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The easier and faster way

to design the control of

your power converter

smartctrl®

Juan Pablo RodriguezSmartCtrl Development Manager

Table of contents

SmartCtrl: Control Design for Power Electronics 2

- Introduction: What SmartCtrl is

- Features

- Capabilities

- Application Examples: PSIM & SmartCtrl

• PFC Boost Converter

• Resonant Converter

• Single Phase Inverter


What SmartCtrl is


What SmartCtrl is

After over 20 years of experience in the field of power electronics systems SmartCtrl software is beingdeveloped as a platform in which, a part of our knowledge related to control in power electronic systems, iscollected.

SmartCtrl

SmartCtrl is a general-purpose controller design software specifically for power electronics application. Itfeatures:

- a friendly interface- simple workflow- easy to understand display of control loop stability and performance.

Using SmartCtrl, one can design controllers of various power converters easily and very quickly.

SmartCtrl Pro

SmartCtrl Pro adds the digital controller design option to SmartCtrl:

- One can design a controller in the analog s-domain, define digital delay, and check the control loopstability

- SmartCtrl Pro allows to calculate the z-domain coefficients of digital compensators to be implementedon digital devices

It is a good practice to compare the discretized compensator with the original analog one.


Features


From the specs to the Design

Control Designs from SpecsStarting from a specification, design quickly and visually the best control for yourconverter and get the results for an analog or digital control

Topology will be provided automatically according to specifications; it will be possible to choose manually a specific one as well


Real Time Updated

Data is Real Time UpdatedInteractive plots allow you to choose the best control design whereas that waveforms, bodes,nyquist and all output data are updated in real time


Multi-loop Control Structures

Multiloop Control StructuresAverage-Current Mode Control and Peak-Current Mode Control are supported in SmartCtrl:

Average – current control

- Inner and outer compensator design

Peak – current mode control

- Compensating ramp design- High frequency effects


Solutions Map

Solutions MapThe Solutions Map helps the user to choose the crossover frequency and the phasemargin. SmartCtrl presents a stable solutions space for every type of regulator


Waveforms of the Stead-state

Steady-state Waveforms are Plotted

Inductor current and voltage ripple are plotted

The modulating signal output ripple is also plotted


PSIM Integration

Electronic Circuit Simulator IntegrationSimulate the final design with a single click

SmartCtrl automatically generates aready-to-simulate schematic, containingthe complete circuit, including the powerstage and the control circuit.With just one click on the PSIM’s icon,one can export the entire circuit andsimulate it.


Capabilities


Import Frequency

Import Frequency ResponseGet the frequency response of your power converter from a simulator or frequencyanalyzer, import it to SmartCtrl and design your control.


Import Transfer functions

Import transfer functionsIf you want to check your theoretical model or view the effects producedby modifying certain parameters of your converter or control, you can import transferfunctions.


Export Transfer funcionts

Export Transfer FunctionsRight clicking on any of the sub-screens, you can export the information you need: transfer functions, waveforms and transient responses.


Audio-susceptibility and input-outpus impedances

Audio-susceptibility and input-output impedancesFor every DC-DC converter and control type, the transfer functions (TF), output voltage to input voltage (Audio-susceptibility) and output voltage to output current (output impedance) are shown as additional Bode Plots.


Sensibility Analysis

Sensibility AnalysisWith Parametric Sweep you can perform a sensitivity analysis on every parameter of the plant, sensor and regulator. Observe how this changes affect the system. Data is real time updated.

- Input and output voltages- Converter inductance, filter capacitor, cap ESR, etc.- Output power- Switching frequency- Sensor gain and bandwidth- Regulator resistors and capacitors


Digital Control

Get the Digital ControlThe key features of the Digital Control module are the following:

- Digital effects (DEFs) such as sampling frequency, DPWM delays, and rounding effects dueto the limited bits number of compensator coefficients are considered.

- New Bode plots considering DEFs are shown.- Sensitivity analysis of DEFs can be performed.- The designed digital compensator can be exported to PSIM in z-domain format.


DC-DC Converters

Topologies and Control ModesIn SmartCtrl you can design the control for a generic converter or use a predefined topology.

The predifined topologies are:

- Forward converter- Flyback converter- Buck converter- Boost converter- Buck-boost converter

For each predefined topologyor generic converter you can choose the following controls:

- Voltage mode control- Average current mode control- Peak current mode control


PFC Boost Converters

Power Factor Correction toolSmartCtrl has a PFC design tool (Power Factor Correction – Boost Converter). Thistool incorporates an UC3854A controller as well as some other practical information, like theactual values of output voltage when a single pole regulator is used as outer loopcompensator.


Equations Editor

The Equations EditorThis built-in function supports the definition of customized plants and sensors transferfunctions, through the “design a generic plant” and “design a generic control system” options.

Design the plant of your power converter anywhere in s-domain and use SmartCtrl to designits control


Application Examples


PFC Boost Converter


PFC Boost Converter

Boost PFC Converter Control Loops designIn this example it will be designed, step by step, the control loops of a PFC (power factor correction) boostconverter, from SmartCtrl to obtain a complete PSIM’s schematic

Inner Loop (Current Loop)

Outer Loop (Voltage Loop)


PFC Boost Converter

PFC Boost specificationsIn SmartCtrl it is possible to design two types of Boot PFC:

- Constant Power Load (CPL): as a DC-DC Converter- Resistive Load

and its control could be based on:

- generic multiplier- UC3854A multiplier

The PFC Boost specs in this example will be:


PFC Boost Converter

SmartCtrl Compensator TypesFor the design of the current loop, the plant is calculated as a DC/DC converter for a certain operatingpoint, that is specified in the line angle wta(º).

Magnitude plot


PFC Boost Converter

Outer compensator selectionIn case of a single pole compensator, the output voltage in the error amplifier is in phase with the input voltage; this means that harmonic distortion will be lower than in case of a PI compensator.

Single pole compensator PI compensator


PFC Boost Converter

Fast Fourier Transform of the Line CurrentBy clicking with the right button on the line current panel the FFT could be obtained, which displays a new window with a plot that provides information regarding the harmonic distortion.


Resonant Converter


Resonat Converter

Resonant Converter Control Loop DesignOne of the main purposes of this example is to illustrate that the resonant converter can be representedby the imported AC sweep results from PSIM, and the control loop of the resonant converter can bedesigned using SmartCtrl.

1. Perform AC analysis in PSIM


Resonat Converter

Switching FrequencyTo find out the Fsw of the resonant convert it has been simulated in open loop mode (PSIM simulation).Output voltage is shown below:

Fsw ≈ 124 KHz (T ≈ 8u)


Single Phase Inverter




L

Load

+

-

vO

iO

iC

iL

C

PWM modulator

vcon

vDCm

tsinRV

vO

+

VO ref p

-

IL ref

vO ref

vO med

iL avg

+

VDC

-

iDC

iL

vO m

+

-

vinv

Voltage sensor

Current sensor

Inner Current

Loop

Voltage sensor


Thank you very much for your attention

Korea June 2015

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