CN203911448U - Short message gateway with short circuit protection - Google Patents
Short message gateway with short circuit protection Download PDFInfo
- Publication number
- CN203911448U CN203911448U CN201420310101.4U CN201420310101U CN203911448U CN 203911448 U CN203911448 U CN 203911448U CN 201420310101 U CN201420310101 U CN 201420310101U CN 203911448 U CN203911448 U CN 203911448U
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- field effect
- effect transistor
- short
- circuit protection
- diode
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Abstract
The utility model discloses a short message gateway with short circuit protection. The gateway comprises a power port, the power port is connected with a short circuit protection circuit, the short circuit protection circuit comprises a field effect transistor MOS1, the source electrode of the field effect transistor MOS1 is simultaneously connected with the power port and the cathode of a diode D1, the drain electrode of the field effect transistor is simultaneously connected with the source electrode of a field effect transistor MOS2 and the anode of a diode D2, the grid electrode of the field effect transistor MOS1 and the grid electrode of the field effect transistor MOS2 are simultaneously connected with the output end an operational amplifier, the grid electrode of the field effect transistor MOS1 is connected with the source electrode of a field effect transistor MOS3, the drain electrode of the field effect transistor MOS2 is connected to a power supply, the drain electrode of the field effect transistor MOS3 is connected to the ground via a resistor R1, the cathode of the diode D2 is connected with the anti-phase input end of the operational amplifier via a resistor R3, and the anode of the diode D1 is connected with the in-phase input end of the operational amplifier. The short message gateway has the advantages of the capability of short circuit protection.
Description
Technical field
The utility model relates to a kind of Short Message Service Gateway, relates in particular a kind of Short Message Service Gateway with short-circuit protection.
Background technology
Short Message Service Gateway full name is internet short message gateway, mainly for solving short message inter-communication between each network, each operator and the access problem of SP.It is the dynamic data switch providing for transmitting-receiving note.Cellphone subscriber increases, and short message service has become one of frequent business using of cellphone subscriber.Its Short Message Service Gateway is the visual plant of information interaction.Existing Short Message Service Gateway, power module is directly given note receiver module and SMS transmission module power supply.If power module goes wrong, will make Short Message Service Gateway in paralyzed state, will bring serious economic loss to Virtual network operator.
Utility model content
The utility model provides a kind of Short Message Service Gateway with short-circuit protection; it connects short-circuit protection circuit on power port, makes it no matter be to power supply short circuit or shorted to earth, does not all affect the normal work of Short Message Service Gateway; realize the short-circuit protection of safe level, protecting network operator's interests.
For solving above-mentioned technical problem, the utility model by the following technical solutions:
There is the Short Message Service Gateway of short-circuit protection, it comprises power port, on described power port, be connected with short-circuit protection circuit, described short-circuit protection circuit comprises field effect transistor MOS1 and field effect transistor MOS2, the source electrode of described field effect transistor MOS1 is connected on power port and drain electrode is connected with the anode of diode D2 with the source electrode of field effect transistor MOS2 simultaneously, the grid of the grid of described field effect transistor MOS1 and field effect transistor MOS2 is connected on the output of operational amplifier simultaneously, the grid of described field effect transistor MOS1 is connected on the source electrode of field effect transistor MOS3, the drain electrode of described field effect transistor MOS2 is connected on power supply, the drain electrode of described field effect transistor MOS3 is connected to the ground by resistance R 1, the negative electrode of described diode D2 is connected to by resistance R 3 on the inverting input of operational amplifier, the source electrode of described field effect transistor MOS1 is connected on the negative electrode of diode D1, the anodic bonding of described diode D1 is on the in-phase input end of operational amplifier.
Further technical scheme is:
As preferably, described field effect transistor MOS1, field effect transistor MOS2 and field effect transistor MOS3 are N-type field effect transistor.
Further, on the in-phase input end of described operational amplifier, be connected with earth resistance R2, in described resistance R 2, be parallel with electric capacity.
Compared with prior art, the beneficial effects of the utility model are:
The utility model connects short-circuit protection circuit on the power port of Short Message Service Gateway, makes Short Message Service Gateway no matter be to power supply short circuit or shorted to earth, all can normally work, and realizes the short-circuit protection of safe level, protecting network operator's interests.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the circuit diagram of short-circuit protection circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.Execution mode of the present utility model includes but not limited to the following example.
[embodiment]
The Short Message Service Gateway with short-circuit protection as shown in Figure 1, it comprises power port, on described power port, be connected with short-circuit protection circuit, described short-circuit protection circuit comprises field effect transistor MOS1 and field effect transistor MOS2, the source electrode of described field effect transistor MOS1 is connected on power port and drain electrode is connected with the anode of diode D2 with the source electrode of field effect transistor MOS2 simultaneously, the grid of the grid of described field effect transistor MOS1 and field effect transistor MOS2 is connected on the output of operational amplifier simultaneously, the grid of described field effect transistor MOS1 is connected on the source electrode of field effect transistor MOS3, the drain electrode of described field effect transistor MOS2 is connected on power supply, the drain electrode of described field effect transistor MOS3 is connected to the ground by resistance R 1, the negative electrode of described diode D2 is connected to by resistance R 3 on the inverting input of operational amplifier, the source electrode of described field effect transistor MOS1 is connected on the negative electrode of diode D1, the anodic bonding of described diode D1 is on the in-phase input end of operational amplifier.In the utility model, the grid of field effect transistor MOS3 is connected on the power port of Short Message Service Gateway.Field effect transistor MOS1 and field effect transistor MOS2 are for controlling the output of power supply, and the in-phase input end of operational amplifier is subject to the impact of power port voltage, and the current potential of inverting input is by the decision of indefinite voltage and divider resistance.Indefinite voltage is decided by drain voltage or the power port voltage of field effect transistor MOS2, and it equals magnitude of voltage larger in both.Operational amplifier forms a window comparator.If the magnitude of voltage of power port is outside the comparison value of window comparator, a low level of operational amplifier output, field effect transistor MOS1 and field effect transistor MOS2 are turn-offed, power port voltage cannot be entered, also prevent the overcurrent occurring because of shorted to earth, make Short Message Service Gateway avoid the problem that circuit is invaded and harassed.The circuit structure of short-circuit protection circuit is simply effective, and the interests of Virtual network operator are protected, and avoids the fault of Short Message Service Gateway to bring economic loss to Virtual network operator.
Described field effect transistor MOS1, field effect transistor MOS2 and field effect transistor MOS3 are N-type field effect transistor.
In order to make short-circuit protection circuit performance more stable, on the in-phase input end of described operational amplifier, be connected with earth resistance R2, in described resistance R 2, be parallel with electric capacity.Electric capacity can absorb spike, avoids interference the impact on circuit, and its reliability is strengthened.
In the present embodiment, as one group of preferred scheme, it is the resistance of 1 kilohm, 1 kilohm, 200 ohm that resistance R 1, resistance R 2, resistance R 3 can adopt resistance; Capacitor C can adopt the electric capacity of 100 μ F; It is the diode of IN5408, IN4001 that diode D1, diode D2 can adopt respectively model.Field effect transistor MOS1, field effect transistor MOS2 and field effect transistor MOS3 all adopt N-type field effect transistor.Operational amplifier can adopt CA3130.Through emulation, adopt the electronic device of above-mentioned specification, can make the best performance of circuit.
Be as mentioned above embodiment of the present utility model.The utility model is not limited to above-mentioned execution mode, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, within all falling into protection range of the present utility model.
Claims (3)
1. there is the Short Message Service Gateway of short-circuit protection, it comprises power port, it is characterized in that: on described power port, be connected with short-circuit protection circuit, described short-circuit protection circuit comprises field effect transistor MOS1 and field effect transistor MOS2, the source electrode of described field effect transistor MOS1 is connected on power port and drain electrode is connected with the anode of diode D2 with the source electrode of field effect transistor MOS2 simultaneously, the grid of the grid of described field effect transistor MOS1 and field effect transistor MOS2 is connected on the output of operational amplifier simultaneously, the grid of described field effect transistor MOS1 is connected on the source electrode of field effect transistor MOS3, the drain electrode of described field effect transistor MOS2 is connected on power supply, the drain electrode of described field effect transistor MOS3 is connected to the ground by resistance R 1, the negative electrode of described diode D2 is connected to by resistance R 3 on the inverting input of operational amplifier, the source electrode of described field effect transistor MOS1 is connected on the negative electrode of diode D1, the anodic bonding of described diode D1 is on the in-phase input end of operational amplifier.
2. the Short Message Service Gateway with short-circuit protection according to claim 1, is characterized in that: described field effect transistor MOS1, field effect transistor MOS2 and field effect transistor MOS3 are N-type field effect transistor.
3. the Short Message Service Gateway with short-circuit protection according to claim 1 and 2, is characterized in that: on the in-phase input end of described operational amplifier, be connected with earth resistance R2, in described resistance R 2, be parallel with electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420310101.4U CN203911448U (en) | 2014-06-12 | 2014-06-12 | Short message gateway with short circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420310101.4U CN203911448U (en) | 2014-06-12 | 2014-06-12 | Short message gateway with short circuit protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203911448U true CN203911448U (en) | 2014-10-29 |
Family
ID=51785694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420310101.4U Expired - Fee Related CN203911448U (en) | 2014-06-12 | 2014-06-12 | Short message gateway with short circuit protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203911448U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052017A (en) * | 2014-06-12 | 2014-09-17 | 四川联友电讯技术有限公司 | Short message gateway allowing short-circuit protection |
-
2014
- 2014-06-12 CN CN201420310101.4U patent/CN203911448U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052017A (en) * | 2014-06-12 | 2014-09-17 | 四川联友电讯技术有限公司 | Short message gateway allowing short-circuit protection |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141029 Termination date: 20190612 |