IPM, the self-protection function will be trigged if the voltage on the fault pin
is higher than 0.5V. Then, it is easy to calculate and adjust the threshold value that trigs the over-current
protection.
FM3, MB9AF110K, 32-Bit ARM
Figure 6
to detect the current surge.
Figure 6. Over-Current Projection Circuit
148
146
+ 1� ∗ ( )
� ∗ �
145
= voltage to fault pin of IPM
, , = voltage between shunt resisters
®
®
Cortex
- M3 Washing Machine Evaluation Board, Doc. No. 002-04443 Rev. *A
2BHardware
12