CN206506290U - A kind of hot plug protection circuit - Google Patents
A kind of hot plug protection circuit Download PDFInfo
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- CN206506290U CN206506290U CN201621419317.XU CN201621419317U CN206506290U CN 206506290 U CN206506290 U CN 206506290U CN 201621419317 U CN201621419317 U CN 201621419317U CN 206506290 U CN206506290 U CN 206506290U
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- Prior art keywords
- protection circuit
- electromagnetic interface
- interface filter
- hot plug
- power switch
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Abstract
The utility model discloses a kind of hot plug protection circuit, belong to circuit protection technology field.It includes data wire protection circuit and power protecting circuit; wherein; data wire protection circuit includes pull-up resistor, neck and electromagnetic interface filter; described pull-up resistor one end connects the power supply of electromagnetic interface filter; input and the data line terminal connection of the pull-up resistor other end and electromagnetic interface filter; the output end of electromagnetic interface filter is connected with neck; described power protecting circuit includes flash power switch and TVS diode; flash power switch input is connected with power supply terminal, is connected after output end is in parallel with TVS diode with neck.The data wire of chip passes through pull-up resistor and electromagnetic interface filter compound action; play a part of preventing over-voltage and over-current and overheat; chip internal structure performance is protected, by flash power switch and TVS diode collective effect in power protecting circuit, the effect of protection chip is played.
Description
Technical field
The utility model is related to circuit protection technology field, more particularly to a kind of hot plug protection circuit.
Background technology
Hot plug (Hot Swap) refers to circuit board is inserted or removed in the backboard of charging operation.The technology is adapted to application
In the system with core bus (system has multiple plug-in units, and the power supply and part signal of each plug-in unit are connected together).Its
It is mainly characterized by the case where maintaining the voltage of System Backplane, changes the circuit board that breaks down, and other circuits are being just in guarantee system
Often running.Advantage is to facilitate the upgrading and maintenance of system hardware, shortens the system trouble analysis time；Avoid in system not
The failure that circuit board triggers is plugged in the case of power-off, maintenance cost is reduced.
During SD card, SIM card or single-plate hot-plug, electrostatic and dash current can cause component failure in plate, shadow
Acoustic system reliability.And conventional means of defence：Such as length needle connector, the interface chip with hot plug and string resistance plus TVS
Deng the problem of there is higher cost and larger occupancy plate suqare.
Chinese invention patent, publication number：103166166B, publication date：On June 1st, 2016, disclosure of the invention invention is related to
And hot-swapping controller.The invention is directed to prior art hot-swapping controller, and soft start function defect and job insecurity are asked
There is provided a kind of hot plug controller protective circuit for topic, it is to avoid hot-swapping controller misoperation, and the inventive technique scheme is that heat is inserted
Controller protection circuit, including voltage detecting circuit, delay circuit and on-off circuit are pulled out, the voltage detecting circuit input connects
Input voltage and reference voltage are connect, the voltage detecting circuit output end is connected by delay circuit with on-off circuit control end,
The on-off circuit is connected between hot-swapping controller triggering end and ground.The technical scheme of the invention, by reasonably setting
Voltage and reference voltage are detected, switch conduction can be made at under-voltage, the voltage of hot-swapping controller triggering end is dragged down, so that
The output voltage of hot-swapping controller is closed, it is evaded falling the issuable misoperation of input voltage fluctuation.Its weak point
It is：The patent is the hot plug control circuit for high voltage power supply (+9V to+80V), and the circuit structure is complicated, space-consuming
Greatly, price is higher, is not suitable for promoting in mobile phone, computer, backboard power supply etc. is+5V or+3.3V industrial electrical equipment fields
Use.
Utility model content
1. the utility model technical problem to be solved
For the problem of P plug-and-play circuits cost in the prior art is higher and space-consuming is big, the utility model is provided
A kind of hot plug protection circuit.It can meet with extremely low cost and it is minimum account for plate suqare, realize highly reliable hot plug
Protection.
2. technical scheme
To solve the above problems, the technical scheme that the utility model is provided is：
A kind of hot plug protection circuit, including data wire protection circuit and power protecting circuit, wherein, data wire protection electricity
Road includes pull-up resistor, neck and electromagnetic interface filter, and described pull-up resistor one end connects the power supply of electromagnetic interface filter, pull-up
Input and the data line terminal connection of the resistance other end and electromagnetic interface filter, the output end of electromagnetic interface filter are connected with neck, institute
The power protecting circuit stated includes flash power switch and TVS diode, and flash power switch input is connected with power supply terminal,
It is connected after output end is in parallel with TVS diode with neck.
Preferably, described electromagnetic interface filter is π type filter circuits, in each TVS in parallel in the two ends of π type filter circuits
Diode.
Preferably, described electromagnetic interface filter is the TPD4F003 or the TPD8F003 of 8 passages of TI 4 passages.
Preferably, the power supply of described electromagnetic interface filter is 3.3V direct voltage sources.
Preferably, the model AIC1526-0CS of described flash power switch, described TVS diode is
SMBJ5.0CA。
Preferably, flash power switch AIC1526-0CS terminal IN and 3.3V direct voltage sources, the one of resistance R433
End, resistance R434 one end, electric capacity C3 one end and electric capacity C220 one end connection, electric capacity the C3 other end and electric capacity C220
Other end ground connection, flash power switch AIC1526-0CS terminal ENA is connected with the other end of data line end, resistance R433,
The resistance R434 other end is connected with flash power switch AIC1526-0CS terminal ENB, and electric capacity C222 and electric capacity C221 are simultaneously
Connection, flash power switch AIC1526-0CS terminal OUTA and terminal OUTB are connected to electric capacity C222 two ends, flash
Power switch AIC1526-0CS terminal OUTB ground connection, flash power switch AIC1526-0CS terminal OUTA meets power supply VCC_
SD。
Preferably, power supply VCC_SD and the port on neck, TVS diode SMBJ5.0CA one end and electric capacity C223
One end is connected, and the port on the TVS diode SMBJ5.0CA other end, electric capacity the C223 other end and neck is grounded.
Preferably, neck terminal GROUND1 and GROUND2 is grounded.
Preferably, described neck connects the EMI of one 8 passage of electromagnetic interface filter TPD4F003 or connection of 24 passages
Wave filter TPD8F003.
Preferably, the resistance value of described pull-up resistor, resistance R433 and resistance 434 is 10K Ω.
3. beneficial effect
The technical scheme provided using the utility model, compared with prior art, is had the advantages that：
(1) a kind of hot plug protection circuit of the present utility model, in data wire protection circuit, the data wire of chip passes through
Pull-up resistor and electromagnetic interface filter compound action, play a part of preventing over-voltage and over-current and overheat, protect chip internal structure
Can, by flash power switch and TVS diode collective effect in power protecting circuit, play the effect of protection chip；
(2) a kind of hot plug protection circuit of the present utility model, electromagnetic interface filter is the TPD4F003 or 8 of TI 4 passages
The TPD8F003 of passage, the power supply of described electromagnetic interface filter is 3.3V DC voltages.In practical application, band ESD protections
Electromagnetic interface filter, depending on the data line ports according to chip, can finally realize that each data line terminal and EMI of chip are filtered
Ripple device is connected, and realizes the protection to data wire；
(3) a kind of hot plug protection circuit of the present utility model, the electromagnetic interface filter TPD4F003 every channel circuit in inside is such as
It is π type (C-R-C) filter circuit shown in Fig. 2, two ends respectively add a TVS diode, and cost is 1 yuan or so, and cost is low, accounts for
Plate suqare 1.7mm × 1.35mm, is slightly less than the Chip-R of 0805 encapsulation, occupies little space, can be in mobile phone, computer and PAD etc.
Promoted the use of in equipment；
(4) a kind of hot plug protection circuit of the present utility model, flash power switch AIC1526-0CS features are：Bilateral
Road；500mA continuous load currents；Current limliting/short-circuit protection；Thermal shutdown is protected；Undervoltage lockout；Band is enabled and indicating fault,
AIC1526-0CS encapsulates for SO-8, and cost is 1.5 yuan or so, and cost is low.TVS diode uses SMBJ5.0CA, and effect was
Pressure protection, cost accounts for plate suqare maximum 5.6mm × 3.95mm, occupies little space, can meet with extremely low at 0.2 yuan or so
Cost and it is minimum account for plate suqare, realize highly reliable hot plug protection；
(5) a kind of hot plug protection circuit of the present utility model, using existing integrated circuit, cost is low, circuit structure
Simply, occupy little space, can be promoted the use of in the equipment such as CPU, chip, mobile phone；
(6) a kind of hot plug protection circuit of the present utility model, flash power switch AIC1526-0CS and electromagnetic interface filter
Hot plug control circuit is carried in the hot plug protection circuit that TPD4F003 is constituted substantially all with undervoltage lockout and soft start function,
Without additional complicated control circuit.
Brief description of the drawings
Fig. 1 is data wire protection circuit of the present utility model；
Fig. 2 is π types filter circuit of the present utility model；
Fig. 3 is power protecting circuit of the present utility model.
Embodiment
To further appreciate that content of the present utility model, the utility model is described in detail with reference to drawings and Examples.
Embodiment 1
With reference to Fig. 1-3, a kind of hot plug protection circuit, including data wire protection circuit and power protecting circuit, wherein, such as
Shown in Fig. 1, data wire protection circuit includes pull-up resistor, neck and electromagnetic interface filter, described pull-up resistor one end connection EMI
Input and the data line terminal connection of the power supply of wave filter, the pull-up resistor other end and electromagnetic interface filter, electromagnetic interface filter
Output end be connected with neck, it is high as shown in figure 3, described power protecting circuit includes flash power switch and TVS diode
Side power switch input is connected with power supply terminal, is connected after output end is in parallel with TVS diode with neck.
A kind of hot plug protection circuit of the present embodiment, in data wire protection circuit, the data wire of chip passes through pull-up
Resistance and electromagnetic interface filter compound action, play a part of preventing over-voltage and over-current and overheat, protect chip internal structure performance,
By flash power switch and TVS diode collective effect in power protecting circuit, the effect of protection chip is played.
Embodiment 2
A kind of hot plug protection circuit of the present embodiment, it is similar to Example 1, wherein, described electromagnetic interface filter is π types
Filter circuit, in each TVS diode in parallel in the two ends of π type filter circuits, as shown in Fig. 2 terminal Ch_In filters for EMI
The input of device, terminal Ch_Out is that the resistance value in the output end of electromagnetic interface filter, electromagnetic interface filter is 100 Ω, two electric capacity
Size be 8.5pF.
Embodiment 3
A kind of hot plug protection circuit of the present embodiment, it is similar to Example 1, wherein, described electromagnetic interface filter is TI's
The TPD4F003 of 4 passages or 8 passages TPD8F003, the power supply of described electromagnetic interface filter is 3.3V DC voltages.It is real
In the application of border, the electromagnetic interface filter of band ESD protections can finally realize every number of chip depending on the data line ports according to chip
All it is connected according to line terminals with electromagnetic interface filter, realizes the protection to data wire.
Electromagnetic interface filter TPD4F003 inside is per channel circuit as shown in Fig. 2 being π type (C-R-C) filter circuit, two
End respectively adds a TVS diode, and cost is 1 yuan or so, and cost is low, accounts for plate suqare 1.7mm × 1.35mm, is slightly less than 0805 envelope
The Chip-R of dress, occupies little space, and can be promoted the use of in the equipment such as mobile phone, computer and PAD.
Embodiment 4
A kind of hot plug protection circuit of the present embodiment, it is similar to Example 1, wherein, described flash power switch
Model AIC1526-0CS, described TVS diode is SMBJ5.0CA.Flash power switch AIC1526-0CS's is antistatic
Performance is：Atmospherical discharges ± 20KV, contact discharge ± 12KV ,-three dB bandwidth 200MHz.
Flash power switch AIC1526-0CS features are：Binary channels；500mA continuous load currents；Current limliting/short-circuit protection；
Thermal shutdown is protected；Undervoltage lockout；Band is enabled and indicating fault, and AIC1526-0CS encapsulates for SO-8, and cost is 1.5 yuan or so, into
This is low.TVS diode uses SMBJ5.0CA, and effect is overvoltage protection, and cost accounts for plate suqare maximum 5.6mm at 0.2 yuan or so
× 3.95mm, occupies little space, can meet with extremely low cost and it is minimum account for plate suqare, realize that highly reliable hot plug is prevented
Shield.
As shown in figure 3, flash power switch AIC1526-0CS terminal IN and 3.3V direct voltage sources, resistance R433
One end, resistance R434 one end, electric capacity C3 one end and electric capacity C220 one end connection, electric capacity the C3 other end and electric capacity C220
Other end ground connection, flash power switch AIC1526-0CS terminal ENA is connected with the other end of data line end, resistance R433,
The resistance R434 other end is connected with flash power switch AIC1526-0CS terminal ENB, and electric capacity C222 and electric capacity C221 are simultaneously
Connection, flash power switch AIC1526-0CS terminal OUTA and terminal OUTB are connected to electric capacity C222 two ends, flash
Power switch AIC1526-0CS terminal OUTB ground connection, flash power switch AIC1526-0CS terminal OUTA connects power supply
VCC_SD。
Power supply VCC_SD and the port on neck, TVS diode SMBJ5.0CA one end and electric capacity C223 one end connect
Connect, the port on the TVS diode SMBJ5.0CA other end, electric capacity the C223 other end and neck is grounded.
In Fig. 3, resistance R433 and resistance R434 resistance are that 10K Ω, electric capacity C3 and electric capacity C222 are 0.1uF, electricity
Appearance C221 is 10uF.
The present embodiment utilizes existing integrated circuit, and cost is low, and circuit structure is simple, occupies little space, can be in industrial electro
Promoted the use of in the equipment such as sub- equipment, computer, mobile phone.
Embodiment 5
A kind of hot plug protection circuit of the present embodiment, it is similar to Example 1, wherein, neck terminal GROUND1 and
GROUND2 is grounded, and described neck connects the EMI filters of one 8 passage of electromagnetic interface filter TPD4F003 or connection of 24 passages
Ripple device TPD8F003, realizes the effect of all data line terminals protection to chip, described pull-up resistor, resistance R433 and electricity
The resistance value for hindering R434 is 10K Ω.
Schematically the utility model and embodiments thereof are described above, the description does not have restricted, accompanying drawing
Shown in be also one of embodiment of the present utility model, actual structure is not limited thereto.So, if this area
Those of ordinary skill enlightened by it, do not departing from the case that the utility model creates objective, designed without creative
The frame mode similar to the technical scheme and embodiment, all should belong to protection domain of the present utility model.
Claims (10)
1. a kind of hot plug protection circuit, it is characterised in that including data wire protection circuit and power protecting circuit, wherein, number
Include pull-up resistor, neck and electromagnetic interface filter according to line protection circuit, described pull-up resistor one end connects the confession of electromagnetic interface filter
Power supply, the pull-up resistor other end and electromagnetic interface filter input and data line terminal connection, the output end of electromagnetic interface filter with
Neck is connected, and described power protecting circuit includes flash power switch and TVS diode, flash power switch input and electricity
Source terminal is connected, and is connected after output end is in parallel with TVS diode with neck.
2. a kind of hot plug protection circuit according to claim 1, it is characterised in that described electromagnetic interface filter is filtered for π types
Wave circuit, in each TVS diode in parallel in the two ends of π type filter circuits.
3. a kind of hot plug protection circuit according to claim 1 or 2, it is characterised in that described electromagnetic interface filter is 4
The TPD4F003 of passage or 8 passages TPD8F003.
4. a kind of hot plug protection circuit according to claim 3, it is characterised in that the power supply of described electromagnetic interface filter
Power supply is 3.3V direct voltage sources.
5. a kind of hot plug protection circuit according to claim 1, it is characterised in that the type of described flash power switch
Number it is AIC1526-0CS, described TVS diode is SMBJ5.0CA.
6. a kind of hot plug protection circuit according to claim 5, it is characterised in that flash power switch AIC1526-
0CS terminal IN and 3.3V direct voltage sources, resistance R433 one end, resistance R434 one end, electric capacity C3 one end and electric capacity
C220 one end connection, the electric capacity C3 other end and electric capacity C220 other end ground connection, flash power switch AIC1526-0CS's
Terminal ENA is connected with the other end of data line end, resistance R433, resistance the R434 other end and flash power switch AIC1526-
0CS terminal ENB connections, electric capacity C222 and electric capacity C221 are in parallel, flash power switch AIC1526-0CS terminal OUTA and end
Sub- OUTB is connected to electric capacity C222 two ends, flash power switch AIC1526-0CS terminal OUTB ground connection, flash power supply
Switch AIC1526-0CS terminal OUTA meets power supply VCC_SD.
7. a kind of hot plug protection circuit according to claim 6, it is characterised in that power supply VCC_SD and the end on neck
One end connection of mouth, TVS diode SMBJ5.0CA one end and electric capacity C223, TVS diode the SMBJ5.0CA other end, electricity
The port held on the C223 other end and neck is grounded.
8. a kind of hot plug protection circuit according to claim 1, it is characterised in that neck terminal GROUND1 and
GROUND2 is grounded.
9. a kind of hot plug protection circuit according to claim 3, it is characterised in that described neck connects 24 passages
Electromagnetic interface filter TPD4F003 or connect 8 passages electromagnetic interface filter TPD8F003.
10. a kind of hot plug protection circuit according to claim 6, it is characterised in that described pull-up resistor, resistance
The resistance value of R433 and resistance 434 is 10K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621419317.XU CN206506290U (en) | 2016-12-22 | 2016-12-22 | A kind of hot plug protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621419317.XU CN206506290U (en) | 2016-12-22 | 2016-12-22 | A kind of hot plug protection circuit |
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| Publication Number | Publication Date |
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| CN206506290U true CN206506290U (en) | 2017-09-19 |
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ID=59842536
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621419317.XU Active CN206506290U (en) | 2016-12-22 | 2016-12-22 | A kind of hot plug protection circuit |
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| CN (1) | CN206506290U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114006354A (en) * | 2021-09-16 | 2022-02-01 | 北京无线电测量研究所 | Overcurrent protection circuit |
-
2016
- 2016-12-22 CN CN201621419317.XU patent/CN206506290U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114006354A (en) * | 2021-09-16 | 2022-02-01 | 北京无线电测量研究所 | Overcurrent protection circuit |
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