Industrial frequency-harmonic interference resistant signal sampling method and system

A signal sampling and harmonic interference technology, applied in the field of signal sampling methods and systems against power frequency and its harmonic interference, can solve the problem of not being able to take into account the performance of signal fidelity, cost, resource occupation, calculation time, real-time tracking, etc. and other problems, to achieve the effect of eliminating power frequency interference and achieving simple

Active Publication Date: 2010-03-10
SHENZHEN GOODIX TECH CO LTD
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Problems solved by technology

[0010] The purpose of the embodiments of the present invention is to provide a signal sampling method and system that are resistant to power frequency and its harmonic interference, aiming to improve the problems existing in the prior art that cannot simultaneously take into account signal fidelity, cost, resource occupation, time-consuming calculation and Defects in performance such as real-time tracking

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  • Industrial frequency-harmonic interference resistant signal sampling method and system
  • Industrial frequency-harmonic interference resistant signal sampling method and system
  • Industrial frequency-harmonic interference resistant signal sampling method and system

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Embodiment 1

[0048] Figure 4 It is an embodiment applied to the touch detection system of an induction cooker, which uses the built-in hysteresis comparator function of the single-chip microcomputer to receive the synchronous signal, and the detection sampling is obtained through data acquisition through an AD converter with a multi-way switch.

[0049] Figure 5 A schematic diagram of a preferred 100Hz power frequency synchronous circuit in this application example, which uses the ground wire of the rectifier bridge of the induction cooker to form a loop. The 50Hz AC signal of the mains is rectified by D1 and D2 to obtain a 100Hz full-wave signal. R1 plays the role of shunting and freewheeling. C1 blocks DC and communicates with AC. R2 and C1 form a partial voltage. C1, R1 and R2 cooperate to form a high-pass filter circuit, output C1 is the charging and discharging voltage waveform on C1, C2, R2 and C3 are RC-π filter circuits, which are used to filter out high-frequency clutter, and D...

Embodiment 2

[0053] Figure 8 It is an embodiment applied to the touch detection system of an electric water heater. In this application, the power frequency synchronous signal circuit is directly output to the external interrupt port of the single-chip microcomputer, and the data sampling is controlled through its interrupt function, and the detection sampling is through a multi-channel AD converter (can be simultaneously Convert multiple channels) for data acquisition.

[0054] Figure 9 A schematic diagram of a preferred 50Hz power frequency synchronous circuit in this application example, the ground wire of the circuit is connected to the ground wire of the electric water heater to form a loop. The other end is connected to the L line or N line end of the mains, and a stable digital square wave synchronization signal is obtained after successively passing through the resistance-capacitance step-down module, RC-π filter module, and voltage stabilization protection module.

[0055] F...

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Abstract

The invention is applicable to the technical field of electric variable sampling measurement, and provides an industrial frequency interference resistant signal sampling method and a system. The method comprises the following steps: step A. extracting industrial signals from input commercial power alternating-current signals, synchronously tracking industrial interference signals superposed on detection signals through industrial frequency signals, and generating an industrial frequency synchronous signal; and step B. locking a zero crossing phase of the industrial frequency interference signals according to the industrial frequency synchronous signals, and synchronously sampling the input detection signals at the zero crossing phase. The invention realizes the synchronous sampling of thedetection signals at the zero crossing phase by synchronously tracking the industrial frequency interference signals; and compared with the wave traps or filter technique, the embodiment of the invention can furthest reserve effective components in the detection signals while eliminating the industrial frequency interference, has simple algorithm realization, and little source and time consumption, and can real-time track the industrial frequency interference.

Description

technical field [0001] The invention belongs to the technical field of electrical variable sampling and measurement, and in particular relates to a signal sampling method and system for resisting power frequency and its harmonic interference. Background technique [0002] There are weak signal sampling and detection systems in many industrial measurement and control, medical equipment, and household appliances based on AC power supply of the mains. The detected signal is affected by power frequency noise interference. Therefore, suppressing or eliminating power frequency and its harmonic interference is one of the important technical issues. [0003] At present, there are mainly the following technical methods for suppressing or eliminating power frequency and its harmonic interference: [0004] 1. Set a notch filter with power frequency as the center frequency at the signal sampling end, so as to prevent or attenuate the power frequency component in the measurement signal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/00G01R19/175
Inventor 龙华李亮王营
Owner SHENZHEN GOODIX TECH CO LTD
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