CN203086133U - Lightning prevention and surge current prevention circuit - Google Patents
Lightning prevention and surge current prevention circuit Download PDFInfo
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- CN203086133U CN203086133U CN 201320025230 CN201320025230U CN203086133U CN 203086133 U CN203086133 U CN 203086133U CN 201320025230 CN201320025230 CN 201320025230 CN 201320025230 U CN201320025230 U CN 201320025230U CN 203086133 U CN203086133 U CN 203086133U
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- mode inductance
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- suppression diode
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Abstract
The utility model relates to a lightning prevention and surge current prevention circuit which comprises a piezoresistor, a transient suppression diode, a fuse and a common mode inductor. The piezoresistor and the transient suppression diode are connected in parallel between a first end of a first coil and a first end of a second coil of the common mode inductor. A negative pole of the transient suppression diode is connected with the first end of the first coil of the common mode inductor. A positive pole of the transient suppression diode is connected with the first end of the second coil of the common mode inductor. The first end of the first coil of the common mode inductor is further connected with a direct current power supply. The first end of the second coil of the common mode inductor is further connected with the analog ground. The second end of the first coil of the common mode inductor is connected with power supply voltage. The second end of the second coil of the common mode inductor is connected with the ground. The first end of the first coil and the first end of the second coil of the common mode inductor are same polarity ends. The lightning prevention and surge current prevention circuit provided by the utility model can effectively protect a device and has the advantages of lightning prevention, surge current prevention, strong circuit anti-interference performance and simple structure.
Description
Technical field
The utility model relates to electronic technology field, particularly a kind of protective circuit that is used for the anti-lightning strike and anti-surge electric current of car-mounted terminal.
Background technology
Existing lightning prevention circuit adopts gas discharge tube (Gas Discarge tube is called for short GDT) usually, is used to protect responsive telecommunication apparatus box electronic equipment.
Gas discharge tube is a high-impedance state in normal condition, can not influence the operate as normal of circuit; When the instantaneous surge current that thunderbolt or operation of equipment cause took place, gas discharge tube can switch to low impedance state, thereby energy is shifted from protected sensitive equipment, thereby prevented to be struck by lightning or damage that surge current causes device.But the price of gas discharge tube is generally somewhat expensive, and the reaction time is long.
Surge current is meant power connection moment, flows into the peak current of power-supply device.Because input filter capacitor charges rapidly, so this peak current is far longer than the stable state input current.
The utility model content
Technical problem to be solved in the utility model provides a kind of simple in structure, anti-lightning strike, the anti-surge circuit of practical and reliable.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of anti-lightning strike in-rush current limiting circuit, comprise piezo-resistance RV, Transient Suppression Diode D, fuse F, common mode inductance T, described piezo-resistance RV and Transient Suppression Diode D are connected in parallel between first end of first end of described common mode inductance first coil and described common mode inductance second coil, the negative pole of described Transient Suppression Diode D connects first end of described common mode inductance first coil, and the positive pole of described Transient Suppression Diode D connects first end of described common mode inductance second coil; First end of described common mode inductance first coil also is connected with DC power supply DC, first end of described common mode inductance second coil also connects simulation ground AGND, second end of described common mode inductance first coil is connected with supply voltage VCC, the second end ground connection GND of described common mode inductance second coil, first end of first end of described common mode inductance first coil and described common mode inductance second coil is a homopolar end.
Described homopolar end be meant first coil some moments current potential be timing, second coil also one fixes on same moment a current potential is arranged is positive corresponding end, at this moment we are called these two corresponding end the homopolar end of this equipment coil.
Further, be connected with four electric capacity in parallel between second end of second end of described common mode inductance first coil and described common mode inductance second coil.
Further, described each electric capacity is 0.1 microfarad.
Further, described common mode inductance T is 5 milihenries.
The beneficial effects of the utility model are: effective reliably protecting equipment, anti-lightning strike, anti-current surge, circuit strong interference immunity and simple in structure.
Description of drawings
Fig. 1 is used for the anti-lightning strike anti-surge current circuit figure of intelligent vehicle mounted terminal for embodiment;
Fig. 2 is the current time figure of voltage valve among the embodiment.
In the accompanying drawing, the list of parts of each label representative is as follows:
1, first end of common mode inductance first coil, 2, second end of common mode inductance first coil, 3, first end of common mode inductance second coil, 4, second end of common mode inductance second coil.
Embodiment
Below in conjunction with accompanying drawing principle of the present utility model and feature are described, institute gives an actual example and only is used to explain the utility model, is not to be used to limit scope of the present utility model.
Fig. 1 is the anti-lightning strike anti-surge current circuit figure that is used for intelligent vehicle mounted terminal, and as shown in Figure 1, anti-lightning strike anti-surge current circuit comprises piezo-resistance RV, Transient Suppression Diode D, fuse F, common mode inductance T.First end 1 of described common mode inductance first coil and first end 3 of second coil are arranged in into electric loop, and second end 2 of described common mode inductance first coil and second end 4 of second coil are arranged in electric loop.Wherein piezo-resistance RV and Transient Suppression Diode D are connected in parallel between first end 3 of first end 1 of common mode inductance first coil and common mode inductance second coil, the negative pole of Transient Suppression Diode D connects first end 1 of described common mode inductance first coil, and the positive pole of Transient Suppression Diode D connects first end 3 of common mode inductance second coil.The Transient Suppression Diode model is SMAJ16CA in the present embodiment, and the piezo-resistance model is 7D180.Be connected with the electric capacity of four parallel connections between second end 2 of described common mode inductance first coil and second end 4 of second coil.Four electric capacity parallel connections, i.e. first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3,4 parallel connections of the 4th capacitor C.Four capacitor's capacities are 0.1 microfarad.First end 1 of common mode inductance first coil is connected with DC power supply DC, and first end 3 of common mode inductance second coil connects simulation ground AGND, and second end 2 of common mode inductance first coil is connected with supply voltage VCC, second end, the 4 ground connection GND of common mode inductance second coil.First end 1 of common mode inductance first coil is a homopolar end with first end 3 of common mode inductance second coil.Common mode inductance T is 5 milihenries.
In vehicle-mounted circuit, all power supplies are the automobile generating motor and provide to the automobile storage battery charging by rectifier, thereby supply power voltage, electric current can change with the operation conditions of car and produce burr voltage and impulse current in this process, power supply transfers to common mode inductance T from DC power supply DC end input via fuse F, the piezo-resistance RV of 18 volts of parallel connection directs and 16 volts Transient Suppression Diode D between DC power supply DC and common mode inductance T.Piezo-resistance RV in parallel and Transient Suppression Diode D form the voltage valve, compare with input voltage, and when input voltage surpassed 16 volts, the impulse current that produces a 100A in 10 nanoseconds was illustrated in figure 2 as the current time figure of voltage valve by described voltage valve.The impulse current of 100A makes the two poles of the earth of Transient Suppression Diode D be subjected to reverse transient state high energy impact events; the high impedance of its two interpolar is become Low ESR, cause the circuit short circuit of common mode inductance T left-hand component among Fig. 1, thereby fuse F blows; thereby play a protective role, guarantee the voltage nonoverload.4 0.1uF electric capacity in parallel are formed filter circuit after the common mode inductance, and the voltage ripple of guaranteeing input VCC is in 200mV.Transient Suppression Diode D can also be with the big electric current Direct Filtration of burr owing to factor moment generations such as static or power supply circuits interfering noises.
Common mode inductance plays the electromagnetic interference signal effect of filtering common mode.When the normal current in the circuit was flowed through common mode inductance, electric current produced reverse magnetic field and cancels out each other in the inductance coil of same-phase coiling, and this moment, the normal signal electric current mainly was subjected to the influence (with the damping that causes because of leakage inductance on a small quantity) of coil resistance; When the common mode current flowing through coil, because the same tropism of common mode current understands the induction reactance that produces magnetic field in the same way in coil and increase coil, make coil show as high impedance, produce stronger damping, with this attenuation common-mode electric current, reach the purpose of filtering.
The electric capacity of common mode inductance T and four parallel connections (C1, C2, C3, C4) plays the effect of isolating energy storage filtering, with the noise removing in the circuit, makes circuit strengthen anti-interference.
The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (4)
1. anti-lightning strike in-rush current limiting circuit, it is characterized in that: comprise piezo-resistance RV, Transient Suppression Diode D, fuse F, common mode inductance T, described piezo-resistance RV and Transient Suppression Diode D are connected in parallel between first end of first end of described common mode inductance first coil and described common mode inductance second coil, the negative pole of described Transient Suppression Diode D connects first end of described common mode inductance first coil, and the positive pole of described Transient Suppression Diode D connects first end of described common mode inductance second coil; First end of described common mode inductance first coil also is connected with DC power supply DC, first end of described common mode inductance second coil also connects simulation ground AGND, second end of described common mode inductance first coil is connected with supply voltage VCC, the second end ground connection GND of described common mode inductance second coil, first end of first end of described common mode inductance first coil and described common mode inductance second coil is a homopolar end.
2. a kind of anti-lightning strike in-rush current limiting circuit according to claim 1 is characterized in that: be connected with four electric capacity in parallel between second end of second end of described common mode inductance first coil and described common mode inductance second coil.
3. a kind of anti-lightning strike in-rush current limiting circuit according to claim 2 is characterized in that: described each electric capacity is 0.1 microfarad.
4. a kind of anti-lightning strike in-rush current limiting circuit according to claim 1 and 2 is characterized in that: described common mode inductance T is 5 milihenries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320025230 CN203086133U (en) | 2013-01-17 | 2013-01-17 | Lightning prevention and surge current prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320025230 CN203086133U (en) | 2013-01-17 | 2013-01-17 | Lightning prevention and surge current prevention circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203086133U true CN203086133U (en) | 2013-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320025230 Expired - Fee Related CN203086133U (en) | 2013-01-17 | 2013-01-17 | Lightning prevention and surge current prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203086133U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680432A (en) * | 2014-12-03 | 2016-06-15 | 西门子公司 | Electrical facility and apparatus for protecting electrical facility |
-
2013
- 2013-01-17 CN CN 201320025230 patent/CN203086133U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680432A (en) * | 2014-12-03 | 2016-06-15 | 西门子公司 | Electrical facility and apparatus for protecting electrical facility |
| US10074974B2 (en) | 2014-12-03 | 2018-09-11 | Siemens Aktiengesellschaft | Electrical facility and arrangement for protecting the electrical facility |
| CN105680432B (en) * | 2014-12-03 | 2018-09-21 | 西门子公司 | Device and electrical equipment for protecting electrical equipment |
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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: 20130724 Termination date: 20200117 |
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| CF01 | Termination of patent right due to non-payment of annual fee |