High-spec bidirectional power supply from MDL simplifies EV powertrain testing

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Bench testing of automotive EV power electronics poses a unique set of challenges, not least the need for fast responding, high-output power supplies to mimic vehicle battery systems. UK-based MDL Technologies says that its new Chroma 62000D series of bidirectional DC power supplies are ideal for such applications.

The devices enable two-quadrant operation with both a programmable DC output and regenerative DC loading within a single unit. High-power components that can be tested include bidirectional onboard chargers (BOBC), bidirectional DC converters and DC-AC motor drives, and power conversion simulation tests of batteries can be carried out in both directions.

Compliant with LV123 and LV148 standards for EV component testing, the company states that the 62000D has a very fast cross-quadrant bandwidth, which results in a rapid transient response time – as short as 1.5ms or less. In the device’s constant power mode, wide range of voltage and current combinations can be used, and constant current and constant voltage modes are also available.

Across the 62000D range, maximum power is from 6kW to 18kW, with an industry-leading power density of 18kW within a 3U rack height. Output current ratings are up to +/-540A, with voltage ratings up to 1,800V DC. When greater power is required, master/slave capability enables up to 10 of the units to operate in parallel to deliver up to 180kW.

An intuitive touchscreen display enables settings and measurement changes, as well as displaying output and program data. The units have a wide range of interface options including USB, LAN and CANbus. MDL Technologies suggests the new PSUs could also be used in the development of motors as well as battery and fuel cell systems.

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