CN102709873A - Overvoltage protection device of electronic circuit - Google Patents
Overvoltage protection device of electronic circuit Download PDFInfo
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- CN102709873A CN102709873A CN2012101917004A CN201210191700A CN102709873A CN 102709873 A CN102709873 A CN 102709873A CN 2012101917004 A CN2012101917004 A CN 2012101917004A CN 201210191700 A CN201210191700 A CN 201210191700A CN 102709873 A CN102709873 A CN 102709873A
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- electronic circuit
- overvoltage protection
- triode
- protection device
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Abstract
The invention discloses an overvoltage protection device of an electronic circuit. The overvoltage protection device of the electronic circuit is characterized by comprising a resistor, a diode, a triode, a first pin, a second pin and a third pin, wherein the first pine, the resistor and the diode are connected in series and then are connected with the base electrode of the triode; the emitting electrode of the triode is connected with the third pin; the third pin is grounded; the collecting electrode of the triode or a composite tube is connected with the second pin; the second pin is connected with the power end of the electronic circuit; and the first pin is connected with the direct power end of a protected device in the electronic circuit. The overvoltage protection device protects the protected device which has high cost and is difficult to maintain through breakdown of the overvoltage protection device, so the overvoltage protection device has no crosstalk on the electronic circuit and has a good protective effect. The overvoltage protection device has low cost, is easy to maintain and has wide popularization and application prospect.
Description
Technical field
The present invention relates to a kind of circuit protection technical field, mainly be applicable to the overvoltage protection of electronic circuit.
Background technology
In electronic circuit, the for example production of printed circuit board or other circuit and use, the time regular meeting cause some device damage because of the overvoltage that occurs in the circuit, even cause whole printed circuit board to scrap.At present, though there is the technical scheme of numerous overvoltage protections, main application form is that overvoltage protection is serially connected in the circuit, stable power-supplying voltage.But there are some defectives in existing overvoltage protection, and for example, to crosstalking of main circuit, perhaps cost is high.
Summary of the invention
Technical problem to be solved by this invention provides a kind of electronic circuit overvoltage protection, and it is effective that it has overvoltage protection, characteristics with low cost.
For solving the problems of the technologies described above, the invention provides a kind of electronic circuit overvoltage protection, it is characterized in that; Comprise resistance, diode, triode pipe, first pin, second pin and the 3rd pin; Said first pin, resistance and after diode is connected; The base stage that connects said triode, the emitter of said triode connect said the 3rd pin, said the 3rd pin ground connection; The collector electrode of said triode or multiple tube connects said second pin, and said second pin connects the power end of said electronic circuit; Said first pin connects the direct power end of protected device in the said electronic circuit.
Preferably, said first pin, second pin, the 3rd pin and protected device circuit are through mounting or being connected of plug-in mounting.
Principle of the present invention is: overvoltage protection is connected with the employing power supply parallel way of protected device.When the terminal voltage of protected device in the electronic circuit surpasses the rated voltage certain value for a certain reason; The small increase of the terminal voltage of protected device causes that the electric current of triode sharply increases; Thereby make triode breakdown; The power supply of electronic circuit directly with the ground conducting, be equivalent to cut off the power supply of protected device, thereby the protected device in the protective circuit itself is not destroyed by overvoltage.
Overvoltage protection of the present invention through self breakdown protected cost high, safeguard the more protected device of difficulty, therefore, it does not exist the crosstalking of electronic circuit, and protects effectively; Simultaneously, self cost of overvoltage protection is very cheap, is easy to safeguard that the prospect of applying is arranged.
Description of drawings
Fig. 1 is the functional circuit schematic diagram of the embodiment of the invention.
Vcc end among the figure is power end; Anti-triangle symbol is an earth terminal; R1 is a resistance, and about 50 Ω, Vx are several diode in series, and V1 is triode or multiple tube.
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention; Below in conjunction with accompanying drawing and preferred embodiment, the embodiment and the operation principle of the short-circuit type circuit overvoltage protection that proposes according to the present invention is elaborated.
As shown in Figure 1, connect the base stage of triode or multiple tube V1 after first pin, resistance and the diode series connection, the emitter of triode or multiple tube V1 connects the 3rd pin, the 3rd pin ground connection.The collector electrode of triode or multiple tube V1 connects second pin, and second pin connects the power Vcc of electronic circuit; The direct power end Ui of protected device in the first pin connecting circuit, the magnitude of voltage of Ui end is the threshold voltage of protected device.
When the terminal voltage of protected device in the electronic circuit surpasses the rated voltage certain value for a certain reason; Withstand voltage situation according to device in the circuit is set; Be generally exceed rated voltage 10%～30% for the threshold voltage of protected device; The small increase of the voltage of Ui end causes that the electric current of triode or multiple tube V1 sharply increases, thereby makes triode or multiple tube V1 breakdown, power Vcc directly with the ground conducting; Be equivalent to cut off the mistake voltage source of protected device, thereby the protected device in the protective circuit is unaffected.In the present embodiment, V1 triode (or multiple tube) can be not less than 1 second through the moment of the above electric current of 3A.
This overvoltage protection device can be drawn many pins from series diode according to threshold voltage is required, by the difference of user according to the operating voltage of its applied circuit, from different threshold voltage contact places in circuit; When making the overvoltage protection device of multi-door sill voltage, Ui end is high threshold voltage end.
It should be noted last that; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although with reference to instance the present invention is specified, those of ordinary skill in the art should be appreciated that and can make amendment or be equal to replacement technical scheme of the present invention; And not breaking away from the spirit and the scope of technical scheme of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (2)
1. an electronic circuit overvoltage protection is characterized in that, comprises resistance; Diode, triode pipe, first pin, second pin and the 3rd pin, said first pin, resistance and after diode is connected; The base stage that connects said triode, the emitter of said triode connect said the 3rd pin, said the 3rd pin ground connection; The collector electrode of said triode or multiple tube connects said second pin, and said second pin connects the power end of said electronic circuit; Said first pin connects the direct power end of protected device in the said electronic circuit.
2. electronic circuit overvoltage protection according to claim 1 is characterized in that, said first pin, second pin, the 3rd pin and protected device circuit are through mounting or being connected of plug-in mounting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210191700.4A CN102709873B (en) | 2012-06-12 | 2012-06-12 | Overvoltage protection device of electronic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210191700.4A CN102709873B (en) | 2012-06-12 | 2012-06-12 | Overvoltage protection device of electronic circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102709873A true CN102709873A (en) | 2012-10-03 |
| CN102709873B CN102709873B (en) | 2015-07-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210191700.4A Active CN102709873B (en) | 2012-06-12 | 2012-06-12 | Overvoltage protection device of electronic circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102709873B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070070564A1 (en) * | 2005-09-19 | 2007-03-29 | Yintat Ma | Esd protection circuits for rf input pins |
| CN200950534Y (en) * | 2006-09-29 | 2007-09-19 | 深圳创维－Rgb电子有限公司 | AC overvoltage protection circuitry |
| CN200976485Y (en) * | 2006-11-30 | 2007-11-14 | 青岛海信电器股份有限公司 | Under-voltage protection circuitry |
| CN202712815U (en) * | 2012-06-12 | 2013-01-30 | 湖北三江航天红峰控制有限公司 | Electronic circuit over-voltage protector |
-
2012
- 2012-06-12 CN CN201210191700.4A patent/CN102709873B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070070564A1 (en) * | 2005-09-19 | 2007-03-29 | Yintat Ma | Esd protection circuits for rf input pins |
| CN200950534Y (en) * | 2006-09-29 | 2007-09-19 | 深圳创维－Rgb电子有限公司 | AC overvoltage protection circuitry |
| CN200976485Y (en) * | 2006-11-30 | 2007-11-14 | 青岛海信电器股份有限公司 | Under-voltage protection circuitry |
| CN202712815U (en) * | 2012-06-12 | 2013-01-30 | 湖北三江航天红峰控制有限公司 | Electronic circuit over-voltage protector |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102709873B (en) | 2015-07-01 |
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