Power adjusting cabinet and multi-closed-loop polycrystalline silicon reduction furnace power supply device

Abstract

The utility model discloses a power adjusting cabinet and a multi-closed-loop polycrystalline silicon reduction furnace power supply device, which are applied to the field of polycrystalline silicon. The power adjusting cabinet comprises a first resistor unit, a second resistor unit, a third resistor unit, a first switch, a second switch, a third switch, a fourth switch and a fifth switch, and at least one resistor is arranged in each resistor unit. Due to the specific number of resistors in each resistor unit, under the condition that the number of the voltage regulating cabinet is not increased, the yield of polycrystalline silicon is increased, the equipment and material investment is saved, and the configuration of a power supply system is simplified. Meanwhile, the structure forms a system of three groups of closed-loop controllers, the three resistor units are respectively controlled to operate, and the closed-loop circuits do not influence each other. When the feedback current does not reach the set breakdown current, voltage closed-loop voltage limiting control is adopted, when the feedback current reaches the set breakdown current, current closed-loop constant-current control is adopted, and three closed-loop voltage limiting constant-current control is adopted, so that the stability of the power regulation cabinet is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the polycrystal silicon field especially is concerned with a power cabinet, polycrystal silicon reduction furnace power device of many closed loops. BACKGROUND

[0002] In recent years, due to the vigorous development of photovoltaic whole industry chain, the production scale of photovoltaic raw material polycrystal silicon is bigger and bigger, so higher requirement is put forward to the core device reduction furnace and supporting power equipment of polycrystal silicon production. At present, the polycrystal silicon reduction furnace power supply technology changes with the change of reduction furnace, to improve the output and efficiency, the number of single furnace rod in the reduction furnace is more and more. However, the power supply of reduction furnace is restricted by the parameter of semiconductor component, and its output voltage range is always within 3000V, which leads to the limited number of silicon core carried by the existing reduction power supply, so it is necessary to adopt multiple power cabinets to improve the number of silicon rods of single reduction furnace. However, the equipment investment of multiple power cabinets is large, and the factory space is large, and at the same time, the line connection is complex.

[0003] In view of the above-mentioned technology, seeking an optimized power cabinet is a problem to be solved by the person skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a kind of power cabinet, polycrystal silicon reduction furnace power device of many closed loops. The number of silicon rods of single reduction furnace can be improved, and the complexity of equipment investment cost and line connection is reduced.

[0005] To solve the above-mentioned technical problem, the utility model provides a kind of power cabinet, including: first resistance unit, second resistance unit, third resistance unit, first switch, second switch, third switch, fourth switch and fifth switch, and the resistance number in each resistance unit is at least one;

[0006] Wherein, the first end of first resistance unit is connected with the output end of main voltage regulator, and the first end of first resistance unit is connected with the output end of boost module and the output end of auxiliary voltage regulator by first switch, and the second end of first resistance unit is connected with the zero line end of reduction transformer by second switch;

[0007] The first end of second resistance unit is connected with the output end of auxiliary voltage regulator and the output end of boost module by third switch, and the first end of second resistance unit is connected with the second end of first resistance unit, and the second end of second resistance unit is connected with the zero line end of reduction transformer by fourth switch;

[0008] The first end of the third resistance unit is connected with the output end of the auxiliary voltage regulator and the output end of the boost module through the fifth switch, and the first end of the third resistance unit is connected with the output end of the auxiliary voltage regulator, the second end of the third resistance unit is connected with the zero line end of the reduction transformer through the fourth switch, and the second end of the third resistance unit is connected with the second end of the second resistance unit.

[0009] Preferably, the first resistance unit comprises a first resistance, a second resistance, a third resistance, a fourth resistance, a sixth switch, a seventh switch, an eighth switch and a ninth switch.

[0010] The first end of the first resistance is connected with the first end of the first switch and the output end of the main voltage regulator as the first end of the first resistance unit, and the second end of the first resistance is connected with the first end of the second resistance and the first end of the sixth switch.

[0011] The second end of the second resistance is connected with the first end of the seventh switch, the first end of the eighth switch and the first end of the third resistance.

[0012] The second end of the third resistance is connected with the first end of the fourth resistance.

[0013] The second end of the fourth resistance is connected with the first end of the ninth switch, the first end of the second switch and the first end of the second resistance unit as the second end of the first resistance unit.

[0014] The second end of the sixth switch is connected with the second end of the eighth switch, the second end of the second switch, the second end of the fourth switch and the zero line end of the reduction transformer.

[0015] The second end of the seventh switch is connected with the second end of the first switch, the second end of the ninth switch, the second end of the third switch, the second end of the fifth switch, the output end of the auxiliary voltage regulator and the output end of the boost module.

[0016] Preferably, the second resistance unit comprises a fifth resistance, a sixth resistance and a seventh resistance.

[0017] The first end of the fifth resistance is connected with the first end of the third switch and the second end of the first resistance unit as the first end of the second resistance unit, and the second end of the fifth resistance is connected with the first end of the sixth resistance.

[0018] The second end of the sixth resistance is connected with the first end of the seventh resistance.

[0019] The second end of the seventh resistance is connected with the second end of the third resistance unit and the first end of the fourth switch as the second end of the second resistance unit.

[0020] Preferably, the third resistance unit comprises an eighth resistance and a ninth resistance.

[0021] The first end of the eighth resistor is connected with the second end of the third resistor unit, the second end of the second resistor unit and the first end of the fourth switch, and the second end of the eighth resistor is connected with the first end of the ninth resistor.

[0022] The second end of the ninth resistor is connected with the first end of the fifth switch and the output end of the auxiliary voltage regulator.

[0023] Preferably, the power supply device further comprises a first starting switch, a second starting switch, a third starting switch and a fourth starting switch.

[0024] The first end of the first starting switch is connected with the first end of the second starting switch and the output end of the auxiliary voltage regulator, and the second end of the first starting switch is connected with the control end of the voltage boosting module.

[0025] The second end of the second starting switch is connected with the output end of the voltage boosting module.

[0026] The first end of the third starting switch is connected with the output end of the main voltage regulator, and the second end of the third starting switch is connected with the first end of the first resistor unit and the first end of the first switch.

[0027] The first end of the fourth starting switch is connected with the output end of the auxiliary voltage regulator, and the second end of the fourth starting switch is connected with the first end of the fifth switch and the first end of the third resistor unit.

[0028] Preferably, the power supply device further comprises a first breaker and a second breaker.

[0029] The first end of the first breaker is connected with the first end of the third starting switch and the output end of the main voltage regulator, and the second end of the first breaker is connected with the second end of the third starting switch, the first end of the first resistor unit and the first end of the first switch.

[0030] The first end of the second breaker is connected with the zero line end of the restoring transformer, and the second end of the second breaker is connected with the first end of the fifth switch and the first end of the third resistor unit.

[0031] Preferably, the power supply device further comprises a third breaker.

[0032] The first end of the third breaker is connected with the second end of the first resistor unit, and the second end of the third breaker is connected with the first end of the second resistor unit.

[0033] To solve the above technical problems, the application also provides a multi-closed-loop polysilicon reduction furnace power supply device, comprising a plurality of the above power cabinets.

[0034] Preferably, the power supply device further comprises a reduction furnace and a high-voltage transformer.

[0035] The output end of the reduction furnace is connected with the first input end of each power cabinet.

[0036] The output end of the high-voltage transformer is connected with the second input end of each power regulating cabinet.

[0037] Preferably, it further comprises a PLC control cabinet containing ground detection.

[0038] The control end of the PLC control cabinet is connected with the control end of each power regulating cabinet.

[0039] The utility model provides a kind of power regulating cabinet, comprising: first resistance unit, second resistance unit, third resistance unit, first switch, second switch, third switch, fourth switch and fifth switch, and the resistance number in each resistance unit is at least one;Wherein, the first end of first resistance unit is connected with the output end of main voltage regulator, and the first end of first resistance unit is connected with the output end of boost module and the output end of auxiliary voltage regulator by first switch, the second end of first resistance unit is connected with the zero line end of restoration transformer by second switch;The first end of second resistance unit third switch is connected with the output end of auxiliary voltage regulator and the output end of boost module, and the first end of second resistance unit is connected with the second end of first resistance unit, the second end of second resistance unit is connected with the zero line end of restoration transformer by fourth switch;The first end of third resistance unit is connected with the output end of auxiliary voltage regulator and the output end of boost module by fifth switch, and the first end of third resistance unit is connected with the output end of auxiliary voltage regulator, the second end of third resistance unit is connected with the zero line end of restoration transformer by fourth switch, and the second end of third resistance unit is connected with the second end of second resistance unit.Obviously, the specific resistance number in each resistance unit of the present application improves the output of polysilicon without increasing the number of cabinet, saves equipment and material investment, and simplifies power system configuration.Three closed-loop controllers are used to control the operation of three resistance units respectively, and each closed-loop circuit does not affect each other.When feedback current does not reach set breakdown current, voltage closed-loop voltage limiting control is used, when feedback current reaches set breakdown current, current closed-loop constant current control is used, three closed-loop voltage limiting constant current control is used, to further improve the stability of power regulating cabinet. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the embodiments, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0041] Figure 1 It is a schematic diagram of the power regulating cabinet provided by the embodiments of the present application;

[0042] Figure 2 It is a specific circuit diagram of the power regulating cabinet provided by the embodiments of the present application;

[0043] Figure 3 A schematic diagram of a multi-closed-loop polysilicon reduction furnace power supply device is provided for another embodiment of the application. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the utility model will be apparently and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the utility model.

[0045] The core of the utility model provides a kind of power cabinet, multi-closed-loop polysilicon reduction furnace power supply device.

[0046] In order to make the personnel in this technical field better understand the utility model scheme, the utility model is further described in detail in conjunction with the drawings and specific embodiments.

[0047] Figure 1 A schematic diagram of a power cabinet is provided for the embodiment of the application, as shown in the figure, comprising: first resistance unit 1, second resistance unit 2, third resistance unit 3, first switch K1, second switch K2, third switch K3, fourth switch K4 and fifth switch K5, and the resistance number in each resistance unit is at least one;In addition, Figure 1 Also include: main voltage regulator 4, boost module 5, auxiliary voltage regulator 6, auxiliary voltage regulator 7, reduction transformer T11. Wherein, main voltage regulator 4 includes: thyristor diode V11-V15;Auxiliary voltage regulator 6 includes: thyristor diode VB1-VB2;Auxiliary voltage regulator 7 includes: thyristor diode VF1. Figure 1 T1-T8 in the are all from transformer low-voltage tap.

[0048] Wherein, the first end of first resistance unit 1 is connected with the output end of main voltage regulator 4, and the first end of first resistance unit 1 is connected with the output end of boost module 5 and the output end of auxiliary voltage regulator 6 through first switch K1, the second end of first resistance unit 1 is connected with the zero line end of reduction transformer T11 through second switch K2;

[0049] The first end of second resistance unit 2 is connected with the output end of auxiliary voltage regulator 6 and the output end of boost module 5 through third switch K3, and the first end of second resistance unit 2 is connected with the second end of first resistance unit 1, the second end of second resistance unit 2 is connected with the zero line end of reduction transformer T11 through fourth switch K4;

[0050] The first end of the third resistance unit 3 is connected with the output end of the auxiliary voltage regulator 6 and the output end of the boost module 5 through the fifth switch K5, and the first end of the third resistance unit 3 is connected with the output end of the auxiliary voltage regulator 7, the second end of the third resistance unit 3 is connected with the zero line end of the reduction transformer T11 through the fourth switch K4, and the second end of the third resistance unit 3 is connected with the second end of the second resistance unit 2.

[0051] In a specific embodiment, the power supply starting mode of the power cabinet provided by the application is as follows: starting from the first resistance unit 1, closing the first switch K1 and the second switch K2, starting the auxiliary voltage regulator 6 (VB1-VB2) to run at a high voltage, after the resistance in the first resistance unit 1 is broken, opening the first switch K1 and closing the third starting switch CJ3, at this time, starting the main voltage regulator 4 (V11-V15) to maintain the running of the first resistance unit 1, realizing the first closed-loop control; then closing the fifth switch K5 and the fourth switch K4, starting the auxiliary voltage regulator 6 (VB1-VB2) to run at a high voltage, after the resistance in the third resistance unit 3 is broken, opening the fifth switch K5, at this time, starting the auxiliary voltage regulator 7 (VF1) to maintain the running of the third resistance unit 3, realizing the third closed-loop control; then closing the third switch K3, the fourth switch K4 and the first starting switch CJ1, starting the auxiliary voltage regulator 6 (VB1-VB2) to run at a high voltage, after the resistance in the second resistance unit 2 is broken, opening the first starting switch CJ1 and closing the second starting switch CJ2, at this time, starting the auxiliary voltage regulator 6 (VB1-VB2) to maintain the running of the second resistance unit 2, realizing the second closed-loop control. The breaking sequence of the three resistance units is: the first resistance unit 1, the third resistance unit 3 and the second resistance unit 2. Among them, it can be known that the first resistance unit 1 and the current flow direction serve as the control mode of the first group of closed-loop controllers; the second resistance unit 2 and the current flow direction serve as the control mode of the second group of closed-loop controllers; and the third resistance unit 3 and the current flow direction serve as the control mode of the third group of closed-loop controllers. That is, the application adopts three groups of closed-loop controllers to control the running of the three resistance units respectively, and the closed-loop circuits do not affect each other. When the feedback current does not reach the set breaking current, voltage closed-loop voltage limiting control is adopted, when the feedback current reaches the set breaking current, current closed-loop constant current control is adopted, and three closed-loop voltage limiting constant current control is adopted. At the same time, since the main voltage regulator 4, the auxiliary voltage regulator 6 and the auxiliary voltage regulator 7 are all composed of silicon controlled diodes, the silicon controlled diodes have the function of synchronous signal digital phase-locked loop, can accurately capture the zero crossing point of the power grid, ensure the accurate triggering of the silicon controlled diode, and realize that the reduction furnace starting and the parallel running power supply share one auxiliary voltage regulator 6, the power supply is provided with a boost module 5, can be self-started at the same time, the starting is fast, and the production efficiency is improved.

[0052] It should be noted that the number of resistors in each resistor unit is not limited in the application, and as a preferred embodiment, the first resistor unit 1 includes four resistors, the second resistor unit 2 includes three resistors, and the third resistor unit 3 includes two resistors.

[0053] The power regulating cabinet provided by the utility model, comprising: a first resistor unit, a second resistor unit, a third resistor unit, a first switch, a second switch, a third switch, a fourth switch and a fifth switch, and the number of resistors in each resistor unit is at least one; wherein the first end of the first resistor unit is connected with the output end of the main voltage regulator, and the first end of the first resistor unit is connected with the output end of the boost module and the output end of the auxiliary voltage regulator through the first switch, and the second end of the first resistor unit is connected with the zero line end of the restoration transformer through the second switch; the first end of the second resistor unit is connected with the output end of the auxiliary voltage regulator and the output end of the boost module through the third switch, and the first end of the second resistor unit is connected with the second end of the first resistor unit, and the second end of the second resistor unit is connected with the zero line end of the restoration transformer through the fourth switch; the first end of the third resistor unit is connected with the output end of the auxiliary voltage regulator and the output end of the boost module through the fifth switch, and the first end of the third resistor unit is connected with the output end of the auxiliary voltage regulator, and the second end of the third resistor unit is connected with the zero line end of the restoration transformer through the fourth switch, and the second end of the third resistor unit is connected with the second end of the second resistor unit. It can be seen that the number of specific resistors in each resistor unit of the application improves the output of polycrystalline silicon without increasing the number of cabinets, saves equipment and material investment, and simplifies the power system configuration. At the same time, three groups of closed-loop controllers are adopted to control the operation of the three resistor units respectively, and each closed-loop circuit does not affect each other. When the feedback current does not reach the set breakdown current, voltage closed-loop voltage limiting control is adopted, when the feedback current reaches the set breakdown current, current closed-loop constant current control is adopted, three closed-loop voltage limiting constant current control is adopted, and the stability of the power regulating cabinet is further improved.

[0054] On the basis of the above-mentioned embodiments, as a preferred embodiment, Figure 2As shown in the figure, the first resistance unit 1 comprises: a first resistance R1, a second resistance R2, a third resistance R3, a fourth resistance R4, a sixth switch K6, a seventh switch K7, an eighth switch K8 and a ninth switch K9; wherein the first end of the first resistance R1 is connected with the first end of the first switch K1 and the output end of the main voltage regulator 4 as the first end of the first resistance unit 1, the second end of the first resistance R1 is connected with the first end of the second resistance R2 and the first end of the sixth switch K6; the second end of the second resistance R2 is connected with the first end of the seventh switch K7, the first end of the eighth switch K8 and the first end of the third resistance R3; the second end of the third resistance R3 is connected with the first end of the fourth resistance R4; the second end of the fourth resistance R4 is connected with the first end of the ninth switch K9, the first end of the second switch K2 and the first end of the second resistance unit 2 as the second end of the first resistance unit 1; the second end of the sixth switch K6 is connected with the second end of the eighth switch K8, the second end of the second switch K2, the second end of the fourth switch K4 and the zero line end of the restoring transformer T11; the second end of the seventh switch K7 is connected with the second end of the ninth switch K9, the second end of the first switch K1, the second end of the third switch K3, the second end of the fifth switch K5, the output end of the auxiliary voltage regulator 6 and the output end of the voltage boosting module 5.

[0055] On the basis of the above-mentioned embodiment, as a preferred embodiment, as shown in the figure, Figure 2 As shown in the figure, the second resistance unit 2 comprises: a fifth resistance R5, a sixth resistance R6 and a seventh resistance R7; wherein the first end of the fifth resistance R5 is connected with the first end of the third switch K3 and the second end of the first resistance unit 1 as the first end of the second resistance unit 2, the second end of the fifth resistance R5 is connected with the first end of the sixth resistance R6; the second end of the sixth resistance R6 is connected with the first end of the seventh resistance R7; the second end of the seventh resistance R7 is connected with the second end of the third resistance unit 3 and the first end of the fourth switch K4 as the second end of the second resistance unit 2.

[0056] On the basis of the above-mentioned embodiment, as a preferred embodiment, as shown in the figure, Figure 2 As shown in the figure, the third resistance unit 3 comprises: an eighth resistance R8 and a ninth resistance R9; wherein the first end of the eighth resistance R8 is connected with the second end of the second resistance unit 2 and the first end of the fourth switch K4 as the second end of the third resistance unit 3, the second end of the eighth resistance R8 is connected with the first end of the ninth resistance R9; the second end of the ninth resistance R9 is connected with the first end of the fifth switch K5 and the output end of the auxiliary voltage regulator 7 as the first end of the third resistance unit 3.

[0057] On the basis of the above-mentioned embodiment, in order to improve the safety factor when the power regulating cabinet is used, as shown in the figure, Figure 2Also shown, comprising: a first starting switch CJ1, a second starting switch CJ2, a third starting switch CJ3, a fourth starting switch CJ4, a first circuit breaker QF1, a second circuit breaker QF2 and a third circuit breaker QF3.

[0058] The connection relationship is: the first end of the first starting switch CJ1 is connected with the first end of the second starting switch CJ2 and the output end of the auxiliary voltage regulator 6, the second end of the first starting switch CJ1 is connected with the control end of the voltage boosting module 5; the second end of the second starting switch CJ2 is connected with the output end of the voltage boosting module 5; the first end of the third starting switch CJ3 is connected with the output end of the main voltage regulator 4, the second end of the third starting switch CJ3 is connected with the first end of the first resistor unit 1 and the first end of the first switch K1; the first end of the fourth starting switch CJ4 is connected with the output end of the auxiliary voltage regulator 7, the second end of the fourth starting switch CJ4 is connected with the first end of the fifth switch K5 and the first end of the third resistor unit 3. The first end of the first circuit breaker QF1 is connected with the first end of the third starting switch CJ3 and the output end of the main voltage regulator 4, the second end of the first circuit breaker QF1 is connected with the second end of the third starting switch CJ3, the first end of the first resistor unit 1 and the first end of the first switch K1; the first end of the second circuit breaker QF2 is connected with the zero line end of the reduction transformer T11, the second end of the second circuit breaker QF2 is connected with the first end of the fifth switch K5 and the first end of the third resistor unit 3. The first end of the third circuit breaker QF3 is connected with the second end of the first resistor unit 1, the second end of the third circuit breaker QF3 is connected with the first end of the second resistor unit 2.

[0059] According to the above circuit, three circuit breakers QF are provided for high voltage isolation in the circuit, isolation of the parallel branch and the reduction branch, the voltage boosting module can be independently started and boosted; a special auxiliary voltage regulator 7 (VF1) is provided for starting and freewheeling; the self-starting device power is derived from the transformer low-voltage tap T1-T2, and is adjusted and controlled through the 2-gear auxiliary voltage regulator 6 (VB1-VB2), in the high-starting mode, the first starting switch CJ1 is closed, the voltage boosting module 5 outputs high voltage for starting operation, in the current-boosting parallel mode, the second starting switch CJ2 is closed and runs.

[0060] The power supply starting process is in turn: the first starting unit 1-the third starting unit 3-the second starting unit: for the first resistor unit 1, the first resistor R1: close the first starting switch CJ1, the first switch K1, the sixth switch K6, start the sub-voltage regulator 6 (VB1-VB2) to run, after the first resistor R1 is broken, disconnect the first switch K1, close the third starting switch CJ3, start the main voltage regulator 4 (V11-V15) to maintain the operation of the first resistor R1; for the second resistor, close the first starting switch CJ1, the seventh switch K7, the sixth switch K6, start the sub-voltage regulator 6 (VB1-VB2) to run, after the second resistor R2 is broken, disconnect the seventh switch K7 and the sixth switch K6, close the eighth switch K8 and the third starting switch CJ3, start the main voltage regulator 4 (V11-V15) to maintain the operation of the first resistor R1 and the second resistor R2. At this time, the temperature in the furnace rises, and the required starting voltage requirement is reduced, in order to improve the starting efficiency, the third resistor R3 and the fourth resistor R4 are started at the same time, the first starting switch CJ1, the ninth switch K9 and the eighth switch K8 are closed, the sub-voltage regulator 6 (VB1-VB2) is started to run, after the third resistor R3 and the fourth resistor R4 are broken, the ninth switch K9 and the eighth switch K8 are disconnected, the third starting switch CJ3 and the second switch K2 are closed, and the main voltage regulator 4 (V11-V15) is started to maintain the operation of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4; therefore, simply speaking, the current running path of the first resistor unit 1 at this time is: the third starting switch CJ3-the first resistor R1-the second resistor R2-the third resistor R3-the fourth resistor R4-the second switch K2.

[0061] For the third resistor unit 3: close the first starting switch CJ1, the fifth switch K5 and the fourth switch K4, start the sub-voltage regulator 6 (VB1-VB2) to run, after the eighth resistor R8 and the ninth resistor R9 are broken, disconnect the fifth switch K5, close the fourth starting switch CJ4, start the auxiliary voltage regulator 7 (VF1) to maintain the operation of the eighth resistor R8 and the ninth resistor R9. That is, the current running path of the third resistor unit 3 is changed from the first starting switch CJ1-the fifth switch K5-the ninth resistor R9-the eighth resistor R8-the fourth switch K4 to the fourth starting switch CJ4-the ninth resistor R9-the eighth resistor R8-the fourth switch K4. Among them, in order to ensure that the temperature of the eighth resistor R8 and the ninth resistor R9 does not decrease after the breakdown is completed, the auxiliary voltage regulator 7 is used to maintain the circuit loop.

[0062] For the second resistance unit: at this time, 6 pairs (4+2) of resistors have been broken down, and the temperature in the furnace is already very high. At this time, the three resistors in the second resistance unit 2 are broken down together, the first starting switch CJ1, the third switch K3 and the fourth switch K4 are closed, the auxiliary voltage regulator 6 (VB1-VB2) is started to operate in pressure, and after the fifth resistance R5, the sixth resistance R6 and the seventh resistance R7 are broken down, the second starting switch CJ2 is closed, and the auxiliary voltage regulator 6 (VB1-VB2) is started to maintain the operation of the fifth resistance R5, the sixth resistance R6 and the seventh resistance R7. That is, the current path of the second resistance unit 2 changes from the first starting switch CJ1-the third switch K3-the fifth resistance R5-the sixth resistance R6-the seventh resistance R7-the fourth switch K4 to the second starting switch CJ2-the third switch K3-the fifth resistance R5-the sixth resistance R6-the seventh resistance R7-the fourth switch K4.

[0063] Therefore, at this time, the resistance is completely broken down, and with the control of the process feed, the resistance continues to grow, the resistance value decreases, the voltage required to maintain the silicon core decreases, and the 4+2+3 pairs of resistors are converted from parallel operation to series operation. That is, the main voltage regulator 4 maintains the operation of 4 pairs of series resistors (4) through the third starting switch CJ3-the first resistance R1-the second resistance R2-the third resistance R3-the fourth resistance R4-the second switch K2, the auxiliary voltage regulator 6 maintains the operation of 3 pairs of series resistors (3) through the second starting switch CJ2-the third switch K3-the fifth resistance R5-the sixth resistance R6-the seventh resistance R7-the fourth switch K4, and the auxiliary voltage regulator 7 maintains the operation of 2 pairs of series resistors (2) through the fourth starting switch CJ4-the ninth resistance R9-the eighth resistance R8-the fourth switch K4. To: the main voltage regulator 4 maintains the operation of 9 pairs of series resistors through the first circuit breaker QF1-the first resistance R1-the second resistance R2-the third resistance R3-the fourth resistance R4-the third circuit breaker QF3-the fifth resistance R5-the sixth resistance R6-the seventh resistance R7-the eighth resistance R9-the ninth resistance R9-the second circuit breaker QF2.

[0064] Under this design, the capacity of the voltage regulating cabinet with load is improved, and each phase voltage regulating cabinet can carry 9 pairs of rods at most. The transformer 5 block tap changer operation is rotated to improve the utilization rate of the transformer tap.

[0065] It should be noted that the circuit provided by the present application is only one possible implementation, but is not limited to only this implementation. Users can set it up as needed.

[0066] The utility model provides a kind of power regulating cabinet, it include: first resistance unit, second resistance unit, third resistance unit, first switch, second switch, third switch, fourth switch and fifth switch, and resistance number in each resistance unit is at least one;Wherein, the first end of first resistance unit is connected with the output end of main voltage regulator, and the first end of first resistance unit is connected with the output end of boost module and the output end of auxiliary voltage regulator by first switch, the second end of first resistance unit is connected with the zero line end of restoration transformer by second switch;The first end of second resistance unit third switch is connected with the output end of auxiliary voltage regulator and the output end of boost module, and the first end of second resistance unit is connected with the second end of first resistance unit, the second end of second resistance unit is connected with the zero line end of restoration transformer by fourth switch;The first end of third resistance unit is connected with the output end of auxiliary voltage regulator and the output end of boost module by fifth switch, and the first end of third resistance unit is connected with the output end of auxiliary voltage regulator, the second end of third resistance unit is connected with the zero line end of restoration transformer by fourth switch, and the second end of third resistance unit is connected with the second end of second resistance unit.Obviously, the specific resistance number in each resistance unit of the present application improves the output of polysilicon without increasing the number of cabinet of voltage regulating cabinet, saves equipment and material investment, and simplifies power system configuration.Three groups of closed-loop controllers are used simultaneously, three resistance units are controlled respectively, and each closed-loop circuit does not affect each other.When feedback current does not reach set breakdown current, voltage closed-loop voltage limiting control is used, when feedback current reaches set breakdown current, current closed-loop constant current control is used, three closed-loop voltage limiting constant current controls are used, and the stability of power regulating cabinet is further improved.

[0067] To solve the above technical problems, the present application also provides a kind of polysilicon reduction furnace power supply device of multiple closed loops, as shown in Figure 3 It includes multiple above-mentioned power regulating cabinets (A1, A2, B1, B2, C1, C2), and also includes: reduction furnace 31, high-voltage transformer 32 and PLC control cabinet 33 containing ground detection.The output end of reduction furnace 31 is connected with the first input end of each power regulating cabinet;The output end of high-voltage transformer 32 is connected with the second input end of each power regulating cabinet;The control end of PLC control cabinet 33 is connected with the control end of each power regulating cabinet.

[0068] According to the power regulating cabinet described above, the polysilicon reduction furnace power supply device of multiple closed loops provided by the present application realizes 45 (6+9+6+9+6+9) pairs of rod reduction furnace power supply, greatly simplifies the power system configuration, and increases the output by 25% for 36 pairs of rods and 12.5% for 40 pairs of rods, without increasing the number of cabinets of voltage regulating power cabinet, compared with the prior art of 36 / 40 pairs of rods, saving equipment and material investment.

[0069] It should be noted that the embodiment of the multi-closed loop polycrystalline silicon reduction furnace power supply device provided by the present application is the same as the embodiment of the power adjusting cabinet, and the present application will not be repeated here.

[0070] The power adjusting cabinet and the multi-closed loop polycrystalline silicon reduction furnace power supply device provided by the present application are described in detail above. The embodiments in the specification are described in a progressive manner, and each embodiment mainly explains the differences from other embodiments. The same or similar parts of each embodiment can be referred to. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method part. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0071] It should be further noted that in the present specification, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A power control cabinet, characterized in that, The application relates to a voltage regulator, which comprises the following parts: a first resistance unit, a second resistance unit, a third resistance unit, a first switch, a second switch, a third switch, a fourth switch and a fifth switch; wherein the first end of the first resistance unit is connected with the output end of a main voltage regulator, and the first end of the first resistance unit is connected with the output end of a voltage boosting module and the output end of a secondary voltage regulator through the first switch, and the second end of the first resistance unit is connected with the zero line end of a restoring transformer through the second switch; the first end of the second resistance unit is connected with the output end of the secondary voltage regulator and the output end of the voltage boosting module through the third switch, and the first end of the second resistance unit is connected with the second end of the first resistance unit, and the second end of the second resistance unit is connected with the zero line end of the restoring transformer through the fourth switch; the first end of the third resistance unit is connected with the output end of the secondary voltage regulator and the output end of the voltage boosting module through the fifth switch, and the first end of the third resistance unit is connected with the output end of a tertiary voltage regulator, and the second end of the third resistance unit is connected with the zero line end of the restoring transformer through the fourth switch, and the second end of the third resistance unit is connected with the second end of the second resistance unit; wherein the main voltage regulator, the secondary voltage regulator and the tertiary voltage regulator are all composed of thyristor diodes; the application further comprises a third circuit breaker; wherein the first end of the third circuit breaker is connected with the second end of the first resistance unit, and the second end of the third circuit breaker is connected with the first end of the second resistance unit; the first resistance unit comprises a first resistance, a second resistance, a third resistance, a fourth resistance, a sixth switch, a seventh switch, an eighth switch and a ninth switch; wherein the first end of the first resistance is connected with the first end of the first switch and the output end of the main voltage regulator as the first end of the first resistance unit, and the second end of the first resistance is connected with the first end of the second resistance and the first end of the sixth switch; the second end of the second resistance is connected with the first end of the seventh switch, the first end of the eighth switch and the first end of the third resistance; the second end of the third resistance is connected with the first end of the fourth resistance; the second end of the fourth resistance is connected with the first end of the ninth switch, the first end of the second switch and the first end of the second resistance unit as the second end of the first resistance unit; the second end of the sixth switch is connected with the second end of the eighth switch, the second end of the second switch, the second end of the fourth switch and the zero line end of the restoring transformer; the second end of the seventh switch and the second end of the first switch, the second end of the ninth switch, the second end of the third switch, the second end of the fifth switch, the output end of the secondary voltage regulator and the output end of the voltage boosting module are connected; the second resistance unit comprises a fifth resistance, a sixth resistance and a seventh resistance; The first end of the fifth resistor is connected with the first end of the third switch and the second end of the first resistor unit as the first end of the second resistor unit, and the second end of the fifth resistor is connected with the first end of the sixth resistor; The second end of the sixth resistor is connected with the first end of the seventh resistor; The second end of the seventh resistor is connected with the second end of the third resistor unit and the first end of the fourth switch as the second end of the second resistor unit; The third resistor unit comprises an eighth resistor and a ninth resistor; The first end of the eighth resistor is connected with the second end of the second resistor unit and the first end of the fourth switch as the second end of the third resistor unit, and the second end of the eighth resistor is connected with the first end of the ninth resistor; The second end of the ninth resistor is connected with the first end of the fifth switch and the output end of the auxiliary voltage regulator as the first end of the third resistor unit.

2. The power management cabinet of claim 1, wherein, Further comprising: a first starting switch, a second starting switch, a third starting switch and a fourth starting switch; The first end of the first starting switch is connected with the first end of the second starting switch and the output end of the auxiliary voltage regulator, and the second end of the first starting switch is connected with the control end of the voltage boosting module; The second end of the second starting switch is connected with the output end of the voltage boosting module; The first end of the third starting switch is connected with the output end of the main voltage regulator, and the second end of the third starting switch is connected with the first end of the first resistor unit and the first end of the first switch; The first end of the fourth starting switch is connected with the output end of the auxiliary voltage regulator, and the second end of the fourth starting switch is connected with the first end of the fifth switch and the first end of the third resistor unit.

3. The power management cabinet of claim 2, wherein, Further comprising: a first circuit breaker and a second circuit breaker; The first end of the first circuit breaker is connected with the first end of the third starting switch and the output end of the main voltage regulator, and the second end of the first circuit breaker is connected with the second end of the third starting switch, the first end of the first resistor unit and the first end of the first switch; The first end of the second circuit breaker is connected with the zero line end of the restoration transformer, and the second end of the second circuit breaker is connected with the first end of the fifth switch and the first end of the third resistor unit.

4. A multi-closed loop polycrystalline silicon reduction furnace power supply apparatus, characterized by, The power regulating cabinet comprises a plurality of the power regulating cabinets according to any one of claims 1-3.

5. The multi-shuttered polycrystalline silicon reduction furnace power supply apparatus as claimed in claim 4, wherein Further comprising: a reduction furnace and a high-voltage transformer; The output end of the reduction furnace is connected with the first input end of each of the power regulating cabinets; The output end of the high-voltage transformer is connected with the second input end of each of the power regulating cabinets.

6. The multi-shuttered polycrystalline silicon reduction furnace power supply apparatus as claimed in claim 4, wherein Further comprising: a PLC control cabinet with ground detection; The control end of the PLC control cabinet is connected with the control end of each of the power regulating cabinets.

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