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Three-level and five-level hybrid modulation method for single-phase inverter

A single-phase inverter and modulation method technology, applied in electrical components, conversion devices for converting AC power input to DC power output, and output power, etc. Voltage and wide frequency signal output, large transformer volume and other problems, to achieve the effect of small size, compact circuit structure and high output power

Active Publication Date: 2021-03-19
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

Method used

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  • Three-level and five-level hybrid modulation method for single-phase inverter
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  • Three-level and five-level hybrid modulation method for single-phase inverter

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Embodiment Construction

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to 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 a midpoint clamp, 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 volta...

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Abstract

The invention discloses a three-level and five-level hybrid modulation method for a single-phase inverter, and the method comprises the steps: employing an inverter circuit which comprises a DC powersupply, a field effect transistor, an inductor, a capacitor and a resistor, and enabling an AC side midpoint to be connected with a DC side midpoint N through the inverter circuit in order to reduce acommon-mode voltage; and according to the method, a three-level modulation method and a five-level modulation method are used in a mixed mode, the three-level modulation method is used when the modulation ratio is higher than 0.2, the five-level modulation method is used when the modulation ratio is lower than 0.2, and the method has the following remarkable advantages that the output voltage range is 2-115 V, the output frequency range is 47-10000 Hz; THD can meet the requirement that THD is smaller than 2% through mixed use of the three-level modulation and five-level modulation methods; the circuit is compact in structure and small in size; and the output power is high and can reach 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 single-phase inverters. 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 sensor testing equipment such as auto-alignment machine, resolver, LVDT sensor, RVDT sensor, etc. Provide 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 during sensor testing, and the signal power requirements generally do not exceed 6VA. [0003] Autosynchronous machines and resolvers belong to shaft angle measurement sensors, the voltage range of their excitation power supply is 2~115V, the voltage accuracy is ±5%, and the frequency range is 47~10000Hz; LVDT sens...

Claims

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Application Information

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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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