A three-level and five-level hybrid modulation method for single-phase inverters

A single-phase inverter and modulation method technology, applied in electrical components, AC power input into DC power output, output power conversion devices, etc. Transformers cannot achieve wide voltage and wide frequency signal output, etc., to achieve the effect of small size, wide range and reduction of common mode voltage

Active Publication Date: 2022-06-24
连云港杰瑞电子有限公司
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Problems solved by technology

Due to the limitation of the working frequency band of the transformer core, the transformer with fixed parameters cannot realize the output of wide voltage and wide frequency signals, especially the low frequency signal transformer is large in size and cannot meet the installation space requirements of small instruments and equipment

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  • A three-level and five-level hybrid modulation method for single-phase inverters
  • A three-level and five-level hybrid modulation method for single-phase inverters
  • A three-level and five-level hybrid modulation method for single-phase inverters

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Embodiment Construction

[0025] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the present invention. examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] refer to figure 1 , a three-level and five-level hybrid modulation method for a single-phase inverter, a single-phase T-type inverter with midpoint clamping, consisting of a DC power supply (Udc), field effect transistors (SHa, SHb, SZa , SZb, SLa1, SLa2, SLb1, SLb2), inductors (La, Lb), capacitors, and resistors; in order to reduce the common-mode voltage, connect the midpoint ...

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Abstract

A three-level and five-level hybrid modulation method for a single-phase inverter, the method uses an inverter circuit including a DC power supply, a field effect transistor, an inductor, a capacitor, and a resistor, and the inverter circuit is used to reduce the common-mode voltage , connect the midpoint of the AC side to the midpoint N of the DC side; this method mixes the three-level and five-level modulation methods, and uses the three-level modulation method when the modulation ratio is higher than 0.2, and uses the three-level modulation method when the modulation ratio is lower than 0.2 When using the five-level modulation method, it has the following significant advantages: the output voltage range is 2~115V; the output frequency range is 47~10000Hz; through the mixed use of three-level modulation and five-level modulation methods, the THD can reach the requirement of less than 2%. ; Circuit structure is compact, small size; high output power, up to 6VA.

Description

technical field [0001] The invention relates to the technical field of single-phase inverter power supplies, in particular to a three-level and five-level hybrid modulation method for a single-phase inverter. Background technique [0002] Voltage and frequency adjustable Voltage and frequency adjustable single-phase T-type inverter is a low-power sine wave signal source, mainly used in self-aligning machines, resolvers, LVDT sensors, RVDT sensors and other sensor testing equipment. Provides a low-power sine wave reference signal source for testing. This type of inverter power supply is used to provide sine wave signals of different voltages and frequencies required in the sensor testing process, and the signal power requirement generally does not exceed 6VA. [0003] Self-aligning machine and resolver are shaft angle measurement sensors. The voltage range of the excitation power supply is 2~115V, the voltage accuracy is ±5%, and the frequency range is 47~10000Hz; LVDT senso...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M1/12
CPCH02M7/483H02M1/12
Inventor 寇志强李澍路峻豪司琦柳明燚王瑞颜玲龙王磊韦厚余邵靖凯
Owner 连云港杰瑞电子有限公司
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