SINAMICS DC-DC power converters for industrial applications

Key visual DC DC Converter

In industry, the focus is on maximum productivity, energy efficiency, and component reliability In addition, the reduction of CO2 greenhouse gases is a constant challenge. This requires a tailor-made solution for each specific task. Power grids are becoming increasingly volatile as more and more renewable energy sources feed power into them. This can also have an impact on the stability of industrial networks. DC-DC Converters make it possible to integrate storage systems into the drive line-up. So, for example, regenerative energy can be stored temporarily and then used for the process as required. The stored energy can also be supplied to the drive line-up in the event of peak load requirements or power failures. Siemens offers DC-DC Converters from the SINAMICS product family for these different applications.

DC-DC Converters - selection, configuration, purchasing

Configure now


Introducing the SINAMICS DCP 250kW

The Compact DC-DC Converter SINAMICS DCP 250 kW is available now.

This means that a total of three Compact DC-DC Converters are available for connecting batteries or ultracaps to an industrial drive train.

The SINAMICS DCP 250 kW delivers a constant current from 250A to 1000 VDC and the continuous operating range goes from 0...1200 VDC.

DC-DC power converters

Overview of benefits

Always the right option for any application, power and requirement: the wide variety of SINAMICS DC-DC Converters means you can always find a custom-fit solution for any application.

Compact DC-DC power converters

With SINAMICS DCP Siemens starts a new generation bidirectional DC/DC converter. Siemens combines its expertise in DC technology with the advantages of the proven SINAMICS family. Thus it sets standards when it comes to quality, reliability and technical functionality..

SINAMICS DCP, a scalable DC-DC Power Converter suited for both industrial and smart grid applications, is a combined buck / boost converter in one device. Overlapping voltage ranges at the input and output are possible by means of 4Q operation. This means that the DC output voltage can be lower or higher than the DC input voltage and for variable voltage levels, current can flow in both directions making SINAMICS DCP the ideal solution for charging and discharging batteries and supercapacitors.. Given its high switching frequency, SINAMICS DCP is very compact and lightweight.


Ready-to-go equipment

The SINAMICS DCP is a Compact DC-DC Converter that is ready for immediate use without the need for additional engineering. A power extension can also be easily implemented by connecting several SINAMICS DCPs in parallel.


Bringing both worlds together

As a buck and boost converter, the SINAMICS DCP is capable of connecting two different DC voltage systems at different voltage levels for easy energy exchange. As a result, fewer components are required and installation space is saved.

The high efficiency of SINAMICS DCP maximizes the overall energy fed into the public grid, island grid, microgrid or the internal power system of a factory when it is used to interconnect DC energy sources (e.g. photovoltaics, fuel cells) and energy storage systems (e.g. rechargeable batteries, SuperCaps) to the common DC bus of a grid converter/infeed inverter such as a SINAMICS S120 Active Line Module.


A PROFIBUS communication interface is included as standard. The communications interfaces of the Advanced CUD can be supplemented using additional modules - such as the optional CBE20 for PROFINET or EtherNet/IP™.


The BOP20 basic operator panel is available for simple commissioning and local operator control.


STARTER software is used for the parameter assignment and diagnostics.

User benefits
Combined buck/boost converter in one device
Optimized adaption to energy storage systems and the common DC bus of an infeed inverter or grid converter
Energy flow in both directions, charge and discharge a battery or supercapacitor with one device
High efficiency - up to 98.6%
Maximum  energy harvest
Wide voltage range

Along with bidirectional power flow capability and high efficiency, SINAMICS DCP provides an optimal interconnection of energy storage systems (rechargeable batteries, SuperCaps) to the common DC bus of a grid converter, such as an Active Line Module


Different infeed sources (solar, fuel cells, wind, etc.) can be connected to the common DC bus of an Active Line Module, via SINAMICS DCPs and Motor Modules, and realize a multi generator system

Scalable power from 30 to 480 kW

High currents by connecting up to 4 devices in parallel at the input and / or output

High switching frequency

Low current ripple and high voltage quality 


Compact and lightweight design, control unit and reactors are built-in

High flexibility with 4Q operation

A 4Q converter can be applied as a boost or as a buck converter where the DC output voltage can be lower or higher than the DC input voltage, e.g. charging and discharging a battery


Allows overlapping voltage ranges at the input and output

High maximum voltage 
1,000 VDC (Imax = 5 A for 30 sec, every 5 min. 
(only 30 kW DCP)
To connect PV arrays under no-load conditions
Functionality can be expanded using additional SINAMICS drive components, e.g., SINAMICS S120 Active Line Module
Different infeed sources (solar, wind, etc.) can be connected together to realize a multi generator system
Integrated systems from one source
Well-known and easy operating philosophy from the SINAMICS AC and DC drives family

Technical specifications

30 kW DCP
120 kW DCP
250 kW DCP
Operating voltage range
0 to 1,000 V DC
0 to 1,000 V DC
0 to 1,200 V DC
Rated current DC
50 A
200 A
250 A
Rated power
30 kW @ Imax = 50 A, 
Vin = Vout = 600 V DC
120 kW @ Imax = 200 A, 
Vin = Vout = 600 V DC
250 kW @ Imax = 250 A, 
Vin = Vout = 600 V DC
Electrical isolation
4x parallel, input and / or output
Maximum efficiency
> 98%
PROFIBUS, PROFINET, EtherNet/IP™, DRIVE CLiQ with OALINK connection to CU320-2
Closed-loop control
Current, voltage and power
Control module
Own control unit
Protection degree
Certifications / approvals

IEC 62109-1

IEC 61800-5-1

IEC 61800-3

UL 508C

UL 61800-5-1

CSA C22.2 No. 274

Software functions

Four-quadrant considerations


  • A 4Q converter can be applied as a boost or buck converter
  • The DC output voltage can be lower or higher than the DC input voltage, i.e. charge and discharge a battery
  • P1, N1 (DC Bus – Input) and P2, N2 (Battery – Output) refer to the input and output terminals of the converter


Overlapping voltage ranges at the input and output are possible by means of 4Q operation


The main application of SINAMICS DCP is to control the electrical power flow between two DC systems:

  • From a DC bus (input side 1, terminals P1 & N1) to a stationary battery (output side 2, terminals P2 & N2). 
    This is called motoring operation and means positive current

  • From a battery (output side 2, terminals P2 & N2) back to the DC bus (input side 1, terminals P1 & N1). 
    This is called generating operation and means negative current

The power flow in both directions (from the DC bus to the battery and from the battery to the DC bus) is called bidirectional.


The voltages in the two DC circuits are independent of one another.

The electrical power flow, controlled by a signed (+ or -) current or power setpoint specification, is possible regardless of the voltages in the two DC circuits (in the nominal range).

Input voltage 
terminals P1, N1
Output voltage 
terminals P2, N2
Voltage flow
Input >> Output
Output >> Input
Output >> Input
Input >> Output

Application example
SINAMICS DCP - Energy storage with capacitors

Detailed information in the Industry Mall Industry Mall
Industry Mall

Configure and order SINAMICS DCP

Using the Siemens Drive Configurator, you can simply and quickly configure your SINAMICS DCP system and then order it through Industry Mall.


Engineered DC-DC converters

A Motor Module from the SINAMICS S120 multi-axis system is the core component of the Engineered DC-DC Converter. By adding supplementary components it becomes a complete DC-DC power converter that can be individually adapted to the application.

Everything from a single source

The Engineered DC-DC power converter is based on the SINAMICS S120 multi-axis platform and can therefore be easily integrated into the SINAMICS S120 drive line-up mechanically, electrically and in terms of software. This generates synergy effects such as a uniform look & feel, the use of existing communication interfaces and a universal design.


Drawing on abundant resources

The Motor Module for the Engineered DC-DC converter can be selected from the finely gauged power range of the SINAMICS S120 platform. This allows for power requirements up to the megawatt range as well as different cooling methods. Motor Modules with air and liquid cooling are available. The Engineered DC-DC converter can also be deployed in harsh environmental conditions.


Perfectly adaptable

Selecting the right Motor Module and the associated components, such as the output filter, helps to optimize the Engineered DC-DC Converter for the specific application. The flexibility in terms of power, design and voltage class allows special customer requirements to be satisfied perfectly.

* Additional components necessary: CU320-2, VSM10, storage reactor and, if applicable, capacitor module

** Depending on the supported motor module of the respective application

SINAMICS S120 Motor Module Booksize*
SINAMICS S120 Motor Module Chassis (400VAC)*
SINAMICS S120 Motor Module Chassis (690VAC)*
DC-link voltage
510 - 720 VDC
510 - 720 VDC
675 - 1,080 VDC
Voltage range output DC
10 - 710 VDC
10 - 710 VDC
20 - 1,060 VDC
Rated current DC
6 - 200 A**
210 - 1,405 A**
85 - 1,560 A**
Electrical isolation

Application examples

Get more of what you need to know about SINAMICS S120 drives

Learn more about the world's most successful high-performance drive system.

Configure and order SINAMICS S120

Using the Siemens Drive Configurator, you can simply and quickly configure your SINAMICS S120 system and then order it through Industry Mall.

Downloads and support

More information about SINAMICS DC-DC conversion technology