Full-automatic smelting control system and control method for polycrystalline silicon

Abstract

The invention discloses a full-automatic smelting control system and a control method for polycrystalline silicon. The system structurally comprises a programmable logic controller (PLC), a medium-frequency power distribution board, a polycrystalline silicon smelting crucible temperature device, a current power and temperature digital display device, a sensor and a 4-20MA current signal generator. The system and the method have the advantages that firstly, a mode of whole-process temperature measurement and heating on a wall of a crucible by a thermocouple of a medium-frequency induction furnace is adopted, process-related power and frequency of a medium-frequency power supply and real-time smelting temperature of polycrystalline silicon can be all converted into digital signals through the sensor, the digital signals are transmitted to a PLC system, the PLC system can perform PID (proportion integration differentiation) regulation on the parameters according to process requirements of polycrystalline silicon, and an output result can accurately control various performance indexes of polycrystalline silicon, so that the rejection rate of products is greatly reduced; secondly, the labor intensity is reduced; thirdly, the production efficiency is improved; fourthly, potential safety hazards are reduced.

Description

technical field [0001] The invention relates to a polycrystalline silicon full-automatic smelting control system and a control method, belonging to the technical field of high-tech material smelting. Background technique [0002] Most of the existing polysilicon smelting controls are open-loop control methods, that is, completely rely on manual operation. Due to the long smelting cycle of polysilicon materials, the intermediate frequency power supply is completely operated manually, and the labor intensity is too high; when it is completely operated manually, the control accuracy is not high, and the product quality cannot be fully guaranteed. Contents of the invention [0003] The present invention proposes a polysilicon fully automatic smelting control system and control method, the purpose of which is to overcome the above-mentioned defects existing in the prior art, and realize full-automatic smelting control of power and temperature closed-loop formula mode. [0004]...

AI Technical Summary

Problems solved by technology

Due to the long smelting cycle of polysilicon materials, the intermediate frequency power supply is completely operated manually, and the labor intensity is too high; when it is completely operated manually, the control accuracy is not high, and the product quality cannot be fully guaranteed.

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