基于C2000的数字化电源方案

基于C2000的数字化电源方案

基于C2000的数字化电源方案

Yanming Luo/ Tan Hui/ Loyal Bao Texas InstrumentsTI Proprietary information

基于C2000的数字化电源方案

Agenda Introduction to Digital Power Supply What is DPS? Why DPS?

C2000 Digital Signal Controllers Roadmap Next Generation– Piccolo-A&B CLA and Peripherals

Digital Power with C2000 Application Architecture

Getting Started Hardware& Software Development Tools

TI Proprietary information

基于C2000的数字化电源方案

Power Supply System Level Challenges- Improved Efficiency Across the Load Range: 90% From 10% - 100% Load& Pushing For 96% Max Efficiency in AC/DC and DC/DC Systems

- Higher Integration, Lower System Cost w/ Improved Reliability& Density: Single Chip Control+ Housekeeping w/ Increased Integration of High Speed Analog (Comparators, V-regs, etc…) Use of Full Digital Control for More Advanced Fault Prediction Algorithms

- Added Intelligence such as Input Power and RMS Current Measurement/ Reporting: Better than 2% Accuracy of Input Power From 20% - 100% Load Goal is No Added External Components with Minimum Calibration Time

- Ease of Development/ Manufacturing Best in class development tools& collateral/ Expand our GUI Support to wider set of topologies Minimize calibration and test times for functions like input power measurement

- Flexibility& Differentiation: Support of Advanced Topologies Digital Power Solutions Will Enable MP Customers to More Easily Add Value to Their Customers

TI Proprietary information

基于C2000的数字化电源方案

Complete Power Solutions from TIUCCxxxxHigh Performance Analog Solutions

UCD30xxPower-Optimized Digital Controllers

F28xxxFully Programmable Digital Controllers

PFC Analog PFC Controllers UCD30xx PFC Control F28xxx PFC Control Gate Drive& Bias

Iso. DC/DC Stage Analog Controllers UCD30xx Controllers F28xxx Controllers Gate Drive& Bias

TI Solutions Cover the Spectrum of Power ApplicationsTI Proprietary information

EMI Filter

基于C2000的数字化电源方案

Analog& Digital Voltage Regulators - A exampleL1 L2 Vg RL1 RL2 i1 i2 RESR+ VC– C ...c1 Compensator PWM d(t)–+– Vramp 1– Vramp 2 Vref Monitor ADC Processing Unit Memory Communication Set/Measure, report Voltage, Temperature, Current, faults… e(t) Digital PWM d[n] Compensator e[n] GC (z) Error ADC e(t) c2 Vout Vg L1 L2 RL1 RL2 i1 i2 RESR+ VC– C Vsense Vout

+–

R

+–

R

Σ

–

Vref+ DAC

+

+

Analog Controller

Digital Controller

"Digital Control" means sampling feedback information using ADC and closing the loop numerically Compensator uses digital signal processing techniques to construct the control effort in form of PWM duty rario(s)

Enables‘inherent’ monitoring and management of the converter(s)

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基于C2000的数字化电源方案

Digitally Controlled Power Converter - Conceptual Block DiagramΔVcΔVc– output control accuracy

Power Converter Vin CΔVs+

RLVref _ adc= Vo max Kd

ΔD– PWM duty cycle resolution

ΔD

Δ

Vs

Kd ADC

Digital Controller

PWM U(n) Gc(z) E(n) Vr

U ( z ) B0+ B1 z 1+ B 2 z 2 Gc ( z )== E (z) 1 A1 z 1 A2 z 2

ΔVs– sensing accuracy ADC resolution

U (n)= B0 E (n)+ B1 E (n 1)+ B2 E (n 2)+ A1U (n 1)+ A2U (n 2)

TI Proprietary information

基于C2000的数字化电源方案

Compensator RealizationsNumerator Denominator d[n] K0N ... K01 K00 e[n] z–1 K1N ... K11 K10e[n-1]

2nd-order table look-up (UCD9112)d ( z ) K 0+ K1 z 1+ K 2 z 2= 1 z 1 e( z )

K2N ... K21 K20 z–1 e[n2]–

d[n1]–

z–1

Direct-form digital filter (UCD9240)Numerator Denominator d[n]

d ( z ) b0+ b1 z+ b2 z= e ( z ) 1 a1 z 1 a 2 z 2

1

2

a1 e[n] b0 z–1 e[n– 1] b1 z–1 e[n– 2] b2 z–1

d[n– 1] z–1

a2 d[n– 2]

PID-form digital filter (conceptual)KP e[n] Kl d[n] P d[n] l KD z–1 z–1 d[n] D Derivative e[n– 1]α z–1 d[n] Proportional

d (z) 1 1 z 1= KP+ KI+ KD e( z) 1 z 1 1 αz 1

Integral

=

(K P+ K I+ K D ) (K P (1+α )+ K Iα+ 2 K D )z 1 (1+α )z 1+αz 2

1

+ ( K Pα+ K D )z

2

TI Proprietary information

基于C2000的数字化电源方案

Analog vs. Digital Solution TradeoffsStrengths Continuous operation (infinite sample rate) Low power consumption Single chip solutions available (integrated driver)

WeaknessesHardwired design Separate“signal” lines for every converter No communication with controllers Need separate system manager

ANALOG DIGITAL

GUI, programmable parameters Adaptive and nonlinear compensation Flexibility, easier board development Features integration Multiphase reliability

Discrete PWM operation Higher quiescent current Dual chip solution (controller+ driver) even for low power apps

Phase shedding N+1 redundancy Easier PWM synchronization Fault logging Up to 32 devices on single PMBus

TI Proprietary information

基于C2000的数字化电源方案

Digital Power: Greener Approach that Saves MoneyVI

Filter BridgeInrush/ Hot-plug Control

V

PFC

VI

DC/DC8 5 4 1

V

I

V

I

Output

PFC Control

DC/DC Current/Load DC/DC Current/Load Converter Sharing Converter Sharing Control Control Control Control Multi-mode Multi-mode Power control Power control

Traditional Analog Power SupplyMultiple chips for control Micro-controller for supervisory Dedicated design

Interface Circuit Monitor(MCU?)

MCU MCU Aux P/S

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