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Current detection amplifier circuit with wide input common-mode voltage range

An amplifier circuit and common-mode voltage technology, which is applied in the field of current detection amplifier circuits with a wide input common-mode voltage range, can solve problems such as increasing costs, higher than power supply voltage or lower than ground level, and occupying chip area.

Active Publication Date: 2020-09-29
GUANGDONG GREATER BAY AREA INST OF INTEGRATED CIRCUIT & SYST
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the power system, it is necessary to detect the load current in real time. In the prior art, when the detection point is on the power line or the ground line, the input common-mode voltage is the power supply voltage or the ground line voltage, and the comparator is easy to implement. If it is necessary to directly detect the voltage on the load When the current is high, the common-mode voltage changes in a wide range when the load is turned on and off. Due to the inductive load and wiring inductance, it may even be higher than the power supply voltage or lower than the ground level. The input common-mode range requirements of the corresponding operational amplifier From negative voltage to higher than the power supply voltage, additional high voltage devices are required to occupy the chip area and increase the cost. Therefore, a current sense amplifier circuit with a wide input common mode voltage range is designed to optimize the above problems

Method used

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  • Current detection amplifier circuit with wide input common-mode voltage range
  • Current detection amplifier circuit with wide input common-mode voltage range
  • Current detection amplifier circuit with wide input common-mode voltage range

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Embodiment Construction

[0020] In order to make the technical solutions of the present invention clearer and clearer to those skilled in the art, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0021] Such as image 3 As shown, a wide input common-mode voltage range current detection amplifier circuit includes an operational amplifier OPA1, the positive pole of the operational amplifier OPA1 is connected to the reference level, and the negative pole of the operational amplifier OPA1 is electrically connected to the source of the field effect transistor MN1 and the source of the field effect transistor MP1, the negative pole of the operational amplifier OPA1 is also connected to one end of the resistor R2, the other end of the resistor R2 is externally connected to the terminal SN as the input detection terminal, and the output terminal of the operational a...

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Abstract

The invention discloses a current detection amplifier circuit with a wide input common-mode voltage range. The invention belongs to the technical field of current detection amplifier circuits. Duringcurrent detection, an operational amplifier with a limited input common-mode range in a low-voltage domain is used for realizing common-mode voltage input in an ultra-wide range, the voltage drop of high voltage is reduced on a resistor, all operational circuits are realized by low-voltage devices, a high-voltage voltage source and high-voltage devices do not need to be additionally generated, andrequired functions can be realized in an ultra-small area.

Description

technical field [0001] The invention relates to a current detection amplifier circuit, in particular to a current detection amplifier circuit with a wide input common-mode voltage range, belonging to the technical field of current detection amplifier circuits. Background technique [0002] In the power system, it is necessary to detect the load current in real time. In the prior art, when the detection point is on the power line or the ground line, the input common-mode voltage is the power supply voltage or the ground line voltage, and the comparator is easy to implement. If it is necessary to directly detect the voltage on the load When the current is high, the common-mode voltage changes in a wide range when the load is turned on and off. Due to the inductive load and wiring inductance, it may even be higher than the power supply voltage or lower than the ground level. The input common-mode range requirements of the corresponding operational amplifier From negative voltag...

Claims

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Application Information

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IPC IPC(8): G01R1/30G01R19/00
CPCG01R1/30G01R19/0092
Inventor 王飞王云郑鲲鲲郝炳贤任广辉薛静王桂磊亨利·阿达姆松
Owner GUANGDONG GREATER BAY AREA INST OF INTEGRATED CIRCUIT & SYST
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