A polysilicon reduction furnace power supply system and its control method

Abstract

The invention relates to a polysilicon reduction furnace power supply system and its control method, which breaks down the silicon core and supplies power to maintain the heating of the silicon core, including a main transformer, an output adjustment unit, a start-up breakdown unit, and a power adjustment unit. The starting breakdown unit includes at least two groups; wherein, the output terminal of the main transformer is electrically connected to the power adjustment unit and the input terminals of at least two groups of starting breakdown units; the output terminals of at least two groups of starting breakdown units are adjusted through the output The unit is electrically connected to the silicon core, and the silicon core is broken down through the isolation step-up transformer; the output terminal of the power adjustment unit is electrically connected to the silicon core through the output adjustment unit, which is used to supply power to the broken down silicon core and maintain heating. The invention mainly improves the stability of the power supply system, saves the high-voltage breakdown time of the silicon core, reduces the overall cost of the power supply system of the polysilicon reduction furnace, and improves the production efficiency of the polysilicon.

Description

Technical field [0001] The present invention relates to the field of polycrystalline silicon production power supply technology, and more particularly to a polysilicon further furnace power supply system and a control method thereof. Background technique [0002] Polysilicon also originally included high-pressure starting power supplies, power power supplies, first using high-pressure starting power supply to perform high pressure breakdown of each silicon core, and then continuously heat through the power supply. Due to the high-pressure starting power supply only works in the pressure breakdown phase of the silicon core, there is less equipped, and the amount of silicon cores produced by a single reduction furnace need to produce a long pressure breakdown time. In addition, the boost transformer of the conventional high-pressure start-up power supply is controlled by the transformer by the thyristor, and there is a continuous angle, the thyristor output voltage is unsmorled, an...

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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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