The revolutionary transformation and solutions in automotive electrification

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In recent years, the automotive industry has undergone a revolutionary transformation due to the rapid development of vehicle electrification. With advancements in technology and an increasing environmental consciousness, there is a growing focus from automotive manufacturers and consumers on researching, developing, and implementing electric vehicles (EVs) and electrification technologies. This shift not only presents challenges to traditional internal combustion engine vehicles but also signifies a new competitive landscape in the automotive sector. Within this context, understanding the trends in vehicle electrification development has become a crucial and inevitable topic. This article aims to explore the application requirements of vehicle electrification and discuss the related solutions offered by Murata in this evolving field.

The electrification of automobiles is driving the growth in demand for electronic components

As vehicles become more electrified, the demand for electronic components is expected to increase significantly. Technological innovation, particularly in battery technology, has led to significant improvements in the range and charging speed of electric vehicles. Vehicles are also becoming smarter and more connected, incorporating technologies like vehicle-to-everything (V2X) communication and autonomous driving to enhance driving safety and user experience.

Market demand is also on the rise due to growing environmental awareness and energy conservation efforts. Consumers are increasingly opting for electric and environmentally friendly vehicles, thus driving the application and market penetration of electrification technologies. Moreover, various countries have introduced government support policies and subsidy measures to incentivize the development of electric vehicles, further propelling the growth of the automotive electrification industry.

Murata foresees a surge in demand for high-performance automotive components, prompting continuous product development with a focus on enhanced reliability. By ensuring normal operation at high temperatures and bolstering safety features, Murata contributes to the stable functioning of power electronics systems under heavy loads.

Murata's dedication lies in designing and manufacturing components that empower engineers to pioneer the next wave of transportation applications. The ongoing need for innovative electronic products supports emerging mobile technologies such as electric vehicles (EVs), advanced driver assistance systems (ADAS), infotainment systems, and Mobility-as-a-Service (MaaS).

The array of products for automotive applications is diverse, encompassing inverters, BMS (Battery Management Systems), OBC (On Board Chargers), DC-DC converters, engine ECUs for vehicle electrification, as well as TCU (Telematics Control Unit) and IVI (In Vehicle Infotainment) for vehicle connectivity. Additionally, products for automotive AD/ADAS (Advanced Driver Assistance Systems), such as ADAS, APA (Automated Parking Assistance), LiDAR, radar, and sensing cameras, as well as automotive lighting, EPS (Electric Power Steering), PKE (Passive Keyless Entry)/TPMS (Tire Pressure Monitoring Systems), gateways/In-vehicle LAN, and others for vehicle body/chassis/safety.

Murata’s provides comprehensive range of solutions tailored specifically for automotive electrification applications. Below I will introduce some key functional features of relevant products offered by Murata. 

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High-temperature film capacitors and NTC thermistors meet automotive requirements

Firstly, Murata has introduced high-temperature film capacitors, which are capacitors that use plastic polymer film as the dielectric material. They feature good frequency and temperature characteristics, no DC bias, and high insulation resistance. In recent years, the commonly used type is the metallized film capacitor, where internal electrodes are vapor-deposited onto the film.

Film capacitors can be classified based on the structure and type of dielectric material. The structure of film capacitors can generally be divided into two types: "winded" and "layered." The winded type involves winding and stamping polymer films, which are then inserted into a case. The layered type involves stacking multiple layers of polymer films, which are then inserted into a case. Currently, the winded type is more commonly used due to ease of manufacturing.

Film capacitors use various polymer materials such as PP, PET, PEN, and PPS as dielectric materials. The characteristics of film capacitors vary significantly depending on the type of dielectric material used, and their applications also differ. For example, PP film capacitors have good self-healing properties and high reliability, making them widely used in automotive and industrial equipment applications.

Currently, the operating temperature of PP film capacitors commonly used in automotive and industrial applications can generally ensure operation up to 105°C. Additionally, Murata's FH series uses high-temperature-resistant film with a high dielectric constant, allowing continuous operation at 125°C. These capacitors also feature self-healing capabilities in high-temperature environments, enabling miniaturization compared to previous PP film capacitors. The target applications of the FH series include smooth capacitors for hybrid and electric vehicles that require high temperature resistance and reliability, as well as industrial equipment.

On the other hand, NTC (Negative Temperature Coefficient) thermistors are thermally sensitive resistors named after their characteristic of decreasing resistance with increasing temperature. They are commonly used as temperature sensors in various applications such as temperature indicators in air conditioners, temperature control devices in smartphones, kettles, and irons, as well as current control devices in power equipment. With the increasing electrification of vehicles, NTC thermistors are increasingly used in automotive products.

Murata began mass-producing NTC thermistors around 1984 and currently offers a lineup mainly consisting of chip-based products. Murata's NCU series NTC thermistors are SMD chip-type temperature sensors used for temperature detection. They have high reliability and are suitable for the automotive market with high reliability requirements, offering temperature detection and compensation functions over a wide temperature range.

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Common mode chokes coils for automotive signal and power transmission applications.

In the automotive environment, which is characterized by high noise levels, effective noise filtering is crucial. Murata has introduced common mode chokes coils (CMCC) for application in EMI suppression filters (EMC and noise suppression). Common mode chokes coils are filters designed to reduce common mode noise that becomes problematic in differential transmission lines (commonly used in USB/HDMI/MIPI, as well as in automotive CAN/CAN-FD/100Base-T1/1000Base-T1/SerDes/A2B®), power lines, and audio lines. Common mode chokes coils do not affect the signal (with a high cut-off frequency) and are very suited for eliminating common mode noise in the frequency range of several MHz to several hundred MHz.

Common mode chokes coils offer two advantages: even if the frequency of the signal and noise overlap, as long as the conduction mode is different, the noise can be eliminated. Additionally, even with high differential currents, magnetic core saturation, which can degrade performance, does not occur.

For automotive applications, Murata offers various common mode chokes coils suitable for different signal lines. For USB, HDMI, LVDS, and other signal lines in multimedia entertainment systems, the compact and low-profile multilayer type DLM11SN_HZ2 can be used, which has no impact on the signal waveform of high-speed differential signal lines and provides noise reduction. The winding type DLW21SZ_HQ2 operates in a wide temperature range (-40 to 105°C) and has a very high self-resonance frequency, allowing for a higher cut-off frequency and excellent high-speed signal transmission characteristics. The DLW21SZ_XQ2 offers high common mode impedance, excellent noise reduction, no impact on the signal waveform of high-speed differential signal lines, and provides noise reduction.

For safety applications, the winding type DLW21SH_HQ2 operates in a temperature range of -40 to 125°C, with a very high self-resonance frequency, enabling a higher cut-off frequency and excellent high-speed signal transmission characteristics. The DLW31SH_SQ2 achieves high impedance in the high-frequency band, excellent noise reduction across a wide frequency band, and is suitable for use in automotive applications within the specified temperature range. Additionally, Murata offers various common mode chokes coils for CAN/FlexRay applications, in-vehicle Ethernet, and power line applications.

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High-quality automotive-grade crystal units and power inductors

Murata also offers automotive-grade crystal resonators (XRCGB series, XRCGE series) with Murata's unique packaging technology, providing excellent quality, mass production capabilities, and cost-effectiveness. These crystal resonators are designed to meet the next-generation automotive communication standards for in-vehicle Ethernet PHY with product specifications that can meet customer requirements. They feature load capacity (Cs) options of 6pF, 8pF, 10pF, etc. Additionally, products rated for +125°C / +150°C have been added to the product lineup.

Murata's automotive-grade crystal resonators meet the reliability requirements for automotive use (AEC-Q200) and undergo various tests, including 1000 hours of high-temperature exposure at +125°C, 1000 temperature cycles from -55°C to +125°C, 1000 hours of biased humidity load at +85°C, 85% RH, DC6V, and 1000 hours of high-temperature load at +125°C, DC6V.

These crystal resonators feature compact, high-reliability packaging suitable for downsizing of ECUs, with dimensions of 2.0×1.6mm. Compared to the 3.2×2.5mm size, they achieve a remarkable 60% reduction in size. They utilize CERALOCK technology for high-reliability packaging, offering excellent mechanical and climate resistance properties such as shock resistance.

Murata's proprietary particle screening technology accurately identifies defective products with particles that may cause deterioration of crystal resonator characteristics during production. The shape design is suitable for AOI (Automatic Optical Inspection) and features small-sized corner electrodes that enhance solder fillets visibility.

Murata also offers power inductors compliant with ISO16750-3 (vibration test for engine), recommended for automotive powertrains and safety devices, including MDH10060C-100MB# and MDH10060C-101MB#. These power inductors have dimensions of 10.1±0.3mm (length), 10.0±0.3mm (width), and 6.0±0.3mm (height), supporting an inductance of 10μH±20% at a measurement frequency of 0.1MHz, with an operating temperature range (including self-temperature rise) of -55°C to 150°C. They feature shielded ferrite magnetic cores.

For MDH10060C-100MB#, the rated current for inductance change (Isat) is 4.8A (maximum) / 6A (typical), and the rated current for temperature rise (Itemp) is 3.4A (maximum) / 5.2A (typical), with a maximum DC resistance of 0.0247Ω and a DC resistance of 0.019Ω±30%.

For MDH10060C-101MB#, the rated current for inductance change (Isat) is 1.5A (maximum) / 1.9A (typical), and the rated current for temperature rise (Itemp) is 1.2A (maximum) / 1.8A (typical), with a maximum DC resistance of 0.208Ω and a DC resistance of 0.160Ω±30%.

Conclusion

The trend of automotive electrification is set to continue evolving across various fronts, including technological innovation, market demand, and policy support. This evolution presents both opportunities and challenges for the future of the automotive industry. In response to this shift towards automotive electrification, Murata has introduced a range of solutions aimed at accelerating the development speed and enhancing the design flexibility of automotive-related products. With a diverse portfolio of products, Murata's solutions play a significant role in meeting the dynamic needs of the automotive sector.

Due to space constraints, this article covers only a selection of related products offered by Murata. For more information on Murata's automotive-related product solutions, please reach out to Murata or Arrow for further details and assistance.

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