Multi-phase variable-frequency power source

Abstract

The invention provides a multi-phase variable-frequency power source. The multi-phase variable-frequency power source comprises a self-coupling transformer and multiple power module units for realizing a frequency conversion effect, wherein one primary side of the self-coupling transformer is a three-phase winding connected with a power grid, a secondary side of the self-coupling transformer is provided with two three-phase windings, each power module unit comprises three groups of circuits, each group of circuits comprise two three-phase full-wave rectifier circuits which are in anti-parallel, the same-phase ends of outputs of the three groups of circuits are connected with one another, bridge arms of the three-phase full-wave rectifier circuits are controllable power devices, one primary side of the self-coupling transformer is connected with the first group of circuits of the power module units, and the two three-phase windings of the secondary side of the self-coupling transformer are connected with the second groups of circuits and the third group of circuits of the power module units. The multi-phase variable-frequency power source has the advantages that the frequency conversion and inversion are effectively realized, and the bidirectional flow of energy is realized; the variable-frequency power source with different phase numbers is obtained by increasing and decreasing the number of the power module units; a unidirectional silicon controlled rectifier is adopted, so that the circuit topology structure of a full-controlled device is changed, the manufacturing cost is greatly reduced, and the efficiency is improved; and the losses are reduced during frequency conversion due to the adoption of the silicon controlled rectifier, and the multi-phase variable-frequency power source is concise and reasonable in technological structure, low in cost and high in efficiency.

Description

technical field [0001] The invention relates to a multi-phase variable-frequency power supply, which belongs to the technical fields of multi-phase variable-frequency power supply and power electronics, and in particular relates to a multi-phase motor variable-frequency drive and a variable-frequency power supply. Background technique [0002] With the development of modern inverter technology, new technology has been widely used in industrial equipment. Frequency conversion technology has the advantages of excellent energy saving effect, convenient operation, easy installation and maintenance, etc. Explosion-proof frequency converter, its heat dissipation system accounts for a considerable proportion in terms of cost. If the loss of frequency conversion can be greatly reduced, and the heat dissipation design can be simplified as much as possible, the cost can be significantly reduced, and at the same time, it can be used conveniently. The loss of the frequency converter mad...

AI Technical Summary

Problems solved by technology

The loss of the frequency converter made of the commonly used power device IGBT is about 2-3%, and it is not easy to reduce the loss to less than 1%, otherwise the cost will increase significantly to achieve

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