Circuit with multilevel topology and power converter

Abstract

An embodiment of the invention provides a circuit with a multilevel topology, comprising five terminals and six switch components. A first end of a first switch component is connected with a first terminal, and a second end of the first switch component is connected with a fifth terminal; a first end of a second switch component is connected with a second terminal, and a second end of the second switch component is connected with a first end of a first branch; and a second end of a third switch component is connected with a third terminal, and a first end of the third switch component is connected with the first end of the first branch. A second end of a sixth switch component is connected with a fourth terminal, and a first end of the sixth switch component is connected with the fifth terminal; and a second end of the first branch is connected with the fifth terminal, wherein the first branch includes a fourth switch component and a fifth switch component which are reversely connected in series. According to the circuit with a multilevel topology provided by the embodiment of the invention, the withstand voltage required by the switch components is low, the performance is ensured, and the switch components with low withstand voltage are of low cost.

Description

technical field [0001] Embodiments of the present invention relate to the field of circuits, and more specifically, to a multilevel topology circuit and a power converter. Background technique [0002] In the medium-voltage and large-capacity field, the application of multi-level inverters has become more and more extensive. In the high-voltage DC bus system, the multi-level inverter can select a bus capacitor with a higher voltage resistance. At the same time, by increasing the output AC voltage, the output current at the same power can be reduced, thereby greatly reducing the cable load. cost. In addition, as the number of levels increases, the output ripple of the system will gradually decrease, which means that smaller filters can be used, which can increase the power density of the system and reduce the cost of the filter. Therefore, multi-level inverters have broad application prospects. [0003] However, in the multi-level topology adopted by the current multi-leve...

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Problems solved by technology

[0003] However, in the multi-level topology adopted by the current multi-level inverter, the withstand voltage required by the switching components is relatively high, which leads to a large loss during conduction, which in turn leads to low performance, and the withstand voltage Higher value switching components also lead to too high cost of multilevel inverters

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