Introduction to Power Electronics and Modules by Prof. DC Hopkins, © 2002 Your Marketing Group at Celestica Power www. celestica. com / power A collaborative presentation by Professor Doug Hopkins at State University of New York www. dchopkins. com AN INTRODUCTION TO POWER ELECTRONICS AND MODULES

Introduction to Power Electronics and Modules by Prof. DC Hopkins, © 2002 Welcome and Outline An Introduction to Power Electronics and Modules An Introduction to The System Power Processing Power Processing - Conversion Power Processing - Supply Power Processing - Linear or Switch-mode –Background in Converter TopologiesBackground in Converter Topologies Defining Electrical Specifications –Knowing Your Input SpecificationsKnowing Your Input Specifications Input Filtering Transient Suppression –Knowing Your Output SpecificationsKnowing Your Output Specifications Standards, Certificates & Regulations –Design for SafetyDesign for Safety Not Just Electrical Design –Thermal IssuesThermal Issues Safe Operating Area –The Module as a ComponentThe Module as a Component Welcome, Celestica is a world leader in designing power supply solutions to address your needs. However, the more our customers understand our capabilities, the better we can fully meet those needs, now and in the future. For those of you who are new to specifying power supplies or need a better understanding of power electronics, we offer the following presentation. Visit this page often as we add more topics. If you have special interests in a particular topic, please contact us at Celestica. Celestica

Introduction to Power Electronics and Modules by Prof. DC Hopkins, © 2002 Direct board mount or integral modules 30A high-efficiency, high-transient isolated power supply Isolated power supply for high-end micro-processor

Introduction to Power Electronics and Modules by Prof. DC Hopkins, © 2002 Board-Mount Power Celestica offers highly dense power for board mount applications.

Introduction to Power Electronics and Modules by Prof. DC Hopkins, © 2002 Knowing Your Input Specifications Power Supply I in V in I out V out Defining Electrical Input Specifications SPECIFICATIONS Electrical Power Input V dc Input V in range I in range Efficiency Ripple current Switching noise Surge/Start-up current V ac Input V in-rms range I in-rms range Efficiency Sags, surges and transients Hold-up time Power factor In-rush current Noise and THD

Introduction to Power Electronics and Modules by Prof. DC Hopkins, © 2002 DC Input Specification - Vin Typical DC sources: –Car Battery - typical 12 volts with 11 to 14 volts variation –Solar Cell to 1 volt per cell depending on sunlight –Telecom Bus - nominal 48 volts with 36 to 72 volts variation –PC internal - 5 volts, +/- 10% Example: A Telecom bus has a Vin operating range of 36 to 72 volts. –If the input voltage drops below 36V, a supply will typically shut down. –If the input voltage exceeds 72V, a power supply may be damaged by the excessive high voltage. A supply can be designed so it can handle short durations of high input voltage, such as line transients due to lightning or surges. For example, a supply may have a surge rating of 100V for 100usec. Specifying Vin defines the source voltage operating range.

Introduction to Power Electronics and Modules by Prof. DC Hopkins, © 2002 DC Input Specification - I in, P out,  Pout (output power) = Vout x Iout  (efficiency of the PS) = Pout / (Vin x Iin) –Typically between 0.5 to 0.98 Substituting and solving for Iin Iin = (Vout x Iout) / (Vin x  ) Iin is the current drawn by the power supply (PS) and derived by Note: Worst case Iin occurs at lowest value of Vin, e.g. for telecom, the most current is at Vin = 36 V.

Introduction to Power Electronics and Modules by Prof. DC Hopkins, © 2002 Irip Iin Time DC Input Specification - Irip Irip is specified as peak-to-peak occurs at usually < 10Mhz typically, < 10% of max Iin –For example, if Iin max is 10A, Irip p-p should be less than 1A Iin has a ripple current, Irip, due to internal power switching.