For electric cars the 300 to 400-volt range has established itself as the standard, BRUSA notes. With advances in semiconductor technology, a doubling of operating voltage is unproblematic.

While the doubling of the voltage to 750 volts offers advantages, it is a challenge to control the increased electric fields. To achieve optimal electromagnetic compatibility, BRUSA Elektronik AG developed the resonant SoftSwing topology which is already used in its 400-volt components.

This proven soft commutation minimizes switching loss while ensuring optimal efficiency and EMC values are achieved. This technology is particularly advantageous at high voltages and will improve efficiency, weight, size and therefore reduce the costs of the total system, according to the company.

Products available in 750V versions include:

• HSM1-10.18.13-HV. The 750V version of the ten-pole hybrid synchronous motor now delivers a maximum voltage of 142 kW and a maximum torque of 315 N·m (232 lb-ft). Minimizing the proportion of permanent magnets ensures a high level of inherent safety. For optimal performance, BRUSA suggests using the drive together with the recently developed DMC537 inverter.

• DMC517. The DMC517 is an ultra-compact, universal inverter which can be used to drive different motor types up to around 50 kW. An ISU option is offered for integration in accordance with ISO26262 (ASIL-C).

• DMC527. The DMC527 is a compact, universal inverter which can be used to drive different motor types up to around 100 kW. An ISU option is offered for integration in accordance with ISO26262 (ASIL-C).

• DMC537. The DMC537 is a compact, universal inverter which can be used to drive different motor types up to around 150 kW. An ISU option is offered for integration in accordance with ISO26262 (ASIL-C). This inverter is suited for use with the recently developed HSM1-10.18.13-HV drive.

• DMC547. The DMC547 is a universal high-performance inverter which can be used to drive different motor types up to around 200 kW. An ISU option is offered for integration in accordance with ISO26262 (ASIL-C).

• BDC546. This bidirectional DC/DC converter was designed primarily for fuel-cell applications, functioning as the link between the fuel cells, HV battery and drive. With its wide voltage range, the BDC546 is suited for use in high-voltage drive applications such as in fuel-cell busses. As a powerful DC fast charger, the BDC546 can also be used in test-bench applications or in combination with stationary transformers.

• BSC618-24V. The BSC6 is the link between the HV side (e.g. fuel cells and traction battery) and the LV side (24V system). With a maximum output of 3.5 kW, this converter can completely replace additional generators and even 24V batteries depending on the application.

• BSC628-12V. The BSC6 is the link between the HV side (e.g. fuel cells and traction battery) and the LV side (12V system). With a maximum output of 3.5 kW, this converter can completely replace additional generators and even 12V batteries depending on the application.

• EVB1-660-40 750V. The liquid-cooled high performance 26.6 kWh battery is designed specifically for high-performance applications. It delivers a discharge current of up to 400 amps and can be charged at a current of up to 200 amps.

• NLG514. The 3.7 kW charger is based on the proven NLG5 chargers and features extensive safety functions. The new 720V version is also available as an air-cooled and water-cooled version.

• NLG667. The world’s first 22kW on-board fast charger is now available in a 750V version. The liquid-cooled fast charger features a unique power density without lacking any technical highlights (e.g. ISO15118, PLC) or extensive safety functions (e.g. galvanic isolation).

• PDU274. This high-voltage distributor is specially designed for use with BRUSA system components. Safety functions such as interlock monitoring ensure the 750V system operates safely.