Connection mode of heavy-current parallel switch in direct current reducing system for preparing polycrystalline silicon

Abstract

The invention discloses a novel connection mode of a heavy-current parallel switch in a direct current reducing system for preparing polycrystalline silicon, aims to overcome the defects of the conventional connection mode of the heavy-current parallel switch, and provides a new connection mode. The connection mode is characterized in that three two-pole switches with the same type are selected and used, wherein the left pole of the switch 1 is equivalent to a single pole switch K1; the right pole of the switch 1 and the left pole of the switch 2 are connected in parallel and are equivalent to a two-pole switch K2; the right pole of the switch 2 and the left pole of the switch 3 are connected in parallel and are equivalent to the two-pole switch K3; and the right pole of the switch 3 is equivalent to the single pole switch K4. By using the new switch connection mode, connection bars can get in from the top and get out from the bottom or get in from the bottom and get out from the top;and the connection mode of equipment is greatly simplified and equipment cost is reduced while the parallel connection of the switches under the condition of heavy current is realized.

Description

technical field [0001] The invention relates to the parallel connection mode of multiple power sources in a novel DC reduction system for preparing polysilicon, in particular to the selection of a large current parallel switch and its connection mode when multiple power sources are in parallel operation. Background technique [0002] The DC reduction system for preparing polysilicon has the advantages of high power factor, low power consumption, and high-quality growth of silicon rods, and has great market promotion significance. The polysilicon reduction process requires a large current in the later stage, and in the DC reduction system, 3 power supplies can be used in parallel to provide a large current. [0003] figure 1 It is a circuit schematic diagram of 3 power supplies connected in parallel. Three power U 1 , U 2 and U 3 The positive U 1+ , U 2+ and U 3+ available via switch K 1 and K 2 connection, negative pole U 1- , U 2- and U 3- available via switch ...

AI Technical Summary

Problems solved by technology

[0009] The disadvantages of using this switch connection method mainly include: a large amount of connection bars, high cost, large volume, and too complicated connection methods, etc.

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