Werbung
Verfügbare Sprachen
Verfügbare Sprachen
7.
Upper Arm Drive Circuit
Fig. 7-1 shows the upper arm drive circuit.
The circuit configuration is completely the same for phases A, B and C.
A*phase
R402A
(8)
I
(5)
ee
a
) (
C\Evt
D403A D404A
C402A
OQ Bw+
Fig. 7-1
Current at point ®
Forward
current
Ox
Fig. 7-2
Forward Current Waveform at Point @
e@
As described in the rotor magnetic pole position detecting circuit, the upper arm drive circuit supplies
current to the bases of the transistors on the power module's positive
© side which tur on or off
according to the position detection signals. The signals according to the position detection signals are
output from pins
@,@
and © of the micro computer and are input to pins @ of photocouplers
PQ401A—PQ403A via driver IC1.
- 172 -
Werbung
