CN203826194U

CN203826194U - Magnetic-balanced current transformer with digital interface

Info

Publication number: CN203826194U
Application number: CN201420204227.3U
Authority: CN
Inventors: 俞文荣; 黄志成; 王海荣; 张会龙
Original assignee: JIANGSU ACXION ELECTRIC CO Ltd
Current assignee: JIANGSU ACXION ELECTRIC CO Ltd
Priority date: 2014-04-25
Filing date: 2014-04-25
Publication date: 2014-09-10
Anticipated expiration: 2024-04-25

Abstract

The utility model relates to a magnetic-balanced current transformer with a digital interface, which comprises an iron core ring (2) sleeved on a current bus (1), wherein a gap is disposed on the ring body of the iron core ring (2), a Hall sensor (4) is embedded inside the gap, a coil (3) is winded on the iron core ring (2), the Hall sensor (4) is connected to one end of the coil (3), the other end of the coil (3) is grounded by a resistance (R), and a processing circuit is connected to the end of the resistance (R) far away from the grounding point. The magnetic-balanced current transformer with the digital interface in the utility model has high testing accuracy.

Description

A kind of magnetic balance type current transformer with digital interface

Technical field

The utility model relates to a kind of current transformer, especially relates to a kind of magnetic balance current transformer, and it has transmittability, belongs to technology of instrument and meter field.

Background technology

At present, conventional current transformer as shown in Figure 2, in its gap of opening, a Hall element is set on iron core, utilize this Hall element that the current signal recording is sent by communicating circuit after treatment, as Chinese patent ZL201320308282.2 " a kind of electric mutual inductor based on electricity anti-theft system ", owing to adopting iron core, inevitably there is the problems such as magnetic saturation, ferromagnetic resonance and magnetic hysteresis in it, have a strong impact on the precision of test, and its transmittability is effective, cannot carry out long-distance transmissions.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned deficiency, and the magnetic balance type current transformer with digital interface that a kind of measuring accuracy is high is provided.

The purpose of this utility model is achieved in that a kind of magnetic balance type current transformer with digital interface, described current transformer includes the iron core ring being set on current bus bar, on the ring body of described iron core ring, have a breach, there is a Hall element to be embedded in this breach, on described iron core ring, be wound with a coil, described Hall element is connected with one end of above-mentioned coil, the other end resistance grounded of described coil, and above-mentioned resistance is away from one end access treatment circuit of earth point.

A kind of magnetic balance type current transformer with digital interface of the utility model, described treatment circuit includes I/V modular converter, the input of I/V modular converter accesses above-mentioned resistance away from one end of earth point, the output access microprocessor of I/V modular converter, the output of I/V modular converter is also connected with the input of V/F modular converter, the output access microprocessor of described V/F modular converter, described microprocessor is connected with a communication module.

A kind of magnetic balance type current transformer with digital interface of the utility model, described communication module is RS485 module.

A kind of magnetic balance type current transformer with digital interface of the utility model, above-mentioned microprocessor is the KL06 series monolithic that Freescale company produces.

Compared with prior art, the beneficial effects of the utility model are:

The utility model cancels out each other the magnetic field in iron core by the mode of magnetic balance, thereby improved the precision of measuring, and carried out communication by RS485 module, communication distance can length more than 1 kilometer, greatly improve its transmission range, be convenient to carry out remote monitoring.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of magnetic balance type current transformer with digital interface of the utility model.

Fig. 2 is the structural representation of conventional current transformer.

Fig. 3 is a kind of circuit diagram of the signal conditioning circuit of a kind of magnetic balance type current transformer with digital interface of the utility model.

Wherein:

Current bus bar 1, iron core ring 2, coil 3, Hall element 4.

Embodiment

Referring to Fig. 1, a kind of magnetic balance type current transformer with digital interface that the utility model relates to, described current transformer includes the iron core ring 2 being set on current bus bar 1, on the ring body of described iron core ring 2, have a breach, there is a Hall element 4 to be embedded in this breach, the effect that is wound with this coil 3 of coil 3(on described iron core ring 2 is---the contrary magnetic field of magnetic direction producing with current bus bar 1 in the interior generation one of iron core ring 2, thereby cancelled out each other in two magnetic fields, eliminated the various adverse effects that bring in magnetic field---concretely, Hall element 4 is according to the size in magnetic field, obtain a signal that is proportional routine relation, this signal is through coil generation one and current bus bar equal and opposite in direction, the magnetic field of opposite direction), described Hall element 4 is connected (preferred with one end of above-mentioned coil 3, Hall element 4 adopts linear hall sensor chip A1326, and one end of this Hall element 4 switch-on coil 3 after signal conditioning circuit, for the electric current of input coil is regulated---this signal conditioning circuit can adopt arbitrary form, as announced in Chinese patent ZL201110172040.0 " current sensor ", adopt operational amplifier, or also can adopt operational amplifier and the Darlington transistor circuit that cascade forms to pipe---as shown in Figure 3), the other end of described coil 3 is through resistance R ground connection, and above-mentioned resistance R is away from one end access treatment circuit of earth point,

Described treatment circuit includes I/V modular converter, the input of I/V modular converter accesses above-mentioned resistance R away from one end of earth point, the output access microprocessor of I/V modular converter, thus after making to convert voltage signal to by the current signal obtaining in resistance R, pass to microprocessor; The output of I/V modular converter is also connected with the input of V/F modular converter, the output access microprocessor of described V/F modular converter, V/F modular converter is for converting voltage signal to frequency signal, above-mentioned microprocessor is the KL06 series monolithic that Freescale company produces, and microprocessor output is transferred to remote terminal through communication module (RS485 module); Microprocessor obtains after voltage, frequency signal, by A/D, change, the hardware platforms such as frequency acquisition and Fourier calculate to draw the parameters such as real effective in current signal, harmonic frequency, fundamental frequency, microprocessor above-mentioned is treated to the function that this series unit has, the common practise that belongs to those skilled in the art, not the protection point of this patent; The innovative point of this patent is, by the magnetic balance mode of coil 3, obtains stable, accurate collection signal; And monitor by long Distance Transmission to the remote terminal of RS485 module.

In addition: it should be noted that above-mentioned embodiment is only a prioritization scheme of this patent, any change that those skilled in the art does according to above-mentioned design or improvement are all within the protection range of this patent.

Claims

1. the magnetic balance type current transformer with digital interface, described current transformer includes the iron core ring (2) being set on current bus bar (1), on the ring body of described iron core ring (2), have a breach, have a Hall element (4) to be embedded in this breach, it is characterized in that:

On described iron core ring (2), be wound with a coil (3), described Hall element (4) is connected with one end of above-mentioned coil (3), the other end of described coil (3) is through resistance (R) ground connection, and above-mentioned resistance (R) is away from one end access treatment circuit of earth point.

2. a kind of magnetic balance type current transformer with digital interface as claimed in claim 1, it is characterized in that: described treatment circuit includes I/V modular converter, the input of I/V modular converter accesses above-mentioned resistance (R) away from one end of earth point, the output access microprocessor of I/V modular converter, the output of I/V modular converter is also connected with the input of V/F modular converter, the output access microprocessor of described V/F modular converter, described microprocessor is connected with a communication module.

3. a kind of magnetic balance type current transformer with digital interface as claimed in claim 2, is characterized in that: described communication module is RS485 module.

4. a kind of magnetic balance type current transformer with digital interface as described in claim 1,2 or 3, is characterized in that: above-mentioned microprocessor is the KL06 series monolithic that Freescale company produces.