LAZAR's POWER ELECTRONICS GUIDE

SMPS SWITCHING POWER SUPPLY DESIGN BASICS:


CIRCUITS, SCHEMATICS, ELECTRICAL ENGINEERING REFERENCE, SOFTWARE AND OTHER INFO

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The electric energy is not normally used in the form in which it was produced or distributed. Practically all electronic systems require some form of energy conversion. A device that transfers electric energy from a given source to a given load using electronic circuits is referred to as power supply. Of course, it does not really supply power, it just converts it, so "converter" is a more accurate term for such a device.

A typical application of a DC power supply unit (PSU) is to convert utility AC voltage into a set of regulated DC voltages required for electronic equipment. The energy flow in a modern PSU is controlled with semiconductors, which can operate in different modes. Original PSUs were linear. Nowadays in most of them power semiconductors are continuously switching on and off with high frequency. Such units are referred to as switched mode power supplies or SMPS.

They offer greater efficiency compared with linear supplies because they can control energy flow with low losses: when a switch is on, it has low voltage drop and will pass any current imposed on it; when it is off, it blocks the flow of current. As the result, in such a switch the power dissipation which is the product of voltage and current, can be relatively low in both states. Switching mode units are also smaller in size and lighter in weight due to the reduced size of passive components and lower heat generation. The industry trend toward miniaturization, advancements in semiconductor technology, as well as various energy efficiency regulations have made "switcher" the dominant type of PSU across practically the full spectrum of applications. Most of the PSU manufactured today for AC input applications also include a PFC front end.

In general, SMPS converters can be classified into four types according to the form of input and output voltages: AC to DC (also called off-line DC power supply), DC to DC (voltage or current converter), AC to AC (frequency changer or cycloconverter), and DC to AC (inverter).

The field of engineering that deals with the design and analysis of power conversion circuits and devices is called power electronics, although power supply design is a true cross-disciplinary task. It involves the circuit, magnetics, thermal management, control and compliance issues. This site is SMPS/power electronics information guide. Here you will find a tutorial, tools, reviews, schematics, and other free online resources on all aspects of switching power supply design and selection, information on other energy conversion devices, as well as basic electrical engineering reference and electronic formulas.




POWER ELECTRONICS / SMPS DESIGN- THEORY & TUTORIALS
TI (Unitrode) seminar books online

Power supply design tutorial - basic concepts and operation

Glossary of energy conversion and power electronics technology terms



FREE SIMULATION SOFTWARE AND CALCULATORS
Find open source circuit simulation programs, working demos of analog and mixed-signal simulators, and other engineering software & calculators

Quick online quiz- how well do you know power supply safety



PSU TOPOLOGIES: APPLICATION NOTES, GUIDES, SCHEMATICS
Switching mode converter topology selection

A review of standard computer PSU connectors and pinouts

The basics of switched mode regulators, design guides, SMPS circuit diagrams, and other design resources

PCB DESIGN OF ELECTRONIC
CIRCUITS
Layout guidelines for printed circuit board;

Trace spacing for voltages;

Trace width calculator per IPC-2152;

Guidelines, free software, and other resources for circuit board designers.

TRANSFORMER AND INDUCTOR- THEORY & CALCULATIONS
Magnetic unit conversion: table, formulas and calculator;

Power transformer and inductor design: formulas, software, and other tools and guides.

BACKUP POWER DEVICES
Standby generators - reviews and comparison;

Solar power fundamentals;

UPS guide and review.

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