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A five-level inverter unit and its application circuit

An inverter unit, five-level technology, applied in electrical components, high-efficiency power electronic conversion, AC power input conversion to DC power output, etc., can solve the problem of large loss, reduce on-state loss, and improve system efficiency Effect

Active Publication Date: 2020-08-28
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a five-level inverter unit and its application circuit to solve the problem of large loss in the prior art

Method used

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  • A five-level inverter unit and its application circuit
  • A five-level inverter unit and its application circuit
  • A five-level inverter unit and its application circuit

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Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0044] The invention provides a five-level inverter unit and its application circuit to solve the problem of large loss in the prior art.

[0045] See figure 1 , the five-level inverter unit is connected between the positive terminal PV+ and the negative terminal PV− of the DC power supply, and is connected in parallel with the series branch of the first capacitor C1 and the second capacitor C2.

[0046] Specifically, the five-level inverter unit includes: a switching tube unit, a cl...

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Abstract

The present invention provides a five-level inverter unit and its application circuit. A first controllable switch is provided between the first input terminal and the first output terminal of the switch tube unit, and the third input terminal of the switch tube unit A second controllable switch is set between the second output terminal, so that in some working modes, the corresponding controllable switch can be used instead of the two switch tubes in the switch tube unit to conduct, thereby reducing on-state loss and improving system efficiency .

Description

technical field [0001] The invention relates to the technical field of photovoltaic new energy, in particular to a five-level inverter unit and an application circuit thereof. Background technique [0002] Multi-level inverter, because of its high output power, low switching frequency of devices, high equivalent switching frequency of the system, small output harmonics, fast dynamic response, wide transmission frequency bandwidth, good electromagnetic compatibility, and light weight of photovoltaic inverters , Small size and high efficiency are more and more valued by the photovoltaic industry. [0003] In the new energy field of photovoltaic power generation, because the system voltage of components is further increased to 1500V, the traditional two-level and three-level topologies are no longer applicable. The five-level inverter topology, but its turn-on and turn-off needs to go through three switch tubes, and the loss is relatively large. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/0054Y02B70/10
Inventor 耿后来文鹏周银银曹金虎
Owner SUNGROW POWER SUPPLY CO LTD