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A three-level inverter and its driving zero-crossing switching control method

A technology of a three-level inverter and a control method, which is applied in the direction of converting AC power input into DC power output, electrical components, and output power conversion devices, and can solve the problem of destroying PWM dead zones, complex methods, and dead zone failures, etc. problem, to achieve the effect of low zero-crossing distortion, simple structure and high reliability

Active Publication Date: 2020-06-09
SHENZHEN KSTAR SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The essential reason is that the dead zone is first generated by DSP / ARM / MCU, and the PWM (PulseWidth Modulation, Pulse Width Modulation) drive including the dead zone is then used by CPLD (Complex Programmable Logic Device, complex programmable logic device) / FPGA (Field- Programmable Gate Array (Field Programmable Gate Array) adjusts the drive for the zero crossing point. When adjusting, due to the vicinity of the zero crossing point, the inner tube will change from the switch state to the forced conduction state, destroying the original PWM dead zone, resulting in the dead zone being invalid. It is necessary to add a dead zone generating unit, and the method is very complicated

Method used

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  • A three-level inverter and its driving zero-crossing switching control method
  • A three-level inverter and its driving zero-crossing switching control method
  • A three-level inverter and its driving zero-crossing switching control method

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Experimental program
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Effect test

Embodiment 1

[0042] Common three-level topologies include I-type three-level and T-type three-level. The present invention uses I-type as an example to describe, and it is also applicable to T-type. The switching device takes IGBT as an example, which is also applicable to MOSFET. I-type The half-bridge topology and the circuit diagram of switching devices are shown in figure 1 shown. The three-level inverter includes a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, and a fourth switching tube Q4, and the driving zero-crossing switching control method of the three-level inverter includes: The following steps:

[0043] Step 101: DSP / ARM / MCU generates and sends the external tube PWM driving signal without dead zone, and generates and sends the positive and negative half-cycle switching signals. The schematic diagram of the external tube PWM driving and positive and negative half-cycle switching signals is as follows figure 2 shown;

[0044] Step 201: The ...

Embodiment 2

[0053] A driving zero-crossing switching control system of a three-level inverter adopts the driving zero-crossing switching control method of the three-level inverter described in Embodiment 1, and it is connected with the first switching tube Q1 and the second switching tube Q1 respectively. Q2, the third switching tube Q3 and the fourth switching tube Q4 are connected, and the system includes:

[0054] The first generation module is used to generate the external tube PWM drive signal without dead zone and the positive and negative half cycle switching signal;

[0055] The first sending module is used to send the external tube PWM drive signal without dead zone and the positive and negative half cycle switching signal;

[0056] The second generation module is used to generate the first PWM driving signal without dead zone, the second PWM driving signal, the third PWM driving signal and the fourth PWM driving signal;

[0057] The third generation module is used to generate t...

Embodiment 3

[0060] A three-level inverter, the circuit diagram is as follows figure 1 As shown, it includes the first switching tube Q1, the second switching tube Q2, the third switching tube Q3 and the fourth switching tube Q4, and the driving zero-crossing switching control system of the three-level inverter. The three-level inverter The driving zero-crossing switching control system of the inverter adopts the driving zero-crossing switching control method of the three-level inverter described in Embodiment 1.

[0061] The three-level inverter is applied in a modular UPS product. Compared with the conventional solution, the test shows that the output voltage THDu is reduced by 0.2%; it is more stable and reliable.

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Abstract

The invention provides a three-level inverter and a driving zero-crossing switching control method of the same. The driving zero-crossing switching control method of the three-level inverter includes the following steps: generating and sending an outer tube PWM (Pulse Width Modulation) driving signal without a dead zone, and generating and sending a positive and negative half cycle switching signal; receiving the outer tube PWM driving signal and the positive and negative half cycle switching signal, and generating a first driving signal, a second driving signal, a third driving signal and a fourth driving signal without dead zones; when the outer tube PWM driving signal is negative half cycle or positive half cycle, driving to generate a driving signal of a first switch tube with a dead zone, a driving signal of a second switch tube with a dead zone, a driving signal of a third switch tube with a dead zone, and a driving signal of a fourth switch tube with a dead zone corresponding to the first driving signal, the second driving signal, the third driving signal and the fourth driving signal; and outputting. The technical scheme of the driving zero-crossing switching control method of the same has the advantages of being simple in structure, being high in reliability and being low in zero crossing distortion.

Description

technical field [0001] The invention belongs to the technical field of electronic circuit design, and in particular relates to a three-level inverter and a driving zero-crossing switching control method thereof. Background technique [0002] There are more and more three-level applications in the field of inverters. When distributing the drive of the four switching devices of the three-level, there are usually two distribution methods: one is to use DSP / ARM / MCU to send two external The drive of the tube, and then use CPLD / FPGA to generate 4 drives; the other is to use DSP / ARM / MCU to send the drive of the two switching devices that are in the switching state in this half cycle, and then use CPLD / FPGA to generate 4 drives drive. [0003] When the three-level topology is used in the AC field, when working in the positive half cycle, the outer tube connected to the positive busbar and the two inner tubes are usually connected to work, and the outer tube connected to the negativ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387H02M1/088
CPCH02M7/483H02M7/5387
Inventor 万学维曾耀聂辉邹聪颖熊勇
Owner SHENZHEN KSTAR SCI & TECH