System Description - Motorola M68HC08 Reference Manual

System Description

Designer Reference Manual
16
Freescale Semiconductor, Inc.
Power line
DC-Bus Voltage/
Current
Temperature
ADC
PC Master
SCI
START
STOP
Required
Speed
SPEED
Required
Alignment
Current
During the rotor alignment state, the dc-bus current is controlled by the
current PI regulator. In the other states (motor running), the phase
voltage (PWM duty cycle) is controlled by the speed PI regulator.
System Description
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DC Bus Current &
DC Bus Voltage
Sensing
3 BEMF Voltage
Zero Crossing
Comparators
3 phase BLDC
Power Stage
MUX
BEMF Zero
MUX
Crossing
Command
signal
Digital
Digital
Inputs
Outputs
Zero
Zero Crossing
Crossing
Time moment
Zero Crossing
Period, Position
Recognition
Commutation
Period
1/T
Actual Speed
Speed PI
Regulator
Actual
Current
Current PI
Regulator
(for Alignment)
Figure 2-1System Concept
Three-Phase
Inverter
BLDC
PWM
PWM
Generator
with
Dead Time
Commutation
Control
Duty
Cycle
HC08MR32
DRM028 — Rev 0
MOTOROLA
3-ph
Motor