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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AI-Extracted 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 o...
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Method used

Because the present invention carries out bypass control at the high-voltage side of transformer, thereby control current is less, the capacity of required electric element is little, compared with prior art switching bypass at main circuit, required bypass Electrical components are small in size, low in cost, high in reliability, and easy to control.
Please refer to Fig. 1, non-linear assembly (1) forms electrical parallel connection with compensating element (2), and the two ends after paralleling form electrical connection with current signal processing unit (3); Non-linear assembly (1) and compensation After the components (2) are electrically connected in parallel, they are electrically connected in series to the current branch (4) to be sampled. When the sampled current passes through the nonlinear component (1), a voltage signal is formed on the nonlinear component (1), and the voltage signal is taken out and sent to the current signal processing unit (3). Since the current sampling is taken according to the nonlinear electrical characteristics of the nonlinear component (1), it can not only achieve a high enough resolution in the instantaneous small current signal, but also ensure the voltage drop on the sampling element in the case of a large current signal Low, so as to effectively reduce the power loss of the sampling component when the current is high, and because the capacitance of the nonlinear component itself is very small, the delay of the signal of the sampling current is very small. In order to make the sampling signal have better consistent electrical characteristics in the case of small current signals, a compensation element (2) is connected in parallel at both...
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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.

Application Domain

Current measurements only

Technology Topic

Image resolutionSignal processing +5

Image

  • Nonlinear current sampling assembly
  • Nonlinear current sampling assembly
  • Nonlinear current sampling assembly

Examples

  • Experimental program(4)

Example Embodiment

[0028] Example 1:
[0029] Please see image 3 , A non-linear current sampling component is formed by a PNP transistor. When used for non-linear sampling of AC current, the non-linear component (1) consists of two groups of PNP type transistors V21 and V22 connected in anti-parallel, the number of each group of PNP type transistors and the maximum value of branch current and each PNP type transistor The rated current value is related. When the branch current to be sampled is small, both V21 and V22 can be composed of one PNP type triode, and when the branch current to be sampled is large, V21 and V22 need to use multiple PNP type triodes 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 1 set of PNP type transistors V21 or V22. At this time, the principle of using PNP type transistors is that the direction of branch current flows from the emitter of the PNP type transistor to the collector. electrode. The compensation element (2) uses a linear resistor R21, which is connected in parallel to both ends of the non-linear component (1), and the voltage signal obtained thereby is sent to the current signal processing unit (3).
[0030] The base of the triode V21 is connected with the collector and the emitter of the triode V22; the base of the triode V22 is connected with the collector and the emitter of the triode V21 to form the anti-parallel connection of the triode V21 and V22, and then in parallel with the linear resistor R21 connection. In this connection mode, the transistors V21 and V22 work in a critical saturation state. When combined with the linear resistor R21, it can not only improve the resolution of instantaneous small current signals, but also improve the anti-interference performance of small current signals, and it is also effective Reduce the voltage drop on the transistors V21 and V22 of the positive and negative half-wave high current signals of the alternating current, and effectively reduce the power loss of the sampling component when the current is high.

Example Embodiment

[0031] Example 2:
[0032] Please see Figure 4 , A non-linear current sampling component is formed by an NPN transistor. When used for non-linear sampling of AC current, the non-linear component (1) consists of two sets of NPN transistors V31 and V32 connected in anti-parallel, the number of each group of NPN transistors and the maximum value of branch current and each NPN transistor The rated current value is related. When the branch current to be sampled is small, both V31 and V32 can be composed of one NPN transistor. When the branch current to be sampled is large, 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 1 set of NPN transistors V31 or V32. At this time, the principle of using NPN transistors is that the direction of the branch current flows from the collector of the NPN transistor to the emission. pole. The compensation element (2) uses a linear resistor R31, which is connected in parallel to both ends of the non-linear component (1), and the voltage signal obtained thereby is sent to the current signal processing unit (3).
[0033] The base of the triode V31 is connected to the collector and the emitter of the triode V32; the base of the triode V32 is connected to the collector and the emitter of the triode V31 to form the anti-parallel connection of the triode V31 and V32, and then in parallel with the linear resistor R21 connection. In this connection mode, the transistors V31 and V32 work in a critical saturation state. When combined with the linear resistor R31, it can not only improve the resolution of instantaneous small current signals, but also improve the anti-interference performance of small current signals, and it is also effective Reduce the voltage drop on the transistors V31 and V32 of the positive and negative half-wave high current signals of the alternating current, and effectively reduce the power loss of the sampling component when the current is high.

Example Embodiment

[0034] Example 3:
[0035] Please see Figure 5 , Non-linear current sampling components are formed by diodes. When used for non-linear sampling of AC current, the non-linear component (1) consists of two groups of diodes D1 and D2 connected in anti-parallel. The number of each group of diodes is related to the maximum value of the branch current and the rated current value of each diode. When the sampled branch current is small, D1 and D2 can be composed of one diode, and when the sampled branch current is large, D1 and D2 need to use multiple diodes in parallel in the same direction. When used for non-linear sampling of DC current, the non-linear component (1) only needs one group of diodes D1 or D2 to form. At this time, a group of diodes whose current direction when the diode is turned on is the same as that of the branch current is used. The compensation element (2) uses a linear resistor R1, which is connected in parallel to both ends of the non-linear component (1), and the voltage signal obtained thereby is sent to the current signal processing unit (3).

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