Synchronous demodulator, power standard source comprising synchronous demodulator and control method of power standard source

A technology of synchronous demodulator and control method, which is applied in the direction of instruments, measuring devices, and measuring electric variables, etc., which can solve the problems of slow system response, long sampling time, and large calculation amount, and achieve fast system response, short sampling time, The effect of small amount of calculation

Active Publication Date: 2014-12-17
HUNAN YINHE ATITAN TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two calculation methods for traditional power sources: (1) effective value method, which uses effective value to measure the output and then feeds back to the controller. (2) Discrete Fourier (DFT) transform method, this method can calculate the amplitude, frequency and phase of each harmonic in frequency conversion electric energy metering, but the sampling time is long, the calculation amount is large, and the system The response is slow, and the amplitude and phase are also affected by the accuracy of the frequency point

Method used

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  • Synchronous demodulator, power standard source comprising synchronous demodulator and control method of power standard source
  • Synchronous demodulator, power standard source comprising synchronous demodulator and control method of power standard source
  • Synchronous demodulator, power standard source comprising synchronous demodulator and control method of power standard source

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Embodiment 1

[0067] A synchronous demodulator, see figure 1 , specifically including a cosine generator 71 , a sine generator 72 , a first memory 73 , an MCU 74 , a second memory 75 and a third memory 76 .

[0068] The cosine generator 71 and the sine generator 72 are arranged in parallel, and the output ends of both are connected to the input end of the first memory 73 .

[0069] The output end of the first memory 73 is connected with the first input end of the MCU 74 .

[0070] The second input end of the MCU 74 is connected to the output end of the third memory 76 .

[0071] The output terminal of the MCU 74 is connected with the input terminal of the second memory 75 .

[0072] The MCU74 is provided with a digital signal processor DSP.

[0073] The control method of the above-mentioned synchronous demodulator includes the following steps:

[0074] The first step: the cosine generator 71 and the sine generator 72 generate two signal matrices X according to the set operating frequenc...

Embodiment 2

[0093] A power standard source, see figure 2 .

[0094]It specifically includes input panel 1 for setting amplitude, frequency and phase, controller 2, power amplifier 3, load 4, current probe or voltage probe 5, A / D converter 6 and synchronous demodulator 7, the overall structure streamline.

[0095] The controller 2 includes a PID regulator 21 and a DDS controller 22, and the synchronous demodulator 7 includes a cosine generator 71, a sine generator 72, a first memory 73, an MCU 74, a second memory 75 and a third A memory 76 , the cosine generator 71 and the sine generator 72 are arranged in parallel, and the output ends of both are connected to the input end of the first memory 73 .

[0096] The output end of the first memory 73 is connected to the first input of the MCU74, the second input of the MCU74 is connected to the output of the third memory 76, and the output of the MCU74 is connected to the output of the MCU74. The input end of the second memory 75 is connecte...

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Abstract

The invention provides a synchronous demodulator concise in structure. The synchronous demodulator comprises a cosine generator, a sine generator, a first memory device, a MCU (microprogrammed control unit), a second memory device and a third memory device; the cosine generator and the sine generator are parallelly arranged, and the output end of the cosine generator and the output end of the sine generator are connected with the input end of the first memory device; the output end of the first memory device is connected with the first input end of the MCU; the second input end of the MCU is connected with the output end of the third memory device; the output end of the MCU is connected with the input end of the second memory device; a digital signal processor (DSP) is arranged in the MCU. The second objective of the invention is to provide a demodulating method of the synchronous demodulator, so that accuracy in demodulating can be realized. The third objective of the invention is to provide a power standard source and a control method thereof. By the application of the power standard source and the control method thereof, the control method is simple, sampling time is short, calculation is small in amount and system response is fast.

Description

technical field [0001] The invention relates to the field of calibration equipment for variable frequency variables, in particular to a synchronous modulator, a power standard source containing the synchronous modulator and a control method thereof. Background technique [0002] As the power supply of the frequency conversion speed regulation system, the frequency converter is widely used. How to accurately measure the loss and efficiency of the frequency converter and the loss and efficiency of the frequency conversion motor is a major issue to be solved urgently in the technology of frequency conversion speed regulation. [0003] The measurement of electric energy is a major event directly related to the national economy and the people's livelihood, and the accuracy of its measurement level directly reflects the level of a country's industry. The measurement of electric energy mainly includes the measurement of voltage, current amplitude, frequency, phase angle of voltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/00
Inventor 王宁
Owner HUNAN YINHE ATITAN TECH CO LTD
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