Three-level rectifying level suitable for preceding stage of intelligent frequency drift water treatment power supply

Abstract

The invention discloses a three-level rectifying level suitable for the preceding stage of an intelligent frequency drift water treatment power supply, and particularly relates to the technical field of an intelligent frequency drift water treatment control system and a power electronic multi-level converter. The technical scheme is that the three-level rectifying level comprises a rectifying circuit, a chopping pulse circuit, a magnetic field and coil loop, a pipeline and a control system, the rectifying circuit is connected with the chopping pulse circuit, and the chopping pulse circuit is connected with the magnetic field and coil loop. The beneficial effects of the present invention are that in a unity power factor correction topology, a three-level structure consisting of two series switch tube bridge arms is connected in parallel, and two booster circuit units are arranged in a rectifier topology, so that the dual-boost characteristic is realized; in addition, the two inductors in the topological structure are respectively connected with the two series switch tube bridge arms, the rectifier can still work normally under the condition that any bridge arm breaks down, the power output to a rear stage can still be achieved, and the working reliability of a circuit is improved.

Description

technical field [0001] The invention relates to the fields of an intelligent frequency drift water treatment control system and a power electronic multilevel converter, in particular to a three-level rectification level suitable for the front stage of an intelligent frequency drift water treatment power supply. Background technique [0002] The intelligent frequency drift water treatment control system is advancing to a rectifier circuit. The traditional two-level rectifier circuit is gradually being replaced by a multi-level converter due to its high voltage stress and large input current harmonics. The multi-level rectifier circuit Compared with the traditional two-level rectifier circuit, it has the advantages of high efficiency, high reliability, high power density, low switching loss and lower harmonic and voltage stress. However, as the number of levels increases, the DC side series split capacitor The voltage will be more difficult to balance. At this time, complex co...

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Problems solved by technology

[0004] For this reason, the present invention provides a three-level rectification level suitable for the front stage of the intelligent frequency drift water treatment power supply. By adding a parallel switch tube bridge arm structure, the advanced rectification circuit topology has higher reliability. and the advantages of three-level converters to solve problems that require complex control methods or additional voltage self-balancing circuits

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