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Input current detection circuit and method

A technology of voltage detection circuit and input current, applied in the direction of measuring current/voltage, components of electrical measuring instruments, measuring electricity, etc., can solve the problems of adding special power detection chips, high detection cost, large resistance loss, etc. Reliable principle, wide application prospect, simple structure effect

Active Publication Date: 2020-07-10
SUZHOU LANGCHAO INTELLIGENT TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above methods all need a high-precision resistor in series. In production, the cost of high-precision resistors is expensive, and the resistance loss is relatively large; adding a dedicated power detection chip makes the detection cost higher

Method used

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  • Input current detection circuit and method

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Embodiment 1

[0040] Such as figure 1 As shown, the embodiment of the present application provides an input current detection circuit, including: a power filter, two ceramic capacitors and a detection circuit. The common mode filter circuit includes two common mode inductors, the coils of the two common mode inductors are wound on the same iron core, and the number of turns of the coils is the same, and the winding directions are opposite; the two ceramic capacitors are only connected to one of them The two ends of the common-mode inductance, the other end of the two ceramic capacitors are connected to the input terminals of the detection circuit; the detection circuit includes two voltage detection circuits and a single-chip microcomputer; one end of the two voltage detection circuits is respectively connected to two ceramic capacitors , the other ends of the two voltage detection circuits are grounded; the voltage detection circuit includes two resistors connected in series; a resistance ...

Embodiment 2

[0050] Such as figure 2 As shown, the embodiment of the present application provides an input current detection circuit. The difference between this embodiment and Embodiment 1 is that two ceramic capacitors are connected to both ends of another common mode inductor. The difference brought about Function effect is the same as embodiment 1.

Embodiment 3

[0052] Such as image 3As shown, the embodiment of the present application provides an input current detection circuit. This embodiment adds a fuse on the basis of Embodiment 1. The fuse is arranged on the line between the external power supply and the power filter. The fuse It protects the input detection circuit.

[0053] Figure 4 is a schematic flowchart of a method in one embodiment of the present invention. in, Figure 4 The execution subject may be an input current detection circuit.

[0054] Such as Figure 4 As shown, the method 100 includes:

[0055] Step 110, collecting the voltages of the two resistor divider points before and after the common mode inductor;

[0056] Step 120, calculating the input voltage and output voltage of the common mode inductor according to the voltage and the resistance value of the line where the resistance voltage dividing point is located;

[0057] Step 130, calculating the difference between the input voltage and the output volt...

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Abstract

The invention provides an input current detection circuit and method. The circuit comprises a power supply filter, two ceramic capacitors and a detection circuit. The power supply filter is externallyconnected with a power supply, a common-mode filter circuit is arranged in the power supply filter, the two ends of the common-mode filter circuit are respectively connected with the two ceramic capacitors, and the other ends of the two ceramic capacitors are connected with the input end of the detection circuit. When the circuit is deployed in large-scale edge computing or used in other fields,the cost of the configured power supply module can be reduced.

Description

technical field [0001] The invention belongs to the technical field of current detection, and in particular relates to an input current detection circuit and method. Background technique [0002] With the improvement of the communication rate of mobile devices, more and more ICT devices are used in edge computing applications. Because the devices are far away from the data center, some remote monitoring and management of the devices is required, and the power of the devices is also an important monitoring indicator; The applied equipment has high cost requirements, and the power accuracy requirements of the edge equipment are not particularly high, so it is necessary to find a low-cost power detection method as soon as possible. [0003] The existing input current detection methods mainly include the following two types: [0004] (1) if figure 1 As shown, by detecting the voltage at both ends of the high-precision resistor connected in series to the input main power circui...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R1/30
CPCG01R19/00G01R1/30
Inventor 陈玉堂
Owner SUZHOU LANGCHAO INTELLIGENT TECH CO LTD
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