CN217562381U - Polycrystalline silicon converter transformer and control system - Google Patents

Abstract

The utility model provides a polycrystalline silicon converter transformer and control system, polycrystalline silicon converter transformer includes three-phase iron core and establishes respectively three-phase primary winding and three-phase secondary winding on the three-phase iron core, every looks secondary winding in the three-phase secondary winding includes two sets of single-phase secondary split winding, six sets of the single-phase secondary split winding of conformal formation; each group of single-phase secondary side split windings comprises an upper part branching coil and a lower part branching coil, and the upper part branching coil and the lower part branching coil can be connected in parallel through external wiring. The utility model discloses in when the polycrystalline silicon converter transformer that provides takes place to lack the looks, two upper and lower branch coils of single-phase secondary side split winding are parallelly connected to same load output, have avoided traditional polycrystalline silicon converter transformer structure to exist at upper and lower secondary side winding not operation simultaneously, lack the phenomenon of burning out that the operation leads to of looks promptly.

Description

Polycrystalline silicon converter transformer and control system

Technical Field

The utility model relates to a polycrystalline silicon converter transformer technical field, concretely relates to polycrystalline silicon converter transformer and control system.

Background

The development of the solar photovoltaic power generation industry has driving and promoting effects on the production of polycrystalline silicon and the manufacturing industry of silicon wafers. The polycrystalline silicon reduction furnace is very critical equipment in the production process of polycrystalline silicon, a production process link from trichlorosilane to polycrystalline silicon is completed in the furnace, the temperature in the furnace is controlled to be directly related to the reduction purity of silicon cores in the furnace and the quality of final polycrystalline silicon products, and therefore polycrystalline silicon converter transformer equipment for providing a heating power supply for the reduction furnace plays a very important role; along with the great improvement of the polycrystalline silicon capacity, the capacity of a corresponding polycrystalline silicon current transformation dry-type transformer is increased, so that the abnormal conditions in the polycrystalline silicon production process are increased, such as the phenomena of high occupation ratio of polycrystalline silicon abnormal sheet materials, high electric energy loss and the like caused by the fact that a silicon rod collides with the wall, the broken rod is monitored, the power is cut off and then the power is supplied for continuous production and the like.

The conditions presented on the polysilicon current transformer dry type current transformer are as follows: when a tap of some gears of the existing polycrystalline silicon current-converting dry type transformer works, the upper and lower secondary windings do not operate simultaneously, namely, the current-converting dry type transformer is in a phase-missing operation state, the transformer is in a half-through operation state, the load of the transformer is seriously unbalanced, the eddy current loss generated by magnetic leakage is suddenly and sharply increased, and the local overheating of the head end and the tail end of the winding of the transformer is caused. The secondary winding of the transformer is formed by winding an extremely thin foil, and due to the structural characteristics of the foil, the foil winding can generate uneven current density distribution under the influence of a leakage magnetic field, namely a current squeezing effect, and meanwhile, the leakage magnetic field generated by the winding current can also generate loss in metal structural members such as an upper clamping piece, a lower clamping piece, a pulling plate and the like, and the stray loss concentrated on a small area can often cause the problem of local overheating in the winding and the structural members; the leakage magnetic field can generate extremely uneven current density and eddy current loss in the foil winding conductor, and particularly, the problem is more serious along with the continuous increase of the capacity of the transformer; in addition, when the transformer operates in a half-through mode (namely, in a phase-loss operation mode), the ampere turn imbalance caused by the uneven current distribution of the primary winding is serious, and if a short-circuit fault occurs, the damage to products caused by axial short-circuit electrodynamic force threatens the safe operation of the transformer.

Aiming at the phenomena, the measures adopted in the industry at present are as follows:

1. the cross section of a winding conductor is increased (loss is reduced), the local temperature concentration condition is improved, and the gear overload capacity is improved during phase loss operation;

2. adjusting the distribution of axial heat dissipation air passages of the output winding, and arranging 2-3 layers of axial heat dissipation air passages on the individual winding close to the inner iron core aiming at the actual operation condition on site so as to improve the heat dissipation condition;

3. the large-air-volume centrifugal fan is arranged on the side surfaces of the primary winding and the secondary winding of the converter transformer;

the measures all improve the manufacturing cost of the product to a great extent and are not economical; and the local overheating in open-phase operation (i.e., half-ride through operation) is not effectively improved.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a polycrystalline silicon converter transformer and control system, when taking place half and pass through the operation (lack the looks operation), export after connecting in parallel with two separated time coils in single-phase secondary side split winding upper portion, lower part, ampere turn balance nature is good, does not have local overheat problem, has avoided traditional polycrystalline silicon converter transformer structure to exist the phenomenon of burning out when upper and lower secondary side winding lack the looks operation.

In order to solve the technical problem, the utility model discloses a following technical scheme:

in a first aspect, the utility model provides a polycrystalline silicon converter transformer, including three-phase iron core, and three-phase primary winding and three-phase secondary winding that overlap respectively on the three-phase iron core, every looks secondary winding in the three-phase secondary winding includes two sets of single-phase secondary split winding, six sets of the single-phase secondary split winding of conformal formation, and six sets of the single-phase secondary split winding are independent each other, and are insulating each other;

each set of the single-phase secondary side split windings comprises an upper part coil and a lower part coil, the upper part coil and the lower part coil in each set of the single-phase secondary side split windings are distributed at intervals in the axial direction of the iron core, and the upper part coil and the lower part coil in each set of the single-phase secondary side split windings can be connected in parallel through external wiring.

Further, the upper coil includes a plurality of tap positions, and the lower coil includes a plurality of tap positions.

Further, the number of the gear taps in the upper and lower sub-coils is the same; or alternatively

The upper branching coil is provided with one more gear outgoing line than the lower branching coil, and the number of turns of a coil connected with the gear outgoing line is equal to that of the lower branching coil; or alternatively

The lower part coil is provided with a gear outgoing line more than the upper part coil, and the number of turns of a coil connected with the gear outgoing line is equal to that of the upper part coil.

Furthermore, the iron core, the secondary winding and the primary winding adopt a concentric structure, the secondary winding is sleeved on the outer side of the iron core, and the primary winding is sleeved on the outer side of the secondary winding.

Further, the upper sub-coils in the two groups of single-phase secondary split windings in each phase of secondary winding are arranged correspondingly; the lower sub-coils in the two groups of single-phase secondary split windings in each phase of secondary winding are arranged correspondingly.

Further, the upper part sub-coils in each group of the single-phase secondary side split windings are at the same height of the iron core in the axial direction; the lower part sub-coils in each group of single-phase secondary side split windings are at the same height of the iron core in the axial direction.

Furthermore, each phase of the primary winding is split into two windings in the axial direction of the iron core, the two windings are respectively a first primary winding and a second primary winding, and the first primary winding and the second primary winding are connected in parallel.

Furthermore, the primary winding adopts a triangular connection mode.

Further, the primary winding includes a plurality of tap taps therein.

In a second aspect, the present invention provides a control system, wherein the control system further comprises a power regulator, and the power regulator is electrically connected to the polysilicon converter transformer.

Further, the power regulator comprises a control module, and the control module is used for controlling the upper branching coil and the lower branching coil in each group of single-phase secondary side split windings to be disconnected with each other or to be connected in parallel through external wiring.

The utility model discloses an above-mentioned technical scheme's beneficial effect as follows:

the utility model provides a polycrystalline silicon converter transformer, which comprises a three-phase iron core, and a three-phase primary winding and a three-phase secondary winding which are respectively sleeved on the three-phase iron core, wherein each phase of secondary winding in the three-phase secondary winding comprises two groups of single-phase secondary split windings which are formed into six groups by conformality, and the six groups of single-phase secondary split windings are independent and insulated from each other; each set of the single-phase secondary side split windings comprises an upper part coil and a lower part coil, the upper part coil and the lower part coil in each set of the single-phase secondary side split windings are distributed at intervals in the axial direction of the iron core, and the upper part coil and the lower part coil in each set of the single-phase secondary side split windings can be connected in parallel through external wiring. The utility model discloses in the polycrystalline silicon converter transformer that provides, through the gear setting of being qualified for the next round of competitions to six single-phase secondary windings of three-phase secondary winding, work as when polycrystalline silicon converter transformer takes place to lack the looks, parallelly connected back to same load output with two upper and lower separated time coils of single-phase secondary split winding, the winding magnetic leakage field that makes the transformer operation distributes evenly, have fine ampere turn balanced relation between primary winding and the secondary winding, lossless density concentrated region can not form horizontal eddy current loss and concentrates, there is not too high phenomenon of local temperature, improved converter transformer product operational reliability and stability and effectively reduced the loss of electricity cost and the unusual sheet stock of polycrystalline silicon and account for than. And simultaneously, the utility model provides a polycrystalline silicon converter transformer has that the thermal shock ability is strong, the overload capacity is big, difficult fire and urgent overload capacity are strong, and it is convenient to maintain, and is insensitive to humidity, dust, difficult fracture, characteristics such as performance safe and reliable.

Drawings

FIG. 1 is a schematic structural diagram of a polysilicon converter transformer;

FIG. 2 is a schematic diagram showing the arrangement of primary windings and secondary windings in a polysilicon converter transformer;

FIG. 3a is a schematic diagram of the symmetrical output of the polysilicon current transformer in example 1;

FIG. 3b is another schematic diagram of the symmetric output of the polysilicon current transformer in accordance with embodiment 1;

FIG. 4a is a schematic diagram of the asymmetric output of the polysilicon current transformer in example 2;

FIG. 4b is another schematic diagram of the asymmetric output of the polysilicon converter transformer in example 2.

Reference numerals:

the transformer comprises a primary winding 1, a secondary winding 2, a gear tap 3, an iron core 4 and a gear outlet 5.

Detailed Description

For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the present invention.

The polysilicon converter transformer provided by the present invention is further explained with reference to the drawings.

In a first aspect, the utility model provides a polycrystalline silicon converter transformer, including three-phase iron core 4, and three-phase primary winding 1 and three-phase secondary winding 2 that overlap respectively on three-phase iron core 4, every looks secondary winding 2 in three-phase secondary winding 2 includes two sets of single-phase secondary split winding, six sets of the single-phase secondary split winding of conformal formation, and six sets of the single-phase secondary split winding are independent each other, and are insulated each other; each set of the single-phase secondary side split windings comprises an upper part coil and a lower part coil, the upper part coil and the lower part coil in each set of the single-phase secondary side split windings are distributed at intervals in the axial direction of the iron core 4, and the upper part coil and the lower part coil in each set of the single-phase secondary side split windings can be connected in parallel through external wiring.

The utility model discloses in provide a polycrystalline silicon converter transformer, refer to figure 1 ~ 2, polycrystalline silicon converter transformer is three-phase transformer, and its structure includes three-phase iron core 4 to and establish respectively three-phase primary winding 1 and three-phase secondary winding 2 on the three-phase iron core 4. Further, the three-phase secondary winding 2 in the polysilicon converter transformer is axially split into two windings to form six single-phase secondary split windings, and the six single-phase secondary split windings are electrically independent and insulated from each other. The structure of each single-phase secondary side split winding is as follows: each single-phase secondary side split winding includes an upper part coil and a lower part coil which are spaced apart in the axial direction of the core 4. The winding and arrangement mode of the single-phase secondary side split winding refers to the attached figure 2, and D1 and D11 in the figure 2 are wound together to form a unit; d12, D13 and D14 are wound together to form a unit; d2 and D21 are wound together to form a unit; d22, D23 and D24 are wound together into a unit. The single-phase secondary side split winding adopts a structure that the inner side and the outer side are separately wound and then assembled, so that the problems of high coil winding difficulty and low efficiency caused by large product capacity are solved; and simultaneously, the utility model provides a winding structure has good manufacturability and efficiency, has improved transformer overall stability, and design and manufacturing process degree of difficulty greatly reduced have improved the production efficiency of product and have reduced the overall manufacturing degree of difficulty and the cost of product, and secondary winding 2 adopts multistage series connection output structure simultaneously, satisfies the requirement of "voltage current change range is wide".

The utility model discloses in the polycrystalline silicon converter transformer that provides, can be according to polycrystalline silicon converter transformer's operating condition, control upper portion separated time circle with lower part coil is in mutually independent state, or switches into the parallelly connected state through outside wiring. Specifically, when the polysilicon converter transformer is in a through operation (i.e. the upper and lower sub-coils in each single-phase secondary side split winding are both working), each group of single-phase secondary side split windings can respectively carry corresponding loads, and the upper sub-coil and the lower sub-coil in each group of single-phase secondary side split windings are in a mutually independent state. When the polycrystalline silicon converter transformer is in semi-crossing operation (namely, a certain coil in the single-phase secondary side split winding exits from operation due to the occurrence of the load such as the occurrence of the faults of a silicon rod touching the wall, a split rod, a reverse rod and the like), the upper coil and the lower coil are connected in parallel through external wiring and then output to the same load, so that the phase failure is avoided.

According to the utility model discloses a some embodiments, including a plurality of gears in the upper portion separated time circle 3 of taking a percentage, including a plurality of gears in the lower portion separated time circle 3 of taking a percentage.

The utility model discloses in including a plurality of gears 3 of taking a percentage in the upper portion separated time circle, including a plurality of gears 3 of taking a percentage in the lower part separated time circle, specifically, the quantity that 3 were taken a percentage in the gear is according to every group the output voltage's of single-phase vice limit split winding size sets up, for example can be for 5. The voltage level of the gear tap 3 from inside to outside is sequentially reduced, and the current is sequentially increased.

According to some embodiments of the invention, the number of gear taps 3 in the upper and lower section coils is the same; or, the upper branching coil is provided with one more gear outgoing line 5 than the lower branching coil, and the number of turns of the coil connected with the gear outgoing line 5 is equal to that of the lower branching coil; or the lower part branching coil is provided with one more gear outgoing line 5 than the upper part branching coil, and the number of turns of a coil connected with the gear outgoing line 5 is equal to that of the upper part branching coil. For example, when the output voltages of the upper and lower branching coils are the same, the number of the tap positions 3 in the upper and lower branching coils may be the same; or when the output voltage of the upper branching coil is higher than that of the lower branching coil, the upper branching coil can be provided with one more gear outgoing line 5 than that of the lower branching coil, and the number of turns of a coil connected with the gear outgoing line 5 is equal to that of the lower branching coil; or, when the output voltage of the lower wire coil is higher than that of the upper wire coil, the lower wire coil may be provided with one more gear outgoing line 5 than the upper wire coil, and the number of turns of a coil connected with the gear outgoing line 5 is equal to that of the upper wire coil.

In the utility model, the polycrystalline silicon converter transformer is in actual use, every single-phase secondary side split winding can symmetrical output, namely the upper part separated time circle with the same voltage of lower part separated time circle output and electric current. When the single-phase secondary side split winding is symmetrically output, the upper part coil and the lower part coil are provided with the same number of gear taps 3. When the polycrystalline silicon converter transformer runs in a semi-penetrating mode, the gear taps 3 at the same gear are connected in parallel through an external connection wire and output to the same load, and the phase failure is avoided. Meanwhile, each single-phase secondary side split winding can also be output asymmetrically, namely the upper sub-coil and the lower sub-coil output different voltages and currents. When the single-phase secondary side split winding is output asymmetrically, if the output voltage of the upper part coil is higher than that of the lower part coil, the upper part coil is provided with one more gear outgoing line 5 than the lower part coil, and the number of turns of a coil connected with the gear outgoing line 5 is equal to that of the lower part coil. And if the output voltage of the lower part coil is higher than that of the upper part coil, the lower part coil is provided with a gear outgoing line 5 more than the upper part coil, and the number of turns of a coil connected with the gear outgoing line 5 is equal to that of the upper part coil. When the polycrystalline silicon converter transformer runs in a semi-crossing mode, coils with the same voltage on the upper distributing coil and the lower distributing coil of the single-phase secondary side split winding are connected in parallel through an external connection wire and a set gear outgoing line 5, then the coils are output by the same load, and the phase failure is avoided.

According to some embodiments of the utility model, unshakable in one's determination 4 vice limit winding 2 with primary winding 1's coil adopts concentric type structure, 2 covers of vice limit winding are established 4 outsides unshakable in one's determination, 1 covers of primary winding is established 2 outsides of vice limit winding.

According to some embodiments of the present invention, the upper part coils of the two sets of single-phase secondary split windings of each phase of the secondary winding 2 are arranged correspondingly; the lower sub-coils in the two groups of single-phase secondary split windings in each phase of the secondary winding 2 are arranged correspondingly.

According to some embodiments of the present invention, the upper coil dividers in each of the single-phase secondary split windings are at the same height in the axial direction of the core 4; the lower sub-coils in each group of the single-phase secondary side split windings are at the same height in the axial direction of the iron core 4.

According to some embodiments of the present invention, every phase the primary winding 1 is in the axial of the iron core 4 is split into two windings, respectively a first primary winding and a second primary winding, and the first primary winding is connected in parallel to the second primary winding.

According to some embodiments of the present invention, the primary winding 1 is connected in a delta connection.

According to some embodiments of the present invention, a plurality of tap taps are included in the primary winding 1.

Specifically, as shown in fig. 2, the primary winding 1 in the polycrystalline silicon converter dry-type transformer of the present invention is split into two windings in the axial direction of the iron core 4, which are a first primary winding and a second primary winding (i.e., G1 and G2 in fig. 2), and the first primary winding and the second primary winding are connected in parallel. The primary winding 1 adopts a triangular connection mode, and each phase of the primary winding 1 is provided with a plurality of tapping taps.

The utility model discloses in the polycrystalline silicon converter transformer that provides, through the gear setting of being qualified for the next round of competitions to six single-phase secondary windings 2 of three-phase secondary winding 2, work as when polycrystalline silicon converter transformer takes place to lack mutually, export two parallelly connected back of upper and lower separated time coils of single-phase secondary split winding, make the winding magnetic leakage field distribution of transformer operation even, have fine ampere turn balance relation between primary winding 1 and the secondary winding 2, lossless density concentrated region can not form horizontal eddy current loss and concentrate, no local high temperature phenomenon, improved converter transformer product operational reliability and stability and effectively reduced the loss of electricity cost and the unusual sheet stock of polycrystalline silicon and account for the ratio. And simultaneously, the utility model provides a polycrystalline silicon converter transformer has that the thermal shock ability is strong, the overload capacity is big, difficult fire and urgent overload capacity are strong, and it is convenient to maintain, and is insensitive to humidity, dust, difficult fracture, characteristics such as performance safe and reliable.

In a second aspect, the present invention provides a control system, wherein the control system further comprises a power regulator, and the power regulator is electrically connected to the polysilicon converter transformer.

According to the utility model discloses a some embodiments, can include the control module group in the accent power ware, the control module group is used for controlling every group in the single-phase secondary side split winding upper portion separated time circle with break off each other or parallelly connected through the outside wiring between the separated time circle of lower part. The power regulator can comprise a monitoring system, and the monitoring system is used for monitoring the operation condition of the polysilicon converter transformer.

The utility model discloses in provide a control system, including as above in the control system polycrystalline silicon converter transformer and transfer the merit ware, including monitoring system and control module group in transferring the merit ware, transfer the merit ware with the electricity is connected between the polycrystalline silicon converter transformer. When a monitoring system in the power regulator finds that the polycrystalline silicon converter transformer is in phase failure, a signal of the phase failure is fed back to the control module at once, the control module receives the signal of the phase failure and then switches external wiring rapidly, and an upper branching coil and a lower branching coil of a single-phase secondary side split winding are connected in parallel and then output to the same load, so that the phase failure is avoided.

The invention is further illustrated by the following specific examples.

Description of the phase-loss operating conditions: for example, in fig. 2, the secondary windings D1, D11, D12, D13, D14 and the primary windings (G1 and G2) participate in operation, and at the same time, the other secondary windings D2, D21, D22, D23, D24 are open-circuited, although the dc resistance loss of the winding D14 section is not large, the stray loss coefficient is as high as several times of that in normal calculation when D1-D14 operate, and because the secondary windings are located at the innermost side, the heat dissipation condition is not good, so that the allowable temperature rise of the D14 coil hot-spot temperature rise super-insulation system is caused, and the burning phenomenon caused by the converter transformer occurs occasionally.

Example 1

As shown in fig. 3a and 3b, in the polysilicon converter transformer provided in this embodiment, each group of single-phase secondary split windings symmetrically outputs the same voltage and current, and the upper sub-coil and the lower sub-coil have a plurality of tap taps 3 (e.g., 1n, 1u1, 1u2, 1u3, 1u4, 1u5, 1n ', 1u1', 1u2', 1u3', 1u4', 1u5' in the figure.

When the transformer normally works, the upper sub-coil and the lower sub-coil of the single-phase secondary side split winding can respectively carry corresponding loads, and secondary output rated voltage and current are shown in table 1. When a monitoring galvanometer in a monitoring system in the power regulator finds that the phase is lacking (namely, a certain branch coil in the single-phase secondary side split winding quits working due to the load carried by a silicon rod, such as wall collision, rod cracking, rod reversing and the like), an adaptive control system is used for quickly switching an external connection to output the upper branch coil and the lower branch coil of the single-phase secondary side split winding to the same load after the upper branch coil and the lower branch coil are connected in parallel, so that the phase is not lacking. With reference to fig. 3a and 3b, the outgoing line 1n of the upper wire distributing ring and the outgoing line 1n 'of the lower coil are connected in parallel, and the outgoing line 1u5 of the upper wire distributing ring and the outgoing line 1u5' of the lower coil are connected in parallel through external wiring.

TABLE 1

Example 2

As shown in fig. 4a and 4b, in the polysilicon converter transformer provided in this embodiment, each group of single-phase secondary side split windings asymmetrically outputs the same voltage and current, an upper sub-coil and a lower sub-coil in the single-phase secondary side split windings output different voltages and currents, and the upper sub-coil and the lower sub-coil have multiple tap taps 3 according to different voltage and current output requirements (e.g. 1n, 1u1, 1u2, 1u3, 1u4, 1u5, 1u1', 1u2', 1u3', 1u4', 1u5' in the figure. Meanwhile, because the output voltage of the lower part branching coil is higher than that of the upper part branching coil, the lower part branching coil also comprises a gear outgoing line 1n 5', and the number of turns of the lower part branching coil 1n ' to 1n 5' is equal to that of the upper part branching coil 1n to 1n 5.

When the transformer normally works, the upper sub-coil and the lower sub-coil of the single-phase secondary side split winding can respectively carry corresponding loads, and secondary output rated voltage and current are shown in table 2. When a monitoring galvanometer in a monitoring system in the power regulator finds that the phase is lacking (namely, a certain branch coil in the single-phase secondary side split winding quits working due to the load carried by a silicon rod, such as wall collision, rod cracking, rod reversing and the like), an adaptive control system is used for quickly switching an external connection to output the upper branch coil and the lower branch coil of the single-phase secondary side split winding to the same load after the upper branch coil and the lower branch coil are connected in parallel, so that the phase is not lacking. Referring to fig. 4a and 4b, that is, the outgoing line 1n of the upper wire distributing coil and the outgoing line 1n 'of the lower coil are connected in parallel, the outgoing line 1u5 of the upper wire distributing coil and the outgoing line 1u5 "of the lower coil are connected in parallel through an external connection, and at this time, 1n' to 1u 5" also output the same voltage as 1n to 1u5, namely 2500V in table 2.

TABLE 2

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and the like in the description of the invention does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (11)

1. A polysilicon converter transformer comprises a three-phase iron core, and a three-phase primary winding and a three-phase secondary winding which are respectively sleeved on the three-phase iron core, and is characterized in that:

each phase of secondary side winding in the three-phase secondary side winding comprises two groups of single-phase secondary side split windings which form six groups of single-phase secondary side split windings together, and the six groups of single-phase secondary side split windings are independent and insulated from each other;

each set of the single-phase secondary side split windings comprises an upper part coil and a lower part coil, the upper part coil and the lower part coil in each set of the single-phase secondary side split windings are distributed at intervals in the axial direction of the iron core, and the upper part coil and the lower part coil in each set of the single-phase secondary side split windings can be connected in parallel through external wiring.

2. The polysilicon converter transformer of claim 1, wherein the upper sub-coil includes a plurality of tap positions therein, and the lower sub-coil includes a plurality of tap positions therein.

3. The polysilicon converter transformer of claim 2, wherein the number of tap positions in the upper and lower sub-coils is the same; or

The upper branching coil is provided with one more gear outgoing line than the lower branching coil, and the number of turns of a coil connected with the gear outgoing line is equal to that of the lower branching coil; or

The lower part coil is provided with a gear outgoing line more than the upper part coil, and the number of turns of a coil connected with the gear outgoing line is equal to that of the upper part coil.

4. The polysilicon converter transformer of claim 1, wherein the core, the secondary winding and the primary winding are concentrically wound, the secondary winding is disposed around the core, and the primary winding is disposed around the secondary winding.

5. The polysilicon converter transformer of claim 1, wherein said upper sub-coils of said two sets of single-phase secondary split windings of each phase are disposed in correspondence; the lower part sub-coils in the two groups of single-phase secondary split windings in each phase of secondary windings are arranged correspondingly.

6. The polysilicon converter transformer of claim 1, wherein the upper coils of each set of the single-phase secondary side split windings are at the same height in the axial direction of the core; the lower part sub-coils in each group of single-phase secondary side split windings are at the same height of the iron core in the axial direction.

7. The polysilicon converter transformer as set forth in claim 1, wherein each of said primary windings of said phases is split into two windings in an axial direction of said core, a first primary winding and a second primary winding, and said first primary winding is connected in parallel with said second primary winding.

8. The polysilicon converter transformer of claim 7, wherein said primary winding is delta-connected.

9. The polysilicon converter transformer of claim 7, wherein a plurality of tap taps are included in the primary winding.

10. A control system, wherein the control system comprises the polysilicon converter transformer as recited in any one of claims 1 to 9, and further comprises a power regulator, and the power regulator is electrically connected with the polysilicon converter transformer.

11. The control system according to claim 10, wherein the power regulator includes a control module, and the control module is configured to control the upper sub-coil and the lower sub-coil in each group of the single-phase secondary split windings to be disconnected from each other or connected in parallel through an external connection.

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