Bidirectional regenerative supply simplifies EV test

September 16, 2020 // By Nick Flaherty
Bidirectional regenerative supply simplifies EV test
A compact auto-ranging DC supply from Intepro Systems provides up to 30KW with energy-recovering DC load

Intepro Systems has launched a series of programmable bidirectional digital power supplies/loads.

The PSB series are microprocessor controlled bi-directional supplies that feature two devices in one: an auto-ranging DC power supply and an electronic DC load with energy recovery. The bi-directional package replaces individual programmable sources and loads, and the regenerative load returns up to 95 percent of test energy to the grid.

The series enables two-quadrant operation in a single, efficient, and easy-to-use instrument eliminating the need for two topologies. Combining the features of a programmable source and regenerative programmable load into one chassis frees up rack space, reduces weight and cost, and reduces generated heat while recovering load energy back to the grid.

Bidirectional DC-DC converters (BDCs) are becoming increasingly popular due to the growing need for systems to have the capability of bidirectional energy transfer between two DC buses. In addition to traditional applications in DC motor drives, new applications for BDCs include energy storage in renewable energy systems, fuel cell energy systems, hybrid electric vehicles (HEV) and uninterruptible power supplies (UPS).

The PSB power supplies are available with outputs of 15KW in a 3U x 19” rack chassis (PSB 9000) and 30KW in 4U (PSB 1000), and they may be connected in parallel for operation up to 2MW. The auto-ranging bidirectional output stage maintains full power over a wide output range while bidirectional operation provides seamless transitions between source and sink modes.

The unique capability of the Intepro PSB series is the ability to be programmed to seamlessly switch between source and sink with no “off” time. When operating as the load the device synchronizes with its 3-phase power input to recover upwards of 95% of the energy. When operating as a source, the unit has an efficiency of up to 93%, generating less heat in both modes. This provides further energy savings by reducing the cooling costs in the test environment

The PSB series features a wide

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