What is a DC link?
A DC link is an element connected between multiple power supplies. It can both couple these power supplies and act as a buffer storage for electrical energy. In practice, it is used to synchronize frequencies of different power supplies, for example.
Why do we use DC links in electrical drives?
The use of DC links in electrical drives offers an enormous savings potential. On the one hand, DC links increase energy efficiency, because energy that is already generated in braking processes, for example, can be used as a generator and stored temporarily before being released again for acceleration.
What is DC link voltage?
DC link voltage: This is the voltage that prevails in DC links. This voltage fluctuates due to the continuous input and output of energy and is adjusted in each case by means of the adjacent converters. DC link capacitor: This is the actual energy storage device. Pre-charging circuit: In a DC link, this circuit consists of electrical resistors.
What is a DC link capacitor C bulk?
The DC link capacitor C bulk is placed between the rectifier and DC/DC converter. Desired characteristics for the capacitor include: To meet the large capacitance values, multiple capacitors or a capacitor array is required. We recommend using our high-capacitance StackiCap - 250V-1.2kV 100nF-5.6µF X7R capacitors for such applications.
Which capacitors are used in DC link applications?
Aluminum electrolytic and metalized film capacitors are the most commonly used technologies in DC link applications. Film capacitors are available with higher voltage ratings than aluminum electrolytics. In some applications, lower-cost aluminum electrolytic capacitors are used in series to increase the effective voltage rating.
Why should you use a DC link?
In addition, the energy stored in a DC link enables a controlled system shutdown in the event of faults, such as power failures. This eliminates the need for an independent power supply (UPS), which prevents damage resulting from sudden failures during emergencies. In the big picture, this means yet another potential source of cost savings.
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DC-Link Capacitors
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Energy Storage
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AC-to-AC converter
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