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Nonlinear current sampling assembly

A non-linear current and non-linear technology, applied in the direction of only measuring current, measuring current/voltage, measuring electrical variables, etc., can solve problems such as difficulty in meeting the needs of special applications, inability to improve the resolution of small current signals, etc. Anti-interference performance, improved resolution, small delay effect

Active Publication Date: 2016-04-20
颍上县健辉农牧有机肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example is patents CN200810018517.8 and CN201110268069.9. Although they have some advantages, they are still based on the principle of linear sampling of Hall elements or resistors, so the resolution of small current signals cannot be improved, and it is difficult to meet the needs of some special applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Please see image 3 , A nonlinear current sampling component is composed of a PNP transistor. When used for AC current nonlinear sampling, the nonlinear component (1) is composed of two sets of PNP transistors V21 and V22 in antiparallel connection, the number of each group of PNP transistors and the maximum value of branch current and each PNP transistor related to the rated current value. When the sampled branch current is small, both V21 and V22 can be composed of one PNP transistor, and when the sampled branch current is large, both V21 and V22 need to use multiple PNP transistors in parallel, each PNP The base and collector of the triode are connected together. When used for non-linear sampling of DC current, the non-linear component (1) only needs one set of PNP transistors V21 or V22. The principle of using PNP transistors at this time is that the branch current direction flows from the emitter to the collector electrode. The compensation element (2) uses a l...

Embodiment 2

[0032] Please see Figure 4 , A nonlinear current sampling component is composed of an NPN transistor. When used for nonlinear sampling of AC current, the nonlinear component (1) is composed of two sets of NPN transistors V31 and V32 connected in reverse parallel. The number of NPN transistors in each group and the maximum value of branch current and each NPN transistor related to the rated current value. When the sampled branch current is small, both V31 and V32 can be composed of one NPN transistor, and when the sampled branch current is large, both V31 and V32 need to use multiple NPN transistors in parallel, each NPN The base and collector of the triode are connected together. When used for non-linear sampling of DC current, the non-linear component (1) only needs one set of NPN transistors V31 or V32. The principle of using NPN transistors at this time is that the branch current direction flows from the collector of the NPN transistors to the emitter. pole. The compen...

Embodiment 3

[0035] Please see Figure 5 , a nonlinear current sampling component composed of diodes. When used for nonlinear sampling of AC current, the nonlinear component (1) is composed of two sets of diodes D1 and D2 connected in antiparallel, and the number of each set of diodes is related to the maximum value of branch current and the rated current value of each diode. When the sampled branch current is small, both D1 and D2 can be composed of one diode, and when the sampled branch current is large, both D1 and D2 need to use multiple diodes connected in parallel in the same direction. When used for non-linear sampling of DC current, the non-linear component (1) only needs one set of diodes D1 or D2, and a set of diodes whose current direction is consistent with the branch current direction when the diode is turned on is used. The compensation element (2) uses a linear resistor R1, which is connected in parallel at both ends of the nonlinear component (1), and the voltage signal ob...

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Abstract

A nonlinear current sampling assembly comprises a nonlinear assembly (1), a compensating element (2) and a current signal processing unit (3). The nonlinear assembly (1) and the compensating element (2) are in electrical parallel connection, and after parallel connection, the two ends are electrically connected with the current signal processing unit (3). The assembly is mainly used for meeting the requirements of some special applications, the resolution and anti-interference performance can be improved when instant small current signals occur, it can be guaranteed that the voltage drop of the sampling assembly is low when large current signals occur, the power loss of the sampling assembly is effectively reduced when a large occurs, and the time delay of sampling signals is small.

Description

technical field [0001] The invention relates to a current sampling component, in particular to a nonlinear current sampling component for thyristor switch control, belonging to the technical field of power electronic circuits. Background technique [0002] The thyristor has advantages in the application of high voltage and high current. However, its ability to withstand overvoltage and overcurrent is very poor, and the heat capacity of the thyristor is very small. Once an overcurrent occurs, the temperature rises sharply, which may burn out the PN junction. Cause internal short circuit or open circuit of the component. For example, when the overcurrent of a 100A thyristor is 400A, it is only allowed to last for 0.02 seconds, otherwise it will be damaged due to overheating; the ability of the thyristor to withstand overvoltage is extremely poor, and when the voltage exceeds its reverse breakdown voltage, even if the time is extremely short , are also easily damaged. If the ...

Claims

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Application Information

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IPC IPC(8): G01R19/00
CPCG01R19/0053G01R19/0092
Inventor 涂金龙米永胜
Owner 颍上县健辉农牧有机肥有限公司
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