CN204243745U - A kind of piezo-resistance anti-surge protection circuit - Google Patents
A kind of piezo-resistance anti-surge protection circuit Download PDFInfo
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- CN204243745U CN204243745U CN201420718522.0U CN201420718522U CN204243745U CN 204243745 U CN204243745 U CN 204243745U CN 201420718522 U CN201420718522 U CN 201420718522U CN 204243745 U CN204243745 U CN 204243745U
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- piezo
- resistance
- surge
- circuit
- input interface
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Abstract
The utility model discloses a kind of piezo-resistance anti-surge protection circuit, comprise input interface, the power end of described input interface and ground end are connected with the parallel circuits of piezo-resistance and protection diode; The power end of described input interface and piezo-resistance and protect between diode and be serially connected with anti-surge circuit.Piezo-resistance anti-surge protection circuit of the present utility model is the piezo-resistance set temperature upper limit by temperature switch; Once reach the upper limit, piezo-resistance can not continue to bear pressure release effect, thus avoids burning; Can ensure can not be burnt circuit because lightning protection circuit is struck by lightning.
Description
Technical field
The utility model relates to a kind of piezo-resistance anti-surge protection circuit, belongs to lightning protection circuit technical field.
Background technology
In prior art, a lot of circuit board has all been integrated with lightning protection function, and lightning protection circuit is directly installed on circuit board by it, and its simplest lightning protection circuit is directly made up of pressure cell; When being subject to lightning surge, the power of piezo-resistance sharply increases, and when meeting or exceeding the limit, piezo-resistance temperature will raise, if not open circuit, then piezo-resistance will be burnt, easy initiation fire, causes whole circuit board to be damaged.
Summary of the invention
(1) technical problem that will solve
For solving the problem, the utility model proposes a kind of piezo-resistance anti-surge protection circuit; Can ensure can not be burnt circuit because lightning protection circuit is struck by lightning.
(2) technical scheme
Piezo-resistance anti-surge protection circuit of the present utility model, comprises input interface, and the power end of described input interface and ground end are connected with the parallel circuits of piezo-resistance and protection diode; The power end of described input interface and piezo-resistance and protect between diode and be serially connected with anti-surge circuit.
Further, described anti-surge circuit is made up of temperature switch and resistance to piezoresistance; Described temperature switch is fixed in piezo-resistance by heat conductive silica gel bonding; Described anti-surge circuit is serially connected with between the power end of input interface and the parallel circuits of piezo-resistance and protection diode.
Further, described anti-surge circuit is made up of votage control switch; Described votage control switch is serially connected with between the power end of input interface and the parallel circuits of piezo-resistance and protection diode.
Again further, described resistance to piezoresistance can be high-power resistor or piezo-resistance.
(3) beneficial effect
Compared with prior art, piezo-resistance anti-surge protection circuit of the present utility model is the piezo-resistance set temperature upper limit by temperature switch; Or by the resistance to setting voltage upper limit that compresses switch, once reach the upper limit, piezo-resistance can not continue to bear pressure release effect, thus avoids burning; Can ensure can not be burnt circuit because lightning protection circuit is struck by lightning.
Accompanying drawing explanation
Fig. 1 is embodiment 1 circuit theory diagrams of the present utility model;
Fig. 2 is embodiment 2 circuit theory diagrams of the present utility model.
Embodiment
Embodiment 1:
Piezo-resistance anti-surge protection circuit as shown in Figure 1 comprises input interface, and the power end VCC of described input interface P12 and ground end GND is connected with the parallel circuits of piezo-resistance R1 and protection diode D1; The power end VCC of described input interface and piezo-resistance R1 and protect between diode D1 be serially connected with anti-surge circuit ' described anti-surge circuit is made up of temperature switch K1 and the R2 of resistance to piezoresistance; Described temperature switch K1 is fixed on piezo-resistance R1 by heat conductive silica gel bonding; Described anti-surge circuit is serially connected with between the power end VCC of input interface and the parallel circuits of piezo-resistance R1 and protection diode D1.
Wherein, described resistance to piezoresistance can be high-power resistor or piezo-resistance.
Embodiment 2:
The present embodiment main body circuit is consistent with embodiment 1, and wherein, described anti-surge circuit is made up of votage control switch; Described votage control switch is serially connected with between the power end of input interface and the parallel circuits of piezo-resistance and protection diode.
Embodiment recited above is only be described preferred implementation of the present utility model, not limits design of the present utility model and scope.Under the prerequisite not departing from the utility model design concept; the various modification that this area ordinary person makes the technical solution of the utility model and improvement; protection range of the present utility model all should be dropped into; the technology contents of the utility model request protection, all records in detail in the claims.
Claims (4)
1. a piezo-resistance anti-surge protection circuit, comprises input interface, and the power end of described input interface and ground end are connected with the parallel circuits of piezo-resistance and protection diode; It is characterized in that: the power end of described input interface and piezo-resistance and protect between diode and be serially connected with anti-surge circuit.
2. piezo-resistance anti-surge protection circuit according to claim 1, is characterized in that: described anti-surge circuit is made up of temperature switch and resistance to piezoresistance; Described temperature switch is fixed in piezo-resistance by heat conductive silica gel bonding; Described anti-surge circuit is serially connected with between the power end of input interface and the parallel circuits of piezo-resistance and protection diode.
3. piezo-resistance anti-surge protection circuit according to claim 1, is characterized in that: described anti-surge circuit is made up of votage control switch; Described votage control switch is serially connected with between the power end of input interface and the parallel circuits of piezo-resistance and protection diode.
4. piezo-resistance anti-surge protection circuit according to claim 2, is characterized in that: described resistance to piezoresistance can be high-power resistor or piezo-resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420718522.0U CN204243745U (en) | 2014-11-26 | 2014-11-26 | A kind of piezo-resistance anti-surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420718522.0U CN204243745U (en) | 2014-11-26 | 2014-11-26 | A kind of piezo-resistance anti-surge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204243745U true CN204243745U (en) | 2015-04-01 |
Family
ID=52773191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420718522.0U Expired - Fee Related CN204243745U (en) | 2014-11-26 | 2014-11-26 | A kind of piezo-resistance anti-surge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204243745U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866461A (en) * | 2016-05-20 | 2016-08-17 | 宁波佳明测控技术有限公司 | Speed test device for integrated sensor of CRH (China railway high-speed) 5 |
-
2014
- 2014-11-26 CN CN201420718522.0U patent/CN204243745U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866461A (en) * | 2016-05-20 | 2016-08-17 | 宁波佳明测控技术有限公司 | Speed test device for integrated sensor of CRH (China railway high-speed) 5 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 300384 room 2018, block D, No. 6 Zi Yuan Road, Huayuan Industrial Zone, Nankai District, Tianjin. Patentee after: Tianjin created cloud technology Limited by Share Ltd Address before: 300384 room 2018, block D, No. 6 Zi Yuan Road, Huayuan Industrial Zone, Nankai District, Tianjin. Patentee before: Video signal Science and Technology Ltd. of Tianjin Tontru |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150401 Termination date: 20171126 |