Texas Instruments C2000 Piccolo LaunchPad Installation guide

C2000 Digital Power Supply

Workshop

Texas Instruments

Technical Training

D SP

TEXAS INSTRUMENTS

TECHNOLOGY

Introduction to Digital Power Supply Design

What is a Digital Power Supply?

Why use Digital Control

Techniques?

Peripherals used for Digital Power

Supply Design

Development Tools and Software

What is Digital Power?

Generic Power System Block Diagram

The controller block is what differentiates between a digital

power system and a conventional analog power system

Switches

(FETs)

Network

Controller

(Compensator)

Vout

PWM

Vin

Why Digital Control Techniques?

Controller

Analog

Digital ??

PWM

Sensor(s)

Bandwidth limitations (sampling loop)

PWM frequency and resolution limits

Numerical problems (quantization, rounding,…)

AD / DA boundary (resolution, speed, cost)

CPU performance limitations

Bias supplies, interface requirements

Component drift and aging / unstable

Component tolerances

Hardwired / not flexible

Limited to classical control theory only

Large parts count for complex systems

Insensitive to environment (temp, drift,…)

High reliability

S/w programmable / flexible solution

Precise / predictable behavior

Advanced control possible (non-linear, multi-variable)

Can perform multiple loops and “other” functions

High bandwidth

High resolution

Easy to understand / use

Historically lower cost

Digital ControllerAnalog Controller

Power Elec.

Benefits of Digital Control

Eliminate Components

PFC

Filter

Bridge V

VDC/DC

Aux P/S

Output

Multiple chips for

control

Micro-controller for

supervisory

Dedicated design

Traditional Analog

Power Supply

VPFC

Filter

Bridge V

Aux P/S

DC/DC

Converter

Control

Multi-mode

Power control

MCU Supervisory

ousekeeping

Circuits

Current/Load

Sharing

Control

DC/DC V

To ost

PFC Control

Interface

Circuit

Monitor

(MCU?)

Inrush/

ot-plug

Control

IIIIOutput

PFC Control

Interface

Circuit

Monitor

(MCU)

Inrush/

ot-plug

Control

DC/DC

Converter

Control

Multi-mode

Power control

MCU Supervisory

ousekeeping

Circuits

Current/Load

Sharing

Control

Reduce Manufacturing Cost

Variable DC Output

Better Performance Across Corners

Failure Prediction

One Device, Multiple DC Outputs

One Design, Multiple Supplies

Digital controller enables multi-threaded applications

Analog Control System













=sCR

sCR

)(

)()(

)()()(

tftyk

tdy

tyd

tyd =+++

Differential equations

1st , 2nd , 3rd ,…order

eed to find:

R1, R2, C1, C2

Laplace Transform

“Analog Computation”

Differential equations

Digital Control System

)()1()2(

)1()2()(

012

nEbnEbnEb

nUanUanU

⋅+−⋅+−⋅

−

⋅

−

⋅

)()()( nWnRnEwhere

−

)()(

)()()(

tftyk

tdy

tyd

tyd =+++

Differential equations

1st , 2nd , 3rd ,…order

Difference equation

eed to find:

a1, a2, b0, b1, b2

Laplace Transform

Z Transform

Time Sampled Systems

Processor Bandwidth

Sample Freq (=PWM) Sample Period

(kHz) (ns)

100 10000

300 3333

500 2000

700 1429

1000 1000

1500 667

2000 500

Time Division Multiplexing (TDM)

Control Code (C2)

Processor 2 ControlControl Code

y(n)

x(n)

Control Code (C1)

Processor 1 ControlControl Code

Control Code (C3)

Processor 3 ControlControl Code

Single CPU C1 C2 C3 C1 C2 C3 C1 C2 C3

TSAMPLE

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