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Switch detection circuit compatible with high and low levels

A switch detection circuit, high and low level technology, applied in the direction of logic circuits with logic functions, etc., can solve the problems of long change cycle, multiple hardware versions, high generation and management costs, and achieve version reduction, cost saving, and interface resources. Effect

Pending Publication Date: 2022-04-15
河南嘉晨智能控制股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In use, the switch has three states of pulling up high level "+", pulling down low level "-" and disconnecting "NC". In use, "+" and "-" indicate signal input, and NC indicates input stop. Currently If the detection and sampling circuit recognizes "+", but cannot distinguish between "-" and "NC", and cannot achieve "+" and "-" level compatibility, the existing high level and low level compatibility needs to be changed inside the ECU Hardware, the change cycle is very long, changing the ECU hardware for the realization of high-level and low-level compatibility will lead to multiple ECU hardware versions, high generation and management costs

Method used

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  • Switch detection circuit compatible with high and low levels
  • Switch detection circuit compatible with high and low levels
  • Switch detection circuit compatible with high and low levels

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with drawings and embodiments.

[0020] Such as figure 1 with figure 2 As shown, a switch detection circuit compatible with high and low levels includes a detection circuit connected to the switch and a comparator circuit connected to the output terminal of the detection circuit. The comparator circuit expresses the level value signal generated by the detection circuit in binary, The comparator circuit includes a first comparator circuit, a second comparator circuit and a third comparator circuit, the first comparator circuit and the second comparator circuit are connected in parallel to the input end of the third comparator circuit, and the switching value input detection After the circuit, the Vi signal of the level value is generated, and the Vi signal of the generated level value passes through the first comparator circuit and the second comparator circuit respectively, and outputs the switch tru...

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Abstract

The invention discloses a switch detection circuit compatible with high and low levels, which comprises a detection circuit and comparator circuits, the comparator circuits represent level value signals generated by the detection circuit in a binary manner, and the comparator circuits comprise a first comparator circuit, a second comparator circuit and a third comparator circuit, the first comparator circuit and the second comparator circuit are connected in parallel and then connected with the input end of the third comparator circuit, a Vi signal of a level value is generated after the switching value is input into the detection circuit, and a switching true value OH and a switching true value OL are output after the Vi signal of the generated level value passes through the first comparator circuit and the second comparator circuit respectively. And the switch truth value OH or the switch truth value OL is input into the third comparator circuit to generate a switch truth value O. Through the arrangement of the detection circuit and the comparator circuits, the compatibility of high and low levels is realized, the increasingly complicated and diversified use requirements are met with few interface resources, hardware or BOM versions are reduced, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of circuit detection, in particular to a switch detection circuit compatible with high and low levels. Background technique [0002] Switch detection is usually carried out by ordinary I / O sampling, as a digital quantity processing, there is only one level at a certain time, and the MCU has determined the effective level at the beginning of the design: 1 or 0. In use, the switch has three states of pulling up high level "+", pulling down low level "-" and disconnecting "NC". In use, "+" and "-" indicate signal input, and NC indicates input stop. Currently If the detection and sampling circuit recognizes "+", but cannot distinguish between "-" and "NC", and cannot achieve "+" and "-" level compatibility, in order to achieve high level and low level compatibility, it is necessary to change the internal ECU For hardware, the change cycle is very long. Changing the ECU hardware for the realization of high-level...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/20
Inventor 韩新红李飞姚欣
Owner 河南嘉晨智能控制股份有限公司
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