CN206962436U - Protection circuit, equipment and communication system - Google Patents
Protection circuit, equipment and communication system Download PDFInfo
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- CN206962436U CN206962436U CN201720757894.8U CN201720757894U CN206962436U CN 206962436 U CN206962436 U CN 206962436U CN 201720757894 U CN201720757894 U CN 201720757894U CN 206962436 U CN206962436 U CN 206962436U
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Abstract
The utility model embodiment provides a kind of protection circuit, equipment and communication system.The protection circuit includes：Transient voltage suppresses TVS diode, resistance and electric capacity；Wherein, the first end of the TVS diode is connected with one end of the resistance at the first tie point；The second end ground connection of the TVS diode；One end of the electric capacity is connected with the other end of the resistance at the second tie point；The other end of the electric capacity is connected with the second end of the TVS diode.The utility model embodiment can effectively remain the signal integrity of communication transmission signal while static electricity discharge.
Description
Technical field
The utility model embodiment is related to circuit protective device technical field, more particularly to a kind of protection circuit, equipment and
Communication system.
Background technology
Transient voltage suppresses (Transient Voltage Suppressor, abbreviation TVS) diode, is a kind of diode
The high-effect protection device of form.When the two poles of the earth of TVS diode are by reverse transient state high energy impact events, TVS diode can be with
The speed of 10 minus 12 power second-time, the high impedance of its two interpolar is changed into Low ESR, absorbs up to thousands of watts of surge work(
Rate, the voltage clamp of two interpolars is set the precision components in electronic circuit effectively to be protected, from various waves in a predetermined value
Gush the damage of pulse.
However, when existing TVS diode is used in the COM1 of all kinds of chips at present, have because it absorbs instantaneous power
Limit, therefore the unkehr effect occurred due to huge earth-current surge can not be handled, it can not also handle due to huge surge
When influenceing make it that transient voltage is too high, the phenomenon for the transmission signal confusion that chip occurs.
Utility model content
The utility model embodiment provides a kind of protection circuit, equipment and communication system, existing for solving prior art
TVS diode be used in all kinds of chips COM1 when, the reverse occurred due to huge earth-current surge can not be handled
Effect, it can not also handle because when huge surge influences make it that transient voltage is too high, the signal that chip occurs when handling is chaotic
Phenomenon technical problem.
In a first aspect, the utility model embodiment provides a kind of protection circuit, including：
Transient voltage suppresses TVS diode, resistance and electric capacity；
Wherein, the first end of the TVS diode is connected with one end of the resistance at the first tie point；The TVS
The second end ground connection of diode；
One end of the electric capacity is connected with the other end of the resistance at the second tie point；The other end of the electric capacity with
The second end connection of the TVS diode.
In a kind of possible implementation of first aspect, the TVS diode is unidirectional TVS diode or two-way
TVS diode.
In the alternatively possible implementation of first aspect, when the TVS diode is unidirectional TVS diode, institute
The first end for stating TVS diode is negative pole；Second end of the TVS diode is positive pole.
In the alternatively possible implementation of first aspect, the model ZPD27 of the TVS diode；The electricity
The resistance of resistance is 715 Ω；The capacitance of the electric capacity is 1uF.
Second aspect, the utility model embodiment provide a kind of electronic equipment, including：
Communication interface, and the protection circuit as described in any one of first aspect；
Wherein, one end of the communication interface is connected with the second tie point of the protection circuit.
In a kind of possible implementation of two aspects, in addition to：
Processor, it is connected with the other end of the communication interface.
The third aspect, the utility model embodiment provide a kind of external equipment, including：
Communication interface, and the protection circuit as described in any one of first aspect；
Wherein, one end of the communication interface is connected with the first tie point of the protection circuit.
Fourth aspect, the utility model embodiment provide a kind of communication system, including：
Electronic equipment as described in second aspect, and external equipment；
Wherein, the communication interface of the external equipment is connected with the first tie point of the protection circuit.
5th aspect, the utility model embodiment provide a kind of communication system, including：
Electronic equipment, and the external equipment as described in the third aspect；
Wherein, the communication interface of the electronic equipment is connected with the second tie point of the protection circuit.
6th aspect, the utility model embodiment provide a kind of communication system, including：
Electronic equipment, external equipment and the protection circuit as described in any one of first aspect；
Wherein, the communication interface of the electronic equipment is connected with the second tie point of the protection circuit；
The communication interface of the external equipment is connected with the first tie point of the protection circuit.
Protection circuit, equipment and the communication system that the utility model embodiment provides, protection circuit, including：Transient voltage
Suppress TVS diode, resistance and electric capacity；Wherein, the first end of the TVS diode is connected with one end of the resistance first
Connected at point；The second end ground connection of the TVS diode；One end of the electric capacity is connected with the other end of the resistance second
Connected at point；The other end of the electric capacity is connected with the second end of the TVS diode, and TVS diode is used to absorb and let out anti-
Most energy of electrostatic, electric capacity can absorb the portion of energy of electrostatic, and resistance R1 and electric capacity C1 can form RC filtered electricals
Road is filtered to transmission signal, keeps the integrality of communication transmission signal, therefore above-mentioned protection circuit can effectively let out
The signal integrity of communication transmission signal is remain while electrostatic discharge.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, drawings in the following description are
Some embodiments of the utility model, for those of ordinary skill in the art, do not paying the premise of creative labor
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the embodiment of protection circuit one provided by the utility model；
Fig. 2 is the structural representation that communication system provided by the utility model unifies embodiment；
Fig. 3 is the structural representation of the embodiment of electronic equipment one provided by the utility model；
Fig. 4 is the structural representation of another embodiment of electronic equipment provided by the utility model；
Fig. 5 is the structural representation of the embodiment of external equipment one provided by the utility model；
Fig. 6 is the structural representation of another embodiment of communication system provided by the utility model；
Fig. 7 is the structural representation of the another embodiment of communication system provided by the utility model.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is belonged to
The scope of the utility model protection.
Term " first ", " second " in specification and claims of the present utility model and above-mentioned accompanying drawing etc. (if
In the presence of) it is for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use
Data can exchange in the appropriate case, so as to embodiment of the present utility model described herein, for example, can with except
Here the order beyond those for illustrating or describing is implemented.In addition, term " comprising " and " having " and their any deformation,
Be intended to cover it is non-exclusive include, for example, containing the process of series of steps or unit, method, system, product or setting
Standby those steps or the unit for being not necessarily limited to clearly list, but may include not list clearly or for these mistakes
The intrinsic other steps of journey, method, product or equipment or unit.
The electronic equipment that the utility model embodiment is related to can be any fixation, movement or portable electric appts, wrap
Include but be not limited to computer, communication equipment, tablet personal computer, smart mobile phone etc..
The external equipment that the utility model embodiment is related to referred to as " peripheral hardware ", refers to be connected in the electricity such as computer, communication equipment
Hardware device beyond sub- equipment.Data and information are played a part of with transmission, transfers and stores, is that computer, communication etc. are
Important component in system.
Surge is the common cause for causing electronic equipment to damage.Surge is a kind of violent arteries and veins occurred within the Microsecond grade time
Punching, seriously beyond normal working voltage.
Influence of the surge to sensitive electron electric equipment includes：Cause electronic equipment internal device power source end, signal input
There is too high voltage in output end moment, destroys component metallization top layer, or even breakdown voltage semiconductor device；Transient voltage may
Make complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, abbreviation CMOS) device
It is out of control Deng element, cause device to work in abnormal condition, device is passed through super-high-current to burn；Overvoltage can destroy printing
Circuit board trace road or contact point；The voltage pulsation of moment can interfere to electronic equipment, make the mistake of communication transmitting data
By mistake, data processor error, data file portion are destroyed；Frequently overvoltage can cause device aging to accelerate, and greatly shorten
Equipment life.
Currently, for protection equipment from the influence of electrostatic surge, widely used TVS diode.The TVS diode device can
To be connected in parallel on equipment incoming line both ends, very big impedance is presented when line voltage distribution is in normal range (NR), works as surge voltage
During into equipment, line voltage distribution exceedes tolerance limit, device resistance rapid decrease, surge current is absorbed, to ensure that line voltage distribution is unlikely
In too high.But its absorption instantaneous power is limited, and in high current, easily excessively stream is burnt in the case of.
The problem of for existing TVS diode, the application propose a kind of protection circuit, including TVS diode, resistance and
Electric capacity, the signal integrity of signal of communication can be effectively remain while static electricity discharge, allow including electronic equipment and
The whole communication system of peripheral hardware can be more sane work.
The technical solution of the utility model is described in detail with specifically embodiment below.These are specific below
Embodiment can be combined with each other, and may be repeated no more for same or analogous concept or process in some embodiments.
Fig. 1 is the structural representation of the embodiment of protection circuit one provided by the utility model.Fig. 2 provides for the utility model
Communication system unify the structural representation of embodiment.As shown in figure 1, the protection circuit of the present embodiment, can include：
TVS diode D1, resistance R1 and electric capacity C1；
Wherein, the first end of the TVS diode and one end of the resistance connect at the first tie point a1；It is described
The second end ground connection of TVS diode；
One end of the electric capacity and the other end of the resistance connect at the second tie point a2；The other end of the electric capacity
It is connected with the second end of the TVS diode.
Specifically, in the present embodiment, protection circuit, mainly it is made up of three parts：(1) TVS diode D1, for absorbing
With the most energy for letting out antistatic；(2) resistance R1；(3) electric capacity C1.
Wherein, resistance R1 and electric capacity C1, for forming single order RC filter circuits, that is, low pass filter is formed.
As shown in Fig. 2 the protection circuit of the present embodiment can be connected to external equipment and electronic equipment communication interface it
Between, the communication interface of external equipment is connected at the first tie point a1 of protection circuit, and the communication interface of electronic equipment is connected to
At second tie point a2 of protection circuit, for carrying out surge protection to the communication interface of external equipment and electronic equipment.
The operation principle of above-mentioned protection circuit is as follows：
TVS diode D1 impedance is very big under normal operating conditions, and basic no current passes through；When there is surge pulse,
With the quick rise of input voltage, TVS diode D1 impedance reduces, and pressure drop reduces, and counteracts a part of surge voltage
Influence, electric capacity can also suppress voltage jump, can absorb the portion of energy of electrostatic.Influence to cause wink due to huge surge
Between overtension when, when transmission signal confusion phenomena occurring between the communication interface of communication system, above-mentioned resistance R1 and electric capacity C1
The RC filter circuits of composition are filtered to transmission signal, keep the integrality of communication transmission signal.
Electric capacity C1 can keep the stability of signal of communication relatively partly.
Resistance R1 contributes to the stabilization on ground.
In the present embodiment, protection circuit is formed by the way that above three device is packaged together, can effectively released
The signal integrity of communication transmission signal is remain while electrostatic, allows the work that whole communication system can be more sane.
The protection circuit that the present embodiment provides, including：Transient voltage suppresses TVS diode, resistance and electric capacity；Wherein, institute
The first end for stating TVS diode is connected with one end of the resistance at the first tie point；Second termination of the TVS diode
Ground；One end of the electric capacity is connected with the other end of the resistance at the second tie point；The other end of the electric capacity with it is described
The second end connection of TVS diode, TVS diode are used for the most energy for absorbing and letting out antistatic, and electric capacity can absorb
The portion of energy of electrostatic, resistance R1 and electric capacity C1 can form RC filter circuits and transmission signal are filtered, and keep communication to pass
The integrality of defeated signal, therefore above-mentioned protection circuit effectively can remain communication transmission signal while static electricity discharge
Signal integrity.
Further, alternatively, on the basis of above-described embodiment, the TVS diode is unidirectional TVS diode or double
To TVS diode.
The V-I characteristics of unidirectional TVS diode, unidirectional TVS forward characteristic is identical with common voltage-regulator diode, reverse breakdown
Flex point approximation " right angle " is hard breakdown, is typical PN junction avalanche device.Clamped from breakdown point to maximum corresponding to voltage vc value
Curved section show, when there is instantaneous overvoltage pulse, the hurried increase of the electric current of device and backward voltage then rises to clamp voltage
Value, and be maintained in this level.
Two-way TVS V-I characteristics, two-way TVS V-I characteristic curves are such as two unidirectional " back-to-back " combinations of TVS, and it is just
Anti- both direction all has identical avalanche breakdown characteristic and clamping factor, once the interference voltage for being added in its both ends exceedes clamp
Voltage Vc will be suppressed at once.
When from TVS diode, following principal element is considered as：
(1), should if TVS diode is possible to bear peaking voltage (surge voltage) impact from both direction
It is two-way when selecting, otherwise it can be selected unidirectionally.
(2) the maximum clamp voltage vc value of TVS diode selected by should be less than the ceiling voltage of protected element.Vc is two
Pole pipe cut-off state voltage, that is, Electro-static Driven Comb (Electro-Static discharge, abbreviation ESD) impact shape
By the voltage of TVS diode during state, it can not be more than by the limiting voltage that bears of protective loop, and otherwise device faces and damaged
Bad danger.
Wherein, when the TVS diode is unidirectional TVS diode, the first end of the TVS diode is negative pole；It is described
Second end of TVS diode is positive pole.
Wherein, in actual applications, in a kind of enforceable mode, the model ZPD27 of the TVS diode；It is described
The resistance of resistance is 715 Ω；The capacitance of the electric capacity is 1uF.
It should be noted that the model of above-mentioned TVS diode, the resistance of resistance, the capacitance of electric capacity are merely possible to one
Kind example illustrates, and in actual applications, can be chosen according to real needs, the utility model is not limited this.
Fig. 3 is the structural representation of the embodiment of electronic equipment one provided by the utility model.As shown in figure 3, the present embodiment
Electronic equipment, can include：
Communication interface, and the protection circuit as described in above-mentioned embodiment；
Wherein, one end of the communication interface is connected with the second tie point a2 of the protection circuit.
The electronic equipment that the present embodiment provides, including：Communication interface and protection circuit, the protection circuit include：Transient state
Voltage suppresses TVS diode, resistance and electric capacity；Wherein, one end of the first end of the TVS diode and the resistance is first
Connected at tie point；The second end ground connection of the TVS diode；The other end of one end of the electric capacity and the resistance is second
Connected at tie point；The other end of the electric capacity is connected with the second end of the TVS diode, TVS diode be used for absorb and
Most energy of antistatic are let out, electric capacity can absorb the portion of energy of electrostatic, and resistance R1 and electric capacity C1 can form RC filters
Wave circuit is filtered to transmission signal, keeps the integrality of communication transmission signal, therefore the protection circuit of above-mentioned electronic equipment
The signal integrity of communication transmission signal can be effectively remain while static electricity discharge.
Fig. 4 is the structural representation of another embodiment of electronic equipment provided by the utility model.In the structure base shown in Fig. 3
On plinth, optionally, as a kind of enforceable mode, electronic equipment can also include：
Processor, it is connected with the other end of the communication interface.
Wherein, processor can be made up of integrated circuit (Integrated Circuit, abbreviation IC), such as can be by list
Encapsulation IC formed, can also by connection more identical functions or difference in functionality encapsulation IC and form.For example, locate
Reason device can only include CPU or MCU or graphics processor (Graphic Processing Unit；GPU), numeral letter
Number processor (Digital Signal Processor；DSP control chip (such as baseband chip)) and in communication unit
Combination.
Fig. 5 is the structural representation of the embodiment of external equipment one provided by the utility model.As shown in figure 5, the present embodiment
External equipment, can include：
Communication interface, and the protection circuit described in embodiment as shown in Figure 1；
Wherein, one end of the communication interface is connected with the first tie point a1 of the protection circuit.
The external equipment that the present embodiment provides, including：Communication interface and protection circuit, the protection circuit include：Transient state
Voltage suppresses TVS diode, resistance and electric capacity；Wherein, one end of the first end of the TVS diode and the resistance is first
Connected at tie point；The second end ground connection of the TVS diode；The other end of one end of the electric capacity and the resistance is second
Connected at tie point；The other end of the electric capacity is connected with the second end of the TVS diode, TVS diode be used for absorb and
Most energy of antistatic are let out, electric capacity can absorb the portion of energy of electrostatic, and resistance R1 and electric capacity C1 can form RC filters
Wave circuit is filtered to transmission signal, keeps the integrality of communication transmission signal, therefore the protection circuit of said external equipment
The signal integrity of communication transmission signal can be effectively remain while static electricity discharge.
Fig. 6 is the structural representation of another embodiment of communication system provided by the utility model.As shown in figure 5, this implementation
The communication system of example, including：
Electronic equipment described in embodiment as shown in Figure 3, Figure 4, and external equipment；
Wherein, the communication interface of the external equipment is connected with the first tie point a1 of the protection circuit.
Fig. 7 is the structural representation of the another embodiment of communication system provided by the utility model.As shown in fig. 7, this implementation
The communication system of example, including：
Electronic equipment, and the external equipment described in embodiment as shown in Figure 5；
Wherein, the communication interface of the electronic equipment is connected with the second tie point a2 of the protection circuit.
As shown in Fig. 2 the communication system of the present embodiment, including：
Protection circuit described in electronic equipment, external equipment and embodiment as shown in Figure 1；
Wherein, the communication interface of the electronic equipment is connected with the second tie point of the protection circuit；
The communication interface of the external equipment is connected with the first tie point of the protection circuit.
The communication system that the present embodiment provides, including：Electronic equipment, external equipment and protection circuit, the protection circuit
Including：Transient voltage suppresses TVS diode, resistance and electric capacity；Wherein, the first end of the TVS diode and the resistance
One end connects at the first tie point；The second end ground connection of the TVS diode；One end of the electric capacity is another with the resistance
One end connects at the second tie point；The other end of the electric capacity is connected with the second end of the TVS diode, TVS diode
For absorbing and letting out most energy of antistatic, electric capacity can absorb the portion of energy of electrostatic, and resistance R1 and electric capacity C1 can
Transmission signal is filtered with forming RC filter circuits, keeps the integrality of communication transmission signal, therefore can effectively exist
The signal integrity of communication transmission signal is remain while static electricity discharge, allows the work that whole communication system can be more sane
Make.
The communication system of above-described embodiment, the technical side of its implementing principle and technical effect and above-mentioned protection circuit embodiment
Case is similar, and its specific implementation process may refer to previous embodiment, and here is omitted.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
- A kind of 1. protection circuit, it is characterised in that including：Transient voltage suppresses TVS diode, resistance and electric capacity；Wherein, the first end of the TVS diode is connected with one end of the resistance at the first tie point；The poles of TVS bis- The second end ground connection of pipe；One end of the electric capacity is connected with the other end of the resistance at the second tie point；The other end of the electric capacity with it is described The second end connection of TVS diode.
- 2. circuit according to claim 1, it is characterised in that the TVS diode is unidirectional TVS diode or two-way TVS diode.
- 3. circuit according to claim 2, it is characterised in that described when the TVS diode is unidirectional TVS diode The first end of TVS diode is negative pole；Second end of the TVS diode is positive pole.
- 4. according to the circuit described in claim any one of 1-3, it is characterised in that the model ZPD27 of the TVS diode； The resistance of the resistance is 715 Ω；The capacitance of the electric capacity is 1uF.
- 5. a kind of electronic equipment, it is characterised in that including：Communication interface, and the protection circuit as described in claim any one of 1-4；Wherein, one end of the communication interface is connected with the second tie point of the protection circuit.
- 6. equipment according to claim 5, it is characterised in that also include：Processor, it is connected with the other end of the communication interface.
- A kind of 7. external equipment, it is characterised in that including：Communication interface, and the protection circuit as described in claim any one of 1-4；Wherein, one end of the communication interface is connected with the first tie point of the protection circuit.
- A kind of 8. communication system, it is characterised in that including：Electronic equipment as described in claim 5 or 6, and external equipment；Wherein, the communication interface of the external equipment is connected with the first tie point of the protection circuit.
- A kind of 9. communication system, it is characterised in that including：Electronic equipment, and external equipment as described in claim 7；Wherein, the communication interface of the electronic equipment is connected with the second tie point of the protection circuit.
- A kind of 10. communication system, it is characterised in that including：Electronic equipment, external equipment and the protection circuit as described in claim any one of 1-4；Wherein, the communication interface of the electronic equipment is connected with the second tie point of the protection circuit；The communication interface of the external equipment is connected with the first tie point of the protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720757894.8U CN206962436U (en) | 2017-06-27 | 2017-06-27 | Protection circuit, equipment and communication system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720757894.8U CN206962436U (en) | 2017-06-27 | 2017-06-27 | Protection circuit, equipment and communication system |
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| Publication Number | Publication Date |
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| CN206962436U true CN206962436U (en) | 2018-02-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196280A (en) * | 2017-06-27 | 2017-09-22 | 深圳市泰衡诺科技有限公司上海分公司 | Protection circuit, equipment and communication system |
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2017
- 2017-06-27 CN CN201720757894.8U patent/CN206962436U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196280A (en) * | 2017-06-27 | 2017-09-22 | 深圳市泰衡诺科技有限公司上海分公司 | Protection circuit, equipment and communication system |
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