CN214479596U - Lightning surge suppression circuit and alarm system - Google Patents
Lightning surge suppression circuit and alarm system Download PDFInfo
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- CN214479596U CN214479596U CN202120595530.0U CN202120595530U CN214479596U CN 214479596 U CN214479596 U CN 214479596U CN 202120595530 U CN202120595530 U CN 202120595530U CN 214479596 U CN214479596 U CN 214479596U
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- lightning surge
- suppression circuit
- piezoresistor
- resistor
- discharge tube
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Abstract
The utility model provides a thunderbolt surge suppression circuit and alarm system. The first suppression circuit comprises an alternating current input voltage, a fuse, a first voltage dependent resistor and a filter capacitor; the second suppression circuit comprises a discharge tube, a second piezoresistor and a third piezoresistor, and is connected with the first suppression circuit in parallel; the lightning surge has a set value, and when the lightning surge is smaller than the set value, the lightning surge passes through the alternating current input voltage and enters the first piezoresistor through the fuse to absorb the lightning surge; when the lightning surge is larger than the set value, the lightning surge passes through the alternating current input voltage and then enters the second piezoresistor, the discharge tube and the third piezoresistor through the fuse to absorb the lightning surge. The lightning surge suppression circuit and the alarm system solve the problem that the lightning surge suppression circuit in the prior art cannot flexibly deal with large current and small current.
Description
Technical Field
The utility model belongs to the technical field of lightning surge suppression circuit technique and specifically relates to a lightning surge suppression circuit and alarm system are related to.
Background
The lightning surge suppression circuit has the advantages that large lightning current can be generated when lightning happens, power equipment can be damaged, a lightning protection device is needed to protect in order to reduce loss caused by lightning, and the existing lightning surge suppression circuit cannot flexibly deal with large current and small current.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a thunderbolt surge suppression circuit and alarm system, this thunderbolt surge suppression circuit and alarm system can solve among the prior art problem that the thunderbolt surge suppression circuit can not deal with heavy current and undercurrent in a flexible way.
In order to achieve the above object, the present invention provides the following technical solutions:
a lightning surge suppression circuit comprising:
the first suppression circuit comprises an alternating current input voltage, a fuse, a first voltage dependent resistor and a filter capacitor;
the second suppression circuit comprises a discharge tube, a second piezoresistor and a third piezoresistor, and is connected with the first suppression circuit in parallel; the lightning surge has a set value, and when the lightning surge is smaller than the set value, the lightning surge passes through the alternating current input voltage and enters the first piezoresistor through the fuse to absorb the lightning surge; and when the lightning surge is larger than the set value, the lightning surge passes through the alternating current input voltage and then enters the second piezoresistor, the discharge tube and the third piezoresistor through the fuse to absorb the lightning surge.
On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:
further, the alternating current input voltage has a first terminal and a second terminal, the first terminal is an L pole, and the second terminal is an N pole.
Further, the fuse is connected in parallel with the first voltage dependent resistor.
Further, the second voltage dependent resistor and the third voltage dependent resistor are connected in series with the discharge tube.
Further, the discharge tube is grounded to discharge electric energy.
A lightning surge warning system comprising:
the first suppression circuit comprises an alternating current input voltage, a fuse, a first voltage dependent resistor and a filter capacitor;
the second suppression circuit comprises a discharge tube, a second piezoresistor and a third piezoresistor, and is connected with the first suppression circuit in parallel; the lightning surge has a set value, and when the lightning surge is smaller than the set value, the lightning surge passes through the alternating current input voltage and enters the first piezoresistor through the fuse to absorb the lightning surge; when the lightning surge is larger than the set value, the lightning surge passes through the alternating current input voltage, then enters the second piezoresistor, the discharge tube and the third piezoresistor through the fuse and absorbs the lightning surge;
and the alarm circuit is connected with the second suppression circuit in series, when the second suppression circuit is in overvoltage, the discharge tube discharges, the alarm circuit is conducted with the second suppression circuit, and the alarm circuit outputs an alarm signal.
Further, the alarm circuit comprises a first resistor, a second resistor and a third resistor, the second resistor and the third resistor are connected in parallel, and the second resistor and the third resistor are respectively connected with the first resistor in series.
The utility model has the advantages of as follows:
the lightning surge suppression circuit in the utility model absorbs smaller lightning surge through the first suppression circuit and absorbs larger lightning surge through the second suppression circuit; the problem of among the prior art thunderbolt surge suppression circuit can not deal with heavy current and undercurrent in a flexible way is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is the embodiment of the utility model provides an embodiment lightning surge suppression circuit and alarm system's schematic structure diagram.
Description of reference numerals:
the circuit comprises a first suppression circuit 10, a fuse 101, a first voltage dependent resistor 102, a filter capacitor 103, a second suppression circuit 20, a discharge tube 201, a second voltage dependent resistor 202, a third voltage dependent resistor 203, an alarm circuit 30, a first resistor 301, a second resistor 302 and a third resistor 303.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, a lightning surge suppression circuit includes:
a first suppression circuit 10 including an ac input voltage, a fuse 101, a first varistor 102, and a filter capacitor 103;
a second suppression circuit 20, which includes a discharge tube 201, a second voltage dependent resistor 202 and a third voltage dependent resistor 203, and the second suppression circuit 20 is connected in parallel with the first suppression circuit 10; a lightning surge has a set value, and when the lightning surge is smaller than the set value, the lightning surge passes through the alternating-current input voltage and then enters the first piezoresistor 102 through the fuse 101 to absorb the lightning surge; when the lightning surge is larger than the set value, the lightning surge passes through the alternating current input voltage, then enters the second voltage dependent resistor 202, the discharge tube 201 and the third voltage dependent resistor 203 through the fuse 101, and absorbs the lightning surge.
Because the discharge tube 201 has residual voltage, if the discharge tube 201 with higher residual voltage is selected (to satisfy 1.7 times of the highest input voltage), the ignition breakdown voltage of the discharge tube 201 will be very high, which may not play an overvoltage protection role for some devices requiring lower protection voltage, so the discharge tube 201 with lower residual voltage can be selected to be used in series with the varistor, so the threshold of surge voltage can be reduced, and at the same time, the discharge tube 201 also plays a certain protection role for the varistor (the voltage applied to the two ends of the varistor is relatively reduced).
On the basis of the technical scheme, the utility model discloses can also do as follows the improvement:
further, the alternating current input voltage has a first terminal and a second terminal, the first terminal is an L pole, and the second terminal is an N pole. L is a phase line, called the hot line; n is a neutral line, also known as the zero line;
further, the fuse 101 is connected in parallel with the first voltage dependent resistor 102.
Further, the second voltage dependent resistor 202 and the third voltage dependent resistor 203 are connected in series with the discharge tube 201.
Further, the discharge tube 201 is grounded to discharge electric energy.
A lightning surge warning system comprising:
a first suppression circuit 10 including an ac input voltage, a fuse 101, a first varistor 102, and a filter capacitor 103;
a second suppression circuit 20, which includes a discharge tube 201, a second voltage dependent resistor 202 and a third voltage dependent resistor 203, and the second suppression circuit 20 is connected in parallel with the first suppression circuit 10; a lightning surge has a set value, and when the lightning surge is smaller than the set value, the lightning surge passes through the alternating-current input voltage and then enters the first piezoresistor 102 through the fuse 101 to absorb the lightning surge; when the lightning surge is larger than the set value, the lightning surge passes through the alternating current input voltage, then passes through the fuse 101, enters the second piezoresistor 202, the discharge tube 201 and the third piezoresistor 203, and absorbs the lightning surge;
and an alarm circuit 30 connected in series with the second suppression circuit 20, wherein when the second suppression circuit 20 is over-voltage, the discharge tube 201 discharges, the alarm circuit 30 is conducted with the second suppression circuit 20, and the alarm circuit 30 outputs an alarm signal.
The varistor itself has a large leakage current due to its large parasitic capacitance, while the gas discharge tube 201 has a small leakage current, so that the system has almost no leakage current. In the absence of transient voltage, the discharge tube 201 isolates the MOV1 and MOV2 from the alarm circuit 30, MOV1 is the second varistor 202, MOV2 is the third varistor 203, and MOV3 is the first varistor 102, so that the branch leakage current is extremely low. When overvoltage occurs, the discharge tube 201 discharges at the time when the voltage drop generated by the discharge tube 201 is low, and the second varistor 202 and the third varistor 203 mainly act at the time. The interference returns to the off state after passing, and the second varistor 202 and the third varistor 203 are separated from the ground. If the second voltage dependent resistor 202 and the third voltage dependent resistor 203 are short-circuited during the process of absorbing surge energy, they can be separated by the gas discharge tube 201.
In addition, in the communication circuit, the second voltage dependent resistor 202 and the third voltage dependent resistor 203 must be connected in series with the discharge tube 201, because the distributed capacitance of the second voltage dependent resistor 202 and the third voltage dependent resistor 203 is very large (hundreds PF to thousands PF), and the distributed capacitance of the discharge tube 201 is very small (only a few PF), which does not short-circuit the signal. Further, the alarm circuit 30 includes a first resistor 301, a second resistor 302, and a third resistor 303, where the second resistor 302 and the third resistor 303 are connected in parallel, and the second resistor 302 and the third resistor 303 are respectively connected in series with the first resistor 301.
The alarm circuit is provided with a section of sampling resistor and alarms by sampling; the lightning surge suppression circuit and the alarm system can ensure the normal work of the equipment when the equipment is subjected to small lightning stroke, and do not damage the equipment when the equipment is subjected to large lightning stroke; and lightning stroke alarming is carried out through the sampling resistor, and the lightning stroke appears in the application environment of the equipment.
The lightning surge suppression circuit and the alarm system are used as follows:
when the safety device is used, an operator connects the first piezoresistor 102 and the fuse 101 in parallel, connects the second piezoresistor 202 and the third piezoresistor 203 in series with the discharge tube 201, connects the second suppression circuit 20 in parallel with the first suppression circuit 10, and connects the alarm circuit 30 in series with the second suppression circuit 20.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include more than one of the feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. A lightning surge suppression circuit, comprising:
the first suppression circuit comprises an alternating current input voltage, a fuse, a first voltage dependent resistor and a filter capacitor;
the second suppression circuit comprises a discharge tube, a second piezoresistor and a third piezoresistor, and is connected with the first suppression circuit in parallel; the lightning surge has a set value, and when the lightning surge is smaller than the set value, the lightning surge passes through the alternating current input voltage and enters the first piezoresistor through the fuse to absorb the lightning surge; and when the lightning surge is larger than the set value, the lightning surge passes through the alternating current input voltage and then enters the second piezoresistor, the discharge tube and the third piezoresistor through the fuse to absorb the lightning surge.
2. The lightning surge suppression circuit of claim 1, wherein said ac input voltage has a first terminal and a second terminal, said first terminal being an L-pole and said second terminal being an N-pole.
3. The lightning surge suppression circuit of claim 1, wherein said fuse is connected in parallel with said first varistor.
4. The lightning surge suppression circuit of claim 1, wherein said second varistor and said third varistor are connected in series with said discharge tube.
5. The lightning surge suppression circuit of claim 1, wherein said discharge tube is grounded to discharge electrical energy.
6. A lightning surge warning system, comprising:
the first suppression circuit comprises an alternating current input voltage, a fuse, a first voltage dependent resistor and a filter capacitor;
the second suppression circuit comprises a discharge tube, a second piezoresistor and a third piezoresistor, and is connected with the first suppression circuit in parallel; the lightning surge has a set value, and when the lightning surge is smaller than the set value, the lightning surge passes through the alternating current input voltage and enters the first piezoresistor through the fuse to absorb the lightning surge; when the lightning surge is larger than the set value, the lightning surge passes through the alternating current input voltage, then enters the second piezoresistor, the discharge tube and the third piezoresistor through the fuse and absorbs the lightning surge;
and the alarm circuit is connected with the second suppression circuit in series, when the second suppression circuit is in overvoltage, the discharge tube discharges, the alarm circuit is conducted with the second suppression circuit, and the alarm circuit outputs an alarm signal.
7. The lightning surge warning system of claim 6, wherein the warning circuit comprises a first resistor, a second resistor and a third resistor, the second resistor and the third resistor are connected in parallel, and the second resistor and the third resistor are respectively connected in series with the first resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120595530.0U CN214479596U (en) | 2021-03-24 | 2021-03-24 | Lightning surge suppression circuit and alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120595530.0U CN214479596U (en) | 2021-03-24 | 2021-03-24 | Lightning surge suppression circuit and alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214479596U true CN214479596U (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120595530.0U Active CN214479596U (en) | 2021-03-24 | 2021-03-24 | Lightning surge suppression circuit and alarm system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214479596U (en) |
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2021
- 2021-03-24 CN CN202120595530.0U patent/CN214479596U/en active Active
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