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A Novel Single-Phase Hybrid Three-Level Rectifier

A three-level rectification, single-phase technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problem of high harmonic content of input current, low rectifier efficiency, and power density Low-level problems, to achieve the effect of improving conversion efficiency, high power density, and high power factor

Active Publication Date: 2020-02-14
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the rectifier's shortcomings of low efficiency, low power density, low reliability, low power factor, and high harmonic content of input current

Method used

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  • A Novel Single-Phase Hybrid Three-Level Rectifier
  • A Novel Single-Phase Hybrid Three-Level Rectifier
  • A Novel Single-Phase Hybrid Three-Level Rectifier

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Embodiment Construction

[0038] A novel single-phase hybrid three-level rectifier, including a single-phase uncontrollable diode rectifier bridge, a filter, and a VIENNA modified rectifier bridge, and the single-phase uncontrollable diode rectifier bridge includes a diode D 3 、D 4 、D 4 、D 5 、D 6 The rectification part formed by connection, the rectification part is connected to the inductance L 1 One end, inductance L 2 One end, the inductance L 1 The other end is connected to the anode of diode D7 and the switch tube S Fa drain, inductance L 2 The other end is connected to the switch tube S Fa Source, diode D8 cathode, diode D7 cathode, diode D8 anode are respectively connected to load R L ends.

[0039] The filter includes a filter inductance L, and the filter inductance L is connected in series between the AC power supply and the VIENNA modified rectifier bridge;

[0040] The VIENNA modified bridge rectifier includes a diode D 1 、D 2 , capacitance C p 、C n , two Mos tubes S in reverse...

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Abstract

A new single-phase hybrid three-level rectifier comprises a single-phase uncontrollable diode rectifier bridge, a filter, a single-phase VIENNA rectifier bridge, a voltage and current sampling circuit, and a signal conditioning circuit. Through employing the above structure and a single-period control algorithm, the rectifier is simple in control method, is simple in structure, and just needs to collect an output voltage and an input current. The rectifier is very high in robustness, is high in power density, is large in power factor, is stable in output voltage, and is high in system reliability. Compared with a conventional single-phase rectifier, the rectifier provided by the invention can greatly improve the conversion efficiency, is large in application range, can greatly reduce the voltage stress of a power switching tube through employing the three-level structure, and can save a large amount of material resources and financial resources.

Description

technical field [0001] The invention relates to the field of single-phase electric energy conversion, in particular to a novel single-phase hybrid three-level rectifier. Background technique [0002] Nowadays, rectification is ubiquitous, and rectifiers are used in all power levels, so the research and improvement of rectifiers is very necessary. There are also many rectification methods that are most commonly used at present, such as uncontrolled diode full-bridge rectification, PWM rectification, synchronous rectification, etc., but there is a serious problem with uncontrolled rectification that the current harmonic content at the input terminal is very rich, and this has a great impact on the power grid. The danger is very great. PWM rectification is a good way to improve this shortcoming. It has low harmonic content and high power factor. With the development of rectification technology, the idea of ​​multi-level has been proposed, which greatly reduces the voltage str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 马辉危伟赵金刚冯茂
Owner CHINA THREE GORGES UNIV
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