Frequency sampling circuit, and apparatus, converter, system, method, medium and program

By using isolated sampling and differential amplification circuits to process grid signals, the problem of inaccurate grid frequency detection in photovoltaic converters is solved, improving the accuracy of frequency detection and system stability.

WO2026103344A1PCT designated stage Publication Date: 2026-05-21NAT ENERGY INTERNET INNOVATION CENT (GUANGDONG) CO LTD +1
View PDF 11 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NAT ENERGY INTERNET INNOVATION CENT (GUANGDONG) CO LTD
Filing Date
2025-09-22
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

In photovoltaic converters, inaccurate grid frequency detection leads to inaccurate IGBT transistor control, resulting in harmonics and efficiency issues. Furthermore, when surplus photovoltaic power is connected to the grid, excessively high or low frequencies can cause grid disconnection problems.

Method used

An isolation sampling circuit is used to convert the strong electrical signal from the power grid into a weak electrical signal. The signal is then differentially amplified by an operational amplifier circuit and frequency is detected by a comparator circuit, thereby reducing the interference of the strong electrical signal on the detection process.

Benefits of technology

It improves the accuracy of grid frequency detection, reduces the interference of strong electrical signals on weak electrical signals, and enhances the operational stability of photovoltaic converters in centrifuge systems and photovoltaic power generation systems.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN2025122996_21052026_PF_FP_ABST
    Figure CN2025122996_21052026_PF_FP_ABST
Patent Text Reader

Abstract

A frequency sampling circuit, and an apparatus, a converter, a system, a method, a medium and a program. The frequency sampling circuit comprises: an isolation sampling circuit (110), which is configured to receive a first voltage signal (V1) from a power grid, and output a second voltage signal (V2) in response to the first voltage signal (V1), wherein a voltage value of the second voltage signal (V2) is less than a voltage value of the first voltage signal (V1), and the second voltage signal (V2) comprises a first sub-voltage signal (V21) and a second sub-voltage signal (V22); an operational amplifier circuit (120), which is configured to receive the first sub-voltage signal (V21 and the second sub-voltage signal (V22), and perform differential amplification processing on the first sub-voltage signal (V21) and the second sub-voltage signal (V22) so as to output a third voltage signal (V3); and a comparison circuit (130), which is configured to receive the third voltage signal (V3), and compare the third voltage signal (V3) with a reference voltage signal (Vref) so as to output a comparison result (V4).
Need to check novelty before this filing date? Find Prior Art