CN220570323U - Lightning protection circuit of gas detector and gas detector - Google Patents
Lightning protection circuit of gas detector and gas detector Download PDFInfo
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- CN220570323U CN220570323U CN202322265791.8U CN202322265791U CN220570323U CN 220570323 U CN220570323 U CN 220570323U CN 202322265791 U CN202322265791 U CN 202322265791U CN 220570323 U CN220570323 U CN 220570323U
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- 230000001052 transient effect Effects 0.000 claims description 10
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- 238000001514 detection method Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 230000036632 reaction speed Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
The application relates to a lightning protection circuit of a gas detector and the gas detector, wherein the protection circuit comprises a terminal board, a first diode, a second diode, a third diode and a resistor; the No. 3 pin and the No. 5 pin of the terminal board are respectively and electrically connected with a 24V power supply and the ground, the No. 4 pin of the terminal board is a signal pin, one end of the first diode is electrically connected with the No. 3 pin of the terminal board, and the other end of the first diode is electrically connected with one end of the second diode and one end of the third diode; one end of the second diode is electrically connected with one end of the third diode, and the other end of the second diode is electrically connected with the No. 4 pin of the terminal board; one end of the third diode is grounded, and the other end of the third diode is electrically connected with the No. 5 pin of the terminal board. The resistor both ends are electric connection terminal plate No. 3 pins, no. 4 pins and No. 5 pins arbitrary two pins respectively. When induced lightning hits the cable, the diode and resistor clamp the voltage to the terminal plate, which transmits the voltage to the gas detector.
Description
Technical Field
The application relates to the field of gas detectors, in particular to a lightning protection circuit of a gas detector and the gas detector.
Background
When the gas detector monitors thunderstorm weather, lightning is easy to induce, so that circuit board devices are damaged, and most of the gas detector can be provided with lightning protection equipment. Wherein, lightning protection device protects gas detector through connecting wire and binding post connection. When detecting in thunderstorm weather, the induced lightning hits the connecting wire, the induced current is great, and the line resistance of connecting wire is not 0Ω even less, leads to the connecting wire to produce coupling voltage, therefore current gas detector lightning protection equipment is not ideal to the protection effect of gas detector components and parts after suffering the thunderstorm hits, is difficult to satisfy the demand that the user used in the thunderstorm sky.
Disclosure of Invention
In view of this, the present application provides a lightning protection circuit of a gas detector and the gas detector to solve the above problems.
According to an aspect of the present application, there is provided a lightning protection circuit of a gas detector, comprising: a terminal plate, a first diode, a second diode, a third diode, and a resistor;
the No. 1 pin and the No. 2 pin of the terminal board are electrically connected with a gas detection internal circuit, the No. 3 pin of the terminal board is electrically connected with a 24V power supply, the No. 4 pin of the terminal board is a signal output pin, and the No. 5 pin of the terminal board is grounded;
one end of the first diode is electrically connected with a No. 3 pin of the terminal board, and the other end of the first diode is electrically connected with one end of the second diode and one end of the third diode;
one end of the second diode is electrically connected with one end of the third diode, and the other end of the second diode is electrically connected with the No. 4 pin of the terminal board;
one end of the third diode is grounded, and the other end of the third diode is electrically connected with the No. 5 pin of the terminal board;
and two ends of the resistor are respectively and electrically connected with any two pins of the No. 3 pin, the No. 4 pin and the No. 5 pin of the terminal board.
In one possible implementation, the resistance is more than two.
In one possible implementation manner, the three resistors are respectively a first resistor, a second resistor and a third resistor;
one end of the first resistor is electrically connected with a No. 3 pin of the terminal board and one end of the first diode; the other end of the first resistor is electrically connected with the No. 4 pin of the terminal board and the other end of the second diode;
one end of the second resistor is electrically connected with the No. 3 pin of the terminal board and one end of the first resistor, and the other end of the second resistor is electrically connected with the No. 5 pin of the terminal board and the other end of the third diode;
one end of the third resistor is electrically connected with the No. 4 pin of the terminal board and the other end of the second diode, and the other end of the third resistor is electrically connected with the No. 5 pin of the terminal board and the other end of the second resistor.
In one possible implementation, the first diode, the second diode, and the third diode are transient suppression diodes.
In one possible implementation, the resistors are piezoresistors.
In one possible implementation, the terminal plate is 9.5-6P-type.
In one possible implementation, the first diode, the second diode, and the third diode are all HFC-030L-Z type.
In one possible implementation, the resistances are all 330KD10.
According to another aspect of the present application, there is provided a gas detector comprising a lightning protection circuit of the gas detector described above.
The beneficial effects of this application:
the application provides a lightning protection circuit of gas detector, include: terminal plate, first diode, second diode, third diode. The No. 3 pin of the terminal board is electrically connected with a 24V power supply through a cable, the No. 4 pin of the terminal board outputs signals outwards through the cable, and the No. 5 pin of the terminal board is electrically connected with a ground wire through the cable. When induced lightning hits any cable on the terminal board, the cable generates larger coupling voltage due to induced current, the voltage is transmitted to the terminal board, and the terminal board clamps the voltage through the diode on other pins, so that the final output voltage is within the application range of the internal circuit of the gas detector, and the requirements that the internal circuit of the gas detector is normally used and components are not damaged are met.
Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the present application and together with the description, serve to explain the principles of the present application.
Fig. 1 shows a circuit diagram of a lightning protection circuit of a gas detector according to an embodiment of the present application.
Detailed Description
Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
It should be understood, however, that the terms "center," "longitudinal," "transverse," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like indicate or are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description or to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The word "exemplary" is used herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
In addition, numerous specific details are set forth in the following detailed description in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements, and circuits have not been described in detail as not to unnecessarily obscure the present application.
Fig. 1 shows a circuit diagram of a lightning protection circuit of a gas detector according to an embodiment of the present application.
As shown in fig. 1, the lightning protection circuit of the gas detector includes: a terminal board Z3, a first diode TVS1, a second diode TVS2, a third diode TVS3, and a resistor;
the pin 1 and the pin 2 of the terminal board Z3 are electrically connected with a gas detection internal circuit, the pin 3 of the terminal board Z3 is electrically connected with a 24V power supply, the pin 4 of the terminal board Z3 is a signal output pin, and the pin 5 of the terminal board Z3 is grounded;
one end of the first diode TVS1 is electrically connected to the pin No. 3 of the terminal board Z3, and the other end of the first diode TVS1 is electrically connected to one end of the second diode and one end of the third diode;
one end of the second diode TVS2 is electrically connected to one end of the third diode TVS3, and the other end of the second diode TVS2 is electrically connected to pin No. 4 of the terminal board Z3;
one end of the third diode TVS3 is grounded, and the other end of the third diode TVS3 is electrically connected to pin No. 5 of the terminal board Z3;
and two ends of the resistor are respectively and electrically connected with any two pins of the No. 3 pin, the No. 4 pin and the No. 5 pin of the terminal board Z3.
The lightning protection circuit of the gas detector and the gas detector comprise a terminal plate Z3, a first diode TVS1, a second diode TVS2, a third diode TVS3 and a resistor, when induced lightning hits a cable externally connected with a No. 3 pin, a No. 4 pin and a No. 5 pin of the terminal plate Z3, due to overlarge induced current, larger voltage is generated on the cable, the instantaneous high energy impacts the diode connected with the terminal plate Z3, the diode converts the high impedance of the diode into low impedance, the instantaneous high energy is absorbed, so that the voltage is clamped in a certain range, meanwhile, the short circuit can be caused due to the fact that the diode is converted into the low impedance, the voltage is divided by the electric connection resistor on any two pins among the No. 3 pin, the No. 4 pin and the No. 5 pin of the terminal plate Z3, and the extra current is absorbed to protect the diode, and the circuit is kept to work normally, and the terminal plate Z3 provides proper voltage to the internal circuit of the gas detector.
In one possible implementation, the resistance is more than two. Two ends of one resistor are respectively electrically connected with any two pins of the No. 3 pin, the No. 4 pin and the No. 5 pin of the terminal plate Z3, one end of the residual resistor is electrically connected with the pin which is not connected with the resistor in the No. 3 pin, the No. 4 pin and the No. 5 pin of the terminal plate Z3, and the other end of the residual resistor is electrically connected with the pin which is not electrically connected with the resistor in the No. 3 pin, the No. 4 pin and the No. 5 pin of the terminal plate Z3.
In one possible implementation manner, the three resistors are respectively a first resistor RV1, a second resistor RV2 and a third resistor RV3;
one end of the first resistor RV1 is electrically connected to the pin No. 3 of the terminal board Z3 and one end of the first diode TVS 1; the other end of the first resistor RV1 is electrically connected with the No. 4 pin of the terminal board Z3 and the other end of the second diode TVS 2;
one end of the second resistor RV2 is electrically connected to the pin No. 3 of the terminal board Z3 and one end of the first resistor RV1, and the other end of the second resistor RV2 is electrically connected to the pin No. 5 of the terminal board Z3 and the other end of the third diode TVS 3;
one end of the third resistor RV3 is electrically connected to the No. 4 pin of the terminal board Z3 and the other end of the second diode TVS2, and the other end of the third resistor RV3 is electrically connected to the No. 5 pin of the terminal board Z3 and the other end of the second resistor RV 2.
In one possible implementation, the first diode TVS, the second diode TVS2, and the third diode TVS3 are all transient suppression diodes. The transient suppression diode has the characteristics of high reaction speed, small volume, larger pulse power, clamping voltage and the like. The series values of the pulse power, the pulse peak current and the working voltage are quite large, and the requirements of circuits with different voltages can be met. The bidirectional suppressor diode is suitable for use in an ac circuit, and the unidirectional suppressor diode is suitable for use in a dc circuit, and the bidirectional transient suppressor diode is preferred in the present application.
In one possible implementation, the resistors are piezoresistors. Piezoresistors are a type of voltage-sensitive nonlinear overvoltage protection semiconductor element.
In one possible implementation, the terminal plate Z3 is 9.5-6P-type. The terminal board Z3 with 6 pins is clearly and simply distributed, wherein the No. 6 pins of the terminal board Z3 are grounded.
In one possible implementation, the first diode TVS1, the second diode TVS2, and the third diode TVS3 are all HFC-030L-Z type. The rated current is 10KA, the rated voltage is 30V, and the circuit requirement is met.
In one possible implementation, the resistances are all 330KD10.
In summary, the No. 3 pin, the No. 4 pin and the No. 5 pin on the terminal board Z3 are externally connected with the cable, the No. 3 pin provides a 24V power supply for the terminal board Z3, when the induced lightning hits the cable, a larger induced current is generated, on one hand, the No. 4 pin of the terminal board Z3 transmits a lightning signal of 4-20mA outwards, on the other hand, the two poles of the transient suppression diode are subjected to reverse transient high-energy impact, the transient suppression diode is changed from original high-impedance to low-impedance due to the characteristics of the transient suppression diode, the transient overcurrent caused by the abnormal overvoltage is discharged through the grounding terminal pin on the terminal end and the diode, and meanwhile, the abnormal overvoltage is clamped within a safe level bearable by a back-stage circuit, so that the back-stage circuit is protected from being damaged by the abnormal overvoltage. The piezoresistor divides voltage for the circuit through the electric current simultaneously, and if the voltage at two ends of the piezoresistor is greater than the resistance value of the piezoresistor, the piezoresistor is conducted, the line current becomes great, and the fuse is burnt out, so that the electric appliance is protected from being damaged due to high voltage.
According to another aspect of the present application, there is provided a gas detector comprising a lightning protection circuit of the gas detector described above.
It should be noted that, although the lightning protection device of the gas detector and the gas detector are described above by taking the present embodiment as an example, those skilled in the art can understand that the present application should not be limited thereto. In fact, the user can flexibly set the types of the diode and the resistor according to personal preference and/or practical application scenes, so long as the diode and the resistor are reasonable.
The embodiments of the present application have been described above, the foregoing description is exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. A lightning protection circuit for a gas detector, comprising: a terminal plate, a first diode, a second diode, a third diode, and a resistor;
the No. 1 pin and the No. 2 pin of the terminal board are electrically connected with a gas detection internal circuit, the No. 3 pin of the terminal board is electrically connected with a 24V power supply, the No. 4 pin of the terminal board is a signal output pin, and the No. 5 pin of the terminal board is grounded;
one end of the first diode is electrically connected with a No. 3 pin of the terminal board, and the other end of the first diode is electrically connected with one end of the second diode and one end of the third diode;
one end of the second diode is electrically connected with one end of the third diode, and the other end of the second diode is electrically connected with the No. 4 pin of the terminal board;
one end of the third diode is grounded, and the other end of the third diode is electrically connected with the No. 5 pin of the terminal board;
and two ends of the resistor are respectively and electrically connected with any two pins of the No. 3 pin, the No. 4 pin and the No. 5 pin of the terminal board.
2. The lightning protection circuit of a gas detector according to claim 1, wherein the resistance is two or more.
3. The lightning protection circuit of the gas detector according to claim 1, wherein the three resistors are a first resistor, a second resistor and a third resistor respectively;
one end of the first resistor is electrically connected with a No. 3 pin of the terminal board and one end of the first diode; the other end of the first resistor is electrically connected with the No. 4 pin of the terminal board and the other end of the second diode;
one end of the second resistor is electrically connected with the No. 3 pin of the terminal board and one end of the first resistor, and the other end of the second resistor is electrically connected with the No. 5 pin of the terminal board and the other end of the third diode;
one end of the third resistor is electrically connected with the No. 4 pin of the terminal board and the other end of the second diode, and the other end of the third resistor is electrically connected with the No. 5 pin of the terminal board and the other end of the second resistor.
4. The lightning protection circuit of a gas detector of claim 1, wherein the first diode, the second diode, and the third diode are transient suppression diodes.
5. A lightning protection circuit for a gas detector according to any one of claims 1 to 3 wherein the resistors are piezoresistors.
6. The lightning protection circuit of a gas detector according to claim 1, wherein the terminal plate is 9.5-6P-type.
7. The lightning protection circuit of a gas detector of claim 1, wherein the first diode, the second diode, and the third diode are all HFC-030L-Z type.
8. A lightning protection circuit for a gas detector according to any of claims 1-3, wherein the resistances are each 330KD10.
9. A gas detector comprising a lightning protection circuit of the gas detector of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322265791.8U CN220570323U (en) | 2023-08-22 | 2023-08-22 | Lightning protection circuit of gas detector and gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322265791.8U CN220570323U (en) | 2023-08-22 | 2023-08-22 | Lightning protection circuit of gas detector and gas detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220570323U true CN220570323U (en) | 2024-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322265791.8U Active CN220570323U (en) | 2023-08-22 | 2023-08-22 | Lightning protection circuit of gas detector and gas detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220570323U (en) |
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2023
- 2023-08-22 CN CN202322265791.8U patent/CN220570323U/en active Active
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