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Single-phase full-bridge inverter main circuit and single-phase full-bridge inverter

A single-phase full-bridge, inverter technology, applied in electrical components, AC power input into DC power output, output power conversion devices and other directions, can solve problems such as endangering system stability, affecting system stability, voltage changes, etc. Achieve the effect of improving system stability and reducing common mode interference

Pending Publication Date: 2022-02-18
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to make the photovoltaic inverter have better output characteristics and have the characteristics of high frequency, miniaturization, and light weight, high-speed power switching devices are widely used, but the voltage and current transients caused by the high-speed switching action will bring A serious electromagnetic interference, resulting in electromagnetic compatibility problems, affecting system stability, common mode interference is the dominant part
[0003] figure 1 It is a typical single-phase photovoltaic inverter topology in the prior art. The voltage changes at points A and B of the topology structure due to the frequent disconnection of IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), and the parasitic The capacitor is charged and discharged, causing a common-mode current in the loop, which endangers the stability of the system

Method used

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  • Single-phase full-bridge inverter main circuit and single-phase full-bridge inverter
  • Single-phase full-bridge inverter main circuit and single-phase full-bridge inverter
  • Single-phase full-bridge inverter main circuit and single-phase full-bridge inverter

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Embodiment 1

[0025] According to an embodiment of the present invention, a single-phase full-bridge inverter main circuit is provided, such as image 3 As shown, the main circuit of the single-phase full-bridge inverter described in the embodiment of the present invention includes: a first half-bridge arm, a second half-bridge arm, a first inductor, a second inductor, a first capacitor, and a second capacitor; The first half-bridge arm and the second half-bridge arm are connected in parallel to form a full-bridge circuit; the input end of the full-bridge circuit is connected to the DC bus voltage; one end of the first inductor is connected to the first half-bridge arm midpoint, the other end of the first inductance is connected to the negative pole of the DC bus voltage through the first capacitor; one end of the second inductance is connected to the midpoint of the second half-bridge arm, and the first The other end of the two inductors is connected to the negative pole of the DC bus volt...

Embodiment 2

[0055] According to an embodiment of the present invention, there is also provided a single-phase full-bridge inverter, including: a control system and the main circuit of the single-phase full-bridge inverter described in any one of Embodiment 1; the control system uses Controlling the turn-on and turn-off actions of the main circuit of the single-phase full-bridge inverter based on a preset modulation algorithm.

[0056] Wherein, the main circuit of the single-phase full-bridge inverter includes: a first half-bridge arm, a second half-bridge arm, a first inductor, a second inductor, a first capacitor, and a second capacitor; the first half-bridge arm connected in parallel with the second half-bridge arm to form a full-bridge circuit; the input end of the full-bridge circuit is connected to the DC bus voltage; one end of the first inductor is connected to the midpoint of the first half-bridge arm, and the first inductor The other end of an inductor is connected to the negativ...

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Abstract

The invention provides a single-phase full-bridge inverter main circuit and a single-phase full-bridge inverter, and relates to the technical field of inverters. The single-phase full-bridge inverter main circuit comprises a first half-bridge arm, a second half-bridge arm, a first inductor, a second inductor, a first capacitor and a second capacitor; the first half-bridge arm and the second half-bridge arm are connected in parallel to form a full-bridge circuit; the input end of the full-bridge circuit is connected with a direct-current bus voltage; one end of the first inductor is connected to the midpoint of the first half-bridge arm, and the other end of the first inductor is connected to the negative electrode of the direct-current bus voltage through the first capacitor; one end of the second inductor is connected to the middle point of the second half-bridge arm, and the other end of the second inductor is connected to the negative electrode of the direct-current bus voltage through the second capacitor; and an output voltage is formed between the other end of the first inductor and the other end of the second inductor to supply power to a load. According to the technical scheme provided by the invention, the common-mode interference can be effectively reduced, so that the system stability is improved.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to a main circuit of a single-phase full-bridge inverter and a single-phase full-bridge inverter. Background technique [0002] Photovoltaic inverter is one of the important equipment of photovoltaic power generation system, its performance directly affects the output characteristics of the whole system. With the rapid development of the new energy industry of photovoltaic power generation, higher requirements are put forward for the performance of photovoltaic products in all aspects. In order to make the photovoltaic inverter have better output characteristics and have the characteristics of high frequency, miniaturization, and light weight, high-speed power switching devices are widely used, but the voltage and current transients caused by the high-speed switching action will bring A serious electromagnetic interference caused by electromagnetic compatibility problems affects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M1/12
CPCH02M7/53871H02M1/126
Inventor 宋怀悠谢伟邓晓欧吴松吕卓姚仁马帅周俊智
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD