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Advanced Motor Control Applications
BLDC Sensorless
Want to eliminate your Hall-Effect sensors and cabling cost
by going sensorless? PIC16 and PIC18 devices as well as
the dsPIC M/C DSCs are made for sensorless BLDC control.
The on-chip A/D or comparator sample the motor phase
voltages. From the zero-cross, the CPU determines the
rotor position and drives the motor control PWM module to
generate trapezoidal output signals for the 3-phase inverter
circuit.
Take a look at Microchip’s sensorless BLDC solutions:
■ AN1175 – PIC16F Back EMF with Internal Comparator
Zero Cross Detect and Majority Detection
■ AN1305 – PIC16F Back EMF with Internal Comparator
■ AN970 – PIC18F2431 Back EMF with External Comparator
Zero Cross Detect
■ AN901/AN992 – dsPIC30F Back EMF with A/D Zero Cross
Detect
■ AN1083 – dsPIC33F Filtered Back EMF with A/D Zero
Cross Detect
■ AN1160 – dsPIC33F Filtered Back EMF with Majority
Detect and A/D Zero Cross Detect
FIR ?ltering of the back EMF helps with high-speed motors
or motors with distorted back EMF signals. Majority detect
reduces the amount of time spent on motor tuning.
3-Phase BLDC Using PIC16F with PWM Output Steering
Zero Cross Detect
3-Phase BLDC Using PIC18F on dsPIC DSC with Back EMF
PIC16F1826
USART
SPI/I 2 C?
GPIO
GPIO
GPIO
Gate
Driver
Va
PIC18F MCU or
dsPIC ? DSC
PWM3H
BLDC
ECCP
P1A
P1B
P1C
Vb
BLDC
Motor
PWM3L
PWM2H
3-ph
P1D
Gate
Driver
PWM2L
PWM1H
PWM1L
FLTA
AN0
AN1
Fault
VDC
Inverter
IBUS
Comparator
Ref
Va
Vb
Vc
Gate
Driver
Vc
AN2
Demand
AN12
AN13
AN14
Phase Terminal Voltage Feedback
24V
24V
V CC
V CC
BOOT
HIGHDR
V CC
BOOT
HIGHDR
V CC
PWM1
MCP14700
MCP14700
PWM5
PWM HI
PHASE
PWM HI
PHASE
PWM2
PWM LO LOWDR
GND
Sense
Node
24V
Sense
Node
PWM LO LOWDR
GND
PWM6
V CC
V CC
BOOT
HIGHDR
PWM3
MCP14700
PWM HI
PHASE
PWM4
PWM LO LOWDR
GND
Sense
Node
+
V REF
MCP602X
-
6
Motor Control Design Solutions
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