Datasheet

6
Motor Control and Drive Design Solutions
BLDC Fan Motor Control
Need a highly integrated fan controller with a customizable
speed/temperature profile? Take a look at Microchip’s
PIC12HV and PIC16HV devices. These devices have a built-in
5V regulator and on-chip comparator to save system cost. The
rotor position is determined by a hall-effect sensor connected
to the on-chip comparator. The Enhanced Capture Compare
PWM (ECCP) Module uses this feedback information to drive
the motor by steering the PWM signal to the appropriate
motor phase. Temperature sensor inputs can be used to
create a unique fan speed profile and the application can
provide digital status information to a host device.
If space or time-to-market is a concern for your next project,
Microchip’s 3-phase full-wave sensorless drivers for
brushless DC (BLDC) motors are the answer. The devices
feature 180° sinusoidal drive, high torque output and silent
drive. With the adaptive features, parameters and wide
range or power supplies, they work standalone or with
Microchip’s broad range of microcontrollers.
FG
PROG
V
BIAS
OUT1
OUT2
PWM
DIR
V
DD
OUT3
GND
C1
C2
MTD6505
V DD
ECCP
N
S
Hall Sensor
PIC12HV615
12V DC
A
B
Temperature
PWM Command
I
2
C™
Commutation
& Speed
5V Reg
Comp
Brushless DC Motor Control
BLDC Motor Control
Looking for high reliability, high efficiency, and high
power-to-size ratio motor? The obvious solution is a
Brushless DC (BLDC) motor. It shares many of the same
torque and speed characteristics with the brushed
DC motor, but without the brushes. Technically it is a
Permanent Magnet Synchronous Motor (PMSM), but its
name comes from the simple method of commutation
and in some cases the stator windings are constructed to
match the non-sinusoidal commutation.
The simpler commutation methods allows the use of a
wide range of Microchip products, from 8-bit PIC16 MCUs
to MTD650X dedicated BLDC driver chips to dsPIC® digital
signal controllers. The device best suited to your
application depends on what you are trying to achieve:
performance, cost, efficiency, time to market, etc.
Microchip has a wide range of application notes and
development tools that allow you to get started with your
application quickly.
PIC
®
Microcontroller
or
Digital Signal
Controller
Gate Drivers
V
BUS
Inverter
Motor
Mechanical
Feedback
–
+
Op Amp
–
+
VREF
Comparator
BLDC Application Notes and Tuning Guides
Algorithm
PIC16
Family
PIC18
Family
dsPIC® DSC
Family
Sensored
AN857
AN885
AN899 AN957
Sensored Sinusoidal – – AN1017
Sensorless BEMF
AN1175
AN1305
AN970
AN901
AN992
Algorithm App Note
Sensorless Filtered BEMF with Majority Detect AN1160
Sensorless Dual-Shunt FOC with SMO Estimator and Field Weakening AN1078
Sensorless Dual-Shunt FOC with SMO and PFC AN1208
Sensorless Dual-Shunt FOC with PLL Estimator and Field Weakening AN1292
Sensorless Sing-Shunt FOC with SMO Estimator and Field Weakening AN1299
Tuning Guide: Sensorless BLDC Control with Back-EMF Filetering
Using a Majority Function
AN1160
BLDC Training
Class Title Language Recording Date Duration
Sensorless BLDC Motor Control
Using a Majority Function
English 04/29/2008 19 min.