CN206164086U - Electrostatic protection circuit - Google Patents
Electrostatic protection circuit Download PDFInfo
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- CN206164086U CN206164086U CN201620777576.3U CN201620777576U CN206164086U CN 206164086 U CN206164086 U CN 206164086U CN 201620777576 U CN201620777576 U CN 201620777576U CN 206164086 U CN206164086 U CN 206164086U
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- protection circuit
- clamp diode
- electrostatic discharge
- discharge protection
- diode
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Abstract
The utility model relates to an electrostatic protection field especially relates to an electrostatic protection circuit, it is including a parallelly connected catching diode and the 2nd catching diode, wherein, parallelly connected a catching diode with the 2nd catching diode's plus earth, negative pole are connected to one and receive the protection circuit. The utility model discloses a catching diode and the 2nd catching diode's common protection can be controlled the residual voltage of static incident enough lowly, and a catching diode and the 2nd catching diode have fast (the average response time <of response speed, 25nS), switches on impedance and on -state voltage is little and low (the lou dianliu <of leakage current, 1 mu A) characteristics such as.
Description
Technical field
The utility model is related to electrostatic defending field, more particularly to a kind of electrostatic discharge protection circuit.
Background technology
Current many electronic consumer products can all be subject to when in use ESD（Electro-Static discharge, it is quiet
Discharge of electricity）The interference of event, and due to system IC（Integrated circuit, integrated circuit）Technique progress（Technology section
Point≤14 nanometer）, HBM（Human-Body Model, human-body model）Pressure≤700V, traditional electrostatic discharge protection circuit
Design pattern can still leave higher residual voltage and be delivered to circuit system, when circuit system cannot be resistance to when esd event is met with
During by higher residual voltage, will damage.
Accordingly, it would be desirable to design it is a can still can be with when the energy by esd event bombards with effective protection circuit system
The electrostatic discharge protection circuit of normal work.
Utility model content
In view of above-mentioned technical problem, the utility model aims to provide a kind of electrostatic discharge protection circuit, in protection system inner wire
The damage of system will not be caused while road because of higher surge voltage and unusual condition occur.
The utility model solves the main technical schemes of above-mentioned technical problem：
A kind of electrostatic discharge protection circuit, it is characterised in that including the first clamp diode and the second clamp diode in parallel,
Also,
First clamp diode in parallel and the second clamp diode are connected to a protected circuit.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, first clamp diode and second clamp diode
It is monopole type transient voltage suppressor, and the anode of first clamp diode in parallel and the second clamp diode
Ground connection, negative electrode is connected to the protected circuit.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, first clamp diode in parallel and the pole of the second clamper two
The negative electrode of pipe is connected with a power end, and
The VCC ends of the protected circuit are also connected with the power end, and the electrostatic discharge protection circuit is used to protect power supply
On electrostatic event.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, also including an inductance element, it is connected on first clamper two
Between the negative electrode of pole pipe and second clamp diode.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, first clamp diode in parallel and the pole of the second clamper two
The negative electrode of pipe is connected with a signal input output end, and
The I/O ends of the protected circuit are also connected with the signal input output end, and the VCC of the protected circuit
End is connected with a power supply, the electrostatic event that the electrostatic discharge protection circuit is used on guard signal line.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, also including a resistive element, it is connected on first clamper two
Between the negative electrode of pole pipe and second clamp diode.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, the clamp voltage of first clamp diode is less than 50V.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, the clamp voltage of second clamp diode is less than 15V.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, first clamp diode and second clamp diode
It is ambipolar transient voltage suppressor.
Preferably, above-mentioned electrostatic discharge protection circuit, wherein, first clamp diode and second clamp diode
After parallel connection, one end is connected to the protected circuit, other end ground connection or earth-free.
Above-mentioned technical proposal has the advantage that or beneficial effect：
Two plate electrostatic discharge protection circuit disclosed in the utility model, by by two TVS（Transient Voltage
Suppressors, transient voltage suppressor）Parallel connection, by one-level TVS and the mutual security of two grades of TVS, can be ESD
Residual voltage control lower, and two-stage TVS has fast response time（Average response time< 25nS）, conduction impedance and lead
It is powered and presses little and leakage current low（Leakage current<1μA）The features such as.
Description of the drawings
With reference to appended accompanying drawing, to be described more fully embodiment of the present utility model.However, appended accompanying drawing is only used for
Bright and elaboration, does not constitute the restriction to the utility model scope.
Fig. 1 is the schematic diagram of electrostatic discharge protection circuit in the embodiment of the utility model one；
Fig. 2 is the schematic diagram of electrostatic discharge protection circuit in another embodiment of the utility model；
Fig. 3 is the fundamental diagram of electrostatic discharge protection circuit of the present utility model when there is esd event；
The monopole type TVS schematic diagrames that Fig. 4 is used by electrostatic discharge protection circuit of the present utility model；
The ambipolar TVS schematic diagrames that Fig. 5 is used by electrostatic discharge protection circuit of the present utility model.
Specific embodiment
In the following description, a large amount of concrete details are given the utility model is more thoroughly managed to provide
Solution.Except of course that these detailed descriptions are outer, the utility model can also have other embodiment.
Electrostatic discharge protection circuit of the present utility model, main the first clamp diode for including parallel connection and the pole of the second clamper two
Pipe, wherein, the first clamp diode of the parallel connection and the plus earth of the second clamp diode, negative electrode is connected to a protected electricity
Road, so that when there is esd event, the voltage clamp of the protected circuit will be flowed through in the range of normal working voltage.
Electrostatic discharge protection circuit of the present utility model is elaborated with reference to specific embodiment and accompanying drawing.
Embodiment one：
With reference to Fig. 1, the electrostatic discharge protection circuit of the present embodiment, including the first clamp diode in parallel and the pole of the second clamper two
Pipe, it is preferred that first clamp diode and the second clamp diode are transient voltage suppressor（Transient
Voltage Suppressors, abbreviation TVS）, TVS1 and TVS2 is denoted as in figure.Because TVS has fast response time（It is average to ring
Between seasonable< 25nS）, conduction impedance and conducting voltage is little and leakage current is low（Leakage current<1μA）The features such as, can be by ESD's
Residual voltage controls lower, plays more preferable electrostatic defending effect.
Further, the plus earth of TVS1 and TVS2 in parallel, negative electrode is connected to a protected circuit（Be denoted as in figure be
System IC）.System IC has an operating voltage VCC end, a ground connection GND end and multiple input and output I/O ends（For example in figure
Shown I/O1 ~ I/O4）.The electrostatic discharge protection circuit of the present embodiment is used to protect a power circuit, therefore the TVS1 and TVS2 of parallel connection
Negative electrode be connected to a power end（Vcc Port are denoted as in figure）, and power end Vcc Port are connected to system IC
VCC ends, and preferably, the GND ends of system IC are also grounded.
As a preferred embodiment, between TVS1 and the negative electrode of TVS2 in parallel, an inductance unit is also in series with
Part（L is denoted as in figure）, to play decoupling effect in electrostatic defending；Simultaneously because TVS has in itself a parasitic capacitance, TVS1 and
TVS2 and L-shaped are into pi type filter（Equivalent to two capacitors and an inductor）Circuit, it also has protection to make to system IC
With.
The operation principle of electrostatic discharge protection circuit that the present embodiment is formed is：
With continued reference to shown in Fig. 1 and Fig. 3 schematic diagrams, 5V is with the voltage at power Vcc Port end, is used
The V of TVS1 and TVS2RWMValue is 5V examples.When there is the esd event of 8kV, induced overvoltage is by Vcc Port（Institute in figure
Show A points）Come in circuit via line flows, TVS1 as system IC one-level protect, can tolerate 15kV air electrostatic and
The impact of the contact electrostatic of 10kV.After overvoltage is via TVS1, the residual voltage of ESD has already decreased to below 50V, and then TVS2 makees
Two grades for system IC are protected, and continue the voltage clamp that will open into system IC to below 15V, so as to ensure that system IC can be normal
Work.
Embodiment two：
The electrostatic discharge protection circuit of the present embodiment is basically identical with embodiment one, and its difference is, the present embodiment it is quiet
The esd event protection that electric protection circuit is used on holding wire.With reference to Fig. 2, TVS1 and the negative electrode of TVS2 in parallel is connected to one
Signal input output end（I/O1 Port are denoted as in figure）, and signal input output end I/O1 Port are connected to system IC
I/O1 ends, and the VCC ends of system IC are connected to a power Vcc.Between TVS1 and the negative electrode of TVS2, can be with the class of embodiment one
Like an inductance element of connecting, or one resistive element of series connection.Because the present embodiment is a signaling line circuit, therefore preferably exist
One resistive element of series connection between TVS1 and the negative electrode of TVS2（R is denoted as in figure）, to prevent inductance from producing shadow to high-frequency signal
Ring.
The operation principle of the electrostatic discharge protection circuit of the present embodiment is similar with embodiment one, therefore repeats no more.
In embodiment one and embodiment two, the TVS1 and TVS2 that are used are the diode of monopole type, such as Fig. 4 institutes
Show, after it is connected in parallel, negative electrode（Pin Pin1）It is connected to protected circuit, anode（Negative electrode Pin2）Need ground connection.But this reality
Monopole type diode is not limited to new TVS1 and TVS2, as shown in figure 5, in electrostatic discharge protection circuit of the present utility model
In, ambipolar diode can be equally used, pin Pin1 is connected to protected circuit after its parallel connection, and pin Pin2 can be grounded,
Also can be earth-free.Ambipolar TVS1 and TVS2 compared to monopole type TVS1 and TVS2, with bidirectional protective function.
In other embodiment of the present utility model, including the electrostatic discharge protection circuit of TVS1 in parallel and TVS2 can be used to appoint
Meaning needs the occasion for protecting electrostatic.In addition, if from protection thunderbolt/surge TVS, may also operate as protection be struck by lightning/
The effect of surge.
In sum, two plate electrostatic discharge protection circuit disclosed in the utility model, by by two TVS parallel connections, by
The mutual security of TVS and two grade of TVS of level, can control lower the residual voltage of ESD, and two-stage TVS has response speed
Hurry up（Average response time< 25nS）, conduction impedance and conducting voltage is little and leakage current is low（Leakage current<1μA）The features such as.
For a person skilled in the art, read after described above, various changes and modifications undoubtedly will be evident that.
Therefore, appending claims should regard the whole variations and modifications for covering true intention of the present utility model and scope as.
Any and all scope of equal value and content, are all considered as still belonging to intention of the present utility model and model in Claims scope
In enclosing.
Claims (10)
1. a kind of electrostatic discharge protection circuit, it is characterised in that including the first clamp diode and the second clamp diode in parallel, and
And,
First clamp diode in parallel and the second clamp diode are connected to a protected circuit.
2. electrostatic discharge protection circuit as claimed in claim 1, it is characterised in that first clamp diode and second pincers
Position diode is monopole type transient voltage suppressor, and first clamp diode in parallel and the pole of the second clamper two
The plus earth of pipe, negative electrode is connected to the protected circuit.
3. electrostatic discharge protection circuit as claimed in claim 2, it is characterised in that first clamp diode and second in parallel
The negative electrode of clamp diode is connected with a power end, and
The VCC ends of the protected circuit are also connected with the power end, and the electrostatic discharge protection circuit is used to protect on power supply
Electrostatic event.
4. electrostatic discharge protection circuit as claimed in claim 3, it is characterised in that also including an inductance element, be connected on described
Between the negative electrode of one clamp diode and second clamp diode.
5. electrostatic discharge protection circuit as claimed in claim 2, it is characterised in that first clamp diode and second in parallel
The negative electrode of clamp diode is connected with a signal input output end, and
The I/O ends of the protected circuit are also connected with the signal input output end, and the VCC ends of the protected circuit with
One power supply connects, the electrostatic event that the electrostatic discharge protection circuit is used on guard signal line.
6. electrostatic discharge protection circuit as claimed in claim 5, it is characterised in that also including a resistive element, be connected on described
Between the negative electrode of one clamp diode and second clamp diode.
7. electrostatic discharge protection circuit as claimed in claim 2, it is characterised in that the clamp voltage of first clamp diode is low
In 50V.
8. electrostatic discharge protection circuit as claimed in claim 7, it is characterised in that the clamp voltage of second clamp diode is low
In 15V.
9. electrostatic discharge protection circuit as claimed in claim 1, it is characterised in that first clamp diode and second pincers
Position diode is ambipolar transient voltage suppressor.
10. electrostatic discharge protection circuit as claimed in claim 9, it is characterised in that first clamp diode and described second
After clamp diode parallel connection, one end is connected to the protected circuit, other end ground connection or earth-free.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620777576.3U CN206164086U (en) | 2016-07-22 | 2016-07-22 | Electrostatic protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620777576.3U CN206164086U (en) | 2016-07-22 | 2016-07-22 | Electrostatic protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206164086U true CN206164086U (en) | 2017-05-10 |
Family
ID=58647429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620777576.3U Active CN206164086U (en) | 2016-07-22 | 2016-07-22 | Electrostatic protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206164086U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612575A (en) * | 2017-08-31 | 2018-01-19 | 广东欧珀移动通信有限公司 | Protection circuit, radio circuit and electronic equipment |
-
2016
- 2016-07-22 CN CN201620777576.3U patent/CN206164086U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612575A (en) * | 2017-08-31 | 2018-01-19 | 广东欧珀移动通信有限公司 | Protection circuit, radio circuit and electronic equipment |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Zuchongzhi road in Pudong New Area Zhangjiang hi tech park Shanghai 201203 Lane 2277 Building No. 7 Patentee after: Shanghai Xindao Electronic Technology Co., Ltd Address before: Zuchongzhi road in Pudong New Area Zhangjiang hi tech park Shanghai 201203 Lane 2277 Building No. 7 Patentee before: SHANGHAI PRISEMI ELECTRONIC TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |