High-voltage signal sampling circuit based on double sampling technology

Abstract

The invention provides a high-voltage signal sampling circuit based on a double sampling technology. The high-voltage signal sampling circuit comprises a third sampling capacitor CS3, a fourth sampling capacitor CS4, a fully-differential transconductance amplifier S, a third integrating capacitor CI3, a fourth integrating capacitor CI4, a first switch c1, a second switch c2, a third switch c3, a fourth switch c4, a fifth switch c5, a sixth switch c6, a seventh switch c7 and an eighth switch c8. The high-voltage signal sampling circuit based on the double sampling technology provided by the invention has the following effects and advantages: the double sampling technology is employed by the circuit, so the problem that the voltage collection on a high-voltage lithium battery cannot be implemented due to no high-voltage capacitor in a low-voltage CMOS process can be effectively solved, namely, the low-voltage CMOS process can be utilized to replace a high-voltage CMOS process, and thus, the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of high voltage sampling, in particular to a high voltage signal sampling circuit based on double sampling technology. Background technique [0002] With the continuous improvement of people's living standards, people have higher requirements for the living environment. Therefore, in order to reduce the exhaust emissions of automobiles and reduce environmental pollution, new vehicles such as electric bicycles, electric vehicles, and scooters are more and more subject to people's attention and liking. Among them, the battery is the core part of these products, and its safety and service life have become the focus of product design. Therefore, in order to improve the service life of the battery and ensure the safety of the battery, a battery charge and discharge monitoring, management and control circuit chip has been proposed and effectively used in different electronic products. figure 1 A simple block dia...

AI Technical Summary

Problems solved by technology

It can be seen that when the switch S1 is turned on (the first battery is selected), due to the cascade connection of n batteries, the charging voltages (vinp-vcm) and (vinn-vcm) on the two sampling capacitors are relatively high, therefore, in Both sampling capacitors in the circuit need "high-voltage capacitors" to realize, but some processes do not provide "high-voltage capacitor" models, and the process of providing "high-voltage capacitors" is usually relatively expensive

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