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- A line driver may handle analog signals such as traditional video, standard audio, or even amplified outputs from sensors and transducers (most of which are analog) or digitized signals, but it still must deal with the unavoidably analog nature of sourcing and sinking current into a load while reaching the designated maximum and minimum voltage levels.
electronics360.globalspec.com/article/7114/drivers-the-critical-interface-between-a-circuit-and-its-loadDrivers: The Critical Interface Between a Circuit and Its Load
Jun 6, 2019 · The addition of a line reactor, sometimes known as a choke or inductor, helps protect your equipment from input power disruptions that damage the drive. Line reactors are electro-magnetic devices which consist of a steel core wrapped with copper coils.
Oct 20, 2014 · There are two principal functions of this line driver. The first is to provide a power gain. The circuits that are driving the inputs may not have the power to drive the impedance of a longer wire length.
- What Is A Reactor:
- Side-Effects of adding a Reactor:
- A Reactor as a line voltage buffer:
- Reactors at the drive output to increase load inductance:
- Reactors at the drive output to reduce the effect of reflected wave:
Let’s first define what a reactor is. Essentially a reactor is an inductor. Physically it is simply a coil of wire that allows a magnetic field to form around the coil when current flows through it. When energized, it is an electric magnet with the strength of the field being proportional to the amperage flowing and the number of turns. A simple lo...
Like most medication there are side-effects to using a reactor. Though these issues should not prevent the use of a reactor when one is required, the user should be aware of and ready to accommodate these effects. Since a reactor is made of wire (usually copper) wound in a coil, it will have the associated losses due to wire resistance. Also, if it...
In some cases, other switch gear on the line such as contactors and disconnects can cause line transients, particularly when inductive loads such as motors are switched off. In such cases, a voltage spike may occur at the input to the drive that could result in a surge of current at the input. If the voltage is high enough, a failure of the semicon...
Applying a reactor at the output of a drive is sometimes necessary. Again, all of the “side-effects” as previously stated hold true. And yes, there are a few instances when it may be necessary to add load impedance by inserting an output reactor. If the motor has a “low leakage inductance” a reactor can help bring the total load inductance back up ...
A reactor at the output of a drive is sometimes installed in order to prevent a reflected wave voltage spike when long motor leads are required. This is not always a good practice. Though the reactor will slope off the voltage rise time providing some benefit, It is not likely to limit the peak voltage at the motor. In some cases, a resonance can b...
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Line reactors help protect VFDs from utility power line disturbances that may cause un-expected tripping or damage to the VFDs. They also help reduce the harmonics that the VFD generates back into the utility grid. Line reactors should be used in the following circumstances: 1. Where the input voltage from the power line
A main purpose of these line choke is to protect thyristor form transient over current. Almost 100 % of the vfds are starting with series line choke. Line chokes are nothing but an inductance. I have used upto 280 mH line choke for my 400KVA ABB.
Jun 12, 2014 · A line reactor (also referred to as a "choke") is a variable frequency drive (VFD) accessory that consists of a coil of wire that forms a magnetic field as current flows through it. This magnetic field limits the rate of rise of the current, thus reducing harmonics and protecting the drive from power system surges and transients.
Line disturbances are common on power systems with power factor correction capacitors coming on and off line as well as the fluctuation of high current loads. Reactors also function to mitigate harmonic currents being drawn by the drive, and help block background incoming line voltage harmonics which may hinder
