CN215498263U - Circuit with multiple surge protection - Google Patents
Circuit with multiple surge protection Download PDFInfo
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- CN215498263U CN215498263U CN202120836897.7U CN202120836897U CN215498263U CN 215498263 U CN215498263 U CN 215498263U CN 202120836897 U CN202120836897 U CN 202120836897U CN 215498263 U CN215498263 U CN 215498263U
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Abstract
The utility model discloses a circuit with multiple surge protection, which comprises a power supply circuit, a ground wire and a network wire; the power circuit comprises a positive bus and a negative bus; the network line comprises at least two signal lines; the power circuit also comprises a differential mode lightning arrester and a common mode lightning arrester; the positive bus and the negative bus are connected through a differential mode lightning arrester; the positive bus and the ground wire and the negative bus and the ground wire are connected through a common-mode lightning arrester; the network line also comprises a primary network lightning protector and a secondary network lightning protector; each signal line is connected to the ground wire through a primary network lightning protector, and two adjacent network lines are connected through a secondary network lightning protector. Compared with the prior art, the technical scheme that this application provided has the protection comprehensive: the protection has the advantages of multiple protection layers, good protection effect and the like.
Description
Technical Field
The utility model belongs to the technical field of lightning protection, and particularly relates to a lightning protection circuit arranged aiming at a circuit system with a power circuit and a network line coexisting.
Background
In a circuit system with a power supply and a network line in parallel or with a plurality of electrical appliances in various forms, the power supply line and the network line are often arranged separately, and when the lightning protection problem of the circuit system is considered, the prior art often only adopts a single form of lightning protection measure for the power supply line.
Taking the chinese patent application with patent application number "201821187428.1" as an example, the technical scheme disclosed in the patent application is that an ultra-wide voltage lightning protection dc-to-dc power supply adopts ceramic gas discharge tube GTD, transient suppression diode TVS, piezoresistor MOV and self-recovery fuse PTC to be connected with each other to form a transient discharge loop, and the transient discharge loop is connected into a common mode choke coil of an original circuit to realize the connection between an industrial power supply, an agricultural power supply and a photovoltaic power supply and an electric appliance.
The essence of taking lightning protection measures to each circuit in the circuit system lies in that the lightning protection component is reasonably arranged to the appointed circuit, and the transient energy in the circuit is prevented from causing impact to the original circuit device or the accessed electric appliance, and the technical scheme disclosed in the patent document shows that the lightning protection effect that the lightning protection measures in a single form can play is quite limited: in one aspect, only partial circuits in the circuit system are provided with lightning protection measures, and partial circuits which do not take the lightning protection measures cannot be effectively protected; on the other hand, the simple superposition of multiple lightning protection devices on the same line not only makes the devices on the line redundant and causes resource waste, but also greatly slows down the efficiency of the whole circuit system and greatly prolongs the recovery time of the line, but is not beneficial to the normal work of the line due to the existence of the processes of energy absorption, energy release, residual voltage absorption and energy release of a superior device, and energy absorption, energy release, and energy absorption and residual voltage release of a subordinate device between different lightning protection devices.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a circuit that can perform a comprehensive and multi-level surge protection on a power line and a network line when the power line and the network line are parallel in a circuit system.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a circuit with multiple surge protection comprises a power line, a ground line and a network line; the power circuit comprises a positive bus and a negative bus; the network line comprises at least two signal lines; the power circuit also comprises a differential mode lightning arrester and a common mode lightning arrester; the positive bus and the negative bus are connected through a differential mode lightning arrester; the positive bus and the ground wire and the negative bus and the ground wire are connected through a common-mode lightning arrester; the network line also comprises a primary network lightning protector and a secondary network lightning protector; each signal line is connected to the ground wire through a primary network lightning protector, and two adjacent network lines are connected through a secondary network lightning protector.
Furthermore, the power circuit also comprises a choke coil, the input end and the output end of each positive bus are connected through the choke coil, the input end and the output end of each negative bus are also connected through the choke coil, the choke coils are respectively arranged between the input end and the output end of the positive bus and between the input end and the output end of the negative bus, the parameters of the choke coils are reasonably selected, the viscosity of the electrical parameters of the choke coils can be fully utilized, and sudden voltage or sudden current which flees into the negative bus or the positive bus is blocked through a time-lag effect.
Furthermore, the common-mode lightning arrester comprises a front common-mode lightning protection module and a front common-mode fuse, the front common-mode lightning protection module comprises a front common-mode piezoresistor and a front common-mode gas discharge tube, and one end of the front common-mode piezoresistor is connected with the input end of the positive bus and the common end of the choke coil or the input end of the negative bus and the common end of the choke coil; the other end of the front common mode piezoresistor is connected with one end of the front common mode gas discharge tube, and the other end of the front common mode gas discharge tube is connected with a ground wire. One end of the front common mode fuse is connected with the positive bus input end and the common end of the choke coil or the negative bus input end and the common end of the choke coil, and the other end of the front common mode fuse is connected with the front common mode piezoresistor. Furthermore, the common-mode lightning arrester also comprises a rear common-mode lightning protection module, wherein the rear common-mode lightning protection module comprises a rear common-mode fuse, a rear common-mode piezoresistor and a rear common-mode gas discharge tube; one end of the rear common mode fuse is connected with the common end of the positive bus output end and the choke coil or the common end of the negative bus output end and the choke coil, the other end of the rear common mode fuse is connected with one end of the rear common mode piezoresistor, the other end of the rear common mode piezoresistor is connected with one end of the rear common mode gas discharge tube, and the other end of the rear common mode gas discharge tube is connected with the ground wire.
The front common mode module is used as first double common mode surge protection on the positive bus and the negative bus, and multi-level lightning protection is performed between the positive bus and the ground wire and between the negative bus and the ground wire: the front common mode fuse is placed at the forefront end, can be fused when the maximum instantaneous energy appears in the line or the energy is overloaded for a long time, and simply and directly plays a role in protecting the line; the front common mode piezoresistor arranged behind the front common mode piezoresistor has the characteristics of high response speed and voltage shock resistance, and can quickly respond to instantaneous high voltage or instantaneous heavy current fleeed in a circuit and intercept most energy when being applied to an anti-surge protection circuit of a positive bus or a negative bus; the front common-mode gas discharge tube is arranged behind the front common-mode piezoresistor, on one hand, the characteristics of slightly slow response speed and large through-current capacity of the front common-mode gas discharge tube are utilized, residual voltage is absorbed after following the front common-mode piezoresistor, on the other hand, the front common-mode gas discharge tube is arranged between the front common-mode piezoresistor and the ground wire, and on the other hand, the situation that instantaneous high voltage or instantaneous high current which possibly flees into the ground wire is counterstruck to a negative bus or a positive bus through a lightning protection circuit can be prevented, and the double protection effect is achieved.
For a power circuit, in the technical scheme provided by the application, a rear common mode module is particularly arranged besides a front common mode lightning protection module, the front common mode module, a choke coil and the rear common mode module are together arranged to form an arrangement mode of coarse voltage limiting of the front common mode module, secondary interference filtering of the choke coil and complete filtering of transient energy in the circuit by the rear common mode module, and further a gas discharge tube is arranged before a ground wire is connected to make anti-reverse-strike protection for the circuit, so that a comprehensive, multi-level and thorough surge protection circuit is constructed for the power circuit, and the normal work of the circuit is fully ensured.
The differential mode lightning protection device comprises a differential mode fuse and a differential mode piezoresistor, one end of the differential mode fuse is connected with the common end of the positive bus output end and the choke coil, the other end of the differential mode fuse is connected with one end of the differential mode piezoresistor, and the other end of the differential mode piezoresistor is connected with the common end of the negative bus output end and the choke coil. The common-mode lightning arrester and the differential-mode lightning arrester are separately arranged, so that the common-mode lightning arrester and the differential-mode lightning arrester can work independently, and more comprehensive and more stable surge protection work is provided for a circuit.
The primary network lightning protection device comprises a spark gap protection tube and a network gas discharge tube, one end of the spark gap protection tube is connected with a signal wire, the other end of the spark gap protection tube is connected with one end of the network gas discharge tube, and the other end of the network gas discharge tube is connected with a ground wire. The network gas discharge tube is arranged to block instantaneous large voltage or instantaneous large current on the line, and prevent transient energy fleeing into the ground wire from backstroke into the network line to carry out double protection on the network line. The secondary lightning protection device comprises a rectifying protector, and two input ends of the rectifying protector are respectively connected with two adjacent signal lines. The secondary lightning protection device also comprises a transient suppression diode, and two ends of the transient suppression diode are respectively connected with two adjacent signal lines.
The ground line is disposed between the power supply line and the network line. The ground wire is arranged between the power circuit and the network circuit, so that the distance between the power circuit and the ground wire and the distance between the network circuit and the ground wire can be ensured to be shortest as possible, the shorter grounding distance can reduce the probability of the whole circuit being interfered by the outside, and the stability and the reliability of the whole circuit system are further ensured.
Compared with the prior art, the technical scheme provided by the application has the following beneficial effects:
the protection is comprehensive: the technical scheme that this application provided is used in the parallel circuit system of power supply line and network line, and be different from only implementing the lightning protection measure of single form to power supply line among the prior art, in the circuit that this application provided, not only set up the lightning protection ware simultaneously to power supply line and network line, still set up common mode lightning protection measure and differential mode lightning protection measure simultaneously to power supply line, still set up elementary lightning protection measure and secondary lightning protection measure simultaneously to network line, the protection is very comprehensive.
The protection level is many, the protection effect is good: on one hand, in a front common-mode module, a rear common-mode module and a differential-mode lightning protector which are arranged on a power line, a circuit form that a plurality of lightning protection devices are connected in series is flexibly adopted, and each lightning protection line is constructed in multiple levels by combining the performances of different lightning protection devices such as response speed, voltage resistance, through-current capacity and the like, so that the damage of surge to the line is comprehensively blocked; on the other hand, the network circuit is also provided with a primary lightning protector and a secondary lightning protector, and the influence of instantaneous high voltage or instantaneous heavy current on the network circuit is weakened layer by layer through the matching of the spark gap protection tube, the network gas discharge tube, the rectifier protector and the transient suppression diode in the primary lightning protector and the secondary lightning protector, so that the operation safety of the network circuit is fully protected, and a good circuit protection effect is obtained.
Drawings
Fig. 1 is a circuit schematic of a circuit with multiple surge protection implemented in a first embodiment.
Fig. 2 is a schematic circuit diagram of a circuit with multiple surge protection implemented in the second embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
the first embodiment is as follows:
please refer to fig. 1.
In this embodiment, a circuit with multiple surge protection is provided, which includes a power line, a ground line PE, and a network line; the power circuit comprises a positive bus and a negative bus; the network line comprises at least two signal lines; the power circuit also comprises a differential mode lightning arrester and a common mode lightning arrester; the positive bus and the negative bus are connected through a differential mode lightning arrester; the positive bus and the ground wire PE are connected through a common-mode lightning arrester, and the negative bus and the ground wire PE are connected through a common-mode lightning arrester; the network line also comprises a primary network lightning protector and a secondary network lightning protector; each signal line is connected to the ground wire PE through a primary network lightning protector, and two adjacent network lines are connected through a secondary network lightning protector.
In this embodiment, the power line further includes a magnetic loop inductor L, an input end and an output end of each positive bus are connected through the magnetic loop inductor L, an input end and an output end of each negative bus are also connected through the magnetic loop inductor L, and the magnetic loop inductors L are respectively disposed between the input end and the output end of the positive bus and between the input end and the output end of the negative bus.
In this embodiment, further, the common-mode lightning arrester includes a front common-mode lightning protection module and a front common-mode fuse, the front common-mode lightning protection module includes a front common-mode voltage dependent resistor (MOV 1-MOV 2) and a front common-mode gas discharge tube GDT1, and one end of the front common-mode voltage dependent resistor (MOV 1-MOV 2) is connected to the positive bus input end and the common end of the magnetic loop inductor L or the negative bus input end and the common end of the magnetic loop inductor L; the other end of the front common mode piezoresistor (MOV 1-MOV 2) is connected with one end of the front common mode gas discharge tube GDT1, and the other end of the front common mode gas discharge tube GDT1 is connected with the ground wire PE. The front common mode fuse F1 is arranged on the positive bus, one end of the front common mode fuse F1 is connected with the input end of the positive bus and the common end of the magnetic loop inductor L, and the other end of the front common mode fuse F1 is connected with the corresponding front common mode piezoresistor (MOV 1-MOV 2).
In this embodiment, the common-mode lightning arrester further includes a rear common-mode lightning protection module, where the rear common-mode lightning protection module includes a rear common-mode fuse F2, rear common-mode voltage dependent resistors (MOV 3-MOV 4), and a rear common-mode gas discharge tube GDT 2; one end of the rear common mode resistor is connected with the input end of the positive electrode bus and the common end of the magnetic ring inductor L or the input end of the negative electrode bus and the common end of the magnetic ring inductor L, one end of the rear common mode piezoresistor (MOV 3-MOV 4) is connected with one end of the rear common mode gas discharge tube GDT2, and the other end of the rear common mode gas discharge tube GDT2 is connected with the ground wire PE. The rear common mode fuse F2 is arranged on the positive bus, one end of the rear common mode fuse F2 is connected with the output end of the positive bus and the common end of the magnetic loop inductor L, and the other end of the rear common mode fuse F2 is connected with one end of a rear common mode voltage dependent resistor (MOV 3-MOV 4).
In this embodiment, further, the differential mode lightning arrester includes a differential mode varistor MOV5, one end of the differential mode varistor MOV5 is connected to the common terminal of the positive bus output terminal and the magnetic loop inductor L, and the other end of the differential mode varistor MOV5 is connected to the common terminal of the negative bus output terminal and the magnetic loop inductor L.
In this embodiment, the network line further includes eight signal lines, wherein the primary network lightning arrester includes spark gap protection tubes (SPG 1-SPG 8) and a network gas discharge tube GDT3, and the specific types of the spark gap protection tubes (SPG 1-SPG 8) are: SCC-141N; one end of each of the spark gap protection tubes (SPG1 to SPG8) is connected to a signal line, the other end thereof is connected to one end of the network gas discharge tube GDT3, and the other end of the network gas discharge tube GDT3 is connected to the ground line PE.
In the embodiment, further, the secondary lightning protection device comprises two rectifier protectors (DB 1-DB 2) and two transient suppression diodes, wherein the specific model of the rectifier protector is DB107, the rectifier protectors (DB 1-DB 2) and the transient diodes are arranged between 1/2 and 3/6 signal lines in a group, and two input ends of the rectifier protectors are respectively connected with two adjacent signal lines. Two ends of the transient suppression diode are respectively connected with two output ends of the rectifier protector (DB 1-DB 2).
In the present embodiment, further, the ground line PE is provided between the power supply line and the network line.
The second embodiment is as follows:
please refer to fig. 2.
In this embodiment, a circuit with multiple surge protection is provided, which includes a power line, a ground line PE, and a network line; the power circuit comprises a positive bus and a negative bus; the network line comprises at least two signal lines; the power circuit also comprises a differential mode lightning arrester and a common mode lightning arrester; the positive bus and the negative bus are connected through a differential mode lightning arrester; the positive bus and the ground wire PE are connected through a common-mode lightning arrester, and the negative bus and the ground wire PE are connected through a common-mode lightning arrester; the network line also comprises a primary network lightning protector and a secondary network lightning protector; each signal line is connected to the ground wire PE through a primary network lightning protector, and two adjacent network lines are connected through a secondary network lightning protector.
In this embodiment, the power line further includes a choke inductor, the input end and the output end of each positive bus are connected through the choke inductor L, the input end and the output end of the negative bus are connected through the choke inductor L, and the choke inductors L are respectively disposed between the input end and the output end of the positive bus and between the input end and the output end of the negative bus.
In this embodiment, further, the common-mode lightning arrester includes a front common-mode lightning protection module and a front common-mode fuse (F1-F2), the front common-mode lightning protection module includes front common-mode voltage dependent resistors (MOV 1-MOV 2) and a front common-mode gas discharge tube GDT1, and one end of each of the front common-mode voltage dependent resistors (MOV 1-MOV 2) is connected to the positive bus input end and the common end of the choke inductor L or the negative bus input end and the common end of the choke inductor L; the other end of the front common mode piezoresistor (MOV 1-MOV 2) is connected with one end of the front common mode gas discharge tube GDT1, and the other end of the front common mode gas discharge tube GDT1 is connected with the ground wire PE. One end of each of the front common mode fuses (F1-F2) is connected with the common end of the positive bus input end and the choke inductor L or the common end of the negative bus input end and the choke inductor L, and the other end of each of the front common mode fuses (F1-F2) is connected with the front common mode piezoresistors (MOV 1-MOV 2).
In this embodiment, the common-mode lightning arrester further includes a rear common-mode lightning protection module, where the rear common-mode lightning protection module includes rear common-mode fuses (MOV 3-MOV 4), rear common-mode piezoresistors (MOV 3-MOV 4), and a rear common-mode gas discharge tube GDT 2; one end of a back common mode fuse (F3-F4) is connected with the common end of the positive electrode bus output end and the choke inductor L or the common end of the negative electrode bus output end and the choke inductor L, the other end of the back common mode fuse (F3-F4) is connected with one end of a back common mode piezoresistor (MOV 3-MOV 4), the other end of the back common mode piezoresistor (MOV 3-MOV 4) is connected with one end of a back common mode gas discharge tube GDT2, and the other end of the back common mode gas discharge tube GDT2 is connected with a ground wire PE.
In this embodiment, further, the differential mode lightning arrester includes a differential mode fuse F5 and a differential mode varistor MOV5, one end of the differential mode fuse F5 is connected to the common terminal of the positive bus output terminal and the choke inductor L, the other end of the differential mode fuse F5 is connected to one end of the differential mode varistor MOV5, and the other end of the differential mode varistor MOV5 is connected to the common terminal of the negative bus output terminal and the choke inductor L.
In this embodiment, the network line further includes eight signal lines, wherein the primary network lightning arrester includes a spark gap protection tube (SPG 1-SPG 8) and a network gas discharge tube GDT3, and the specific model of the spark gap protection tube is: SCC-141N; one end of each of the spark gap protection tubes (SPG1 to SPG8) is connected to a signal line, the other end thereof is connected to one end of the network gas discharge tube GDT3, and the other end of the network gas discharge tube GDT3 is connected to the ground line PE. The secondary lightning protection device comprises four rectifier protectors (DB 1-DB 4) and four transient suppression diodes (TVS 1-TVS 4), eight signal lines are arranged in sequence, the rectifier protectors (DB 1-DB 4) and the transient suppression diodes (TVS 1-TVS 4) are arranged between two adjacent signal lines in a group, two input ends of the rectifier protectors (DB 1-DB 4) in each group are respectively connected with two adjacent signal lines, and two ends of the transient suppression diodes (TVS 1-TVS 4) in each group are respectively connected with two adjacent signal lines.
In the present embodiment, further, the ground line PE is provided between the power supply line and the network line.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A circuit with multiple surge protection comprises a power line, a ground line and a network line; the power circuit comprises a positive bus and a negative bus; the network line comprises at least two signal lines;
the power supply circuit is characterized by also comprising a differential mode lightning arrester and a common mode lightning arrester; the positive bus and the negative bus are connected through the differential mode lightning arrester; the positive bus and the ground wire and the negative bus and the ground wire are connected through a common-mode lightning protector;
the network cable also comprises a primary network lightning protector and a secondary network lightning protector; each path of signal line is connected to the ground wire through the primary network lightning protector, and two adjacent paths of network lines are also connected through the secondary network lightning protector;
the power circuit also comprises a choke coil, the input end and the output end of each positive electrode bus are connected through the choke coil, and the input end and the output end of each negative electrode bus are also connected through the choke coil;
the common-mode lightning arrester comprises a front common-mode lightning arrester module, the front common-mode lightning arrester module comprises a front common-mode piezoresistor and a front common-mode gas discharge tube, and one end of the front common-mode piezoresistor is connected with the common end of the positive bus input end and the choke coil or the common end of the negative bus input end and the choke coil; the other end of the front common mode piezoresistor is connected with one end of the front common mode gas discharge tube, and the other end of the front common mode gas discharge tube is connected with a ground wire;
the front common-mode lightning protection module further comprises a front common-mode fuse, one end of the front common-mode fuse is connected with the positive bus input end and the common end of the choke coil or the negative bus input end and the common end of the choke coil, and the other end of the front common-mode fuse is connected with the front common-mode piezoresistor.
2. The circuit with multiple surge protection according to claim 1, wherein the common mode lightning arrester further comprises a rear common mode lightning protection module, the rear common mode lightning protection module comprises a rear common mode fuse, a rear common mode varistor, and a rear common mode gas discharge tube; one end of the rear common mode fuse is connected with the common end of the positive bus output end and the choke coil or the common end of the negative bus output end and the choke coil, the other end of the rear common mode fuse is connected with one end of the rear common mode piezoresistor, the other end of the rear common mode piezoresistor is connected with one end of the rear common mode gas discharge tube, and the other end of the rear common mode gas discharge tube is connected to the ground wire.
3. The circuit with multiple surge protection according to claim 1, wherein said differential mode lightning arrester comprises a differential mode fuse and a differential mode varistor, one end of said differential mode fuse is connected to said positive bus output terminal and said common terminal of said choke coil, the other end of said differential mode fuse is connected to one end of said differential mode varistor, and the other end of said differential mode varistor is connected to said negative bus output terminal and said common terminal of said choke coil.
4. The circuit with multiple surge protection according to claim 1, wherein said primary network lightning protector comprises a spark gap protection tube and a network gas discharge tube, one end of said spark gap protection tube is connected to a signal line, and the other end of said spark gap protection tube is connected to one end of said network gas discharge tube, and the other end of said network gas discharge tube is connected to a ground line.
5. The circuit with multiple surge protection according to claim 4, wherein said secondary network lightning protector comprises a rectifying protector, and two input terminals of said rectifying protector are respectively connected to two adjacent signal lines.
6. The circuit with multiple surge protection functions of claim 5, wherein said secondary network lightning arrester further comprises a transient suppression diode, and two ends of said transient suppression diode are respectively connected to two adjacent signal lines.
7. The circuit with multiple surge protection devices of claim 1, wherein said ground line is disposed between said power line and said network line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120836897.7U CN215498263U (en) | 2021-04-22 | 2021-04-22 | Circuit with multiple surge protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120836897.7U CN215498263U (en) | 2021-04-22 | 2021-04-22 | Circuit with multiple surge protection |
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| CN215498263U true CN215498263U (en) | 2022-01-11 |
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