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A B C D E F G H I J K L M N O P Q R S T U V W X-Z #

Back Electromotive Force (Back EMF)

An EMF that occurs in electric motors where there is motion between the armature of the motor and the external magnetic field. See also Counter Electromotive Force.

Backup Power Supply

A power supply (PSU) used to provide alternate system power in the event the primary power source fails or is unable to continue providing adequate system power.

Balun

Converts between balanced and unbalanced electrical signals/power. A differential wound choke used as an EMI filter component. Presents a high impedance to common-mode signals and a low impedance to differential mode signals.

Base Transceiver Station

A telecommunications term (usually referring to mobile phone installations) describing an installation which contains the transceivers, antennae and equipment for encrypting and decrypting communication with the Base Station Controller.

Baseplate

Mounting platform for power supply (PSU) (either ac/dc or dc/dc) components.

Baseplate Temperature

The temperature at the hottest spot on the mounting platform of the power supply.

Basic Insulation

The insulation applied to live parts to provide basic protection against electric shock. See also Insulation, Double Insulation, Reinforced Insulation, Supplementary Insulation.

Battery Charger

Electrical equipment designed to charge batteries.

Bead

A small ferrite normally used as a high frequency inductor core also a ceramic component used to space resistors from PCB's.

Bench Power Supply

A power source / power supply (PSU) used for bench-top use in a laboratory. Normally has adjustable voltage / current with displays showing settings. TDK-Lambda's Genesys range of supplies is designed for bench top use and has adjustable current and voltage limits.

Bifilar Winding

Two conductors wound side by side.

Bipolar Junction Transistor (BJT)

A type of Transistor with 3 terminals. Used as either a switch or amplifier.

 

Schematic Symbols for BJT's

BJT

Abbreviation for Bipolar Junction Transistor.

Bleed

A low current drain from a power source.

Bleed Resistor

A resistor that allows a current drain on a power source. Usually to discharge filter capacitors or to stabilise an output. See Minimum Load.

Bobbin

An insulator used to support windings.

Bonding

Permanently joining all non-current-carrying metal parts to ensure electrical continuity and the ability to conduct safely any current likely to be imposed on it. Often called Earth Bonding.

Boost Converter

A switching power supply topology. It accepts variable dc input voltage and converts it to a higher dc voltage.

Boost Regulator

See Boost Converter

Breakdown Voltage

1) The voltage level at which insulation fails.

2) The reverse voltage at which a semiconductor device changes its conductive characteristics.

Brick

See Full Brick

Bridge Rectifier

Full-wave rectifier circuit employing two or more rectifiers in a bridge configuration. Compare with Half-Wave Rectifier

Bridge Rectifier

British Standards Institute

The National Standards Body of the UK, founded in 1901, develops standards and standardization solutions to meet the needs of business and society. (http://www.bsiglobal.com/)

Brownout

The condition created when the electricity supply (usually ac) falls below the minimum level specified for the system. Some brownouts are made intentionally to prevent a full power outage during periods of electricity demand overload.

BSI

Abbreviation for British Standards Institute

BTS

Abbreviation for Base Transceiver Station

Buck Regulator

A power supply topology which accepts an unregulated dc input voltage and produces a regulated lower output dc voltage.

Bulk Capacitor

The energy storage capacitor at the front end of a regulator.

Bulk Voltage

The voltage across a bulk capacitor.

Burn In

The operation of a newly fabricated device or system prior to application with the intent to stabilise the device, detect defects, and expose infant mortality. See also Power Cycle

Bus

Conductor which distributes power (or signals) from a power source (or signal source) to two or more separate circuits.

Bus Converter

A type of dc-dc converter usually used in Distributed Power Architecture which provides an isolated intermediate bus voltage to power non-isolated Point of Load Converters. Usually 48Vdc input, 12Vdc output. Lambda's range of bus converters includes the iEB and iQD ranges.

A B C D E F G H I J K L M N O P Q R S T U V W X-Z #

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