CN106486992A - A kind of interface protective circuit with oscillating characteristic and method - Google Patents
A kind of interface protective circuit with oscillating characteristic and method Download PDFInfo
- Publication number
- CN106486992A CN106486992A CN201510537022.6A CN201510537022A CN106486992A CN 106486992 A CN106486992 A CN 106486992A CN 201510537022 A CN201510537022 A CN 201510537022A CN 106486992 A CN106486992 A CN 106486992A
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- CN
- China
- Prior art keywords
- overvoltage
- electric capacity
- transient suppression
- protecting unit
- switching mode
- 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.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Abstract
The invention discloses a kind of protection circuit with vibration LC feature-based interface and method, it is related to the communications field.Circuit disclosed by the invention; including first Overvoltage protecting unit in parallel with electric capacity on interface circuit; described first Overvoltage protecting unit; lightning surge, power line lapping and contact generation interference when; discharge the energy on described electric capacity; wherein, described first Overvoltage protecting unit includes one or more overvoltage protectors.The invention also discloses a kind of interface protection method with vibration LC characteristic.Can be in lightning surge, power line lapping with when the interference such as contacting and producing using technical scheme; the energy in energy quick release LC loop; suppression or the generation reducing LC resonant energy, solve to lead to the drawbacks of broadband signal attenuation and distortion when protection device junction capacity is larger simultaneously.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of guarantor with vibration LC feature-based interface
Protection circuit and method.
Background technology
In communication field, the such as subscribers' line such as xDSL, G.FAST, its transmission circuit passes through to transmit transformation
Device and electric capacity composition high pass couples circuit, interface circuit has LC characteristic, need to protect lightning surge,
Power line lapping and the interference contacting, protect to the circuit and equipment being connected.
Conventional protection circuit, commonly used anti-overflow, overvoltage crowbar may refer to Fig. 1 and Tu
2.
Fig. 1 protection device is by switching mode Transient Suppression Diode (Thyristor Surge Suppressor, letter
Referred to as TSS), PTC thermistor device (Positive Temperature Coefficient, letter
Referred to as PTC) and gas-discharge tube (Gas discharge tube, referred to as GDT) composition.These devices
Part is attempted by subscribers' line.With the increase of analog bandwidth, the parasitic capacitance to protection device and electric leakage
Stream has strict demand, and when junction capacity is too high, the high fdrequency components of meeting attenuated differential signals lead to distorted signals.
It is fast that the advantage of TSS device is in response to speed, bears that electric current is larger, and shortcoming is that junction capacity is big, GDT device
Although junction capacity is little, larger lightning surge can be born, there is residual voltage height and the unstable phenomenon of residual voltage,
It is easily caused and damaged by protection circuit.
Fig. 2 is the reduction procedure of Fig. 1, eliminates TSS device and PTC although junction capacity is less, but
Due to residual voltage and the unstable defect of GDT itself, docking port defencive function is limited.
There is the interface circuit of LC characteristic, in over-voltage protector action, due to the wink of protection device
Between short circuit make LC form resonant tank, now most of interfering energy concentrates on electric capacity, by LC
Constantly discharge and recharge, high frequency resonant signals are easy to be coupled to chip side by inductive loads such as transmission transformers
Lead to device failure.
Content of the invention
The technical problem to be solved is to provide a kind of interface protective circuit with LC characteristic
And method, to solve the existing interface circuit with LC characteristic the asking of device failure in overvoltage protection
Topic.
In order to solve above-mentioned technical problem, the invention discloses a kind of interface with vibration LC characteristic is protected
Protection circuit, including first Overvoltage protecting unit in parallel with electric capacity on interface circuit, described first overvoltage is protected
Shield unit, lightning surge, power line lapping and contact generation interference when, release described electric capacity on energy
Amount, wherein, described first Overvoltage protecting unit includes one or more overvoltage protectors.
Alternatively, in foregoing circuit, described overvoltage protector includes switching mode Transient Suppression Diode；
When described first Overvoltage protecting unit includes a switching mode Transient Suppression Diode, this switching mode
Transient Suppression Diode and electric capacity are in parallel, and this switching mode Transient Suppression Diode is in lightning surge, electric lines of force
When overlap joint is with contacting generation interference, for discharging differential mode interference energy on described electric capacity；
When described first Overvoltage protecting unit includes two switching mode Transient Suppression Diodes, two switches
In parallel with electric capacity after the series connection of type Transient Suppression Diode, and between two switching mode Transient Suppression Diodes
Connected pin is connected to protecting field, and this two switching mode Transient Suppression Diodes are in lightning surge, electric power
When line overlaps with contacting generation interference, for discharging common mode disturbances and differential mode interference energy on described electric capacity.
Alternatively, foregoing circuit also includes：
Series connection excessively stream on the line and decoupling device, and it is connected in parallel on the second overvoltage protection on user's line
Unit.
Alternatively, in foregoing circuit, described excessively stream and decoupling device include two positive temperature coefficient temperature-sensitive electricity
Resistance, is serially connected between transmission transformer inductance two ends and the second Overvoltage protecting unit respectively.
Alternatively, in foregoing circuit, described second Overvoltage protecting unit includes three pole gas-discharge tubes or two
Individual two pole gas-discharge tubes, when described second Overvoltage protecting unit includes two two pole gas-discharge tubes,
The crura intermedium of two two pole gas-discharge tubes is connected to protecting field.
The invention also discloses a kind of interface protection method with vibration LC characteristic, including：
The first Overvoltage protecting unit in parallel on the electric capacity of interface circuit with LC characteristic, wherein, institute
State the first Overvoltage protecting unit and include one or more overvoltage protectors；
When lightning surge, power line lapping and contact generation interference when, described first Overvoltage protecting unit will
Energy on the electric capacity of the described interface circuit with LC characteristic is discharged.
Alternatively, in said method, described overvoltage protector includes switching mode Transient Suppression Diode, institute
State the first Overvoltage protecting unit to be released the energy on the electric capacity of the described interface circuit with LC characteristic
The process put includes：
When described first Overvoltage protecting unit includes a switching mode Transient Suppression Diode, switching mode wink
State suppression diode and electric capacity are in parallel, and in lightning surge, power line lapping with when contact generation and disturbing,
This switching mode Transient Suppression Diode discharges differential mode interference energy on described electric capacity；
When described first Overvoltage protecting unit includes two switching mode Transient Suppression Diodes, two switches
In parallel with electric capacity after the series connection of type Transient Suppression Diode, and between two switching mode Transient Suppression Diodes
Connected pin is connected to protecting field, lightning surge, power line lapping and contact generation interference when, should
Two switching mode Transient Suppression Diodes discharge common mode disturbances and differential mode interference energy on described electric capacity.
Alternatively, said method also includes：
Series connection excessively stream and decoupling device on the line；
When lightning surge, power line lapping with when contacting generation interference, excessively stream and decoupling device are carried out respectively
Overcurrent protection and decoupling are processed.
Alternatively, said method also includes：
The second Overvoltage protecting unit in parallel on user's line；
When lightning surge, power line lapping and contact generation interference when, described second Overvoltage protecting unit will
Interfering energy on described user's line is discharged.
In lightning surge, power line lapping and the interference such as can contact and produce using technical scheme
When, the energy in energy quick release LC loop, suppression or the generation reducing LC resonant energy, solve simultaneously
Certainly protection device junction capacity leads to the drawbacks of broadband signal attenuation and distortion when larger.
Brief description
Fig. 1 is one of prior art protection circuit schematic diagram；
Fig. 2 is the two of prior art protection circuit schematic diagram；
Fig. 3 is protection circuit structural representation of the present invention；
Fig. 4 is one of embodiment of the present invention protection schematic diagram circuit；
Fig. 5 is the two of embodiment of the present invention protection circuit schematic diagram；
Fig. 6 is the three of embodiment of the present invention protection circuit schematic diagram.
Fig. 7 is the four of embodiment of the present invention protection circuit schematic diagram.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing pair
Technical solution of the present invention is described in further detail.It should be noted that in the case of not conflicting, this
Feature in the embodiment and embodiment of application can arbitrarily be mutually combined.
Embodiment 1
The present embodiment provides a kind of interface protective circuit with vibration LC characteristic, and this circuit includes and connects
Electric capacity the first Overvoltage protecting unit in parallel on mouthful circuit, this first Overvoltage protecting unit, lightning surge,
When power line lapping is with contacting generation interference, discharge the energy on electric capacity, wherein, the first overvoltage protection list
Unit can include one or more overvoltage protectors.
In addition, on the basis of foregoing circuit, can also include connecting excessively stream on the line and decoupler
Part, and it is connected in parallel on the second Overvoltage protecting unit on user's line.Now, whole circuit as shown in figure 3,
Including：Overvoltage crowbar 1 (i.e. the first Overvoltage protecting unit) in parallel is connected on circuit with electric capacity
On excessively stream and decoupling device, and the overvoltage crowbar 2 being connected in parallel on user's line (i.e. the second pressure is protected
Shield unit).
Described overvoltage crowbar 1 can be by switching mode Transient Suppression Diode or the pressure-sensitive electricity of metal-oxide
The composition such as resistance (Metal Oxide Varistor, referred to as MOV)；Described excessively stream and decoupling device are permissible
It is made up of semistor etc.；Described overvoltage crowbar 2 basis being connected in parallel on user's line
Difference requirement to line simulation bandwidth, can be by switching mode Transient Suppression Diode, or metal-oxide
Varistor, or gas-discharge tube composition.When lightning surge, power line lapping with the interference such as contact and produce
When, described overvoltage crowbar 1 action first, quickly the energy on electric capacity is discharged, greater degree
Interfering energy, by described excessively stream and the isolation of decoupling device decoupling, by the described mistake being connected in parallel on user's line
Voltage protection circuit 2 is released further.Because described overvoltage crowbar 1 is to be connected in parallel on LC feature-based interface
On the electric capacity of circuit, quickly the energy on electric capacity can not only be discharged, prevent LC resonance from producing high-frequency energy
Amount travels to chip lateral circuit and leads to device failure, and to the junction capacity of described overvoltage crowbar 1 not
Sensitivity, is conducive to Response to selection speed fast but junction capacity device bigger than normal.
It should be noted that according to requirement of shelter difference, described excessively stream and the decoupling device of user port,
Or described overvoltage crowbar 2 can be omitted with selectivity.Overvoltage crowbar 1 is according to differential mode and common mode
Requirement of shelter, can have one or more separate type overvoltage protectors, or an Integral overpressure protector
Part forms.
Below in conjunction with the accompanying drawings and concrete application illustrates the implementing of foregoing circuit.
Example 1
Specifically, the first Overvoltage protecting unit can include two switching mode Transient Suppression Diodes, now,
Whole circuit as shown in figure 4, overvoltage crowbar 1 is made up of two switching mode Transient Suppression Diodes,
Middle connected pin is connected to protecting field.Excessively stream and decoupling device are by two semistors
Composition, is serially connected between transmission transformer inductance two ends and overvoltage crowbar 2 respectively.Overvoltage protection electricity
Road 2 is made up of three pole gas-discharge tubes, and crura intermedium is connected to protecting field.
When lightning surge, power line lapping with the common mode such as contact or when differential mode interference produces, two switching modes
Transient Suppression Diode TSS1 and TSS2 action first, discharges the interference residual voltage on C2 electric capacity, PTC1
Play the effect of overcurrent protection and decoupling with PTC2, when interfering energy continues to increase, described overvoltage is protected
The GDT action of protection circuit 2, differential mode and common mode disturbances are released further.Due to during GDT action,
Major part originally concentrated on residual voltage on electric capacity C2 due to switching mode Transient Suppression Diode TSS1 and
The action of TSS2 discharges substantially, the LC that transmission transformer and electric capacity C2 are formed in GDT short circuit
Energy on resonant tank is less, and the interference being coupled to chip side also accordingly weakens.Protect with respect to tradition
Shield scheme, switching mode Transient Suppression Diode is attempted by user's line two ends, and the embodiment of the present invention
Switching mode Transient Suppression Diode TSS1 and TSS2 is attempted by electric capacity C2 two ends, switching mode transient state
The big shortcoming of suppression diode junction capacity itself will not cause to the broadband signal on subscribers' line to decay and lose
Very.
Example 2
Again for example, the first Overvoltage protecting unit can include a switching mode Transient Suppression Diode, now
The interface protective circuit of LC characteristic is essentially identical with the circuit structure of example 1, as shown in figure 5, different
Part is, described overvoltage crowbar 1 is made up of a switching mode Transient Suppression Diode, and differential mode is done
The energy disturbed is discharged first by TSS device, and bigger differential mode energy is released by GDT.Common mode is done
When disturbing, because the interfering energy that electric capacity C2 two ends produce is relatively small, can be released by GDT.
Example 3
The interface protective circuit of LC characteristic that this example provides is essentially identical with the circuit structure of example 1,
As shown in fig. 6, difference is, overvoltage crowbar 2 is made up of two gas-discharge tubes.
Example 4
The interface protective circuit of the LC characteristic that this example provides is the simple version of example 1, as Fig. 7 institute
Show, difference is, interface protective circuit only has overvoltage crowbar 1 to form, and can be used for not having electricity
Line of force sensing and the occasion of overlap joint requirement.
Embodiment 2
The present embodiment provides a kind of interface protection method with LC characteristic, and main inclusion is following to be operated：
The first Overvoltage protecting unit in parallel on the electric capacity of interface circuit with LC characteristic, wherein, the
One Overvoltage protecting unit includes one or more overvoltage protectors；
When lightning surge, power line lapping and contact generation interference when, the first Overvoltage protecting unit will have
Energy on the electric capacity of the interface circuit of LC characteristic is discharged.
In practical application, the overvoltage protector in the first Overvoltage protecting unit can include the suppression of switching mode transient state
Diode processed.For example, when the first Overvoltage protecting unit includes a switching mode Transient Suppression Diode, should
Switching mode Transient Suppression Diode and electric capacity are in parallel, and in lightning surge, power line lapping and contact generation
During interference, differential mode interference energy on this switching mode Transient Suppression Diode release electric capacity.First overvoltage protection
When unit includes two switching mode Transient Suppression Diodes, after two switching mode Transient Suppression Diode series connection
In parallel with electric capacity, and the pin being connected between two switching mode Transient Suppression Diodes is connected to protecting field,
Lightning surge, power line lapping and contact generation interference when, this two switching mode Transient Suppression Diodes
Common mode disturbances and differential mode interference energy on release electric capacity.
Furthermore it is also possible to connect on the line excessively stream and decoupling device, so, when lightning surge, electric power
When line overlaps with contacting generation interference, excessively stream and decoupling device can be to carry out overcurrent protection and decoupling respectively
Process.
Some preferred versions are also had to consider to there are interfering energy on user's line, therefore can be in user's line
Upper second Overvoltage protecting unit in parallel, when lightning surge, power line lapping and contact generation interference when, should
Interfering energy on user's line can be discharged by the second Overvoltage protecting unit.And specifically, it is preferable to scheme
In, excessively stream and decoupling device can adopt two semistors, are serially connected in transmission respectively and become
Between depressor inductance two ends and the second Overvoltage protecting unit.And the second Overvoltage protecting unit then can include three
Pole gas-discharge tube or two two pole gas-discharge tubes.
From above-described embodiment as can be seen that technical scheme, lightning surge, power line lapping and
When the interference such as contact produces, the energy in energy quick release LC loop, suppresses or reduces LC resonant energy
Generation, have more preferable protective effect to chip side device.Meanwhile, solve conventional protection circuit, by
Be attempted by user's line in over-voltage protector, protection device junction capacity is larger lead to broadband signal attenuation and
The drawbacks of distortion.
One of ordinary skill in the art will appreciate that all or part of step in said method can pass through program
Complete to instruct related hardware, described program can be stored in computer-readable recording medium, such as read-only
Memorizer, disk or CD etc..Alternatively, all or part of step of above-described embodiment can also use
One or more integrated circuits are realizing.Correspondingly, each module/unit in above-described embodiment can adopt
The form of hardware is realized, it would however also be possible to employ the form of software function module is realized.The application is not restricted to appoint
The combination of the hardware and software of what particular form.
The above, the only preferred embodiments of the present invention, it is not intended to limit the protection model of the present invention
Enclose.All any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done etc.,
Should be included within the scope of the present invention.
Claims (9)
1. a kind of interface protective circuit with vibration LC characteristic is it is characterised in that include and interface electricity
The first in parallel Overvoltage protecting unit of electric capacity on road, described first Overvoltage protecting unit, lightning surge,
When power line lapping is with contacting generation interference, discharge the energy on described electric capacity, wherein, described first mistake
Pressure protection location includes one or more overvoltage protectors.
2. circuit as claimed in claim 1 is it is characterised in that described overvoltage protector includes switching mode
Transient Suppression Diode；
When described first Overvoltage protecting unit includes a switching mode Transient Suppression Diode, this switching mode
Transient Suppression Diode and electric capacity are in parallel, and this switching mode Transient Suppression Diode is in lightning surge, electric lines of force
When overlap joint is with contacting generation interference, for discharging differential mode interference energy on described electric capacity；
When described first Overvoltage protecting unit includes two switching mode Transient Suppression Diodes, two switches
In parallel with electric capacity after the series connection of type Transient Suppression Diode, and between two switching mode Transient Suppression Diodes
Connected pin is connected to protecting field, and this two switching mode Transient Suppression Diodes are in lightning surge, electric power
When line overlaps with contacting generation interference, for discharging common mode disturbances and differential mode interference energy on described electric capacity.
3. circuit as claimed in claim 1 or 2 is it is characterised in that also include：
Series connection excessively stream on the line and decoupling device, and it is connected in parallel on the second overvoltage protection on user's line
Unit.
4. circuit as claimed in claim 3 it is characterised in that
Described excessively stream and decoupling device include two semistors, are serially connected in transmission respectively and become
Between depressor inductance two ends and the second Overvoltage protecting unit.
5. circuit as claimed in claim 3 it is characterised in that
Described second Overvoltage protecting unit includes three pole gas-discharge tubes or two two pole gas-discharge tubes, when
When described second Overvoltage protecting unit includes two two pole gas-discharge tubes, two two pole gas-discharge tubes
Crura intermedium is connected to protecting field.
6. a kind of interface protection method with vibration LC characteristic is it is characterised in that include：
The first Overvoltage protecting unit in parallel on the electric capacity of interface circuit with LC characteristic, wherein, institute
State the first Overvoltage protecting unit and include one or more overvoltage protectors；
When lightning surge, power line lapping and contact generation interference when, described first Overvoltage protecting unit will
Energy on the electric capacity of the described interface circuit with LC characteristic is discharged.
7. method as claimed in claim 6 is it is characterised in that described overvoltage protector includes switching mode
Transient Suppression Diode, described first Overvoltage protecting unit is by the described interface circuit with LC characteristic
The process that energy on electric capacity is discharged includes：
When described first Overvoltage protecting unit includes a switching mode Transient Suppression Diode, switching mode wink
State suppression diode and electric capacity are in parallel, and in lightning surge, power line lapping with when contact generation and disturbing,
This switching mode Transient Suppression Diode discharges differential mode interference energy on described electric capacity；
When described first Overvoltage protecting unit includes two switching mode Transient Suppression Diodes, two switches
In parallel with electric capacity after the series connection of type Transient Suppression Diode, and between two switching mode Transient Suppression Diodes
Connected pin is connected to protecting field, lightning surge, power line lapping and contact generation interference when, should
Two switching mode Transient Suppression Diodes discharge common mode disturbances and differential mode interference energy on described electric capacity.
8. method as claimed in claims 6 or 7 is it is characterised in that the method also includes：
Series connection excessively stream and decoupling device on the line；
When lightning surge, power line lapping with when contacting generation interference, excessively stream and decoupling device are carried out respectively
Overcurrent protection and decoupling are processed.
9. method as claimed in claim 8 is it is characterised in that the method also includes：
The second Overvoltage protecting unit in parallel on user's line；
When lightning surge, power line lapping and contact generation interference when, described second Overvoltage protecting unit will
Interfering energy on described user's line is discharged.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510537022.6A CN106486992A (en) | 2015-08-27 | 2015-08-27 | A kind of interface protective circuit with oscillating characteristic and method |
| PCT/CN2016/087297 WO2017032168A1 (en) | 2015-08-27 | 2016-06-27 | Protection circuit for interface with oscillation characteristic and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510537022.6A CN106486992A (en) | 2015-08-27 | 2015-08-27 | A kind of interface protective circuit with oscillating characteristic and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106486992A true CN106486992A (en) | 2017-03-08 |
Family
ID=58099573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510537022.6A Pending CN106486992A (en) | 2015-08-27 | 2015-08-27 | A kind of interface protective circuit with oscillating characteristic and method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106486992A (en) |
| WO (1) | WO2017032168A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565510A (en) * | 2017-10-25 | 2018-01-09 | 上海长园维安电子线路保护有限公司 | A kind of circuit protecting device with excessively stream and over-voltage protecting function |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108428697A (en) * | 2017-11-09 | 2018-08-21 | 上海长园维安微电子有限公司 | A kind of low-capacitance bidirectional band negative resistance TVS device |
| CN112448377B (en) * | 2020-11-23 | 2023-05-09 | 国网甘肃省电力公司检修公司 | Strong electromagnetic pulse protection integrated module and printed circuit board processing method thereof |
| CN114915507B (en) * | 2022-07-01 | 2024-03-01 | 智道网联科技(北京)有限公司 | Gigabit POE power supply communication circuit |
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| US5142429A (en) * | 1990-05-07 | 1992-08-25 | Telefonaktiebolaget L M Ericsson | Overvoltage and overcurrent protective circuit with high earth balance |
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| CN201533160U (en) * | 2009-09-23 | 2010-07-21 | 深圳市槟城电子有限公司 | Anti-surge protection circuit |
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| CN107565510A (en) * | 2017-10-25 | 2018-01-09 | 上海长园维安电子线路保护有限公司 | A kind of circuit protecting device with excessively stream and over-voltage protecting function |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017032168A1 (en) | 2017-03-02 |
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