Battery voltage sampling circuit, battery voltage sampling method, and battery pack voltage detection system

Abstract

The present invention provides a battery voltage sampling circuit, a battery voltage sampling method, and a battery pack voltage detection system. The battery voltage sampling circuit at least comprises: a bias signal input end, a bias circuit, a battery voltage voltage-division circuit, an operational amplifier circuit, a voltage-to-current circuit and a current-to-voltage module. The battery voltage sampling circuit provided by the invention integrally stays in a turn-off state when offset signals are not received, and the power consumption of the battery voltage sampling circuit is almost zero, so that the power consumption is greatly reduced; the battery voltage sampling circuit has different circuit structures with regard to a high-end battery and a low-end battery, the sampling precision is much higher and will not be influenced by the batter voltage, and even if the battery voltage approaches zero volt, the precision sampling may be performed, so that the sampling range is greatly expanded; and moreover, when the open circuit of a battery pack occurs, the voltage actually input to an operational amplifier is still in a normal working range due to the existence of the battery voltage voltage-division circuit, so that a chip will not be damaged and the chip and the battery pack voltage detection system may be effectively protected.

Description

technical field [0001] The invention relates to the technical field of battery voltage sampling, in particular to a battery voltage sampling circuit, a sampling method, and a battery pack voltage detection system. Background technique [0002] In the battery pack voltage detection system, it is often encountered that the voltage of each battery is sampled alternately. The traditional method is to simultaneously convert the voltage of each battery cell into a ground voltage through a sampling circuit, and then control the gating circuit through an external signal, and alternately sample the level of each channel to the buffer circuit to form the final input voltage. This method not only consumes a lot of power and has low sampling accuracy, but also the input terminal of the traditional sampling circuit has a low withstand voltage. Once the battery pack is opened, the internal chip is easily damaged. [0003] Specifically, traditional battery voltage sampling methods such as...

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Problems solved by technology

[0012] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a battery voltage sampling circuit, a sampling method, and a battery pack voltage detection system, which are used to solve the problem of large power consumption of the battery pack voltage monitoring system in the prior art, and the sampling voltage The accuracy is low, the sampling range is small, and the input terminal cannot withstand high voltage.

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