FPGA (Field Programmable Gate Array)-based bonded phase frequency doubling method and device

Abstract

The invention discloses FPGA (Field Programmable Gate Array)-based bonded phase frequency doubling method and device. The frequency doubling device comprises a square wave processor, an adding counter, a linear predicator, a corrector, a divider, a bonded phase multiple storage device, a latch and a subtract counter which are programmed by a VHDL (Visible Hardware Description Language) and are integrated into one FPGA. A bonded phase signal is processed by the square wave processor to become a standard square wave signal; the adding counter is used for counting the period of the square wave signal under the trigger of a clock signal; a counting value is transmitted to the linear predicator to predict a next periodical value of the bonded phase signal; a periodical predication value is checked by the corrector to be correct and then is transmitted to the divider for dividing by the bonded phase multiple to obtain a quotient which is latched by the latch; the subtract counter carries out the subtract counting by taking the quotient in the latch as a module value; and an overflow signal of the subtract counter is a frequency doubling signal. The device has compact structure; and the method and the device have the advantages of high integration degree, flexible configuration of frequency doubling coefficient, wide frequency doubling range, capability of periodical carrying out thelinear detection on the bonded phase signal, high frequency doubling precision and higher stability and reliability.

Description

technical field [0001] The invention relates to the design of a Field Programmable Gates Array (Field Programmable Gates Array, FPGA), which is a method and a device for generating a key-phase frequency multiplication signal in the whole cycle sampling of the vibration signal of a rotating machine. Background technique [0002] There are a large number of large-scale rotating machinery and equipment in the process of electric power, petrochemical, and metallurgy. They are the foundation of the national economy. Once such machinery fails, it may cause a chain reaction, causing the entire machinery or even the entire set of equipment to fail to work normally, resulting in huge economic losses. It can even cause serious catastrophic casualties. In order to manage and use this kind of major key equipment well, improve the stability, reliability, safety, service efficiency and life of this kind of machinery, and avoid causing major accidents and affecting social production, the c...

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Problems solved by technology

At present, it is generally implemented by a group of separate functional devices working together, so there are many components and large volumes, which cannot adapt to the trend of distributed miniaturization, such as "Steam Turbine Technology", Volume 45, Issue 1, February 2003, "A A new type of key phase signal processing circuit and its error analysis", using various digital discrete components including addition counters, frequency dividers with a frequency division factor of 64, and subtraction counters to realize the frequency multiplication circuit of key phase signals. The frequency circuit can realize the function of frequency multiplication, but it uses a large number of discrete components, which takes up a lot of circuit area, and the frequency multiplication number is a single 64 frequency multiplication, which cannot be used for period prediction and error correction.

In addition, the frequency multiplication method of the phase-locked loop cannot meet the situation that the key-phase signal changes greatly, and the flexibility and precision are not high. In the document "VHDL-based digital "Frequency Multiplier Design" discusses the shortcomings of the phase-locked loop frequency multiplication method

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