Polycrystalline silicon reduction furnace power supply system and control method thereof

Abstract

The invention relates to a polycrystalline silicon reduction furnace power supply system and a control method thereof. The polycrystalline silicon reduction furnace power supply system breaks down a silicon core and supplies power to the silicon core to maintain heating; the polycrystalline silicon reduction furnace power supply system comprises a main transformer, an output adjusting unit, at least two sets of starting breakdown units and a power adjusting unit; the output end of the main transformer is electrically connected with the input ends of the power regulation unit and the at least two sets of starting breakdown units; the output ends of the at least two sets of starting breakdown units are electrically connected with the silicon core through the output adjusting unit, and the silicon core is broken down through an isolation boosting transformer; and the output end of the power adjusting unit is electrically connected with the silicon core through the output adjusting unit, and the power adjusting unit is used for supplying power to the broken-down silicon core to maintain heating. The stability of the power supply system is mainly improved, the high-voltage breakdown time of the silicon core is saved, the overall cost of the polycrystalline silicon reduction furnace power supply system is reduced, and the production efficiency of polycrystalline silicon is improved.

Description

technical field [0001] The invention relates to the technical field of power supply for polysilicon production, in particular to a power supply system for a polysilicon reduction furnace and a control method thereof. Background technique [0002] The power supply system of the polysilicon reduction furnace mainly includes a high-voltage start-up power supply and a power supply. Firstly, the high-voltage start-up power supply is used to conduct high-voltage breakdown of each silicon core in turn, and then the power supply is used to continuously heat the silicon core. Since the high-voltage start-up power supply only works in the stage of crushing and breaking down silicon cores, the number of equipment is small, and a single reduction furnace needs to produce a large amount of silicon cores, and the time for crushing and breaking down silicon cores is long. In addition, the step-up transformer of the traditional high-voltage starting power supply is boosted by the thyristor ...

AI Technical Summary

Problems solved by technology

[0004] 1. VB1 and VB2 are not only used for high-voltage breakdown of the silicon core, but also for maintaining the silicon core in a hot state. During the breakdown operation, the current of the silicon core flows through the main transformer coil and the autotransformer TM coil at the same time. The silicon cores of the two transformers share N, resulting in instability of the VB1 and VB2 loops;

[0005] 2. For the silicon core production of six pairs of rods, only one step-up transformer is used for breakdown, that is, the autotransformer TM. There is only one set of voltage boost combinations, and it cannot meet the combination of various output voltages and input voltages; in addition, After the silicon core R1-R4 breaks down, the V1-V5 gear enters to maintain conduction. At this time, the output voltage of the main transformer needs to meet the working voltage of four silicon cores connected in series;

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