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Three-phase single-stage inverter

An inverter, single-stage technology, used in instruments, regulating electrical variables, converting DC power input to DC power output, etc., can solve the problems of cumbersome control methods, increase economic costs, increase volume, etc., and achieve stable topology. The effect of improving efficiency and high output power

Active Publication Date: 2018-06-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Greatly increase the overall volume, improve the economic cost
The sum of the output power in the three-phase inverter system is close to a constant value, but three single-phase single-stage inverters directly form a three-phase system with a complex structure and cumbersome control methods

Method used

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  • Three-phase single-stage inverter
  • Three-phase single-stage inverter
  • Three-phase single-stage inverter

Examples

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Embodiment Construction

[0009] Such as figure 1 As shown, this example is a three-phase single-stage inverter, which is characterized in that: the first switching tube S 5 One end of the first diode D 3 The cathode and the external DC power supply U i The positive connection of the second switch tube S 6 One end of the second diode D 4 The anode of the connected external DC power supply U i The negative connection of the third switching tube S 1A , the third diode D 1A The cathode and the first inductance L 1 One end of the connection; the first inductance L 1 One end of the fourth diode D 2A The anode of the fourth switching tube S 2A One end of the connection; the fifth switching tube S 3A , the fifth diode D 3A The anode and the first inductor L 1 One end of the connection; the first inductance L 1 One end of the sixth diode D 4A The cathode and the sixth switching tube S 4A One end of the connection; the fourth switching tube S 2A One end of the first winding connected to the othe...

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Abstract

A three-phase single-stage inverter includes a circuit 1, a circuit 2 and a circuit 3. Making full use of the advantages of the circuit 2 isolation transformer solves the problems of large step-up ratio and electrical isolation. The inverter is a single-input power supply, which overcomes the shortcoming that the traditional output parallel combined single-stage inverter needs dual-input power supply. The control strategy adopts the dual modulation of the primary and secondary sides, the secondary side modulates the inverter output, the primary side controls the input current to a constant value, and there is no low-frequency pulse. In addition, the three-phase single-stage inverter retains the characteristics of an output parallel single-stage inverter, and less current flows through devices during operation, which improves efficiency. The circuit topology is stable, reliable and has a large output power.

Description

1. Technical field [0001] The invention relates to a three-phase single-stage inverter, which belongs to the inverter in an electric energy conversion device. 2. Background technology [0002] As time goes by, non-renewable energy sources such as coal and oil will run out one day. As a renewable energy source, solar energy will gradually replace fossil energy as the energy supply for human society. Traditional single-phase single-stage inverters have power pulse problems. Therefore, the DC side of traditional single-phase inverters needs to be connected in parallel with an electrolytic capacitor with large capacitance and volume. The overall volume is greatly increased, and the economic cost is improved. The sum of the output power in the three-phase inverter system is close to a constant value, but the direct composition of three single-phase single-stage inverters into a three-phase system has a complex structure and cumbersome control methods. 3. Contents of the inven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M3/335
CPCH02M3/335H02M7/5387H02M1/007
Inventor 嵇保健孙柯洪峰虞超群
Owner NANJING TECH UNIV
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