A constant current (steady current, time-independent current, stationary current) is a type of direct current (DC) that does not change its intensity with time.
If the load is constant, a steady current can be obtained via a constant voltage source. If the load is varying, a steady current can be obtained via a constant current supply source.
Constant voltage sourcesedit
An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or facilitating chemical reactions through the introduction of electrical energy. A common example of an electrochemical cell is a standard 1.5-volt cell meant for consumer use. This type of device is known as a single Galvanic cell, so an obsolete name for steady current was galvanic current. A battery consists of two or more cells, connected in either parallel or series pattern.[1]
A homopolar generator is an electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field. A magnetohydrodynamic generator directly extracts electric power from moving hot gases through a magnetic field, without the use of rotating electromagnetic machinery.
AC generators can be used as sources of steady current with a rectifier and a good ripple filter. Pulsed DC generators can be used as sources of steady current with a good ripple filter.
Constant current power suppliesedit
In electronics, a constant current system is one that varies the voltage across a load to maintain a constant electric current. When a component is indicated to be driven by a constant current, the driver circuit is, in essence, a current regulator and must appear to the component as a current source of suitable reliability.
An important usage of constant current power supplies is with LEDs. While a high series resistance is sufficient to light an LED, sometimes the design needs to guard against high current (or risk burning out the LEDs).
constant, current, constant, current, steady, current, time, independent, current, stationary, current, type, direct, current, that, does, change, intensity, with, time, contents, sources, constant, voltage, sources, power, supplies, constant, current, source,. A constant current steady current time independent current stationary current is a type of direct current DC that does not change its intensity with time Contents 1 Sources 1 1 Constant voltage sources 1 2 Constant current power supplies 1 2 1 Constant Current Source Applications for LEDs 2 See also 3 ReferencesSources editIf the load is constant a steady current can be obtained via a constant voltage source If the load is varying a steady current can be obtained via a constant current supply source Constant voltage sources edit An electrochemical cell is a device capable of either generating electrical energy from chemical reactions or facilitating chemical reactions through the introduction of electrical energy A common example of an electrochemical cell is a standard 1 5 volt cell meant for consumer use This type of device is known as a single Galvanic cell so an obsolete name for steady current was galvanic current A battery consists of two or more cells connected in either parallel or series pattern 1 A homopolar generator is an electrical generator comprising an electrically conductive disc or cylinder rotating in a plane perpendicular to a uniform static magnetic field A magnetohydrodynamic generator directly extracts electric power from moving hot gases through a magnetic field without the use of rotating electromagnetic machinery AC generators can be used as sources of steady current with a rectifier and a good ripple filter Pulsed DC generators can be used as sources of steady current with a good ripple filter Constant current power supplies edit In electronics a constant current system is one that varies the voltage across a load to maintain a constant electric current When a component is indicated to be driven by a constant current the driver circuit is in essence a current regulator and must appear to the component as a current source of suitable reliability An important usage of constant current power supplies is with LEDs While a high series resistance is sufficient to light an LED sometimes the design needs to guard against high current or risk burning out the LEDs Another use is in fluorescent lamps which have very dynamic electrical resistance and are optimally operated within a short range of currents 2 Other uses include shielded metal arc welding and gas tungsten arc welding 3 Constant Current Source Applications for LEDs edit Reliability Testing Device Burn in Test HASS and IESNA LM 80 Applications Energy Star Certification Calibration Lamp Drive DC Driven Lamps Resistor Aging Laser Diode DC Drive 4 See also editCurrent source LED circuitReferences edit Electrochemical Cells Caladen Circuit Corner before Sep 5 2009 LED Current Controller Archived 2005 01 13 at archive today CONSTANT VOLTAGE POWER SOURCE American Welding Society Retrieved 2021 09 17 SpikeSafe DC Current Sources Vektrex Vektrex Retrieved 2017 08 28 nbsp This electronics related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Constant current amp oldid 1190284396, wikipedia, wiki, book, books, library,
