project ppt..pdf
TRANSCRIPT
Digital Signal Processor
Digital Signal Processor (DSP)– Similar to a Microprocessor(µP), e.g. core of a computing
system
– Additional Hardware Units to speed up computing of sophisticated mathematical operations:
• Additional Hardware Multiply Unit(s)
• Additional Pointer Arithmetic Unit(s)
• Additional Bus Systems for parallel access
• Additional Hardware Shifter for scaling and/or multiply/divide by 2n
Digital Signal Controller (DSC)
Digital Signal Controller (DSC)– recall: a Microcontroller(µC) is a single chip Microcomputer
with a Microprocessor(µP) as core unit.
– Now: a Digital Signal Controller(DSC) is a single chip Microcomputer with a Digital Signal Processor(DSP) as core unit.
– By combining the computing power of a DSP with memory and peripherals in one single device we derive the most effective solution for embedded real time control solutions that require lots of math operations.
– DSC –Example: Texas Instruments C2000 family.
C2000
C5000
C6000
Efficient Integration
for Control
DSC
Power Efficient
Performance
DSP
High Performance
‘C’ Efficiency
DSP
Texas Instruments DSP/DSC -
Portfolio
TMS320 –FamilyBranches
Different families and sub-families
exist to support different markets
Lowest Cost
Control Systems
Motor Control
Storage
Digital Ctrl Systems
C2000 C5000
Efficiency
Best MIPS per
Watt / Dollar / Size
Wireless phones
Internet audio players
Digital still cameras
Modems
Telephony
VoIP
C6000
Multi Channel and
Multi Function App's
Comm Infrastructure
Wireless Base-stations
DSL
Imaging
Multi-media Servers
Video
Performance &Best Ease-of-Use
DC Motors Features
Electrical sparks due to commutators
Produce significant EMI!
NOT suitable for deployment in combustible environments
Limited speed due to commutators
Mechanical noise due to commutators
Commutators limit life time
-
Internal commutation
Speed proportionate to voltage applied
Easy to control: ON/OFF, Proportional
Low Cost
+
DC motors control requirements
• Input
– Torque, speed, direction, position
• Control
– Simple PWM scheme, ON/OFF approach
• Feedback
– Encoder for speed or direction feedback
• Driver
– Low-side Switch (MOSFET) for uni-directional type
– H-Bridge for bi-directional type
DC Motor
s s
sETachometer sKsV t
tK
s
sV
sE ―Control Voltage
―Tachometer Measure (V)
―DC Motor Angular Speed
―Tachometer Constant
m
mK ―Motor Torque Constant
―Motor Time Constant
sEs
Ksm
m1
1
tm
m
m
m
K
sE
s
sK
sE
s
1
1
te MSpeed Reference
Speed Measure
(Tachometer)
+
-Speed
Controller
Control Voltage Motor
Speed
The DC Motor Control Loop
Speed Reference
+
-
Digital to Analog
Converter
Speed Control
ToMotor
Measured Speed (From Tachometer)
The Speed controller comprises two blocks •Speed Control:
•Digital to Analog converter:
The Speed Controller
DAC
PWM LPF
•Digital to Analog converter:
This block is implemented using a PWM signal generator and a Low Pass Filter
M
Speed Measure
(Tachometer)
Amplifier
DC Motor Kit
Stroboscope
RPM
TMS320F2812
LPF AmplifierPWM1
Voltmeter
Connecting the eZdsp to your PC
25 pin maleD-sub connector(Plugs into parallelport on PC)
25 Conductor Cable
25 pin maleD-sub connector
25 pin femaleD-sub connector
To wall outlet
PowerSupply
PowerConnector (P6)+5V
I/O Interface (P4/P8/P7)
TMS320F2812 - DSP ANALOGInterface (P5/P9)
Parallel Port/JTAGControllerInterface (P3)
JTAG Interface (P1) EXPANSIONData & Address (P2) SRAM
64K x 16
Broad C28x™ Application Base
Digital Power Supply
Provides control, sensing,
PFC, and other functions
Printer
Print head control
Paper path motor control
Evaluating Other Segments e.g.. Musical Instruments
Non-traditional
Motor Control
Many new cool
applications to
come
Optical Networking
Control of laser diode
tm
m
m
m
K
sE
s
sK
sE
s
1
1
te MSpeed Reference
Speed Measure
(Tachometer)
+
-Speed
Controller
Control Voltage Motor
Speed
The DC Motor Control Loop
MT150F
I/F Circuit
eZDSPF
M
Tacho
Servo Amplifier
SA150D
PWM1
ADCINA0
DC Motor Kit
Power Supply
PS 150E
RTDX
ADCINA0
Interface Circuit
TMS320F2812
M
Speed Measure
(Tachometer)
AmplifierPWM1
Attenuator
ADCINA0
LPF
DC Motor Kit
Amplifier
0-3 V
(Digital)
0-3 V
(Analog)
0 to 15 V (Analog)
-15 V to 0 (Analog)
Signal Types and Voltage Levels
LPF Amplifier Circuit
Inverting Amplifier with LPF
DC Motor
s s
sETachometer sKsV t
tK
s
sV
sE ―Control Voltage
―Tachometer Measure (V)
―DC Motor Angular Speed
―Tachometer Constant
m
mK ―Motor Torque Constant
―Motor Time Constant
sEs
Ksm
m1
1
DATA ACQUISITION CARD
NI LabviewProfessional
-1
0
1
2
3
4
5
6
7
0 0.5 1 1.5 2 2.5
Sp
ee
d
Time
Time Constant
Connecting the eZdsp to your PC
25 pin maleD-sub connector(Plugs into parallelport on PC)
25 Conductor Cable
25 pin maleD-sub connector
25 pin femaleD-sub connector
To wall outlet
PowerSupply
Fig. 8.4 Pulses for 10% & 25% Duty Ratio
Fig. 8.5 Pulses for 50% & 75% Duty Ratio
Presented by:
M.Pratyusha
G.Hema Manvi
Ch.Sravana Vindhya
Guidance:
Mr.M.Chakravarthy
Thank You