CN1420629A - Universal multi-channel A/D isolating converter - Google Patents
Universal multi-channel A/D isolating converter Download PDFInfo
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- CN1420629A CN1420629A CN 01134847 CN01134847A CN1420629A CN 1420629 A CN1420629 A CN 1420629A CN 01134847 CN01134847 CN 01134847 CN 01134847 A CN01134847 A CN 01134847A CN 1420629 A CN1420629 A CN 1420629A
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Abstract
An universal analog-digital isolation converter with multichannel comprises a multiplex switch with multichannel in light coupling type to receive the analog signal, an analog-digital conversion module to convert a selected channel of analog signal into a digital signal, and a light isolator to transmitt this digital signal to the next stage of processing by light coupling means. The power supply for the convertor is also obtained by isolating technical means to avoid the disturbance from the power supply and the multiplex switch in light coupling type is composed of multigroup of photo MOS relay which has a very high impedance value and a very good property of high voltage resistance in order to ensure a good result of isolation between the channels.
Description
Technical field
The present invention relates to adc, especially a kind of simulation of universal multi-channel is to digital isolating converter, for having the transducer of the box-like multiplex's switch of multichannel optocoupler, the high impedance, the high pressure resistant property that are possessed by the box-like multiplex's switch of this optocoupler provide good isolation to act between each passage, and can avoid high pressure to infringement that passage caused.
Background technology
In communication system, general is earlier to carry out signal analysis, processing for giving operating system after the digital signal with analog-signal transitions, so simulation is promptly played the part of a key player to the transducer of digital signal.In A/D converter, can utilize the switching device shifter of multiplex's switch, more selected specific analog signal be carried out conversion process thereafter as many groups analog input signal.Please refer to shown in Figure 3, it is the internal structure schematic diagram of multiplex's switch of commonly using, this multiplex's switch has eight groups of signal input channel CH1～CH8, each is organized signal input channel CH1～CH8 and all has positive and negative two input terminals, each positive and negative terminal all is connected to the sub-A of common output end, B respectively by an analog switch 30, and whether each analog switch 30 then controls its conductings by a decoder 31; After this decoder 31 triggers the analog switch 30 synchronous conductings of first group of input channel CH1 two positive and negative terminal, then the input signal of first group of input channel CH1 can give the next stage circuit by lead-out terminal A, B output signal, and all the other inputs simultaneously feed channel C H2-CH8 and are cut-off state.
Yet this kind commonly used multiplex's switch of being made up of analog switch 30 and then had the not good shortcoming of isolation between the passage.Please refer to Fig. 4 A, shown in the B, suppose that first group of input channel CH1 is conducting state, and all the other are respectively organized input channel CH2～CH8 and are all and end, but the passage that ends is not high enough because of the resistance value of its internal simulation switch 30, as interference power 32 result from the first input channel CH1 of conducting and the second input channel CH2 that ends between the time, then high pressure will two passages runs through simultaneously and burns, can produce the situation of above-mentioned interference power 32, for example have between each passage and itself be subjected to electrostatic interference, or the electromagnetic interference EMI that electronic equipment sent on every side, even the high pressure that thunderbolt is produced all might become interference power 32.
Summary of the invention
For overcoming the above-mentioned design disappearance of commonly using, purpose of the present invention provides a kind of simulation of universal multi-channel to digital isolating converter, it mainly has the box-like multiplex's switch of optocoupler of the input channel of group more than, so that a splendid isolation effect to be provided between each input channel, the high pressure that avoids interference power supply is to destruction that input channel produced as switch element for the optical relay of this multiplex's switch by possessing high impedance, high pressure resistant property.
For reaching above-mentioned purpose, the simulation of universal multi-channel of the present invention to digital isolating converter mainly comprise a box-like multiplex's switch of optocoupler and that possesses many group input channels in order to the simulation of switching signal to digital modulus of conversion group, wherein each input channel of this multiplex's switch all has positive and negative two input terminals, and each input terminal all is made up of an optical relay, each optical relay is controlled its conduction and cut-off state by aforementioned simulation to digital modulus of conversion group, carries out the conversion of signals operation with one group of input channel that decision should be accepted wherein.
The simulation of universal multi-channel of the present invention is to digital isolating converter, and it specifically includes: one in order to being that the simulation of digital signal is to digital modulus of conversion group with analog signal conversion; One has the box-like multiplex's switch of optocoupler of many group signal input channels, and its output is connected to aforementioned simulation to digital modulus of conversion group, and the box-like multiplex's switch of this optocoupler is controlled digital modulus of conversion group by aforementioned simulation; One data transmission isolated location connects aforementioned simulation to digital modulus of conversion group, in order to the digital signal of self simulation to digital modulus of conversion group output is coupled in next control system; One power source conversion is isolated module, connects this simulation to digital modulus of conversion group, can provide a working power to give aforementioned simulation to digital modulus of conversion group; Wherein this simulation can be selected in the optical coupling formula multiplex (MUX) switch wherein one group signal input channel to digital modulus of conversion group, and is by the output of aforesaid data transmission isolated location after the digital signal with the analog signal conversion in this signal input channel.
Wherein above-mentioned simulation is controlled the box-like multiplex's switch of this optocoupler to digital modulus of conversion group by a passage input selector.The box-like multiplex's switch of above-mentioned optocoupler, include: the plural groups input channel, each passage has positive and negative input terminal, and each positive and negative input terminal is formed with one first optical relay and second optical relay respectively, wherein aforementioned first optical relay includes: one first light field effect transistor, it collects the very positive input terminal of signal, and its emitter-base bandgap grading is connected to a positive output end; One first light-emitting diode, its anode tap is connected to a positive supply, and its cathode terminal is by this passage input selector control; Aforementioned second optical relay comprises: one second light field effect transistor, and it collects the very negative input end of signal, and its emitter-base bandgap grading is connected to a negative output terminal; One second light-emitting diode, its anode tap is connected to aforementioned positive supply, and its cathode terminal is controlled by the aforementioned channels input selector; After aforementioned simulation is sent control signal to digital modulus of conversion group and is given this passage input selector, after the cathode terminal that gives first, second light-emitting diode by the accurate position of this passage input selector output LOW voltage signal makes its conducting, control first, second light field effect transistor conducting respectively by the light signal that this first, second light-emitting diode produced, and then signal is passed to by positive and negative input be back to simulation behind the positive and negative output digital modulus of conversion group is carried out conversion of signals.
Description of drawings
Fig. 1: block schematic diagram of the present invention;
Fig. 2: the structural representation of the box-like multiplex's switch of optocoupler among the present invention;
Fig. 3: one commonly uses the internal structure schematic diagram of multiplex's switch;
Fig. 4: commonly use the schematic diagram that multiplex's switch is disturbed by high pressure.
Figure number:
The box-like multiplex's switch of 1 optocoupler
2 simulations are to digital modulus of conversion group
3 passage input selectors
4 second data transmission units
5 power source conversion are isolated module
10,10 ' optical relay
11,11 ' light field effect transistor
12,12 ' light-emitting diode
30 analog switches
31 decoders
100 control system
101 first optical isolators
102 power supplys
CH1～CH8 signal input channel
A, B lead-out terminal
The VCC positive supply
Embodiment
Please refer to shown in Figure 1, for universal multi-channel of the present invention simulation to the calcspar of digital isolating converter framework and be applied to the schematic diagram of a control system 100, wherein this control system 100 is transmitted by one first optical isolator 101 and formation data of the present invention.
The present invention mainly includes a simulation to digital modulus of conversion group 2, this simulation is connected to the box-like multiplex's switch 1 of an optocoupler to the control pin of digital modulus of conversion group 2 by a passage input selector 3, the output of the box-like multiplex's switch 1 of this optocoupler then directly connects back simulation to digital modulus of conversion group 2, this simulation is simultaneously carried out the sequence data transmission to first optical isolator 101 of digital modulus of conversion group 2 by one second optical isolator 4 and control system 100, moreover this simulation obtains working power by power source conversion isolation module 5 from a power supply 102 to digital modulus of conversion group 2.
The second above-mentioned optical isolator 4 takes first optical isolator 101 of optical coupling mode and control system 100 to reach isolation and data laser propagation effect, so can specifically implement by an optical coupler; And this power source conversion isolation module 5 is obtained operating voltage in the modes of non-direct contact from power supply 102 ends equally, and supplies to give simulation to digital modulus of conversion group 2 after being converted to DC power supply.
See also shown in Figure 2, the box-like multiplex's switch 1 of above-mentioned optocoupler has many group signal input channel CH1～CH8, in present embodiment, have eight groups of input channels, wherein each input channel CH1～CH8 accepts different input signals respectively, and each input channel CH1～CH8 all possesses positive and negative two input terminals is arranged, and each input terminal mainly is made up of an optical relay 10.
To form its positive input terminal of the first input channel CH1, the main element of this optical relay 10 includes a light field effect transistor 11 and a light-emitting diode 12, the collector terminal of this light field effect transistor 11 is a signal input part, and its emitter-base bandgap grading end then connects a positive output terminal A; The anode tap of aforementioned again light-emitting diode 12 is connected to a positive supply VCC by a resistor, and its cathode terminal then is connected to a simulation to digital modulus of conversion group 20.The structure and the positive input terminal of negative input end of this first input channel CH1 are identical, be similarly by an optical relay 10 ' institute and form, but its light field effect transistor 11 ' the collection utmost point then be negative input end, its emitter-base bandgap grading then is connected to another negative output terminal B.
And the internal structure of all the other input channel CH2～CH8 is identical with the first input channel CH1, so repeat no more.When supposing that desire is exported the signal of the first input channel CH1, at first digital modulus of conversion group 2 outputs one control signal is given passage input selector 3 by this simulation, the signal that the accurate position of low-voltage is provided by this passage input selector 3 to two light-emitting diodes 12,12 ' cathode terminal, after two light-emitting diodes 12,12 ' conducting are luminous, promptly transfer conducting to behind two corresponding light field effect transistors 11, the 11 ' receiving optical signals by cut-off state originally, so the signal of positive and negative input terminal just can be passed to lead-out terminal A, B, and then exports the next stage circuit to.
Because of light field effect transistor 11 when the cut-off state, its inner impedance own is up to more than 1000M ohm, so two passages have the good isolation effect each other, the withstand voltage degree of its voltage is up to 350 volts, even so have interference power that the also anxiety of no-voltage destruction takes place, and then guarantee the normal running of multiplex's switch.
And the present invention at first by this simulation to digital modulus of conversion group 2 control aforementioned channels input selectors 3 selective light manifold type multiplex (MUX) switches 1 wherein behind the passage, and capture the analog input signal of this passage, after by simulation digital modulus of conversion group 2 being converted to digital signal, this digital signal is fed through in the sequence transmission mode in the control system 100 of next stage by second optical isolator 4, carries out further analyzing and processing to make 100 pairs of signals of this control system.
The above embodiment only is explanation technological thought of the present invention and characteristics, its purpose makes the personage who has the knack of this skill can understand content of the present invention and is implementing according to this, when not limiting claim of the present invention with it, promptly the equalization of doing according to disclosed spirit generally changes or modifies, and must be encompassed in the claim scope of the present invention.
Claims (3)
1. the simulation of a universal multi-channel is characterized in that digital isolating converter: it includes: one in order to being that the simulation of digital signal is to digital modulus of conversion group with analog signal conversion; One has the box-like multiplex's switch of optocoupler of many group signal input channels, and its output is connected to aforementioned simulation to digital modulus of conversion group, and the box-like multiplex's switch of this optocoupler is controlled digital modulus of conversion group by aforementioned simulation; One data transmission isolated location connects aforementioned simulation to digital modulus of conversion group, in order to the digital signal of self simulation to digital modulus of conversion group output is coupled in next control system; One power source conversion is isolated module, connects this simulation to digital modulus of conversion group, can provide a working power to give aforementioned simulation to digital modulus of conversion group; Wherein this simulation can be selected in the optical coupling formula multiplex (MUX) switch wherein one group signal input channel to digital modulus of conversion group, and is by the output of aforesaid data transmission isolated location after the digital signal with the analog signal conversion in this signal input channel.
2. the simulation of universal multi-channel as claimed in claim 1 is characterized in that digital isolating converter: this simulation is controlled the box-like multiplex's switch of this optocoupler to digital modulus of conversion group by a passage input selector.
3. the simulation of universal multi-channel as claimed in claim 2 is to digital isolating converter, it is characterized in that: the box-like multiplex's switch of this optocoupler, include: the plural groups input channel, each passage has positive and negative input terminal, and each positive and negative input terminal is formed with one first optical relay and second optical relay respectively, wherein aforementioned first optical relay includes: one first light field effect transistor, and it collects the very positive input terminal of signal, and its emitter-base bandgap grading is connected to a positive output end; One first light-emitting diode, its anode tap is connected to a positive supply, and its cathode terminal is by this passage input selector control; Aforementioned second optical relay comprises: one second light field effect transistor, and it collects the very negative input end of signal, and its emitter-base bandgap grading is connected to a negative output terminal; One second light-emitting diode, its anode tap is connected to aforementioned positive supply, and its cathode terminal is controlled by the aforementioned channels input selector; After aforementioned simulation is sent control signal to digital modulus of conversion group and is given this passage input selector, after the cathode terminal that gives first, second light-emitting diode by the accurate position of this passage input selector output LOW voltage signal makes its conducting, control first, second light field effect transistor conducting respectively by the light signal that this first, second light-emitting diode produced, and then signal is passed to by positive and negative input be back to simulation behind the positive and negative output digital modulus of conversion group is carried out conversion of signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134847 CN1420629A (en) | 2001-11-15 | 2001-11-15 | Universal multi-channel A/D isolating converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01134847 CN1420629A (en) | 2001-11-15 | 2001-11-15 | Universal multi-channel A/D isolating converter |
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| CN1420629A true CN1420629A (en) | 2003-05-28 |
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| CN 01134847 Pending CN1420629A (en) | 2001-11-15 | 2001-11-15 | Universal multi-channel A/D isolating converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105045188A (en) * | 2015-08-27 | 2015-11-11 | 武汉华宇科技发展有限公司 | Multichannel selection module |
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2001
- 2001-11-15 CN CN 01134847 patent/CN1420629A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105045188A (en) * | 2015-08-27 | 2015-11-11 | 武汉华宇科技发展有限公司 | Multichannel selection module |
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