Small Power Inductor of 4 mm by 4 mm Square for Automotive Use
As the computerization of cars advances, ECUs are now incorporated in several cars. ADAS and autonomous driving require a number of ECUs capable of highly efficient control over cars, with such ECUs requiring small and high-performance power inductor free from connection failures.
The company has commercialized a small power inductor of 4 mm by 4 mm square for automotive use. It is manufactured with a molding technology where the coil is completely filled with a melted metal composite material, and is highly resistant to vibrations, thereby preventing crack formation. Further, its leads have a redundant design that improves the connection reliability of the coil.
What is small power inductor of 4 mm by 4 mm square for automotive use?
Three features of small power inductor of 4 mm
by 4 mm square for automotive use
*1: Cleanliness is measured in accordance with VDA19.1: technical cleanliness inspection and ISO16232: cleanliness measurement standards, etc.
1. Suppress the bias of magnetic material density to prevent the formation of cracks inside the product.
By utilizing its unique metal magnetic material, the company has newly developed a metal composite material for insulating magnetic powder and sealing the metal magnetic material. This enabls uniform density of the metal magnetic material which is required for compact-sizing, and brought power inductor that suppresses crack formation in the product.
[Challenge to compact-sizing]
(Metal composite material image)
2. A joint with a redundant design between a built-in coil and a terminal improves the connection reliability.
・Structure for suppressing connection defects by applying redundant design that has multiple connections to the lead.
・Improved connection reliability of the lead by applying "caulking" structure to the lead terminal.
3. CO2 emissions during the manufacturing process are 50% less than in conventional cases (CO2 emissions/piece)
Due to its smaller size than conventional ones, the product requires finer processing and assembly, resulting in a problem whereby the conventional manufacturing process needs a greater amount of power to manufacture the product. To deal with this problem, Panasonic has changed the processing method by reducing heat treatments, thereby allowing simultaneous microfabrication and high-speed processing. This has led to a significant improvement in the productivity of the production process. As a result, CO2 emissions during the manufacturing process are now 50% less than in conventional cases (CO2 emissions/unit).
Metal composite material
for a 4 mm by 4 mm square coil (image)
[Sensor system application for supporting ADAS/AD]
Circuit example Above application Voltage-down DC-DC converter
Rated current (*2)
4.45 x 4.06 x 2.0
(*1): Measured at 100 kHz. (*2): Current value that causes a temperature rise of 40°C
The company is planning to expand the inductance range of the coil
to meet market needs.