Hitachi RAM-50CNHZ2, Service Manual, Page: 82 / 107

– 90 –
11.Drive circuit
Fig. 11-1 shows the drive circuit.
The circuits for U phase, V phase and W
phase have the same Configuration.
●
Fig11-2, 0 to 5V chopper signal is output from microcomputer for each phase. The signal output from microcomputer is input to I
C, inverted
due to active LO, and 0 to 15V chopper signal is obtained. This signal is then applied to transistor gate of each phase to driv
e.
AX-6M00 MICRO COMPUTER
A
B
B
B
COMPRESSOR MOT
OR
IP
CUTTER
Id CONTROL
CIRCUIT
GR
Y
PWB (MAIN)
Fig. 11-1