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Multi-level circuit, three-phase multi-level circuit, and control method

A multi-level and circuit technology, applied in the multi-level field, can solve the problems of high withstand voltage performance of semiconductor switches, large number of bus capacitor groups, complex circuit topology, etc.

Active Publication Date: 2017-09-12
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology

[0005] The present application provides a multi-level circuit, a three-phase multi-level circuit and a control method to solve the problems caused by the high withstand voltage performance of the semiconductor switch and the large number of busbar capacitors existing in the existing multi-level circuit. topologically complex problems

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  • Multi-level circuit, three-phase multi-level circuit, and control method
  • Multi-level circuit, three-phase multi-level circuit, and control method
  • Multi-level circuit, three-phase multi-level circuit, and control method

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0038] The embodiment of the present application discloses a five-level circuit, see figure 2 with image 3 ,include:

[0039] Capacitor C1, capacitor C2, switch tube Q1 ~ switch tube Q8, switch tube Q13 ~ switch tube Q16, coupling inductor L1 and coupling inductor L2; where:

[0040] Capacitor C1 and capacitor C2 are DC side bus capacitors, which are connected in series to form capacitor branches, and capacitor C1 and capacitor C2 are connected in series. The common terminal is grounded. Optionally, the capacitors C1 and C2 may be electrolytic capacitors, and of course other types of capacitors may also be used. Moreover, the capacitor C1 and the capacitor C2 can be designed as a capacitor with relatively large capacitance, or can be designed to be formed by connecting s...

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Abstract

The invention provides a multi-level circuit, a three-phase multi-level circuit, and a control method. Two busbar capacitors are disposed in the multi-level circuit, and the number of the busbar capacitors is reduced, and complexity of circuit design is reduced. Each switch tube branch circuit is formed by two half-bridges, and the common end of the two half-bridges is grounded, and then voltage difference reduction of switch tubes is guaranteed, and therefore requirements of low level voltage-withstanding device used by the circuit are satisfied.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to multilevel technology. Background technique [0002] Nowadays, in the field of power electronics technology, people have higher and higher requirements on the working efficiency of UPS (Uninterruptible Power System, uninterruptible power supply) or inverter and other power supply equipment. According to calculations, if the efficiency of UPS is increased by 1%, data centers all over the world can save 300 million kWh of electricity. Therefore, how to improve the efficiency of power supply equipment has become an urgent problem to be solved in the industry. [0003] As we all know, multi-level technology can effectively reduce the loss of semiconductor devices and magnetic devices, and significantly improve the efficiency of equipment. It has been widely used in recent years. At present, most UPS adopt three-level technology. Using four-level or five-level te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487H02M7/5387
CPCH02M7/487H02M7/5387H02M1/0038H02M7/483H02M1/0074
Inventor 黄朱勇张晓飞张春涛
Owner HUAWEI DIGITAL POWER TECH CO LTD
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