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IIC isolation circuit for series connection of multiple BMS AFE ICs

A technology of isolating circuits and circuits, applied in general control systems, instruments, computer control and other directions, can solve the problems of high cost of isolated power supply and isolated IIC chips, affecting the storage performance of lithium batteries, and high static power consumption of circuits, so as to improve market competition. power, reduce circuit costs, and reduce maintenance costs

Pending Publication Date: 2020-11-10
福建飞毛腿动力科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of isolated power supply and isolated IIC chip is very high. The reason is that the isolation chip costs 12 yuan + isolated power supply 10 yuan + DCDC 8 yuan. At the same time, the static power consumption of the circuit is also high, which affects the storage performance of lithium batteries.

Method used

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  • IIC isolation circuit for series connection of multiple BMS AFE ICs
  • IIC isolation circuit for series connection of multiple BMS AFE ICs
  • IIC isolation circuit for series connection of multiple BMS AFE ICs

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Embodiment Construction

[0018] The technical scheme of the present invention will be further described below in conjunction with the accompanying drawings of the description:

[0019] Such as figure 2 As shown, an IIC isolation circuit for multiple BMS AFE ICs in series, including ground signal B-, power supply L3.3V, ground signal B11-, power supply H3.3V, and also includes a BMS AFE IC circuit, single-chip microcomputer MCU3, This BMS AFE IC circuit is connected to the single-chip microcomputer MCU3, and the single-chip microcomputer MCU3 is connected to the ground signal B-, and the single-chip microcomputer MCU3 is also connected to the power supply L3.3V. The BMS AFE IC circuit includes 20 strings of batteries, and one high-side BMS AFE IC chip 1 , 1 low-side BMS AFE IC chip 2, 2 IIC communication isolation circuits, the 20 strings of batteries are connected in series in sequence, the 20 strings of batteries are B1 to B20, the high-side BMS AFE IC chip 1, the low-side BMS AFE IC chip 2 are all...

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Abstract

The invention discloses an IIC isolation circuit for series connection of multiple BMS AFE ICs. The IIC isolation circuit comprises a ground signal B-, a power supply L3.3 V, a ground signal B11- anda power supply H3.3 V, and further comprises a plurality of BMS AFE IC circuits and a single-chip microcomputer MCU; the BMS AFE IC circuits are connected with the single-chip microcomputer MCU, the single-chip microcomputer MCU is connected with the ground signal B- and the power supply L3.3 V, and each BMS AFE IC circuit comprises 20 strings of batteries, a high-side BMS AFE IC chip, a low-sideBMS AFE IC chip, two IIC communication isolation circuits; the circuit can greatly reduce the circuit cost of the isolation IIC, reduces the circuit complexity, reduces the circuit operation power consumption, prolongs the service life of a product, and reduces the maintenance cost of a battery.

Description

technical field [0001] The invention relates to an IIC isolation circuit used for connecting multiple BMS AFE ICs in series. Background technique [0002] Lithium batteries have safety risks if they exceed a certain temperature, voltage, and current range, so BMS is required to collect and protect voltage, current, and temperature. The BMS AFE IC chip is a highly integrated analog front-end chip, which can mainly collect the voltage of each cell of the battery pack, the temperature of the battery pack, and the total current of the battery pack, and provide LDO 3.3V power supply. At the same time, it can be connected to the MCU through the communication interface of the IC for data transmission, which is used for calculation and protection by the MCU. Most BMS AFE IC chips use IIC communication interface to communicate with MCU. At present, the battery on the market does not exceed 16 strings at most, corresponding to products with a high number of strings, such as 20 strin...

Claims

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Application Information

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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/21119
Inventor 杨麒麟俞峰刘斌生
Owner 福建飞毛腿动力科技有限公司
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