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Method and device for converting direct current into alternating current

An alternating current and direct current technology, which is applied in the direction of converting irreversible direct current power input into alternating current power output, output power conversion devices, electrical components, etc. Short time and other problems, to achieve the effects of high output voltage accuracy, reduced volume and weight, and long continuous working time

Inactive Publication Date: 2012-04-11
LINQUAN AEROSPACE MOTOR CO LTD
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Problems solved by technology

However, due to the shortcomings of rotary converters such as large size, heavy weight, high cost, low efficiency, low output voltage accuracy, slow voltage recovery when the load changes suddenly, and short continuous working time, it is increasingly unable to meet the needs of modern aircraft and electrical equipment. need

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  • Method and device for converting direct current into alternating current
  • Method and device for converting direct current into alternating current
  • Method and device for converting direct current into alternating current

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Embodiment Construction

[0023] The following describes the present invention in further detail with reference to the accompanying drawings and embodiments, but it is not used as a basis for any limitation of the present invention.

[0024] Examples. The invention is like figure 1 Shown. A method of converting direct current to alternating current. This method is to convert the direct current power into a set of quasi-square waves with a difference of π / 6n between each other through a 3n (n is a natural number) phase splitting circuit. After the power is amplified by a power amplifier circuit, The primary side of the transformer superimposes 6n groups of quasi-square waves according to the law of sine amplitude into a step wave similar to the sine wave to cancel out the higher harmonics; after filtering on the secondary side of the transformer, a pure AC power source is obtained. The phase splitting circuit uses a crystal oscillator as an oscillation source to form an RC clock circuit. The crystal osc...

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Abstract

The invention discloses a method and a device for converting direct current into alternating current. In the method, a direct-current power supply is converted by 3n (n is a natural number) phase-splitting circuits into a group of quasi square waves among which a phase difference is Pi / 6n; after power is amplified by a power amplification circuit, the 6n groups of quasi square waves are stacked into stair waves similar to sine waves on the primary side of a transformer according to a sine amplitude rule, so higher harmonics in the quasi square waves can be counteracted; and pure 3n alternating-current power supplies can be acquired by filter processing on the secondary side of the transformer. The device comprises a clock circuit (1), a phase-splitting circuit (2), the power amplification circuit (3), the transformer (4) and a filter circuit (5) which are connected with one another, wherein a booster circuit (6) is arranged at a joint between the phase-splitting circuit (2) and the power amplification circuit (3). The invention has the advantage of retaining the conventional airplane power supply system; furthermore, the volume and the weight of the airplane power supply system are reduced, the cost is reduced and the efficiency is improved, so requirements of modern airplanes and electric equipment can be met.

Description

technical field [0001] The invention relates to a method and a device for converting direct current into alternating current, belonging to the secondary power supply technology, in particular to a method and a device for converting a 27V direct current main power supply on an aircraft into a single-phase or multi-phase alternating current power supply. Background technique [0002] In the aviation power supply system, it is necessary to convert the 27V DC main power supply on the aircraft into 115V or 36V, 1KHZ single-phase or three-phase AC power supply for some electrical equipment on the aircraft. At present, the rotary converter used in the aviation power supply system used on the aircraft has the characteristics of stable output frequency, simple circuit structure, small output waveform distortion, and little interference to other electrical equipment. However, due to the shortcomings of rotary converters such as large size, heavy weight, high cost, low efficiency, low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/44H02M1/12
Inventor 郑和俊穗贵良汤君凤
Owner LINQUAN AEROSPACE MOTOR CO LTD
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