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Quadrature phase-locked amplifier phase compensation method and device based on time division multiplexing

A quadrature phase-locking and phase compensation technology, applied in the automatic control of power, electrical components, etc., can solve the problems of inaccurate phase detection, high harmonic content, detection phase offset, etc., and achieve the goal of improving the accuracy of phase detection Effect

Pending Publication Date: 2021-02-09
XJ POWER CO LTD +2
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Problems solved by technology

[0003] The switch-type phase-sensitive detection circuit can detect the phase of the signal of a specific sub-frequency. If the harmonic content of the detected signal is high, the detection phase will be shifted and the phase detection will be inaccurate.

Method used

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  • Quadrature phase-locked amplifier phase compensation method and device based on time division multiplexing
  • Quadrature phase-locked amplifier phase compensation method and device based on time division multiplexing
  • Quadrature phase-locked amplifier phase compensation method and device based on time division multiplexing

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0037] figure 1 It is a schematic diagram of a phase compensation circuit provided by an embodiment of the present invention.

[0038] figure 2 It is a schematic diagram of the quadrature multiplication of the P-axis reference signal and the sinusoidal signal provided by the embodiment of the present invention.

[0039] image 3 It is a schematic diagram of quadrature multiplication of a Q-axis reference signal and a...

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Abstract

The invention discloses a quadrature phase-locked amplifier phase compensation method and device based on time division multiplexing, and the method comprises the steps: carrying out phase compensation of a specific subharmonic signal outputted by a quadrature phase-locked amplifier by a DSP processing module; alternately outputting square wave orthogonal signals of fundamental wave and specific harmonic frequency to an orthogonal lock-in amplifier in a time-sharing manner through a DSP processing module; carrying out quadrature multiplication on the actual signal and the square wave quadrature signal by a quadrature lock-in amplifier, and outputting a PQ direct current component; and inputting the PQ direct-current component into a DSP processing module and superposing the PQ direct-current component so as to eliminate the interference of a specific-order harmonic signal on a fundamental wave. Through time division multiplexing of one path of orthogonal phase-locked circuit, on the basis of not increasing a hardware circuit, a component for detecting higher harmonics is extracted to compensate a phase, so that the problem of inaccurate phase detection when the harmonic content ofa detection signal is very high is solved, and the phase detection precision is improved.

Description

technical field [0001] The invention relates to the technical field of power equipment control, in particular to a phase compensation method and device for an quadrature lock-in amplifier based on time-division multiplexing. Background technique [0002] Quadrature lock-in amplifier: A lock-in amplifier is an electronic instrument used to measure dynamic signals. Its function is to measure the phase and amplitude of a signal at a certain frequency from a signal submerged in noise. Using the cross-correlation characteristics of the reference signal and the measured signal, the measured signal with the same frequency and phase as the reference signal is extracted. [0003] The switch-type phase-sensitive detection circuit can detect the phase of the signal of a specific sub-frequency. If the harmonic content of the detected signal is high, the detection phase will be shifted and the phase detection will be inaccurate. Contents of the invention [0004] The purpose of the em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/093H03L7/081
CPCH03L7/093H03L7/081
Inventor 刘超甘江华陈天锦刘向立曹智慧刘天强刘振威张雨来曹亚马瑞孙亮张臻牛高远高昂张晓丽田丽敏蔡思琪秦力高鹏吕海超
Owner XJ POWER CO LTD
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