Design And Verification Of Daisy-chain Communication Interface For Battery Management Front-end Chip

The battery management chip is an important part of the battery management system,and it is also an important means for battery detection and monitoring.It can be used to check and manage the battery status in real time,and plays a vital role in battery safety.Since the battery management system is composed of many batteries,how to detect all batteries accurately,timely and at low cost has become the focus and difficulty of research.In the actual industrial or vehicle field,higher usage conditions and communication method requirements are also put forward for related chips.This paper mainly makes new research on the communication part of the battery management chip,explores,researches and verifies an anti-jamming method based on the daisy chain communication method and a communication synchronization and sampling method without a fixed frequency between chips,and develops a battery management for the subject.The chip provides a simpler and more reliable means of communication.By analyzing and comparing the current commonly used communication methods and anti-interference processing methods,considering the actual use of the chip,the differential line is used as the communication physical solution,referring to the use of Manchester encoding with DC balance for data transmission,and using the resistance-capacitance isolation technology to separate the chip Data isolation transmission,designed and conceived a communication synchronization and sampling method without a fixed frequency,so that the chips can still transmit data normally and stably under conditions such as different main clocks,different voltages,and complex electromagnetic environments.Finally,a series of verification and test schemes are designed for the communication interface,and the actual test results are obtained,and improvements are made for the communication results and actual application effects.The focus and difficulty of this paper are the clock recovery and data sampling with indeterminate phase frequency between chips.The main research direction of this paper is to use the form of daisy chain to realize stable and reliable communication in a complex environment,put forward practical design schemes and ideas for the key points and difficulties of the research,and combine FPGA for system verification and testing,and finally obtain a stable and reliable battery.Manage the communication scheme of the chip.