CN106300311A - A kind of RC power supply clamp based on TVS diode - Google Patents
A kind of RC power supply clamp based on TVS diode Download PDFInfo
- Publication number
- CN106300311A CN106300311A CN201610739913.4A CN201610739913A CN106300311A CN 106300311 A CN106300311 A CN 106300311A CN 201610739913 A CN201610739913 A CN 201610739913A CN 106300311 A CN106300311 A CN 106300311A
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- China
- Prior art keywords
- phase inverter
- delay circuit
- tvs diode
- power supply
- circuit
- 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
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
Abstract
The invention discloses a kind of RC power supply clamp based on TVS diode, including being connected with power supply, for detecting whether there is electrostatic pulse, testing circuit electrostatic pulse sent when electrostatic pulse occurs on power supply；It is connected with testing circuit, for electrostatic pulse being postponed the delay circuit of output；It is connected with delay circuit, is used for absorbing electrostatic pulse, the TVS diode that electrostatic pulse is released.The clamping device that the present invention selects is TVS diode; owing to TVS diode itself need not antistatic; and there is the response time being exceedingly fast and at a relatively high surge absoption ability; with high speed, the high impedance at two ends can be become Low ESR when the two ends of TVS diode are by reverse moment overvoltage pulse; to absorb instantaneous large-current; and by voltage clamp at predetermined value; thus the components and parts in protection circuit sustain damage; TVS diode used herein is released ESD electric current as the clamping device of RC clamp circuit, enhances the safeguard function of circuit.
Description
Technical field
The present invention relates to electrostatic defending technical field, particularly relate to a kind of RC power supply based on TVS diode clamp electricity
Road.
Background technology
Due to development and the extensive application of integrated circuit of semiconductor technology, particularly the processing technique of MOS device is progressively
Become to take process technology as the leading factor so that the integrated level of device is greatly improved, also cause the device impact on electrostatic simultaneously
The most sensitive.Owing to electrostatic is very big to the harm of electronic product, therefore, the requirement for electrostatic defending is more and more higher.
Existing ESD (Electro-Static discharge, Electro-static Driven Comb) protection can use discrete component to build
ESD protection circuit, but ESD protection circuit of the prior art select clamping device be generally metal-oxide-semiconductor or common two poles
Pipe, crushing resistance is little, and earial drainage is slow.
Therefore, when how to provide a kind of clamp circuit solving above-mentioned technical problem, those skilled in the art are presently required solution
Problem certainly.
Summary of the invention
It is an object of the invention to provide a kind of RC power supply clamp based on TVS diode, crushing resistance is good, and earial drainage is fast,
Improve the security performance of whole circuit.
For solving above-mentioned technical problem, the invention provides a kind of RC power supply clamp based on TVS diode, bag
Include:
Be connected with power supply, be used for detecting on described power supply whether there is electrostatic pulse, when electrostatic pulse occurs by described
The testing circuit that electrostatic pulse sends；
It is connected with described testing circuit, for described electrostatic pulse being postponed the delay circuit of output；
It is connected with described delay circuit, is used for absorbing described electrostatic pulse, TVS bis-pole that described electrostatic pulse is released
Pipe.
Preferably, described testing circuit includes resistance and electric capacity, wherein, the first end of described resistance and the of described electric capacity
One end connects, and its common port the first end with described power supply and described delay circuit respectively is connected, the second end of described resistance
It is connected with the second end of described delay circuit, the second end of described electric capacity and the three-terminal link of described delay circuit.
Preferably, described delay circuit includes the first phase inverter and the second phase inverter, wherein, the of described first phase inverter
One end as the first end of described delay circuit, the second end of described first phase inverter as the second end of described delay circuit,
3rd end of described first phase inverter as the 3rd end of described delay circuit, the outfan of described first phase inverter and described the
The input of two phase inverters connects, and the outfan of described second phase inverter is connected with described TVS diode.
Preferably, described first phase inverter includes that an a NMOS and PMOS, described second phase inverter include second
NMOS and the 2nd PMOS, wherein:
The grid of a described NMOS is connected with the grid of a described PMOS, and its common port is as described delay circuit
First end, the drain electrode of a described NMOS is connected with the drain electrode of described 2nd NMOS as the second end of described delay circuit, institute
The drain electrode of the source electrode and a described PMOS of stating a NMOS is connected, and its common port connects with the input of described second phase inverter
Connect, the input of described second phase inverter be the grid of the grid of described 2nd NMOS and described 2nd PMOS connect public
End, the source electrode of a described PMOS is as the 3rd end ground connection of described delay circuit；The source ground of described 2nd PMOS, described
The source electrode of the 2nd NMOS is connected with the drain electrode of described 2nd PMOS, and its common port is as the outfan of described second phase inverter and institute
The anode stating TVS diode connects, the minus earth of described TVS diode.
The present invention provides a kind of RC power supply clamp based on TVS diode, including being connected with power supply, for detecting electricity
Electrostatic pulse, testing circuit electrostatic pulse sent when electrostatic pulse occurs whether is there is on source；With testing circuit
Connect, for electrostatic pulse being postponed the delay circuit of output；It is connected with delay circuit, is used for absorbing electrostatic pulse, by electrostatic
The TVS diode that pulse is released.The clamping device that the present invention selects is TVS diode, owing to TVS diode is compared with metal-oxide-semiconductor
Itself need not antistatic, and there is the response time being exceedingly fast and at a relatively high surge absoption ability, when the two of TVS diode
End can be become Low ESR with high speed the high impedance at two ends by during reverse moment overvoltage pulse, to absorb moment big electricity
Stream, and by voltage clamp at predetermined value, thus the components and parts in protection circuit sustain damage, TVS bis-pole used herein
Pipe is released ESD electric current as the clamping device of RC clamp circuit, and crushing resistance is good, and earial drainage is fast, enhances the safeguard function of circuit.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, below will be to institute in prior art and embodiment
The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only some enforcements of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtains according to these accompanying drawings
Obtain other accompanying drawing.
The structural representation of a kind of based on TVS diode the RC power supply clamp that Fig. 1 provides for the present invention.
Detailed description of the invention
The core of the present invention is to provide a kind of RC power supply clamp based on TVS diode, and crushing resistance is good, and earial drainage is fast,
Improve the security performance of whole circuit.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
The a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under not making creative work premise, broadly falls into the scope of protection of the invention.
The structure that refer to a kind of based on TVS diode the RC power supply clamp that Fig. 1, Fig. 1 provide for the present invention is shown
Being intended to, this circuit includes:
Be connected with power supply, be used for detecting on power supply whether there is electrostatic pulse, when electrostatic pulse occurs by electrostatic pulse
The testing circuit 1 sent；
As preferably, testing circuit 1 includes resistance and electric capacity, and wherein, the first end of resistance and the first end of electric capacity are even
Connecing, its common port the first end with power supply and delay circuit 2 respectively is connected, the second end of resistance and the second of delay circuit 2
End connects, the second end of electric capacity and the three-terminal link of delay circuit 2.
It is understood that testing circuit 1 is used for detecting the generation of ESD situation on power supply, in actual applications, powering on
Moment or imprudence are all likely to occur electrostatic pulse when touching the pin in circuit.
It addition, the application is to use RC circuit as testing circuit 1 to detect electrostatic pulse, it is also possible to use other to detect
Circuit detects, and the present invention is not particularly limited at this, determines according to practical situation.
It is connected with testing circuit 1, for electrostatic pulse being postponed the delay circuit 2 of output；
As preferably, delay circuit 2 includes the first phase inverter 21 and the second phase inverter 22, wherein, the first phase inverter 21
The first end as the first end of delay circuit 2, the second end of the first phase inverter 21 as the second end of delay circuit 2, first
3rd end of phase inverter 21 as the 3rd end of delay circuit 2, the outfan of the first phase inverter 21 and the second phase inverter 22 defeated
Entering end to connect, the outfan of the second phase inverter 22 is connected with TVS diode 3.
It is understood that delay circuit 2 is used for ensureing to be found and by the whole mistake of earial drainage in whole electrostatic pulse
Journey makes TVS diode 3 be in the state of disconnection all the time, ensure that TVS diode 3 does not affect the normal work of integrated circuit with this
Make.
Specifically, when there is ESD event, electrostatic pulse is detected by testing circuit 1, now after R, C
Logic level is changed to " 1 ", and afterwards through the first phase inverter 21 and delay of the second phase inverter 22, logic level remains as " 1 ",
Now TVS diode 3 is unlocked, the electric current of electrostatic pulse of releasing.
As preferably, the first phase inverter 21 includes that an a NMOS and PMOS, the second phase inverter 22 include second
NMOS and the 2nd PMOS, wherein:
The grid of the grid of the oneth NMOS and a PMOS connects, its common port as the first end of delay circuit 2, first
The drain electrode of NMOS connects as the second end of delay circuit 2 and the drain electrode of the 2nd NMOS, the source electrode of a NMOS and a PMOS
Drain electrode connect, the connection of the input of its common port and the second phase inverter 22, the input of the second phase inverter 22 is the 2nd NMOS
Grid and the 2nd PMOS grid connect common port, the source electrode of a PMOS is as the 3rd end ground connection of delay circuit 2；
The source ground of the 2nd PMOS, the source electrode of the 2nd NMOS and the drain electrode of the 2nd PMOS connect, and its common port is as the second phase inverter
The outfan of 22 is connected with the anode of TVS diode 3, the minus earth of TVS diode 3.
The one of above-mentioned simply the first phase inverter 21 that the present invention provides and the second phase inverter 22 implements form, this
Bright can be to use the phase inverter of other forms, the present invention the most particularly limits at this, can realize the purpose of the present invention.
Be connected with delay circuit 2, for absorbing electrostatic pulse, the TVS diode 3 that electrostatic pulse is released.
Specifically, TVS diode 3 has the clamp function of brilliance, extremely low breakdown voltage, minimum encapsulation, electrically spy
Property is more stable in life cycle.On the one hand, TVS diode 3 is swift in response, and crushing resistance is good, makes instantaneous electrostatic pulse not have
Having before circuit or device are caused damage and just can effectively be contained, on the other hand, the blanking voltage ratio of TVS is relatively low, suitableeer
For low-voltage circuit environment.
The present invention provides a kind of RC power supply clamp based on TVS diode, including being connected with power supply, for detecting electricity
Electrostatic pulse, testing circuit electrostatic pulse sent when electrostatic pulse occurs whether is there is on source；With testing circuit
Connect, for electrostatic pulse being postponed the delay circuit of output；It is connected with delay circuit, is used for absorbing electrostatic pulse, by electrostatic
The TVS diode that pulse is released.The clamping device that the present invention selects is TVS diode, owing to TVS diode is compared with metal-oxide-semiconductor
Itself need not antistatic, and there is the response time being exceedingly fast and at a relatively high surge absoption ability, when the two of TVS diode
End can be become Low ESR with high speed the high impedance at two ends by during reverse moment overvoltage pulse, to absorb moment big electricity
Stream, and by voltage clamp at predetermined value, thus the components and parts in protection circuit sustain damage, TVS bis-pole used herein
Pipe is released ESD electric current as the clamping device of RC clamp circuit, and crushing resistance is good, and earial drainage is fast, enhances the safeguard function of circuit.
It should be noted that in this manual, the relational terms of such as first and second or the like is used merely to one
Individual entity or operation separate with another entity or operating space, and not necessarily require or imply these entities or operate it
Between exist any this reality relation or order.And, term " includes ", " comprising " or its any other variant are intended to
Contain comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include those
Key element, but also include other key elements being not expressly set out, or also include for this process, method, article or set
Standby intrinsic key element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that
Other identical element is there is also in including the process of described key element, method, article or equipment.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and features of novelty phase one
The widest scope caused.
Claims (4)
1. a RC power supply clamp based on TVS diode, it is characterised in that including:
Be connected with power supply, be used for detecting on described power supply whether there is electrostatic pulse, when electrostatic pulse occurs by described electrostatic
The testing circuit that pulsing is gone out；
It is connected with described testing circuit, for described electrostatic pulse being postponed the delay circuit of output；
It is connected with described delay circuit, is used for absorbing described electrostatic pulse, the TVS diode described electrostatic pulse released.
2. RC power supply clamp as claimed in claim 1, it is characterised in that described testing circuit includes resistance and electric capacity,
Wherein, the first end of the first end of described resistance and described electric capacity connects, its common port respectively with described power supply and described in prolong
First end of circuit connects late, and the second end of described resistance is connected with the second end of described delay circuit, the second of described electric capacity
End and the three-terminal link of described delay circuit.
3. RC power supply clamp as claimed in claim 2, it is characterised in that described delay circuit include the first phase inverter and
Second phase inverter, wherein, the first end of described first phase inverter is as the first end of described delay circuit, described first phase inverter
The second end as the second end of described delay circuit, the 3rd end of described first phase inverter is as the 3rd of described delay circuit
End, the outfan of described first phase inverter is connected with the input of described second phase inverter, the outfan of described second phase inverter
It is connected with described TVS diode.
4. RC power supply clamp as claimed in claim 3, it is characterised in that described first phase inverter include a NMOS and
Oneth PMOS, described second phase inverter includes the 2nd NMOS and the 2nd PMOS, wherein:
The grid of a described NMOS is connected with the grid of a described PMOS, and its common port is as the first of described delay circuit
End, the drain electrode of a described NMOS is connected with the drain electrode of described 2nd NMOS as the second end of described delay circuit, and described the
The source electrode of one NMOS is connected with the drain electrode of a described PMOS, and its common port is connected with the input of described second phase inverter, institute
The common port that the grid of the grid that input is described 2nd NMOS and described 2nd PMOS of stating the second phase inverter connects, institute
State the source electrode the 3rd end ground connection as described delay circuit of a PMOS；The source ground of described 2nd PMOS, described second
The source electrode of NMOS is connected with the drain electrode of described 2nd PMOS, its common port as the outfan of described second phase inverter with described
The anode of TVS diode connects, the minus earth of described TVS diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610739913.4A CN106300311A (en) | 2016-08-27 | 2016-08-27 | A kind of RC power supply clamp based on TVS diode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610739913.4A CN106300311A (en) | 2016-08-27 | 2016-08-27 | A kind of RC power supply clamp based on TVS diode |
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| Publication Number | Publication Date |
|---|---|
| CN106300311A true CN106300311A (en) | 2017-01-04 |
Family
ID=57677304
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610739913.4A Pending CN106300311A (en) | 2016-08-27 | 2016-08-27 | A kind of RC power supply clamp based on TVS diode |
Country Status (1)
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| CN (1) | CN106300311A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298260A (en) * | 2018-09-28 | 2019-02-01 | 出门问问信息科技有限公司 | Electronic equipment, electrostatic detection structure and method |
| WO2019119980A1 (en) * | 2017-12-20 | 2019-06-27 | 广东美的制冷设备有限公司 | Electrostatic protection circuit, integrated circuit chip, and household appliance |
| CN111193249A (en) * | 2020-01-06 | 2020-05-22 | 西安理工大学 | Clamping circuit capable of being used for electrostatic discharge and surge protection simultaneously |
| CN112491021A (en) * | 2020-11-16 | 2021-03-12 | 中国科学院微电子研究所 | Silicon-on-insulator circuit electrostatic discharge protection clamping circuit |
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| CN103515944A (en) * | 2013-10-14 | 2014-01-15 | 辽宁大学 | Power Clamp for ESD protection between power supply and ground by adopting dual-channel technology |
| CN103872670A (en) * | 2012-12-07 | 2014-06-18 | 创杰科技股份有限公司 | Electrostatic discharge protection circuit, bias circuit and electronic device |
| CN105514963A (en) * | 2016-01-27 | 2016-04-20 | 京东方科技集团股份有限公司 | Electrostatic protection circuit and liquid crystal display module provided with same |
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2016
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Patent Citations (6)
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| US6529359B1 (en) * | 1999-08-06 | 2003-03-04 | Sarnoff Corporation | Circuits for dynamic turn off of NMOS output drivers during EOS/ESD stress |
| CN101707363A (en) * | 2009-07-22 | 2010-05-12 | 彩优微电子(昆山)有限公司 | Electrostatic damage protection circuit having real-time detection function, and control method thereof |
| CN101997311A (en) * | 2009-08-19 | 2011-03-30 | 株式会社理光 | Electrostatic discharge protection circuit, control method therefor, and switching regulator using same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019119980A1 (en) * | 2017-12-20 | 2019-06-27 | 广东美的制冷设备有限公司 | Electrostatic protection circuit, integrated circuit chip, and household appliance |
| CN109298260A (en) * | 2018-09-28 | 2019-02-01 | 出门问问信息科技有限公司 | Electronic equipment, electrostatic detection structure and method |
| CN111193249A (en) * | 2020-01-06 | 2020-05-22 | 西安理工大学 | Clamping circuit capable of being used for electrostatic discharge and surge protection simultaneously |
| CN111193249B (en) * | 2020-01-06 | 2022-02-22 | 西安理工大学 | Clamping circuit capable of being used for electrostatic discharge and surge protection simultaneously |
| CN112491021A (en) * | 2020-11-16 | 2021-03-12 | 中国科学院微电子研究所 | Silicon-on-insulator circuit electrostatic discharge protection clamping circuit |
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Application publication date: 20170104 |