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Current detecting circuit and detecting method

A current detection circuit and current technology, which is applied in the direction of measurement using digital measurement technology, can solve the problem of low detection accuracy of sampling resistors, and achieve the effect of improving detection accuracy

Inactive Publication Date: 2019-09-20
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a current detection circuit and detection method to solve the problem of low detection accuracy of existing sampling resistors

Method used

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  • Current detecting circuit and detecting method

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Embodiment 1

[0042] As shown in Figures 3-4, this embodiment provides a current detection circuit, the current detection circuit includes a sampling resistor equivalent circuit 301, one or more first matching impedance Z1, second matching impedance Z2 and operational amplifier U1 , wherein: the sampling resistor equivalent circuit 301 includes a sampling resistor R and a parasitic inductance ESL; wherein, the current i to be detected SR It enters from the first end of the sampling resistor R, flows through the sampling resistor R to its second end, then flows into the first end of the parasitic inductance ESL, flows through the parasitic inductance ESL, and flows out from its second end.

[0043]A plurality of first matching impedances are respectively connected between one input terminal of the operational amplifier and the sampling resistor, and between the other input terminal of the operational amplifier and the parasitic inductance, as shown in Figure 3(a), a first A matching impedanc...

Embodiment 2

[0056] This embodiment also provides a current detection method based on the current detection circuit in the previous embodiment, including: obtaining the resistance value of the sampling resistor R; obtaining the inductance value of the parasitic inductance ESL; making the current i to be detected SR Flow through the sampling resistor R and the parasitic inductance ESL in sequence; measure the voltage across the second matching impedance Z2. In the current detection method, obtaining the inductance value of the parasitic inductance ESL includes: Image 6 As shown, a sawtooth wave current i is input to the sampling resistor equivalent circuit 301 SR1 , and the duration t1 of the rising edge and the duration t2 of the falling edge of the sawtooth wave current are known, and the difference Δi between the maximum current and the minimum current of the sawtooth wave current; measure the voltage value V on both sides of the parasitic inductance ESL , and obtain the maximum voltag...

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Abstract

The invention provides a current detecting circuit and a detecting method. The current detecting circuit includes a sampling resistance equivalent circuit, one or more first matching impedances, a second matching impedance, and an operational amplifier. The sampling resistance equivalent circuit includes a sampling resistor and a parasitic inductor. The plurality of first matching impedances are connected between an input end of the operational amplifier and the sampling resistor, and are connected between the other input end of the operational amplifier and the parasitic inductor. Or, one or more first matching impedances are only connected between one input end of the operational amplifier and the sampling resistor or the parasitic inductor. The second matching impedance is connected between the two input ends of the operational amplifier. Values of the first matching impedances and the second matching impedance satisfy that a voltage of the two ends of the sampling resistor equals to the voltage of the two ends of the second matching impedance .

Description

technical field [0001] The invention relates to the technical field of current detection, in particular to a current detection circuit and a detection method. Background technique [0002] In electronic circuits, the application of current detection circuits is very common, especially the accurate detection of peak current is of great significance to the overcurrent protection of circuits. There are many types of current detection circuits, and the most commonly used and simple method is the series resistance sampling method. For the detection of DC current, the series resistance can well guarantee its accuracy. However, for detecting the peak value of high-frequency current, the sampling accuracy drops sharply due to the prominent influence of the parasitic inductance of the sampling resistor itself. Contents of the invention [0003] The purpose of the present invention is to provide a current detection circuit and detection method to solve the problem of low detection...

Claims

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Application Information

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IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 崔永生王小昆梁东刘少伟陈岩
Owner UNITED AUTOMOTIVE ELECTRONICS SYST