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Bidirectional DC-AC converter

A DC-AC and converter technology, applied in the field of bidirectional DC-AC converters, can solve problems such as inability to take into account both inverter boost and energy bidirectional flow, system complexity, etc., to achieve reduced implementation costs, high application value, and improved application effect of ability

Active Publication Date: 2019-12-13
GPOWER SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to propose a bidirectional DC-AC converter to solve the problem that the existing DC-AC converter cannot take into account the problem of inverting and boosting and the bidirectional flow of energy and the problem of complex systems, while realizing DC - Two functions of DC conversion and DC-AC conversion to realize the bidirectional flow of DC / AC converter energy and simplify the system structure

Method used

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Examples

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Embodiment 1

[0030] figure 1 A system block diagram of a bidirectional DC / AC converter provided in Embodiment 1 of the present invention. Such as figure 1 As shown, the bidirectional DC-AC converter includes a first filter module 2 , a power conversion module 4 , a second filter module 5 and a DC bus capacitor 3 .

[0031] Wherein, the power conversion module 4 includes a bidirectional conduction switch unit 7, an H-bridge DC / AC conversion unit 8 and a control unit 9;

[0032] The bidirectional conduction switch unit 7 is electrically connected to the first filter module 2, the H-bridge DC / AC conversion unit 8, the second filter module 5 and the control unit 9, and is used to control the bidirectional flow of energy in the bidirectional DC-AC converter;

[0033] The DC bus capacitor 3 is electrically connected to the H-bridge DC / AC conversion unit 8 for storing energy and providing a DC bus voltage;

[0034] The H-bridge DC / AC conversion unit 8 is used for DC boost and AC inverter or AC...

Embodiment 2

[0044] Based on the first embodiment, the second embodiment optimizes the design of the switch tube unit, the first filter module, the second filter module and the control unit, and specifically proposes a single-phase bidirectional DC-AC converter. figure 2 A schematic diagram of a single-phase bidirectional DC / AC converter provided in Embodiment 2 of the present invention. Such as figure 2 As shown, in the single-phase bidirectional DC-AC converter, the H-bridge DC / AC conversion unit 7 includes a single-phase H-bridge DC / AC conversion circuit, the bidirectional conduction switch unit 8 includes two conduction branches, and the second filter Module 5 includes a single-phase filter circuit.

[0045] Specifically, the H-bridge DC / AC conversion unit 7 includes a first complementary bidirectional power switch and a second complementary bidirectional power switch, and the first complementary bidirectional power switch includes a first switching tube unit S 1 and the second swi...

Embodiment 3

[0070] Figure 10 A schematic diagram of a three-phase bidirectional DC / AC converter provided in Embodiment 3 of the present invention. The difference between this embodiment and Embodiment 2 is that the H-bridge DC / AC conversion unit includes a three-phase H-bridge DC / AC conversion circuit, the bidirectional conduction switch unit includes three conduction branches, and the second filter module includes a three-phase filter circuit .

[0071] Specifically, such as Figure 10 As shown, in the three-phase bidirectional DC / AC converter, the H-bridge DC / AC conversion unit includes a first complementary bidirectional power switch, a second complementary bidirectional power switch and a third complementary bidirectional power switch, and the first complementary bidirectional power switch includes The first switching tube unit S 1 and the fourth switching tube unit S 4 , the second complementary bidirectional power switch includes a third switching tube unit S 3 and the sixth s...

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Abstract

The invention discloses a bidirectional DC-AC converter. The bidirectional DC-AC converter includes a first filter module, a power conversion module, a second filter module, and a DC bus capacitor. The power conversion module includes a bidirectional conducting switch unit, an H-Bridge DC / AC conversion unit and a control unit. The bidirectional conducting switch unit is electrically connected to the first filter module, the H-bridge DC / AC conversion unit, the second filter module and the control unit, and is used for controlling the bidirectional energy flow in the bidirectional DC / AC converter. The DC bus capacitor is electrically connected to the H-bridge DC / AC conversion unit for energy storage and supply of a DC bus voltage. The H-bridge DC / AC conversion unit is used for DC boost and AC inversion, or AC rectification and DC step down. The bidirectional DC-AC converter solves the problem that an existing DC-AC converter cannot take into account both the inversion boost and the bidirectional energy flow.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power electronics, and in particular to a bidirectional DC-AC converter. Background technique [0002] DC / AC converters are widely used in motor speed regulation, distributed power generation systems and uninterruptible power supplies. Traditional DC / AC converters include voltage source DC / AC converters and current source DC / AC converters. The AC voltage output by the voltage source DC / AC converter is lower than the DC bus voltage, and it is essentially a step-down DC / AC converter. In order to realize the boost function during inversion conversion, an additional The boost conversion circuit makes the overall structure of the system complex. The current source DC / AC converter is essentially a step-up DC / AC converter, but it can only realize one-way transmission of energy, and does not have the function of two-way transmission of energy. In applications such as microgrids and energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797
CPCH02M7/797
Inventor 胡茂朱永生裴轶
Owner GPOWER SEMICON
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