Definitions for "Inrush Current"
Related Terms:
Current source, Surge current, Open circuit voltage, Volt-amperes, Supply current, Voltage multiplier, Vac, Open-circuit voltage, Apparent power, Milliamps, Low voltage, Operating voltage, Load current, Amperes, Vdc, Rectifier, Load, Surge, Soft start, Clamping voltage, Compliance voltage, Volt-ampere, Power surge, Inductive load, Var, Peak inverse voltage, Quiescent current, Transformer, Spike , Voltage spike, Voltage drop, Peak current, Line voltage, Alternator, Shunt regulator, Bias current, Inverter, Crowbar, Amperage, Bias, Rated voltage, Snubber, Volts, Normal mode voltage, Surge protectors, Isolation voltage, Direct current, Surge protector, Reactive power, Overload protection
The current surge generated when a piece of equipment such as a servo amplifier is connected to an AC line. This surge is typically due to the impulse charging of a large capacitor located in the equipment.
The ac input current as measured during the initial turn-on of the power supply. This current reduces to a lower steady-state current once the input capacitors charge.
The peak power that a load will draw at the instant that it starts up.
An abnormally high current which is occasionally drawn when a transformer is first energized, due to residual flux in the core.
Peak instantaneous input current drawn by a unit upon the initial application of input voltage.
In a solenoid or coil, the steady-state current drawn from the line with the armature, or plunger, in its maximum open position.
The peak instantaneous input current drawn by a power supply when it is powered on.
Inrush current is the initial surge of current that results when power is first applied to a load having a low starting impedance, such as a discharged capacitor, a cold lamp filament, or a stopped motor's winding.
The peak current drawn by a device upon first application of the supply voltage, usually the result of transformer magnetizing current or the charging of input filter capacitors. Some converters feature circuits which will reduce inrush current, thus eliminating nuisance tripping of input circuit breakers.
A surge of current which occurs during the turn on phase of a power supply as the bulk capacitors are charged.
The peak value of current which a load requires when first being energized. Certain types of loads (i.e. lamps, motors) will draw a larger initial current because their impedance is lower at startup than during steady state operation.
A high surge of input current that occurs in switchers and occasionally in linears upon initial turn on .
The peak current flowing into a power supply the instant AC power is applied. This peak is usually much higher than the typical input current due to the charging of the input filter capacitors. When switching power supplies are first turned on, they present high initial currents as a result of filter capacitor impedance. These large filter capacitors act like a short circuit, producing an immediate inrush surge current with a fast rise time. The peak inrush current can be several orders of magnitude greater than the supply's typical current.
Maximum, instantaneous input current drawn by a converter at turn on. Also called Input Surge Current.
That current which surges into a low impedance load or that which is drawn by a transformer during saturation.
The initial surge of current required by a load before resistance or impedance increases to its normal operating value.
The peak instantaneous input current drawn by a SMPS at turn-on.
The initial surge of a current into a load before it attains normal operating condition. Certain types of loads, such as motors, compressors, air conditioners, power tools and other large loads require 2-5 times the energy on startup than they do continuously. Incandescent, filament style light bulbs tend to dim briefly when a motorized load, like a window air conditioner, pulls a high degree of inrush current on startup.
See Current (Inrush)
The initial momentary surge current demand before a load resistance of impedance increases to its normal operating value.
This is when the transformer has a short current surge through it, from residual flux, occurring at the moment energy is applied to the transformer.
The current which flows at the instant when the input is applied. With a switching power supply, a large current, which is several ten to several hundred times greater than the normal input current, flows into the circuit. Such a large current is intended to charge a capacitor. The drawbacks are: the blowout of the fuses attached outside the power supply, the meltage of relays and switches, and the trip of no fuse breakers (NFB). Therefore, an inrush current protective circuit is provided to limit the inrush current.
The peak AC current that flows into a battery charger or power supply during the initial period AC power is applied. This peak is usually greater than the normal operating current.
Inrush current or input surge current refers to the maximum, instantaneous input current drawn by an electrical device when first turned on. For example, incandescent light bulbs have high inrush currents until their filaments warm up and their resistance increases. Alternating current electric motors and transformers may draw several times their normal full-load current when first energized, for a few cycles of the input waveform.