AN1913D Freescale Semiconductor / Motorola, AN1913D Datasheet - Page 15

• Manufacturer Part Number: AN1913D
• Description: 3-phase BLDC Motor Control with Sensorless Back-EMF ADC Zero Crossing Detection using DSP 56F80x
• Manufacturer: Freescale Semiconductor / Motorola

PWM1 S
PWM2 S
PWM3 S
PWM4 S
PWM5 S
PWM6 S
POWER
SOURCE
DC VOLTAGE
I
I
I
A
B
C
At
Ab
Bt
Bb
Ct
Cb
Figure 5-2. 3-phase BLDC Motor Commutation PWM Signal
PWM1
A-off
A-off
A-off
3-PHASE POWER STAGE
commutation
PWM1
PWM2
0
S
S
PULSE WIDTH MODULATOR
(PWM) MODULE
BLDC control with BEMF Zero Crossing using ADC
AT
AB
Freescale Semiconductor, Inc.
Figure 5-1. PWM with BLDC Power Stage
PWM2 PWM3
C-off
C-off
C-off
commutation
For More Information On This Product,
60
MOSFET/IGBT DRIVERS
B-off
B-off
B-off
commutation
Go to: www.freescale.com
PWM3
PWM4
120
S
S
BT
BT
PWM4 PWM5
A-off
A-off
A-off
commutation
180
C-off
C-off
C-off
commutation
PWM5
PWM6
S
S
240
CT
CT
PWM6
B-off
B-off
B-off
commutation
300
A-off
A-off
A-off
DSP56F80X
commutation
360
C-off
C-off
C-off
3-PHASE BLDC MOT
A
electrical angle
Control Technique
B
C
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