CN101187676B

CN101187676B - Selection circuit of multi-path input and double-path output

Info

Publication number: CN101187676B
Application number: CN2007101935162A
Authority: CN
Inventors: 周刚
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2007-12-11
Filing date: 2007-12-11
Publication date: 2010-06-16
Anticipated expiration: 2027-12-11
Also published as: CN101187676A

Abstract

The invention discloses a selective circuit with multi-channel input and double-channel output, which belongs to the technical field of input and output controlling and in particular relates to the selective circuit with the multi-channel input and the double-channel output. The selective circuit comprises a first-grade gating and a second-grade gating, and is mainly composed of signal gating blocks. Signal returning lines of a same type are connected together on the output end of the signal gating blocks, the signal output ends of the signal grating blocks which are used in the first-grade gating are connected with the output ends of the signal returning lines respectively. Gating feedback information of the signal gating blocks is taken as an important reference to decide whether a signal gating is successful or not, and as an important condition to guarantee that only one signal gating block is grated in the first-grade grating. The selective circuits which are provided by the invention can guarantee that the signals and the signal returning lines which are selected from a plurality of signals are correct.

Description

A kind of selection circuit of multi-path input and double-path output

Technical field

The invention belongs to input and output control technology field.Refer more particularly to a kind of selection circuit of multi-path input and double-path output.

Background technology

During signal testing, the reference potential of reference be arranged, be referred to as the signal loop line.Therefore, test a signal, on physical significance, be actually and survey two connection terminals, i.e. one road signal terminal and one road signal loop line terminal.The kind of signal generally can be divided into digital signal, simulating signal and power signal etc., and signal of the same type can a shared signal loop line, dissimilar signals, its signal loop line difference.

Tested instrument will be used for debugging sometimes or the various set of signals of fault detect are drawn so that the interface shape of connector is concentrated, for example, measured signal has m type, every type has n signal, then detect the individual effective test point of m* (n+1) is arranged on the interface, wherein m*n belongs to the signal testing point, and m belongs to three kinds of signal loop lines.Past method of testing commonly used is by hand testing tool to be connect signal to be connected with the signal that will test with two terminals that connect the signal loop line.This manual test mode is bothersome, makes mistakes easily again.

For tested instrument with polymorphic type, multichannel measured signal, modelled signal selects circuit to be connected with tested instrument, utilize computer control signal to select circuit working, realization selects one road signal and the output of one road signal loop line to detect from multiple signals inputs, and this is for increasing work efficiency and to test accuracy significant.

Summary of the invention

The object of the present invention is to provide a kind of selection circuit of multi-path input and double-path output to realize from have polymorphic type, multichannel measured signal, selecting one road signal and corresponding signal loop line.

To achieve these goals, the invention provides a kind of selection circuit, as shown in Figure 1, signal gating is made up of the two-stage gating, and first order gating is realized selecting two-way output from multiple signals, and second level gating is realized the selected signal output of first order gating.

The multichannel input is divided into three types: category-A signal, category-B signal and C class signal.Category-A signal gating combination 110 has A road, i road signal, and category-A signal 1 is by signal gating module 111 gatings, and category-A signal i is by signal gating module 112 gatings.The signal loop line of each signal gating module input of category-A altogether together.The category-B signal is similar to the combination of category-A signal gating with the combination of C class signal gating.The signal of each signal gating module and signal loop line all connect together separately at output terminal.

When signal is selected, class signal gating combination can only be arranged, and have only one of them signal gating module action, signal that is selected and signal loop line are called as first order gating.The output of first order gating is as the input of second level gating 140, and the output of second level gating 140 is exactly the final output of selecting circuit.Second level gating mainly shields.

Described two-way output selects circuit to export one road signal and corresponding signal loop line;

Described first order gating is selected the multichannel input by the signal gating module, one road signal and the output of corresponding signal loop line;

Described second level gating by the signal gating module controls, is realized the output of first order gating output gating;

Described signal gating module, as Fig. 2, with the elect switching device of circuit of the relay 220 with four groups of switches, wherein two groups of switches are used for the input and output of signal and signal loop line, one group of switch input terminal ground connection, an other end is drawn as gating feedback, by digital signal as the gating control signal, through the switch closure and the disconnection of driving circuit 210 pilot relays, the output of the signal of control input end.

Described driving circuit, as Fig. 3, combine with R1, R2, R3 and R4, cooperate the driving circuit of the two-way direction device formation relay K 1 of SN74LS06N logic negate chip U1, realize the closed and disconnected control of relay by the high-low level of digital I/O signal;

Described gating feedback by one group of switch of relay feedback signal as this actuating of relay, can be come the duty of pilot signal gating module by this feedback signal of computer acquisition.

The invention has the beneficial effects as follows the selection circuit that the output of a kind of multi-path input and double-path is provided, can increase work efficiency and test accuracy.

Description of drawings

Fig. 1 signal selecting circuit structural representation;

Fig. 2 signal gating modular structure synoptic diagram;

Fig. 3 signal gating module principle figure;

Fig. 4 multichannel input signal interface distribution schematic diagram.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer,, the present invention is done step detailed description below in conjunction with accompanying drawing.

Illustrate, select three types of input signals of circuit design: category-A signal, category-B signal and C class signal, wherein the category-A signal is 16,4 of 14 of category-B signals and C class signals, input interface is 37 core connectors, as shown in Figure 4.Select circuit to need 35 signal gating modules.Connect the detection mouth and the input interface of selecting circuit of tested instrument, must guarantee that signal of the same type is connected correctly with the signal loop line.

At first will select the sequence number of each signal end of circuit input end or the information such as corresponding relation of position, signal gating module numbering and Computer I/O IO interface to import in the computer program.The gating feedback information of each signal gating module collects in the computing machine through I/O, and as judging the whether important evidence of gating of signal gating module, this also is an essential condition of guaranteeing a signal gating module of a gating in the gating for the first time.

Job step is that after system powered on, the original state of each signal gating module all was an off-state.According to sequence number or the position of the signal that will detect at the selection circuit input end, Computer Analysis goes out the concrete signal gating module numbering that needs action, send steering order only for a signal gating module and make this module gating closure, confirm according to the gating feedback information whether gating is successful.Confirm errorless after, send out work order for again second level gating module.Selecting circuit output end like this is exactly the signal that will detect, and directly send the input end of testing tool to be used for test.

The present invention's " a kind of selection circuit of multi-path input and double-path output " not only is confined to the above embodiments, can carry out being applied after the multiple variation in the scope that technological thought of the present invention allows.

Allly carry out equivalence with this claim and change and revise, all should belong to covering scope of the present invention.

Can guarantee that by selection circuit provided by the invention signal and the signal loop line selected are correct from polytype signal, and can increase work efficiency effectively and test accuracy.

Claims

1. the selection circuit of a multi-path input and double-path output is characterized in that signal gating is made up of the two-stage gating, and first order gating is realized selecting two-way output from multiple signals, and second level gating is realized the selected signal output of first order gating;

Described multichannel input, signal input part comprises three types multiple signals, be respectively category-A signal, category-B signal and C class signal, every type of signal all has one tunnel shared signal loop line, wherein category-A signal i, category-B signal m, C class signal n, the signal loop line of various types of signal is respectively category-A signal loop line, category-B signal loop line and C class signal loop line;

Described first order gating is selected the multichannel input by first order signal gating module, one road signal and the output of corresponding signal loop line;

Described second level gating by second level signal gating module controls, is realized selecting output to select output the first order;

Described first order signal gating module, the signal gating module (121 and 122) of the signal gating module of category-A signal (111 and 112), category-B signal, the signal gating module (131 and 132) of C class signal, with the elect switching device of circuit of the relay with four groups of switches, wherein two groups of switches are used for the input and output of signal and signal loop line, one group of switch input terminal ground connection, an other end is drawn as the gating feedback, by digital signal as the gating control signal, through the switch closure and the disconnection of driving circuit pilot relay, the output of the signal of control input end;

Described gating feedback selects circuit that gating feedback signal interface is arranged, and can come the duty of pilot signal gating module by computer acquisition gating feedback signal.

2. according to the selection circuit of the described a kind of multi-path input and double-path output of claim 1, it is characterized in that, by one group of switch of relay feedback signal as this actuating of relay.