CN210925707U

CN210925707U - High-impedance autotransformer

Info

Publication number: CN210925707U
Application number: CN201922466257.7U
Authority: CN
Inventors: 徐启惠; 朱海超; 曹仲飞; 王甫新
Original assignee: Tefu Mike Shanghai Uninterruptible Power Supply System Magnetic Components Co ltd; Zhejiang Yilanke Power Electronics Technology Co ltd; SHANGHAI INDUCTEK POWER ELECTRONICS EQUIPMENT Ltd
Current assignee: Tefu Mike Shanghai Uninterruptible Power Supply System Magnetic Components Co ltd; Zhejiang Yilanke Power Electronics Technology Co ltd; SHANGHAI INDUCTEK POWER ELECTRONICS EQUIPMENT Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-07-03
Anticipated expiration: 2029-12-31

Abstract

The utility model relates to a power electronic equipment technical field. The high-impedance autotransformer can meet the power supply requirements of a gas discharge lamp with high starting voltage and large working voltage at two ends of a lamp tube after continuous lighting, realizes the functions of high and stable initial value of output voltage, and the output voltage can be reduced along with the increase of load current, and has the advantages of small volume, light weight, simple structure and low manufacturing cost. The method comprises the following steps: an upper iron yoke, a lower iron yoke, two main iron core columns and an auxiliary iron core column; no coil is wound on the auxiliary iron core column, a coil is wound on each main iron core column respectively, one coil is connected to a power supply, and the other coil is connected with the previous coil in series and then connected to a load; air gaps are not arranged at the joints of the two main iron core columns and the upper and lower iron yokes, and air gaps are arranged at the joints of the auxiliary iron core columns and the upper and lower iron yokes.

Description

High-impedance autotransformer

Technical Field

The utility model relates to a power electronic equipment technical field particularly, relates to a high impedance autotransformer.

Background

A gas discharge lamp is an electric light source that converts electric energy into light by gas discharge, and is a lamp that emits light by discharge of a gas, metal vapor, or a mixture of several gases and metal vapor. Gas discharge lamps are used in a wide range of applications, including industrial, agricultural, medical and health, and scientific research fields, and besides as illumination light sources, gas discharge lamps are used in photography, projection, blueprinting, photocopying, photolithography, chemical synthesis, aging of plastics and rubber, fluorescence microscopy, optical oscilloscopes, fluorescence analysis, ultraviolet inspection, sterilization, medical treatment, biological culture, and solid laser.

With the development of new technologies, the application field of gas discharge lamps is further expanding. For example, in a water treatment apparatus, a gas discharge lamp is used whose starting voltage is higher than that commonly used in an industrial power distribution system, so that a boosting device is required. The existing solution is to use a ballast to boost the voltage, but the output voltage of the ballast is unstable, which is not favorable for prolonging the service life of the lamp tube. In addition, the lamp tubes of such gas discharge lamps are relatively expensive to manufacture, and the starting voltage is boosted by using the existing ballast device, which is not favorable for prolonging the service life of the lamp tubes, and therefore, higher economic loss is generated.

In addition, different from the common gas discharge lamps, the working voltage of the gas discharge lamps is lower than the power supply voltage in an industrial power distribution system (namely, the working voltage is lower than 400V), and for most common gas discharge lamps, the working voltage of a low-power lamp tube is only dozens of volts, and the high-power lamp tube has 100-200V. The gas discharge lamp used in the water treatment equipment has an operating voltage of about 600V higher than the power supply voltage when the gas discharge lamp enters the continuous light emission after being started.

Therefore, it is necessary to develop a transformer suitable for the characteristics of high starting voltage of the gas discharge lamp, large operating voltage at both ends of the lamp tube after continuous light emission, and large operating current.

SUMMERY OF THE UTILITY MODEL

The utility model aims at adapting to new application needs, overcoming the weak point among the existing equipment, providing a high impedance autotransformer, can satisfy the power supply requirement that the operating voltage at the fluorescent tube both ends after the start voltage is high, continuously give out light, realize that output voltage initial value is high and stable to output voltage can be along with the function that load current's increase and descend again, and has advantages small, light in weight, simple structure, cost hang down.

The purpose of the utility model is realized like this:

a high impedance autotransformer comprising: an upper yoke, a lower yoke, two main legs and an auxiliary leg.

Two main iron core columns set up between upper yoke and lower yoke, and it has a coil to wind respectively on every main iron core column to one of them main iron core column is first main iron core column, another main iron core column is the main iron core column of second, coil on the first main iron core column is connected to the power, coil on the main iron core column of second is connected to the load after establishing ties with the coil of first main iron core column. Air gaps are not arranged on the two main iron core columns and at the joints of the two main iron core columns and the upper and lower iron yokes.

The auxiliary iron core column is arranged on the side edges of the upper iron yoke and the lower iron yoke and connected with the upper iron yoke and the lower iron yoke, or the auxiliary iron core column is arranged between the upper iron yoke and the lower iron yoke and connected with the upper iron yoke and the lower iron yoke. And no coil is wound on the auxiliary iron core column, and air gaps are arranged at the joints of the auxiliary iron core column and the upper and lower iron yokes.

When exciting current is conducted in the coil on the first iron core column, magnetic flux is generated and forms a main magnetic flux loop and an auxiliary magnetic flux loop, the magnetic flux forms the main magnetic flux loop through the first main iron core column, the upper iron yoke, the second main iron core column, the lower iron yoke and the first main iron core column, and the magnetic flux forms the auxiliary magnetic flux loop through the first main iron core column, the upper iron yoke, the auxiliary iron core column, the lower iron yoke and the first main iron core column. The magnetic resistance of the auxiliary magnetic flux loop is larger than that of the main magnetic flux loop because the air gap is arranged at the connecting part between the auxiliary iron core column and the upper and lower iron yokes.

When the gas discharge lamp is not connected with the power supply, the transformer is in a no-load state, the output voltage of the transformer is close to the no-load voltage, and the output voltage of the transformer is higher at the moment. Therefore, when the gas discharge lamp is just started after being connected with the power supply, the transformer can provide a stable starting voltage with a high initial value, so that the working characteristic that the input voltage is required to be high when the gas discharge lamp is just started is met, and the phenomenon that the lamp tube is damaged or the service life of the lamp tube is influenced due to overvoltage is avoided. After the lamp is started and continuously emits light, the current passing through the lamp tube is increased due to the fact that the impedance in the lamp tube is small and the working voltages at two ends are low. At this time, the secondary core limb provides a shunt magnetic flux loop, and when the load current (i.e. the current passing through the lamp tube) increases, the input current also increases correspondingly; meanwhile, the increased input current generates voltage drop in the input circuit due to the existence of the auxiliary core limb loop, similarly to the situation that a voltage division reactor is connected in series in the input circuit, the higher the input current is, the ultrahigh voltage is obtained on the reactor, which is equivalent to the reduction of the input voltage, so that the induction voltage of the coil on the second core limb is also lowered; in this way, the total output voltage of the transformer is also lowered to meet the operating requirements of the gas discharge lamp.

The utility model provides an adopt above-mentioned technical scheme's high impedance autotransformer compares with prior art, and the structure is simpler, and consequently also the volume is littleer, weight is lighter, and the cost is low, but can realize that output voltage initial value is high and stable to output voltage can be along with the function that load current's increase and descend again, satisfies the power supply requirement of this type of gas discharge lamp that operating voltage is higher than mains voltage, thereby guarantees gas discharge lamp's stable start and follow-up work. And the utility model has the advantages of small volume, light weight, simple structure and low cost.

Drawings

Further advantages and features of the invention are illustrated by the following description of an embodiment of the invention, given by way of example and not by way of limitation, with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural diagram of a first embodiment of the high impedance autotransformer of the present invention.

Fig. 2 is a top view (schematic) of the embodiment shown in fig. 1.

Fig. 3 is a schematic view of the magnetic flux circuit of the embodiment shown in fig. 1.

Fig. 4 is a schematic structural diagram of a second embodiment of the high impedance autotransformer of the present invention.

Fig. 5 is a top view (schematic) of the embodiment shown in fig. 4.

Fig. 6 is a schematic view of the magnetic flux circuit of the embodiment shown in fig. 4.

Detailed Description

A high impedance autotransformer as shown in figures 1-2 comprising: an upper yoke 1, a lower yoke 3, a first main leg 21, a second main leg 22 and an auxiliary leg 23. As shown from left to right in the figure, there are sequentially an auxiliary leg iron 23, a first main leg iron 21 and a second main leg iron 22, the auxiliary leg iron 23 is disposed at the side of the upper and

lower yokes

1 and 3 and connects the upper and lower yokes, and the first and second

main leg iron

21 and 22 are both disposed between the upper and

lower yokes

1 and 3.

A coil 4 is wound on each of the first main core limb 21 and the second main core limb 22, the coil 4 on the first main core limb 21 is connected with an input end and connected to a power supply, and the coil 4 on the second main core limb 22 is connected with the coil 4 of the first main core limb 21 in series and then connected with an output end and connected to a load. No coil is wound on the auxiliary core limb 23, and air gaps 5 are arranged at the joint of the auxiliary core limb 23 and the upper yoke 1 and the joint of the auxiliary core limb 23 and the lower yoke 3.

As shown in fig. 3, when an exciting current is supplied to the coil 4, a magnetic flux is generated. A main flux loop is formed by magnetic flux passing through the first main leg iron 21, the upper yoke 1, the second main leg iron 22, the lower yoke 3, and the first main leg iron 21; the magnetism passes through the first main core limb 21, the upper iron yoke 1, the auxiliary core limb 23, the lower iron yoke 3 and the first main core limb 21 to form an auxiliary magnetic path loop.

The above embodiment is a preferred embodiment of the present invention. The position between the core legs is adjustable. In another embodiment as shown in fig. 4-5, the high impedance autotransformer comprises: an upper yoke 1, a lower yoke 3, a first main leg 21, a second main leg 22 and an auxiliary leg 23. As shown from left to right in the figure, there are a first main leg core 21, a sub-leg core 23, and a second main leg core 22 in this order. In the present embodiment, the first main leg 21, the second main leg 22, and the sub-leg 23 are each disposed between the upper yoke 1 and the lower yoke 3. Each main core leg is wound with a coil 4, the coil 4 of the first main core leg 21 is connected to a power supply, and the coil 4 of the second main core leg 22 is connected in series with the coil 4 of the first main core leg 21 and then connected to a load. No coil is wound on the auxiliary core limb 23, and air gaps 5 are arranged at the joint of the auxiliary core limb 23 and the upper yoke 1 and the joint of the auxiliary core limb 23 and the lower yoke 3.

As shown in fig. 6, when an exciting current is supplied to the coil 4, a magnetic flux is generated. A main flux loop is formed by magnetic flux passing through the first main leg iron 21, the upper yoke 1, the second main leg iron 22, the lower yoke 3, and the first main leg iron 21; the magnetism passes through the first main core limb 21, the upper iron yoke 1, the auxiliary core limb 23, the lower iron yoke 3 and the first main core limb 21 to form an auxiliary magnetic path loop.

Although the present invention has been described in terms of the preferred embodiments, it is not intended that the scope of the invention be limited to the exact construction and arrangement shown and described, and it is intended that all equivalent alterations and modifications that can be devised readily by those skilled in the art based on the foregoing description be embraced by the scope of the invention.

Claims

1. A high impedance autotransformer, comprising: an upper yoke, a lower yoke, two main legs and an auxiliary leg;

the two main iron core columns are arranged between an upper iron yoke and a lower iron yoke, a coil is wound on each main iron core column respectively, one main iron core column is taken as a first main iron core column, the other main iron core column is taken as a second main iron core column, the coil on the first main iron core column is connected to a power supply, and the coil on the second main iron core column is connected with the coil of the first main iron core column in series and then connected to a load;

air gaps are not arranged on the two main iron core columns and the joints of the two main iron core columns and the upper and lower iron yokes,

the auxiliary core limb is arranged on the side edges of the upper iron yoke and the lower iron yoke and connected with the upper iron yoke and the lower iron yoke, or the auxiliary core limb is arranged between the upper iron yoke and the lower iron yoke and connected with the upper iron yoke and the lower iron yoke;

no coil is wound on the auxiliary iron core column, and air gaps are arranged at the joints of the auxiliary iron core column and the upper and lower iron yokes;

when exciting current is conducted in a coil on the first iron core column, magnetic flux is generated and forms a main magnetic flux loop and an auxiliary magnetic flux loop, the magnetic flux forms the main magnetic flux loop through the first main iron core column, the upper iron yoke, the second main iron core column, the lower iron yoke and the first main iron core column, and the magnetic flux forms the auxiliary magnetic flux loop through the first main iron core column, the upper iron yoke, the auxiliary iron core column, the lower iron yoke and the first main iron core column;

the reluctance of the secondary magnetic flux loop is greater than the reluctance of the primary magnetic flux loop.