CN219498956U - Lightning and electromagnetic protection circuit of power supply port of airborne equipment - Google Patents
Lightning and electromagnetic protection circuit of power supply port of airborne equipment Download PDFInfo
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- CN219498956U CN219498956U CN202320209463.3U CN202320209463U CN219498956U CN 219498956 U CN219498956 U CN 219498956U CN 202320209463 U CN202320209463 U CN 202320209463U CN 219498956 U CN219498956 U CN 219498956U
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Abstract
The utility model relates to a lightning and electromagnetic protection circuit of an onboard equipment power port, wherein one ends of three bidirectional transient suppression diodes are respectively connected to three phases of the onboard equipment power port; one end of each of the three capacitors in the first capacitor group is connected to three phases of the power port of the airborne equipment; one end of the three-phase winding of the three-phase common mode inductor is respectively connected to the three phases of the power port of the airborne equipment, and the other end of the three-phase winding of the three-phase common mode inductor is respectively connected with one end of the three-phase winding of the three-phase differential mode inductor; one end of each of the three capacitors in the second capacitor group is connected to the other end of the three-phase winding of the three-phase common-mode inductor; one end of each of the three capacitors in the third capacitor group is connected to the other end of the three-phase winding of the three-phase common-mode inductor. The utility model has higher energy absorption and excellent surge current inhibition capability and good differential/common mode interference inhibition capability, and can realize the protection of lightning and electromagnetic compatibility of the power supply port of the airborne equipment.
Description
Technical Field
The utility model relates to the technical field of lightning and electromagnetic protection, in particular to a lightning and electromagnetic protection circuit of a power port of airborne equipment.
Background
The airborne electronic equipment has the characteristics of high altitude, long air mission time and the like along with the airplane, so that the probability of suffering lightning hazard is greatly increased. Because the onboard electronics are typically installed in the equipment bay, they are less subject to direct lightning strikes, with a high probability of being compromised from inductive lightning. The inductive lightning can induce overvoltage and overcurrent on the power line and the signal line of the airborne electronic equipment, and has strong destructiveness due to extremely short transient time and extremely high energy. The induction electromagnetic pulse generated by the induction lightning can interfere with data communication, affect the performance, service life and even directly damage the equipment. Along with the development of large-scale airliner projects in China, the lightning protection requirements on each airborne device are more and more strict, the national civil aviation general aviation airworthiness requirements are also clearly specified, and aviation related matched products must pass corresponding lightning protection test before delivery. Lightning protection designs have become one of the important parts to be considered in designing on-board electronics.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a lightning and electromagnetic protection circuit of a power port of airborne equipment, which can perform electromagnetic interference and lightning protection on the airborne equipment.
The technical scheme for solving the technical problems is as follows: the lightning and electromagnetic protection circuit comprises a bidirectional transient suppression diode, a first capacitor bank, a second capacitor bank, a third capacitor bank, a three-phase common-mode inductor and a three-phase differential-mode inductor; the two-way transient suppression diodes are arranged in three, one ends of the three two-way transient suppression diodes are respectively and correspondingly connected to the three phases of the power supply port of the airborne equipment, and the other ends of the three two-way transient suppression diodes are connected to the ground of the shell of the airborne equipment; the first capacitor group comprises three capacitors, one ends of the three capacitors in the first capacitor group are respectively and correspondingly connected to three phases of the power supply port of the airborne equipment, and the other ends of the three capacitors in the first capacitor group are connected together; one end of a three-phase winding of the three-phase common mode inductor is correspondingly connected to three phases of the power port of the airborne equipment respectively, the other end of the three-phase winding of the three-phase common mode inductor is correspondingly connected with one end of a three-phase winding of the three-phase differential mode inductor respectively, and the other end of the three-phase winding of the three-phase differential mode inductor is used as an external connection end of the power port of the airborne equipment; the second capacitor group comprises three capacitors, one ends of the three capacitors in the second capacitor group are respectively and correspondingly connected to the other ends of the three-phase windings of the three-phase common-mode inductor, and the other ends of the three capacitors in the second capacitor group are connected with the ground of the casing of the airborne equipment; the third capacitor group comprises three capacitors, one ends of the three capacitors in the third capacitor group are correspondingly connected to the other ends of the three-phase windings of the three-phase common-mode inductor respectively, and the other ends of the three capacitors in the third capacitor group are connected together.
On the basis of the technical scheme, the utility model can be improved as follows.
Further, the lightning and electromagnetic protection circuit further comprises three resistors, and the three resistors are respectively and correspondingly connected in parallel with two ends of the three capacitors in the third capacitor group.
Further, the capacitances in the first capacitance set, the second capacitance set and the third capacitance set are all filter capacitances.
Further, the onboard equipment power port is specifically an AC115V three-phase power port.
Further, parameters of the bidirectional transient suppression diode are determined according to pin injection waveform levels of the power port of the onboard equipment.
The beneficial effects of the utility model are as follows: in the lightning and electromagnetic protection circuit of the power supply port of the airborne equipment, three bidirectional transient suppression diodes can carry out lightning protection on the power supply port of the airborne equipment with three-phase alternating current, the three-phase common-mode inductor and the second capacitor group form a common-mode interference suppression circuit, the three-phase differential-mode inductor, the first capacitor group and the third capacitor group form a differential-mode interference suppression circuit, the three-phase differential-mode inductor, the first capacitor group and the third capacitor group can carry out differential-mode interference suppression on the power supply port of the airborne equipment with three-phase alternating current, and the common-mode interference suppression and the differential-mode interference suppression can well realize electromagnetic protection on the power supply port of the airborne equipment; the utility model has higher energy absorption and excellent surge current inhibition capability and good differential/common mode interference inhibition capability, and can realize the protection of lightning and electromagnetic compatibility of the power supply port of the airborne equipment.
Drawings
FIG. 1 is a schematic diagram of a lightning and electromagnetic protection circuit for a power port of an on-board device according to the present utility model;
fig. 2 is a reference diagram of an on-board equipment power port pin injection waveform.
Detailed Description
The principles and features of the present utility model are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the utility model and are not to be construed as limiting the scope of the utility model.
As shown in fig. 1, a lightning and electromagnetic protection circuit for an on-board equipment power port, which is specifically an AC three-phase power port, such as an AC115V three-phase power port. The lightning and electromagnetic protection circuit comprises a bidirectional transient suppression diode, a first capacitor bank, a second capacitor bank, a third capacitor bank, a three-phase common mode inductor and a three-phase differential mode inductor; the two-way transient suppression diodes are arranged in three, one ends of the three two-way transient suppression diodes are respectively and correspondingly connected to the three phases of the power supply port of the airborne equipment, and the other ends of the three two-way transient suppression diodes are connected to the ground of the shell of the airborne equipment; the first capacitor group comprises three capacitors, one ends of the three capacitors in the first capacitor group are respectively and correspondingly connected to three phases of the power supply port of the airborne equipment, and the other ends of the three capacitors in the first capacitor group are connected together; one end of a three-phase winding of the three-phase common mode inductor is correspondingly connected to three phases of the power port of the airborne equipment respectively, the other end of the three-phase winding of the three-phase common mode inductor is correspondingly connected with one end of a three-phase winding of the three-phase differential mode inductor respectively, and the other end of the three-phase winding of the three-phase differential mode inductor is used as an external connection end of the power port of the airborne equipment; the second capacitor group comprises three capacitors, one ends of the three capacitors in the second capacitor group are respectively and correspondingly connected to the other ends of the three-phase windings of the three-phase common-mode inductor, and the other ends of the three capacitors in the second capacitor group are connected with the ground of the casing of the airborne equipment; the third capacitor group comprises three capacitors, one ends of the three capacitors in the third capacitor group are correspondingly connected to the other ends of the three-phase windings of the three-phase common-mode inductor respectively, and the other ends of the three capacitors in the third capacitor group are connected together.
In fig. 1, TA2 and TA3 represent three bidirectional transient suppression diodes, cx1, cx2 and Cx3 represent three capacitances in the first capacitance group, ly represents a three-phase common-mode inductance, cy1, cy2 and Cy3 represent three capacitances in the second capacitance group, cx4, cx5 and Cx6 represent three capacitances in the third capacitance group, and L1, L2 and L3 represent three phase difference-mode inductances.
Preferably, as shown in fig. 1, the lightning and electromagnetic protection circuit further includes three resistors, where the three resistors are respectively connected in parallel to two ends of three capacitors in the third capacitor group.
In fig. 1, R2, and R3 represent three of the resistances. The purpose of connecting a resistor in parallel with the inductor is to provide a discharge loop for the inductor, preventing high voltage on the inductor from breaking down other devices when the switch in the power supply is turned off.
In this embodiment, the capacitances in the first capacitor set, the second capacitor set, and the third capacitor set are all filter capacitances.
In the utility model, the parameters of the bidirectional transient suppression diode are determined according to the pin injection waveform grade of the power port of the airborne equipment.
The parameters of the bidirectional transient suppression diode are determined as follows:
FIG. 2 is a reference diagram of the power port pin injection waveforms of the on-board device, for a total of 6 waveforms; wherein, (1) is a current waveform 1, (2) is a voltage waveform 2, (3) is a voltage/current waveform 3, (4) is a voltage waveform 4, (5) is a current/voltage waveform 5, and (6) is a current waveform 6. The table of the on-board device power port pin injection waveforms is shown below.
Take AC115V power port pin injection level 3 as an example. Maximum reverse breakdown voltage of selected bidirectional transient suppression diode(V Work of Working voltage of the bidirectional transient suppression diode), the power of the bidirectional transient suppression diode is determined according to calculation, and pin injection is an examination item with damage in a lightning stroke test item, so that the bidirectional transient suppression diode is used for bidirectional detectionThe power calculation of the transient suppression diode refers to the energy waveform of the pin injection to calculate and analyze.
Step 1, calculating the source impedance of the bidirectional transient suppression diode under the condition of the grade 3.
The source impedance Zs in the case of the injection waveform 3 is calculated from the open-circuit voltage Voc and the short-circuit current isc in the above table based on the formula zs=voc/isc.
And 2, calculating the breakdown voltage VBR and the clamping voltage Vc of the bidirectional transient suppression diode. Wherein the breakdown voltage vbr=vrwm/0.85, i.e. the breakdown voltage VBR is 39.5V; during design, the clamping voltage Vc can be selected to be calculated and analyzed at the working voltage smaller than 2 times according to the protection requirement, and the clamping voltage vc=vbr×1.3, that is, the clamping voltage Vc is 51.3V.
And 3, calculating the pulse peak current of the bidirectional transient suppression diode.
The pulse peak current I p of the bi-directional transient suppression diode at the voltage/current waveform 3 signal injection is calculated to be 21.95A according to the formula I p = (Voc-Vc)/Zs.
And 4, calculating pulse power of the bidirectional transient suppression diode corresponding to the pin injection waveform.
When the voltage/current waveform 3 is injected, the pulse power Pp of the bidirectional transient suppression diode is calculated to be 1126W according to the formula pp=vc× I p, and the bidirectional transient suppression diode with appropriate power is selected according to the pulse power.
In the lightning and electromagnetic protection circuit of the power supply port of the airborne equipment, three bidirectional transient suppression diodes can carry out lightning protection on the power supply port of the airborne equipment with three-phase alternating current, the three-phase common-mode inductor and the second capacitor group form a common-mode interference suppression circuit, the three-phase differential-mode inductor, the first capacitor group and the third capacitor group form a differential-mode interference suppression circuit, the three-phase differential-mode inductor, the first capacitor group and the third capacitor group can carry out differential-mode interference suppression on the power supply port of the airborne equipment with three-phase alternating current, and the common-mode interference suppression and the differential-mode interference suppression can well realize electromagnetic protection on the power supply port of the airborne equipment; the utility model can realize the integration of lightning and electromagnetic compatibility protection, meets the indirect lightning requirements of equipment and interconnection wires installed in moderate and weak environments in RTCA/DO-160G airborne equipment environment and test procedures, and the electromagnetic emission and sensitivity requirements of GJB 151B-2013 military equipment and subsystems and the electromagnetic compatibility protection requirements in measurement, has higher energy absorption and excellent surge current inhibition capability and good differential/common mode interference inhibition capability, and has higher guidance and reference values in the aspect of protection design of power ports of the airborne equipment.
The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the utility model are intended to be included within the scope of the utility model.
Claims (5)
1. A lightning and electromagnetic protection circuit of an onboard equipment power port is characterized in that: the lightning and electromagnetic protection circuit comprises a bidirectional transient suppression diode, a first capacitor group, a second capacitor group, a third capacitor group, a three-phase common-mode inductor and a three-phase differential-mode inductor; the two-way transient suppression diodes are arranged in three, one ends of the three two-way transient suppression diodes are respectively and correspondingly connected to the three phases of the power supply port of the airborne equipment, and the other ends of the three two-way transient suppression diodes are connected to the ground of the shell of the airborne equipment; the first capacitor group comprises three capacitors, one ends of the three capacitors in the first capacitor group are respectively and correspondingly connected to three phases of the power supply port of the airborne equipment, and the other ends of the three capacitors in the first capacitor group are connected together; one end of a three-phase winding of the three-phase common mode inductor is correspondingly connected to three phases of the power port of the airborne equipment respectively, the other end of the three-phase winding of the three-phase common mode inductor is correspondingly connected with one end of a three-phase winding of the three-phase differential mode inductor respectively, and the other end of the three-phase winding of the three-phase differential mode inductor is used as an external connection end of the power port of the airborne equipment; the second capacitor group comprises three capacitors, one ends of the three capacitors in the second capacitor group are respectively and correspondingly connected to the other ends of the three-phase windings of the three-phase common-mode inductor, and the other ends of the three capacitors in the second capacitor group are connected with the ground of the casing of the airborne equipment; the third capacitor group comprises three capacitors, one ends of the three capacitors in the third capacitor group are correspondingly connected to the other ends of the three-phase windings of the three-phase common-mode inductor respectively, and the other ends of the three capacitors in the third capacitor group are connected together.
2. The lightning and electromagnetic protection circuit of an on-board equipment power port of claim 1, wherein: the lightning and electromagnetic protection circuit further comprises three resistors, and the three resistors are respectively and correspondingly connected in parallel with two ends of three capacitors in the third capacitor bank.
3. The lightning and electromagnetic protection circuit of an on-board equipment power port according to claim 1 or 2, wherein: the capacitances in the first capacitance set, the second capacitance set and the third capacitance set are all filter capacitances.
4. The lightning and electromagnetic protection circuit of an on-board equipment power port according to claim 1 or 2, wherein: the power port of the airborne equipment is specifically a three-phase power port of AC 115V.
5. The lightning and electromagnetic protection circuit of an on-board equipment power port according to claim 1 or 2, wherein: and the parameters of the bidirectional transient suppression diode are determined according to the pin injection waveform grade of the power port of the airborne equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320209463.3U CN219498956U (en) | 2023-02-14 | 2023-02-14 | Lightning and electromagnetic protection circuit of power supply port of airborne equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320209463.3U CN219498956U (en) | 2023-02-14 | 2023-02-14 | Lightning and electromagnetic protection circuit of power supply port of airborne equipment |
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| Publication Number | Publication Date |
|---|---|
| CN219498956U true CN219498956U (en) | 2023-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320209463.3U Active CN219498956U (en) | 2023-02-14 | 2023-02-14 | Lightning and electromagnetic protection circuit of power supply port of airborne equipment |
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| CN (1) | CN219498956U (en) |
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- 2023-02-14 CN CN202320209463.3U patent/CN219498956U/en active Active
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