Constant current loop

A constant current loop and current detection technology, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, can solve problems such as unfavorable system imbalance detection accuracy, and achieve low implementation costs, simplified loop structure, and high precision. Effect
CN103970170AActive Publication Date: 2014-08-06SANECHIPS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SANECHIPS TECH CO LTD
Publication Date
2014-08-06

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Abstract

The invention discloses a constant current loop, which comprises an EA (error amplifier) and a power supply, wherein one end of the EA is connected with one end of a current detection element, and the other end of the EA is connected with the other end of the current detection element through a reference generation element; one end of the power supply is grounded, and the other end of the power supply is connected with the source or drain of a metal oxide layer semiconductor field effect transistor; the drain or source of the metal oxide layer semiconductor field effect transistor is connected with the other end of the current detection element. According to the constant current loop, the EA is directly used for forming a negative feedback closed loop, and the whole loop has only one EA gain stage; the offset voltage and bias current of the whole loop are reduced, so that constant current is higher in accuracy; in addition, the structure of the loop is simplified, and the implementation cost is lowered.
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Description

technical field

[0001] The invention relates to the field of battery technology, in particular to a constant current loop applied in the field of power management or current detection. Background technique

[0002] Such as figure 1 As shown, the current implementation of high-precision constant current loop or current detection circuit is: through the operational amplifier and R1, R2, R3, R4 to form a closed-loop negative feedback (where R1=R3; R2=R4), sampling the current detection element The voltage drop across Rsense is amplified, and the output is at Vout.

[0003] The closed loop gain is:

[0004] A closed = V out V sense = R 2 R 1 ( R 1 = R 3 ...

Claims

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