CN210327536U - Isolated multi-protection discrete magnitude output circuit - Google Patents
Isolated multi-protection discrete magnitude output circuit Download PDFInfo
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- CN210327536U CN210327536U CN201921504213.2U CN201921504213U CN210327536U CN 210327536 U CN210327536 U CN 210327536U CN 201921504213 U CN201921504213 U CN 201921504213U CN 210327536 U CN210327536 U CN 210327536U
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Abstract
The utility model belongs to the technical field of the airborne computer interface, concretely relates to many protections of isolated form discrete magnitude output circuit, it includes a plurality of output unit, every the output unit includes: a solid state relay; the input end of the solid-state relay is connected with an internal power supply of the airborne equipment, one path of the output end of the solid-state relay is connected with an aircraft power supply, and the other path of the output end of the solid-state relay is led out outwards. The utility model provides a many protections of isolated form volume output circuit that disperses, it both kept apart the high pressure of discrete signal and output low pressure and have the current-limiting again, discharge the electromotive force, prevent protect function such as reverse, improved reliability and security that machine carried electronic equipment.
Description
Technical Field
The utility model belongs to the technical field of the machine carries computer interface, concretely relates to many protections of isolated form quantity output circuit that disperses.
Background
With the vigorous development of the domestic aviation industry, the whole airplane enters the full-electric era, the use of airborne electronic equipment is more and more extensive, and key signals among all system electronic equipment are transmitted by discrete quantity signals generated by a 28V power supply on the airplane. The 28V \ open circuit signal is a discrete quantity signal commonly used by airborne electronic equipment, has higher transmission distance and anti-interference capability, and is widely applied.
The 28V \ open circuit state output signal is controlled by a certain controller to be output or disconnected, one end of the 28V \ open circuit state output signal is connected with the 28V of the airplane, and the other end of the 28V \ open circuit state output signal is led out by a connecting cable to form a discrete output signal. Because the 28V power supply on the machine is used as the output, only a small transmission current is needed, the long-distance transmission can be realized, the signal amplitude is high, and the anti-interference capability is excellent, but the following problems are faced:
1. the output must use the 28V "high" level of the aircraft to meet the interference rejection capability. However, the power supply voltage in the control end equipment is low and is only 5V, and direct control output has a great overvoltage risk, which can damage an internal circuit and needs electrical isolation;
2. the load driven by the output 28V level may have an abnormal condition such as a short circuit or a back electromotive force, which may cause permanent damage to the circuit or reduce reliability, and thus, a protection measure must be added.
In order to solve the problem, the utility model discloses an isolated form many protections volume output circuit that disperses.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages which will be described later.
The utility model discloses it is still another purpose to provide a many protections of isolated form volume output circuit that disperses, its high pressure and the output low pressure that has both kept apart discrete signal have the current-limiting again, discharge the electromotive force, prevent protection function such as reverse, improved reliability and security that machine carried electronic equipment.
To achieve these objects and other advantages in accordance with the purpose of the invention, the present invention provides an isolated multi-protection discrete magnitude output circuit, which includes a plurality of output units, each of the output units including:
a solid state relay;
the input end of the solid-state relay is connected with an internal power supply of the airborne equipment, one path of the output end of the solid-state relay is connected with an aircraft power supply, and the other path of the output end of the solid-state relay is led out outwards.
The utility model provides an output circuit has realized the high pressure of discrete magnitude signal and the isolation of output end circuit voltage, has protected the internal circuit, has realized reliability and the security of the on-board equipment power consumption on the aircraft.
Preferably, the solid-state relay further comprises a level driver, and the level driver is connected with the input end of the solid-state relay.
The high-low voltage that level driver provided has certain driving capability, and the driving capability can make solid state relay open and close to control whole output circuit.
Preferably, the on-board relay further comprises a resistor R1, one end of the resistor R1 is connected with an internal power supply of the on-board device, and the other end of the resistor R1 is connected with an input end of the solid-state relay.
The resistor R1 is a resistor for limiting the current to prevent the current from flowing from the internal power supply of the on-board device to the light emitting diode of the solid-state relay N1, which is damaged due to excessive current.
Preferably, the aircraft power supply further comprises a resistor R2, one end of the resistor R2 is connected with the aircraft power supply, and the other end of the resistor R2 is connected with the output end of the solid-state relay.
The resistor R2 is used for preventing the aircraft power supply from passing through the photosensitive field effect transistor of the solid-state relay N1, so that the current is prevented from being excessively large, damage is caused, and current limiting is carried out.
Preferably, the method further comprises the following steps:
one end of the diode V1 is connected with the output end of the solid-state relay, and the other end of the diode V1 is led out outwards;
a diode V2, one end of the diode V2 being connected to one end of the diode V1, the other end of the diode V2 being connected to the ground of the aircraft power supply.
The function of the through diode V1 is to prevent the back pressure generated in the abnormal state from damaging the solid-state relay N1 and to achieve electrical isolation when multiple channels are simultaneously output (when multiple output units are simultaneously operated). The diode V2 functions to prevent the output channel turn-off transient from generating a very high back emf to damage the circuitry by reverse conduction to the ground of the aircraft power supply when the external load is a solenoid.
Preferably, the solid state relay selects TLP 3419.
Preferably, the level driver selects SN74LVC8T 245.
Preferably, the diode V1 and the diode V2 are each selected from BAS 21H.
Preferably, the aircraft power supply is 28V.
The utility model discloses at least, include following beneficial effect:
1. the utility model provides a pair of many protections of isolated form volume output circuit that disperses, it has realized the high pressure of volume signal that disperses and the isolation of output circuit low pressure, has protected the internal circuit.
2. The utility model provides a pair of many protections of isolated form volume output circuit that disperses, its circuit structure is simple, and is with low costs, has market competition, facilitate promotion.
3. The utility model provides a pair of many protections of isolated form volume output circuit that disperses, the diode of its adoption both prevented that the back pressure that forms under the abnormal condition from puncturing the emitting diode in the optoelectronic coupler, realized electric isolation again when the multichannel is gathered simultaneously.
4. The utility model provides a pair of many protections of isolated form volume output circuit that disperses, it has and prevents to overflow, and the electromotive force of releasing prevents functions such as reverse, has improved airborne electronic equipment's reliability and security.
Drawings
Fig. 1 is a schematic circuit diagram of an output unit of an isolated multi-protection discrete magnitude output circuit according to the present invention;
fig. 2 is a schematic diagram of an isolated multi-protection discrete magnitude output circuit according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
In the present specification, when an element is referred to as being "connected to" or coupled to "or" disposed in "another element, it may be" directly connected to "or coupled to" or "directly disposed in" the other element. Or be connected or coupled to or disposed in another element with other elements interposed therebetween, unless it is volumetrically "directly coupled or connected to" or "directly disposed in" the other element. Further, it will be understood that when an element is referred to as being "on," "over," "under" or "under" another element, it can be "in direct" contact with the other element or in contact with the other element interposed therebetween, unless it is referred to as being in direct contact with the other element.
The utility model provides a N1 is solid state relay, and D1 is the level driver.
The utility model provides a many protections of isolated form discrete magnitude output circuit, including a plurality of output unit, as shown in FIG. 1, every the output unit includes:
a solid state relay D1;
the input end of the solid-state relay is connected with an internal power supply of the airborne equipment, one path of the output end of the solid-state relay is connected with an aircraft power supply, the other path of the output end of the solid-state relay is led out externally, namely, an output interface of the discrete magnitude signal is obtained, and the discrete magnitude signal can be 28V/on discrete magnitude signal.
The utility model discloses a high pressure and the isolation of output circuit low pressure of discrete magnitude signal have protected the internal circuit, have protected the operation of internal circuit, and have improved the stability of circuit.
In the basic mountain of the above embodiment, the system further includes a level driver D1, the level driver D1 is connected to the input terminal of the solid-state relay N1, the input terminal of the solid-state relay is divided into two paths, one path is connected to the output pin of the level driver D1, and the other path is connected to +5V of the onboard device internal power supply.
The high-low voltage that level driver provided has certain driving capability, and the driving capability can make solid state relay open and close to control whole output circuit.
On the basis of the above embodiment, the on-board relay further comprises a resistor R1, one end of the resistor R1 is connected with an internal power supply of the on-board device, and the other end of the resistor R1 is connected with an input end of the solid-state relay.
The resistor R1 is positioned between the solid-state relay N1 and an on-board equipment internal power supply, namely one end of the resistor R1 is connected with +5V of the on-board equipment internal power supply, and the other end of the resistor R1 is connected with the positive end of the input end of the solid-state relay;
the resistor R1 is used for preventing the damage caused by excessive current of the +5V power supply inside the airborne equipment to the light emitting diode of the solid-state relay N1, so that the resistor with the resistance value of 200 omega and the precision of 1% is selected for current limiting.
On the basis of the above embodiment, the aircraft power supply further includes a resistor R2, one end of the resistor R2 is connected to the aircraft power supply, and the other end of the resistor R2 is connected to the output end of the solid-state relay.
The resistor R2 is located between the solid state relay and the aircraft power supply, i.e. one end of the resistor R2 is connected to the aircraft power supply and the other end of the resistor R2 is connected to the positive terminal of the output of the relay. R2 is used for preventing the damage caused by the overlarge current of the photosensitive field effect transistor from passing through +28V to the solid-state relay N1, so that the resistor with the resistance value of 100 omega, the precision of 1 percent and the rated power of 2W is selected for current limiting.
On the basis of the above embodiment, the method specifically further includes:
one end of the diode V1 is connected with the output end of the solid-state relay, and the other end of the diode V1 is led out outwards;
a diode V2, one end of the diode V2 being connected to one end of the diode V1, the other end of the diode V2 being connected to the ground of the aircraft power supply. The function of the through diode V1 is to prevent the back pressure generated in the abnormal state from damaging the solid-state relay N1, as shown in fig. 2, and to achieve electrical isolation when multiple channels are simultaneously output (when multiple output units are simultaneously operated). The diode V2 functions to prevent the output channel turn-off transient from generating a very high back emf to damage the circuitry by conducting to 28VGND in the reverse direction when the external load is a solenoid.
Specifically, the solid-state relay selection TLP3419, the level driver selection SN74LVC8T245, the diode V1 and the diode V2 both select BAS 21H.
The utility model discloses a theory of operation uses aircraft power to explain for 28V as the example:
when the output pin of the level driver D1 outputs '0', the voltage on the pin is about 0.2V, the voltage drop of the light emitting diode in the control end of the solid-state relay N1 is approximately equal to 4.8V, the solid-state relay is in a conducting state, and the current is greater than 3mA, so that the positive end and the negative end of the output end of the solid-state relay N1 are connected, and the negative end outputs '28V' level;
when the output pin of the level driver D1 outputs "1", the voltage on the pin is about 5.0V, so that the voltage drop on the internal light emitting diode of the solid-state relay is very low, which is approximately 0V, and the conduction condition is not satisfied, so the positive and negative terminals of the output terminal of the solid-state relay N1 are in the off state, and the negative terminal outputs "open circuit".
The utility model provides a 28V opens a way discrete volume state output circuit based on solid state relay, current-limiting resistance, through-flow diode, both kept apart discrete signal's high pressure and output low pressure, have the current-limiting again, discharge the trend, prevent protection function such as reverse, improved airborne electronic equipment's reliability and security.
Additionally, the utility model provides a resistance R1 and R2's numerical value can change according to the actual application condition to reach and solve the utility model provides a technical problem.
It is obvious that those skilled in the art can obtain various effects not directly mentioned according to the respective embodiments without trouble from various structures according to the embodiments of the present invention.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the applications listed in the specification and the examples. It can be applicable to various and be fit for the utility model discloses a field completely. Additional modifications will readily occur to those skilled in the art. The invention is therefore not to be limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.
Claims (9)
1. An isolated multi-protection discrete magnitude output circuit, comprising a plurality of output units, each of the output units comprising:
a solid state relay;
the input end of the solid-state relay is connected with an internal power supply of the airborne equipment, one path of the output end of the solid-state relay is connected with an aircraft power supply, and the other path of the output end of the solid-state relay is led out outwards.
2. The isolated multi-protection discrete magnitude output circuit of claim 1, further comprising a level driver connected to an input of the solid state relay.
3. The isolated multi-protection discrete magnitude output circuit of claim 1, further comprising a resistor R1, wherein one end of the resistor R1 is connected to an internal power supply of the on-board device, and the other end of the resistor R1 is connected to an input terminal of the solid-state relay.
4. The isolated multi-protection discrete magnitude output circuit of claim 1, further comprising a resistor R2, wherein one end of the resistor R2 is connected to the aircraft power supply, and the other end of the resistor R2 is connected to the output terminal of the solid-state relay.
5. The isolated multi-protection discrete magnitude output circuit of claim 1, further comprising:
one end of the diode V1 is connected with the output end of the solid-state relay, and the other end of the diode V1 is led out outwards;
a diode V2, one end of the diode V2 being connected to one end of the diode V1, the other end of the diode V2 being connected to the ground of the aircraft power supply.
6. The isolated multi-protection discrete magnitude output circuit of claim 1, wherein the solid state relay selects the TLP 3419.
7. The isolated multi-protection discrete magnitude output circuit of claim 2, wherein the level driver selects SN74LVC8T 245.
8. The isolated multi-protection discrete magnitude output circuit of claim 5, wherein the diode V1 and the diode V2 both select BAS 21H.
9. The isolated multi-protection discrete magnitude output circuit of any one of claims 1 to 8, wherein the aircraft power supply is 28V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921504213.2U CN210327536U (en) | 2019-09-10 | 2019-09-10 | Isolated multi-protection discrete magnitude output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921504213.2U CN210327536U (en) | 2019-09-10 | 2019-09-10 | Isolated multi-protection discrete magnitude output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210327536U true CN210327536U (en) | 2020-04-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921504213.2U Active CN210327536U (en) | 2019-09-10 | 2019-09-10 | Isolated multi-protection discrete magnitude output circuit |
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| Country | Link |
|---|---|
| CN (1) | CN210327536U (en) |
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2019
- 2019-09-10 CN CN201921504213.2U patent/CN210327536U/en active Active
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