PID Control Customer Presentation PR080200-0004 August 2002 - page 1

Anadigm® FPAA Solutions forAnadigm® FPAA Solutions forPID ControlPID Control

Customer PresentationAugust 2002

PID Control Customer Presentation PR080200-0004 August 2002 - page 2

PID Control PID Control -- AgendaAgenda

Basics of PID ControlImplementing PID Controller using Anadigm® FPAAThe Anadigm® Advantage

PID Control Customer Presentation PR080200-0004 August 2002 - page 3

Typical Closed Feedback Control LoopTypical Closed Feedback Control Loop

PLANT

LOOP CONTROLLER

Output Control

Measurement

Error Signal

Setpoint

Signal Conditioning

Sensor

PID Control Customer Presentation PR080200-0004 August 2002 - page 4

Basic Interactive PID Controller FunctionBasic Interactive PID Controller Function

LOOP CONTROLLER

Error Output

Proportional

Integral

SUMe = error signal

Derivative

++= ∫ dt

deDdteIePOutput .

Where P = gain, I = integral or Reset and D = Derivative or Rate

PID Control Customer Presentation PR080200-0004 August 2002 - page 5

Basics of PIDBasics of PID

Most industrial controllers are some form of PID controllersP ProportionalI IntegralD Derivative

PID ControllerP Applies GAIN to the error signalI Applies integration (or RESET) to the error signalD Applies differentiation (or RATE) to the error signal

The PID ControllerP,I,D Parameters are set according to system characteristics and the response characteristics desiredWorks to reduce the error signal to zero

PID Control Customer Presentation PR080200-0004 August 2002 - page 6

Implementing PID Control Implementing PID Control –– Using FPAAUsing FPAA

Temperature control (industrial oven) with the Anadigm® FPAA

An example of a P (Proportional ONLY) controller

Fluid tank level control with the Anadigm® FPAAAn example of a PI (Proportional-Integral) controller

Implementing ‘dynamic’ backup control using the AN220E04

An example utilizing the reconfiguration capability of the Anadigm® FPAA solution

PID Control Customer Presentation PR080200-0004 August 2002 - page 7

Temperature Control (Industrial Oven)Temperature Control (Industrial Oven)

INDUSTRIAL OVEN

Thermister/RTD

ON-OFF Heat Source AN220E04

Setpoint

Temperature Set Point

Erro

r

Proportional

CONTROLLER

Ampl

ifica

tion

Sign

al L

inea

rizer

AN220E04

CONTROL OUTPUT

Measurement

PID Control Customer Presentation PR080200-0004 August 2002 - page 8

Implementing Temperature ControlImplementing Temperature Control

Thermistor/RTD Output

Scales the voltage: –3V to +3V

Input Chopper Amplifier

Sum-Diff CAM

Scales up the small thermocouple voltage

Transfer Function CAM

Linearizes the voltage

Setpoint

Temperature Set Point

Sum-Diff CAM

Gain Half CAM

Comparator CAMC

ontro

l Out

put

Generates the error voltage

Acts as a proportional controller

Hysteresis comparator prevents theheat source from continuallyflip-flopping on and off

AN220E04

measurement

PID Control Customer Presentation PR080200-0004 August 2002 - page 9

Implementing Temperature ControlImplementing Temperature Control

SP

Error

Control Output

Input Chopper Amp

Signal conditioning & linearization

Proportional Controller Gain Stage

Hysterisis Comparator

Sensor Input

Setpoint

Measurement

PID Control Customer Presentation PR080200-0004 August 2002 - page 10

Simulated Oven Controller OutputSimulated Oven Controller Output

Graph of Oven Output Controlled by AN220E04 (simulated)

0

50

100

150

200

250

300

0 20 40 60 80 100 120

Time (minutes)

Deg

rees

(F)

Oven TemperatureDesired TemperatureSet

After reaching 250 degrees the oven over shoots to the top end of its

range of +- 18 degrees. This range can be changed by changing the gain

of the half cycle gain stage

PID Control Customer Presentation PR080200-0004 August 2002 - page 11

Fluid Tank Level ControlFluid Tank Level Control

AN220E04

AN220E04

Measurement

Set Point

Erro

r

Proportional

Integral SUM

Filler Valve

Level Sensor

Level Control Dial

INTE

RFA

CE

CIR

CU

IT

PLANT

Output Control

PID Control Customer Presentation PR080200-0004 August 2002 - page 12

Implementing Fluid Tank Level ControlImplementing Fluid Tank Level Control

Sum-Diff CAM (Proportional Error

Signal)

Integrator CAM

Sample/Hold CAM

Sum-Diff CAM

PID Control Customer Presentation PR080200-0004 August 2002 - page 13

‘‘Dynamic’ Backup Control SystemDynamic’ Backup Control System

Advanced control

computer

Transmitter/instrument interface with

AN220E04 chip

Wireless cell phone connection

Instrumentation dataCONTROL SIGNAL

Process

PID Control Customer Presentation PR080200-0004 August 2002 - page 14

‘‘Dynamic’ Backup Control SystemDynamic’ Backup Control System

Advanced control

computer

Transmitter/instrument interface with

AN220E04 chip

Wireless cell phone connection

PI Control

Process

PID Control Customer Presentation PR080200-0004 August 2002 - page 15

The Anadigm® AdvantageThe Anadigm® Advantage

Software Design EnvironmentIntuitive, easy-to-useRapid prototype and test

Anadigm® FPAA PlatformAdaptive silicon characteristics allows for the tuning of the control system characteristics – even in real timeAllows for more precise control since the entire control system is implemented within a temperature compensated, drift-free analog silicon platformAddresses high-speed, real-time closed loop control systems since the signal processing is entirely in the analog domain

Dynamic ReconfigurationAllows for innovative approach to control system designAdjust the control system parameters ‘on-the-fly’ to maintain system operation despite environmental changes, component aging and disruptive events