CN204967250U - Be applied to ESD protection circuit in circuit - Google Patents
Be applied to ESD protection circuit in circuit Download PDFInfo
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- CN204967250U CN204967250U CN201520710426.6U CN201520710426U CN204967250U CN 204967250 U CN204967250 U CN 204967250U CN 201520710426 U CN201520710426 U CN 201520710426U CN 204967250 U CN204967250 U CN 204967250U
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Abstract
The utility model discloses a be applied to ESD protection circuit in circuit for carry out the electrostatic discharge protection to being controlled chip and main control chip, including pi type filter circuit, pi type filter circuit connects at the main control chip input/output terminal and is controlled between the public terminal of chip, and pi type filter circuit includes current -limiting resistor R1 to the rn that a plurality of is established ties in proper order, and n is for being greater than 1 natural number, and current -limiting resistor R1, last the connecting in parallel of current -limiting resistor rn have voltage -dividing capacitor, and voltage -dividing capacitor includes the common port ground connection of the first electric capacity and the second electric capacity of 2 mutual series connection, first electric capacity and second electric capacity at least. Through concatenating pi type filter circuit between control chip, when the loop was gone into to static or other interfering signal cluster, accessible pi type filter circuit carried out the filtering and absorbs through the RC mode, improves the interference killing feature of chip greatly, the guarantee product put into production with the use in difficult harm to ESD clearance frequency can be reduced and the cost of labor is reduced.
Description
Technical field
The utility model relates to ESD protector, specifically refers to a kind of ESD protection circuit be applied in circuit.
Background technology
Along with the development of electronic technology, the application of electronic equipment is more and more extensive, be not only high-tech sector as space flight and aviation equipment, also penetrated into the every aspect of people's life, as household electric appliances, communication equipment, Medical Devices etc., ESD does not exist everywhere, the normal work of ESD problem to equipment is a serious threat always, how protecting ESD, ensureing the normal work of equipment, is a long-standing problem engineer's difficult problem.ESD:Electro-Staticdischarge, i.e. static discharge.Electrostatic is very common in life, particularly produces at electronic product, transport, store and be easy in use procedure occur, when accumulation of static electricity (EOS) to a certain extent, can produce energy to a certain degree, this energy can cause irreversible damage to electronic equipment.
The damage caused to prevent static discharge, the method of current solution electrostatic interference has multiple, more common one increases the devices such as discharge tube on device, although this mode effectively can alleviate the electrostatic capacity that IC bears, adopts discharge tube cost intensive; Another kind is common mode is carry out electrostatic cleaning work to production and transport environment, but electronic product is in production, the accumulation of ESD can be produced at any time when storing and use, like this with regard to needs the multiple link of production and transport dispose available manpower carry out electrostatic cleaning protection, cause higher cost of labor and equipment cost.
Utility model content
The purpose of this utility model overcomes weak point of the prior art, provides a kind of ESD of minimizing to clear up frequency and reduce the ESD protection circuit be applied in circuit of cost of labor.
The purpose of this utility model is achieved through the following technical solutions:
A kind of ESD protection circuit be applied in circuit, for carrying out electrostatic discharge (ESD) protection to controlled chip and main control chip, it is characterized in that: comprise π type filter circuit, described π type filter circuit is connected between the public terminal of main control chip input and output terminal and controlled chip, described π type filter circuit comprises several current-limiting resistance R1 to Rn connected successively, described n be greater than 1 natural number, described current-limiting resistance R1, current-limiting resistance Rn is parallel with derided capacitors, described derided capacitors at least comprises 2 the first electric capacity and the second electric capacity of mutually connecting, the common end grounding of described first electric capacity and the second electric capacity.
Preferably, described n be more than or equal to 4 even number.
The utility model has the following advantages and beneficial effect compared to existing technology:
1, by being connected in series π type filter circuit between control chip, when electrostatic or other interference signals seal in loop, carry out filtering by π type filter circuit and absorbed by RC mode, can bear on the basis of certain ESD protection capability at main control chip, controlled chip self, the antijamming capability of chip greatly can be improved after adding this circuit again, improve the electrostatic defending grade of product, ensure that product not easily damages in manufacture and usage process, thus ESD cleaning frequency can be reduced and reduce cost of labor.
2, the utility model disturbs from filtering ESD propagation path, can solve electronic product ESD in different environments and protect adaptive capacity; And adopt cheap raw material, reduce the cost impact to product.
3, the utility model is except solving ESD protection question, can also filter because the interference signals such as electromagnetic radiation are to the interference of IC.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
As Fig. 1, a kind of ESD protection circuit be applied in circuit, for carrying out electrostatic discharge (ESD) protection to controlled chip and main control chip, it is characterized in that: comprise π type filter circuit, described π type filter circuit is connected between the public terminal of main control chip input and output terminal and controlled chip, described π type filter circuit comprises several current-limiting resistance R1 to Rn connected successively, described n be greater than 1 natural number, described current-limiting resistance R1, current-limiting resistance Rn is parallel with derided capacitors, described derided capacitors at least comprises 2 the first electric capacity and the second electric capacity of mutually connecting, the common end grounding of described first electric capacity and the second electric capacity.
In the present embodiment, described n be more than or equal to 4 even number, the resistance value of described current-limiting resistance R1 to R4 is all identical.As a kind of optimal way, described n equals 4, can guarantee that ESD signal is entered by the circuit in the middle of current-limiting resistance R2 and current-limiting resistance R3 like this, make resistive elements and capacitive device in circuit produce current limliting and dividing potential drop effect.
Due to main control chip to controlled chip signal transmission time, the erroneous judgement of controlled chip is easily caused after interference signal enters transmission circuit, cause the concussion of whole circuit, particularly after electrostatic signal enters transmission circuit, even may puncture controlled chip and main control chip.The utility model is connected in series the π type filter circuit of two groups of C-R-C – R between control chip, when electrostatic or other interference signals seal in loop, carry out filtering by π type filter circuit and absorbed by RC mode, can bear on the basis of certain ESD protection capability at main control chip, controlled chip self, the antijamming capability of chip greatly can be improved after adding this circuit again, improve the electrostatic defending grade of product, ensure that product not easily damages in manufacture and usage process, thus ESD cleaning frequency can be reduced and reduce cost of labor.Wherein, concrete against esd ability is mainly relevant with the effective resistance of resistive impedance, electric capacity and capacity.Electric capacity ESR is less, and its transient absorption ability is higher.The general electric capacity using low ESR low capacity herein.
Above-described embodiment is the utility model preferably execution mode; but execution mode of the present utility model is not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present utility model and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection range of the present utility model.
Claims (2)
1. one kind is applied to the ESD protection circuit in circuit, for carrying out electrostatic discharge (ESD) protection to controlled chip and main control chip, it is characterized in that: comprise π type filter circuit, described π type filter circuit is connected between the public terminal of main control chip input and output terminal and controlled chip, described π type filter circuit comprises several current-limiting resistance R1 to Rn connected successively, described n be greater than 1 natural number, described current-limiting resistance R1, current-limiting resistance Rn is parallel with derided capacitors, described derided capacitors at least comprises 2 the first electric capacity and the second electric capacity of mutually connecting, the common end grounding of described first electric capacity and the second electric capacity.
2. the ESD protection circuit be applied in circuit according to claim 1, is characterized in that: described n be more than or equal to 4 even number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520710426.6U CN204967250U (en) | 2015-09-14 | 2015-09-14 | Be applied to ESD protection circuit in circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520710426.6U CN204967250U (en) | 2015-09-14 | 2015-09-14 | Be applied to ESD protection circuit in circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204967250U true CN204967250U (en) | 2016-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520710426.6U Active CN204967250U (en) | 2015-09-14 | 2015-09-14 | Be applied to ESD protection circuit in circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204967250U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109120237A (en) * | 2018-08-02 | 2019-01-01 | 欣旺达电动汽车电池有限公司 | A kind of analog signal detection port-guard circuit |
| CN109473963A (en) * | 2018-12-28 | 2019-03-15 | 江苏邦融微电子有限公司 | A kind of electrostatic protection structure |
| CN109633952A (en) * | 2019-01-21 | 2019-04-16 | 长沙硕博电子科技股份有限公司 | A kind of industrial touch screen electrostatic protection apparatus |
| CN112822828A (en) * | 2020-12-31 | 2021-05-18 | 成都旭光科技股份有限公司 | Circuit for improving electrostatic protection capability of WiFi module |
| CN112930014A (en) * | 2021-01-28 | 2021-06-08 | 青岛信芯微电子科技股份有限公司 | Electrostatic discharge protection circuit and protection method |
-
2015
- 2015-09-14 CN CN201520710426.6U patent/CN204967250U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109120237A (en) * | 2018-08-02 | 2019-01-01 | 欣旺达电动汽车电池有限公司 | A kind of analog signal detection port-guard circuit |
| CN109120237B (en) * | 2018-08-02 | 2023-03-10 | 欣旺达电动汽车电池有限公司 | Protection circuit for analog signal detection port |
| CN109473963A (en) * | 2018-12-28 | 2019-03-15 | 江苏邦融微电子有限公司 | A kind of electrostatic protection structure |
| CN109633952A (en) * | 2019-01-21 | 2019-04-16 | 长沙硕博电子科技股份有限公司 | A kind of industrial touch screen electrostatic protection apparatus |
| CN112822828A (en) * | 2020-12-31 | 2021-05-18 | 成都旭光科技股份有限公司 | Circuit for improving electrostatic protection capability of WiFi module |
| CN112822828B (en) * | 2020-12-31 | 2024-03-15 | 成都旭光科技股份有限公司 | Circuit for improving electrostatic protection capability of WiFi module |
| CN112930014A (en) * | 2021-01-28 | 2021-06-08 | 青岛信芯微电子科技股份有限公司 | Electrostatic discharge protection circuit and protection method |
| CN112930014B (en) * | 2021-01-28 | 2022-04-01 | 青岛信芯微电子科技股份有限公司 | Electrostatic discharge protection circuit and protection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |