Werbung
@
When pin @ of the micro computer then goes "Lo" — "HI" a photocoupler between PQ2 pins @ and @
turns off and the reverse bias current flows to C401 — power module's Eu* terminals —~ But terminals >
R404 — PQ2 to cut off the upper arm transistors. (Fig. 7-3)
Power modul
Oa
Reverse
Fig..7-3
Waveform of Transistor Base Current (Reverse Current at Point @ )
® R407 is used to charge C401 initally.
@ The operation is the same for V* and W* phases.
— 136 —
Werbung
