3kW bi-directional DC-DC converter for electric vehicles

April 17, 2020 //By Nick Flaherty
The 3kW BCA DC-DC converter from Murata subsidiary Calex Manufacturing has an efficiency of up to 97 per cent
The 3kW BCA DC-DC converter from Murata subsidiary Calex Manufacturing has an efficiency of up to 97 per cent

Calex Manufacturing in the US has launched a 3kW bi-directional non-isolated DC-DC converter with an efficiency of 97 per cent for automotive and battery applications.

The BCA (48S12.3K0BCA) weighs 1.3kg and measures 220 x 156 x 25mm (8.67 x 6.14 x 1.01in).  The packaging and thermal design makes the converter suitable for harsh shock and vibration requirements, as well as easy integration with a battery pack.

Standard Hybrid Electric Vehicle architectures typically use two independent batteries at different voltages, so the BCA charges a low side (12V) battery during normal operation (buck mode) and charges or assists the high voltage (48V) battery in emergency situations (boost mode). In the event that the 48V battery requires charging while in the boost mode, the unit enters into pre-charge mode.

The BCA's features include a disconnect switch based on a back to-back MOSFET configuration for the low side 12V battery, reverse voltage protection, short circuit protection, as well as low standby current for the low side. The baseplate of the enclosure allows for ease of mounting to a chill plate or chassis. The operational baseplate temperature range of the BCA is -40˚C to 100˚C. 

The BCA uses a Controller Area Network (CAN) 2.0B interface for complete control of the converter, as well as monitoring the LS current and the internal temperature. Additionally, the BCA uses a high speed CAN-Transceiver for communication with the microcontroller.

"The BCA provides a complete solution for in-vehicle power distribution in 48V/12V battery configurations, making this an outstanding choice for OEM vehicle electrical systems," said Michael McNally, director of product marketing at Calex Manufacturing, a California-based subsidiary of Murata Power Solutions.

www.calex.com

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