CN205123246U - ESD protector and mobile terminal - Google Patents
ESD protector and mobile terminal Download PDFInfo
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- CN205123246U CN205123246U CN201520859022.3U CN201520859022U CN205123246U CN 205123246 U CN205123246 U CN 205123246U CN 201520859022 U CN201520859022 U CN 201520859022U CN 205123246 U CN205123246 U CN 205123246U
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Abstract
The utility model relates to the field of communication, a ESD protector and mobile terminal is disclosed. The utility model discloses well ESD protector for the electrostatic discharge of antenna, its characterized in that contains: impedance conversion module and electrostatic discharge module, the electrostatic discharge module is connected through the excitation port of impedance conversion module and antenna. Make from the antenna end static of directly releasing, strengthen the ESD protection of system, the stability of improvement system.
Description
Technical field
The utility model relates to the communications field, particularly ESD protector and mobile terminal.
Background technology
Static discharge is considered to the maximum potential killer of Quality of electronic products, electrostatic defending also becomes the important content that Quality of electronic products controls, various electronic equipment all faces ESD (electro-staticdischarge, electrostatic leakage) protection question, especially wireless terminal, because antenna distance high-pressure electrostatic medium space length is nearer, in actual use, contact with people and the medium carrying high-pressure electrostatic around, cause inevitable electrostatic impact problem.
As everyone knows, along with the arrival in intelligence epoch, in wireless terminal, antenna gets more and more, and FPC and radium carving antenna are because the not high reason of the simple cost of technique is applied more and more widely, this kind of antenna is due to structurally closer to the charged medium in the external world, electronic circuit is directly connected with the RF front-end module of mainboard, had direct electrostatic leakage path by antenna to electronic circuit mainboard like this, so antenna itself, radio-frequency (RF) front-end circuit module and other circuit modules burn or damage easily via antenna by electrostatic.And general more common method has several as follows: 1. the ESD protection circuit increasing electronic devices and components itself; 2. increase ESD in the place of likely leaking electrostatic and protect disturbance means; 3. increase on PCB mainboard and leak copper ground connection, ensure that electrostatic has path of releasing fully; 4. increase the seal protection of electronic product machine shell, ensure that the high-pressure electrostatic that external medium is carried is difficult to enter the schemes such as inside modules.The scheme deficiency of these routines above-mentioned is; although structurally done sufficient protection and isolation electrostatic scheme; but because antenna is generally on the B shell of mobile phone; with back cover lean on very near; such electrostatic still leaks into mainboard easily via antenna area and burns antenna correlation module and circuit, causes whole system integrity problem.
Utility model content
The purpose of this utility model is to provide a kind of ESD protector and mobile terminal, makes from the direct static electricity discharge of antenna end, and the ESD protection of strengthening system, improves the stability of system.
For solving the problems of the technologies described above, execution mode of the present utility model provides a kind of ESD protector, for the electrostatic leakage of antenna, comprises: impedance transformation module and electrostatic leakage module; Described electrostatic leakage module is connected with the excitation port of described antenna by described impedance transformation module.
Of the present utility modelly embodiment further provides a kind of mobile terminal, comprise above-mentioned ESD protector.
The utility model execution mode in terms of existing technologies, the main distinction and effect thereof are: by the electrostatic leakage module be connected with antenna, directly release from the electrostatic of antenna, namely electrostatic is eliminated from electrostatic occurrence positions, further minimizing reaches the electrostatic of mainboard, the ESD protection of strengthening system.In addition, utilize the impedance transformation module of isolated antennas and electrostatic leakage module, ensure the normal work of antenna, improve the stability of system.
As further improvement, ESD protector comprises further: electrostatic identification module and switch module; Described electrostatic identification module, for detecting the electric charge of described sky line boundary; When high voltage electricity being detected, trigger electrostatic leakage module described in described switch module conducting and described impedance transformation module; Described switch module, after releasing in described electrostatic leakage module, disconnects described electrostatic leakage module and described impedance transformation module.
Utilize electrostatic identification module and switch module can control the conducting opportunity of electrostatic leakage module, when making to only have antenna to have electrostatic, just conducting electrostatic leakage module carries out electrostatic leakage, otherwise, just disconnect static leakage circuit, utilize that conducting is instantaneous releases, make to release more complete, and the conducting of electrostatic leakage module selective not only can reduce system power dissipation, the stability of system can also be ensured further.
As further improvement, electrostatic leakage module comprises several vent unit; Described vent unit comprises diode and the inductance of series connection; The input of described diode is the input of described vent unit, and one end of described inductance connects the output of described diode, other end ground connection.Utilize diode to ensure the directed flow of electric charge from antenna to ground, utilize inductance to ensure releasing of electric charge.
As further improvement, vent unit comprises electric capacity further; Described Capacitance parallel connection is at described inductance two ends.Utilize the self-charging of electric capacity to reduce the peak current of inductance, allow electrostatic release rapidly on the one hand, be unlikely to produce very large loss heat on the one hand in addition.
Accompanying drawing explanation
Fig. 1 is according to ESD protective device structure schematic diagram in the utility model first execution mode;
Fig. 2 is according to the impedance transformation module diagram in ESD protector in the utility model second execution mode;
Fig. 3 is according to the electrostatic leakage module diagram in ESD protector in the utility model second execution mode;
Fig. 4 is according to ESD protective device structure schematic diagram in the utility model the 3rd execution mode;
Fig. 5 is according to the electrostatic identification module in ESD protector in the utility model the 3rd execution mode and electrostatic leakage module diagram.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, each execution mode of the present utility model is explained in detail.But, persons of ordinary skill in the art may appreciate that in each execution mode of the utility model, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following execution mode and amendment, each claim of the application technical scheme required for protection also can be realized.
First execution mode of the present utility model relates to a kind of ESD protector, for the electrostatic leakage of antenna 10.Its structure as shown in Figure 1, specifically comprises: impedance transformation module 20 and electrostatic leakage module 30.
Wherein, electrostatic leakage module 30 is connected with the antenna 10 of mobile terminal by impedance transformation module 20, specifically, is be connected with the excitation port of antenna 10.Impedance transformation module 20, for the electrostatic charge on antenna 10 is reached electrostatic leakage module 30, also for isolated antennas 10 and electrostatic leakage module 30; Electrostatic leakage module 30, for releasing the electrostatic charge from antenna 10 to ground connection.
Present embodiment in terms of existing technologies, the main distinction and effect thereof are: by the electrostatic leakage module 30 be connected with antenna 10, directly release from the electrostatic of antenna 10, namely eliminate electrostatic from electrostatic occurrence positions, further minimizing reaches the electrostatic of mainboard, the ESD protection of strengthening system.In addition, utilize the impedance transformation module 20 of isolated antennas 10 and electrostatic leakage module 30, ensure the normal work of antenna 10, improve the stability of system.
It is worth mentioning that, each module involved in present embodiment is logic module, and in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.In addition, in order to outstanding innovative part of the present utility model, the unit not too close with solving technical problem relation that the utility model proposes is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.
Second execution mode of the present utility model relates to a kind of ESD protector equally.
Impedance transformation module 20 in present embodiment can as shown in Figure 2, and certainly, existing also have other implementations in actual applications, will not enumerate at this.
It should be noted that, as shown in Figure 3, electrostatic leakage module 30 comprise N number of vent unit (301,302 ..., 30N); Each vent unit comprises the diode D of series connection
nand inductance L
n, the input of diode is the input of vent unit, and one end of inductance connects the output of diode, other end ground connection; Wherein, N is natural number.Diode D
nmainly play the effect of directed conducting electric charge, inductance L
nrealize electrostatic charge to release fast on the ground.As vent unit more than one (N>2), this electrostatic leakage module 30 can ensure that discharging the instantaneous large-current of coming from antenna 10 divides equally each vent unit, ensures ESD protection fast.
Above-mentioned electrostatic leakage module 30 is only a kind of implementation in practical application, does not get rid of and can also adopt other existing implementations, will not enumerate at this.
In addition, present embodiment can also be optimized further, and vent unit can comprise electric capacity C further
n; Electric capacity C
nbe connected in parallel on inductance two ends.Electric capacity C
nflow through inductance L to ensure
nelectric current be in the more stable state of one, avoid instantaneous large-current to the impact of inductance, ensure electrostatic charge release effectively fast fall on the ground while reduce the thermal losses of inductance.
3rd execution mode of the present utility model relates to a kind of ESD protector equally, present embodiment is on the basis of the first execution mode, done further improvement, main improvements are: the electrostatic leakage module 30 of present embodiment not keeps the normality of access, but just access when electrostatic exists, carry out electrostatic leakage, keep the disconnection of electrostatic leakage module 30 when making electrostatic non-existent, not only can reduce system power dissipation, conducting moment can also be utilized, strengthen electrostatic leakage ability.
Utilize electrostatic identification module 50 and switch module 40 can control the conducting opportunity of electrostatic leakage module 30, when making to only have antenna 10 to have electrostatic, just conducting electrostatic leakage module 30 carries out electrostatic leakage, otherwise, just disconnect static leakage circuit, utilize that conducting is instantaneous releases, make to release more complete, and electrostatic leakage module 30 optionally conducting not only can reduce system power dissipation, the stability of system can also be ensured further.
Specifically, the ESD protector in present embodiment as shown in Figure 4, comprises further: electrostatic identification module 50 and switch module 40.
Specifically, one end of electrostatic identification module 50 connects antenna, other end connecting valve module 40; Electrostatic leakage module 30 is connected with impedance transformation module 20 by switch module 40.Electrostatic identification module 50, for detecting the electric charge on antenna 10 border; When high voltage electricity being detected, trigger switch module 40 conducting electrostatic leakage module 30 and impedance transformation module 20.Switch module 40, after releasing in electrostatic leakage module 30, disconnects electrostatic leakage module 30 and impedance transformation module 20.
It is worth mentioning that, the switch module 40 in present embodiment can be pulse power switch 401.In particular, pulse power switch 401 is IGBT (insulated gate polar form power tube) switch, as the N-type IGBT power switch be made up of insulated gate bipolar transistor, can produce very large electric current in the process of high-pressure electrostatic electric charge immediate leakage, the pulse switch that this technique is formed can afford the impact of big current and be unlikely to damage.When its grid-control voltage is high level time (U node high level), this switch open, drain-to-source conducting, provide the leakage path of an electric charge to impedance inverter circuit and charge discharging resisting array, namely charge discharging resisting path is opened; When the grid of this switch controls as time low level (U node low level), switch cuts out, and corresponding charge discharging resisting path turns off.Certainly, in actual applications, switch module 40 can also adopt other implementations, will not enumerate at this.
In addition, electrostatic identification module 50 can as shown in Figure 5, comprise: sample charge circuit 51, integrating amplification circuit 52 and reference ground 53, and one end of integrating amplification circuit 52 is connected with antenna 10 by reference to ground 53, and the other end connects sample charge circuit 51; Sample charge circuit 51 is connected with switch 401.Wherein, sample charge circuit 51, for when antenna 10 border exists high voltage electricity, forms high level signal; Also for utilizing high level signal trigger switch module 40 conducting electrostatic leakage module 30 and impedance transformation module 20.Utilize the high voltage electricity on negative input end reception antenna 10 border of integrating amplification circuit 52, export high level signal from its output.Under electrostatic identification module 50 utilizes high-pressure electrostatic effect, antenna 10 can form highfield instantaneously with the ground of its correspondence, thus inspire strong charge Q, now, quiet electrically excited charge Q is converted to voltage high level signal by the integrating amplification circuit 52 be made up of operational amplifier 501 and electric capacity 502 and electric capacity 503 on the grid U node of electrostatic power pulse switch 401, as the triggering of opening electrostatic pulse power switch 401, and voltage stabilizing didoe VD1 ensures that the voltage of U node can not cause because integrating circuit 52 causes too high voltage to export and burns pulse power switch 401, as schemed shown in upper dotted arrow, now, switch 401 is opened, electrostatic charge then on antenna 10 completes ESD protection in impedance transformation module 20 releases electrostatic leakage module 30 along the direction shown in solid arrow.Simultaneously, level voltage is dragged down by inductance 504 and electric capacity 505 due to the electric charge of accumulation by the voltage of U node, such switch M1 turns off, wherein, introduce the sample charge circuit 51 of inductance 504 and electric capacity 505 formation, its charge releasing time is greater than electrostatic charge TD release time shown in solid arrow, ensures that electrostatic fully leaks on the ground.When treating next electrostatic to attack, Controlling vertex U just becomes high level realization electrostatic esd protection next time from low level again.Wherein, operational amplifier 501 is exactly that real-time integration is amplified to more than the cut-in voltage Vth of power pulse switch 401, namely Vu>Vth from antenna 10 with reference to the charge Q sensed instantaneously between ground 53.
Certainly, above-mentioned sample charge circuit also has other implementations in actual applications, will not enumerate at this.
In actual applications, the ESD protector operation principle mentioned in present embodiment is as follows: the wait state that will enter antenna 10 electrostatic defending from initial state, go up whether there is highfield by detecting antenna 10 accordingly with it, if system is subject to the impact of high-pressure electrostatic, highfield will be formed, the self-starting of electrostatic defending identification circuit, the integrating circuit consisted of operational amplifier 501 can form high level at the grid of Pulse Width Control switch 401, thus electrostatic leakage module 30 works, impedance transformation module 20 realizes the abundant isolation of antenna 10 and electrostatic leakage module 30 simultaneously, realize effective protection of ESD, treat that electrostatic is fully released complete, integrating circuit exports and becomes low level state by releasing of sampled charge, whole system automatically restores to initial condition, wait to enter electrostatic defending next time, impact if system is not subject to high-pressure electrostatic, so highfield can not be formed, electrostatic leakage module 30 does not start, the grid of Pulse Width Control switch 401 keeps low level, whole electrostatic leakage module 30 keeps initial condition, can not produce interference to antenna 10, antenna 10 normally works, and waits for and enters electrostatic defending next time.
4th execution mode of the present utility model relates to a kind of mobile terminal.Specifically comprise the ESD protector as mentioned in the first execution mode, the second execution mode or the 3rd execution mode.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiment of the utility model, and in actual applications, various change can be done to it in the form and details, and do not depart from spirit and scope of the present utility model.
Claims (8)
1. an ESD protector, for the electrostatic leakage of antenna, is characterized in that, comprises: impedance transformation module and electrostatic leakage module;
Described electrostatic leakage module is connected with the excitation port of described antenna by described impedance transformation module.
2. ESD protector according to claim 1, is characterized in that, described ESD protector comprises further: electrostatic identification module and switch module;
One end of described electrostatic identification module connects described antenna, and the other end connects described switch module;
Described electrostatic leakage module is by described switch module and described impedance transformation model calling.
3. ESD protector according to claim 2, is characterized in that, described electrostatic identification module comprises: sample charge circuit, integrating amplification circuit and reference ground;
One end of described integrating amplification circuit is connected with described antenna with reference to ground by described, and the other end connects described sample charge circuit, and described sample charge circuit connects described switch module.
4. ESD protector according to claim 2, is characterized in that, described switch module is pulse power switch.
5. ESD protector according to claim 4, is characterized in that, described pulse power switch is insulated gate polar form power tube IGBT switch.
6. ESD protector according to claim 1, is characterized in that, described electrostatic leakage module comprises N number of vent unit; Described vent unit comprises diode and the inductance of series connection;
The input of described diode is the input of described vent unit, and one end of described inductance connects the output of described diode, other end ground connection;
Wherein, described N is natural number.
7. ESD protector according to claim 6, is characterized in that, described vent unit comprises electric capacity further; Described Capacitance parallel connection is at described inductance two ends.
8. a mobile terminal, is characterized in that, comprises ESD protector as claimed in any of claims 1 to 7 in one of claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520859022.3U CN205123246U (en) | 2015-10-30 | 2015-10-30 | ESD protector and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520859022.3U CN205123246U (en) | 2015-10-30 | 2015-10-30 | ESD protector and mobile terminal |
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| Publication Number | Publication Date |
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| CN205123246U true CN205123246U (en) | 2016-03-30 |
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| CN201520859022.3U Active CN205123246U (en) | 2015-10-30 | 2015-10-30 | ESD protector and mobile terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108241399A (en) * | 2016-12-27 | 2018-07-03 | 上海华虹集成电路有限责任公司 | Power consumption step suppression circuit |
-
2015
- 2015-10-30 CN CN201520859022.3U patent/CN205123246U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108241399A (en) * | 2016-12-27 | 2018-07-03 | 上海华虹集成电路有限责任公司 | Power consumption step suppression circuit |
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