Passive devices for automobiles are different from ordinary civilian products and have always required high reliability and can withstand the harsh environment such as high temperature, vibration and impact. In particular, problems with passive components of the drive control system are likely to cause major accidents with serious consequences. In order to prevent the occurrence of defects in the control system, when producing passive devices, special quality management is thoroughly implemented in the automobile-specific process production line.
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In the past, in the framework of the vehicle, if it was used in a car, all parts were required to have high reliability, and materials and structures were all used for special items.
However, it is also used in automobiles, and the parts used are different, and the requirements for parts are not the same. Therefore, recently, according to the use environment of different requirements, the most suitable parts are selected in a more detailed manner, and the total cost is also reduced.
For example, when using the drive system such as the engine, power transmission, and exhaust, it is necessary to use the vehicle reliability to reach a component that can correspond to 125 to 175 degrees. Car navigation, car audio and video, ETC system used in the interior of the car, you can also use the general civilian passive device with a temperature range below 105 degrees.
Regarding the use of passive devices in a high-temperature environment, not only materials that are resistant to high temperatures are selected in terms of materials, but also damage to the devices (cracks, etc.) due to stress generated by thermal expansion of various materials is required. The larger the shape of the part, the greater the stress that occurs, so it is necessary to work hard to reduce the stress during thermal shock.
For example: SMD Power Inductor In order to reduce the expansion stress of the substrate, the terminal structure of the stress release (Stress Release) structure with less stress is used without relying on the adhesive.
In addition, the main materials that make up the inductor, the magnetic body, the coil and the terminal, and the auxiliary materials such as the resin base and the adhesive having a large difference in thermal expansion coefficient are used as little or as little as possible, not only in the stress of the substrate. Also, efforts are made to suppress the internal stress of the product.
In recent years, in the process of continuously responding to environmental protection, saving fuel costs and safety of automobiles, testing tire pressure system (TPMS), keyless entry system (RKE), and automobile immobilization system (Immobilizer) are increasingly used for receiving. Radio wave antenna coil (Transponder Coil) In addition, ECU and airbag, HEV inverter control, ECB, HID leveling, EPS boost, HID with AFS function, car camera, and vehicle control are imported. With the new communication control system, electronic devices are constantly entering, and the electronic process of automobiles is getting faster and faster. As the number of in-vehicle devices used increases, including noise countermeasure components, the demand for passive coil products will continue to expand.
The use of in-vehicle electronic devices is increasing, and because the interior space must be ensured to the utmost extent, various electronic devices will be moved from the inside of the vehicle to the outside of the vehicle, and in particular, in a more hostile environment such as an engine.
The interior of the engine is not only the former ECU, but also many other parts, the space in the engine room is even more insufficient. In particular, the demand for a DCDC converter that converts battery voltage to various necessary voltages is increased, and the installation space is smaller, and therefore, miniaturization of components is required.
Increasing the switching frequency is very effective for miniaturizing the DCDC converter. Since the switching frequency is increased, even if the same current value is used, the inductance of the power supply inductance can be reduced, and the size can be reduced.
In the past, DCDC converters for vehicles generally used a relatively low-power drive of less than 100 kHz, but recently, for miniaturization, the switching frequency used in consumer electronic equipment has risen rapidly. The winding-type power supply inductor is miniaturized and converted to SMD.
The coil of the looped coil is basically wound by hand, and the operating staff is different and the difference is very large. However, due to the SMD, the automatic winding is not only miniaturized, but also improves the stability of quality.
On the other hand, most of the cars have AM radio. Considering the influence of radio noise, the switching frequency of the DCDC converter needs to avoid the AM radio frequency band (AM to FM band 540 ~ 1620 kHz).
Therefore, to increase the switching frequency to above 500 kHz, it is necessary to set the frequency band above 1.6 MHz at once, but it is difficult to see the current situation. This is a difficulty in miniaturizing the converter.
In addition, the power supply inductance is accompanied by heat. When used at high temperatures, there is an upper limit for the applicable temperature, and it is also subject to self-heating.
That is to say, the ambient temperature is room temperature to 65 ° C, and the civil temperature can be increased by 40 ° C. When used in a high temperature environment, the space for allowing the temperature to rise is small, which may cause the current to pass less than the current of the civilian product.
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