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Mobile WebSiteWith the development of the car to the intelligent, the car from the mechanical system to the electronic system conversion, the current car used in electrical and electronic products accounted for the proportion of total car costs from 25% to 40%, and ADAS, automatic driving, car information System, car network need hardware this ticket. How to find a breakthrough point, become particularly critical.
Wireless BMS concept car
The first wireless car battery management system (BMS) concept car by the Linear Technology design partner LION Smart development, it is a highly accurate Linear Battery Monitor and its SmartMesh wireless mesh network products on the BMW i3 models Has been integrated to replace the traditional wired connection between the battery pack and the battery management system.
This major breakthrough addresses the reliability issues that have arisen and perpetuate due to the wiring harnesses and connecting lines in electric vehicles and hybrid / electric vehicles, and simplifies BMS design and manufacturing.
According to Linear engineers, car manufacturers are faced with the challenge of driving the public to ensure both electric and hybrid cars with both safety and reliability. The LTC6811 battery pack monitors the voltage of up to 12 tandem cells and has an accuracy of better than 0.04%, combined with the SmartMesh wireless mesh network system to address automotive wiring harnesses and connectors Long - standing reliability issues.
Wireless BMS system opportunities
BMS is based on the measurement of voltage, current, temperature to understand the mileage of the car mileage, the way the cable is a prominent point of security, intelligence, environmental protection, cheap, has been in use ever since. SmartMesh wireless BMS compared to the traditional wired BMS system, SmartMesh more secure, smarter, more environmentally friendly, cheaper, coupled with the development and advancement of the industry, its market prospects can not be underestimated.
More secure: whether it is CAN bus or isoSPI bus, are used daisy-chained battery monitoring chip in series, once somewhere connected problems, the entire system will be paralyzed. Linear's wireless BMS solution does not have this problem, path classification and frequency hopping, to achieve more than 99.999% of the reliability; the same time SmartMesh is a 128-bit encryption dedicated network, more secure;
Smart: The wireless connection makes the battery location more flexible, with better scalability, easy to increase the temperature, current and other sensors according to the application needs, in the harsh environment is more time synchronization The advantages''
More environmentally friendly: the wireless solution allows each car to save 10m wire and 0.5kg connector and inverter. Therefore, each production of 50,000 vehicles, will save 500km of wire and 25000kg connector and inverter. In the cost of saving at the same time to meet the trend of lightweight cars;
Cheaper: wireless way to reduce the cost of assembly, the future of silicon than wire and connector cheaper, the total cost of BMS will be lower.
In addition, the use of SmartMesh IP network, the world's existing 6000 networks using the technology, the maximum number of nodes to support thousands of nodes, the use of WirelessHart technology, can effectively avoid the network burst data congestion, and many Features similar to the previously applied SmartMesh technology applied to BMS.
Introduces 100V multi-topology controller for optimized charging performance
The new LTC3871 is a 48V / 12V step-down product. When 12V full, or 48V need to charge, you can carry out 12V-48V boost, they share a set of circuits, can be used for car start-stop start and stop devices.
According to reports, many users are interested in the LTC3871, because compared to hybrid (HEV), 48V pure electric car (EV) easier, due to mixed with oil and electricity switching problem. For the traditional car, start and stop is the easiest to achieve, just a few small changes, so that after the brake flameout, you can achieve the purpose of saving oil; if the traditional car has 48V lithium, you can also turn off the gasoline engine, the car also Can travel for some time.
LT8708 is a two-way step-up and down, can be stacked more. If 12 batteries, a phase is 20A, 20Ax12 is 240A, if a phase is 25A, 25Ax12 = 300, is 300A. 12V power, the charge is full will discharge, LT8705 will produce electricity, here to increase the LTC4359, to prevent the return.
The LTC3871 is a step-up and step-down regulator for a 48V-12V battery pack in an electric car and hybrid car. It can be boosted and controlled by the same set of circuits, saving chip size and eliminating the need for DFT digital control technology. Level settings can control their own loop effect, simple design and high reliability. LT8705, LT8708 is a one-way step-up and step-down regulator, through the parallel can achieve greater current.
Summary: SmartMesh and the traditional network is not the same, was a grid structure, each node can be used as a node to transmit data and can be used as a router, so if there is a network congestion, you can replace the path to transfer data. In addition, SmartMesh network can also be frequency hopping, when the wireless signal interference occurs when the replacement frequency.
For wireless transmission, real-time is the most important, especially for BMS systems, must be real-time monitoring of temperature, voltage and other information. SmartMesh has the concept of a synchronous clock to ensure that all nodes have data transfer clock synchronization, so that the recorded data is more accurate than traditional time-sharing. Source: Electronic enthusiasts
