ST72141 BLDC Inverter AirCondition Demo Kit - PowerPoint PPT Presentation


Title: ST72141 BLDC Inverter AirCondition Demo Kit


1
ST72141 BLDC InverterAir-Condition Demo Kit
  • Feb 2004

2
ST72141 Air-Condition Demo Kit Presentation
Contents
  • A.Inverter Air-Condition Background
  • B. BLDC Motor Basics
  • C. ST72141 Air-Condition solution description
  • - whole Air-Condition Demo Kit
  • - Indoor unit
  • - outdoor unit
  • - Summary of Benefits of ST72141 solution
  • D. How to start with ST Air-Condition Demo Kit

3
Air-Condition system
  • Air-condition Compressor, 4 way valve, fan,
    evaporator, condenser
  • 4-way valve control cool or heat mode

Cool mode
Heat mode
4
Inverter Air-Condition Background (1)
  • Environment Friendly
  • Reduce waste of energy Variable Refrigerant Flow
    Air-Conditioners and Refrigerators provide energy
    saving of up to 40
  • The electricity demand increases faster than
    electricity supply Governments are implementing
    regulations to save on electric equipments
    efficiency
  • 95 of Japanese household use Inverter
  • air-conditioner
  • Enhanced Comfort Performance
  • Create friendly user interfaces
  • fine temperature regulation
  • Inspect whole Air-Condition system

5
Inverter Air-Condition Background (2)
  • Inverter Air-Condition Benefit
  • Lower electricity consumption
  • Fast get target temperature
  • Stable reliable temperature control
  • Silent operation

US
SEMI-CONDUCTOR DRIVE
ELECTRO-MECHANICAL DRIVE
VARIABLE FREQUENCY (3-phase Brushless DC
Compressor)
MCU DRIVER IGBT
15
FIXED FREQUENCY (Single phase Induction
Compressor)
4
BI-METAL THERMOSTAT
Efficiency
2
6
Inverter Air-Condition Background (3)
  • Inverter Air-Condition in China Market

7
Inverter Air-Condition Background (4)
  • 3Ph. Brushless Motors Explosive Growth

Source Forward Concepts 2000 and Motorola
Semiconductor Products
8
ST72141 Air-Condition Demo Kit Presentation
Contents
  • A.Inverter Air-Condition Background
  • B. BLDC Motor Basics
  • C. ST72141 Air-Condition solution description
  • - whole Air-Condition Demo Kit
  • - Indoor unit
  • - outdoor unit
  • - Summary of Benefits of ST72141 solution
  • D. How to start with ST Air-Condition Demo Kit

9
BLDC Motor Basics (Generalities)
  • Also called brushless Permanent Magnet DC (BLDC)
    or synchronous DC motor
  • Advantages
  • High efficiency (up to 98)
  • Variable speed
  • Silent operation
  • Reliable/long life time (no brushes)
  • High Size/Power ratio
  • High torque at start-up
  • Same stator as Induction 3 phase motor
  • Drawbacks
  • Overall system cost due to cost of electronic
    control

10
PMDC Basics (1)
  • Operating principle
  • Synchronous Stator flux and rotor mechanical
    rotation speed are same.
  • Stator description 3 phase winding (1 or 2 or
    more pairs of poles)
  • Rotor description Permanent magnet
  • For 1 pair of pole 1 electrical cycle (6 steps)
    1 mechanical cycle

11
One pair pole motor
12
PMDC Basics (2)
  • Drive mode 6 steps Principle

Current in winding A,B,C
300V DC
T1
T5
T3
A
U
V
B
W
C
2
T4
T6
T2
-
T1 T1 T3 T3 T5 T5 T4 T6 T6 T2 T2 T4
13
PMDC Basics (3)
  • Control Method
  • It requires to know the position of the rotor at
    all timesin order to reach the status of auto
    commutation (best efficiency). At least 2 common
    ways are available to know the rotor position.
  • Hall effect sensors (sensor mode)
  • Back emf (1) detection (sensorless mode)
  • The autocommutation happens when the current in a
    winding is in phase with the b-emf in this same
    winding.
  • The control process will be about keeping these
    2 signals in phase
  • Current generated by inverter in the motor
    windings
  • Back-emf Voltage induced (by Permanent Magnet) in
    the motor windings
  • (1) B-emf is the voltage induced in a winding by
    the movement of the magnet in from of this
    winding edj/dt. It is independant of
    the energy supply to the motor (just by spinning
    by hand the rotor for example it is
    possible to generate back-emf).

14
Implementation of control B-emf detection
Conventional Method (1)
300V
BUS
BUS
divider filter
N
N
5V
N
N'
N'
POWER GND
POWER GND
POWER GND
virtual ground
weaknesses - Voltage dividers give reduced
sensitivity difficulty for low speed operation
- Filtering is optimised for narrow speed
range
15
Implementation of control ST72141 patented
Sensorless method
300V
T1 PWM "ON"
A
V/2
B
C
bemf
T4 always ON
GND
  • back-EMF whole signal sensing
  • high sensitivity large speed range very
    low speed operation starting with full torque
  • no filtering delay
  • high signal to noise ratio

16
ST7141 Back-emf detection Patent
NO PATENT INFRINGMENT REDUCED COST
17
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
18
whole Air-Condition Demo Kit
  • Features
  • - Full Air-Condition Solution - Fuzzy Control
    Temperature
  • - 24V BLDC Motor (Extend - KANDA KIT
    Air-Condition mode
  • to real compressor with HV Board)

19
Air-Condition Demo Kit Control Unit
Indoor UNIT ST72324
Air-Condition Indoor Unit
  • Indoor Unit
  • - LED display
  • - Infrared remote controller signal
  • - 2 Temperature Sensor
  • - Fan PG motor
  • - Swing stepper motor
  • - Buzzer
  • - UART communication
  • Outdoor Unit
  • - 3 Temperature Sensor
  • - Current Voltage Sensor
  • - Compressor(BLDC motor)
  • - 4-way Valve
  • - Outdoor cooling Fan motor
  • - LED display
  • - UART communication

Display
Main Relay
Buzzer
Remote controller
PG Motor
Environment Temperature Sensor
Fan
Stepper Motor
Evaporator Temperature Sensor
Swing
SCI Communication
Environment Temperature Sensor
  • Outdoor UNIT
  • ST72141

Fan
Condenser Temperature Sensor
4-way valve
Compressor outlet Temperature Sensor
IGBT or IPM
Current Sensor
Voltage Sensor
BLDC Motor Compressor
Air-Condition Outdoor Unit
20
Air-con running mode and functions
  • Air-con running mode and functions

21
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
22
Low Cost High efficiency Digital Control
  • Features
  • 5 Mode Cool, Heat, Auto etc.
  • Full function sleep, Timer etc.
  • Infrared remote control
  • Fuzzy Temperature Regulation
  • Compressor Frequency display
  • Accurate Fan Motor control
  • C language
  • Main Components
  • MCU ST72324
  • Switch kit Triac,ULN2003
  • L7805?L7812
  • LED display, Buzzer, Relay, etc.
  • ST72324 Features
  • 8K to 32K Flash
  • PLL for 2x frequency multiplication
  • SCI SPI communication interface
  • 42/44 Pin, 32/24 multifunctional I/O
  • 10-bit ADC

23
Whole Air-Condition function
  • Indoor Unit Topology

24
Fan PG motor control Phase Angle Control
  • Fine control feature
  • Accurate Fan speed controlPI
  • Speed detection TimerINT
  • Zero crossing detection Timer INT

25
Communication SCI
  • Feature
  • Half-duplex Uart, Master/Slave
  • 1K baud rate
  • 8 data bits,1 start bit ,1 stop bit per byte
  • Communication Topology

26
Indoor Unit Application
27
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
28
The complete Kit for 3 Phase Motor drive
  • FEATURES
  • Variable Speed or test mode
  • Enhanced Digital Speed Regulation
  • Compressor protect (CUR , VOL, IPM etc.)
  • Auto-defrost
  • COMPONENTS
  • ST72141 MTC, 34pins, 8K OTP/ROM
  • Three L6368 power interface drivers
  • Six STGWNB60 IGBTs power drive
  • Viper12 non isolated supply

INVERTER
Bridge Rectifier
L638X
L638X
L638X
STBR408 STBR608
L6386
STGW20NB60HD
LED
4Way valve
Cooling Fan
Sensors
29
ST72141 Summary
  • ST72141 Feature Set
  • 8K ROM/OTP/EPROM
  • 14 multi functional bidirectional I/Os with
    external interrupt
  • Two 16-bit Timers with
  • 2 input captures 2 output compares External
    clock input PWM and pulse generator mode
  • SPI synchronous serial interface
  • 8-bit ADC with 8 channels
  • SDIP32 or SO34 package
  • Enhanced reset (on-chip) system
  • Low voltage supervisor
  • 3 power saving modes
  • Configurable watchdog reset
  • Motor Control Cell
  • Commutation step control Voltage mode /
    Current mode
  • Sensor or Sensor-less motor phase commutation
  • Back-EMF zero-crossing detection (as low as
    200mV)
  • Real time motor winding demagnetization detection
    for fine-tuning the phase voltage masking time to
    be applied before back-EMF monitoring
  • Automatic and programmable delay between back-EMF
    zero crossing detection and motor phase
    commutation

30
Outdoor Unit Application
BLDC Motor Speed Control (PI)
Init Main loop
LED, Fan 4way valve Relay etc.
Communication Set send Data Receive data decode
Err detection etc.
VOL, CUR Protection etc
Set target speed
ADC
C,D event Handle
Ports
PWM Duty cycle
BEMF Detection
Timer and INT
31
Sensorless starting procedure
  • 1/ Define a rotor starting position
  • ex phase A is grounded, starting current is
    risen into phase BC simultaneously
  • 2/ Define a constant acceleration starting ramp
  • First step-time and acceleration are depending on
    system inertia motor torque (see example here
    below)
  • 3/ Start by positioning the rotor (typically few
    100msec), then increase the current (torque) and
    sequence phase configuration according to
    step-time ramp enable b-emf detection from
    beginning, wait for two successive detection
    before to swap to auto-commutated mode

32
Control Principles of PMDC Maximum efficiency
with delay manager
33
ST72141 Regulation loops(simplified diagram)
Target Motor Speed
Step Time
Motor
P.I.D or Fuzzy regulation
b. emf
I
Feedback Speed
Motor efficiency regulation loop
Speed regulation loop
34
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
35
Benefits of ST72141 solution(1)
  • Patented Sensor Less back-EMF Control method
  • Only 3 standard resistors as external components
    for back-emf sensing
  • Embedded current loop and reset circuit
    minimises external components
  • Suitable for motors from 12V to 300V
  • Allows Voltage and Current mode control of Motors
  • Hardware Co-processor with an Industry standard
    8bit MCU
  • 8bit core accessibility, fast learning curve and
    time to market
  • Short and Low project development cost.
  • Low power consumption of MCU (15mA) allows for
    smaller supply than DSP
  • 8Mhz clock frequency generates lower EMI than DSP
    running at 20 or 40MHz
  • Internal HW 8bit multiplier and divider (70 of
    CPU resources free)
  • Allows running of your own BLDC in a few minutes
    with KANDA mode.

36
Benefits of ST72141 solution(2)
  • Cost Effective Appliances
  • Lower cost than available DSP offer
  • Dedicated Motor Control cell to free CPU
    resources
  • C language( indoor unit) .Short and Low project
    development cost.
  • User Friendly
  • Air-Condition status display Interfaces
  • Auto-defrost
  • Enhanced warning visuals
  • Extended Reliability
  • IGBT or IPM error detection
  • compressor over current protection
  • compressor over temperature protection
  • Enhanced Comfort Performance
  • Stable reliable temperature control 1?
  • Compressor frequency control 1Hz
  • Fan motors speed 15RPM
  • voltage range145VAC to 270VAC
  • running frequency range 30HZ to 100HZ
  • TECHNICAL SUPPORT
  • Dedicated Application Support
  • High performance C Compiler
  • Emulator/programmers
  • Application Notes
  • Reference SW

37
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
38
How to Start with 3-phase Compressor ?
  • ST7MTC2/xx Kanda kit (www.kanda.com)
  • 24V motor, control board, power board
  • PC SW, assembler SW
  • Aplication builder, programmer board
  • Advised Resale 695
  • ST7TMC2/PS high voltage power stage
    (www.kanda.com)
  • Spare 300V power board for high voltage
    applications
  • Emulator / Programmer
  • Application notes (www.st.com)
  • ST72141 related AN subjects basics of sensor
    less BLDC , ST72141 motor control cell, ST72141
    SW, PWM management, start-up algorithm, demo-kit
    operation,
  • AN numbers 1130, 1082, 1083, 1129, 1276,
    AIR-Condition controller, Specification ,user
    manual
  • Standard SW (contact ST)
  • Dedicated Refrigerator compressor design-aids
    (contact ST)
  • AN1238 REFRIGIRATOR 3-PHASE COMPRESSOR WITH
    ST72141
  • Standard Software to run 3-phase Compressors with
    4 or 6 pair of poles using the Kanda kit
  • ST Technical Support

39
Air-Condition or KANDA KIT MODE
DC24V BLDC Motor
KANDA KIT Mode
HV(DC300V) BOARD
Outdoor control board
INDOOR CONTROL BOARD
Air-Condition
ST72141-EPB
40
ST7MTC2 Motor Controller Kit
41
3 Phase Brush Less Motors
  • Electronically controlled, brushless motors with
    inverter are becoming increasingly popular.
  • They have significant advantages versus universal
    and single phase induction motors
  • INVERTER A three half-bridge configuration to go
    from single phase, fixed frequency mains to 3
    phase, variable frequency inverted current
  • INDUCTION motor or BLDC Motor ?

42
ST MICROELECTRONICS,YOUR ADVANTAGE FOR
  • LOWEST COST, HIGHLY RELIABLE, HIGH PERFORMANCE
    and DIGITAL CONTROLS
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Title:

ST72141 BLDC Inverter AirCondition Demo Kit

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Presentation Contents. A.Inverter Air-Condition Background. B. BLDC ... to real compressor with HV Board) 19. Air-Condition Demo Kit Control Unit. Indoor Unit: ... – PowerPoint PPT presentation

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Title: ST72141 BLDC Inverter AirCondition Demo Kit


1
ST72141 BLDC InverterAir-Condition Demo Kit
  • Feb 2004

2
ST72141 Air-Condition Demo Kit Presentation
Contents
  • A.Inverter Air-Condition Background
  • B. BLDC Motor Basics
  • C. ST72141 Air-Condition solution description
  • - whole Air-Condition Demo Kit
  • - Indoor unit
  • - outdoor unit
  • - Summary of Benefits of ST72141 solution
  • D. How to start with ST Air-Condition Demo Kit

3
Air-Condition system
  • Air-condition Compressor, 4 way valve, fan,
    evaporator, condenser
  • 4-way valve control cool or heat mode

Cool mode
Heat mode
4
Inverter Air-Condition Background (1)
  • Environment Friendly
  • Reduce waste of energy Variable Refrigerant Flow
    Air-Conditioners and Refrigerators provide energy
    saving of up to 40
  • The electricity demand increases faster than
    electricity supply Governments are implementing
    regulations to save on electric equipments
    efficiency
  • 95 of Japanese household use Inverter
  • air-conditioner
  • Enhanced Comfort Performance
  • Create friendly user interfaces
  • fine temperature regulation
  • Inspect whole Air-Condition system

5
Inverter Air-Condition Background (2)
  • Inverter Air-Condition Benefit
  • Lower electricity consumption
  • Fast get target temperature
  • Stable reliable temperature control
  • Silent operation

US
SEMI-CONDUCTOR DRIVE
ELECTRO-MECHANICAL DRIVE
VARIABLE FREQUENCY (3-phase Brushless DC
Compressor)
MCU DRIVER IGBT
15
FIXED FREQUENCY (Single phase Induction
Compressor)
4
BI-METAL THERMOSTAT
Efficiency
2
6
Inverter Air-Condition Background (3)
  • Inverter Air-Condition in China Market

7
Inverter Air-Condition Background (4)
  • 3Ph. Brushless Motors Explosive Growth

Source Forward Concepts 2000 and Motorola
Semiconductor Products
8
ST72141 Air-Condition Demo Kit Presentation
Contents
  • A.Inverter Air-Condition Background
  • B. BLDC Motor Basics
  • C. ST72141 Air-Condition solution description
  • - whole Air-Condition Demo Kit
  • - Indoor unit
  • - outdoor unit
  • - Summary of Benefits of ST72141 solution
  • D. How to start with ST Air-Condition Demo Kit

9
BLDC Motor Basics (Generalities)
  • Also called brushless Permanent Magnet DC (BLDC)
    or synchronous DC motor
  • Advantages
  • High efficiency (up to 98)
  • Variable speed
  • Silent operation
  • Reliable/long life time (no brushes)
  • High Size/Power ratio
  • High torque at start-up
  • Same stator as Induction 3 phase motor
  • Drawbacks
  • Overall system cost due to cost of electronic
    control

10
PMDC Basics (1)
  • Operating principle
  • Synchronous Stator flux and rotor mechanical
    rotation speed are same.
  • Stator description 3 phase winding (1 or 2 or
    more pairs of poles)
  • Rotor description Permanent magnet
  • For 1 pair of pole 1 electrical cycle (6 steps)
    1 mechanical cycle

11
One pair pole motor
12
PMDC Basics (2)
  • Drive mode 6 steps Principle

Current in winding A,B,C
300V DC
T1
T5
T3
A
U
V
B
W
C
2
T4
T6
T2
-
T1 T1 T3 T3 T5 T5 T4 T6 T6 T2 T2 T4
13
PMDC Basics (3)
  • Control Method
  • It requires to know the position of the rotor at
    all timesin order to reach the status of auto
    commutation (best efficiency). At least 2 common
    ways are available to know the rotor position.
  • Hall effect sensors (sensor mode)
  • Back emf (1) detection (sensorless mode)
  • The autocommutation happens when the current in a
    winding is in phase with the b-emf in this same
    winding.
  • The control process will be about keeping these
    2 signals in phase
  • Current generated by inverter in the motor
    windings
  • Back-emf Voltage induced (by Permanent Magnet) in
    the motor windings
  • (1) B-emf is the voltage induced in a winding by
    the movement of the magnet in from of this
    winding edj/dt. It is independant of
    the energy supply to the motor (just by spinning
    by hand the rotor for example it is
    possible to generate back-emf).

14
Implementation of control B-emf detection
Conventional Method (1)
300V
BUS
BUS
divider filter
N
N
5V
N
N'
N'
POWER GND
POWER GND
POWER GND
virtual ground
weaknesses - Voltage dividers give reduced
sensitivity difficulty for low speed operation
- Filtering is optimised for narrow speed
range
15
Implementation of control ST72141 patented
Sensorless method
300V
T1 PWM "ON"
A
V/2
B
C
bemf
T4 always ON
GND
  • back-EMF whole signal sensing
  • high sensitivity large speed range very
    low speed operation starting with full torque
  • no filtering delay
  • high signal to noise ratio

16
ST7141 Back-emf detection Patent
NO PATENT INFRINGMENT REDUCED COST
17
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
18
whole Air-Condition Demo Kit
  • Features
  • - Full Air-Condition Solution - Fuzzy Control
    Temperature
  • - 24V BLDC Motor (Extend - KANDA KIT
    Air-Condition mode
  • to real compressor with HV Board)

19
Air-Condition Demo Kit Control Unit
Indoor UNIT ST72324
Air-Condition Indoor Unit
  • Indoor Unit
  • - LED display
  • - Infrared remote controller signal
  • - 2 Temperature Sensor
  • - Fan PG motor
  • - Swing stepper motor
  • - Buzzer
  • - UART communication
  • Outdoor Unit
  • - 3 Temperature Sensor
  • - Current Voltage Sensor
  • - Compressor(BLDC motor)
  • - 4-way Valve
  • - Outdoor cooling Fan motor
  • - LED display
  • - UART communication

Display
Main Relay
Buzzer
Remote controller
PG Motor
Environment Temperature Sensor
Fan
Stepper Motor
Evaporator Temperature Sensor
Swing
SCI Communication
Environment Temperature Sensor
  • Outdoor UNIT
  • ST72141

Fan
Condenser Temperature Sensor
4-way valve
Compressor outlet Temperature Sensor
IGBT or IPM
Current Sensor
Voltage Sensor
BLDC Motor Compressor
Air-Condition Outdoor Unit
20
Air-con running mode and functions
  • Air-con running mode and functions

21
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
22
Low Cost High efficiency Digital Control
  • Features
  • 5 Mode Cool, Heat, Auto etc.
  • Full function sleep, Timer etc.
  • Infrared remote control
  • Fuzzy Temperature Regulation
  • Compressor Frequency display
  • Accurate Fan Motor control
  • C language
  • Main Components
  • MCU ST72324
  • Switch kit Triac,ULN2003
  • L7805?L7812
  • LED display, Buzzer, Relay, etc.
  • ST72324 Features
  • 8K to 32K Flash
  • PLL for 2x frequency multiplication
  • SCI SPI communication interface
  • 42/44 Pin, 32/24 multifunctional I/O
  • 10-bit ADC

23
Whole Air-Condition function
  • Indoor Unit Topology

24
Fan PG motor control Phase Angle Control
  • Fine control feature
  • Accurate Fan speed controlPI
  • Speed detection TimerINT
  • Zero crossing detection Timer INT

25
Communication SCI
  • Feature
  • Half-duplex Uart, Master/Slave
  • 1K baud rate
  • 8 data bits,1 start bit ,1 stop bit per byte
  • Communication Topology

26
Indoor Unit Application
27
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
28
The complete Kit for 3 Phase Motor drive
  • FEATURES
  • Variable Speed or test mode
  • Enhanced Digital Speed Regulation
  • Compressor protect (CUR , VOL, IPM etc.)
  • Auto-defrost
  • COMPONENTS
  • ST72141 MTC, 34pins, 8K OTP/ROM
  • Three L6368 power interface drivers
  • Six STGWNB60 IGBTs power drive
  • Viper12 non isolated supply

INVERTER
Bridge Rectifier
L638X
L638X
L638X
STBR408 STBR608
L6386
STGW20NB60HD
LED
4Way valve
Cooling Fan
Sensors
29
ST72141 Summary
  • ST72141 Feature Set
  • 8K ROM/OTP/EPROM
  • 14 multi functional bidirectional I/Os with
    external interrupt
  • Two 16-bit Timers with
  • 2 input captures 2 output compares External
    clock input PWM and pulse generator mode
  • SPI synchronous serial interface
  • 8-bit ADC with 8 channels
  • SDIP32 or SO34 package
  • Enhanced reset (on-chip) system
  • Low voltage supervisor
  • 3 power saving modes
  • Configurable watchdog reset
  • Motor Control Cell
  • Commutation step control Voltage mode /
    Current mode
  • Sensor or Sensor-less motor phase commutation
  • Back-EMF zero-crossing detection (as low as
    200mV)
  • Real time motor winding demagnetization detection
    for fine-tuning the phase voltage masking time to
    be applied before back-EMF monitoring
  • Automatic and programmable delay between back-EMF
    zero crossing detection and motor phase
    commutation

30
Outdoor Unit Application
BLDC Motor Speed Control (PI)
Init Main loop
LED, Fan 4way valve Relay etc.
Communication Set send Data Receive data decode
Err detection etc.
VOL, CUR Protection etc
Set target speed
ADC
C,D event Handle
Ports
PWM Duty cycle
BEMF Detection
Timer and INT
31
Sensorless starting procedure
  • 1/ Define a rotor starting position
  • ex phase A is grounded, starting current is
    risen into phase BC simultaneously
  • 2/ Define a constant acceleration starting ramp
  • First step-time and acceleration are depending on
    system inertia motor torque (see example here
    below)
  • 3/ Start by positioning the rotor (typically few
    100msec), then increase the current (torque) and
    sequence phase configuration according to
    step-time ramp enable b-emf detection from
    beginning, wait for two successive detection
    before to swap to auto-commutated mode

32
Control Principles of PMDC Maximum efficiency
with delay manager
33
ST72141 Regulation loops(simplified diagram)
Target Motor Speed
Step Time
Motor
P.I.D or Fuzzy regulation
b. emf
I
Feedback Speed
Motor efficiency regulation loop
Speed regulation loop
34
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
35
Benefits of ST72141 solution(1)
  • Patented Sensor Less back-EMF Control method
  • Only 3 standard resistors as external components
    for back-emf sensing
  • Embedded current loop and reset circuit
    minimises external components
  • Suitable for motors from 12V to 300V
  • Allows Voltage and Current mode control of Motors
  • Hardware Co-processor with an Industry standard
    8bit MCU
  • 8bit core accessibility, fast learning curve and
    time to market
  • Short and Low project development cost.
  • Low power consumption of MCU (15mA) allows for
    smaller supply than DSP
  • 8Mhz clock frequency generates lower EMI than DSP
    running at 20 or 40MHz
  • Internal HW 8bit multiplier and divider (70 of
    CPU resources free)
  • Allows running of your own BLDC in a few minutes
    with KANDA mode.

36
Benefits of ST72141 solution(2)
  • Cost Effective Appliances
  • Lower cost than available DSP offer
  • Dedicated Motor Control cell to free CPU
    resources
  • C language( indoor unit) .Short and Low project
    development cost.
  • User Friendly
  • Air-Condition status display Interfaces
  • Auto-defrost
  • Enhanced warning visuals
  • Extended Reliability
  • IGBT or IPM error detection
  • compressor over current protection
  • compressor over temperature protection
  • Enhanced Comfort Performance
  • Stable reliable temperature control 1?
  • Compressor frequency control 1Hz
  • Fan motors speed 15RPM
  • voltage range145VAC to 270VAC
  • running frequency range 30HZ to 100HZ
  • TECHNICAL SUPPORT
  • Dedicated Application Support
  • High performance C Compiler
  • Emulator/programmers
  • Application Notes
  • Reference SW

37
ST72141 Air-Condition Demo Kit Presentation
Contents
A.Inverter Air-Condition Background B. BLDC Motor
Basics C. ST72141 Air-Condition solution
description - whole Air-Condition Demo Kit -
Indoor unit - outdoor unit - Summary of
Benefits of ST72141 solution D. How to start with
ST Air-Condition Demo Kit
38
How to Start with 3-phase Compressor ?
  • ST7MTC2/xx Kanda kit (www.kanda.com)
  • 24V motor, control board, power board
  • PC SW, assembler SW
  • Aplication builder, programmer board
  • Advised Resale 695
  • ST7TMC2/PS high voltage power stage
    (www.kanda.com)
  • Spare 300V power board for high voltage
    applications
  • Emulator / Programmer
  • Application notes (www.st.com)
  • ST72141 related AN subjects basics of sensor
    less BLDC , ST72141 motor control cell, ST72141
    SW, PWM management, start-up algorithm, demo-kit
    operation,
  • AN numbers 1130, 1082, 1083, 1129, 1276,
    AIR-Condition controller, Specification ,user
    manual
  • Standard SW (contact ST)
  • Dedicated Refrigerator compressor design-aids
    (contact ST)
  • AN1238 REFRIGIRATOR 3-PHASE COMPRESSOR WITH
    ST72141
  • Standard Software to run 3-phase Compressors with
    4 or 6 pair of poles using the Kanda kit
  • ST Technical Support

39
Air-Condition or KANDA KIT MODE
DC24V BLDC Motor
KANDA KIT Mode
HV(DC300V) BOARD
Outdoor control board
INDOOR CONTROL BOARD
Air-Condition
ST72141-EPB
40
ST7MTC2 Motor Controller Kit
41
3 Phase Brush Less Motors
  • Electronically controlled, brushless motors with
    inverter are becoming increasingly popular.
  • They have significant advantages versus universal
    and single phase induction motors
  • INVERTER A three half-bridge configuration to go
    from single phase, fixed frequency mains to 3
    phase, variable frequency inverted current
  • INDUCTION motor or BLDC Motor ?

42
ST MICROELECTRONICS,YOUR ADVANTAGE FOR
  • LOWEST COST, HIGHLY RELIABLE, HIGH PERFORMANCE
    and DIGITAL CONTROLS
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