KR20170055890A

KR20170055890A - High voltage power supply

Info

Publication number: KR20170055890A
Application number: KR1020150159226A
Authority: KR
Inventors: 장성록; 김종수; 류홍제; 서정호; 안석호
Original assignee: 한국전기연구원
Priority date: 2015-11-12
Filing date: 2015-11-12
Publication date: 2017-05-22

Abstract

Disclosed is a high voltage power apparatus. The present invention can output high voltage while maintaining insulation between transformer winding wires by dividing the transformer into a plurality of transformers and connecting output of the transformer in series instead of winding the winding wires of the transformer into a plurality of layers to boost voltage. Particularly, in order to solve a problem that output voltage of each transformer is uneven due to different leakage inductance of the plurality of transformers, the present invention can uniformly adjust voltage induced in a secondary winding wire of each transformer by winding cores of adjacent transformers together with a tertiary winding wire.

Description

{High voltage power supply}

The present invention relates to a high voltage power supply, and more particularly to a high voltage power supply including a transformer.

Transformer refers to a device that changes the value of AC voltage or current by using electromagnetic induction phenomenon.

In the case of a direct current / direct current (DC / DC) converter having a structure for boosting using such a transformer, the transformer can be saturated by the operating frequency and the voltage applied to the primary side of the transformer.

The term "saturation of a transformer" means that when the iron is magnetized, the magnetic flux density generally increases as the magnetizing force increases. However, when the magnetization increases, the magnetic flux density hardly increases even when the magnetizing force increases. In addition, the saturation phenomenon of the transformer generates harmonics, thereby causing malfunctions in peripheral devices, shortening the life span, or generating vibration in the transformer. Also, if the transformer is saturated, it can no longer function as a transformer, and the desired voltage of the secondary side of the transformer can not be obtained.

In order to prevent the saturation phenomenon of such a transformer, there is a method of increasing the magnetizing inductance by increasing the number of primary windings of the transformer. However, if the number of primary windings of the transformer is increased, the number of secondary windings must be increased in proportion to the increased number of primary windings to maintain the same boost ratio.

As a result, in order to design a high-voltage transformer that outputs a stable output while preventing saturation, it is necessary to use a minimum primary winding for preventing saturation with a ratio of primary and secondary windings to maintain the same boost ratio, The insulation between the secondary windings and the interlaminar insulation of the secondary windings in accordance with the increased primary winding ratio shall be considered together.

Fig. 1 is a view showing a structure of a conventional transformer designed in this manner.

The transformer of FIG. 1 includes a core 110, a primary winding (not shown since it is wound on the core inside the bobbin) wound around the core 110, a bobbin 130 made of an insulating material such as Teflon, And a secondary winding 140 wound on the secondary winding 140. The transformer is connected to the support base 160 by fastening means such as a bolt 170, and a bus bar 150 may be provided around the transformer.

Figure 2 is a side view of the conventional transformer of Figure 1;

In the conventional transformer, a method of winding the secondary winding 140 on the bobbin 130 is generally a method of raising the winding area by extending the core. That is, in order to prevent saturation of the transformer, the number of windings of the primary winding is increased and the number of windings of the secondary winding 140 is increased in proportion thereto. Therefore, the size of the core is further increased to provide such a space.

However, this method has a problem in that the volume of the transformer becomes large and the unit price at the time of manufacturing the transformer increases.

In general, if a higher step-up ratio is required in the transformer, the secondary winding should be wound on the bobbin with a greater number of turns relative to the number of primary turns. Also, if the number of primary windings increases to prevent saturation, the number of secondary windings must also increase. Therefore, if the secondary winding can not be wound in one layer, the secondary winding must be wound on the bobbin in two or more layers.

However, since the interlayer insulation between the secondary windings must be considered, the area of the secondary winding that can be wound on one layer is continuously reduced as the number of layers of the secondary winding wound on the bobbin increases.

3 is a view showing a conventional method of winding a secondary winding in consideration of interlayer insulation in a bobbin of a transformer.

In the conventional method of winding the secondary winding of the high voltage transformer, the secondary winding is first wound around the bobbin 130 in the direction of arrow '1'. When the secondary winding is wrapped in the direction of arrow '1', it reaches the end of the bobbin 130, and the next layer winds the secondary winding in the direction of the arrow '2'.

However, when the winding is wound up to the end of the bobbin in the direction of the arrow "2" in the next layer, it comes into contact with the first winding portion of the first winding layer, and eventually comes to the beginning of the first winding layer There is a large voltage difference between the wound portion wound and the winding portion wrapped along the '2' arrow.

Therefore, in order to ensure the interlaminar insulation between the secondary windings, as shown in the drawing in the next winding layer, the 'A' portion is left empty and the winding is wound along the arrow '3'.

When this process is repeated and the secondary winding is wound on the bobbin 130 along the '3' arrow and then reaches the 'B' portion again, the 'B' portion is emptied The secondary winding of the next layer is wound in the direction of the arrow '4'.

However, if the secondary winding is wound around the bobbin 130 by the secondary winding in this manner, the shape of the secondary winding wound around the bobbin 130 is inevitably made up of a bulged shape in the middle of the bobbin 130 , It is not possible to maintain an appropriate insulation distance between the secondary winding of the transformer and the increase in volume of the transformer. In addition, as the number of the secondary windings increases, the number of windings that can be wound is limited, .

A problem to be solved by the present invention is to provide a high-voltage power supply apparatus capable of securing insulation between transformer windings.

According to an aspect of the present invention, there is provided a high voltage power supply apparatus including: a plurality of transformers each having a primary side winding connected in series to each other; A plurality of rectifying units connected to the secondary windings of the plurality of transformers to convert AC power output from the plurality of transformers into DC power; A plurality of capacitors connected to the plurality of rectifying sections to charge the voltage output from the rectifying section; And at least one tertiary winding wound together with the cores of the different transformers to uniformly adjust the charging voltages of the plurality of capacitors to each other.

In addition, the tertiary windings of the high voltage power supply according to another preferred embodiment of the present invention may be wound together with the cores of two physically adjacent transformers.

The plurality of capacitors of the high voltage power supply according to another preferred embodiment of the present invention may be connected in series with each other, and the summed voltage value of the charge voltages of the respective capacitors may be output to the load side.

The high voltage power supply apparatus according to another preferred embodiment of the present invention may further include a voltage measuring unit installed at an output terminal of the serially connected capacitors and measuring whether an overvoltage is output.

In the high voltage power supply apparatus according to another preferred embodiment of the present invention, a load is connected to the output terminal of the series-connected capacitors, a shunt resistor is inserted between the load and the series-connected capacitors, And a current measuring unit for measuring the overcurrent using the current measuring unit.

The high voltage power supply apparatus according to another preferred embodiment of the present invention further includes a zener diode connected between one end of the series connected capacitor and the ground to protect the high voltage power supply device from an overvoltage generated by a malfunction .

Further, the cores of the plurality of transformers of the high-voltage power supply according to another preferred embodiment of the present invention may be manufactured in a toroidal shape so that the primary windings can be simultaneously connected through the toroidal-shaped cores.

The present invention can output a high voltage while maintaining insulation between transformer windings by dividing the transformer into a plurality of transformers and connecting the outputs of the transformers in series instead of winding the transformer windings in multiple layers for boosting.

In particular, in order to solve the problem that the output voltage of each transformer becomes uneven due to different leakage inductances of a plurality of transformers, by winding the third-side winding together with the cores of adjacent transformers, Can be adjusted uniformly.

1 is a view showing a structure of a conventional transformer.
Figure 2 is a side view of the conventional transformer of Figure 1;
3 is a view showing a conventional method of winding a secondary winding in consideration of interlayer insulation in a bobbin of a transformer.
4 is a circuit diagram showing a configuration of a high-voltage power supply device according to a preferred embodiment of the present invention.
5 is a diagram showing an example of a high voltage power supply apparatus implemented according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

4 is a circuit diagram showing a configuration of a high-voltage power supply device according to a preferred embodiment of the present invention.

4, the high voltage power supply according to the present invention includes a DC / AC inverter 200, a plurality of transformers 310 to 380 in which primary windings 311 to 381 are connected in series, a plurality of transformers 310 to 380 A plurality of rectifying sections 410 to 480 connected to the secondary windings 312 to 382 of the transformer 310 to 380 for converting AC power outputted from the plurality of transformers 310 to 380 into DC power, A plurality of capacitors 510 to 580 connected to the rectifying units 410 to 480 to charge the voltage output from the rectifying units 410 to 480 and outputting the voltages to the load 1000 and the plurality of capacitors 510 to 580 wound together with the cores of the different transformers, And at least one tertiary winding (610, 620, ...) for uniformly regulating charging voltages to each other.

In this case, the number of turns of the primary windings 311 to 381 included in the plurality of transformers 310 to 380 are all the same, the turns of the secondary windings 312 to 382 are all the same, It should be noted that the number of turns wound on each transformer of the windings 610, 620, ... is the same.

The plurality of capacitors 510 to 580 of the present invention are connected in series with each other. Accordingly, the summed voltage value of the charging voltage of each of the capacitors 510 to 580 is outputted to the load 1000 side, so that the high voltage power supply can be provided to the load 1000. [

In addition, the high voltage power supply apparatus of the present invention includes a voltage measuring unit 710 for detecting an overvoltage. 4, the voltage measuring unit 710 includes a plurality of RCs (not shown) connected in series to each other, and the voltage measuring unit 710 is connected to the output terminals of the capacitors 510 to 580. [ The voltage applied to the last resistor 700-RC of the plurality of RC voltage dividers 700-1 to 700-N, which is implemented by the voltage divider 700-1 to 700-N, Can be measured.

The high voltage power supply of the present invention further includes a shunt resistor 800 inserted between the load 1000 connected to the output terminal of the capacitors 510 to 580 connected in series and the capacitors 510 to 580 connected in series, And a current measuring unit 810 for measuring a current using the current measuring unit 810 to detect whether an overcurrent flows.

In addition, the high voltage power supply apparatus of the present invention is installed between one end of the capacitors 510 to 580 connected in series with a zener diode 900 for protecting the high voltage power supply device from an overvoltage generated by a malfunction, and the ground.

Hereinafter, the operation of the high voltage power supply according to the preferred embodiment of the present invention will be described. The DC / AC inverter 200 of the present invention changes the input DC power to AC and outputs the DC power to the plurality of transformers 310 to 380 . One of the two terminals on the output side of the DC / AC inverter 200 is connected to the primary terminal of the first transformer 310 and the other terminal is connected to the primary terminal of the eighth transformer 380.

In the example shown in FIG. 4, the high voltage power supply of the present invention is shown as composed of eight transformers, but the number of transformers is not limited to two or more. As shown in FIG. 4, the primary windings 311 to 381 of the plurality of transformers 310 to 380 of the present invention are connected in series to each other. Therefore, when the DC / AC inverter 200 outputs a current to the primary winding 311 of the first transformer 310, the output current flows from the primary winding of the second transformer 320 to the eighth transformer 380, (321 to 381).

The currents flowing along the primary windings 311 to 381 of the first to eighth transformers 310 to 380 cause the secondary windings 312 to 382 of the first to eighth transformers 310 to 380, ) And the tertiary windings 610, 620, ... in order.

The AC power induced in the secondary windings 312 to 382 of the plurality of transformers 310 to 380 is input to the rectification sections 410 to 480 respectively and the rectification sections 410 to 480 convert the AC power induced in the secondary side into direct current And outputs the converted direct current power to the plurality of capacitors 510 to 580, respectively.

At this time, leakage inductances 315 to 385 are generated in the respective transformers 310 to 380. The difference of the leakage inductances 315 to 385 generated in each of the transformers 310 to 380 is transmitted to the rectifying sections 410 to 480 The difference in magnitude of the input AC power and the difference in magnitude of the charging voltage charged in each of the capacitors 510 to 580.

The voltage imbalance of each of the transformers 310 to 380 not only hinders the power conversion efficiency but also affects the capacitors 510 to 580 by applying an overvoltage exceeding the rating of each of the capacitors 510 to 580 to the capacitors 510 to 580, The reliability of the entire high-voltage power supply can be impaired.

Accordingly, as described above, according to the present invention, since the tertiary windings 610, 620, ... are wound together with the cores of the different transformers to uniformly adjust the voltage induced in the secondary windings 312 to 382, The charging voltages of the plurality of capacitors 510 to 580 are uniformly adjusted.

4, when the number of turns of the secondary windings 312 and 322 of the first transformer 310 and the second transformer 320 is 100 and the number of turns of the first transformer 310 and the second transformer 320 is 100, The number of turns of the winding portion 610a wound on the core of the first transformer 310 and the number of turns of the winding portion 610b wound on the core of the second transformer 320 of the tertiary winding 610 co- I suppose.

At this time, although a current of the same magnitude flows in the primary side of the first transformer 310 and the second transformer 320, the difference between the leakage inductances 315 and 325 of the first transformer 310 and the second transformer 320 Assuming that a voltage of 100 V is induced in the secondary side 312 of the first transformer 310 and a voltage of 80 V is induced in the secondary side 322 of the second transformer 320, 1V is induced in the portion 610a wound on the core of the first transformer 310 of the winding 610 and 0.8V is induced in the portion 610b wound on the core of the second transformer 320. [

As shown in the drawing, the tertiary winding 610 is commonly wound around the cores of the first transformer 310 and the second transformer 320, and is wound around the core 610a of the first transformer 310, The portion 610a wound on the core of the first transformer 310 of the tertiary winding 610 due to the voltage difference is generated because the voltage applied to the first transformer 310 is larger than the voltage induced in the portion 610b wound around the core of the second transformer 320, The current flows to the portion 610b wound around the core of the second transformer 320. [ At this time, a current flowing from the dot of the portion 610a wound on the core of the first transformer 310 of the tertiary winding 610 is applied to the dot of the portion 610b wound around the core of the second transformer 320 The magnetic flux of the first transformer 310 is weakened so that the voltage induced in the secondary winding 312 of the first transformer 310 is reduced and the magnetic flux of the second transformer 310 is reduced, The voltage induced in the secondary winding 322 of the second transformer 320 is increased.

This process continues until there is no potential difference induced in the portion 610a wound around the core of the first transformer 310 and the portion 610b wound around the core of the second transformer 320 of the tertiary winding 610, The magnitude of the voltage induced in the secondary winding 312 of the first transformer 310 and the secondary winding 312 of the second transformer 320 and the magnitude of the charging voltage charged in the capacitors 510 and 520 become equal .

On the other hand, another tertiary winding 620 is wound together between the second transformer 320 and the third transformer 330. Therefore, when a potential difference is generated between the voltage induced in the secondary winding 322 of the second transformer 320 and the voltage induced in the secondary winding 332 of the third transformer 330,

A potential difference is generated between the voltage induced in the portion 620a wound around the core of the second transformer 320 and the voltage induced in the portion 620b wound around the core of the third transformer 330 of the tertiary winding 620, The magnetic flux of the transformer having a large magnitude of the induced voltage is reduced due to the current, and the induced voltage is decreased. The flux of the transformer having the small induced voltage is increased to increase the induced voltage.

This process continues until there is no potential difference induced in the tertiary winding 620 of the second transformer 320 and the third transformer 330 and accordingly the secondary winding 322 of the second transformer 320 And the magnitude of the voltage induced in the secondary winding 332 of the third transformer 330 and the magnitude of the charging voltage charged in the capacitors 520 and 530 are the same.

The voltage induced in the secondary windings 312 to 382 of the first transformer 310 to the eighth transformer 380 and the charging voltage of the capacitors 510 to 580 become uniform by the above process.

In the example shown in Fig. 4, the tertiary windings are illustrated as being wound together between two physically adjacent transformers, but this is for design convenience only, and the tertiary windings between the physically adjacent transformers must be wound together It should not be.

5 is a diagram showing an example of a high voltage power supply apparatus implemented according to a preferred embodiment of the present invention.

4, eight transformers are connected in series to constitute an entire high voltage power supply. The core of the plurality of transformers 310 to 380 is a toroidal transformer as shown in FIG. ). As shown in FIG. 5, when the cores of a plurality of transformers are formed in a toroidal shape, the primary windings 311 to 381 can be connected to the toroidal cores at the same time through the cores.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

200: DC / AC inverter
310 to 380: First to eighth transformers
311 to 381: Primary winding 312 to 382: Secondary winding
315 to 385: Leakage inductance 410 to 480:
510 to 580: capacitors 610, 620, ...: tertiary winding
700-1 to 700-N: RC voltage divider 710: voltage measuring unit
800: Shunt resistor 810: Current measuring unit
1000: Load

Claims

A plurality of transformers in which the primary windings are connected in series with each other;
A plurality of rectifying units connected to the secondary windings of the plurality of transformers to convert AC power output from the plurality of transformers into DC power;
A plurality of capacitors connected to the plurality of rectifying sections to charge the voltage output from the rectifying section; And
And at least one tertiary winding wound together with the cores of the different transformers to uniformly charge voltages of the plurality of capacitors with respect to each other.

The method according to claim 1,
Wherein the tertiary windings are wound together on the cores of two physically adjacent transformers.

The method according to claim 1,
Wherein the plurality of capacitors are connected in series to each other, and the summed voltage value of the charge voltage of each capacitor is output to the load side.

The method of claim 3,
And a voltage measuring unit installed at an output terminal of the series-connected capacitors to measure whether an overvoltage is output.

The method of claim 3,
A load is connected to the output terminal of the series-connected capacitors, a shunt resistor is inserted between the load and the series-connected capacitors,
And a current measuring unit for measuring an overcurrent using the shunt resistor.

The method of claim 3,
And a zener diode connected between one end of the series-connected capacitor and the ground to protect the high voltage power supply device from an overvoltage generated by a malfunction.

The method according to claim 1,
Wherein the cores of the plurality of transformers are formed in a toroidal shape so that the primary windings are simultaneously connected through the toroidal shaped cores.