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Power Delivery

Training Center Classroom

Welcome this installment of EE Classroom on Power Delivery

The days of "throwing" over the cube what you think is a fully designed device and asking the power guy to juice it up, are long gone. Power is not a thing any more; it's the thing which is why how you are delivering power is an integral factor in your design. 

From the ultra-high energy efficiency, high power density, and redundancy required in increasingly demanding telecommunication applications to the battery management challenges of the HEV and EVs on- and off-board chargers, managing power has become an even more sophisticated and technically challenging technique. 

This classroom (yes, so easily audited) is your entre into topics around power delivery — delivered in tutorials, reference designs, and some back-to-basics, and short-form articles. Get your transistor head around high and low-side switching of MOSFETs and their drivers, as well as walk through an example of an ideal-diode MOSFET circuit. In the classroom FAQs, you can find some answers to your questions about flyback converters and that ratio between "real" power and "apparent" power of an electrical system known as Power Factor Correction. Walk-through the two very different types of equipment necessary for assessing battery chemistries — battery analyzer and testers. Finally, get a jump start on your project with reference designs that do some of the work for you so you can take off with your differentiated and innovative product. 

Aimee Kalnoskas

Editor in Chief, EE World Online

Power Delivery

Battery Management   •   MOSFETS

Standard amplifier functions in HEV/EV BMS

Batteries, battery analzyers, and battery testers

An ideal-diode MOSFET circuit

What are MOSFET drivers
& why do we need them?

The flexibility and cost-benefit of amplifiers are often overlooked in the BMS of HEVs/EVs. This article will focus on the BMS and how a designer may use amplifiers in the system.

Though the terms battery testers and battery analzyer are sometimes used interchangeably, they generally refer to two different types of equipment.

There are a lot of MOSFET drivers around these days. MOSFET drivers often contain MOSFETs themselves and there are several reasons for needing MOSFET drivers.

A circuit that uses inexpensive components consisting of a P-MOSFET (for use in the positive rail) with a dual PNP transistor and two resistors.

Power Delivery

Flyback Converters    •    Power Factor Correction

Basic principles of flyback converters

Enchancement and ICs for flyback converters

What is power factor and Power Factor Correction?

Methods to implementing PFC

Issues which affect flyback performance and what can be done to improve it, as well as IC controllers which make design and implementation of a flyback converter much easier.

An overview of the flyback design and some distinct advantages along with unique idiosyncrasies.

A look at power factor and the issues associated with power factors which are not unity.

Approaches to PFC including where the PFC function is physically implemented and how it can be implemented.

MOSFET Switching    •    Battery Protection    •    Pulse Width Modulation

High and low side
switching of MOSFETs

Reverse battery protection circuit

Speed control using PWM

In this project, speed control is attained using a PWM technique and PWM generation is done using an MCU.

Important concepts around high and low side Switching of MOSFETs, the need for Gate Driver circuit and driving methods of high side MOSFETs.

This tutorial will present a reverse battery protection circuit designed and tested for power efficiency with different loads.

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