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Single-phase circuit topology structure for clamp multi-level converter

A topology, single-phase circuit technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of high requirements for clamping capacitor withstand voltage, large number, and rising converter costs. And other issues

Active Publication Date: 2008-09-10
TSINGHUA UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0032] The present invention is aimed at the existing clamping topology, which requires a large number of auxiliary clamping diodes when realizing multi-level output, or requires high withstand voltage and a large number of clamping capacitors, so that the cost of the converter is greatly increased. problem, a novel single-phase circuit topology for clamped multilevel converters is proposed

Method used

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  • Single-phase circuit topology structure for clamp multi-level converter
  • Single-phase circuit topology structure for clamp multi-level converter
  • Single-phase circuit topology structure for clamp multi-level converter

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Embodiment Construction

[0085] exist Figure 5 The single-phase topology includes 10 IGBT switching devices, 4 clamping diodes and a clamping capacitor. where S 1 with S 1 , S 2 with S 2 , S 3 with S 3 , S 4 with S4 , S 5 with S 5 are complementary switches respectively.

[0086] exist Image 6 The single-phase topology also includes 10 IGBT switching devices and a clamping capacitor, with Figure 5 Compared with the topology, 4 clamping diodes are saved. where S' 1 with S′ 1 , S' 2 with S′ 2 , S' 3 with S′ 3 , S' 4 with S′ 4 , S' 5 with S′ 5 are complementary switches respectively.

[0087] for Figure 5 For single-phase topology, when the output v o = 4V dc When the S 1 , S 2 , S 3 , S 4 , S 5 , the switching states of the rest of the switching tubes can be determined by the complementary relationship, that is, off S 1 , S 2 , S 3 , S 4 , S 5 . If the current flows from the inverter to the load, the current passes through the switch tube S 1 , S ...

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Abstract

The invention discloses a single-phase circuit topology structure used for a suppressing-typed convertor with multilevel and belongs to the electric and electronic technical field of the convertor with multilevel. The single-phase circuit topology structure is characterized in that a DC side is provided with three capacitors, the capacitors close to the DC side have a voltage of 4Vdc while the capacitor at the middle has a voltage of 2V dc; four diode suppressed parts are arranged at an input side and a capacitor suppressed part is arranged at an output side; through the adoption of the combination of switches, each switch has 1V dc voltage and five electric output levels can be obtained. The single-phase circuit topology structure of the invention has the advantages of much simplified structure and low voltage withstanding capacity and direct connection in series can occur in the circuit without involving with other elements and has no problem of synchronous connection and disconnection.

Description

technical field [0001] The invention relates to a power electronic multilevel topological structure, in particular to a voltage AC-DC-AC multilevel converter clamping topology. Background technique [0002] Multilevel converters are the development direction of high-voltage and large-capacity power conversion. Compared with ordinary two-level circuits, multilevel inverters have the following advantages: [0003] 1) The output voltage is closer to sinusoidal, and the voltage harmonic content is small. [0004] 2) The output voltage dv / dt is small, which has little impact on the insulation of the load (such as a motor), and at the same time greatly reduces the level of electromagnetic interference. [0005] 3) A high-voltage system is formed by a single tube with a low withstand voltage level, which solves the single-tube withstand voltage problem of the high-voltage system without requiring an additional transformer, greatly reducing the volume of the system. [0006] There...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/487
CPCH02M7/487H02M1/0095H02M7/4837
Inventor 李永东王琛琛高跃冯丽超
Owner TSINGHUA UNIV
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