ADI's latest system solution solves the power supply problem of new energy vehicles

Despite the different battery pack sizes, various lithium battery power systems have similar requirements in the following aspects:

In order to maximize the use of lithium battery power and fully guarantee the service life, complex battery monitoring circuits must be introduced. These electronic circuits can monitor the voltage and temperature of battery cells, monitor the voltage and current of battery packs composed of multiple battery cells connected in series, balance the voltage between battery cells, and transmit data signals across potential barriers. The purpose is to ensure that the battery works efficiently and safely during driving and charging, and to extend the battery life.

The battery management system (BMS) must accurately measure the different battery cells in the presence of high common-mode voltages and switching transients up to hundreds of amperes. The system must be accurate to the mV level and the sampling must be synchronized within a tight delay time range. Both sampling speed and accuracy affect the efficiency of the entire system.

The system also requires the BMS to have lower power consumption to reduce the consumption of battery power and avoid aggravating battery imbalance, so the power consumption of the monitor IC and isolation circuit should be as low as possible. In addition, the future trend is the need for active balancing solutions.

ADI (LTC) lithium battery monitoring IC products have developed to the fourth generation since 2008. Safety, accuracy and functionality have been continuously improved, and they are always the best choice in the industry.

ADI's latest fourth-generation lithium battery master monitoring IC product LTC6811 can monitor the voltage and temperature of 12 channels respectively (future products will provide more flexible channel numbers), with a limit accuracy better than 1.2 mV. Multiple LTC6811s can be connected in a daisy chain. The IC provides the industry's fastest conversion speed and best data protection. Data from 12 channels can be detected within 290 μs. In addition, the IC also provides passive battery cell balancing control function.

ADI's digital isolator iCoupler® is optimized for automotive applications and can achieve the lowest power consumption at high data rates. Its small package size and multiple channel options minimize the number of components and the board area it occupies; in addition, the series provides its high reliability and quality assurance throughout its entire life cycle. This series is widely used as SPI/GPIO/clock isolators between high-voltage circuits and low-voltage circuits. isoPower® is ADI's unique integrated power digital isolator solution that provides isolated power and multi-channel digital isolation functions; compared with discrete dc-to-dc isolators plus digital isolators, isoPower has lower costs and occupies a smaller area. ADI offers a variety of integrated solutions, and the product range is still expanding.

Isolated SPI Architecture

Daisy chain architecture