Glossary of power supplies (1)

Here is some Glossary of power supplies:

Line regulation: How much the load voltage or current changes when the power supply isoperated at varying line voltages throughout a given range. Typically stated as a percentage of the total voltage or current available from the supply. A rating of “0%” would mean perfect regulation.

Load regulation: How much the load voltage or current changes between operating the power supply at no-load and full-load conditions. Typically stated as a percentage of the total voltage or current available from the supply. A rating of “0%” would mean perfect regulation.

Efficiency: Measured in percentage, it indicates the amount of power being output over the amount of power consumed in a system.

EMI: Electromagnetic Interference

Inrush current: An initial amount of current drawn by a power supply at startup.  It is sometimes referred to as startup current and it’s generally several magnitudes greater than the steady-state value of the supply.

Inverter: A electrical device used to convert DC to AC power.

Remote sensing: Provided in some instruments that can be used to sense a DUT’s voltage at its terminal in order to provide accurate readings to compensate for voltage drops across leads connected to the instrument and the DUT.

Constant voltage: A regulated power supply that delivers a constant voltage to a load even when the load resistance changes to a value that will not exceed the power supplies current limit.

Constant current: A regulated power supply that delivers a constant current to a load, even when the load resistance changes. Note that the power supply must follow Ohm’s Law.

Current limit: A value set as a limit on the current a power supply can output.  When current reaches the limit, a typical CV/CC power supply will switch from CV to CC mode.  This is also known as the crossover point.

Overload protection: A protection feature in most DC power supplies to prevent any device from drawing more power than the supplies are intended to produce.

Overvoltage protection: Protection found in many power supplies that limits the amount of voltage that can be output.

Parallel operation: Found in many dual and triple output power supplies, this mode of operation allows two or more independent outputs to connect together in parallel to increase the current output.

Series operation: A mode of operation in many dual and triple output power supplies in which connect two or more independent outputs in series to increase the voltage output.

PARD: Periodic (ripple) and random (noise) deviations of an output voltage from the desired value.

PWM: Pulse Width Modulation

Resolution: The smallest change in voltage or current that can be made by an adjustment of the controls.

Thermal protection: Protection against damage to the supply due to excessive temperature

Transient recovery time : The amount of time it takes for a power supply to recover its output after a step change.

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