Broadband high-precision digital power meter and rapid optimization sampling method

Abstract

The invention relates to a broadband high-precision digital power meter and a rapid optimization sampling method, the broadband high-precision digital power meter comprises a power supply module, anda sampling storage control module, an operation storage control module, a main control module, a display module and an interface module which are electrically connected with the power supply module, the sampling storage control module is electrically connected with the operation storage control module; the operation storage control module is electrically connected with the main control module, andthe main control module is electrically connected with the display module and the interface module. According to the broadband high-precision digital power meter and the rapid optimization sampling method, the defects in the background technology are overcome, accurate control over the sampling position in each period is achieved through the method, the quality of each characteristic sampling point is improved, the sampling period is shortened, and the sampling speed and precision are improved; meanwhile, use of expensive chips is reduced, and the product cost is reduced, and more customers with low-cost product requirements can be met.

Description

Technical field: [0001] The invention relates to the fields of instrumentation and electronic measurement, in particular to a broadband high-precision digital power meter and a fast optimization sampling method for the broadband high-precision digital power meter. 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 and other related issues directly affect related products. The performance of these systems requires special measuring instruments to detect the energy consumption of these systems. Therefore, there is an increased demand for home appliance manufacturers to use digital power meters to test power supply products and home appliances; the speed requirements for digital power meters to detect products also further improve...

AI Technical Summary

Problems solved by technology

[0003] With the continuous popularization and application of new energy products and switching power supply products, the demand for power analysis of such equipment with high-frequency component signals and high-frequency harmonic analysis functions for some special waveform drive devices is also increasing; traditional, Due to the limitation of the measurement bandwidth, the conventional power meter is generally in the power frequency or the bandwidth range of hundreds of Hz, which cannot meet the power analysis requirements of such high-frequency signals. To achieve high-precision analysis of the measured signal, it is necessary to obtain more eigenvalues ​​within a single cycle of the measured signal. At present, the measurement and sampling techniques of broadband high-precision power analyzers can be roughly divided into two types: one is to use a high-speed The ADC (up to a few megabytes) is used for high-speed sampling of the measured signal, and more characteristic values ​​of the measured signal can be obtained in a single cycle to achieve high-precision analysis of the measured signal; the second is to use an ordinary ADC (normally 100K Left and right), using a dynamic random sampling scheme to realize the sampling analysis of the measured signal (dynamic random sampling is to dynamically adjust the sampling frequency of the ADC, in each cycle of the measured signal, the sampling frequency is different, then the relative frequency of the measured signal The positions of the sampling points are different, and the acquisition of more eigenvalues ​​in a single cycle of the measured signal is achieved through multiple cycle sampling)

[0004] The above two sampling schemes of broadband high-precision power meters have their own advantages and disadvantages. The first scheme can realize fast sampling and high-precision analysis, but due to the high cost of components, it belongs to high-end power meters. Cost customer needs; the second option, dynamic random sampling, because the sampling position in each cycle cannot be accurately controlled, therefore, multiple sampling of the periodic signal is required to achieve more feature values ​​in a single cycle, which is required for testing longer time

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