Surface mount power choke coil is ready for harsh conditions

Compact, surface mount inductors that are capable of passing large currents have been developed by Panasonic Industry and released as the ETQPAMR33JFW surface mount power choke coils.

The electrification of automotive engineering means more electronic devices, electric motors, inverter systems and electronic control units (ECUs) are to be integrated in cars, reducing available mounting space without reducing the requirement to handle high currents.

Panasonic Industry identified the trend towards surface mount devices and the fact that conventional through hole mounting (THD) inductors are too large to contribute to a significant overall downsizing. The company introduced the ETQPAMR33JFW automotive power inductor which is half the size of a conventional ferrite type. The surface mount power choke coil is able to handle high currents under harsh automotive conditions. It can be operated under temperatures up to 160 degrees C including self heating and shows stable behaviour at several hours up to 180 degrees C. Its low loss characteristics ensure a high ECU efficiency and contribute to simplify the overall thermal design process, added Panasonic Industry.

The metal composite material outperforms the ferrite technology; with the coil heat generation reduced while the coil heat dissipation is increased. A large current of 83A rated and 103A saturation current are achieved while significantly reducing the coil’s volume, claimed Panasonic Industry.

The inductor enables ECUs to be directly mounted on engines by ensuring not only “an excellent heat resistance”, but also an “outstanding vibration robustness”, delivering a performance of 5Hz to 2kHz / 30G due to its integral structure by direct leading wire and caulking structure with a core body.

“Osamu Bessho from Panasonic Industry Europe, believed the ETQP could be a blueprint for automotive inductor technology, delivering downsizing, reliability and efficiency for next-generation car electrification, he commented.

“From powertrain, brake or steering circuitry noise filters, boost converters, buck converters or ADAS. . . [the] power choke coils are ready to overcome THD systems and pave the way for modern and miniaturised SMD-only automotive circuitry,” he said.

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