Hitachi RAS-25WX8 Manuel De Maintenance page 98

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.
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Fig. 4-1 Intelligent power module circuit (U
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E E
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+ is ON, V is ON)
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E