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Operation principle and hardware description 17
2
Operation principle and hardware
description
Contents of this chapter
This chapter describes the DC/DC converter operation basics and the hardware of the
converter.
Operation principle
The DC/DC converter unit (DDC) transfers energy from a common DC bus of a drive into
an external energy storage and discharges energy back to the DC bus. The energy storage
can be, for example, a battery or super capacitor. The energy storage media does not belong
to the DC/DC module product offering.
The DC/DC converter unit has a single converter module or parallel converter modules
under the command of one control unit. Parallel DC/DC converter modules must have a
common energy storage. Each parallel module must have the output cabling of its own. We
also recommend that you use identical cablings (cable type, cross-sectional area, and
length) and have identical load for each module. For other solutions, contact ABB.
Typically, the DC/DC converter is used in marine applications for heave compensation,
peak load compensation, propulsion supply in harbors, energy storing instead of an additional
generator and so on. The DC/DC converter can also be used in automotive applications
such as electric car charging systems and also in several other applications where energy
storing and reuse is needed.
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