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Single-stage bidirectional buck-boost inverter

A buck-boost and inverter technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. , to simplify the structure and achieve the effect of two-way transmission of energy

Inactive Publication Date: 2013-05-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with voltage source and current source inverters, Z-source inverters can provide the function of buck-boost conversion, but they also cannot achieve bidirectional energy transmission, and at the same time introduce additional passive components composed of inductors and capacitors. increases system size, weight and implementation cost while controlling complex

Method used

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Examples

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specific Embodiment 1

[0044] Specific embodiment 1: a single-stage single-phase bidirectional buck-boost inverter (1).

[0045] Such as figure 2 The shown single-stage single-phase bidirectional buck-boost inverter includes a single-phase inverter bridge, a filter inductor L, a switch unit, and a filter capacitor C.

[0046] The single-phase inverter bridge includes two bridge arms, the first bridge arm includes the fifth and sixth switching tubes Q 5 , Q 6 , the second bridge arm includes the seventh and eighth switching tubes Q 7 , Q 8 . Fifth switching tube Q 5 Cathode and sixth switching tube Q 6 The anode connection of the seventh switching tube Q 7 The cathode and the eighth switch tube Q 8 Anode connection, the fifth switching tube Q 5 Anode and the seventh switching tube Q 7 The connection point of the anode is the positive terminal of the single-phase inverter bridge, and the sixth switching tube Q 6 The cathode and the eighth switch tube Q 8The connection point of the cathode...

specific Embodiment 2

[0053] Specific embodiment 2, a single-stage single-phase bidirectional buck-boost inverter (2).

[0054] Such as Figure 5 The shown single-stage single-phase bidirectional buck-boost inverter includes a single-phase inverter bridge, a filter inductor L, a switch unit, and a filter capacitor C.

[0055] The single-phase inverter bridge is the same as the specific embodiment 1, consisting of fifth, sixth, seventh, and eighth switching tubes Q5, Q6, Q7, and Q8.

[0056] The switch unit includes a first complementary bidirectional power electronic switch and a second complementary bidirectional power electronic switch. The first complementary bidirectional power electronic switch includes a first switching tube Q1 and a second switching tube Q2. The second complementary bidirectional power electronic switch includes a third switch Tube Q3, fourth switching tube Q4;

[0057] One end of the filter inductance L is connected to the midpoint of a bridge arm of the single-phase inve...

specific Embodiment 3

[0060] Specific embodiment 3, a single-stage three-phase bidirectional buck-boost inverter.

[0061] Such as Image 6 The shown single-stage three-phase bidirectional buck-boost inverter includes: three-phase inverter bridge, A-phase filter inductor L a , B-phase filter inductance L b , C-phase filter inductor L c , the first complementary three-phase bidirectional power electronic switch, the second complementary three-phase bidirectional power electronic switch, A-phase filter capacitor C a , B-phase filter capacitor C b , C-phase filter capacitor C c .

[0062] The three-phase inverter bridge includes three bridge arms. The first bridge arm includes the seventh and eighth switching tubes Q7 and Q8, the second bridge arm includes the ninth and tenth switching tubes Q9 and Q10, and the third bridge arm includes the tenth switching tubes. 1. The twelfth switch tubes Q11 and Q12. The cathode of the seventh switching tube Q7 is connected to the anode of the eighth switch...

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Abstract

The invention relates to a single-stage bidirectional buck-boost inverter, which belongs to the technical field of power electronic converters. The input end of the single-stage bidirectional buck-boost inverter is connected with a direct-current voltage source, and the output end of the single-stage bidirectional buck-boost inverter is connected with an alternating-current load. The single-stage bidirectional buck-boost inverter comprises an inverter bridge, an input filter unit, a switching unit and an output filter unit which are sequentially connected. The switching unit comprises a first complementary bidirectional power electronic switch and a second complementary bidirectional power electronic switch. In the buck mode, the second complementary bidirectional power electronic switch is normally switched on, the circuit is equivalent to the conventional buck inverter, and bucked output is carried out; in the boost mode, the first complementary bidirectional power electronic switch and the second complementary bidirectional power electronic switch are complementarily switched on, and boosted output is carried out. The single-stage bidirectional buck-boost inverter disclosed by the invention can carry out boosted output and bucked output without a boost conversion circuit, and also realizes bidirectional energy transmission.

Description

technical field [0001] The invention relates to a single-stage bidirectional buck-boost inverter and belongs to the technical field of power electronic converters. Background technique [0002] Inverters are widely used in motor drives, uninterruptible power supplies, induction heating, static var generators and compensators, and active filtering. Traditional inverter circuit topologies include voltage source inverters and current source inverters. [0003] The output AC voltage of the voltage source inverter is lower than the DC bus voltage, so the voltage source inverter is essentially a step-down inverter. In order to realize the function of step-up conversion, an additional step-up conversion circuit needs to be added. The overall structure of the converter is complicated. [0004] The current source inverter is essentially a step-up inverter. In order to realize the function of step-down conversion, an additional level of step-down conversion circuit needs to be added...

Claims

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Application Information

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IPC IPC(8): H02M7/797
Inventor 汤雨
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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