CN219268722U

CN219268722U - Energy supply circuit of laser for electronic current transformer

Info

Publication number: CN219268722U
Application number: CN202320145990.2U
Authority: CN
Inventors: 刘汉杰; 尹晓峰; 张建光; 张志浩; 苏青
Original assignee: Shandong United Power Industry Development Co ltd
Current assignee: Shandong United Power Industry Development Co ltd
Priority date: 2023-01-28
Filing date: 2023-01-28
Publication date: 2023-06-27
Anticipated expiration: 2033-01-28

Abstract

The utility model relates to an energy supply circuit of a laser for an electronic current transformer, which belongs to the technical field of power supply, and comprises a power supply module and an anti-magnetic interference module, wherein the anti-magnetic interference module comprises a plug, a magnetic ring, a filter unit and a voltage stabilizing diode D1, the power supply module is connected to the filter unit through the plug, connecting wires between the plug and the filter unit are wound on the magnetic ring, the filter unit is connected to two ends of the voltage stabilizing diode D1 in parallel, the positive electrode of the voltage stabilizing diode D1 is connected to an external power supply, and the negative electrode of the voltage stabilizing diode D1 is grounded; the influence of external environment on the energy supply module is eliminated through the magnetic ring, the laser can be stably supplied with power, the laser can be further used for stably supplying power to the electronic current transformer, the 12V power supply provided outside is filtered through the capacitor C1 and the capacitor C2, and the 12V power supply provided outside is stabilized through the voltage stabilizing diode D1, so that the electronic current transformer can stably work.

Description

Energy supply circuit of laser for electronic current transformer

Technical Field

The utility model belongs to the technical field of power supply, and particularly relates to an energy supply circuit of a laser for an electronic current transformer.

Background

The traditional current transformer principle is electromagnetic induction, a primary winding of the current transformer is connected in series in a power line, a measuring instrument or a relay protection and automatic control device is connected to an external loop of a secondary winding, and information is transmitted from a primary side to a secondary side by utilizing electromagnetic coupling between high-voltage windings and low-voltage windings. This construction requires an insulating layer of sufficient compressive strength between the core and the windings and between the primary and secondary windings to ensure that all low voltage devices are isolated from high voltages. Along with the increase of the power capacity transmitted by a power system, the voltage level is higher and higher, so that the insulation structure of the transformer is more and more complex, the volume and the weight are increased, and the manufacturing cost of the product is also higher and higher. For example, in a conventional oil immersed current transformer, the price of a 500kV product is doubled compared with the price of 300 kV. And because the iron core of the electromagnetic current transformer has saturation nonlinearity, when a short circuit fault occurs in the power system, the high-amplitude short circuit current enables the transformer to saturate and the output secondary current to be severely distorted, so that protection is refused, and serious accidents occur in the power system. The saturation of the transformer causes waveform distortion, and the transformer has a series of hidden troubles such as poor frequency band response characteristic, narrow frequency band and poor system high-frequency response, so that the realization of novel rapid protection based on high-frequency transient components is difficult. With the rapid development of optoelectronic technology, electronic current transformers, digital transformers or photoelectric transformers for short, have been developed which utilize a combination of optical sensing technology and electronics.

Because the electronic current sensor does not contain an iron core, the problems of magnetic saturation, ferromagnetic resonance and the like of the traditional current transformer are solved, the high voltage and the low voltage of the electronic current sensor can be completely isolated, the safety is higher, and the electronic current sensor has excellent insulating property, so that the electronic current sensor is gradually applied to various large fields. But the laser power supply module of the existing electronic current transformer also has corresponding problems, and the output end of the laser in the laser power supply frequently flashes due to certain magnetic interference in the environment where the product is located, so that the laser power supply cannot provide stable electric energy, the measurement accuracy of the electronic current transformer is affected, and the defect of the prior art is overcome.

In view of the above, the present utility model provides an energy supply circuit of a laser for an electronic current transformer; to solve the above-mentioned drawbacks of the prior art, it is highly desirable.

Disclosure of Invention

The utility model aims to provide a power supply circuit of a laser for an electronic current transformer, which aims at the defect that the electronic current transformer cannot accurately measure due to frequent flicker of an output end of the laser due to magnetic interference of an environment where a power supply module of the laser power supply of the electronic current transformer is positioned in the prior art, so as to solve the problems in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides an energy supply circuit of laser instrument for electronic type current transformer, including power module and anti-magnetic interference module, anti-magnetic interference module includes bayonet joint, magnetic ring, filter unit and zener diode D1, and power module passes through the bayonet joint to be connected to filter unit, and the wiring between bayonet joint and the filter unit is all the wiring on the magnetic ring, and filter unit connects in parallel to zener diode D1's both ends, and zener diode D1's positive pole is connected to external power source, zener diode D1's negative pole ground connection.

In one embodiment, the filtering unit includes a capacitor C1 and a capacitor C2, where the capacitor C1 and the capacitor C2 are connected in parallel, a first end of the capacitor C1 is connected to a first pin of the socket, a second end of the capacitor C2 is connected to a second pin of the socket, a first end of the capacitor C2 is connected to an external power source, and a second end of the capacitor C2 is grounded.

In one embodiment, the power module includes a power chip U1 and a capacitor C3, where a first pin and a second pin of the power chip U1 are grounded through the capacitor C3, and a third pin and a fourth pin of the power chip U1 are connected to the socket.

In one embodiment, power chip U1 employs a power chip model LO75_20B12.

In one embodiment, zener diode D1 is a zener diode model SMCJ 20A.

In one embodiment, the magnetic ring is a nickel zinc magnetic ring.

The utility model has the beneficial effects that the influence of the external environment on the energy supply module is eliminated through the magnetic ring, so that the energy supply module can stably supply power to the laser, the laser can stably supply power to the electronic current transformer, in addition, the 12V power supply provided by the outside is filtered through the capacitor C1 and the capacitor C2, the 12V power supply provided by the outside is stabilized through the voltage stabilizing diode D1, the power supply reliability is ensured, and the electronic current transformer can stably work.

In addition, the utility model has reliable design principle, simple structure and very wide application prospect.

It can be seen that the present utility model has outstanding substantial features and significant advances over the prior art, as well as its practical advantages.

Drawings

Fig. 1 is a schematic diagram of the present power supply circuit.

1 is a plug connector, and 2 is a magnetic ring.

Detailed Description

The present utility model will be described in detail below by way of specific examples with reference to the accompanying drawings, the following examples being illustrative of the present utility model and the present utility model is not limited to the following embodiments.

As shown in fig. 1, the utility model provides a power supply circuit of a laser for an electronic current transformer, which comprises a power supply module and an anti-magnetic interference module, wherein the anti-magnetic interference module comprises a plug, a magnetic ring, a filter unit and a voltage stabilizing diode D1, the power supply module is connected to the filter unit through the plug, the connecting wires between the plug and the filter unit are all wound on the magnetic ring, the filter unit is connected to two ends of the voltage stabilizing diode D1 in parallel, the positive electrode of the voltage stabilizing diode D1 is connected to an external power supply, and the negative electrode of the voltage stabilizing diode D1 is grounded. The voltage stabilizing diode D1 is a voltage stabilizing diode with the model number of SMCJ 20A; the magnetic ring adopts a nickel-zinc magnetic ring.

Specifically, the filtering unit includes a capacitor C1 and a capacitor C2, where the capacitor C1 and the capacitor C2 are connected in parallel, a first end of the capacitor C1 is connected to a first pin of the socket, a second end of the capacitor C2 is connected to a second pin of the socket, a first end of the capacitor C2 is connected to an external power source, and a second end of the capacitor C2 is grounded.

The power module comprises a power chip U1 and a capacitor C3, wherein a first pin and a second pin of the power chip U1 are grounded through the capacitor C3, and a third pin and a fourth pin of the power chip U1 are connected to the plug. The power chip U1 is a power chip of the model LO 75_20b12.

The foregoing disclosure is merely illustrative of the preferred embodiments of the utility model and the utility model is not limited thereto, since modifications and variations may be made by those skilled in the art without departing from the principles of the utility model.

Claims

1. The power supply circuit of the laser for the electronic current transformer is characterized by comprising a power supply module and an anti-magnetic interference module, wherein the anti-magnetic interference module comprises a plug, a magnetic ring, a filtering unit and a voltage stabilizing diode D1, the power supply module is connected to the filtering unit through the plug, wires between the plug and the filtering unit are all wound on the magnetic ring, the filtering unit is connected to two ends of the voltage stabilizing diode D1 in parallel, the anode of the voltage stabilizing diode D1 is connected to an external power supply, and the cathode of the voltage stabilizing diode D1 is grounded.

2. The power supply circuit of claim 1, wherein the filter unit comprises a capacitor C1 and a capacitor C2, the capacitor C1 and the capacitor C2 are connected in parallel, a first end of the capacitor C1 is connected to a first pin of the socket, a second end of the capacitor C2 is connected to a second pin of the socket, a first end of the capacitor C2 is connected to an external power source, and a second end of the capacitor C2 is grounded.

3. The power supply circuit of claim 1, wherein the power module comprises a power chip U1 and a capacitor C3, the first pin and the second pin of the power chip U1 are grounded through the capacitor C3, and the third pin and the fourth pin of the power chip U1 are connected to the socket.

4. A power supply circuit of a laser for an electronic current transformer according to claim 3, wherein the power supply chip U1 is a power supply chip of the type LO 75_20b12.

5. The power supply circuit of a laser for an electronic current transformer according to claim 1, wherein the zener diode D1 is a zener diode of the type SMCJ 20A.

6. The power supply circuit of a laser for an electronic current transformer according to claim 1, wherein the magnetic ring is a nickel-zinc magnetic ring.