CN203233173U - Lightning protection circuit - Google Patents
Lightning protection circuit Download PDFInfo
- Publication number
- CN203233173U CN203233173U CN 201320261672 CN201320261672U CN203233173U CN 203233173 U CN203233173 U CN 203233173U CN 201320261672 CN201320261672 CN 201320261672 CN 201320261672 U CN201320261672 U CN 201320261672U CN 203233173 U CN203233173 U CN 203233173U
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- resistance
- type triode
- positive
- triode
- lightning
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Abstract
The utility model discloses a lightning protection circuit which comprises a PNP-type triode T1, a NPN-type triode T2, a resistor R1, a resistor R2, and a zener diode D1. The base electrode of the PNP-type triode T1 is connected with the emitter electrode of the PNP-type triode T1, and the base electrode and the emitter electrode of the PNP-type triode T1 are connected to a VDD. The collector electrode of the PNP-type triode T1 is connected with one terminal of the resistor R2, and the other terminal of the resistor R2 is connected with the resistor R1. The other terminal of the resistor R1 is connected to the collector electrode of the NPN-type triode T2. The emitter electrode and the base electrode of the NPN-type triode T2 are connected with each other and also grounded. The emitter electrode of the NPN-type triode T2 is connected with the positive electrode of the zener diode D1, and the negative electrode of the zener diode D1 is connected to the VDD. The lightning protection circuit has a simple structure of the circuit. The lightning protection circuit is connected between a power supply and the internal circuit of an electronic product, which enables lightning to be discharged at the interface of the power supply and effectively protects the internal circuit of the electronic product.
Description
Technical field
The utility model relates to a kind of circuit structure, relates to a kind of lightning protected circuit in particular.
Background technology
Along with the popularity rate of electronic product, household appliances is more and more higher, use more and more wider, its become we the life in an indispensable part.Because present electronic product and the function of electrical home appliances are more and more, the density of the circuit design that it is inner is also increasing, and the quantity of electronic devices and components also increases thereupon.Especially in summer, how these household appliances and electronic product being realized lightning protection, is a very stubborn problem.
The utility model content
The utility model provides a kind of lightning protected circuit, and its circuit structure is simple, and it is connected between the internal circuit of power supply and electronic product, and thunder and lightning is namely released in power supply excuse place, effectively protects the internal circuit of electronic product.
For solving above-mentioned technical problem, the utility model by the following technical solutions:
Lightning protected circuit; it comprises positive-negative-positive triode T1; NPN type triode T2; resistance R 1; resistance R 2 and voltage stabilizing didoe D1; the base stage of described positive-negative-positive triode T1 links to each other with emitter and is connected on the VDD simultaneously; the collector electrode of described positive-negative-positive triode T1 is connected an end of resistance R 2; the other end of described resistance R 2 links to each other with resistance R 1; the other end of described resistance R 1 is connected on the collector electrode of NPN type triode T2; the emitter of described NPN type triode T2 links to each other with base stage and while ground connection; the emitter of described NPN type triode T2 links to each other with the positive pole of voltage stabilizing didoe D1, and the negative pole of described voltage stabilizing didoe D1 is connected on the VDD.
The utility model adopts two triodes, two resistance and voltage stabilizing didoe to realize that its circuit structure is simple, also is convenient to be integrated on the internal circuit of electronic product to the releasing of thunder and lightning.Thunder and lightning is when entering lightning protected circuit between resistance R 1 and the resistance R 2, and this lightning protected circuit provides many paths of releasing.When testing, VDD ground connection, the IO port adds positive lightning voltage, and electric current directly flows away from positive-negative-positive triode T1.If VDD ground connection, the IO port adds negative lightning voltage, and then electric current flows through NPN type triode T2 successively, voltage stabilizing didoe and positive-negative-positive triode T1.If when ground wire grounded, the IO port adds positive lightning voltage, and electric current flows through positive-negative-positive triode T1 successively, voltage stabilizing didoe, NPN type triode T2.If the IO port adds negative lightning voltage, then electric current flows away by NPN type triode T2.Positive-negative-positive triode T1, NPN type triode T2 are current controling element, and it is with low cost, and stable performance is fit to extensive the use.
Further technical scheme is:
Also comprise resistance R 3, an end of described resistance R 3 is connected between resistance R 1 and the resistance R 2.
The two ends of resistance R 3 are connected on the power interface and internal circuit of electronic product, and an end of connection internal circuit is connected between resistance R 1 and the resistance R 2 simultaneously.In order further to protect the internal circuit of electronic product, between power interface and internal circuit, connect a resistance R 3, the effect of resistance R 3 its current limlitings.
The Standard resistance range of described resistance R 3 is 5000 ohm to 10000 ohm.
Resistance R 3 plays current limliting, and then resistance R 3 should be big as much as possible.
The resistance of described resistance R 1 and resistance R 2 equates.
The resistance of described resistance R 3 is greater than the resistance of resistance R 1.
Compared with prior art, the beneficial effects of the utility model are:
1, circuit structure of the present utility model is simple, is convenient to be integrated on the internal circuit of electronic product.
2, lightning protected circuit of the present utility model provides many thunder and lightning leadage circuits that thunder and lightning is released, and has good lightning protection effect.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.Execution mode of the present utility model includes but not limited to the following example.
[embodiment]
Lightning protected circuit as shown in Figure 1; it comprises positive-negative-positive triode T1; NPN type triode T2; resistance R 1; resistance R 2 and voltage stabilizing didoe D1; the base stage of described positive-negative-positive triode T1 links to each other with emitter and is connected on the VDD simultaneously; the collector electrode of described positive-negative-positive triode T1 is connected an end of resistance R 2; the other end of described resistance R 2 links to each other with resistance R 1; the other end of described resistance R 1 is connected on the collector electrode of NPN type triode T2; the emitter of described NPN type triode T2 links to each other with base stage and while ground connection; the emitter of described NPN type triode T2 links to each other with the positive pole of voltage stabilizing didoe D1, and the negative pole of described voltage stabilizing didoe D1 is connected on the VDD.
Also comprise resistance R 3, an end of described resistance R 3 is connected between resistance R 1 and the resistance R 2.
The Standard resistance range of described resistance R 3 is 5000 ohm to 10000 ohm.
The resistance of described resistance R 1 and resistance R 2 equates.
The resistance of described resistance R 3 is greater than the resistance of resistance R 1.
Be embodiment of the present utility model as mentioned above.The utility model is not limited to above-mentioned execution mode, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection range of the present utility model.
Claims (5)
1. lightning protected circuit; it is characterized in that: it comprises positive-negative-positive triode T1; NPN type triode T2; resistance R 1; resistance R 2 and voltage stabilizing didoe D1; the base stage of described positive-negative-positive triode T1 links to each other with emitter and is connected on the VDD simultaneously; the collector electrode of described positive-negative-positive triode T1 is connected an end of resistance R 2; the other end of described resistance R 2 links to each other with resistance R 1; the other end of described resistance R 1 is connected on the collector electrode of NPN type triode T2; the emitter of described NPN type triode T2 links to each other with base stage and while ground connection; the emitter of described NPN type triode T2 links to each other with the positive pole of voltage stabilizing didoe D1, and the negative pole of described voltage stabilizing didoe D1 is connected on the VDD.
2. lightning protected circuit according to claim 1, it is characterized in that: also comprise resistance R 3, an end of described resistance R 3 is connected between resistance R 1 and the resistance R 2.
3. lightning protected circuit according to claim 2, it is characterized in that: the Standard resistance range of described resistance R 3 is 5000 ohm to 10000 ohm.
4. lightning protected circuit according to claim 2 is characterized in that: the resistance of described resistance R 1 and resistance R 2 equates.
5. lightning protected circuit according to claim 2, it is characterized in that: the resistance of described resistance R 3 is greater than the resistance of resistance R 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320261672 CN203233173U (en) | 2013-05-15 | 2013-05-15 | Lightning protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320261672 CN203233173U (en) | 2013-05-15 | 2013-05-15 | Lightning protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203233173U true CN203233173U (en) | 2013-10-09 |
Family
ID=49289277
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320261672 Expired - Fee Related CN203233173U (en) | 2013-05-15 | 2013-05-15 | Lightning protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203233173U (en) |
-
2013
- 2013-05-15 CN CN 201320261672 patent/CN203233173U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20140515 |