Glossary of Power Supply Terms Rev 3.0 – May 2014 Glossary of Power Supply Terms Index A....................................................................................................................................................................... 1 B....................................................................................................................................................................... 2 C....................................................................................................................................................................... 4 D....................................................................................................................................................................... 8 E..................................................................................................................................................................... 10 F..................................................................................................................................................................... 12 G..................................................................................................................................................................... 14 H..................................................................................................................................................................... 15 I....................................................................................................................................................................... 17 J...................................................................................................................................................................... 19 K..................................................................................................................................................................... 20 L...................................................................................................................................................................... 21 M..................................................................................................................................................................... 23 N..................................................................................................................................................................... 25 O..................................................................................................................................................................... 26 P..................................................................................................................................................................... 28 Q..................................................................................................................................................................... 31 R..................................................................................................................................................................... 32 S..................................................................................................................................................................... 34 T..................................................................................................................................................................... 38 U..................................................................................................................................................................... 40 V..................................................................................................................................................................... 41 W.................................................................................................................................................................... 42 X..................................................................................................................................................................... 43 Y..................................................................................................................................................................... 44 Z..................................................................................................................................................................... 45 Useful Conversion factors...............................................................................................................................46 Prefixes........................................................................................................................................................................... 46 Lengths........................................................................................................................................................................... 46 Temperature....................................................................................................................................................................46 Weights........................................................................................................................................................................... 47 Airflow............................................................................................................................................................................. 47 Energy............................................................................................................................................................................. 48 Cable Size....................................................................................................................................................................... 49 Useful Calculations......................................................................................................................................... 51 Resistance and Ohm's Law.............................................................................................................................................51 Reactance....................................................................................................................................................................... 51 Voltage Divider Rule:......................................................................................................................................................51 Electrical Energy and Power...........................................................................................................................................51 Capacitors....................................................................................................................................................................... 52 RC Circuits...................................................................................................................................................................... 52 Inductors......................................................................................................................................................................... 52 RL Circuits....................................................................................................................................................................... 53 RLC Circuits (Series Resonant)......................................................................................................................................53 RLC Circuits (Parallel Resonant)....................................................................................................................................54 Installation for optimum EMC performance.....................................................................................................55 Mounting......................................................................................................................................................................... 55 Cables............................................................................................................................................................................. 55 Connecting between boxes.............................................................................................................................................55 Earth star point................................................................................................................................................................55 External Fusing............................................................................................................................................... 56 Safety Approvals............................................................................................................................................. 57 TDK-Lambda Company Contacts...................................................................................................................58 Page ii Doc No 69639 Issue 2.2 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Glossary of Power Supply Terms A A - Abbreviation for ampere. ac - Abbreviation for Alternating Current (written in lower case 'ac'). ac Brownout – See Brownout. ac-dc converter – A device that changes ac input voltage/current to a different dc output voltage/current. See Power Supply. ac Line – A conductor that routes ac voltage from one point