High-precision equal sampling system and method for harmonic measurement of digital power meter

Abstract

The invention relates to a high-precision equal sampling system and method for harmonic measurement of a digital power meter, the high-precision equal sampling system comprises a power supply module, an operation processing module, a measurement control module and a plurality of sampling modules, the operation processing module, the measurement control module and the sampling modules are respectively connected with the power supply module, and the measurement control module is connected with the sampling modules. And the operation processing module is connected with the measurement control module. According to the high-precision equal sampling system and method for harmonic measurement of the digital power meter, the input signal is subjected to precise frequency multiplication output through the method, the sampling position in each period is precisely controlled, the quality of each characteristic sampling point is improved, the sampling period is shortened, the sampling speed and precision are improved, and the sampling efficiency is improved. Therefore, the harmonic measurement analysis requirement of the input signal is met.

Description

Technical field: [0001] The invention relates to the technical field of electronic measurement, in particular to a high-precision equal sampling system for harmonic measurement of a digital power meter and a high-precision equal sampling system and method using the system. Background technique: [0002] With the rapid development of the modern power electronics industry, there are more and more power supply and load products. Most power electronic systems are inseparable from power supply and load. Due to the conversion efficiency of power supply, load power consumption, harmonic components and other related issues It directly affects the performance of related products, which requires the use of special measuring instruments to detect the use of these systems. Therefore, there is an increasing demand for home appliance manufacturers to use digital power meters to test power supply products and home appliances; for digital power meters to test products Speed ​​requirements a...

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Problems solved by technology

[0004] The above two power meter harmonic sampling schemes have their own advantages and disadvantages. The first scheme can achieve fast and accurate sampling and high-precision analysis, but because the hardware phase-locked loop can generally only achieve multiplication phase-locking for signals in a relatively narrow frequency range, Signals with more than a wider frequency range lose the phase-locking effect, and the harmonic analysis function cannot be realized; the second solution, software calculation sampling control, compared with the first solution, has lower restrictions on signal frequency and can achieve a wider frequency range Harmonic analysis of the signal, but due to the limitation of the CPU running clock, the sampling points in a single cycle cannot be accurately distributed equally. Therefore, in the process of multi-cycle sampling, there are unequal distributions of sampling points in the cycle for some frequency signals , The problem of large phase shift during each sampling cycle, resulting in large error and low consistency of harmonic analysis values

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