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参数资料
| 型号： | APGDT002 |
| 厂商： | Microchip Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC MICROCONTROLLER |
| 标准包装： | 1 |
| 工具类型： | CAN 总线分析器 |
| 适用于相关产品： | PC 至 CAN 通信 |
Supporting the Advancements Toward a Beltless Vehicle
The trend toward a beltless vehicle continues to build
momentum as the demand for innovative solutions
with a small footprint to support the consumer’s
demand for improved fuel economy and reduced
emissions, PIC?microcontrollers and dsPIC?digital
signal controllers provide an innovative suite of on-chip
peripherals coupled with wide range of performance
options that support the development of precision
motor control systems. BLDC motors usage is growing
due to the affordability of their operations being more
The on-chip A/D converter samples the motor phase
voltages. From the voltages, the CPU determines the
rotor position and drives the motor control PWM module
to generate trapezoidal output signals for the 3 phase
inverter circuit.
FIR Filtering of the BEMF helps with high-speed motors
or motors with distorted BEMF signals. Majority Detect
reduces the amount of time on motor tuning.
3-Phase BLDC with BEMF
energy ef?cient, quieter, with a greater range and
extended life.
For example, in a brushless fuel pump design, the
innovative electronically commutated three phase
motor eliminates the need for mechanical brushes. As
a result, reduced power consumption is achieved due
PIC18F MCU or
dsPIC ? DSC
PWM3H
PWM3L
PWM2H
PWM2L
PWM1H
PWM1L
3-ph
Inverter
BLDC
to the elimination of friction caused by the brush to
commutator interface and functionally enhanced due
to the ability to have variable output to allow the fuel
pump to operate at speeds which match the engine’s
demand. Plus with Microchip’s sensorless ?eld-oriented
control algorithm which uses the single cycle MAC
FLTA
AN0
AN1
AN2
AN12
AN13
AN14
Fault
VDC
Demand
IBUS
p product
Cost
p portfolio of
microcontroller
d devices from
Microchip
with data saturation, zero overhead looping and barrel
shifting to achieve stunning performance.
T The broad
Relative
dsPIC33F/
dsPIC30F
DSC
PIC18F
MCU
PIC16F and analog
MCU
Sensorless BLDC, Back EMF
Low Speed High Speed enables creative
FOC solutions for
motor control
Application/Control Complexity challenges
within the
vehicle. The Enhanced Capture Compare PWM
Peripheral (ECCP) module found on some devices in
the PIC16/18 families of microcontrollers is optimized
for controlling ? bridge or H bridge motor drive circuits.
Plus it can be used for BLDC motor commutation or
stepper motor control as shown in the brushless fan
control illustration.
BLDC Sensorless
Phase Terminal Voltage Feedback
BLDC Fan Control
Need a highly integrated fan controller with a
customizable speed/temperature pro?le? Take a
look at the PIC12HV and PIC16HV families. With a
on-chip 5V regulator and comparator, the system
designer is able to reduce components on the board
and associated system costs. The rotor position is
determined by a Hall effect sensor connected to the
on-chip comparator. The Enhanced Capture Compare
PWM (ECCP) peripheral uses the 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 pro?le and the PIC
MCU processes the information and transfers digital
status to the vehicle’s body computer module.
Fan Control Application Using PIC? MCUs
12V DC
Commutation
Want to reduce the vehicle weight and cost of Hall
effect sensors and wiring harness cabling by going
sensorless? Take a look at the PIC18, PIC24 or
PIC ? MCU
5V Reg
& Speed
Hall
Sensor
N
dsPIC33 families for your sensorless BLDC solutions.
FIR ?ltering of the BEMF and/or using Majority Detect
can help with high speed motors or motors with
distorted BEMF signals.
Temperature
PWM Command
I 2 C?
Comp
ECCP
A
B
S
www.microchip.com/motorcontrol
8
Automotive Capabilities
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