AN1913D Freescale Semiconductor / Motorola, AN1913D Datasheet - Page 36

• 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

Software Design
36
Omega_Required_Mech
Status_Commutation
The control algorithm of the BLDC motor drive with Back-EMF Zero Crossing using AD convertor, is
described in
Manual Speed
Setting
State Machine
Application
Figure 7-3
Process
Master
PVAL0,PVAL1
PC
ApplicationMode
BLDC control with BEMF Zero Crossing using ADC
Freescale Semiconductor, Inc.
and
Cmd_Application
For More Information On This Product,
Figure
Figure 7-4. Data Flow - Part 2
START/STOP
Switch
Cmd_Application
Go to: www.freescale.com
7-4.
Commutation Control
Cmt_Drv_RqFlag
PVAL2,PVAL3
PWM Generation
Process
Step_Cmt,
Process
Zero Crossing Offset
DC-Bus Voltage
U_Dc_Bus
Process
Setting
(A/D)
PVAL4,PVAL5
U_ZC3Phase
U_Dc_Half
ZCross Interrupt Flag
ADC Zero Crossing
Phase
Voltages
Checking
Process