Hitachi RAF-25FX8 Service Manual page 108

5. Power Circuit for P.W.B
• Fig. 5-1 shows the power circuit for P.W.B.
• In the power circuit for P.W.B., power supply for microcomputer, peripheral circuits
circuit and, as well as DC 35V, are produced by switching power circuit.
• Switching power circuit performs voltage conversion effectively by switching transistor IC1 to convert
DC 330V voltage to high frequency of about 20kHz to 200kHz.
A C 2 2 0 - 2 3 0 V
– 126 –
Microcomputer
, and IPM driver