Lightning protection filter circuit and filter connector

Abstract

The utility model relates to a lightning protection filter circuit and a filter connector, comprising a primary protection module comprising a transient voltage suppressor VR1 and a transient voltage suppressor VR2, a filter module comprising a common mode inductor LC6, a capacitor CY1 connected in series between a first pin of the common mode inductor LC6 and a grounding terminal, a capacitor CY3 connected in series between a second pin of the common mode inductor LC6 and the grounding terminal, and a second pin of the common mode inductor LC6 and the grounding terminal. A capacitor CY2 is connected in series between the third pin and the grounding end, a capacitor CY4 is connected in series between the fourth pin and the grounding end, a thermistor RX1 and a capacitor CX1 are respectively connected in parallel between the positive power supply interface PIN + and the negative power supply interface PIN-, and two ends of a capacitor CX3 are respectively connected with a positive power supply outlet PIN + out and a negative power supply outlet PIN + out; and the secondary protection module comprises a transient suppression diode VR3 and a transient suppression diode VR4. The technical problems that in the prior art, the lightning protection effect of a lightning protection connector is limited, and related components cannot be integrated in a lightning protection filter are solved, and the technical effect that the lightning protection effectiveness is guaranteed under the condition that the lightning protection components are integrated in the lightning protection filter is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning protection, and in particular, to a lightning protection filter circuit and a filter connector. Background Art

[0002] In the field of existing airborne 28V power supply lightning protection and filtering technologies, a separate lightning protection connector or a lightning protection filter is generally used to perform lightning protection and filtering on the 28V power supply port. However, a lightning protection connector with lightning protection function generally only has the lightning protection function. Limited by its volume (the lightning protection device is integrated in the connector without changing the original external dimensions), its lightning protection effect is limited. For a 28VDC power supply port, its residual voltage is about 48.4V or above, and it cannot effectively protect the rear-end load.

[0003] The existing filter connectors adopt traditional design methods and structures. Since the components are surface-mounted on the PCB board, their sizes exceed the size of the flange of the filter connector. Therefore, they cannot be installed on the bulkhead from the front panel and can only be installed on the bulkhead in a rear-mounted form, resulting in a larger volume and weight of the filter connector and occupying a larger space inside the cabin, affecting the installation of other equipment and modules inside the cabin, and having poor practicability. Moreover, due to the limited volume inside the cabin, capacitor elements with smaller capacitance values are used, resulting in insufficient filtering ability in a low-frequency environment. Summary of the Utility Model

[0004] By providing a lightning protection filter circuit and a filter connector in an embodiment of the present application, the technical problems in the prior art that the lightning protection effect of the lightning protection connector is limited and the related components cannot be integrated in the lightning protection filter are solved, and the technical effect of ensuring the effectiveness of lightning protection while integrating lightning protection components in the lightning protection filter is achieved.

[0005] In a first aspect, an embodiment of the present application provides a lightning protection filter circuit, including:

[0006] A primary protection module, including a transient voltage suppression diode VR1 and a transient voltage suppression diode VR2. The transient voltage suppression diode VR1 is connected in series between the positive power supply interface PIN+ and the ground terminal, and the transient voltage suppression diode VR2 is connected in series between the negative power supply interface PIN- and the ground terminal;

[0007] The filtering module includes a common-mode inductor LC6. The first pin and the second pin of the common-mode inductor LC6 are respectively connected to the positive power supply interface PIN+ and the positive power supply outlet PIN+out. The third pin and the fourth pin are respectively connected to the negative power supply interface PIN- and the negative power supply outlet PIN+out. A capacitor CY1 is connected in series between the first pin of the common-mode inductor LC6 and the ground terminal. A capacitor CY3 is connected in series between the second pin of the common-mode inductor LC6 and the ground terminal. A capacitor CY2 is connected in series between the third pin of the common-mode inductor LC6 and the ground terminal. A capacitor CY4 is connected in series between the fourth pin of the common-mode inductor LC6 and the ground terminal. A thermistor RX1 and a capacitor CX1 are respectively connected in parallel between the positive power supply interface PIN+ and the negative power supply interface PIN-. Both ends of the capacitor CX3 are respectively connected to the positive power supply outlet PIN+out and the negative power supply outlet PIN+out;

[0008] The secondary protection module includes a transient suppression diode VR3 and a transient suppression diode VR4. The transient suppression diode VR1 is connected in series between the positive power supply interface PIN+ and the ground terminal. The transient suppression diode VR2 is connected in series between the negative power supply interface PIN- and the ground terminal.

[0009] In a second aspect, an embodiment of the present application provides a filtering connector, including a lightning protection and filtering circuit, a circuit board body, and a connector body. The circuit board body is disposed within the connector body, and the lightning protection and filtering circuit is provided on the circuit board body.

[0010] Preferably, the connector body includes: a connector socket; a connector housing through which an output wire is passed; and a fixed substrate, where the connector socket and the connector housing are both fixed on the fixed substrate.

[0011] Preferably, the circuit board body includes: a first printed board on which the primary protection module is provided; a second printed board on which the secondary protection module is provided; a common-mode inductor, where the filtering module is integrated on the common-mode inductor, and both the first printed board and the second printed board are electrically connected to the common-mode inductor.

[0012] Preferably, the connector body and the circuit board body are connected by a conductive adhesive.

[0013] Preferably, the connector housing is made of aluminum alloy.

[0014] Preferably, the output wire is an AF-class high-temperature aviation wire.

[0015] Preferably, the size of the connector socket is 52×26.4×26.4mm.

[0016] Preferably, the aluminum alloy is 5A06 aluminum.

[0017] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0018] 1) Since the primary lightning protection module, the secondary lightning protection module and the filtering module are adopted to discharge, shunt and filter the lightning pulses, the lightning protection and filtering circuit has a relatively stable insertion loss in the range of 10 kHz to 50 MHz while ensuring the effectiveness of lightning protection. It effectively solves the technical problem of insufficient low-frequency filtering ability caused by using a smaller capacitor due to limited space in the prior art, and further realizes the technical effect of meeting the lightning protection and filtering capabilities in a larger range.

[0019] 2) Due to the modular design and the use of positioning posts and conductive adhesives to install and fix each module, the filtering connector integrates a lightning protection and filtering circuit inside while meeting the requirements of small size and light weight. It effectively solves the technical problems of large volume and heavy weight of the traditional connection method, and further realizes the lightning protection and filtering effect while meeting the requirements of small size and light weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The circuit block diagram of a lightning protection and filtering circuit provided by the embodiment of the present application is shown;

[0021] Figure 2 The circuit schematic diagram of a lightning protection and filtering circuit provided by the embodiment of the present application is shown;

[0022] Figure 3 The structural schematic diagram of a filtering connector provided by the embodiment of the present application is shown;

[0023] In the figure, 100, primary protection module; 200, filtering module; 300, secondary protection module;

[0024] 400, first printed circuit board; 500, second printed circuit board; 600, common mode inductor; 700, connector socket; 800, connector housing; 900, fixed substrate; 1000, output wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] By providing a lightning protection and filtering circuit and a filtering connector in the embodiments of the present application, the technical problems of limited lightning protection effect of the lightning protection connector and the inability to integrate related components in the lightning protection filter in the prior art are solved, and the technical effect of ensuring the effectiveness of lightning protection while integrating lightning protection components in the lightning protection filter is realized.

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0027] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present disclosure pertains. The terms "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before this term cover the elements or items listed after this term and their equivalents, without excluding other elements or items. The terms such as "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] Figure 1 The circuit block diagram of a lightning protection and filtering circuit provided by an embodiment of the present application is shown. Figure 2 The circuit schematic diagram of a lightning protection and filtering circuit provided by an embodiment of the present application is shown. As Figure 1 and Figure 2As shown in the figure, the present utility model provides a lightning protection and filtering circuit, including: a primary protection module 100, which includes a transient suppression diode VR1 and a transient suppression diode VR2. The transient suppression diode VR1 is connected in series between the positive power supply interface PIN+ and the ground terminal, and the transient suppression diode VR2 is connected in series between the negative power supply interface PIN- and the ground terminal; a filtering module 200, which includes a common mode inductor 600LC6. The first pin and the second pin of the common mode inductor 600LC6 are respectively connected to the positive power supply interface PIN+ and the positive power supply output PIN+out, the third pin and the fourth pin are respectively connected to the negative power supply interface PIN- and the negative power supply output PIN+out. A capacitor CY1 is connected in series between the first pin of the common mode inductor 600LC6 and the ground terminal, a capacitor CY3 is connected in series between the second pin of the common mode inductor 600LC6 and the ground terminal, a capacitor CY2 is connected in series between the third pin of the common mode inductor 600LC6 and the ground terminal, and a capacitor CY4 is connected in series between the fourth pin of the common mode inductor 600LC6 and the ground terminal. A thermistor RX1 and a capacitor CX1 are respectively connected in parallel between the positive power supply interface PIN+ and the negative power supply interface PIN-. The two ends of the capacitor CX3 are respectively connected to the positive power supply output PIN+out and the negative power supply output PIN+out; a secondary protection module 300, which includes a transient suppression diode VR3 and a transient suppression diode VR4. The transient suppression diode VR1 is connected in series between the positive power supply interface PIN+ and the ground terminal, and the transient suppression diode VR2 is connected in series between the negative power supply interface PIN- and the ground terminal.

[0029] In this embodiment, the primary protection module 100 uses the transient suppression diode VR1 and the transient suppression diode VR2 to discharge the lightning pulse current to the ground. Specifically, the transient suppression diode VR1 and the transient suppression diode VR2 adopt SMCJ30CA with a power of 3000W, a working voltage of 30V, and a pulse current of 31A. Its nominal clamping voltage is 48V or above. After discharge, the residual voltage is greater than 48V.

[0030] The secondary protection module 300 uses the transient suppression diode VR3 and the transient suppression diode VR4 to discharge the lightning pulse current again and control the residual voltage below 40V.

[0031] In the filtering module 200, the capacitor Cx2 and the capacitor Cx3 are X capacitors, and the capacitors Cy1, Cy2, Cy3, and Cy4 are Y capacitors. The X capacitors and the Y capacitors form a π-type filtering circuit. The common mode inductor 600LC6 is wound with a manganese-zinc ferrite magnetic core, which has high magnetic permeability, low magnetic loss, and good temperature characteristics, and its parameters are stable at high frequencies. By using a combination of high and low capacitors, it can take into account the filtering of high and low frequency bands and has a relatively stable insertion loss curve in the range of 10kHz to 50MHz.

[0032] In this application, since the primary lightning protection module, the secondary lightning protection module and the filtering module 200 are adopted to discharge, shunt and filter lightning pulses, the lightning protection and filtering circuit can have relatively stable insertion loss in the range of 10 kHz to 50 MHz while ensuring the effectiveness of lightning protection. This effectively solves the technical problem in the prior art that due to limited space, small capacitors are used, resulting in insufficient low-frequency filtering ability, and further achieves the technical effect of meeting the lightning protection and filtering capabilities in a larger range.

[0033] Figure 3 The structural schematic diagram of a filtering connector provided by an embodiment of the present application is shown. As Figure 3 shown, the present utility model provides a filtering connector, which includes a lightning protection and filtering circuit, a circuit board main body and a connector main body. The circuit board main body is arranged in the connector main body, and the lightning protection and filtering circuit is opened on the circuit board main body.

[0034] In some embodiments, the connector main body includes: a connector socket 700; a connector housing 800 through which an output wire 1000 passes; a fixed substrate 900, and both the connector socket 700 and the connector housing 800 are fixed on the fixed substrate 900.

[0035] In some embodiments, the circuit board main body includes: a first printed board 400 on which the primary protection module 100 is opened; a second printed board 500 on which the secondary protection module 300 is opened; a common-mode inductor 600, and the filtering module 200 is integrated on the common-mode inductor 600. Both the first printed board 400 and the second printed board 500 are electrically connected to the common-mode inductor 600.

[0036] In some embodiments, the connector main body and the circuit board main body are connected by a conductive adhesive.

[0037] In some embodiments, the connector housing 800 is made of aluminum alloy.

[0038] In some embodiments, the output wire 1000 is an AF-class high-temperature aviation wire.

[0039] In some embodiments, the size of the connector socket 700 is 52×26.4×26.4 mm.

[0040] In some embodiments, the aluminum alloy is 5A06 aluminum.

[0041] In this embodiment, the lightning protection and filtering circuit is provided on the main circuit board, and the main circuit board is installed inside the connector body to form a filtering connector, realizing the lightning protection and filtering functions of the airborne power supply. The output wire 1000 is connected to the output end of the lightning protection and filtering circuit. The fixed substrate 900 includes four positioning posts, which are used to lock the connector socket 700 and the main circuit board on the fixed substrate 900, and finally locked on the connector housing 800 as a whole, ensuring the overall stability of the filtering connector. The conductive adhesive is used to connect and fix the connector body and the main circuit board, reducing the overall weight of the filtering connector while ensuring the connection stability. The 5A06 aluminum is used as the connector housing 800, making the filtering connector have high strength and corrosion stability.

[0042] In this application, due to the modular design and the use of positioning posts and conductive adhesives to install and fix each module, the filtering connector meets the requirements of small size and light weight while integrating the lightning protection and filtering circuit inside. It effectively solves the technical problems of large size and heavy weight of the traditional connection method, and further realizes the lightning protection and filtering effect under the condition of meeting the requirements of small size and light weight.

[0043] It should be noted that the components between the embodiments of the present disclosure can be interchanged as long as they can play corresponding roles.

[0044] The following points need to be explained:

[0045] (1) Unless otherwise defined, in the embodiments of the present disclosure and the drawings, the same reference numerals represent the same meaning.

[0046] (2) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures can refer to the general design.

[0047] (3) For clarity, in the drawings used to describe the embodiments of the present disclosure, the components or regions are enlarged. It can be understood that when an element is referred to as being "on" or "under" another element, the element can be "directly" on or under the other element, or there can be intermediate elements.

[0048] The above is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A lightning protection filter circuit, characterized in that: include: The primary protection module comprises a transient suppression diode VR1 and a transient suppression diode VR2, wherein the transient suppression diode VR1 is connected in series between the positive power interface PIN+ and the ground terminal, and the transient suppression diode VR2 is connected in series between the negative power interface PIN- and the ground terminal; A filtering module comprises a common-mode inductor (600) LC6, wherein the first pin and the second pin of the common-mode inductor (600) LC6 are respectively connected to the positive power interface PIN+ and the positive power outlet PIN+out, the third pin and the fourth pin are respectively connected to the negative power interface PIN- and the negative power outlet PIN+out, a capacitor CY1 is connected in series between the first pin of the common-mode inductor (600) LC6 and the ground terminal, a capacitor CY3 is connected in series between the second pin of the common-mode inductor (600) LC6 and the ground terminal, a capacitor CY2 is connected in series between the third pin of the common-mode inductor (600) LC6 and the ground terminal, a capacitor CY4 is connected in series between the fourth pin of the common-mode inductor (600) LC6 and the ground terminal, a thermistor RX1 and a capacitor CX1 are respectively connected in parallel between the positive power interface PIN+ and the negative power interface PIN-, and two ends of the capacitor CX3 are respectively connected to the positive power outlet PIN+out and the negative power outlet PIN+out; The secondary protection module includes a transient suppression diode VR3 and a transient suppression diode VR4. The transient suppression diode VR1 is connected in series between the positive power interface PIN+ and the ground terminal, and the transient suppression diode VR2 is connected in series between the negative power interface PIN- and the ground terminal.

2. A filter connector, characterized in that: It comprises the lightning protection filter circuit as claimed in claim 1, a circuit board body and a connector body, wherein the circuit board body is arranged in the connector body, and the lightning protection filter circuit is opened on the circuit board body.

3. The filter connector according to claim 2, characterized in that: The connector body comprises: Connector socket (700); A connector housing (800), wherein the connector housing (800) is provided with an output wire (1000); A fixed substrate (900), the connector socket (700) and the connector housing (800) are both fixed on the fixed substrate (900).

4. The filter connector according to claim 3, characterized in that: The circuit board body comprises: A first printed circuit board (400), the primary protection module being arranged on the first printed circuit board (400); A second printed circuit board (500), the secondary protection module being arranged on the second printed circuit board (500); A common mode inductor (600), the filter module is integrated on the common mode inductor (600), and the first printed board (400) and the second printed board (500) are both electrically connected to the common mode inductor (600).

5. The filter connector according to claim 4, characterized in that: The connector body and the circuit board body are connected via a conductive adhesive.

6. The filter connector according to any one of claims 3 to 5, characterized in that: The connector housing (800) is made of aluminum alloy.

7. The filter connector according to claim 6, characterized in that: The output wire (1000) is a class AF high-temperature aviation wire.

8. The filter connector according to claim 7, characterized in that: The dimensions of the connector socket (700) are 52×26.4×26.4 mm.

9. The filter connector according to claim 7 or 8, characterized in that: The aluminum alloy is 5A06 aluminum.

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