DC Link Chokes
Product Overview
- 1000 Volts DC
- Filters 300/360 Hz Ripple Current
Use DC Link Chokes in Many Applications Such As:
- AC PWM inverters/drives
- DC to AC inverters
- Variable frequency motor drives
- Electric vehicle inverters
Economical, Versatile Power Quality Solutions
For Variable Speed Drives & Inverters
Add MTE DC Link Chokes in series with the internal DC bus to:
- Reduce AC Input Line Harmonics
- Help Meet IEEE-519 Limits
- Absorb Voltage/Current Spikes
- Reduce AC ripple on DC bus
- Reduce dV/dT and dI/dT rates
- Solve nuisance overvoltage tripping
- Reduce DC Bus Transient Overvoltage
When added between the input rectifier and bus capacitor the link choke will improve the DC bus waveform and the
AC input waveform. In this location the DC reactor will reduce the amount of AC ripple on the DC bus, reduce the AC
input line harmonics and offer protection against nuisance tripping due to voltgae spikes such as those caused by
capacitor switching. However, a DC link choke, will not offer protection of the input rectifiers.
DC link chokes offer the advantage of maximizing the circuit inductance for power quality reasons, but without
causing an AC input line voltage drop. DC link chokes can be used individually, typically on the positive DC bus,
or in pairs with one each on both the positive and negative bus. When two DC reactors are used on the bus, the
inductance is additive. You will need twice as much inductance on the DC bus as used on the AC input (per phase)
to accomplish the same performance experienced with AC input reactors. For best performance, combine the use
of both an AC input reactor and a DC link choke.
MTE Corporation DC Link Chokes are an economical means of filtering and controlling the DC bus voltage and
current in a variable speed drive/inverter. They help reduce AC input line current harmonic distortion while
absorbing DC bus voltage spikes. Link Chokes add protection and filtering but should not be considered a
direct alternative to AC input or output reactors. While DC Link Chokes increase the internal filtering and
have the ability to absorb spikes, because of their circuit location they do not protect the input bridge rectifier.
They do not offer protection for the inverter output circuit due to their location on the DC bus.
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