Digital concept and applications

The digital power supply series SDP (Software Defined Power) is the expansion and logical sequel to the HEVW platform. It combines the modular approach and the mechanical design variety with all advantages of digital control and was developed for an extremely broad range of applications - as an open system using modern technology that can be adjusted to our customers' wishes and market requirements. It is used in

• automation
• laboratory and testing technology
• surface engineering
• lighting systems
• fuel cell simulation
• solar simulation
• testing and simulation for charging technologies
• laser technology and connection in series of power sources in master/slave mode
• telecontrol systems

Scalability

With only six basic elements, output voltages between 24 V and 400 V are available for the power classes 700 W, 1600 W and 2500 W.  The modules can be equipped with DC inputs from 12 V to 400 V and AC inputs from 110 V to 230 V.

Modularity and power extensions

The power of units identical in construction can be extended by a parallel connection. The devices' currents are matched with digital precision. A serial connection is also possible. With the optional controller card MC2 the group acts as one unit. We can connect up to 16 parallel channels. The maximum voltage for the series circuit is 1000 V.

Options and accessories

The controller card MC2 is available as a pure interface card or with an additional control unit: Graphic display with rotary encoder module and optional hardkeys. Plug connections can be adapted to your requirements.

Mechanics

The modularity makes various mechanical installations possible. Apart from the 3 HE standard size, 2 HE and 6 HE and table versions are available. On request we are happy to integrate the module into an IP54 housing or customised housing for you.

Compact plug-in unit with high power density and efficiency

Up to 7.5 kW can be configured in a 19-inch plug-in unit with 3 HE / 320 mm, and 15 kW in a 6 HE unit. The stand-alone device has a maximum power output of 2500 W and consists of the PFC(power factor correction) and the EDC ( singleEurocardDC-DC-converter). The PFC converts the 115 V or 230 V AC voltage into a 390 V DC voltage using a semi-soft switching booster, that serves as an input voltage for the soft-switching 100 kHz full bridge. Depending on the output voltage, the output rectification is carried out synchronised with Power MOSFETs or ultra fast diodes. The potential-free power transfer occurs at 100 kHZ.

Fully digital control, high precision, long-term stability

The monitoring, control and regulation of the output voltage is carried out by a state-of-the-art digital signal processor (DSP). Digitalisation results not only in high reproducibility and long-term stability, but also in many additional features than would normally be possible. It makes the power supply unit more adaptable to environmental conditions and alternative operation modes.

Higher loads, faster availability and higher volumes through digitalisation

It is much cheaper to realise software adaptations than to design new hardware solutions, especially because they also have an effect on logistics, storage and purchase. Digital solutions broaden the customer-specific basis of a producer and his customer's ability to supply. The diversity of circuit boards ICs and modules is decreasing.

Examples for software solutions:

Auto Sense Select

Calculates the compensation values through the calibration of wire lengths. Easy to control despite simple wiring!

Capacity Charge

Adds up generated charge. Interesting not only for battery systems!

High Peak Current Integrator

The constant power limit is replaced by a dynamic power limit that is adjusted to the degree of the overload (up to ten times). Optimal use of system resources

Auto Input voltage de-rating

Adjusts the maximum power output to the reduced power input at 115 V_AC (non-linear function).

Product Selector

Parameters for power and voltage are selected from a database and parameterised for a certain product.

Auto ambient Temperature De-rating

Adjusts the maximum power output to the current ambient temperature.

Group mode

The digitalisation of power supply units facilitates the connection of individual devices parallel to each other or in series.  This group can then be controlled as a single unit. The configured device works in balanced synchronisation. I, U, P and R can be programmed like in a normal laboratory power supply unit. The overall system can be extended, if the power or electricity demand of the application changes.

Parallel and serial mode

Up to 16 modules with a maximum of 400 V can be connected.

Overload mode

For applications with several loads that need to be operated separately, up to 16 independent channels with a superior control can be configured. The starting times can be programmed via the management Card MC2 . The maximum parallel serial voltage is 150 V. The individual devices of the unit are controlled via the MC2.

Overview of digital converters

Maximum power A in dependency of input and output voltage