Current sampling circuit

Abstract

The invention relates to a battery management system, and discloses a current sampling circuit. The current sampling circuit comprises a collecting circuit, a switching circuit, a serial bus separation circuit and a signal buffering circuit; the collecting circuit is used for collecting a simulated current signal; the input end of the switching circuit is connected with the output end of the collecting circuit, and the switching circuit is used for switching the simulated current signal to a digital current signal; the input end of the serial bus separation circuit is connected with the outputend of the switching circuit, and the serial bus separation circuit is used for switching the digital current signal to a serial current signal conforming to a serial bus protocol; and the input endof the signal buffering circuit is connected with the output end of the serial bus separation circuit, the signal buffering circuit is used for buffering output of the serial current signal, the high-precision requirement of current sampling is achieved, and meanwhile, the production cost is lowered.

Description

【Technical field】 [0001] The invention relates to the field of battery management systems, in particular to a current sampling circuit. 【Background technique】 [0002] The battery management system is usually responsible for the calculation of battery power in the battery pack, battery protection, power balance control between batteries, and signal communication inside and outside the battery management system. In the existing technology, products that generally use batteries need to be controlled with a battery management system. Current detection is one of the important functional modules. It involves the calculation of SOC, SOH, etc., and is an important part of the BMS system. parameter. [0003] At present, the existing current detection on the market includes closed-loop Hall sensor type and precision micro-resistor: although the closed-loop Hall sensor type is relatively stable, it is difficult to achieve the required high precision, although the signal collected by ...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing current detection on the market includes closed-loop Hall sensor type and precision micro-resistor: although the closed-loop Hall sensor type is relatively stable, it is difficult to achieve the required high precision, although the signal collected by precision micro-resistor is precisely amplified Afterwards, collect the A / D port of the single-chip microcomputer, add a CAN BUS interface after the single-chip microcomputer, transmit data through the CAN bus, and process it to the main CPU to achieve high-precision requirements, but at the same time increase the production cost

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