Domestic environmental protection regulations have become increasingly stringent on vehicle emission requirements, and users have begun to choose new energy vehicles as a means of transportation. According to statistics from the China Automobile Association, the cumulative production and sales of domestic new energy vehicles (including pure electric and plug-in hybrid vehicles) in the first half of 2018 were 413,000 and 412,000, respectively, with sales increasing by 111.5% over the same period of the previous year. Among them, the sales of pure electric vehicles were 313,000 units, a year-on-year increase of 96.0%; the sales of plug-in hybrid vehicles were 99,000 units, a year-on-year increase of 181.6%.
However, the battery life and safety of new energy vehicles have always been hot topics in the industry. Regarding battery life, automakers are seeking to expand battery capacity while also making continuous efforts to save energy, such as starting with miniaturization and light weight. At today's "2018 Beijing International Automobile Manufacturing and Industrial Assembly Expo", ROHM took the concept of "contributing to the future of automobiles with semiconductors" and brought new energy vehicles, automobile miniaturization and weight reduction, autonomous driving, Related leading semiconductor products such as human-computer interaction.
"Full SiC" power modules help cars achieve lightweightEveryone knows that people who are lighter will exercise more quickly and feel less weight-bearing. The same goes for cars. ROHM’s strength lies in the SiC material. Compared with traditional Si power components, SiC power components can greatly reduce losses, as can be seen through its sponsorship of the Formula E products for the all-electric drive car race. In the fourth season, a transistor and diode "full SiC" power module was provided. Compared with the inverter in the second season without SiC, the volume was reduced by 43% and the weight was reduced by 6kg.
The "full SiC" power module mounted on the inverter adopts the unique internal structure of the module developed by ROHM and a new package with optimized heat dissipation design, successfully increasing the rated current. In addition, compared with ordinary IGBT modules with the same rated current, the switching loss is reduced by up to 75% (when the chip temperature is 150°C), which will greatly contribute to the energy saving of the application. Not only that, high-frequency driving can not only achieve the miniaturization of peripheral components, but also the effect of reducing switching loss during high-frequency driving is more significant, so it also contributes to the miniaturization of cooling systems, etc.
Car display screens need a safer, realistic solutionNow automobile dashboards have begun to replace machine dashboards with electronic dashboards, which not only look beautiful, but also display more accurate displays. However, for electronic dashboards, if there is an emergency power failure, a black screen will appear and users will enter a state where they cannot be controlled. This situation is extremely dangerous. The panel chipset developed by ROHM for driving and controlling automotive LCD panels is expected to solve this problem.
The chipset for automotive high-definition LCD panels is composed of gate drivers, source drivers, and timing controllers (T-CON) that can drive the industry's highest-level HD/FHD-level high-definition LCD panels, and make these devices in the best operating state Power management IC (PMIC) and gamma correction IC. By sharing information between these ICs at any time, functional safety has been successfully introduced in the components for LCD panels for the first time in the world. As shown in the figure above, once a malfunction occurs, the LCD screen is not in a black screen state, but continues to display the status of various parts of the car, so that the owner can avoid panic.
Completely silver-free high-brightness red LED: prevent car brake lights from vulcanizingAutomobile brake lights tend to turn black with longer use time. This is due to the vulcanization of the internal metal material silver, so the anti-vulcanization can effectively extend the service life of the brake lights. In response to this problem, ROHM uses the advantages of a vertical integrated production system from components to packaging. The chip bonding uses AuSu, the lead wire uses gold, and the frame uses gold palladium (AuPd) to achieve complete silver-free. This eliminates the LED brightness degradation caused by corrosion of silver, which can improve the reliability of the application.
In the vulcanization test, the luminous flux of the products using the silver-plated frame and silver paste in the past was 70% after one cycle (24 hours) and 60% after 10 cycles. The longer the time, the lower the luminous flux; while the new products can After 10 cycles (240 hours), it still maintains almost 100% high luminous flux.
Car operational amplifier with stronger anti-noise interference abilityWith the increasing acceleration of the electronic and high-density of automobiles, the noise problem is becoming more and more serious, and tiny signals are extremely susceptible to interference. Especially when a car is running, if the motor is disturbed and stops running, the consequences will be disastrous. Therefore, manufacturers are trying their best to seek anti-jamming products to ensure the stability of car operation. In response to noise problems, ROHM makes full use of its analog design technology and unique bipolar process and other integrated production advantages to create the world's first operational amplifier "BA8290xYxx-C series" that does not require anti-noise design circuits.
In the demonstration, ROHM compared the "BA8290xYxx-C series" with the previous generation product. When the walkie-talkie is close to the system using the previous generation product, the motor will stop rotating; when the walkie-talkie is close to the system using the "BA8290xYxx-C series" product At this time, the rotation of the motor will hardly be affected.
The on-site engineer explained that the "BA8290xYxx-C series" was developed by integrating ROHM's "circuit design", "layout" and "process" three analog technologies. Compared with general products, the output voltage of all frequency bands varies by ±3.5% ～±10%, this product is only within ±1%, the anti-noise performance has an absolute advantage. Deployed in the back stage of components that output small signals such as sensors, it can amplify signals without being affected by noise. Therefore, the noise design that used filters as countermeasures in the past is no longer needed, which helps reduce system design man-hours and improve reliability.
In addition to the above "full SiC" power modules, silver-free high-brightness red LEDs, anti-interference automotive operational amplifiers and chipsets for automotive high-definition LCD panels, ROHM also brings its ultra-high-speed pulse control technology.
Although these products have improved the battery life and safety of new energy vehicles, there is still a long way to go in pursuit of more precision and safety. Especially in the future, autonomous vehicles will have more stringent requirements on components and chip manufacturers. We must continue to make efforts in new technology research and development and product performance improvement.
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