Power PSoC 101: Intro to Power Converters

Section 1: Power Converter Overview

Course Outline

Section 2: Power Converter Circuit Elements

Section 3: Operating Principle

Section 4: Converter Topologies

Section 5: Converter Transfer Functions

Section 6: Control Techniques

Course Objectives

At the end of this course, you should be able to:

Identify power converter variants and their constituents

Define the functional requirements for a power converter

Explain the principle of operation of power converters

List basic topologies and their transfer functions

Explain the concept of commonly used control techniques

1 Power Converter Overview

What is Power Converter?

A power converter is an electronic circuit that processes power in its available form and converts it to the required voltage/power levels that the devices specifically demand

Common Converter Characteristics

• Voltage regulation• Efficiency• Noise, Distortion, Power Factor• Communications interface• Size• Safety• Protection

Power Converter Circuit Elements

2 Power Converter Circuit Elements

Power Converter Components

Semiconductor Switch

• Unidirectional

• Bidirectional

Power Converter Components

Inductor

• Lossless reactive circuit element• Stores energy in its magnetic field• Instantaneous voltage proportional to rate of change of current

Power Converter Components

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0)(1

0

L

T

Ls

vdttvT

s

Steady state average voltage across the inductor equals zero.

Power Converter Components

Capacitor

• Lossless reactive circuit element• Stores energy in its dielectric field• Instantaneous current proportional to rate of change of voltage

• Steady state average current through the capacitor equals zero.

)(tiC

0)(1

0

C

T

Cs

idttiT

s

Operating Principle

3 Operating Principle

Operating Principle

DutyCycleD

DVT

xVTV i

sw

iono

4 Converter Topologies

Power Converter Topologies

Buck: Vo <= Vi

Boost: Vo >= Vi

Buck-boost: Vo <=> -Vi

•Converter Transfer Functions

5 Converter Transfer Functions

Vo = D.Vi

Steady State Transfer Function - Buck

Steady State Transfer Function - Boost

Vo = Vi/(1-D)

Vo = -D.Vi/(1-D)

Steady State Transfer Function – Buck-Boost

•Control Techniques

6 Control Techniques

Control Techniques – Voltage Mode

Control Techniques – Peak Current Mode

Course Summary

Overview to power converters and its common characteristics

basic circuit elements used in a power converter

operating principle of converters

3 basic topologies the buck, boost and buck-boost

state transfer functions for the basic converter types

Peak Current and voltage mode techniques

Next Steps

Supportwww.cypress.com/supportOnline SupportCYPros

Phone Hotline, (425) 787-4814

Technical Resources www.cypress.com/designresourcesTechnical Reference ManualDatasheets/Application Notes Reference Designs

• On-Demand Training

• Hands-On Workshops

• Webinars

• Learn More about PSoC hardware design tools and PSoC-based solutions at www.cypress.com/psoc

www.cypress.com/training

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