Safe analog voltage acquisition implementation circuit

Abstract

A safe analog voltage acquisition circuit comprises a hardware heterogeneous circuit, including an A-series hardware circuit, a B-series hardware circuit, a reverse circuit and an intersystem isolation unit. The A-series hardware circuit and the B-series hardware circuit form a symmetrical two-out-of-two structure, and an input end is connected with the A-series hardware circuit and is connected with the B-series hardware circuit after passing through the reverse circuit. The A-series hardware circuit and the B-series hardware circuit are also connected through an intersystem isolation unit. Each of the A-series hardware circuit and the B-series hardware circuit comprises a protection circuit, a differential filter circuit, a differential amplification circuit, a low-pass filter circuit, an AD acquisition circuit, an acquisition circuit power supply unit, a safety part power supply unit, a safety circuit and acquisition circuit isolation unit and a logic processing unit which are sequentially arranged. The two-out-of-two design is used for analog voltage collection, and safe collection of the analog voltage is achieved. Hardware heterogeneous design is used for analog voltage acquisition, and safe acquisition of analog voltage and safe acquisition of multipath AC / DC differential and single-end voltage signals are realized.

Description

technical field [0001] The invention belongs to the technical field of track circuits, in particular to a safe analog voltage acquisition realization circuit. Background technique [0002] The voltage acquisition device is a common device in industrial applications. The existing voltage acquisition method mainly focuses on the realization of multi-channel voltage acquisition, improvement of sampling accuracy, increase of sampling rate, reduction of cost, and reduction of volume. Currently, there is no discovery that can be used in railways. The safe voltage acquisition method in the safety field such as the railway, the non-safety voltage acquisition device cannot be used in the safety field such as the railway. [0003] The analog voltage acquisition device is a commonly used analog quantity acquisition device in the industrial field. Users can use the voltage acquisition device to collect the actual waveform of the voltage and send control instructions to various execution...

AI Technical Summary

Problems solved by technology

[0004] Existing voltage acquisition devices mainly focus on the realization of multi-channel voltage acquisition, volume reduction, and cost reduction. For example, the "multi-channel voltage acquisition module 201810683126.1" mainly focuses on the realization of multi-channel voltage acquisition, easy expansion, and simple circuit structure. and other performance, there is currently no method to realize the voltage acquisition that can meet the safety requirements

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