“Developers of automotive traction inverters are increasingly using three-phase power modules such as Hybridpack Drive from Infineon, Acepak Drive from ST Microelectronics, SSDC from ON Semi, and others such as Starpower and CRRC,” according to LEM. “The current sensor offers current measuring ranges from 700A to 1200A and, compared to existing units in the HAH3DR family, the package isolation characteristics have been upgraded to cope with the challenge of 800V.”
The sensors slide over the output terminals of the module (see diagram). The new parts, dubbed HAH3DR S07/SP42, have enlarged apertures compared with previous models to accommodate busbars up to 1.5mm thick – in the part number, S07 indicates compatibility with Hybridpack Drive modules and their like, and SP42 indicates compatibility long busbar 800V modules.
They are “backwards compatible with the first generation HAH3DR S07/SP4 for 400V inverters, meaning no design changes are needed to use the new device”, said LEM.
Its bus bar openings are 14.5 x 2.2mm on a 47mm pitch, insulation is 3.5kV and creepage is 5.7mm (PLC0) – the earlier S07/SP4 parts mentioned above are 5.2mm PLC3 with 1.5mm slots.
The open-loop Hall sensors are designed for use in inverters with ISO 26262 ASIL D safety, and are factory calibrated over temperature and predicted lifetime, said the company, adding: “This makes them ideal for companies developing small passenger vehicle platforms, trucks and buses while restrained by limited R&D resources.”
LEM had not released further technical information at the time of writing.
