CN112510667A - Electromagnetic pulse protection circuit and equipment - Google Patents
Electromagnetic pulse protection circuit and equipment Download PDFInfo
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- CN112510667A CN112510667A CN202011262592.6A CN202011262592A CN112510667A CN 112510667 A CN112510667 A CN 112510667A CN 202011262592 A CN202011262592 A CN 202011262592A CN 112510667 A CN112510667 A CN 112510667A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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Abstract
The utility model provides an electromagnetic pulse protection circuit and equipment relates to electromagnetic protection technical field, can protect the electromagnetic pulse of multiple complicacy, protects the operation of back-end equipment reliable and stable. The specific technical scheme is as follows: the input end of the bleeder circuit is connected with an electromagnetic pulse signal, the output end of the bleeder circuit is connected with the input end of the voltage-controlled circuit, the output end of the voltage-controlled circuit is connected with the input end of the primary clamping circuit, the output end of the primary clamping circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the output end of the secondary clamping circuit, and the output end of the secondary clamping circuit outputs a signal. The invention is used for electromagnetic protection.
Description
Technical Field
The present disclosure relates to electromagnetic protection technologies, and in particular, to an electromagnetic pulse protection circuit and an electromagnetic pulse protection device.
Background
The battlefield space in the future is increasingly complex, the transition is gradually carried out from a platform central station to a network central station, the network central battle is a battle concept driven by information advantages, decision makers and executors can share information through a sensor network distributed in the battlefield, and the battle system ensures that rapid command is carried out for combined battle at proper time and place to obtain overwhelming battle effect. However, computers, networks, radio stations, power supply equipment, various sensors, detection, early warning, navigation satellites, aircrafts, naval vessels and the like which are relied on by the network center are not based on electronic equipment, and after electromagnetic pulses act on the electronic equipment, lightning loss, communication interruption, computer failure and missile control failure can be caused instantly, so that a command control system is greatly damaged. This is a great threat to future wars that rely heavily on electronic information devices.
The electromagnetic environment of modern battlefield is often a complex electromagnetic environment formed by the combined action of various electromagnetic energy, the transmitting power of military radar and communication equipment is getting larger and larger, the frequency spectrum is gradually widened, so that the electromagnetic environment of battlefield becomes more complex, and the electromagnetic environment of battlefield space becomes worse and worse due to the wide application of electronic battle system and the appearance of electromagnetic pulse (EMP) weapons and High Power Microwave (HPM) weapons. From a formal point of view, electromagnetic pulse sources are mainly classified into electrostatic discharge electromagnetic pulses, lightning electromagnetic pulses, nuclear electromagnetic pulses and other non-nuclear electromagnetic pulses. The existing protection technology has a certain protection effect on single electromagnetic pulse protection such as electrostatic discharge or lightning electromagnetic pulse, but the protection effect on various complex electromagnetic pulses is not very obvious.
Disclosure of Invention
The embodiment of the disclosure provides an electromagnetic pulse protection circuit and equipment, which can protect various complex electromagnetic pulses and protect the stable and reliable operation of the post-stage equipment. The technical scheme is as follows:
according to a first aspect of the embodiments of the present disclosure, there is provided an electromagnetic pulse protection circuit, including: the voltage-controlled circuit comprises a current-discharging circuit, a voltage-controlled circuit, a primary voltage clamping circuit, a filter circuit and a secondary voltage clamping circuit;
the input end of the bleeder circuit is connected with an electromagnetic pulse signal, the output end of the bleeder circuit is connected with the input end of the voltage-controlled circuit, the output end of the voltage-controlled circuit is connected with the input end of the primary clamping circuit, the output end of the primary clamping circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the output end of the secondary clamping circuit, and the output end of the secondary clamping circuit outputs a signal.
In one embodiment, the bleeder circuit comprises: the first piezoresistor, the second piezoresistor, the third piezoresistor, the first gas discharge tube and the second gas discharge tube;
the first piezoresistor and the first gas discharge tube are connected in series and then bridged between a first terminal and a second terminal of the electromagnetic pulse signal transmission line; the second voltage dependent resistor and the third voltage dependent resistor are connected in series and then bridged between the first terminal and the second terminal of the electromagnetic pulse signal transmission line; the connecting end of the second piezoresistor and the third piezoresistor is connected with one end of the second gas discharge tube, and the other end of the second gas discharge tube is grounded through a lead.
In one embodiment, a voltage control circuit includes: the voltage control circuit comprises a first voltage control unit and a second voltage control unit, wherein the first voltage control unit comprises a first resistor and/or a first inductor, and the second voltage control unit comprises a second resistor and/or a second inductor;
when the first voltage control unit comprises a first resistor or a first inductor, the first resistor or the first inductor is connected to a first terminal of the electromagnetic pulse signal transmission line;
when the first voltage control unit comprises a first resistor and a first inductor, the first resistor and the first inductor are connected in series and then connected to a first terminal of the electromagnetic pulse signal transmission line;
when the second voltage control unit comprises a second resistor or a second inductor, the second resistor or the second inductor is connected to the second terminal of the electromagnetic pulse signal transmission line;
when the second voltage control unit comprises a second resistor and a second inductor, the second resistor and the second inductor are connected in series and then connected to the second terminal of the electromagnetic pulse signal transmission line.
In one embodiment, the first resistor and the second resistor are common resistors or thermistors.
In one embodiment, the primary clamping circuit comprises: a first transient suppression diode, a second transient suppression diode, and a third transient suppression diode;
the first transient suppression diode and the second transient suppression diode are connected in series and then bridged between a first terminal and a second terminal of an electromagnetic pulse signal transmission line, and the connecting end of the first transient suppression diode and the second transient suppression diode is grounded through a conducting wire; a third transient suppression diode is connected across the electromagnetic pulse signal transmission line between the first terminal and the second terminal.
In one embodiment, the filtering circuit comprises at least one filtering unit comprising: the common-mode inductor comprises a first capacitor, a common-mode inductor, a second capacitor, a third inductor and a fourth inductor;
the first capacitor and the common mode inductor are connected in parallel and then bridged between a first terminal and a second terminal of the electromagnetic pulse signal transmission line; the second capacitor and the third capacitor are connected in series and then bridged between the first terminal and the second terminal of the electromagnetic pulse signal transmission line, and the connecting end of the second capacitor and the third capacitor is grounded through a lead; the third inductor is connected to the first terminal of the electromagnetic pulse signal transmission line, and the fourth inductor is connected to the second terminal of the electromagnetic pulse signal transmission line.
In one embodiment, the secondary clamping circuit includes: a fourth transient suppression diode, a fifth transient suppression diode, and a sixth transient suppression diode;
the fourth transient suppression diode and the fifth transient suppression diode are connected in series and then bridged between the first terminal and the second terminal of the electromagnetic pulse signal transmission line, and the connection end of the fourth transient suppression diode and the fifth transient suppression diode is grounded; a sixth transient suppression diode is connected across the electromagnetic pulse signal transmission line between the first terminal and the second terminal.
In one embodiment, the secondary clamping circuit includes: a first electrostatic impeder, a second electrostatic impeder, and a third electrostatic impeder;
the first electrostatic impedance device and the second electrostatic impedance device are connected in series and then bridged between a first terminal and a second terminal of the electromagnetic pulse signal transmission line, and the connecting end of the first electrostatic impedance device and the second electrostatic impedance device is grounded; a third electrostatic impeder is connected across the electromagnetic pulse signal transmission line between the first terminal and the second terminal.
According to a second aspect of embodiments of the present disclosure, there is provided an electromagnetic pulse protection apparatus, comprising: the electromagnetic pulse protection circuit comprises a shielding shell, a shell cover plate, a stud and a PCB (printed circuit board), wherein the PCB is arranged in the shielding shell and comprises the electromagnetic pulse protection circuit described in the first aspect and any embodiment of the first aspect; the stud comprises a first hollow stud and a second hollow stud;
the shielding shell is a cavity in a shape of a Chinese character 'ji' with mounting lugs, a shell cover plate and the shielding shell are welded to form a sealed cavity, an input wire inlet hole is formed in the shell wall on one side of the shielding shell, and a first hollow stud is welded on the shielding shell through the input wire inlet hole; an output wire outlet hole is formed in the shell cover plate, and the second hollow stud is welded to the shell cover plate through the output wire outlet hole.
In one embodiment, a partition is welded in the shielding shell, and the partition divides the shielding shell into a first cavity and a second cavity; the partition board is provided with at least one through hole, each through hole is provided with a feedthrough capacitor, the feedthrough capacitors are arranged on the through holes in a mode of penetrating through the partition board, the input ends of the feedthrough capacitors are connected with the output ends of the secondary clamping circuit, the output ends of the feedthrough capacitors are connected with an output cable, and the output cable is output through an output wire outlet hole and a second stud;
the shell cover plate comprises a first cover plate and a second cover plate, an output wire outlet hole is formed in the first cover plate, the first cover plate corresponds to the first cavity, the second cover plate corresponds to the second cavity, and an input wire inlet hole is formed in the shell wall on one side of the second cavity.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic block diagram of an electromagnetic pulse protection circuit provided by an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an electromagnetic pulse protection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an electromagnetic pulse protection apparatus provided in an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an electromagnetic pulse protection apparatus provided in an embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The embodiment of the present disclosure provides an electromagnetic pulse protection circuit, as shown in fig. 1, the electromagnetic pulse protection circuit includes: a bleeder circuit 101, a voltage control circuit 102, a primary clamping circuit 103, a filter circuit 104 and a secondary clamping circuit 105;
the input end of the bleeder circuit 101 is connected with an electromagnetic pulse input signal, the output end of the bleeder circuit 101 is connected with the input end of the voltage-controlled circuit 102, the output end of the voltage-controlled circuit 102 is connected with the input end of the primary clamping circuit 103, the output end of the primary clamping circuit 103 is connected with the input end of the filter circuit 104, the output end of the filter circuit 104 is connected with the output end of the secondary clamping circuit 105, and the output end of the secondary clamping circuit 105 outputs a signal.
The following describes each sub-circuit in the electromagnetic pulse protection circuit in detail.
Referring to fig. 2, the bleeder circuit 101 comprises: a first varistor RV1, a second varistor RV2, a third varistor RV3, a first gas discharge tube GDT1(gas discharge tube) and a second gas discharge tube GDT 2;
the first piezoresistor RV1 and the first gas discharge tube GDT1 are connected IN series and then are connected between the first terminal IN + and the second terminal IN-of the electromagnetic pulse signal transmission line IN a bridge connection mode; the second piezoresistor RV2 and the third piezoresistor RV3 are connected IN series and then are bridged between a first terminal IN + and a second terminal IN-of the electromagnetic pulse signal transmission line; the connecting ends of the second piezoresistor RV2 and the third piezoresistor RV3 are connected with one end of a second gas discharge tube GDT2, and the other end of the second gas discharge tube GDT is grounded by a lead wire PE.
Referring to fig. 2, the voltage control circuit 102 includes: a first voltage control unit 1021 and a second voltage control unit 1022, the first voltage control unit 1021 including a first resistor R1 and/or a first inductor L1, the second voltage control unit 1022 including a second resistor R2 and/or a second inductor L2;
when the first voltage control unit 1021 includes the first resistor R1 or the first inductor L1, the first resistor R1 or the first inductor L1 is connected to the first terminal IN + of the electromagnetic pulse signal transmission line;
when the first voltage control unit 1021 comprises the first resistor R1 and the first inductor L1, the first resistor R1 and the first inductor L1 are connected IN series and then connected to the first terminal IN + of the electromagnetic pulse signal transmission line;
when the second voltage control unit 1022 includes the second resistor R2 or the second inductor L2, the second resistor R2 or the second inductor L2 is connected to the second terminal IN "of the electromagnetic pulse signal transmission line;
when the second voltage control unit 1022 includes the second resistor R2 and the second inductor L2, the second resistor R2 and the second inductor L2 are connected IN series and then connected to the second terminal IN-of the electromagnetic pulse signal transmission line.
The first resistor R1 and the second resistor R2 may be ordinary resistors or thermistors. In fig. 2, the first voltage control unit 1021 includes a first resistor R1, the second voltage control unit 1022 includes a second resistor R2, and the first resistor R1 and the second resistor R2 are common resistors.
Referring to fig. 2, the primary clamping circuit 103 includes: a first Transient suppression diode TVS1(Transient Voltage supressor), a second Transient suppression diode TVS2 and a third Transient suppression diode TVS 3;
the first transient suppression diode TVS1 and the second transient suppression diode TVS2 are connected IN series and then bridged between a first terminal IN + and a second terminal IN-of the electromagnetic pulse signal transmission line, and the connection end of the first transient suppression diode TVS1 and the second transient suppression diode TVS2 is grounded PE through a wire; a third transient suppression diode TVS3 is connected across the electromagnetic pulse signal transmission line between the first terminal IN + and the second terminal IN-.
In the disclosed embodiment, the filtering circuit 104 includes at least one filtering unit 1041. Referring to fig. 2, the filter circuit including one filter unit is exemplified. Wherein, the filtering unit 1041 includes: the inductor comprises a first capacitor C1, a common mode inductor LX, a second capacitor C2, a third capacitor C3, a third inductor L3 and a fourth inductor L4;
the first capacitor C1 and the common mode inductor LX are connected IN parallel and then are connected across the first terminal and the second terminal IN-of the electromagnetic pulse signal transmission line; the second capacitor C2 and the third capacitor C3 are connected IN series and then bridged between the first terminal IN + and the second terminal IN-of the electromagnetic pulse signal transmission line, and the connecting end of the second capacitor C2 and the third capacitor C3 is grounded through a wire PE; the third inductor L3 is connected to the first terminal IN + of the electromagnetic pulse signal transmission line and the fourth inductor L4 is connected to the second terminal IN-of the electromagnetic pulse signal transmission line.
Referring to fig. 2, the secondary clamping circuit 105 includes: a fourth transient suppression diode TVS4, a fifth transient suppression diode TVS5 and a sixth transient suppression diode TVS 6;
the fourth transient suppression diode TVS4 and the fifth transient suppression diode TVS5 are connected IN series and then bridged between the first terminal IN + and the second terminal IN-of the electromagnetic pulse signal transmission line, and the connection end of the fourth transient suppression diode TVS4 and the fifth transient suppression diode TVS5 is grounded PE through a wire; a sixth transient suppression diode TVS6 is connected across the electromagnetic pulse signal transmission line between the first terminal IN + and the second terminal IN-.
For the secondary clamping circuit, the transient suppression diode may be replaced by an electrostatic discharge (ESD), specifically, the secondary clamping circuit 105 includes: a first electrostatic resistor ESD1, a second electrostatic resistor ESD2, and a third electrostatic resistor ESD 3;
the first electrostatic resistor ESD1 and the second electrostatic resistor ESD2 are connected IN series and then bridged between a first terminal IN + and a second terminal IN-of the electromagnetic pulse signal transmission line, and the connecting end of the first electrostatic resistor ESD1 and the second electrostatic resistor ESD2 is grounded through a wire PE; a third electrostatic impeder ESD3 is connected across the electromagnetic pulse signal transmission line between the first terminal IN + and the second terminal IN-.
Note that OUT + and OUT-are signal outputs.
In combination with the electromagnetic pulse protection circuit shown in fig. 1 and 2, a gas discharge tube, a transient suppression diode, a piezoresistor, a thermistor, a capacitor, an inductor and other devices are adopted, and the multifunctional combined electromagnetic pulse protection circuit is designed by utilizing the advantages of large flow of the gas discharge tube, high response speed of the transient suppression diode, good filtering effect of the capacitor and the inductor and the like. When electromagnetic pulse occurs, the advantages of the devices can be fully utilized, respective protection functions are exerted, electromagnetic pulse interference is filtered, and therefore stable and reliable operation of the post-stage equipment is protected.
Specifically, the electromagnetic pulse protection circuit provided in the embodiment of the present disclosure, for various electromagnetic pulse interference sources (mainly different in rising edge time), utilizes a multistage protection circuit, and uses a voltage control circuit to sequentially operate a primary clamping circuit and a current leakage circuit, so as to reduce residual voltage and residual current, perform differential mode and common mode filtering through a filter circuit, and finally reduce residual voltage and residual current to the minimum through a secondary clamping circuit (the clamping voltage is reduced compared with the primary clamping circuit of the previous stage), so as to filter electromagnetic pulse interference, thereby protecting the stable and reliable operation of the subsequent stage device.
The electromagnetic pulse protection circuit provided by the embodiment of the present disclosure, for the electrostatic discharge electromagnetic pulse, has a slower response speed than the nuclear electromagnetic pulse, and can complete the protection function by generally adopting the bleeder circuit 101, the voltage control circuit 102 and the primary clamping circuit 103. However, for an electromagnetic pulse with an extremely high response speed, a combined circuit of the bleeder circuit 101, the voltage control circuit 102, the primary clamping circuit 103, the filter circuit 104, and the secondary clamping circuit 105 is required to be used for protection.
Specifically, when an electromagnetic pulse occurs, since the primary clamp circuit 103 has a high response speed, the primary clamp circuit 103 generally operates in advance to clamp a voltage at a constant voltage and discharge a part of current to the ground, and a large current needs to be discharged from the bleeder circuit 101 because the primary clamp circuit 103 has a general discharge capability.
The bleeder circuit 101 is composed of a voltage dependent resistor and a gas discharge tube, and the two have relatively low response speeds, and the voltages at the two ends can only act when meeting the action voltage. The voltage control circuit and the filter circuit are designed to solve the problem of low response speed, and voltage division is generated through the voltage control circuit, so that the voltage meets the action requirement; the rising edge time of the electromagnetic pulse is delayed by a filter circuit so as to meet the response time of the piezoresistor. Through this circuit, the bleeder circuit 101 operates to bleed a large current to ground. After the electromagnetic pulse interference passes through the bleeder circuit 101, the voltage control circuit 102 and the primary clamping circuit 103, the residual voltage and the residual current are greatly reduced. At this time, the residual voltage in the circuit is safe, but the residual current is large, and further limitation is needed. Then, after the differential mode, common mode, high frequency filtering and the like of the filter circuit 104, and finally the secondary clamping circuit 105, the clamping parameters of the part are reduced compared with those of the previous stage, and the output signal meets the requirements of the equipment of the next stage. After the circuit is adopted, the electromagnetic pulse interference is greatly reduced, and the subsequent equipment is protected from being damaged.
The electromagnetic pulse protection circuit provided by the embodiment of the disclosure can not only protect against single electrostatic discharge electromagnetic pulse and lightning electromagnetic pulse, but also against high-speed nuclear electromagnetic pulse and complex multiple electromagnetic pulses. The primary clamping circuit and the bleeder circuit sequentially act through the voltage control circuit and the filter circuit, the bleeder circuit with low response speed is immediately conducted after the primary clamping circuit acts, most of current is discharged by the bleeder circuit, and meanwhile, through the design of the secondary clamping circuit, the residual voltage is reduced to the minimum again after common mode and differential mode protection of the filter circuit. Through the combined action of the multistage protection circuit, the electromagnetic pulse interference can be effectively filtered, and the protection performance is improved, so that the stable and reliable operation of the subsequent equipment is protected.
Referring to fig. 3 to 4, an embodiment of the present disclosure further provides an electromagnetic pulse protection device, where the electromagnetic pulse protection device includes a shielding shell 20, a shell cover plate 30, a stud 40, and a PCB circuit board, where a PCB circuit board is disposed in the shielding shell 20, and the PCB circuit board includes an electromagnetic pulse protection circuit described in the embodiment corresponding to fig. 1 to 2; the studs 40 comprise a first hollow stud 401 and a second hollow stud 402.
The shielding shell 20 is a cavity which is shaped like a Chinese character 'ji' and is provided with mounting lugs, the cover plate 30 and the shielding shell 40 are welded to form a sealed cavity, an input wire inlet hole A is formed in the shell wall on one side of the shielding shell 20, and the first hollow stud 401 is welded on the shielding shell 20 through the input wire inlet hole A; an output outlet hole B is formed in the shell cover plate 30, and the second hollow stud 402 is welded to the shell cover plate 30 through the output outlet hole B. The input cable is connected to the input end of the leakage circuit of the electromagnetic pulse protection circuit through the first hollow stud 401 and the input wire inlet hole a, the output end of the secondary clamping circuit is connected with the output cable, and the output cable is output through the output wire outlet hole B and the second hollow stud 402. In addition, the positions of the input wire inlet hole A and the output wire outlet hole B can be adjusted according to actual needs.
Further, a partition plate 50 is welded in the shielding shell 20, and the shielding shell 20 is divided into a first cavity 501 and a second cavity 502 by the partition plate 50; the partition plate 50 is provided with at least one through hole, each through hole is provided with a feedthrough capacitor, the feedthrough capacitor is arranged on each through hole in a manner of penetrating through the partition plate, the input end of the feedthrough capacitor is connected with the output end of the secondary clamping circuit, the output end of the feedthrough capacitor is connected with an output cable, and the output cable is output through an output wire outlet hole B (not shown in FIG. 3) and the second hollow stud 402;
the housing cover plate 30 includes a first cover plate 301 and a second cover plate 302, the first cover plate 301 is provided with an output wire hole B, the first cover plate 301 corresponds to the first cavity 501, the second cover plate 302 corresponds to the second cavity 502, and the housing wall at one side of the second cavity 502 is provided with an input wire hole a.
It should be noted that the purpose of the partition board and the feedthrough capacitor is to connect the power lines or the signal lines of the two cavities, and to filter out the conducted interference to be filtered out by grounding to the housing.
In the embodiment of the present disclosure, the shielding shell 20 and the shell cover 30 may be formed by bending and welding a stainless steel plate with a thickness of 2 mm. Further, a first hollow stud 401 may be spot-welded on the first cover plate 301, and a second hollow stud 402 may be spot-welded on the second cover plate 302; the material of the first hollow stud 401 and the second hollow stud 402 is stainless steel, and in addition, the first hollow stud 401 may be a stud with an unfinished thread.
Further, when the electromagnetic pulse protection device is installed on the panel, the second hollow stud 402 penetrates through the panel, the bottom (namely, one side of the cover plate) is tightly attached to the panel, the installation lug is provided with a through hole 201, and the periphery of the installation lug is fastened by screws. Wherein, the second hollow stud 402 is designed with screw thread, and is fastened by nut on the other side of the panel.
According to the electromagnetic pulse protection equipment provided by the embodiment of the disclosure, the shielding shell and the shell cover plate are welded to form the sealed cavity, and the first cavity and the second cavity are formed through the partition plate, so that an electromagnetic pulse signal can be better shielded.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. An electromagnetic pulse protection circuit, comprising: the voltage-controlled circuit comprises a current-discharging circuit, a voltage-controlled circuit, a primary voltage clamping circuit, a filter circuit and a secondary voltage clamping circuit;
the input end of the bleeder circuit is connected with an electromagnetic pulse signal, the output end of the bleeder circuit is connected with the input end of the voltage-controlled circuit, the output end of the voltage-controlled circuit is connected with the input end of the primary clamping circuit, the output end of the primary clamping circuit is connected with the input end of the filter circuit, the output end of the filter circuit is connected with the output end of the secondary clamping circuit, and the output end of the secondary clamping circuit outputs a signal.
2. The circuit of claim 1, wherein the bleeder circuit comprises: the first piezoresistor, the second piezoresistor, the third piezoresistor, the first gas discharge tube and the second gas discharge tube;
the first piezoresistor and the first gas discharge tube are connected in series and then bridged between a first terminal and a second terminal of an electromagnetic pulse signal transmission line; the second piezoresistor and the third piezoresistor are connected in series and then bridged between the first terminal and the second terminal of the electromagnetic pulse signal transmission line; the connecting end of the second piezoresistor and the third piezoresistor is connected with one end of the second gas discharge tube, and the other end of the second gas discharge tube is grounded through a lead.
3. The circuit of claim 1, wherein the voltage control circuit comprises: the voltage control circuit comprises a first voltage control unit and a second voltage control unit, wherein the first voltage control unit comprises a first resistor and/or a first inductor, and the second voltage control unit comprises a second resistor and/or a second inductor;
when the first voltage control unit comprises a first resistor or a first inductor, the first resistor or the first inductor is connected to a first terminal of the electromagnetic pulse signal transmission line;
when the first voltage control unit comprises a first resistor and a first inductor, the first resistor and the first inductor are connected in series and then connected to a first terminal of the electromagnetic pulse signal transmission line;
when the second voltage control unit comprises a second resistor or a second inductor, the second resistor or the second inductor is connected to a second terminal of the electromagnetic pulse signal transmission line;
when the second voltage control unit comprises a second resistor and a second inductor, the second resistor and the second inductor are connected in series and then connected to a second terminal of the electromagnetic pulse signal transmission line.
4. The circuit of claim 3, wherein the first resistor and the second resistor are common resistors or thermistors.
5. The circuit of claim 1, wherein the primary clamping circuit comprises: a first transient suppression diode, a second transient suppression diode, and a third transient suppression diode;
the first transient suppression diode and the second transient suppression diode are connected in series and then bridged between a first terminal and a second terminal of the electromagnetic pulse signal transmission line, and the connecting end of the first transient suppression diode and the second transient suppression diode is grounded through a conducting wire; the third transient suppression diode is connected across the electromagnetic pulse signal transmission line between the first terminal and the second terminal.
6. The circuit of claim 1, wherein the filtering circuit comprises at least one filtering unit, the filtering unit comprising: the common-mode inductor comprises a first capacitor, a common-mode inductor, a second capacitor, a third inductor and a fourth inductor;
the first capacitor and the common mode inductor are connected in parallel and then bridged between a first terminal and a second terminal of the electromagnetic pulse signal transmission line; the second capacitor and the third capacitor are connected in series and then bridged between a first terminal and a second terminal of the electromagnetic pulse signal transmission line, and the connecting end of the second capacitor and the third capacitor is grounded through a conducting wire; the third inductor is connected to the first terminal of the electromagnetic pulse signal transmission line, and the fourth inductor is connected to the second terminal of the electromagnetic pulse signal transmission line.
7. The circuit of claim 1, wherein the secondary clamping circuit comprises: a fourth transient suppression diode, a fifth transient suppression diode, and a sixth transient suppression diode;
the fourth transient suppression diode and the fifth transient suppression diode are connected in series and then bridged between the first terminal and the second terminal of the electromagnetic pulse signal transmission line, and the connection end of the fourth transient suppression diode and the fifth transient suppression diode is grounded; the sixth transient suppression diode is connected across the electromagnetic pulse signal transmission line between the first terminal and the second terminal.
8. The circuit of claim 1, wherein the secondary clamping circuit comprises: a first electrostatic impeder, a second electrostatic impeder, and a third electrostatic impeder;
the first electrostatic impedance device and the second electrostatic impedance device are connected in series and then bridged between a first terminal and a second terminal of the electromagnetic pulse signal transmission line, and the connecting end of the first electrostatic impedance device and the second electrostatic impedance device is grounded; the third electrostatic impeder is connected across the electromagnetic pulse signal transmission line between the first terminal and the second terminal.
9. An electromagnetic pulse protection device is characterized by comprising a shielding shell, a shell cover plate, a stud and a PCB (printed Circuit Board), wherein the PCB is arranged in the shielding shell, and the PCB comprises an electromagnetic pulse protection circuit according to any one of claims 1 to 8; the studs comprise a first hollow stud and a second hollow stud;
the shielding shell is a cavity in a shape of a Chinese character 'ji' with mounting lugs, the shell cover plate and the shielding shell are welded to form a sealed cavity, an input wire inlet hole is formed in the shell wall on one side of the shielding shell, and the first hollow stud is welded on the shielding shell through the input wire inlet hole; an output wire outlet hole is formed in the shell cover plate, and the second hollow stud is welded to the shell cover plate through the output wire outlet hole.
10. An electromagnetic pulse protection device according to claim 9,
a partition plate is welded in the shielding shell and divides the shielding shell into a first cavity and a second cavity; the partition board is provided with at least one through hole, each through hole is provided with a feedthrough capacitor, the feedthrough capacitors are arranged on each through hole in a manner of penetrating through the partition board, the input ends of the feedthrough capacitors are connected with the output ends of the secondary clamping circuit, the output ends of the feedthrough capacitors are connected with output cables, and the output cables are output through output wire outlet holes and the second studs;
the shell cover plate comprises a first cover plate and a second cover plate, an output wire outlet hole is formed in the first cover plate, the first cover plate corresponds to the first cavity, the second cover plate corresponds to the second cavity, and an input wire inlet hole is formed in the shell wall on one side of the second cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011262592.6A CN112510667A (en) | 2020-11-12 | 2020-11-12 | Electromagnetic pulse protection circuit and equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011262592.6A CN112510667A (en) | 2020-11-12 | 2020-11-12 | Electromagnetic pulse protection circuit and equipment |
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| CN112510667A true CN112510667A (en) | 2021-03-16 |
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| CN202011262592.6A Pending CN112510667A (en) | 2020-11-12 | 2020-11-12 | Electromagnetic pulse protection circuit and equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865057A (en) * | 2021-03-19 | 2021-05-28 | 厦门赛尔特电子有限公司 | Electromagnetic protection circuit |
| WO2023134760A1 (en) * | 2022-01-17 | 2023-07-20 | 世格流体控制（上海）有限公司 | Overcurrent protection apparatus, and explosion-proof solenoid valve on which overcurrent protection apparatus is integrated |
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| CN105704860A (en) * | 2016-03-23 | 2016-06-22 | 成都锐奕信息技术有限公司 | High-reliability LED street lamp device |
| CN106093494A (en) * | 2016-08-22 | 2016-11-09 | 四方继保（武汉）软件有限公司 | A kind of signal for electronic mutual inductor protects filter circuit |
| CN106803748A (en) * | 2016-10-19 | 2017-06-06 | 沈静 | A kind of wave filter suitable for protecting electromagnetic pulse interference |
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| CN105704860A (en) * | 2016-03-23 | 2016-06-22 | 成都锐奕信息技术有限公司 | High-reliability LED street lamp device |
| CN106093494A (en) * | 2016-08-22 | 2016-11-09 | 四方继保（武汉）软件有限公司 | A kind of signal for electronic mutual inductor protects filter circuit |
| CN106803748A (en) * | 2016-10-19 | 2017-06-06 | 沈静 | A kind of wave filter suitable for protecting electromagnetic pulse interference |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112865057A (en) * | 2021-03-19 | 2021-05-28 | 厦门赛尔特电子有限公司 | Electromagnetic protection circuit |
| WO2023134760A1 (en) * | 2022-01-17 | 2023-07-20 | 世格流体控制（上海）有限公司 | Overcurrent protection apparatus, and explosion-proof solenoid valve on which overcurrent protection apparatus is integrated |
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