Battery discharge protection circuit for solar aviation obstruction beacon

Abstract

The utility model provides a battery discharge protection circuit for a solar aviation obstruction beacon, which comprises a common mode inductor, a surge protection circuit, a first filter circuit, a protection switch circuit, an overcurrent protection circuit, a second filter circuit and a lighting load, the protection switch circuit comprises a voltage division circuit and a battery detection integrated chip; the voltage division circuit comprises a tenth resistor, a fourteenth resistor and a seventeenth resistor which are connected in series; a downlink threshold input end pin and an uplink threshold input end pin of the battery detection integrated chip are respectively connected with two nodes among the tenth resistor, the fourteenth resistor and the seventeenth resistor, and a grounding pin is connected with a third pin of the common mode inductor and is grounded; the lithium battery over-discharge protection circuit can carry out over-discharge protection on the lithium battery through the two field effect transistors, ensures the safety of the lithium battery, is simple and reliable, and effectively reduces the cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lighting drive circuit, specifically, relate to a solar energy aviation obstruction light battery discharge protection circuit. BACKGROUND

[0002] Lithium ion battery is a new type of high energy battery with lithium intercalation compound as positive and negative electrode material, has a series of advantages such as high specific energy, high voltage, small self-discharge, good cycle performance and long service life, has begun to be widely used in recent years.

[0003] Lithium battery continues to discharge after discharging to the cut-off voltage, which will damage the battery structure, thereby shortening the service life of the battery. Therefore, when using lithium battery, the cut-off voltage is usually set according to the characteristics of the battery, and the corresponding protection circuit is used to detect whether the battery is discharged to the cut-off voltage, and if the battery is discharged to the cut-off voltage, a signal is sent to close the battery or the battery is directly closed.

[0004] At present, the protection circuit is generally realized by a battery monitoring chip, which has high cost. A kind of existing protection circuit uses the discharge voltage of battery as base electrode input, uses the system voltage applied by battery as collector input, controls the switch of a triode, that is, when the sampled discharge voltage is compared with system voltage and exceeds 0.7V, the triode is turned on, thereby controlling the opening and closing of battery. However, the system voltage fluctuates greatly with discharge, thereby causing the sampled discharge voltage to deviate too much, which often cannot prevent the damage of excessive discharge to battery.

[0005] Therefore, the utility model provides a solar energy aviation obstruction light battery discharge protection circuit. Utility model content

[0006] In view of the problems in the prior art, the utility model aims at providing a solar energy aviation obstruction light battery discharge protection circuit, which overcomes the difficulties of the prior art, can protect lithium battery from over-discharge through two field effect tubes, ensures the safety of lithium battery, and has simple and reliable circuit, effectively reduces the cost.

[0007] The embodiment of the utility model provides a solar energy aviation obstruction light battery discharge protection circuit, which comprises:

[0008] A common mode inductor, which comprises four pins, the first pin is connected with the positive electrode of battery, and the second pin is connected with the negative electrode of battery;

[0009] A surge protection circuit is connected in parallel between the positive electrode of battery and the negative electrode of battery;

[0010] A first filter circuit is connected in parallel between the third pin and the fourth pin of the common mode inductor;

[0011] A protection switch circuit is connected to the output end of the first filter circuit, the protection switch circuit comprises a voltage dividing circuit and a battery detection integrated chip, the voltage dividing circuit comprises a tenth resistor, a fourteenth resistor and a seventeenth resistor connected in series; the lower threshold input end pin of the battery detection integrated chip is connected to the node between the tenth resistor and the fourteenth resistor, the upper threshold input end pin is connected to the node between the fourteenth resistor and the seventeenth resistor, the ground pin is connected to the third pin and grounded, the high effective voltage detection output end is vacant, and the power supply positive input end is connected to the fourth pin of the common mode inductor through a ninth resistor;

[0012] An overcurrent protection circuit is connected to the low effective voltage detection output end of the battery detection integrated chip of the protection switch circuit;

[0013] A second filter circuit is connected to the output end of the overcurrent protection circuit;

[0014] An illumination load is connected to the output end of the second filter circuit.

[0015] Preferably, the surge protection circuit comprises a seventh capacitor, an eighth capacitor and a voltage stabilizing diode connected in parallel with each other, the seventh capacitor is 10 microfarads, the eighth capacitor is 0.1 microfarad.

[0016] Preferably, the first filter circuit comprises a tenth capacitor, a fifth capacitor and an output filter capacitor connected in parallel, the tenth capacitor is 0.1 microfarad, the fifth capacitor is 10 microfarad, and the output filter capacitor is 470 nanofarad.

[0017] Preferably, the ninth resistor in the protection switch circuit is 1000 ohm, the tenth resistor is 51000 ohm, the fourteenth resistor is 12000 ohm, and the seventeenth resistor is 91000 ohm.

[0018] Preferably, the protection switch circuit further comprises a fourth capacitor, one end of the fourth capacitor is connected to the power supply positive input end, and the other end is grounded, and the fourth capacitor is 1 microfarad.

[0019] Preferably, the overcurrent protection circuit comprises:

[0020] An N-type field effect transistor, the gate of the N-type field effect transistor is connected to the low effective voltage detection output end after being connected in series with a sixteenth resistor, the source is grounded, and the drain is connected to the fourth pin after being connected in series with a twelfth resistor, and the twelfth resistor is 100000 ohm;

[0021] A P-type field effect transistor, the gate of the P-type field effect transistor is connected to the drain of the N-type field effect transistor after being connected in series with a thirteenth resistor, the source is connected to the power supply end, and the drain is connected to the fourth pin, and the thirteenth resistor is 1000 ohm.

[0022] Preferably, the over-current protection circuit further comprises:

[0023] a twelfth capacitor, one end of the twelfth capacitor is connected to the power supply end, and the other end is grounded, and the twelfth capacitor is 10 microfarads.

[0024] Preferably, the over-current protection circuit further comprises:

[0025] a magnetic bead inductor, one end of the magnetic bead inductor is connected to the power supply end, and the other end is connected to the input end of the over-current protection circuit.

[0026] Preferably, the over-current protection circuit further comprises:

[0027] an eighteenth resistor, one end of the eighteenth resistor is connected to the gate of the N-type field effect tube, and the other end is grounded, and the eighteenth resistor is 10,000 ohms.

[0028] Preferably, the second filter circuit comprises a ninth capacitor, a thirteenth capacitor and an electrolytic capacitor connected in parallel with each other, the ninth capacitor is 10 microfarads, the thirteenth capacitor is 100 nanofarads, and the electrolytic capacitor is 100 microfarads.

[0029] The solar aviation obstruction light battery discharge protection circuit can protect lithium batteries from over-discharge through two field effect tubes, ensures the safety of the lithium batteries, and has simple and reliable circuit and effectively reduces cost. BRIEF DESCRIPTION OF DRAWINGS

[0030] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments with reference to the attached drawings.

[0031] Figure 1 The circuit diagram of the solar aviation obstruction light battery discharge protection circuit of the utility model. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below with reference to specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure of the present application. The present application can also be implemented or applied to systems in different specific embodiments, and the details in the present application can be modified or changed according to different viewpoints and application systems without departing from the spirit of the present application. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0033] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. The present application can be embodied in various ways, and is not limited to the embodiments described herein.

[0034] In the present application, the expressions "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of the present application. Also, the specific features, structures, materials or characteristics represented can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples represented in the present application and the features of the different embodiments or examples can be combined and integrated by those skilled in the art without contradiction, if necessary.

[0035] In addition, the terms "first", "second" are used only for the purpose of explanation, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0036] In order to clearly explain the present application, devices irrelevant to the explanation are omitted, and the same reference numerals are assigned to the same or similar constituent elements throughout the specification.

[0037] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" in which other elements are interposed therebetween. In addition, when it is said that a device "includes" a certain constituent element, other constituent elements are not excluded unless specifically stated to the contrary, but it means that other constituent elements can also be included.

[0038] When it is said that a device is "on" another device, it can be directly on the other device, but can also be accompanied by other devices therebetween. When it is said that a device is "directly" on another device, there are no other devices therebetween.

[0039] Although the terms first, second, etc. can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including", when used herein, specify the presence of stated features, steps, operations, elements, components, items, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, and / or groups thereof. As used herein, the terms "or" and "and / or" are construed to be inclusive, or mean either one or any combination thereof. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition are only present when the combination of elements, functions, steps, or operations are inherently mutually exclusive.

[0040] The professional terms used herein are only used to refer to specific embodiments, and are not intended to limit the present application. The singular form used herein, unless the statement explicitly indicates the opposite meaning, also includes the plural form. The meaning of "comprising" used in the specification is to specify the particular characteristics, regions, integers, steps, operations, elements and / or components, and is not to exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0041] Although not differently defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Terms defined in commonly used dictionaries are to be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0042] Figure 1 The circuit diagram of the solar aviation obstacle lamp battery discharge protection circuit of the present application is shown in Fig. Figure 1As shown, the solar aviation obstruction light battery discharge protection circuit of the utility model is used for protecting the battery inside the lighting device, comprising: common mode inductor L1, surge protection circuit S1, first filter circuit S2, protection switch circuit S3, overcurrent protection circuit S4, second filter circuit S5 and lighting load LED. Wherein, the common mode inductor L1 includes four pins, the first pin is connected with the positive pole of the battery, and the second pin is connected with the negative pole of the battery. The surge protection circuit S1 is connected in parallel between the positive pole of the battery and the negative pole of the battery. The first filter circuit S2 is connected in parallel between the third pin and the fourth pin of the common mode inductor L1. The output end of the first filter circuit S2 is connected with the protection switch circuit S3, and the protection switch circuit S3 includes a voltage dividing circuit and a battery detection integrated chip. The voltage dividing circuit includes the tenth resistor R10, the fourteenth resistor R14 and the seventeenth resistor R17 connected in series. The node between the tenth resistor R10 and the fourteenth resistor R14 is connected with the down threshold input end pin FTH of the battery detection integrated chip, the node between the fourteenth resistor R14 and the seventeenth resistor R17 is connected with the up threshold input end pin RTH, the grounding pin GND is connected with the third pin and grounded, the high effective voltage detection output end LBO is vacant, and the power supply positive input end VCC is connected with the fourth pin of the common mode inductor L1 through the ninth resistor R9. The low effective voltage detection output end LBO' of the battery detection integrated chip connected with the protection switch circuit S3 is connected with the overcurrent protection circuit S4. The output end of the overcurrent protection circuit S4 is connected with the second filter circuit S5. The output end of the second filter circuit S5 is connected with the lighting load LED. The solar aviation obstruction light battery discharge protection circuit of the utility model protects the lithium battery from overcharging, overdischarging, discharging overcurrent and load short circuit protection through two field effect tubes, ensures the safety of the lithium battery, and the circuit is simple and reliable, effectively reduces the cost.

[0043] In a preferred embodiment, the protection switch circuit S3 is an adjustable hysteresis low-power battery voltage detection chip CN302, which is suitable for voltage detection of single or multiple lithium batteries, multiple alkaline batteries, nickel-cadmium batteries, nickel-hydrogen batteries and multiple lead-acid batteries.

[0044] In a preferred embodiment, the surge protection circuit S1 includes a seventh capacitor C7, an eighth capacitor C8 and a voltage stabilizing diode TV2 connected in parallel, the seventh capacitor C7 is 10 microfarads, the eighth capacitor C8 is 0.1 microfarads, but not limited thereto.

[0045] In a preferred embodiment, the first filter circuit S2 includes a tenth capacitor C10, a fifth capacitor C5 and an output filter capacitor C6 connected in parallel, the tenth capacitor C10 is 0.1 microfarads, the fifth capacitor C5 is 10 microfarads, and the output filter capacitor C6 is 470 nanofarads, but not limited thereto.

[0046] In a preferred embodiment, the ninth resistor R9 in the protection switch circuit S3 is 1000 ohms, the tenth resistor R10 is 51000 ohms, the fourteenth resistor R14 is 12000 ohms, and the seventeenth resistor R17 is 91000 ohms, but not limited thereto.

[0047] In a preferred embodiment, the protection switch circuit S3 further comprises a fourth capacitor C4, one end of the fourth capacitor C4 being connected to the positive input terminal VCC of the power supply, and the other end being grounded, the fourth capacitor C4 being 1 microfarad, but not limited thereto.

[0048] In a preferred embodiment, the overcurrent protection circuit S4 comprises:

[0049] an N-type field effect transistor Q1, the gate of the N-type field effect transistor Q1 being connected to the low active voltage detection output terminal LBO' after being connected in series with a sixteenth resistor R16, the source being grounded, and the drain being connected to the fourth pin after being connected in series with a twelfth resistor R12, the twelfth resistor R12 being 100000 ohms, but not limited thereto.

[0050] a P-type field effect transistor Q2, the gate of the P-type field effect transistor Q2 being connected to the drain of the N-type field effect transistor Q1 after being connected in series with a thirteenth resistor R13, the source being connected to the power supply terminal VDD, and the drain being connected to the fourth pin, the thirteenth resistor R13 being 1000 ohms, but not limited thereto.

[0051] In a preferred embodiment, the overcurrent protection circuit S4 further comprises:

[0052] a twelfth capacitor C12, one end of the twelfth capacitor C12 being connected to the power supply terminal VDD, and the other end being grounded, the twelfth capacitor C12 being 10 microfarad, but not limited thereto.

[0053] In a preferred embodiment, the overcurrent protection circuit S4 further comprises:

[0054] a magnetic bead inductor FB1, one end of the magnetic bead inductor FB1 being connected to the power supply terminal VDD, and the other end being connected to the input terminal of the overcurrent protection circuit S4, but not limited thereto.

[0055] In a preferred embodiment, the overcurrent protection circuit S4 further comprises:

[0056] an eighteenth resistor R18, one end of the eighteenth resistor R18 being connected to the gate of the N-type field effect transistor Q1, and the other end being grounded, the eighteenth resistor R18 being 10000 ohms, but not limited thereto.

[0057] In a preferred embodiment, the second filter circuit S5 comprises a ninth capacitor C9, a thirteenth capacitor C13, and an electrolytic capacitor C11 connected in parallel to each other, the ninth capacitor C9 being 10 microfarad, the thirteenth capacitor C13 being 100 nanofarad, and the electrolytic capacitor C11 being 100 microfarad, but not limited thereto.

[0058] The specific embodiments of the present application are as follows:

[0059] Reference Figure 1As shown, the solar aviation obstruction light battery discharge protection circuit of the utility model is applied to a battery of a solar aviation obstruction light, comprising: common mode inductor L1, surge protection circuit S1, first filter circuit S2, protection switch circuit S3, overcurrent protection circuit S4, second filter circuit S5 and lighting load LED. Among them, the common mode inductor L1 includes four pins, the first pin is connected with the positive pole of the battery, and the second pin is connected with the negative pole of the battery. The surge protection circuit S1 is connected in parallel between the positive pole of the battery and the negative pole of the battery. The first filter circuit S2 is connected in parallel between the third pin and the fourth pin of the common mode inductor L1. The output end of the first filter circuit S2 is connected with the protection switch circuit S3, and the protection switch circuit S3 includes a voltage dividing circuit and a battery detection integrated chip. The voltage dividing circuit includes the tenth resistor R10, the fourteenth resistor R14 and the seventeenth resistor R17 connected in series. The node between the tenth resistor R10 and the fourteenth resistor R14 is connected with the down threshold input end pin FTH of the battery detection integrated chip, the node between the fourteenth resistor R14 and the seventeenth resistor R17 is connected with the up threshold input end pin RTH, the third pin is connected with the ground connection pin GND and grounded, the high effective voltage detection output end LBO is empty, and the power supply positive input end VCC is connected with the fourth pin of the common mode inductor L1 through the ninth resistor R9. The low effective voltage detection output end LBO' of the battery detection integrated chip connected with the protection switch circuit S3 is connected with the overcurrent protection circuit S4. The output end of the overcurrent protection circuit S4 is connected with the second filter circuit S5. The output end of the second filter circuit S5 is connected with the lighting load LED. The surge protection circuit S1 includes the seventh capacitor C7, the eighth capacitor C8 and the voltage stabilizing diode TV2 connected in parallel, the seventh capacitor C7 is 10 microfarad, and the eighth capacitor C8 is 0.1 microfarad. The first filter circuit S2 includes the tenth capacitor C10, the fifth capacitor C5 and the output filter capacitor C6 connected in parallel, the tenth capacitor C10 is 0.1 microfarad, the fifth capacitor C5 is 10 microfarad, and the output filter capacitor C6 is 470 nanofarad. The ninth resistor R9 in the protection switch circuit S3 is 1000 ohm, the tenth resistor R10 is 51000 ohm, the fourteenth resistor R14 is 12000 ohm, and the seventeenth resistor R17 is 91000 ohm. The protection switch circuit S3 further includes the fourth capacitor C4, one end of the fourth capacitor C4 is connected with the power supply positive input end VCC, and the other end is grounded, and the fourth capacitor C4 is 1 microfarad. The overcurrent protection circuit S4 includes: the N-type field effect tube Q1, the gate of the N-type field effect tube Q1 is connected with the low effective voltage detection output end LBO' after being connected with the sixteenth resistor R16 in series, the source is grounded, the drain is connected with the fourth pin after being connected with the twelfth resistor R12 in series, and the twelfth resistor R12 is 100000 ohm. The P-type field effect tube Q2, the gate of the P-type field effect tube Q2 is connected with the drain of the N-type field effect tube Q1 after being connected with the thirteenth resistor R13 in series, the source is connected with the power supply end VDD, and the drain is connected with the fourth pin, and the thirteenth resistor R13 is 1000 ohm.The over-current protection circuit S4 further comprises a twelfth capacitor C12, one end of the twelfth capacitor C12 is connected with the power supply end VDD, the other end is grounded, and the twelfth capacitor C12 is 10 microfarads; a magnetic bead inductor FB1, one end of the magnetic bead inductor FB1 is connected with the power supply end VDD, the other end is connected with the input end of the over-current protection circuit S4; an eighteenth resistor R18, one end of the eighteenth resistor R18 is connected with the gate of the N-type field effect tube Q1, the other end is grounded, and the eighteenth resistor R18 is 10000 ohms. The second filter circuit S5 comprises a ninth capacitor C9, a thirteenth capacitor C13 and an electrolytic capacitor C11 which are connected in parallel, the ninth capacitor C9 is 10 microfarads, the thirteenth capacitor C13 is 100 nanofarads, and the electrolytic capacitor C11 is 100 microfarads.

[0060] The working state of the solar aviation obstruction light battery discharge protection circuit can be the following two kinds:

[0061] The working voltage range of the CN302 is 1.9V to 6V with the 3.6V nickel hydrogen battery as the battery.

[0062] When the battery voltage is lower than the set lower threshold value, the LBO' pin voltage of the CN302 is less than 11V, the LBO' pin output of the CN302 is low (equivalent to outputting a digital signal "0"), the DS end of the Q3 is cut off, at this time, the VDD is 0, and the battery consumption is 0.

[0063] When the battery voltage is greater than the upper threshold value, the LBO' pin voltage of the CN302 is greater than 13V, the LBO' pin output of the CN302 is high (equivalent to outputting a digital signal "1"), the DS end of the Q3 is turned on, at this time, the VDD is VBAT+, and the battery starts to discharge.

[0064] In conclusion, the solar aviation obstruction light battery discharge protection circuit can protect the lithium battery from over-discharge through two field effect tubes, ensure the safety of the lithium battery, and effectively reduce the cost.

[0065] The above is a further detailed description of the utility model in combination with a specific preferred embodiment, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them should be regarded as falling within the protection scope of the utility model.

Claims

1. A solar powered aviation obstruction light battery discharge protection circuit, comprising: The application relates to a battery protection circuit. The battery protection circuit comprises a common-mode inductor (L1) including four pins, a first pin connected to a positive pole of a battery, a second pin connected to a negative pole of the battery, a surge protection circuit (S1) connected in parallel between the positive pole of the battery and the negative pole of the battery, a first filter circuit (S2) connected in parallel between a third pin and a fourth pin of the common-mode inductor (L1), a protection switch circuit (S3) connected to an output end of the first filter circuit (S2), the protection switch circuit (S3) comprising a voltage dividing circuit and a battery detection integrated chip, the voltage dividing circuit comprising a tenth resistor (R10), a fourteenth resistor (R14) and a seventeenth resistor (R17) connected in series, a down threshold input end pin (FTH) of the battery detection integrated chip connected to a node between the tenth resistor (R10) and the fourteenth resistor (R14), an up threshold input end pin (RTH) connected to a node between the fourteenth resistor (R14) and the seventeenth resistor (R17), a ground pin (GND) connected to the third pin and grounded, a high effective voltage detection output end (LBO) left empty, and a power supply positive input end (VCC) connected to the fourth pin of the common-mode inductor (L1) through a ninth resistor (R9), an overcurrent protection circuit (S4) connected to a low effective voltage detection output end (LBO') of the battery detection integrated chip of the protection switch circuit (S3), a second filter circuit (S5) connected to an output end of the overcurrent protection circuit (S4), and a lighting load (LED) connected to an output end of the second filter circuit (S5). The surge protection circuit (S1) comprises a seventh capacitor (C7), an eighth capacitor (C8) and a voltage stabilizing diode (TV2) connected in parallel, the seventh capacitor (C7) is 10 microfarads, the eighth capacitor (C8) is 0.1 microfarad. The first filter circuit (S2) comprises a tenth capacitor (C10), a fifth capacitor (C5) and an output filter capacitor (C6) connected in parallel, the tenth capacitor (C10) is 0.1 microfarad, the fifth capacitor (C5) is 10 microfarad, and the output filter capacitor (C6) is 470 nanofarad. The ninth resistor (R9) in the protection switch circuit (S3) is 1000 ohm, the tenth resistor (R10) is 51000 ohm, the fourteenth resistor (R14) is 12000 ohm, and the seventeenth resistor (R17) is 91000 ohm. The protection switch circuit (S3) further comprises a fourth capacitor (C4) having one end connected to the power supply positive input end (VCC) and the other end grounded, and the fourth capacitor (C4) is 1 microfarad. The overcurrent protection circuit (S4) comprises an N-type field effect transistor (Q1) having a gate connected to the low effective voltage detection output end (LBO') through a sixteenth resistor (R16), a source grounded, and a drain connected to the fourth pin through a twelfth resistor (R12), and the twelfth resistor (R12) is 100000 ohm. ​ 2. The solar aviation obstacle light battery discharge protection circuit of claim 1, wherein, ​ 3. The solar aviation obstacle light battery discharge protection circuit of claim 1, wherein, ​ 4. The solar aviation obstacle light battery discharge protection circuit of claim 1, wherein, ​ 5. The solar aviation obstacle light battery discharge protection circuit of claim 1, wherein, ​ 6. The solar aviation obstacle light battery discharge protection circuit of claim 1, wherein, ​ ​ A P-type field effect transistor (Q2) has its gate connected to the drain of the N-type field effect transistor (Q1) in series with a thirteenth resistor (R13), has its source connected to a power supply terminal (VDD), and has its drain connected to the fourth pin, and the thirteenth resistor (R13) is 1000 ohms.

7. The solar aviation obstacle light battery discharge protection circuit of claim 6, wherein, The overcurrent protection circuit (S4) further comprises: A twelfth capacitor (C12) has one end connected to a power supply terminal (VDD) and the other end grounded, and the twelfth capacitor (C12) is 10 microfarads.

8. The solar aviation obstacle light battery discharge protection circuit of claim 6, wherein, The overcurrent protection circuit (S4) further comprises: A magnetic bead inductor (FB1) has one end connected to a power supply terminal (VDD) and the other end connected to the input terminal of the overcurrent protection circuit (S4).

9. The solar aviation obstacle light battery discharge protection circuit of claim 6, wherein, The overcurrent protection circuit (S4) further comprises: An eighteenth resistor (R18) has one end connected to the gate of the N-type field effect transistor (Q1) and the other end grounded, and the eighteenth resistor (R18) is 10000 ohms.

10. The solar aviation obstacle light battery discharge protection circuit of claim 1, wherein, The second filter circuit (S5) comprises a ninth capacitor (C9), a thirteenth capacitor (C13), and an electrolytic capacitor (C11) connected in parallel with each other, the ninth capacitor (C9) is 10 microfarads, the thirteenth capacitor (C13) is 100 nanofarads, and the electrolytic capacitor (C11) is 100 microfarads.

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