Method and device for acquiring signals, computer storage medium and electronic equipment

Abstract

The invention discloses a method and device for acquiring signals, a computer storage medium and electronic equipment. The device comprises a signal processing unit, a superimposed modulation unit anda demodulation and judgment unit, wherein the signal processing unit is used for performing gain adjustment on an input digital quantity signal through two groups of gain adjustment parameters to obtain corresponding stable direct-current voltage signals, performing voltage-controlled oscillation processing on the stable direct-current voltage signals respectively, and outputting two paths of dynamic carrier signals through two channels; the superimposed modulation unit is used for performing superimposed modulation on one path of dynamic carrier signal output by a voltage-controlled oscillator respectively through a preset modulation wave signal to obtain corresponding frequency shift keying signals; and the demodulation and judgement unit is used for demodulating one path of frequency shift keying signal output by each synthetic modulator respectively, and judging whether the digital quantity signal is valid or not according to demodulation results obtained by demodulating the frequency shift keying signals with the two paths of modulators. Through the adoption of the method and the device in the embodiment of the invention, the digital quantity signal acquisition performance and quality are improved.

Description

technical field [0001] This article involves but is not limited to electronic technology, especially a method, device, computer storage medium and electronic equipment for collecting signals. Background technique [0002] For control systems with functional safety requirements such as rail transit and nuclear power, the system needs to reach a safety level of SIL4 (SIL is a division of functional safety levels first proposed in the IEC61508 functional safety standard promulgated in 1998, and SIL4 represents the highest safety. grade). This type of control system generally needs to collect a certain number of safe digital signals as key input conditions for system control, such as train brake feedback signals in the rail transit field, control rod position signals in the nuclear power field, etc.; The signal must be accurate, otherwise it may cause dangerous accidents. Therefore, special functional safety circuits must be used for the acquisition of safe digital signals, an...

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Problems solved by technology

[0004] The above acquisition circuit has the following problems: 1. It can only realize the judgment of the presence or absence of the safety digital signal, and cannot realize effective quantitative reading of the amplitude of the safety digital signal; 2. The input range of the signal level that can be collected is narrow, It is generally fixed within the range of 24 levels of direct current (DC) commonly used in industry, and does not support AC signal acquisition; 3. The effective threshold judgment of the acquisition results has a large fuzzy space, which is easily affected by the input level range and temperature, and there may be errors that affect safety. In addition, most acquisition circuits use optocouplers for signal modulation, and problems such as inherent temperature drift and poor parameter consistency of static digital signals will reduce acquisition accuracy; the inherent light attenuation characteristics of optoelectronic devices affect the use time of acquisition circuits; The acquisition circuit uses a safety relay with a mechanical structure, which has problems such as bulky size, slow response speed, invariable input voltage range, and high failure rate.

In summary, the performance of the acquisition circuit of the existing safety digital signal in the related art needs to be improved, which affects the acquisition quality of the safety digital signal

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