Loss of automobile control inductor by Panasonic halves

Panasonic has unveiled a new “PCC-M1280MS” product for in-vehicle control inductors ( news release ). The business calls it a “power choke coil.” The power loss has been minimized to 1.5W for the current model, which is half that of the traditional product of the firm. In the other hand, the resistance voltage has been raised to + 125V, which is around twice that of the normal products of the firm. The outside dimensions are 12.5 mm x 12.5 mm x 8.0 mm and the value of the inductance is 40 μH (value at 100 kHz). The nominal current is as high as 5.9A.

It is intended for the ECU (Electronic Control Unit) step-up DC-DC converter circuit installed in petrol cars, diesel cars, electric vehicles, etc. “Currently, environmental regulations are being tightened, and automobile engines are required to comply with stricter emission regulations. Specifically, fuel is directly injected into the cylinder of the engine at high pressure. High-pressure injection of the direct-injection injection method and multi-stage injection have become commonplace, and along with this, the booster circuit that drives the injector is required to have a large capacity and shorten the boost recovery time.

The power supply inductor used in the booster circuit needs to have low loss and high electric resistance at the same time. “Environmental regulations are now being tightened, and automotive engines are required to comply with stricter emission regulations. In particular, at high pressure, fuel is directly injected into the engine cylinder. The direct-injection method of high-pressure injection and multi-stage injection have become commonplace, and along with this, the bo bo (metal-based composite magnetic material).

According to the agency, “the power loss of the developed metal composite material is the smallest in the industry.”

We have also increased the miniaturization and vibration tolerance for the new product by devising the molding process. While the details of the molding mechanism have not been disclosed, it is said that it has been possible to mold the magnetic material around the coil uniformly. As a result, relative to the traditional goods of the company, the value was decreased by 40 percent. “Contributing to space saving of ECU” (the company).

In addition to devising the molding process and reducing the height of the terminal lead-out position from the coil to 1/2 of the traditional height, the enhancement of vibration tolerance was realized by enhancing the coil structure. It can endure up to 30g vibrations (g is gravitational acceleration). High vibration resistance was achieved by shifting the terminal lead-out location closer to the printed circuit board.

As a result, the work of using a bonding agent in the ECU’s mounting process to improve the vibration resistance became futile and the mounting process was finished. It is important to simplify (the company).