CN202034777U - ESD (electrostatic discharge) protective circuit used for capacitive load - Google Patents
ESD (electrostatic discharge) protective circuit used for capacitive load Download PDFInfo
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- CN202034777U CN202034777U CN2011201511951U CN201120151195U CN202034777U CN 202034777 U CN202034777 U CN 202034777U CN 2011201511951 U CN2011201511951 U CN 2011201511951U CN 201120151195 U CN201120151195 U CN 201120151195U CN 202034777 U CN202034777 U CN 202034777U
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- voltage suppressor
- transient voltage
- capacitive load
- resistor
- esd
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Abstract
The utility model discloses an ESD (electrostatic discharge) protective circuit used for a capacitive load, which comprises a transient voltage suppressor and a resistor. The transient voltage suppressor is connected with the resistor in parallel, the transient voltage suppressor and the resistor are connected with the capacitive load in parallel, the capacitive load can be devices such as an MEMS (micro-electromechanical system), a VOA (variable optical attenuator) and the like, and the transient voltage suppressor can be a voltage stabilizing diode, or a zener diode, or a TVS (transient voltage suppressor) diode or a voltage dependent resistor. When electrostatic discharge occurs, most of static electricity can be released by the aid of a switch function of the transient voltage suppressor. Simultaneously, by means of the resistor, residual static electricity can be released thoroughly, so that the load devices are fully protected and reliability of operation of a system is enhanced. Besides, the ESD protective circuit used for the capacitive load is simple in structure and low in cost.
Description
Technical field
The utility model relates to a kind of ESD protection circuit that is used for capacity load, for example, is used for the ESD protection of capacity loads such as MEMSVOA.
Background technology
Static discharge ESD is the abbreviation of English electrostatic discharge, it is the quiescent current of being released by non-conduction surfaces moment, static discharge can cause the damage and the performance decrease of electronic devices and components in the circuit, it produces root is many-sided, a lot of indescribable damages of product are just relevant with static discharge, therefore, the protection of static discharge more and more is subjected to the attention of each enterprise.Especially work as electronic device itself and have charge storage ability, when promptly having the characteristic of electric capacity, the MEMS VOA in the optical communication field for example, devices such as MEMS TF, it is insufficient that then Chang Gui ESD protection circuit can have discharge, problems such as cost increase that the circuit structure complexity caused or the increase of composing difficulty.
Summary of the invention
In order to solve problems of the prior art, the utility model provides a kind of ESD protection circuit that is used for capacity load.
The technical solution of the utility model is specially: the ESD protection circuit that is used for capacity load comprises a transient state voltage suppressor and one and described Transient Voltage Suppressor parallel resistor, and described Transient Voltage Suppressor and described resistance and described capacity load are connected in parallel.
Wherein, described capacity load can be MEMS VOA, MEMS TF etc., and described Transient Voltage Suppressor can adopt a voltage stabilizing didoe or a Zener diode or a TVS diode to realize, also can adopt a piezo-resistance to realize.
Compared with prior art, advantage of the present utility model and good effect are: when static discharge, transient high voltage, big electric current is drawn away by described transient voltage suppresser discharges, remaining electrostatic potential, electric current are then by thoroughly being discharged with described transient voltage suppresser parallel resistor, finally, make load device avoid electrostatic influence.Therefore, the sufficient advantage of the concrete discharge of ESD circuit provided by the utility model, and also circuit structure of the present utility model is simple, and cost is also low.
Description of drawings
Fig. 1 is the circuit theory diagrams of ESD protection circuit described in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done further detailed description.
As shown in Figure 1, what transient voltage suppresser adopted is voltage stabilizing didoe, voltage stabilizing didoe D1 and resistance R 1 are connected in parallel with load device VOA, wherein, the negative pole of voltage stabilizing didoe D1 links to each other with the anodal VOA+ of load device VOA, its positive pole links to each other with the negative pole VOA-of load device VOA, and, lead to two electrode A and B from voltage stabilizing didoe D1 two ends.
When the electrode A point had instantaneous pressure to pour in, voltage stabilizing didoe D5 was suppressed at A, B two point voltages near the reverse breakdown voltage of voltage stabilizing didoe D1, simultaneously, guides one part of current into the electrode B point by resistance R 1.
And when the electrode B point had instantaneous pressure to pour in, voltage stabilizing didoe D1 then was in the forward conduction state, and it guides most of electric charge into the electrode A point from the electrode B point, simultaneously, guided one part of current into the electrode A point by resistance R 1.
When the instantaneous pressure discharge finishes, the electrical potential difference of the remnants at load device VOA two ends will discharge gradually by R1, make load device VOA two-plate finally reach balance.Thereby, make load device VOA two-plate avoid the result who damages because of voltage difference is too high.
Because Zener diode is the same with voltage stabilizing didoe with the TVS diode; all has the characteristic that under the high back voltage state, produces the Zener snowslide; piezo-resistance also has the voltage-current characteristic of voltage-stabiliser tube; therefore; when voltage stabilizing didoe changes by Zener diode or TVS diode or piezo-resistance; also can play identical protective effect to load device, its course of work and above-mentioned voltage stabilizing didoe are approximate.
The above is the utility model most preferred embodiment only, is not to be used to limit scope of the present utility model, and all equivalences of being done according to the utility model claim change or modify, and are all the utility model and contain.
Claims (4)
1. be used for the ESD protection circuit of capacity load, it is characterized in that, comprise a transient state voltage suppressor and one and described Transient Voltage Suppressor parallel resistor, described Transient Voltage Suppressor, described resistance and described capacity load are connected in parallel.
2. ESD protection circuit as claimed in claim 1 is characterized in that, described capacity load is MEMS VOA.
3. ESD protection circuit as claimed in claim 1 is characterized in that, described Transient Voltage Suppressor is a voltage stabilizing didoe or a Zener diode or a TVS diode.
4. ESD protection circuit as claimed in claim 1 is characterized in that, described Transient Voltage Suppressor is a piezo-resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201511951U CN202034777U (en) | 2011-05-12 | 2011-05-12 | ESD (electrostatic discharge) protective circuit used for capacitive load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201511951U CN202034777U (en) | 2011-05-12 | 2011-05-12 | ESD (electrostatic discharge) protective circuit used for capacitive load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202034777U true CN202034777U (en) | 2011-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201511951U Expired - Fee Related CN202034777U (en) | 2011-05-12 | 2011-05-12 | ESD (electrostatic discharge) protective circuit used for capacitive load |
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| CN (1) | CN202034777U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8767370B2 (en) | 2012-07-25 | 2014-07-01 | International Business Machines Corporation | Providing noise protection in a signal transmission system |
| CN104849578A (en) * | 2015-02-27 | 2015-08-19 | 南京师范大学 | Test analysis method for evaluating TVS load effect characteristic of LNA source terminal |
| CN105048428A (en) * | 2015-06-29 | 2015-11-11 | 国电南京自动化股份有限公司 | Protective circuit for analog input ports |
| CN105429124A (en) * | 2015-12-31 | 2016-03-23 | 峰岹科技（深圳）有限公司 | Input overvoltage protection circuit used for high-voltage integrated circuit |
| CN107546731A (en) * | 2017-09-20 | 2018-01-05 | 奕瑞影像科技（太仓）有限公司 | A kind of plug-and-play circuit, interface circuit and electronic equipment |
| WO2019000666A1 (en) * | 2017-06-27 | 2019-01-03 | 联想(北京)有限公司 | Transient voltage suppressor, signal transmission circuit and electronic device |
| CN110967852A (en) * | 2019-11-20 | 2020-04-07 | Tcl华星光电技术有限公司 | Liquid crystal display device having a plurality of pixel electrodes |
| CN113442775A (en) * | 2021-07-23 | 2021-09-28 | 长春捷翼汽车零部件有限公司 | Charging and discharging control method, charging device and storage medium |
-
2011
- 2011-05-12 CN CN2011201511951U patent/CN202034777U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8767370B2 (en) | 2012-07-25 | 2014-07-01 | International Business Machines Corporation | Providing noise protection in a signal transmission system |
| CN104849578A (en) * | 2015-02-27 | 2015-08-19 | 南京师范大学 | Test analysis method for evaluating TVS load effect characteristic of LNA source terminal |
| CN104849578B (en) * | 2015-02-27 | 2017-07-28 | 南京师范大学 | A kind of method for testing and analyzing of the TVS load effect characteristics of assessment LNA sources |
| CN105048428A (en) * | 2015-06-29 | 2015-11-11 | 国电南京自动化股份有限公司 | Protective circuit for analog input ports |
| CN105429124A (en) * | 2015-12-31 | 2016-03-23 | 峰岹科技（深圳）有限公司 | Input overvoltage protection circuit used for high-voltage integrated circuit |
| WO2019000666A1 (en) * | 2017-06-27 | 2019-01-03 | 联想(北京)有限公司 | Transient voltage suppressor, signal transmission circuit and electronic device |
| CN107546731A (en) * | 2017-09-20 | 2018-01-05 | 奕瑞影像科技（太仓）有限公司 | A kind of plug-and-play circuit, interface circuit and electronic equipment |
| CN110967852A (en) * | 2019-11-20 | 2020-04-07 | Tcl华星光电技术有限公司 | Liquid crystal display device having a plurality of pixel electrodes |
| CN110967852B (en) * | 2019-11-20 | 2021-04-27 | Tcl华星光电技术有限公司 | Liquid crystal display device having a plurality of pixel electrodes |
| CN113442775A (en) * | 2021-07-23 | 2021-09-28 | 长春捷翼汽车零部件有限公司 | Charging and discharging control method, charging device and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111109 Termination date: 20190512 |
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| CF01 | Termination of patent right due to non-payment of annual fee |