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Bidirectional Modular PSUs

Bidirectional modular PSUs can combine in parallel, series and matrix configurations for high power outputs. Each system will also operate independently.

An example of an 8 module system with 500V units is illustrated. Each unit can operate as either a DC Source or Load. The integrated approach features high dynamics enabling users to switch quickly between quadrants.

An extensive feature set includes an inbuilt 8 channel recording scope, adjustable internal resistance, RS‑232 & analogue interfaces and an optional embedded function generator can be fitted, which allows virtually any complex DC waveform to be created.

The feature set is complimented by simple and intuitive application software. External hardware can also be integrated into existing LAB‑GSS software on request.

More info
Modular PSU Configurations

Main Features

  • Mains regeneration of the DC sink energy
  • Optional function generator with V/I capability over time
  • CC, CV and CP operating modes
  • Programmable PID controllers
  • Integrated scope function
  • Quick response times
Max. Module Power 32kW
Max. System Power 3MW
Max. Module Voltage 600V
Max. Module Current 600A

Options & Interfaces

Highlighted Options

  • /TFE Function Generator
    Complex DC waveforms can be implemented through an embedded function generator. Standard square, sawtooth, sine and user defined shapes can be plotted against time. V/I & V/W relationships can also be programmed. The function generator is operated through either TopCon operating software or the front panel.
  • /RCU Remote Control Unit
    An external control unit for controlling multi-module systems which reduces response times when implementing complex changes. The RCU is available as either a desktop unit or a 19" rackmounting module, with or without an emergency stop.
  • /PACOB Output Protection
    A specially produced cover which provides protection against accidental contact of output current bars. This safety option is available for both the AC and the DC connections.
  • /4111 Ruggedised Specification
    Ruggedisation of units to military standards is possible for shipborne and vehicle projects. Our design team can work with you to meet specific requirements and standards. This ensures suitability in harsh conditions by providing protection against shock, vibration and humidity.
  • Standard Interfaces

    • Isolated Analogue
    • RS-232

    Optional Interfaces

    • IEEE 488.2 (GPIB)
    • Front Panel Control
    • Ethernet
    • RS-422
    • USB
    • CAN

    System Range

    Module Rental

    Our ever expanding rental range provides a low cost solution for urgent or short term power test requirements up to 128kW. Systems can often be shipped by the next working day where lead times are crucial.

    • LAB‑GSS units available for rental are transported within specially-designed flight cases.
    • Grid-tied systems can be supplied separately or pre-connected for Series or Parallel operation.
    • Cranking curves or waveforms required for applications can be integrated into a test system for rental prior to delivery.
    Rental Power Supplies


    Following on from the success of the LAB‑GSS, a selection of lower voltage higher current modules have been developed. Aimed at the testing and verification of hybrid vehicle battery packs, units are now possible with nominal voltages of 65V and 130V at up to 600A.

    High Current Modules


    At 40kW the LAB‑GSS becomes the LAB-GSSH. High power, modular DC systems such as this can be reconfigured or expanded to meet changing test requirements. In-built dedicated system comms allow users to switch between various set-ups.

    Parallel, series or matrix configurations are all possible. Each slave module can operate independently providing unrivalled flexibility. Various standard and optional interfaces are available for remote control. A number of parameters are user adjustable including internal resistance as well aas voltage and current slopes. Systems are available up to 3MW. Lab racks and flight case integrations are available on request.

    High Power Test System


    We now also provide a special range of programmable bidirectional DC-DC converters. The high (line) side of each CON-DSS module is tied to a dedicated DC line. The converter features an adjustable input/output on the low side, so that it can be optimised for a specific application.

    As the system is based on the LAB‑GSS product platform it shares the same extensive feature set and options. One highlighted option is the high speed 1kHz CAN interface. This is particularly popular in automotive applications, including the research and development of energy storage and recycling systems.

    High Power DC Input

    Application Software 

    BatSim - Battery Simulation Software

    Battery Emulation

    BatSim provides a convenient method for LAB‑GSS modules to emulate different sized battery stacks, replacing bulky and expensive systems. Nearly all relevant electrical characteristics are programmable, including number of cells, energy capacity, cut off limits, chemistry type and nominal voltage.

    Replacing the battery pack in this way allows battery powered devices - such as electric drives - to be tested in a controlled and repeatable environment.

    BatControl - Electric Drive and Battery Cycling


    Drive cycle tests can be implemented using BatControl. Previous data obtained from a test track can be imported and recreated, allowing the LAB‑GSS to simulate a real world driving test inside a laboratory environment.

    BatControl is also able to perform cycling tests on battery packs. A variety of performance issues can be investigated including lifetime tests, system degradation analysis, shot and burst overload tests and the effects of different user behaviour on performance.

    CapSim - Capacitor Simulator

    Capacitor Simulation

    CapSim accurately simulates the behaviour of most common types of capacitors, such as Electrical Double-Layer Capacitors (EDLCs). Various electrical characteristics can be simulated including transient characteristics of the capacitor stack, number of cells in series/parallel, internal resistance and state of charge.

    Using a simulator instead of a real capacitor in a test set-up helps eliminate variables that lead to unrepresentative results. Human errors, degradation of the capacitor over time and internal temperature of the capacitor can all be controlled.

    ETPS Ltd
    Unit 14, The Bridge
    Beresford Way
    Chesterfield, S41 9FG
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