CN202025033U - Bidirectional input/output interface circuit - Google Patents
Bidirectional input/output interface circuit Download PDFInfo
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- CN202025033U CN202025033U CN2011200103724U CN201120010372U CN202025033U CN 202025033 U CN202025033 U CN 202025033U CN 2011200103724 U CN2011200103724 U CN 2011200103724U CN 201120010372 U CN201120010372 U CN 201120010372U CN 202025033 U CN202025033 U CN 202025033U
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Abstract
The utility model discloses a bidirectional input/output interface circuit which can realize the input/output of '28V ground/suspend in air' discrete magnitude signals by isolating resistors R1, R2, and R3, an OC output driver U0 and optocouplers U1 and U2, can realize the input/output of '28V/suspend in air' discrete magnitude signals by isolating resistors R4, R5, and R6, an OC output inverter N1, an inverter N2, and optocouplers U3 and U4, and can realize the input/output of '28V/ground' discrete magnitude signals by isolating resistors R7, R8, R9 and R10, an OC output inverter N3, an inverter N4, and optocouplers U5 and U6. The interface circuit is simple, compact and reasonable in structure, and fast in input/output speed, can meet the requirements of electrical isolation, can complete self-checking of circuits, and can be used as an input or output interface.
Description
Technical field
The present invention relates to a kind of input/output interface (Input/Output Port, I/O mouth) circuit, especially have photoelectricity isolation features and self-checking function.
Background technology
In modern avionics system, 28V discrete magnitude signal generally has " 28V ground/unsettled, unsettled, the 28V/ ground of 28V/ " three kinds of forms.In order to finish the test of avionics system discrete magnitude signal, must provide the test channel of respective type to tested avionics system, i.e. the input/output interface circuit.In the design process of complicated aviation electronics test macro; because a variety of causes such as test channel is many, signal type complexity; occur the I/O direction of 28V discrete magnitude test channel is done anti-situation through regular meeting; like this in the process of aviation electronics test macro debugging; the I/O direction that needs the corresponding discrete magnitude passage of change; system lacks dirigibility, can cause the testing hardware wasting of resources.In addition, the existing two-way input/output interface of discrete magnitude all adopts logical device formations such as Sheffer stroke gate, and owing to current logical devices such as Sheffer stroke gate all are operated under the 5V voltage, so sort circuit mainly is+the 5V discrete magnitude, can not be applied to+the 28V discrete magnitude, and sort circuit does not have the electrical isolation function.
Summary of the invention
In order to overcome the shortcoming that prior art I/O direction can not flexibility and changeability, the invention provides a kind of two-way input/output interface circuit, can finish the change of 28V discrete magnitude signal I/O direction by the setting of control bit, the circuit by the method design has electrical isolation function and self-checking function simultaneously.
The technical solution adopted for the present invention to solve the technical problems is as follows.
" 28V ground/unsettled " input/output interface circuit elements device annexation is as follows: one termination of the first isolation resistance R1+5V power supply, another termination second optocoupler U2 diode cathode; One termination of the second isolation resistance R2+5V power supply, another termination first optocoupler U1 photosensitive tube collector; One termination of the 3rd isolation resistance R3+28V power supply, another termination first optocoupler U1 diode cathode; The first optocoupler U1 photosensitive tube emitter connects+5V power supply ground G5; The second optocoupler U2 photosensitive tube emitter connects+28V power supply ground G28; The input end IN1 of acquisition controlling interface circuit connects the first optocoupler U1 photosensitive tube collector; The output terminal of acquisition controlling interface circuit/input control bit OUT1 connects the second optocoupler U2 diode cathode through OC output driver U0; The I/O end IN_OUT1 of test interface circuit connects the first optocoupler U1 diode cathode and the second optocoupler U2 photosensitive tube collector.When this circuit during as input interface, at first need output terminal/input control bit OUT1 is changed to high level " 1 ", this moment, the state (" 0 " or " 1 ") of input end IN1 was the state (28V ground/unsettled) of IN_OUT1; When this circuit during as output interface, the state of IN_OUT1 (28V ground/unsettled) is the state (" 0 " or " 1 ") of OUT1; When carrying out self check, OU1 is changed to low level " 0 ", if the IN1 state is low level " 0 ", indication circuit is working properly, otherwise has fault.
" 28V/ is unsettled " input/output interface circuit elements device annexation is as follows: one termination of the 4th isolation resistance R4+5V power supply, another termination the 4th optocoupler U4 photosensitive tube collector; One termination of the 5th isolation resistance R5+5V power supply, another termination the 3rd optocoupler U3 diode cathode; The negative pole of a termination the 4th optocoupler diode of the 6th isolation resistance R6, another termination+28V power supply ground G28; The 3rd optocoupler U3 photosensitive tube collector connects+the 28V power supply; The 4th optocoupler U4 photosensitive tube emitter connects+the ground G5 of 5V power supply; The input end IN2 of acquisition controlling interface circuit connects the 4th optocoupler U4 photosensitive tube collector by phase inverter N2; The output terminal of acquisition controlling interface circuit/input control bit OUT2 connects the 3rd optocoupler U3 diode cathode by OC output phase inverter N1; The I/O end IN_OUT2 of test interface circuit connects the emitter and the 4th optocoupler U4 diode cathode of the 3rd optocoupler U3 photosensitive tube.When this circuit during as input interface, at first need OUT2 is changed to low level " 0 ", this moment input end IN2 the state (28V/ is unsettled) of the corresponding IN_OUT2 of state (" 1 " or " 0 "); When this circuit during as output interface, the state of the corresponding OUT2 of the state of IN_OUT2 (28V/ is unsettled) (" 1 " or " 0 "); When carrying out self check, OUT2 is changed to high level " 1 ", if the IN2 state is high level " 1 ", indication circuit is working properly, otherwise has fault.
" 28V/ ground " input/output interface circuit elements device annexation is as follows: one termination of the 7th isolation resistance R7+5V power supply, another termination the 6th optocoupler U6 photosensitive tube collector; One termination of the 8th isolation resistance R8+5V power supply, another termination the 5th optocoupler U5 diode cathode; The negative pole of a termination the 6th optocoupler diode of the 9th isolation resistance R9, another termination+28V power supply ground G28; The 5th optocoupler U5 photosensitive tube collector connects+the 28V power supply; The 6th optocoupler U6 photosensitive tube emitter connects+5V power supply ground G5; The input end IN3 of acquisition controlling interface circuit connects the 6th optocoupler U6 photosensitive tube collector by phase inverter N4; The output terminal of acquisition controlling interface circuit/input control bit OUT3 connects the 5th optocoupler U5 diode cathode by OC output phase inverter N3; The I/O end IN_OUT3 of test interface circuit connects the emitter and the 6th optocoupler U6 diode cathode of the 5th optocoupler U5 photosensitive tube; R10 is a pull down resistor, one termination+28V power supply ground G28, the emitter of another termination the 5th optocoupler U5 photosensitive tube and the 6th optocoupler U6 diode cathode.When this circuit during as input interface, at first need OUT3 is changed to high level " 0 ", this moment input end IN3 the state (28V/ ground) of the corresponding IN_OUT3 of state (" 1 " or " 0 "); When this circuit during as output interface, the state (" 1 " or " 0 ") of the corresponding OUT3 of the state of IN_OUT3 (28V/ ground).When carrying out self check, OUT3 is changed to high level " 1 ", if the IN3 state is high level " 1 ", indication circuit is working properly, otherwise has fault.
The invention has the beneficial effects as follows: the circuit structure of the present invention's design is simple, compact, reasonable; By adopting optocoupler to finish the I/O of the various states of 28V discrete magnitude signal, fast with respect to relay I/O speed, and can satisfy the electrical isolation demand of aviation electronics test macro; Can finish the circuit self check; Especially the present invention can be used as the input interface or the output interface of 28V discrete magnitude signal by the difference of control bit setting in the circuit.
Description of drawings
Fig. 1 is " 28V ground/unsettled " input/output interface circuit elements device principle figure.
Fig. 2 is " 28V/ is unsettled " input/output interface circuit elements device principle figure.
Fig. 3 is " 28V/ ground " input/output interface circuit elements device principle figure.
Embodiment
Embodiment among following the present invention in conjunction with the accompanying drawings is described further.
The present invention is mainly by isolation resistance R1, R2, R3, and OC output driver U0 and optocoupler U1, U2 realize finishing the I/O of " 28V ground/unsettled " discrete magnitude signal; By isolation resistance R4, R5, R6, OC output phase inverter N1, phase inverter N2 and optocoupler U3, U4 realize the I/O of " 28V/ is unsettled " discrete magnitude signal; By isolation resistance R7, R8, R9, R10, OC output phase inverter N3, phase inverter N4 and optocoupler U5, U6 realize the I/O of " 28V/ ground " discrete magnitude signal.
In an embodiment, optocoupler adopts TLP521-2; Isolation resistance R2, R4, R7 resistance adopt 4.7k Ω, power 0.125W; Isolation resistance R1, R3, R5, R6, R8, R9 resistance adopt 5.1k Ω, power 0.25W; Pull down resistor R10 resistance adopts 10k Ω, power 0.125W.
" 28V ground/unsettled " input/output interface circuit elements device principle such as Fig. 1.The first isolation resistance R1 is the cathode power supply resistance of the second optocoupler U2 diode, one termination+5V power supply, another termination second optocoupler U2 diode cathode; The second isolation resistance R2 is the source resistance of the first optocoupler U1 photosensitive tube, one termination+5V power supply, another termination first optocoupler U1 photosensitive tube collector; The 3rd isolation resistance R3 is the source resistance of the first optocoupler U1 diode, one termination+28V power supply, another termination first optocoupler U1 diode cathode; The first optocoupler U1 photosensitive tube emitter connects+5V power supply ground G5; The second optocoupler U2 photosensitive tube emitter connects+28V power supply ground G28; The input end IN1 of acquisition controlling interface circuit connects the first optocoupler U1 photosensitive tube collector; The output terminal of acquisition controlling interface circuit/input control bit OUT1 connects the second optocoupler U2 diode cathode through OC output driver U0; The I/O end IN_OUT1 of test interface circuit connects the first optocoupler U1 diode cathode and the second optocoupler U2 photosensitive tube collector.When this circuit during as input interface, needing that at first output terminal/input control bit OUT1 is changed to high level " 1 " ends the second optocoupler U2, when if IN_OUT1 is " 28V ground ", the first optocoupler U1 led lighting, the U1 photosensitive tube has electric current to pass through, make very low level " 0 " of the first optocoupler U1 photosensitive tube current collection, promptly IN1 is " 0 "; When if IN_OUT1 is " unsettled ", the first optocoupler U1 diode is not luminous, and the U1 photosensitive tube does not have electric current to pass through, and makes very high level " 1 " of the first optocoupler U1 photosensitive tube current collection, and promptly IN1 is " 1 ".When this circuit during as output interface, if when OUT1 is " 0 ", the second optocoupler U2 led lighting, the U2 photosensitive tube has electric current to pass through, and makes very low level " 28V ground " of the second optocoupler U2 photosensitive tube current collection, and promptly IN_OUT1 is " 28V ground "; When if OUT1 is " 1 ", the second optocoupler U2 diode is not luminous, and the U2 photosensitive tube does not have electric current to pass through, and makes the second optocoupler U2 photosensitive tube current collection very " unsettled ", and promptly IN_OUT1 is " unsettled ".When this circuit carries out self check, OUT1 is changed to low level " 0 ", the second optocoupler U2 led lighting, the U2 photosensitive tube has electric current to pass through, and the second optocoupler U2 photosensitive tube current collection is low level very, make the first optocoupler U1 led lighting, the U1 photosensitive tube has electric current to pass through, and the first optocoupler U1 photosensitive tube current collection is low level very, and IN1 is low level " 0 ", indication circuit is working properly, otherwise has fault.
" 28V/ is unsettled " input/output interface circuit elements device principle such as Fig. 2.The 4th isolation resistance R4 is the source resistance of the 4th optocoupler U4 photosensitive tube collector, one termination+5V power supply, the input end of another termination the 4th optocoupler U4 photosensitive tube collector and phase inverter N2; The 5th isolation resistance R5 is the source resistance of the 3rd optocoupler U3 diode, one termination+5V power supply, another termination second optocoupler U2 diode cathode; The 6th isolation resistance R6 is the stake resistance of the 4th optocoupler U4 diode, a termination the 4th optocoupler diode cathode, another termination 28V power supply ground G28; The 3rd optocoupler U3 photosensitive tube collector connects+the 28V power supply; The 4th optocoupler U4 photosensitive tube emitter connects+5V power supply ground G5; The input end IN2 of acquisition controlling interface circuit connects the output terminal of phase inverter N2; The output terminal of acquisition controlling interface circuit/input control bit OUT2 connects the input end of OC output phase inverter N1, output termination the 3rd optocoupler U3 diode cathode of N1; The I/O end IN_OUT2 of test interface circuit connects the 3rd optocoupler U3 photosensitive tube emitter and the 4th optocoupler U4 diode cathode.When this circuit during as input interface, at first need output terminal/input control bit OUT2 is changed to low level " 0 ", N1 output high level " 1 " then, the 3rd optocoupler U3 ends; When if IN_OUT2 is " 28V ", the 4th optocoupler U4 led lighting, the U4 photosensitive tube has electric current to pass through, and makes very low level " 0 " of the 4th optocoupler U4 photosensitive tube current collection, and after phase inverter N2 output, IN2 is " 1 "; When if IN_OUT2 is " unsettled ", the 4th optocoupler U4 diode is not luminous, and the U4 photosensitive tube does not have electric current to pass through, and makes very high level " 1 " of the 4th optocoupler U4 photosensitive tube current collection, and after phase inverter N2 output, IN2 is " 0 ".When this circuit during as output interface, if when OUT2 is " 1 ", OC exports phase inverter N1 output low level " 0 ", the 3rd optocoupler U3 led lighting, the U3 photosensitive tube has electric current to pass through, and makes the 3rd optocoupler U3 photosensitive tube launch very high level " 28V ", and promptly IN_OUT2 is " 28V "; When if OUT2 is " 0 ", OC output phase inverter N1 output high level " 1 ", the 3rd optocoupler U3 diode is not luminous, and the U3 photosensitive tube does not have electric current to pass through, and makes the 3rd optocoupler U3 photosensitive tube current collection very " unsettled ", and promptly IN_OUT2 is " unsettled ".When this circuit carries out self check, OUT2 is changed to high level " 1 ", and OC exports phase inverter N1 output low level " 0 ", the 3rd optocoupler U3 led lighting, the U3 photosensitive tube has electric current to pass through, make the 4th optocoupler U4 led lighting, the U4 photosensitive tube has electric current to pass through, and the 4th optocoupler U4 photosensitive tube current collection is low level very, after phase inverter N2 output, IN2 is high level " 1 ", and indication circuit is working properly, otherwise has fault.
" 28V/ ground " input/output interface circuit elements device principle such as Fig. 3.The 7th isolation resistance R7 is the source resistance of the 6th optocoupler U6 photosensitive tube collector, one termination+5V power supply, the input end of another termination the 6th optocoupler U6 photosensitive tube collector and phase inverter N4; The 8th isolation resistance R8 is the source resistance of the 5th optocoupler U5 diode, one termination+5V power supply, another termination the 5th optocoupler U5 diode cathode; The 9th isolation resistance R9 is the stake resistance of the 6th optocoupler U6 diode, a termination the 6th optocoupler diode cathode, another termination 28V power supply ground G28; The tenth isolation resistance R10 is the pull down resistor of output signal, a termination IN_OUT3, another termination 28V power supply ground G28; The 5th optocoupler U5 photosensitive tube collector connects+the 28V power supply; The 6th optocoupler U6 photosensitive tube emitter connects+5V power supply ground G5; The input end IN3 of acquisition controlling interface circuit connects the output terminal of phase inverter N4; The output terminal of acquisition controlling interface circuit/input control bit OUT3 connects the input end of OC output phase inverter N3, output termination the 5th optocoupler U5 diode cathode of N3; The I/O end IN_OUT3 of test interface circuit meets the 5th optocoupler U5 photosensitive tube emitter, the 6th optocoupler U6 diode cathode and the tenth isolation resistance R10.When this circuit during as input interface, at first need output terminal/input control bit OUT3 is changed to low level " 0 ", N3 output high level " 1 " then, the 5th optocoupler U5 ends; When if IN_OUT3 is " 28V ", the 6th optocoupler U6 led lighting, the U6 photosensitive tube has electric current to pass through, and makes very low level " 0 " of the 6th optocoupler U6 photosensitive tube current collection, and after phase inverter N4 output, IN3 is " 1 "; If IN_OUT3 be " " time, the 6th optocoupler U6 diode is not luminous, the U6 photosensitive tube does not have electric current to pass through, and makes very high level " 1 " of the 6th optocoupler U6 photosensitive tube current collection, after phase inverter N4 output, IN3 is " 0 ".When this circuit during as output interface, if when OUT3 is " 1 ", OC exports phase inverter N3 output low level " 0 ", the 5th optocoupler U5 led lighting, the U5 photosensitive tube has electric current to pass through, and makes the 5th optocoupler U5 photosensitive tube launch very high level " 28V ", and promptly IN_OUT3 is " 28V "; When if OUT3 is " 0 ", OC output phase inverter N3 output high level " 1 ", the 5th optocoupler U5 diode is not luminous, the U5 photosensitive tube does not have electric current to pass through, the 5th optocoupler U5 photosensitive tube collector by R10 is drop-down be " ", promptly IN_OUT3 be " ".When this circuit carries out self check, OUT3 is changed to high level " 1 ", and OC exports phase inverter N3 output low level " 0 ", the 5th optocoupler U5 led lighting, the U5 photosensitive tube has electric current to pass through, make the 6th optocoupler U6 led lighting, the U6 photosensitive tube has electric current to pass through, and the 6th optocoupler U6 photosensitive tube current collection is low level very, after phase inverter N4 output, IN3 is high level " 1 ", and indication circuit is working properly, otherwise has fault.
Claims (1)
1. two-way input/output interface circuit is characterized in that:
When it is applied to 28V ground/unsettled connection, one termination of first isolation resistance+5V power supply, another termination second optocoupler diode cathode, one termination of second isolation resistance+5V power supply, another termination first optocoupler photosensitive tube collector; One termination of the 3rd isolation resistance+28V power supply, another termination first optocoupler diode cathode; The first optocoupler photosensitive tube emitter connects+5V power supply ground; The second optocoupler photosensitive tube emitter connects+28V power supply ground; The input termination first optocoupler photosensitive tube collector of acquisition controlling interface circuit; The output terminal of acquisition controlling interface circuit/input control bit connects the second optocoupler diode cathode through the OC output driver; The I/O termination first optocoupler diode cathode of test interface circuit and the second optocoupler photosensitive tube collector;
When it is applied to the unsettled connection of 28V/, one termination of the 4th isolation resistance+5V power supply, another termination the 4th optocoupler photosensitive tube collector; One termination of the 5th isolation resistance+5V power supply, another termination the 3rd optocoupler diode cathode; The negative pole of one termination the 4th optocoupler diode of the 6th isolation resistance, another termination+28V power supply ground; The 3rd optocoupler photosensitive tube collector connects+the 28V power supply; The 4th optocoupler photosensitive tube emitter connects+ground of 5V power supply; The input end of acquisition controlling interface circuit connects the 4th optocoupler photosensitive tube collector by phase inverter; The output terminal of acquisition controlling interface circuit/input control bit connects the 3rd optocoupler diode cathode by OC output phase inverter; The emitter of I/O termination the 3rd optocoupler photosensitive tube of test interface circuit and the 4th optocoupler diode cathode;
When it is applied to the connection of 28V/ ground, one termination of the 7th isolation resistance+5V power supply, another termination the 6th optocoupler photosensitive tube collector; One termination of the 8th isolation resistance+5V power supply, another termination the 5th optocoupler diode cathode; The negative pole of one termination the 6th optocoupler diode of the 9th isolation resistance, another termination+28V power supply ground; The 5th optocoupler photosensitive tube collector connects+the 28V power supply; The 6th optocoupler photosensitive tube emitter connects+5V power supply ground; The input end of acquisition controlling interface circuit connects the 6th optocoupler photosensitive tube collector by phase inverter; The output terminal of acquisition controlling interface circuit/input control bit connects the 5th optocoupler diode cathode by OC output phase inverter; The emitter of I/O termination the 5th optocoupler photosensitive tube of test interface circuit and the 6th optocoupler diode cathode; Pull down resistor one termination+28V power supply ground, the emitter of another termination the 5th optocoupler photosensitive tube and the 6th optocoupler diode cathode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200103724U CN202025033U (en) | 2011-01-13 | 2011-01-13 | Bidirectional input/output interface circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200103724U CN202025033U (en) | 2011-01-13 | 2011-01-13 | Bidirectional input/output interface circuit |
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| CN202025033U true CN202025033U (en) | 2011-11-02 |
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| CN2011200103724U Expired - Lifetime CN202025033U (en) | 2011-01-13 | 2011-01-13 | Bidirectional input/output interface circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118154A (en) * | 2011-01-13 | 2011-07-06 | 西北工业大学 | Bilateral input/output port circuit |
| CN102497197A (en) * | 2011-12-28 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | Isolated bidirectional digital input output circuit |
| CN106533429A (en) * | 2015-09-11 | 2017-03-22 | 浙江绍兴苏泊尔生活电器有限公司 | strong and weak electric isolation device and electric appliance |
| CN116754931A (en) * | 2023-08-16 | 2023-09-15 | 新誉集团有限公司 | Self-checking method and self-checking circuit for digital input loop |
-
2011
- 2011-01-13 CN CN2011200103724U patent/CN202025033U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118154A (en) * | 2011-01-13 | 2011-07-06 | 西北工业大学 | Bilateral input/output port circuit |
| CN102497197A (en) * | 2011-12-28 | 2012-06-13 | 中冶南方（武汉）自动化有限公司 | Isolated bidirectional digital input output circuit |
| CN106533429A (en) * | 2015-09-11 | 2017-03-22 | 浙江绍兴苏泊尔生活电器有限公司 | strong and weak electric isolation device and electric appliance |
| CN106533429B (en) * | 2015-09-11 | 2023-08-22 | 浙江绍兴苏泊尔生活电器有限公司 | Strong and weak current isolating device and electrical apparatus |
| CN116754931A (en) * | 2023-08-16 | 2023-09-15 | 新誉集团有限公司 | Self-checking method and self-checking circuit for digital input loop |
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