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Operation principle and hardware description 19
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 is not
included in 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. ABB also recommends 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.
Main circuit diagram
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The DC/DC converter module must be equipped with external DC fuses. You can equip
the converter with a DC switch-disconnector, if quick isolation of the module from
the DC bus is required.
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