Digital Phase Meter and Its Method for Measuring Phase Difference Between Signals Based on Phase Locked Loop Technology
A technique of technical measurement and phase difference, applied to the phase angle between voltage and current, measuring devices, measuring electrical variables, etc., can solve the problem of instrument accuracy, low degree of digitization and automation, few supporting products, and few product types, etc. question
Active Publication Date: 2015-11-04
北京中科力森科技有限公司
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Problems solved by technology
[0004] In terms of phase / frequency measurement technology, the domestic field of phase measurement started relatively late, with fewer product types and fewer supporting products; product testing functions are single; instrument accuracy, digitization and automation are not high; phase measurement standards are incomplete
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[0054] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.
[0055] Such as figure 1 As shown, the digital phase meter based on the phase-locked loop technology of the embodiment of the present invention to measure the phase difference between signals includes: a first analog low-pass filter, a second analog low-pass filter, an AD converter and a core algorithm operation circuit, in,
[0056] The first analog low-pass filter is connected to the AD converter for converting the reference signal s a = I a cos(ω 0 t+φ a ) is partially filtered to improve the signal-to-noise ratio of the reference signal to obtain a reference analog signal with a high signal-to-noise ratio, which is sent to the AD converter;
[0057] The second analog lo...
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The invention discloses a digital phase meter and a method for measuring a phase difference between signals and based on phase-locked loop technology. The digital phase meter comprises a first analog low-pass filter, a second analog low-pass filter, an analog-to-digital (AD) converter and a core algorithm operational circuit. The first analog low-pass filter is used for filtering a high-frequency noise part of a reference signal, and the second analog low-pass filter is used for filtering a high-frequency noise part of a signal to be tested. The AD converter is used for converting an analog signal into a digital signal. The core algorithm operational circuit measures initial frequency of a reference digital signal to generate an orthogonal signal. The orthogonal signal is subjected to mixing and underclocking with the reference digital signal and a digital signal to be tested to generate a reference direct current signal, and then is subjected to arc tangent operation to obtain a phase difference phi a between the reference signal and a local signal and a phase difference phi b between the signal to be tested and the local signal. The difference between the phi b and the phi a is calculated so as to obtain a phase difference between the signal to be tested and the reference signal. The digital phase meter and the method can be widely used for measuring the phase difference between the signals, and especially for measuring the phase difference in a high-precision mode.
Description
technical field [0001] The invention relates to the fields of signal measurement and digital signal processing, in particular to a digital phase meter for measuring the phase difference between signals based on a phase-locked loop technology and a method thereof. Background technique [0002] The research on phase measurement technology has a long history. The earliest research and application are in the vector analysis of mathematics and the circular motion and vibration of physics, and then in the electric power department, mechanical department, aerospace, geological exploration, seabed resources, etc. It has also been paid attention to and developed accordingly. With the development of electronic technology and computer technology, phase measurement technology has developed rapidly. At present, phase measurement technology has been relatively perfect, measurement methods and theories are relatively mature, and phase measurement instruments have been serialized and commer...
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IPC IPC(8): G01R25/00
Inventor 刘河山靳刚董玉辉李玉琼罗子人
Owner 北京中科力森科技有限公司