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A multi-level inverter system that generates power-frequency alternating current controlled by a high-frequency switch

A multi-level inverter and switching technology, which is applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the difficulty of transformer design, increase loss and cost, and not reduce power Device voltage stress and other issues

Active Publication Date: 2021-10-29
FONRICH NEW ENERGY TECH LTD
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  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of multiple technology is that it requires specially designed input and output transformers, which not only increases the cost of the system, but also reduces the efficiency of the system, and when the number of inverters increases, the design of the transformer will be very difficult
The disadvantage is that a power frequency transformer is still required, which increases loss and cost, and does not reduce the voltage stress of power devices

Method used

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  • A multi-level inverter system that generates power-frequency alternating current controlled by a high-frequency switch
  • A multi-level inverter system that generates power-frequency alternating current controlled by a high-frequency switch
  • A multi-level inverter system that generates power-frequency alternating current controlled by a high-frequency switch

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Embodiment Construction

[0071] The technical solutions of the present invention will be clearly and completely explained below with reference to the various embodiments. The described embodiments are only used for the description of the present invention rather than all the embodiments. The solutions obtained by the technical personnel without creative work all belong to the protection scope of the present application.

[0072] see Figure 1A As shown, with the rapid development of control theory, power electronics technology, and semiconductor technology, finding inverters with lower cost and higher efficiency to realize single-phase or multi-phase alternating current has become a hot spot in power electronics. The level inverter circuit has attracted great attention in the industry and in the field of medium and high-power AC motor speed regulation. It has many advantages such as small harmonic distortion, low semiconductor device stress, and low electromagnetic interference of the inverter system....

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Abstract

The present invention mainly relates to a multi-level inverter system that generates power-frequency alternating current controlled by a high-frequency switching switch. The multi-level inverter generates a multi-level output voltage under the drive of a control signal with a first frequency, and the output stage circuit is The voltage reference for switching the multi-level output voltage is driven by a control signal having a second frequency. A multilevel inverter has the first half cycle of the alternating current when the output stage is switched to the first reference potential, and a multilevel inverter has the first half cycle of the alternating current when the output stage is switched to the second reference potential. For the second half cycle, the first and second half cycles are combined into a single cycle.

Description

technical field [0001] The invention mainly relates to the technical field of inverters, to be precise, to provide an inverter system capable of outputting power frequency alternating current and a corresponding inverter scheme in a topology structure involving a multi-level inverter circuit. Background technique [0002] After nearly half a century of rapid development since its birth in the 1950s, power electronics technology has been widely used in various fields that require electrical energy conversion. It has become more and more serious, and the energy conversion in the field of photovoltaic power generation is also increasingly used in inverter systems. In the field of low-voltage and low-power power consumption, power electronics technology has gradually matured, and high power density, high efficiency and high performance have become mainstream, while high-voltage and high-power industrial and power transmission and distribution technology is becoming the research ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/53873H02M7/4835
Inventor 张永高波胡晓磊
Owner FONRICH NEW ENERGY TECH LTD