CN205945041U - Protection circuit with triple safeguard functions - Google Patents
Protection circuit with triple safeguard functions Download PDFInfo
- Publication number
- CN205945041U CN205945041U CN201620773945.1U CN201620773945U CN205945041U CN 205945041 U CN205945041 U CN 205945041U CN 201620773945 U CN201620773945 U CN 201620773945U CN 205945041 U CN205945041 U CN 205945041U
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- CN
- China
- Prior art keywords
- diode
- fuse
- protection circuit
- resistance
- tvs pipe
- 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.)
- Expired - Fee Related
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a protection circuit with triple safeguard functions, including diode V1, diode V2, diode V3, diode V4, resistance R1, resistance R2, fuse F1, fuse F2, TVS pipe and power, one end, resistance R1's one end, diode V1's positive pole and diode V3's the negative pole of TVS pipe all are connected with fuse F1's one end, and the other end, resistance R2's one end, diode V4's negative pole and diode V2's the positive pole of TVS pipe all are connected with fuse F2's one end, diode V1's negative pole, diode V2's negative pole and resistance R1's the other end all is connected with the power, diode V3's positive pole, diode V4's positive pole and resistance R2's the equal ground connection of the other end. The utility model has the advantages of realize the triple protections to the circuit through the electric current protection of fuse, the clamp voltage protection of TVS pipe and the voltage protection of a plurality of diodes.
Description
Technical field
The utility model is related to a kind of interface protective circuit, more particularly, to a kind of protection electricity with triple safeguard functions
Road.
Background technology
At present, in building automation and coutrol equipment, mostly it is required for RS485 communication function, but control scene electricity in building
Compression ring border is complicated, there is the strong jamming equipment such as frequency converter, heavy-duty motor, transformer, the presence of these interference sources, for building
For the RS485 communication interface of control device, it is all the larger threat of ratio, if interface protection is not abundant, often cause
The damage of RS485 communication interface or be the damage causing RS485 interface chip, so gives equipment normal very big using bringing
Threaten, and produce a lot of maintenance costs.The safeguard measure of current building control device RS485 communication interface is relatively single, main
If increasing TVS pipe in interface, if when disturbing source power larger, easily causing the damage of TVS pipe, communication function can not
Voluntarily recover, need repairing, using to equipment makes troubles.
Utility model content
In order to overcome the deficiencies in the prior art, the purpose of this utility model is to provide and a kind of has triple safeguard functions
Protection circuit, it can be from many aspects protection circuit.
The purpose of this utility model employs the following technical solutions realization：
A kind of protection circuit with triple safeguard functions, including diode V1, diode V2, diode V3, diode
V4, resistance R1, resistance R2, fuse F1, fuse F2, TVS pipe and power supply；One end of TVS pipe, one end of resistance R1, two poles
The negative electrode of the anode of pipe V1 and diode V3 is all connected with one end of fuse F1, the other end of TVS pipe, one end of resistance R2,
The anode of the negative electrode of diode V4 and diode V2 is all connected with one end of fuse F2；The negative electrode of diode V1, diode V2
Negative electrode and the other end of resistance R1 be all connected with power supply；The anode of diode V3, the anode of diode V4 and resistance R2's is another
One end is all grounded.
Preferably, protection circuit also includes RS485 interface chip and external apparatus interface J1, the other end of fuse F1
All it is connected with external apparatus interface J1 with the other end of fuse F2, positive terminal A of RS485 interface chip and one end of TVS pipe
Connect, the end of oppisite phase B of RS485 interface chip is connected with the other end of TVS pipe, the power end of RS485 interface chip connects power supply,
The ground terminal ground connection of RS485 interface chip.
Preferably, protection circuit also includes electric capacity, the power end of one end of electric capacity and RS485 interface chip connects, electricity
The other end ground connection held.
Preferably, model MAX487ESE of RS485 interface chip.
Preferably, described TVS pipe is two-way TVS pipe.
Preferably, the clamp voltage of described TVS pipe is 6V.
Preferably, the forward conduction voltage of described diode V1 and diode V2 is 0.7V.
Preferably, the forward conduction voltage of described diode V3 and diode V4 is 0.7V.
Preferably, the blowout current of described fuse F1 and fuse F2 is 100mA.
Preferably, described fuse F1 and fuse F2 is resettable fuse.
Compared to existing technology, the beneficial effects of the utility model are：Pincers by the current protection of fuse, TVS pipe
The triple protection to circuit is realized in the voltage protection of position voltage protection and multiple diode.
Brief description
Fig. 1 is the circuit diagram of the protection circuit with triple safeguard functions of the present utility model.
Specific embodiment
Below, in conjunction with accompanying drawing and specific embodiment, the utility model is described further：
A kind of protection circuit with triple safeguard functions, as shown in figure 1, include RS485 interface chip D1, electric capacity C41,
External apparatus interface J1, diode V1, diode V2, diode V3, diode V4, resistance R1, resistance R2, fuse F1, guarantor
Dangerous silk F2, TVS pipe V5 and power supply；
Model MAX487ESE of described RS485 interface chip D1.
One end of TVS pipe V5, one end of resistance R1, the anode of diode V1, the negative electrode of diode V3 and fuse F1's
One end is all connected with the in-phase end A of RS485 interface chip D1, the other end of TVS pipe V5, one end of resistance R2, diode V4
One end of negative electrode, the anode of diode V2 and fuse F2 is all connected with the end of oppisite phase B of RS485 interface chip D1；Diode V1
The other end of negative electrode, the negative electrode of diode V2 and resistance R1 be all connected with power supply；The anode of diode V3, the sun of diode V4
The other end of pole and resistance R2 is all grounded；The other end of the other end of fuse F1 and fuse F2 all with external apparatus interface J1
Connect；One end of the power end of RS485 interface chip D1 and electric capacity C41 is all connected with power supply, the ground terminal of RS485 interface chip D1
All it is grounded with the other end of electric capacity C41.
Described fuse F1 and fuse F2 is resettable fuse, and the blowout current of fuse F1 and fuse F2 is equal
For 100mA；When the electric current of the electric signal being exported by external apparatus interface J1 is more than 100mA, fuse F1 and/or fuse F2 meeting
Fusing, the now electric signal interruption in circuit, when the electric current of electric signal is less than 100mA, fuse F1 and/or fuse F2 is certainly
Dynamic recovery conducting；Fuse F1 and fuse F2 provides first for RS485 interface chip D1 and protects again.
Described TVS pipe V5 is two-way TVS pipe, and the clamp voltage of TVS pipe V5 is 6V；When the voltage of electric signal is more than 6V,
TVS pipe V5 instantaneously by clamped for the current potential at TVS pipe V5 two ends in 6V, that is, by the in-phase end A of RS485 interface chip D1 and anti-phase
Hold the voltage clamping between B in 6V, in case the voltage of electric signal is excessive burns out RS485 interface chip D1；TVS pipe V5 is RS485
Interface chip D1 provides second and protects again.
Described diode V1, the forward conduction voltage of diode V2, diode V3 and diode V4 are 0.7V, diode
V1 and diode V3 makes the limiting voltage of the forward end A of RS485 interface chip D1 between -0.7V to 5.7V, diode V2 and
Diode V4 makes the limiting voltage of end of oppisite phase B between -0.7V to 5.7V.Diode V1, diode V2, diode V3 and two poles
Pipe V4 provides triple protection for RS485 interface chip D1.
Resistance R1 and resistance R2 is 4.7K ohm.
It will be apparent to those skilled in the art that can technical scheme as described above and design, make other various
Corresponding change and deformation, and all these change and deformation all should belong to the protection of the utility model claim
Within the scope of.
Claims (10)
1. a kind of protection circuit with triple safeguard functions is it is characterised in that include diode V1, diode V2, diode
V3, diode V4, resistance R1, resistance R2, fuse F1, fuse F2, TVS pipe and power supply；One end of TVS pipe, resistance R1
The negative electrode of one end, the anode of diode V1 and diode V3 is all connected with one end of fuse F1, the other end of TVS pipe, resistance
The anode of one end of R2, the negative electrode of diode V4 and diode V2 is all connected with one end of fuse F2；The negative electrode of diode V1,
The other end of the negative electrode of diode V2 and resistance R1 is all connected with power supply；The anode of diode V3, the anode of diode V4 and electricity
The other end of resistance R2 is all grounded.
2. protection circuit as claimed in claim 1 is it is characterised in that also include RS485 interface chip and external apparatus interface
J1, the other end of the other end of fuse F1 and fuse F2 is all connected with external apparatus interface J1, and RS485 interface chip is just
Mutually end A is connected with one end of TVS pipe, and the end of oppisite phase B of RS485 interface chip is connected with the other end of TVS pipe, RS485 interface core
The power end of piece connects power supply, the ground terminal ground connection of RS485 interface chip.
3. protection circuit as claimed in claim 2 is it is characterised in that also include electric capacity, one end of electric capacity and RS485 interface core
The power end of piece connects, the other end ground connection of electric capacity.
4. protection circuit as claimed in claim 2 is it is characterised in that model MAX487ESE of RS485 interface chip.
5. protection circuit as claimed in claim 1 is it is characterised in that described TVS pipe is two-way TVS pipe.
6. protection circuit as claimed in claim 1 is it is characterised in that the clamp voltage of described TVS pipe is 6V.
7. protection circuit as claimed in claim 1 is it is characterised in that the forward conduction of described diode V1 and diode V2 is electric
Pressure is 0.7V.
8. protection circuit as claimed in claim 1 is it is characterised in that the forward conduction of described diode V3 and diode V4 is electric
Pressure is 0.7V.
9. protection circuit as claimed in claim 1 is it is characterised in that the blowout current of described fuse F1 and fuse F2 is equal
For 100mA.
10. protection circuit as claimed in claim 1 is it is characterised in that described fuse F1 and fuse F2 is self- recoverage
Fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620773945.1U CN205945041U (en) | 2016-07-20 | 2016-07-20 | Protection circuit with triple safeguard functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620773945.1U CN205945041U (en) | 2016-07-20 | 2016-07-20 | Protection circuit with triple safeguard functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205945041U true CN205945041U (en) | 2017-02-08 |
Family
ID=57926733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620773945.1U Expired - Fee Related CN205945041U (en) | 2016-07-20 | 2016-07-20 | Protection circuit with triple safeguard functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205945041U (en) |
-
2016
- 2016-07-20 CN CN201620773945.1U patent/CN205945041U/en not_active Expired - Fee Related
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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: 20170208 Termination date: 20180720 |