Converter circuit comprising distributed energy stores

Abstract

The invention relates to a converter circuit comprising at least one phase module (100) having an upper and a lower converter valve (T1, ..., T6), wherein each converter valve (Tl, ..., T6) has at least one two-pole subsystem. According to the invention, each two-pole subsystem (14) has four semiconductor switches (21, 23, 25, 27), which can be switched off and are connected electrically in series, four diodes (22, 24, 26, 28), which are each connected electrically back-to-back in parallel with one semiconductor switch (21, 23, 25, 27) which can be switched off, two unipolar storage capacitors (29, 30), which are connected electrically in series and in parallel with the series circuit comprising the semiconductor switches (21, 23, 25, 27), and an electronic system (32), whose reference potential connection (M) is electrically conductively connected to a common potential (P0).; This results in a subsystem (14), at whose connection terminals (X2, Xl) it is possible to generate a terminal voltage (UX21) having four potential stages, which requires only one electronic system (32), whose energy supply takes place symmetrically, and which does not require any increased complexity in terms of potential isolation.

Description

technical field [0001] The invention relates to a converter circuit according to the preamble of claim 1 . Background technique [0002] This type of converter circuit is disclosed in DE 10103031 A1, and the equivalent circuit diagram of this converter circuit is shown in detail in FIG. 1 . As shown in this equivalent circuit diagram, the known converter circuit has three phase modules, each denoted by 100 . The DC voltage terminals of these phase modules 100 are respectively connected to the positive and negative DC voltage buses P 0 and N 0 Conductively connected. The two DC voltage buses P 0 and N 0 There is a DC voltage without a reference symbol between them. Each phase module 100 has an upper diverter valve T1 , T3 , T5 and a lower diverter valve T2 , T4 , T6 . Each of these variable flow valves T1 to T6 has a certain number of two-pole subsystems 11 connected in series. This equivalent circuit diagram illustrates four of the subsystems 11 . Instead of the two...

AI Technical Summary

Problems solved by technology

As a result, the control of the switchable semiconductor switches 1 and 3, 5 and 7 of the integrated subsystems 11, 12 and the control of the capacitor voltage U C Expenses for potential separation during detection, in addition to very unfavorable asymmetrical voltage distribution

[0015] By combining at least two two-pole subsystems 11, 12 into one subsystem module, the number of optical waveguides used can be halved, but at the same time more complex potential separation and asymmetric energy supply must be carried out

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