CN202083932U - Multipath digital quantity input circuit based on Darlington transistor array - Google Patents
Multipath digital quantity input circuit based on Darlington transistor array Download PDFInfo
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- CN202083932U CN202083932U CN2011201607738U CN201120160773U CN202083932U CN 202083932 U CN202083932 U CN 202083932U CN 2011201607738 U CN2011201607738 U CN 2011201607738U CN 201120160773 U CN201120160773 U CN 201120160773U CN 202083932 U CN202083932 U CN 202083932U
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- darlington transistor
- transistor array
- digital quantity
- input circuit
- quantity input
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Abstract
The utility model discloses a multipath digital quantity input circuit based on a Darlington transistor array. The multipath digital quantity input circuit comprises the Darlington transistor array, wherein each signal input end of the Darlington transistor array is connected with a voltage regulator tube and a diode in order, a pull-up resistor is connected between the voltage regulator tube and the diode, and each signal output end of the Darlington transistor array is connected with a pull-up resistor and a pull-down capacitor. The multipath digital quantity input circuit can drive seven sets of digital quantity input signals at the same time, has the characteristics of low input current, wide temperature scope, high current gain, high driving ability, low power dissipation, small outside size, low time delay, and the like, and is suitable for a plurality of industrial control PLC systems having requirements on high speed and large power.
Description
Technical field
The utility model relates to industry control electrical equipment PLC digital quantity input circuit, particularly a kind of multi-path digital amount input circuit based on the Darlington transistor array.
Background technology
The digital quantity input circuit is an important component part of industrial control field.In the digital quantity input that industrial control field often need be used multichannel,,, be the problem that circuit designer is relatively had a headache particularly with low level digital circuit interface to the detection control of multi-path digital amount always.If adopt traditional method for designing, generally need relate to high power switch triode, relay, controllable silicon etc., volume is bigger, and it is bigger to take the printed board area, the problem that the design of hardware circuit, debugging and heat radiation all bother.Therefore, seek a kind of integrated level height, can multi-path digital amount input, scalable signal, circuit easy to use be power circuit designer's pursuit always.
The utility model content
At the problem that present industrial control field multi-path digital amount input exists, the utility model provides a kind of multi-path digital amount input circuit based on the Darlington transistor array, and circuit is simple, input current is little, thereby the reduction power consumption is dwindled the volume that uses device, reduces the PCB size.
The technical solution of the utility model is as follows:
A kind of multi-path digital amount input circuit based on the Darlington transistor array, comprise a darlington transistor array, each signal input part of described darlington transistor array be linked in sequence a stabilivolt and a diode connect a pull-up resistor between described stabilivolt and the diode; Each signal output part of described darlington transistor array connects a pull-up resistor and a drop-down electric capacity respectively.
Its further technical scheme is: described darlington transistor array comprises 7 Darlington transistor unit, can form 7 groups of corresponding signal input parts and signal output part at the most.
And its further technical scheme is: the voltage stabilizing value of described stabilivolt is 6.2V, and the base voltage of Darlington transistor is 1V in the described darlington transistor array, and the pressure drop of described diode is 1V.
Useful technique effect of the present utility model is:
The utility model can drive seven groups of digital quantity input signals simultaneously, have input current little (about 1mA), temperature range is wide, current gain is high, driving force is strong, low in energy consumption, characteristics such as overall volume is little, time delay is little, is applicable to the industry control PLC system of each generic request high-speed high-power.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
As shown in Figure 1, main body of the present utility model is a darlington transistor array U1.Darlington transistor (Darlington Transistor) claim complex pipe again, adopt compound connected mode, with two suitable linking together of triode, to form the new triode of an equivalence, the enlargement factor of this equivalence triode is the product of two triode enlargement factors.Darlington transistor array U1 in the present embodiment adopts high withstand voltage, big electric current Darlington IC-ULN2003L, ULN2003L is high withstand voltage, big electric current Darlington array, it is made up of seven silicon NPN Darlingtons, has the ability that drives seven groups of loads simultaneously.
As shown in Figure 1, the pin 1 ~ 7 of darlington transistor array ULN2003L is a pulse signal input terminal.These 7 signal input part pins are inserted in 7 groups of digital quantity input signals (INPUT) stabilivolt (one of ZD1 ~ ZD7) and a diode (one of D1 ~ D7) back that is linked in sequence respectively.It is IN4148 that diode D1 ~ D7 in the present embodiment selects model for use.The pull-up resistor (one of R1 ~ R7) that it is 22K that each group mutually is connected with a resistance between the stabilivolt of series connection and the diode, on to draw voltage be 24V.
As shown in Figure 1, the pin 10 ~ 16 of darlington transistor array ULN2003L is pulse signal output end (OUTPUT), is used to connect load.Pin 10 corresponding pins 7 wherein; Pin 11 corresponding pins 6; Pin 12 corresponding pins 5; Pin 13 corresponding pins 4; Pin 14 corresponding pins 3; Pin 15 corresponding pins 2; Pin 16 corresponding pins 1.These 7 signal output part pins connect a pull-up resistor (one of R8 ~ R14) and drop-down electric capacity (C1 ~ C7) respectively.The value of pull-up resistor R8 ~ R14 is 1K, and the value of drop-down capacitor C 1 ~ C7 is 10nF.
As shown in Figure 1, darlington transistor array ULN2003L pin 8 ground connection.Pin 9 is common ports of inner 7 fly-wheel diode negative poles, and the positive pole of each diode connects the collector of each Darlington transistor respectively.When being used for inductive load, this pin connects load power source, realizes the afterflow effect.
In the present embodiment, the voltage stabilizing value of stabilivolt ZD1 ~ ZD7 is 6.2V, and the base voltage Vbe of Darlington transistor is 1V, and diode 4148 pressure drops are 1V, and as external input terminals, the highest effective voltage of then outside input is 6.2+1+1=8.2V with the base stage of Darlington transistor.When external input voltage less than 8.2V time input effectively, outside when not having input or voltage greater than 8.2V input invalid; Output terminal produces different level with the switching characteristic of utilizing Darlington transistor.
Above-described only is preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that other improvement and variation that those skilled in the art directly derive or associate under the prerequisite that does not break away from spirit of the present utility model and design, all should think to be included within the protection domain of the present utility model.
Claims (3)
1. multi-path digital amount input circuit based on the Darlington transistor array, it is characterized in that: comprise a darlington transistor array, each signal input part of described darlington transistor array be linked in sequence a stabilivolt and a diode connect a pull-up resistor between described stabilivolt and the diode; Each signal output part of described darlington transistor array connects a pull-up resistor and a drop-down electric capacity respectively.
2. according to the described multi-path digital amount input circuit based on the Darlington transistor array of claim 1, it is characterized in that: described darlington transistor array comprises 7 Darlington transistor unit, can form 7 groups of corresponding signal input parts and signal output part at the most.
3. according to claim 1 or 2 described multi-path digital amount input circuits based on the Darlington transistor array, it is characterized in that: the voltage stabilizing value of described stabilivolt is 6.2V, the base voltage of Darlington transistor is 1V in the described darlington transistor array, and the pressure drop of described diode is 1V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201607738U CN202083932U (en) | 2011-05-19 | 2011-05-19 | Multipath digital quantity input circuit based on Darlington transistor array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201607738U CN202083932U (en) | 2011-05-19 | 2011-05-19 | Multipath digital quantity input circuit based on Darlington transistor array |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202083932U true CN202083932U (en) | 2011-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201607738U Expired - Fee Related CN202083932U (en) | 2011-05-19 | 2011-05-19 | Multipath digital quantity input circuit based on Darlington transistor array |
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| CN (1) | CN202083932U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107066414A (en) * | 2017-04-25 | 2017-08-18 | 南京国电南自维美德自动化有限公司 | A kind of enhanced parallel communications circuit and method |
| CN110531256A (en) * | 2019-07-26 | 2019-12-03 | 大连理工大学 | A kind of darlington array simulation electromagnetic relay switch amount output system |
| CN113253645A (en) * | 2021-05-12 | 2021-08-13 | 北京铁科时代科技有限公司 | Digital input/output module for rail train |
-
2011
- 2011-05-19 CN CN2011201607738U patent/CN202083932U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107066414A (en) * | 2017-04-25 | 2017-08-18 | 南京国电南自维美德自动化有限公司 | A kind of enhanced parallel communications circuit and method |
| CN107066414B (en) * | 2017-04-25 | 2023-12-29 | 南京国电南自维美德自动化有限公司 | Enhanced parallel communication circuit and method |
| CN110531256A (en) * | 2019-07-26 | 2019-12-03 | 大连理工大学 | A kind of darlington array simulation electromagnetic relay switch amount output system |
| CN113253645A (en) * | 2021-05-12 | 2021-08-13 | 北京铁科时代科技有限公司 | Digital input/output module for rail train |
| CN113253645B (en) * | 2021-05-12 | 2022-07-15 | 北京铁科时代科技有限公司 | Digital input/output module for rail train |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111221 Termination date: 20170519 |
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| CF01 | Termination of patent right due to non-payment of annual fee |