CN210469267U - Isolated multi-protection discrete magnitude output circuit - Google Patents
Isolated multi-protection discrete magnitude output circuit Download PDFInfo
- Publication number
- CN210469267U CN210469267U CN201921508334.4U CN201921508334U CN210469267U CN 210469267 U CN210469267 U CN 210469267U CN 201921508334 U CN201921508334 U CN 201921508334U CN 210469267 U CN210469267 U CN 210469267U
- Authority
- CN
- China
- Prior art keywords
- solid
- state relay
- power supply
- output
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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 aircraft power supply comprises an input end of a solid-state relay, an aircraft power supply, an output end of the solid-state relay, an aircraft power supply, a ground connection terminal and a ground connection terminal, wherein the input end of the solid-state relay is connected with the internal power supply of an airborne device, one path of a positive end of the output end of the solid-state relay is connected with the aircraft power supply, the other path of the positive end of the output end of the solid-state relay. 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 aircraft power supply comprises an input end of a solid-state relay, an aircraft power supply, an output end of the solid-state relay, an aircraft power supply, a ground connection terminal and a ground connection terminal, wherein the input end of the solid-state relay is connected with the internal power supply of an airborne device, one path of a positive end of the output end of the solid-state relay is connected with the aircraft power supply, the other path of the positive end of the output end of the solid-state relay.
The utility model provides an output end circuit has realized the isolation of the high pressure of discrete signal and output end circuit low pressure, has protected the internal circuit, has improved the reliability and the security of machine-carried electronic equipment.
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 used for preventing the current limiting resistor from limiting the current caused by the fact that the current of an internal power supply of the on-board equipment is too large through the light emitting diode of the solid-state relay N1, and the current is damaged.
Preferably, the aircraft power supply further comprises a resistor R2, one end of the resistor R2 is connected with the positive end of the output end of the solid-state relay, the other end of the resistor R2 is divided into two paths, one path is connected with the aircraft power supply, and the other path is led out outwards.
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:
a diode V1, the negative terminal of the diode V1 is connected with the positive terminal of the output terminal of the solid-state relay through the resistor R2;
a diode V2, the positive terminal of the diode V2 being connected to the positive terminal of the diode V1, the negative terminal of the diode V2 being connected to the aircraft power supply.
Two paths of positive ends of the diode V1 are led out, one path is led out outwards, and the other path is connected with the positive end of the diode V2.
The function of the current diode V1 is to prevent output reversal and to achieve electrical isolation when multiple channels are output simultaneously (when multiple output units are operating simultaneously). Diode V2 functions to prevent the output channel turn-off transient from generating extremely high back emf to damage the circuitry by forward conduction to the aircraft power supply when the external load is a solenoid.
Preferably, the solid state relay selects TLP 3419.
Preferably, the level shifter 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 prevents to export backward and realizes electric isolation when the multichannel is gathered simultaneously, prevents again that output channel from turn-closing transient state from producing extremely high back electromotive force and damaging the circuit.
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, it includes a plurality of output unit, as shown in fig. 1, every output unit includes:
solid state relay N1;
wherein, the internal power supply of airborne equipment is connected to solid-state relay's input, the aircraft power supply is connected all the way of the positive end of solid-state relay's output, another way of the positive end of solid-state relay's output is outwards drawn, is the output interface of discrete magnitude signal promptly, discrete magnitude signal can be for 28 VGND/the discrete magnitude signal of opening a way, the negative terminal of solid-state relay's output is connected with aircraft power supply's ground.
The utility model provides an output end circuit has realized the isolation of the high pressure of discrete signal and output end circuit low pressure, has protected the internal circuit, has improved the reliability and the security of machine-carried electronic equipment.
On the basis of the above embodiment, specifically, the electronic device further includes a level driver D1, the level driver D1 is connected to the input end of the solid-state relay N1, the input end 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 located between the solid-state relay N1 and an on-board device internal power supply, namely one end of the resistor R1 is connected with +5V of the on-board device 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 current of the internal power supply +5V of the airborne equipment from passing through the LED of the solid-state relay N1 to be too large to cause damage, so that the resistor with the resistance value of 200 omega and the accuracy of 1% is selected for current limiting.
On the basis of the above embodiment, specifically, still include resistance R2, one end of resistance R2 with the positive end of the output of solid-state relay is connected, the other end of resistance R2 divides into two ways, one way with aircraft power is connected, another way is drawn forth to the outside.
The resistor R2 is positioned between the solid-state relay and the aircraft power supply and an external terminal, and the R2 is used for preventing the +28V from being damaged due to overlarge current passing through the photosensitive field effect transistor of the solid-state relay N1, so that the resistance value is 100 omega, and the precision is 1%.
On the basis of the above embodiment, the method further includes:
a diode V1, the negative terminal of the diode V1 is connected with the positive terminal of the output terminal of the solid-state relay through the resistor R2;
a diode V2, the positive terminal of the diode V2 being connected to the positive terminal of the diode V1, the negative terminal of the diode V2 being connected to the aircraft power supply.
Two paths of positive ends of the diode V1 are led out, one path is led out outwards, and the other path is connected with the positive end of the diode V2.
The function of the current diode V1 is to prevent the output from inverting, as shown in fig. 2, and to achieve electrical isolation when multiple channels are simultaneously output (when multiple output units are simultaneously operating). The diode V2 is used to prevent the output channel turn-off transient from generating extremely high back emf to damage the line by forward conduction to the aircraft power supply +28V when the external load is a solenoid.
The solid-state relay selection TLP3419, the level converter 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:
the positive end of the control end of the solid-state relay N1 is connected with the +5V of the onboard equipment internal power supply through a resistor R1; the negative terminal of the control terminal is connected with the output pin of the level driver D1. The negative end of the output end of the solid-state relay N1 is connected with +28VGND of the airplane; the positive terminal of the output terminal is connected with the negative terminal of the current-passing diode V1 through a resistor R2. Two paths of positive ends of the diode V1 are led out, one path is led out outwards, namely an output interface of the 28 VGND/open discrete magnitude signal, and the other path is connected with the positive end of the through-flow diode V2. The negative terminal of the diode V2 is connected to the +28V supply of the aircraft.
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 inside 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 '28 VGND' 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 across 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 invention provides a 28VGND \ open circuit discrete magnitude output circuit based on a solid state relay, a current limiting resistor and a through current diode, which not only isolates the high voltage of a discrete signal and the low voltage of an output end, but also has the protection functions of current limiting, discharge potential discharge, reverse prevention and the like, and improves the reliability and the safety of airborne electronic equipment.
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 aircraft power supply comprises an input end of a solid-state relay, an aircraft power supply, an output end of the solid-state relay, an aircraft power supply, a ground connection terminal and a ground connection terminal, wherein the input end of the solid-state relay is connected with the internal power supply of an airborne device, one path of a positive end of the output end of the solid-state relay is connected with the aircraft power supply, the other path of the positive end of the output end of the solid-state relay.
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 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.
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 positive end of the output end of the solid-state relay, and the other end of the resistor R2 is divided into two paths, one path is connected to the aircraft power supply, and the other path is led out.
5. The isolated multi-protection discrete magnitude output circuit of claim 4, further comprising:
a diode V1, the negative terminal of the diode V1 is connected with the positive terminal of the output terminal of the solid-state relay through the resistor R2;
a diode V2, the positive terminal of the diode V2 being connected to the positive terminal of the diode V1, the negative terminal of the diode V2 being connected to the aircraft power supply;
two paths of positive ends of the diode V1 are led out, one path is led out outwards, and the other path is connected with the positive end of the diode V2.
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 |
|---|---|---|---|
| CN201921508334.4U CN210469267U (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 |
|---|---|---|---|
| CN201921508334.4U CN210469267U (en) | 2019-09-10 | 2019-09-10 | Isolated multi-protection discrete magnitude output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210469267U true CN210469267U (en) | 2020-05-05 |
Family
ID=70432180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921508334.4U Active CN210469267U (en) | 2019-09-10 | 2019-09-10 | Isolated multi-protection discrete magnitude output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210469267U (en) |
-
2019
- 2019-09-10 CN CN201921508334.4U patent/CN210469267U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8018699B2 (en) | Over voltage protection for reduced level electrical signal interfaces | |
| CN103618285B (en) | A kind of overcurrent excess voltage protection for 4-20mA current input circuit | |
| CN110829361A (en) | Power output circuit with protection function | |
| WO2021252542A1 (en) | Protection circuit for battery management system | |
| US20220018885A1 (en) | Electrical control device detection circuit, detection method, and electric vehicle | |
| KR102186721B1 (en) | Overvoltage protection circuit in vehicle | |
| CN210863879U (en) | Isolated wide-range frequency acquisition circuit | |
| CN210469267U (en) | Isolated multi-protection discrete magnitude output circuit | |
| CN210327536U (en) | Isolated multi-protection discrete magnitude output circuit | |
| US7800249B1 (en) | Power supply system | |
| CN112510742A (en) | High voltage ride through module of energy storage system and control method thereof | |
| CN109449915B (en) | Circuit is protected in built-in miniaturization suitable for the power-up out of order of TR component | |
| CN110148986B (en) | Battery cell charge and discharge control module and battery cell protection device | |
| CN202977969U (en) | Efficient protection circuit of laser coupling power source | |
| CN110365322A (en) | A kind of digital output card | |
| CN211043467U (en) | Separate type band filtering discrete magnitude acquisition circuit | |
| CN104160602A (en) | Method for remote control of a power converter module and a device therefor | |
| CN218514083U (en) | IO port protection circuit | |
| CN107643816B (en) | Inverse logic negative terminal controlled reset lockout linkage circuit and reset control method | |
| CN219937940U (en) | Protective circuit | |
| CN216596001U (en) | Digital quantity input circuit and device | |
| KR20200046364A (en) | System and method for communication using low pass filter | |
| CN217956749U (en) | Switch control circuit, battery management system, battery pack and electric equipment | |
| CN203645295U (en) | Device and system for switch value output protection | |
| CN219394413U (en) | Communication link protection circuit and communication link |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |