Optimization method based on traditional phase difference measurement and circuit

An optimization method and phase difference technology, applied in the field of signal processing, can solve problems such as low efficiency, interference of harmonics and spectral leakage, and complex processing

Inactive Publication Date: 2012-05-09
SHANGHAI HUAJIAN ELECTRICAL EQUIP
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  • Abstract
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  • Claims
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Problems solved by technology

When the software method is used, the hardware is easy to implement, but the software processing is more complicated, and more complex algorithms need to be introduced. Although the measurement accuracy is...

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  • Optimization method based on traditional phase difference measurement and circuit
  • Optimization method based on traditional phase difference measurement and circuit

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Embodiment Construction

[0006] The present invention will be further described below in conjunction with accompanying drawing:

[0007] See attached figure 1 , the circuit connection relationship is: the signal acquisition circuit, the two measured signals U1 and U2 are respectively connected to the transformer through the current limiting resistors R10 and R20, and the induced voltage signal is a sine wave signal output by the protection circuit; the signal at this time is Very weak, it needs to be amplified by the amplifying circuit. In the amplifying circuit, the amplitude of the signal needs to be adjusted through the potentiometer R2 / R12, and a follower is added to reduce the external interference to the signal; after the amplifying circuit, the signal is boosted and input to the non-inverting comparator To obtain the required rectangular wave signal, the above process is used as a rectangular wave generating circuit, and the two-way rectangular wave passes through the OR gate to obtain a rectan...

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Abstract

The invention, which belongs to the signal processing technology field, discloses an optimization method based on traditional phase difference measurement and a circuit. According to the method, two sinusoidal signals with different frequencies or a same frequencies pass through a signal collection circuit, an amplification circuit, and a comparison circuit as well as two paths of rectangular wave signals pass through an OR gate circuit so as to obtain a needed pulse signal; AD sampling is carried out so as to obtain a pulse width and a time difference of signal zero crossing, so that a phase difference is calculated. According to the invention, because a special circuit design is employed, phase drift generated by hardwares of a traditional zero cross detection circuit itself can be substantially changed, so that correlated subsequent processing of the phase difference on software becomes easier; therefore, the strong practicality is realized.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to an optimization method and circuit based on traditional phase difference measurement. Background technique [0002] The phase difference measurement of periodic signals is involved in industrial control, smart grid, communication, electrotechnical technology and other fields, and has a wide range of applications. At present, most of the applications are the same frequency periodic signal measurement. In order to obtain high-precision measurement results, it is often necessary to build complex hardware circuits and software program processing. Due to factors such as external interference or spectrum leakage, good results may not be obtained. [0003] The measurement method of phase difference can be divided into hardware and software. The hardware is mainly to realize the phase time difference of two signals through the hardware circuit, and then there is software to sa...

Claims

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Application Information

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IPC IPC(8): G01R25/00
Inventor 王晓辉孙旭熹张峰王琦
Owner SHANGHAI HUAJIAN ELECTRICAL EQUIP
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