A high-precision current detection circuit and a current limiting device using the circuit

A technology of current detection circuit and current limiting device, which is applied in the direction of measuring device, measuring current/voltage, output power conversion device, etc., can solve the problems of unable to perform current limiting control in time, unable to use current detection, slow response speed, etc. Achieve the effect of convenient and flexible application, saving component cost and improving precision

Inactive Publication Date: 2017-07-28
广州钧衡微电子科技有限公司
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  • Abstract
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Problems solved by technology

[0006] Chinese invention patent CN103412180A, in order to solve the problem of slow response speed of the latter implementation, proposes an overcurrent detection current circuit, which improves the response speed of detection of overcurrent faults, but it has the following disadvantages: it only has the function of overcurrent detection, It cannot be used for current detection, and its accuracy is low, and it cannot perform current limiting control in time

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  • A high-precision current detection circuit and a current limiting device using the circuit
  • A high-precision current detection circuit and a current limiting device using the circuit
  • A high-precision current detection circuit and a current limiting device using the circuit

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Embodiment Construction

[0033] refer to image 3 , a high-precision current detection circuit of the present invention includes a device under test, an amplifier and a load, and the amplifier includes a first resistor R1, a second resistor R2, a third resistor R3, a first PMOS transistor MP1, and a second PMOS transistor MP2 , the third PMOS transistor MP3, the first NMOS transistor MN1, the second NMOS transistor MN2, the third NMOS transistor MN3 and the first bias current source IB1, the non-inverting input terminal of the amplifier passes through the inverting input of the device under test and the amplifier The inverting input terminal of the amplifier is connected to the ground through the load, the non-inverting input terminal of the amplifier is connected to the power supply voltage, and the inverting input terminal of the amplifier is connected to the source of the first PMOS transistor MP1 through the first resistor R1 The gate of the first PMOS transistor MP1 is respectively connected to t...

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Abstract

The invention discloses a high-precision current detecting circuit and a current-limiting device applying the same. The high-precision current detecting circuit comprises a device to be detected, an amplifier and a load, the precision can be effectively improved, and a response speed can be greatly improved. A power amplifier current-limiting device and a switching power current-limiting device can effectively achieve an overcurrent protecting function. The structure is simple, element cost can be effectively saved, the implement mode is simple, and a designer can use the high-precision current detecting circuit and the current-limiting device flexibly and conveniently. The high-precision current detecting circuit and the current-limiting device applying the same can be widely applied to current detecting products.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a high-precision current detection circuit and a current limiting device using the circuit. Background technique [0002] The current detection circuit can monitor the working current of the power management system, motor control system, high-power device or equipment in real time, and can detect the overcurrent fault caused by short circuit, overload and other reasons in time, and take corresponding protection actions , It can also implement dynamic management of the system by monitoring the operating status of the system in real time, which is conducive to improving the reliability of the system and prolonging its service life. [0003] At present, there are many ways to implement current detection by sampling the load current through the detection resistor, which can be roughly divided into two categories: 1. The voltage established at both ends of the detection resistor is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00H02M1/32
Inventor 余凯刘炽锋李思臻章国豪冯卫锋郑卫国
Owner 广州钧衡微电子科技有限公司
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