In the green wave sweeping China's auto industry, ADI, the world's leading high-performance analog chip manufacturer, is based on long-term experience in automotive electrification, providing solutions that provide lower emissions, higher efficiency, higher reliability and safety. Keeping battery management, powertrain, and infotainment systems high, while becoming smaller, lighter, and more reliable, driving a more environmentally-friendly future car early in the morning.
Monitoring + Isolation: Two Protectors of Battery Safety Management
Because of its high energy density, the power battery has become the main source of power for new energy vehicles, accounting for a higher proportion of vehicle costs, and up to 40% in pure electric vehicles. It is one of the key technologies of the “three powers” of new energy vehicles. BMS (Battery Management System) technology starts and stops the battery cooling system through thermal management of the power battery, manages the balance between the single cells, prevents the over-charge and over-discharge of the single cells, and monitors the health of the overall battery. Improving battery pack efficiency, extending life and ensuring safety has become an important design consideration for new energy vehicles to increase their mileage and reduce vehicle costs.
Due to the excellent electrical and power characteristics of lithium batteries in the field of hybrid and pure electric vehicles, lithium battery solutions are currently widely used in the automotive industry. The power lithium-ion battery pack contains a large number of battery cells with high operating voltage and current. It must be properly monitored and isolated from strong and weak electrical signals to improve battery efficiency, extend battery life, and ensure battery pack safety.
LT's fourth-generation lithium battery main monitoring IC product LTC6811, capable of monitoring the voltage and temperature of 12 channels (more flexible channels in the future), with a limit accuracy of better than 1.2 mV; daisy-chain connection; Fast conversion speed and optimal data protection; 12 channels of data can be detected in 290μs; and passive cell balancing control is provided. The digital isolators iCoupler®, optimized for automotive applications, offer the lowest power consumption at high speeds while offering the advantages of small package size and many channel options, requiring the smallest component count and board space. isoPowerTM is ADI's unique integrated power digital isolator solution that provides isolated power and multi-channel digital isolation; isoPower is less expensive and occupies than discrete DC to DC isolators plus digital isolators The area is smaller.
ADI's latest generation lithium battery BMS solution based on LTC6811, iCoupler® and isoPowerTM technology, with high-precision monitoring, maintains good performance in demanding environments, provides reliable, safe power management, and reduces system efficiency The overall cost.
48V light mixing: the transition period optimization under Yan Zheng
Increasingly, the increase in current caused by the increase in on-board electronic power is accompanied by the need for a thicker cable to provide greater current capability, thereby causing a problem of insufficient space in the interior of the vehicle and an increase in weight resulting in reduced energy efficiency. Under the double pressure of increasingly strict energy consumption and emission requirements, the 48V light-mixing system with low system cost, relatively obvious fuel-saving effect and little change to the existing vehicle structure is widely favored by the industry. The 48V and 12V systems will coexist.
The ADI bidirectional two-phase synchronous buck or boost controller, the LTC3871, brings new performance levels, control and simplification circuitry to 48V/12V dual cells by allowing the same external power components to be used for buck and boost purposes. DC/DC automotive systems; can be paralleled up to 12 phases to meet the needs of high current and high power (3KW-10KW) applications. When starting a car or requiring extra power, the LTC3871 allows two batteries to simultaneously supply power to the same load. The 48V battery will play a central role in increasing the available energy while also reducing wire harness weight and loss. This extra energy paves the way for new technology, which increases the safety and efficiency of the car while reducing its CO2 emissions.
For autonomous vehicle redundant battery system applications, ADI recently introduced the LT8708/-1, a bidirectional buck-boost switching regulator controller with up to 98% efficiency, operating with an input voltage that can be higher or lower. At or equal to the output voltage, it is ideal for two 12V, 24V or 48V batteries and 48V/12V and 48V/24V dual battery systems. The device operates from a single 2.8V to 80V input voltage range and produces an output voltage of 1.3V to 80V, delivering up to kW of power, simplifying the need to regulate VOUT, VIN, and / or bidirectional power conversion in IOUT, IIN battery/capacitor backup system.
In fact, ADI has many other innovative power solutions that are also suitable for new energy vehicle power management and powertrain design innovations such as ultra-low noise (electromagnetic interference), better active balancing and energy optimization (safe driving) Long distance), super surge and high voltage protection. These technical features enable automotive-related power systems to be energy efficient while optimizing EMC and PCB space, improving safety and reliability, and maximizing the performance and safety requirements of autonomous driving and new energy vehicle systems.
The remote control system is standard in the future of self-driving cars. From a technical point of view, compared with the rigid connection of the original undercarriage system, the layout of the wire control system is more flexible, which can reduce the difficulty of chassis design and layout, and does not need to adjust the position of other components, which is beneficial to realize the modular chassis design. For the autopilot line control solution, ADI has cooperated with the world's leading magnetoresistive suppliers to combine its own signal conditioning, interface and other analog device technologies with magnetoresistive sensors to introduce industry-leading, cost-effective and safer. The magnetoresistance scheme (xMR) for detecting speed, angle and position can be used for high-precision wire-controlled motor drive systems such as wire-controlled brakes and wire-controlled steering wheels.
Taking the popular ADI magnetoresistive sensor chip ADA4571 as an example, it can achieve direct, non-contact and wear-free angle measurement in a wide range of motor applications, including electric assisted steering, braking, active suspension, Automotive systems such as stability control. With integrated AMR and precision signal conditioning technology, the ADA4571 is immune to magnet drift caused by longevity, high temperature or mechanical stress, enabling high-precision readings in harsh environments; high-precision position feedback for improved motor switching Controls performance and improves torque and speed performance, especially in low-speed applications; more sophisticated torque control improves motor efficiency, reduces emissions and heat dissipation, and extends motor life. In particular, the ADA4571 can withstand an upper limit of magnetic field strength and achieve a high signal-to-noise ratio.
In the revolving digital converter (RDC) market, ADI also has a broad product portfolio and a long history. The AD2S1205 and AD2S1210 are capable of handling trace rates up to 3,125 RPS with an accuracy of ±2.5 arc minutes. The AD2S1205 is a 12-bit RDC and the 10/12/14/16-bit resolution of the AD2S1210 can be set by the user. The chip features differential input and incremental encoder outputs, as well as programmable fault detection thresholds. They are used for accurate measurement of motor shaft angle and speed in gearbox, EPS and HEV/EV motors.
How is motorization and intelligence perfectly combined?
With the demand for infotainment, active and passive protection, assisted driving and even automatic driving, cars are becoming more and more intelligent by integrating more and more screens, electronic devices and software systems. For practitioners, compared with traditional fuel vehicles, new energy vehicles with the “three power” system as the core are the best carriers to realize intelligence, and intelligent power flow configuration has become another core competition for new energy vehicles. force.
According to research data, the consumption of bicycle semiconductors in pure electric vehicles is as high as 719 dollars, which is more than twice that of traditional fuel vehicles. In the future, the degree of intelligence will become another core competitiveness of new energy vehicles because consumers are more perceptible. As a veteran of the automotive industry that has provided MEMS accelerometers for airbags since 1993, ADI's series of high-performance products and The experience accumulated in the industry over the years will help customers grasp the intelligent pulse and win the future.
Radar, lidar and inertial units are the key technologies for automatic driving safety. ADI's radar technology covers the full range of 24 GHz and 76-81 GHz, accounting for 50% of all radar modules developed today. In the laser radar technology with stronger ranging capability and higher resolution, ADI has acquired Vescent's investment in pure solid-state laser radar technology, aiming to promote the laser radar system automatically at the system-level optimal performance and lowest cost. Popular applications in driving. The uniquely developed ADI iSensor IMU technology portfolio offers tactical stability and ultra-low noise, providing up to ten degrees of freedom of motion, all with full factory calibration and optimized embedded sensor adjustment. ADI's IMU for vehicle application scenarios, from tactical level reduction to vehicle-level development, is the industry's strongest solution. As an important partner of Baidu Apollo, ADI's inertial measurement unit is used to make the inertial navigation of the world's first L4-class mass production autonomous bus Apolon.
Based on 28nm CMOS technology, ADI combines industry-leading millimeter-wave radar, laser radar and IMU to build a Drive360TM technology platform that reliably detects objects with smaller shapes, faster moving speeds and longer distances in autonomous vehicles. A 360-degree protective barrier is built around to protect the car and occupants in all aspects.
In the smart cockpit area, ADI also has a very rich and widely recognized product line: A2B technology that successfully cooperates with 90% of global automakers, supports active noise reduction ANC, in-car call ICC, echo cancellation and noise reduction Advanced audio algorithms such as ECNR, while significantly reducing the weight of existing cable harnesses (more than 75% in major applications); dedicated car video and camera bus technology C2B, providing low-latency HD quality video in the lowest cost infrastructure. It has low radiation to the outside world, strong resistance to external interference, and higher reliability for reliability. It is the next-generation video bus recommended by ADI; advanced human-computer interaction (HMI) and advanced technology solutions for driving (person) state detection. The 3D face recognition adopting the industry-leading car-level VGA resolution ToF technology has the characteristics of anti-glare and high resolution, and can realize face recognition and complex gesture recognition.
Resolutely optimistic about the development prospects of China's safe and intelligent new energy vehicles, ADI will continue to adhere to the "cooperative and win-win" concept, deeply participate in the early definition stage of partner products, and continue to provide auto-driving, powertrain/motor drive, High-performance, low-cost, differentiated system-level solutions for power management, cockpit infotainment systems, MEMS security, etc., help car manufacturers, Tier 1 deliver more efficient, environmentally friendly, safe and reliable products to Chinese consumers, for China's new energy vehicle market Steady and high growth to protect the escort.
