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A four-wire output converter and an inverter composed of the four-wire output converter

An output conversion and converter technology, applied in the field of two-stage inverters, can solve problems such as increasing the cost of the inverter, and achieve the effects of improving efficiency and reducing costs and losses

Active Publication Date: 2017-04-12
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pre-stage of ordinary booster greatly increases the cost of the inverter, and all the electric energy has to be boosted and converted, which requires a large loss

Method used

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  • A four-wire output converter and an inverter composed of the four-wire output converter
  • A four-wire output converter and an inverter composed of the four-wire output converter
  • A four-wire output converter and an inverter composed of the four-wire output converter

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Embodiment approach

[0077] Such as Figure 15 As shown, it is an embodiment of the four-wire output converter provided by the present invention, which consists of the first DC power supply S1, the second DC power supply S2, the first capacitor C1 and the second capacitor C2, the first converter Cv1, The second converter Cv2 is composed of clamping capacitors between two power supplies, wherein the clamping capacitors between the two power supplies are the fifth capacitor C5 and the sixth capacitor C6, which are powered by the first power supply line P, the second power supply line MP, and the third power supply line The line MN and the fourth supply line N supply power to the load. Both ends of the first DC power supply S1 are connected to both ends of the first capacitor C1, and both ends of the second DC power supply S2 are connected to both ends of the second capacitor C2. The positive pole of the first capacitor C1 is connected to the first power supply line P, the positive pole of the secon...

Embodiment approach 2

[0082] Such as Figure 16 The implementation mode of a two-stage inverter is shown, which is composed of a four-wire output converter of the previous stage and a four-input terminal inverter circuit of the latter stage, and the four-wire output converter of the former stage provides the Four-input multi-level inverter circuit supplies power.

[0083] The four-wire output converter of the preceding stage is basically the same as Embodiment 1, the difference lies in:

[0084] (1) The first converter Cv1 uses the negative voltage form of the half-bridge bidirectional DC converter, the input terminal of the first converter Cv1 is connected to the negative terminal of the first capacitor C1, and the output terminal of the first converter Cv1 is connected to the second power supply line MP, the common terminal of the first converter Cv1 is connected to the first power supply line P. The first converter Cv1 can not only step-down transform the electric energy from both ends of the ...

Embodiment approach 3

[0094] Figure 17 Shown is the third embodiment of the present invention, which is a two-stage inverter connected to a three-phase four-wire system load. It consists of an inverter circuit at the input end, and the four-wire output converter at the front stage supplies power to the inverter circuit at the rear stage through four wires.

[0095] This embodiment 3 is basically the same as the above embodiment 2, the difference lies in:

[0096] (1) Added the generation branch of the midline connection point to generate the midline connection point Vm. Inverters connected to three-phase four-wire loads and single-phase inverters with single-wire output need to provide a neutral connection point Vm.

[0097] (2) The four-wire output converter of the preceding stage is basically the same as Embodiment 2, except that the third capacitor C3 is used as the clamp capacitor between the power supplies, and the capacitor composed of the seventh capacitor C41 and the eighth capacitor C42...

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Abstract

The invention provides a four-wire output converter comprising a first DC power supply, a second DC power supply, a first capacitor, a second capacitor, a first converter, a second converter and at least one inter-power supply clamped capacitor. A load is powered through a first power supply wire, a second power supply wire, a third power supply wire and a fourth power supply wire. The invention further provides a two-stage inverter comprising the four-wire output converter as the preceding converter and a backward four-input inverter. The four-wire output converter is exactly suitable for matching with certain backward four-input load circuits, so that the preceding four-wire output converter compared with the preceding two-wire output conversion circuit has current to be converted, greatly reduced, the cost and loss of the preceding converter is greatly lowered, and efficiency is improved; meanwhile, at the premise of ensuring three-level circuit complexity, switching loss of a backward inversion circuit is further reduced.

Description

[0001] manual technical field [0002] The invention relates to an inverter, a circuit for converting direct current into alternating current, in particular to a two-stage inverter whose front stage is a four-wire output converter. Background technique [0003] An inverter is an electronic device that converts direct current into alternating current. Usually, the DC input voltage of the inverter will vary within a certain range. For example, the rated voltage of a solar cell array is related to the number of solar cell modules connected in series. Considering the convenience of forming an array, the rated voltage is allowed to be selected within a certain range. The voltage of the actual solar cell array will further vary greatly with temperature and light. [0004] In order to better adapt to the characteristics of large changes in DC input voltage, some inverters choose a two-stage circuit composed of a front-stage boost conversion circuit and a rear-stage inverter circui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/06H02M7/483H02M7/5387
CPCH02M3/06H02M7/483H02M7/5387
Inventor 张宇翔郭敏
Owner ZHENGZHOU UNIV