A switching input acquisition circuit suitable for a wide range of levels

A technology of switching value input and acquisition circuit, which is applied in the direction of analog-to-digital converters, etc., can solve the problems of poor judgment of input high and low levels, poor versatility of acquisition circuit, and few acquisition channels, so as to achieve stable output signal, isolation load capacity, The effect of improving the carrying capacity

CN104993829BActive Publication Date: 2018-05-29ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-05-29

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Abstract

The invention discloses a switching value input acquisition circuit suitable for a wide range of levels, comprising a sequentially connected multi-channel differential filter unit, a multiple-channel selection switch unit, an A / D conversion unit and a control unit, the multi-channel differential filter The unit collects the switching signals of multiple channels and filters them before inputting them to the multi-channel selection switch unit. After the signal is sent to the control unit, the control unit compares the digital signal with the preset high level threshold and low level threshold to determine whether the switch signal corresponding to the digital signal is high level or low level . The switching value input acquisition circuit suitable for wide-range levels of the present invention has the advantages of simple structure, being applicable to different wide-range levels, high integration, and good heat dissipation performance.
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Description

technical field

[0001] The invention mainly relates to a switch signal acquisition circuit, in particular to a switch input acquisition circuit suitable for a wide range of levels. Background technique

[0002] The control devices used on railway locomotives all have the function of digital input acquisition. Currently used digital input acquisition circuits are generally implemented using transformers or optocoupler isolation. The disadvantages of this circuit are as follows:

[0003] (1) At present, there are three main control voltage levels on locomotives, namely DC24V, DC74V, and DC110V. However, the existing acquisition circuits on locomotives can only configure input resistors for a certain level system. It cannot be used universally, and different plug-ins need to be configured on locomotives with different voltage standards to realize it, and the universality of the acquisition circuit is poor;

[0004] (2) The number of components in the existing digital input a...

Examples

Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Such as Figure 1 to Figure 6 As shown, the digital input acquisition circuit suitable for a wide range of levels in this embodiment includes a sequentially connected multi-channel differential filter unit 1, a multiplex switch unit 2, an A / D conversion unit 3 and a control unit 4, and multiple The differential filtering unit 1 collects and filters the switching signals of multiple channels and inputs them to the multi-channel selection switch unit 2. The multi-channel selection switch unit 2 selects the switching signals of the corresponding channels and inputs them to the A / D conversion unit 3. The D conversion unit 3 converts the digital signal into a digital signal and sends it to the control unit 4. The control unit 4 compares the digital signal with the preset high level threshold and low level threshold to determine whether the sw...