Hitachi RAC-25YH4, Service Manual, Page: 71 / 121

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4. IPM (Intelligent Power Module)
• Fig.4-1 shows the intelligent power module and its peripheral circuit.
The three transistors on the positive e side are called the upper arm, and the three transistors on the
negative d side, the lower arm.
Fig. 4-1 Intelligent power module circuit (U
+
is ON, V is ON)
IP limitter
RAS_25_35_AW_055-086 2003.12.31, 10:59 AM 69