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A control method for a sinusoidal AC inverter

A sinusoidal AC and control method technology, applied in the direction of conversion equipment with intermediate conversion to AC, irreversible DC power input conversion to AC power output, etc., can solve the problems of long research and development cycle, high cost and complexity, etc. Achieve the effect of low cost, fast control process and simple sampling circuit

Active Publication Date: 2017-04-12
SHENZHEN MEGMEET ELECTRICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control method is more complicated, the design is difficult, the cost is high, and the development cycle is long.

Method used

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  • A control method for a sinusoidal AC inverter
  • A control method for a sinusoidal AC inverter
  • A control method for a sinusoidal AC inverter

Examples

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Embodiment Construction

[0018] The principle of the control method of the sinusoidal AC inverter in Embodiment 1 of the present invention is as follows: figure 2 As shown, the sinusoidal AC inverter includes a DC power supply, an inverter circuit and a control circuit.

[0019] The control circuit includes a sampling circuit and a microprocessor, and the microprocessor outputs a SPWM wave to drive a switch tube of an inverter circuit, and outputs a sinusoidal AC voltage at an output terminal after filtering.

[0020] The sampling circuit obtains the sampling voltage at the output terminal of the DC power supply. When the sampling voltage is less than or equal to the set voltage, the microprocessor sends out a standard SPWM wave, and the duty cycle of the SPWM wave pulse remains unchanged. When the sampling voltage is greater than the set voltage, the duty cycle of the SPWM wave pulse sent by the microprocessor is equal to the original SPWM wave pulse duty cycle multiplied by a proportional coefficie...

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PUM

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Abstract

The invention discloses a method for controlling a sine alternating-current inverter. The sine alternating-current inverter comprises a direct-current power supply, an inverter circuit and a control circuit, the control circuit comprises a sampling circuit and a microprocessor, the microprocessor outputs SPWM waves to drive the power device of the inverter circuit, and the sampling circuit acquires sampling voltages at the output end of the direct-current power supply. When the sampling voltages are smaller than or equal to a set voltage, the microprocessor sends the set SPWM waves to drive the power device of the inverter circuit. When the sampling voltages are larger than the set voltage, the duty ratio of the pulses of the SPWM wave sent by the microprocessor is equal to an originally set SPWM wave pulse duty ratio multiplying by a proportionality coefficient, and the proportionality coefficient is equal to the set voltage divided by the sampling voltages. Voltage sampling is carried out on a direct current bus side, and the sampling circuit is simple and low in cost. The microprocessor directly sends the standard SPWM waves or the SPWM waves with a pulse width multiplying one coefficient to drive the power device, and the control process is fast and accurate.

Description

[0001] [technical field] [0002] The invention relates to a sinusoidal AC inverter, in particular to a control method for a sinusoidal AC inverter. [0003] [Background technique] [0004] Such as figure 1 As shown, the existing sinusoidal AC inverters are all sampling at the output AC side, and then feed back the sampling signal to the control terminal, so that the port outputs a sinusoidal AC voltage. This control method is relatively complicated, the design is difficult, the cost is high, and the development cycle is long. [0005] [Content of the invention] [0006] The technical problem to be solved by the invention is to provide a control method of a sinusoidal AC inverter with simple circuit and high control quality. [0007] In order to solve the above-mentioned technical problems, the technical solution adopted by the present invention is a control method of a sinusoidal AC inverter. The sinusoidal AC inverter includes a DC power supply, an inverter circuit and a c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M3/28
Inventor 陈建生吴坤陈华源
Owner SHENZHEN MEGMEET ELECTRICAL CO LTD
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