A level compatibility processing circuit of input signal
A technology for processing circuits and input signals, applied in the direction of logic circuit interface devices, logic circuit connection/interface layout, etc., can solve the problems of easy coupling of interference signals for input signals, complex level conversion circuits, etc., and achieve the effect of suppressing interference signals
Active Publication Date: 2018-09-28
陕西秦川智能机床研究院有限公司
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[0005] The invention proposes a level compatibility processing circuit for input signals, which solves the problems in the prior art that the level conversion circuit is complex and the input signal is easily coupled with interference signals
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[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0020] Such as figure 1 - image 3 As shown, the level compatibility processing circuit of the input signal includes a voltage comparison circuit, the input terminals of the voltage comparison circuit are respectively connected to the voltage dividing current limiting circuit and the constant voltage generation circuit, and the output terminal of the voltage comparison circuit is connected to a buffer drive circuit , the output end of the buffer drive circuit is c...
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The invention provides a level compatibility processing circuit for input signals. The level compatibility processing circuit comprises a voltage comparison circuit, the input end of the voltage comparison circuit is separately connected with a voltage dividing and current limiting circuit and a constant voltage generating circuit, the output end of the voltage comparison circuit is connected with a cache driving circuit, the output end of the cache driving circuit is connected with a first level conversion circuit, the output end of the first level conversion circuit is connected with a logic coding circuit, and the output end of the logic coding circuit is connected with a second level conversion circuit. The level compatibility processing circuit can effectively convert the level of the input signals with smallest space and fewest components, suppress interference signals coupled to the input signals and isolate high and low levels.
Description
technical field [0001] The invention belongs to the technical field of numerical control, and in particular relates to a level compatibility processing circuit of an input signal. Background technique [0002] At present, in addition to controlling each servo axis for interpolation, the machine tool numerical control system also needs to perform machine tool logic control (that is, PLC). When performing PLC control, each 24V input signal must be processed for level compatibility and then collected into the NC. After logic operations, the results are output to control each switch. [0003] Now, to process the 24V level into a 5V signal, an optocoupler isolation circuit is generally used. Because generally each NC mainframe has to handle 64 input points (24V) and 48 output points (at least 24V), the optocoupler isolation processing circuit generally occupies a large physical space, which is necessary for the NC mainframe box with limited space. is difficult to achieve. [0...
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IPC IPC(8): H03K19/0175
CPCH03K19/017509
Inventor 郝来成杨云周启轩
Owner 陕西秦川智能机床研究院有限公司