Transcript Power PSoC 101

Power PSoC 101:
Intro to Power Converters
Course Outline
Section 1:
Power Converter Overview
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:
Define the functional requirements for a power converter
Identify power converter variants and their constituents
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
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Voltage regulation
Efficiency
Noise, Distortion, Power Factor
Communications interface
Size
Safety
Protection
2
Power Converter Circuit Elements
Power Converter Circuit Elements
Power Converter Components
Semiconductor Switch
• Unidirectional
• Bidirectional
Power Converter Components
Power Converter Components
Inductor
• Lossless reactive circuit element
• Stores energy in its magnetic field
• Instantaneous voltage proportional to rate of change of current
vL (t )
 Steady state average voltage across the inductor equals zero.
Ts
1
vL (t )dt  vL  0

Ts 0
Power Converter Components
Capacitor
• Lossless reactive circuit element
• Stores energy in its dielectric field
• Instantaneous current proportional to rate of change of voltage
iC (t )
• Steady state average current through the capacitor equals zero.
Ts
1
iC (t )dt  iC  0

Ts 0
3
Operating Principle
Operating Principle
Operating Principle
Vo 
Ton xVi
 DVi
Tsw
D  DutyCycle
4
Converter Topologies
Power Converter Topologies
Buck: Vo <= Vi
Boost: Vo >= Vi
Buck-boost: Vo <=> -Vi
5
Converter Transfer Functions
•Converter Transfer Functions
Steady State Transfer Function - Buck
Vo = D.Vi
Steady State Transfer Function - Boost
Vo = Vi/(1-D)
Steady State Transfer Function – Buck-Boost
Vo = -D.Vi/(1-D)
6
Control Techniques
•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
• On-Demand Training
NOW
• Hands-On Workshops
• Webinars
www.cypress.com/training
• Learn More about PSoC hardware
design tools and PSoC-based solutions
at www.cypress.com/psoc
Support
Technical Resources
www.cypress.com/support
Online Support
CYPros
www.cypress.com/designresources
Phone Hotline, (425) 787-4814
Technical Reference Manual
Datasheets/Application Notes
Reference Designs