A detection unit, detection circuit and detection method

Abstract

The invention discloses a detecting unit, a detecting circuit and a detecting method which are used for detecting states of input signals. The detection unit comprises a source switch, a copy switch, a comparing unit and a signal matching unit. The source switch is used for receiving a first signal, and the first end of the source switch is provided with a first voltage; the copy switch is coupled to the source switch, one end of the copy switch is provided with a second voltage, and the source switch and the copy switch are used for producing a second signal which is used for being matched with the first signal; the comparing unit is coupled to the source switch and the copy switch and used for comparing an input signal with a reference signal and generating detection signal according to comparative results to represent the state of the input signal, and the reference signal is determined by the second signal; the signal matching unit is coupled to the source switch, the copy switch and the comparing unit and used for controlling a first voltage and a second voltage within the same voltage value to increase a matching index of the first signal and the second signal and accordingly to reduce deviation of detection results. The detecting unit, the detecting circuit and the detecting method can improve detection accuracy.

Description

technical field [0001] The invention relates to the battery field, in particular to a detection unit, a detection circuit and a detection method. Background technique [0002] figure 1 Shown is a schematic diagram of an overcurrent detection circuit 100 in the prior art. The battery assembly 101 is coupled between the PACK+ terminal and the PACK- terminal, and is used to supply power to a load (eg, electronic or electrical equipment), or to receive power from a power source. The traditional overcurrent detection circuit 100 includes a comparator 103 for converting the input voltage signal V IN with reference voltage signal V REF for comparison, where the input voltage signal V IN Indicates the charging / discharging current of the battery pack 101 . like figure 1 As shown, the input voltage signal V IN by the sense resistor R SEN provided, the sense resistor R SEN coupled in series to the battery pack 101, the reference voltage signal V REF provided by a voltage sour...

AI Technical Summary

Problems solved by technology

A small input voltage to comparator 103 (for example, the reference voltage signal V REF ) would lead to poor performance of the comparator 103, e.g. the comparator 103 would produce a control signal STR with non-negligible input deviation, or the comparator 103 might not function properly at all

Therefore, the input voltage signal V IN and reference voltage signal V REF The comparison between the results will be inaccurate and will affect the accuracy of overcurrent detection

Images