Capacitor-based micro-current acquisition circuit and method

Abstract

The invention provides a capacitor-based micro-current acquisition circuit and method in the technical field of lithium battery pack protection board testing. The circuit comprises a micro-control unit U1, an analog-to-digital conversion chip U2, a current acquisition module, a switch switching module and a constant current source V, one end of the analog-to-digital conversion chip U2 is connected with the micro-control unit U1, and the other end of the analog-to-digital conversion chip U2 is connected with the current acquisition module; one end of the switch switching module is connected with the current acquisition module, and the other end of the switch switching module is connected with the constant current source V; the micro-control unit U1 is connected with the current acquisition module and the switch switching module. The micro-current acquisition circuit has the advantage that the micro-current acquisition precision is greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery pack protection board testing, in particular to a capacitor-based micro-current acquisition circuit and method. Background technique [0002] After the lithium battery pack is produced, it is necessary to use test equipment to test its protection board. With the advancement of technology, the test equipment of the protection board is also developing towards convenience and miniaturization. Due to the need to test a large number of protection boards, Frequent charging of the test equipment is inevitable. [0003] In order to prolong the use time of the test equipment, there are two methods to increase the battery capacity of the test equipment and reduce the power consumption. Increasing the battery capacity is undoubtedly contrary to the development direction of convenience and miniaturization, so the method of reducing power consumption is generally adopted. [0004] Reducing power consu...

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above formula that the final calculated current I in It is closely related to the value of the sampling capacitor Cs. However, in actual use, the capacitance of the sampling capacitor Cs will be affected by factors such as temperature, humidity, dust, vibration, and capacitor aging. If the capacitance has changed, the initial capacitance is still used. capacity to calculate the current I in , which will undoubtedly directly affect the accuracy of current acquisition

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