Waterproof lamp internal gas detection control circuit and waterproof lamp

Abstract

The invention relates to the technical field of waterproof lamp detection control, in particular to a waterproof lamp internal gas detection control circuit and a waterproof lamp. The waterproof lamp internal gas detection control circuit comprises a switch power supply, a lamp control mainboard, a lamp driving board, a smoke detection device, a switch element and a relay. The switching power supply is electrically connected with the lamp control mainboard; the smoke detection device is electrically connected with the lamp control mainboard, the lamp control mainboard comprises a switch control end, the switch control end is electrically connected with a control end of a switch element, a first conduction end of the switch element is grounded, and a second conduction end of the switch element is connected with a power supply end through a coil of a relay; the switching power supply is connected with a movable contact of the relay, and a normally open contact of the relay is electrically connected with the lamp driving board. According to the technical scheme, the smoke concentration in the closed cavity of the lamp is monitored in real time, power supply of all circuits of the lamp is automatically cut off when the concentration exceeds the standard, combustion accidents are prevented from being expanded, and the use safety of the waterproof lamp is improved.

Description

Technical Field

[0001] This invention relates to the field of waterproof lighting fixture detection and control technology, and in particular to a waterproof lighting fixture internal gas detection and control circuit and a waterproof lighting fixture. Background Technology

[0002] Waterproof landscape lighting fixtures, with their excellent sealing performance, can effectively isolate external moisture, dust, and other impurities. They are widely used not only in indoor lighting scenarios but also play a vital role in complex environments such as dance halls and outdoor landscapes. However, while the sealing performance brings advantages, it also presents significant safety hazards: when the internal circuitry of the fixture experiences abnormal combustion due to unstable voltage, component aging, or other reasons, or when the light outlet is blocked by foreign objects causing localized overheating and combustion, the tight seal prevents external detection of the internal abnormality and timely power cut-off. This can lead to the fire escalating, potentially damaging the fixture itself, causing fires, property damage, and even personal injury.

[0003] In existing technologies, relying on external manual inspections or general fire protection systems for protection has problems such as delayed response and poor targeting, and cannot meet the real-time safety protection needs of waterproof lighting fixtures in sealed environments. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a waterproof lighting fixture internal gas detection and control circuit and a waterproof lighting fixture, which monitors the smoke concentration inside the sealed cavity of the lighting fixture in real time and automatically cuts off the power supply to all circuits of the lighting fixture when the concentration exceeds the standard, thereby preventing the combustion accident from escalating and improving the safety of the waterproof lighting fixture.

[0005] In a first aspect, the present invention provides a gas detection and control circuit for an internal waterproof lamp, comprising:

[0006] Switching power supplies, lighting control mainboards, lighting driver boards, smoke detection devices, switching components, and relays;

[0007] The switching power supply is electrically connected to the lighting control main board; the smoke detection device is electrically connected to the lighting control main board. The lighting control main board includes a switch control terminal, which is electrically connected to the control terminal of the switch element. The first conducting terminal of the switch element is grounded, and the second conducting terminal of the switch element is connected to the power supply terminal through the coil of a relay.

[0008] The switching power supply is connected to the moving contact of the relay, and the normally open contact of the relay is electrically connected to the lamp driver board; the lamp control main board obtains the smoke concentration signal through the smoke detection device and controls the conduction state of the switching element according to the smoke concentration value.

[0009] When the switching element is in the ON state, the coil is energized, and the moving contact of the relay is connected to the normally open contact; when the switching element is in the OFF state, the coil is de-energized, and the moving contact of the relay is connected to the normally closed contact.

[0010] In some embodiments, the smoke detection device includes a smoke detector MP-2 and a resistor RL;

[0011] The smoke detector MP-2 includes a sensing element VH and a gas-sensitive resistor Rs. The first end of the sensing element VH and the first end of the gas-sensitive resistor Rs are both electrically connected to the lighting control main board. The second end of the sensing element VH is electrically connected to the lighting control main board and the grounding terminal, respectively. The second end of the gas-sensitive resistor Rs is electrically connected to the grounding terminal through the resistor RL. The lighting control main board includes a voltage detection terminal, which is connected in series between the gas-sensitive resistor Rs and the resistor RL.

[0012] In some embodiments, the lighting control mainboard includes a voltage comparison module and a control module electrically connected to the voltage comparison module;

[0013] The voltage comparison module is electrically connected to the voltage detection terminal, and the control module is electrically connected to the switch control terminal.

[0014] In some embodiments, the gas-sensitive resistor is an N-type semiconductor gas-sensitive material, and the resistance value of the gas-sensitive resistor Rs decreases as the smoke concentration increases.

[0015] In some embodiments, the gas-sensitive resistor is a P-type semiconductor gas-sensitive material, and the resistance of the gas-sensitive resistor Rs increases with increasing smoke concentration.

[0016] In some embodiments, the switching element is configured as transistor Q1.

[0017] In some embodiments, the internal gas detection and control circuit of the waterproof lamp further includes:

[0018] Resistors R1 and R2;

[0019] The switch control terminal is connected to the control terminal of the switch element through the resistor R1, and the first end of the resistor R2 is connected in series between the resistor R1 and the control terminal of the switch element; the second end of the resistor R2 is grounded.

[0020] In some embodiments, the internal gas detection and control circuit of the waterproof lamp further includes:

[0021] Diode D6 is connected in parallel with the coil of the relay.

[0022] In a second aspect, the present invention also provides a waterproof lamp, including an internal gas detection and control circuit as described in the first aspect.

[0023] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art:

[0024] 1. Reliable Safety and Protection: The smoke detection device (MP-2 smoke detector + RL resistor) collects the smoke concentration signal inside the lamp in real time, converting the concentration change into a voltage signal. This signal is then quickly processed by the lamp control board, enabling real-time monitoring of abnormal combustion with a fast response speed. When the smoke concentration inside the lamp reaches a preset threshold, the lamp control board automatically disconnects the switching element, de-energizes the relay coil, and cuts off the power supply circuit to the lamp driver board. This prevents the combustion accident from escalating at its source, significantly improving the safety of waterproof lamps and effectively avoiding property damage and personal injury.

[0025] 2. Simple circuit structure and low cost: It adopts conventional electronic components such as transistors, relays, resistors, and diodes, and is combined with the mature MP-2 smoke detector. The overall circuit structure is simple, easy to process and manufacture, and the cost is controllable, making it easy to promote and apply on a large scale.

[0026] 3. Strong adaptability and high stability: By selecting gas-sensitive resistors with N-type or P-type semiconductor gas-sensitive materials, it can be adapted to the needs of different smoke concentration detection ranges. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the internal gas detection and control circuit of a waterproof lamp provided in an embodiment of the present invention;

[0030] Figure 2 This is a structural block diagram of a lighting control motherboard provided in an embodiment of the present invention.

[0031] Among them, 11, switching power supply; 12, lamp driver board; 13, lamp control main board; voltage comparison module 131; control module 132; 14, smoke detection device; 15, switching element; KA, relay; M, coil; COM, moving contact; NO, normally open contact; NC, normally closed contact; K, switch control terminal; V, voltage detection terminal; VCC, power supply terminal. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0033] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0034] The waterproof lighting fixture internal gas detection and control circuit provided in this invention collects real-time smoke concentration signals inside the fixture via a smoke detection device (smoke detector MP-2 + resistor RL), converts concentration changes into voltage signals, and processes them rapidly by the fixture's control board. This enables real-time monitoring of abnormal combustion with a fast response speed. When the smoke concentration inside the fixture reaches a preset threshold, the control board automatically disconnects the switching element, de-energizes the relay coil, and cuts off the power supply circuit to the fixture's driver board. This prevents the combustion accident from escalating at its source, significantly improving the safety of waterproof lighting fixtures and effectively avoiding property damage and personal injury.

[0035] The following description, in conjunction with the accompanying drawings, provides an exemplary description of the internal gas detection and control circuit of the waterproof lamp and the waterproof lamp provided in the embodiments of the present invention.

[0036] Figure 1 This is a schematic diagram of the internal gas detection and control circuit of a waterproof lamp provided in an embodiment of the present invention. Figure 1 As shown, the internal gas detection and control circuit of the waterproof lamp includes: a switching power supply 11, a lamp control main board 13, a lamp driver board 12, a smoke detection device 14, a switching element 15, and a relay KA;

[0037] The switching power supply 11 is electrically connected to the lighting control main board 13; the smoke detection device 14 is electrically connected to the lighting control main board 13. The lighting control main board 13 includes a switch control terminal K, which is electrically connected to the control terminal of the switch element 15. The first conducting terminal of the switch element 15 is grounded, and the second conducting terminal of the switch element 15 is connected to the power supply terminal VCC through the coil M of the relay KA.

[0038] The switching power supply 11 is connected to the moving contact COM of the relay KA, and the normally open contact NO of the relay KA is electrically connected to the lamp driver board 12; the lamp control main board 13 obtains the smoke concentration signal through the smoke detection device 14, and controls the conduction state of the switching element 15 according to the smoke concentration value.

[0039] When the switching element 15 is in the ON state, the coil M is energized, and the moving contact COM of the relay KA is connected to the normally open contact NO; when the switching element 15 is in the OFF state, the coil M is de-energized, and the moving contact COM of the relay KA is connected to the normally closed contact NC.

[0040] Specifically, the switching power supply 11 is electrically connected to the lighting control main board 13, providing a stable operating power supply for the lighting control main board 13; the smoke detection device 14 is electrically connected to the lighting control main board 13, used to collect the smoke concentration signal inside the lighting fixture in real time and transmit it to the lighting control main board 13. The switching power supply 11 is connected to the moving contact COM of the relay KA, and the normally open contact NO of the relay KA is electrically connected to the lighting driver board 12. When the moving contact COM and the normally open contact NO are connected, the switching power supply 11 provides operating power to the lighting driver board 12. The lighting control main board 13 obtains the smoke concentration signal through the smoke detection device 14, and determines whether to trigger the protection mechanism based on the smoke concentration value, thereby controlling the conduction state of the switching element 15.

[0041] Specifically, when the smoke concentration signal does not exceed the threshold, the control switch element 15 of the lighting control main board 13 is in the on state, energizing the coil M of relay KA. Its moving contact COM connects with the normally open contact NO, thereby connecting the power supply circuit of the lighting driver board 12, and the lighting fixture operates normally. When the smoke concentration signal exceeds the threshold, the control switch element 15 of the lighting control main board 13 is in the off state, de-energizing the coil M of relay KA. Its moving contact COM connects with the normally closed contact NC, thereby cutting off the power supply circuit of the lighting driver board 12 and achieving forced power-off. Therefore, by monitoring the smoke concentration inside the sealed cavity of the lighting fixture in real time and automatically cutting off the power supply to all circuits of the lighting fixture when the concentration exceeds the standard, the spread of combustion accidents can be prevented, and the safety of waterproof lighting fixtures can be improved.

[0042] In some embodiments, such as Figure 1 As shown, the smoke detection device 14 includes a smoke detector MP-2 and a resistor RL; the smoke detector MP-2 includes a sensing element VH and a gas-sensitive resistor Rs, the first end of the sensing element VH and the first end of the gas-sensitive resistor Rs are both electrically connected to the lighting control main board 13, and the second end of the sensing element VH is electrically connected to the lighting control main board 13 and the grounding terminal respectively; the second end of the gas-sensitive resistor Rs is electrically connected to the grounding terminal through the resistor RL; the lighting control main board 13 includes a voltage detection terminal V, which is connected in series between the gas-sensitive resistor Rs and the resistor RL.

[0043] Specifically, the smoke detection device 14 may include a smoke detector MP-2 and a series resistor RL; the smoke detector MP-2 contains a sensing element VH and a gas-sensitive resistor Rs. The lighting control main board 13 has a voltage detection terminal V (such as an ADC sampling pin), which is connected to the series node of the gas-sensitive resistor Rs and the resistor RL, and is used to detect the voltage Vrl across the resistor RL. The resistance value of the gas-sensitive resistor Rs can sensitively change with the smoke concentration in the surrounding environment, realizing the conversion between smoke concentration and resistance value, and thus indirectly obtaining smoke concentration information through the voltage Vrl across the resistor RL.

[0044] In some embodiments, Figure 2 This is a structural block diagram of a lighting control mainboard provided in an embodiment of the present invention. (Combined with...) Figure 1 and Figure 2 The lighting control main board 13 includes a voltage comparison module 131 and a control module 132 electrically connected to the voltage comparison module 131; the voltage comparison module 131 is electrically connected to the voltage detection terminal V, and the control module 132 is electrically connected to the switch control terminal K.

[0045] Specifically, the voltage comparison module 131 is electrically connected to the voltage detection terminal V and is used to compare the detected voltage Vrl with the voltage threshold and transmit the comparison result to the control module 132. The control module 132 controls the switching element 15 to be turned on or off according to the output result of the voltage comparison module 131.

[0046] In some embodiments, the gas-sensitive resistor Rs is an N-type semiconductor gas-sensitive material, and the resistance of the gas-sensitive resistor Rs decreases as the smoke concentration increases.

[0047] Specifically, the gas-sensitive resistor Rs can be made of an N-type semiconductor gas-sensitive material (such as tin dioxide SnO2), and its resistance decreases as the smoke concentration increases, thereby causing the voltage Vrl across the resistor RL to increase.

[0048] For example, in conjunction with the preceding text, the voltage comparison module 131 compares the detected voltage Vrl with a preset voltage threshold. When the obtained voltage Vrl is greater than the first voltage threshold, it indicates that the smoke concentration is high. At this time, the power supply to all circuits of the lamp is automatically cut off, which can prevent the combustion accident from escalating and improve the safety of the waterproof lamp.

[0049] The first voltage threshold can be adapted to meet the requirements of the present invention, and the embodiments of the present invention do not specifically limit it.

[0050] In some embodiments, the gas-sensitive resistor is a P-type semiconductor gas-sensitive material, and the resistance of the gas-sensitive resistor Rs increases with the increase of smoke concentration.

[0051] Specifically, the gas-sensitive resistor Rs can be made of a P-type semiconductor gas-sensitive material, and its resistance increases with the increase of smoke concentration, thereby causing the voltage Vrl across the resistor RL to decrease.

[0052] For example, in conjunction with the preceding text, the voltage comparison module 131 compares the detected voltage Vrl with a preset voltage threshold. When the obtained voltage Vrl is less than the second voltage threshold, it indicates that the smoke concentration is high. At this time, the power supply to all circuits of the lamp is automatically cut off, which can prevent the combustion accident from escalating and improve the safety of the waterproof lamp.

[0053] The second voltage threshold can be adapted to meet the requirements of the present invention, and the embodiments of the present invention do not specifically limit it.

[0054] The following example, using an N-type semiconductor gas-sensitive material as the gas-sensitive resistor Rs, illustrates the two states of the lamp:

[0055] Normal operating state: When the switching element 15 is turned on, the coil M of the relay KA is energized and generates electromagnetic attraction, which attracts the moving contact COM of the relay KA to close the normally open contact NO. The switching power supply 11 supplies power to the lamp driver board 12 through the relay KA, and the lamp illuminates normally. At the same time, the smoke detection device 14 works in real time, the resistance value of the gas-sensitive resistor Rs remains stable, and a stable voltage signal is generated across the resistor RL. The voltage detection terminal V of the lamp control main board 13 collects the voltage signal and transmits it to the voltage comparison module 131. The voltage comparison module 131 compares the detected voltage with the preset threshold.

[0056] Abnormal Protection State: When combustion occurs inside the lamp due to circuit fault or obstruction by foreign objects, the generated smoke diffuses to the area around the smoke detector MP-2. The resistance of the gas-sensitive resistor Rs decreases as the smoke concentration increases. Since the gas-sensitive resistor Rs and resistor RL are connected in series for voltage division, the decrease in the resistance of the gas-sensitive resistor Rs causes the voltage across resistor RL to increase, and the voltage signal collected by the voltage detection terminal V increases synchronously. When the smoke concentration reaches the preset danger value, the detection voltage increases to exceed the preset threshold. The voltage comparison module 131 transmits the comparison result to the control module 132. At this time, the control module 132 can determine that abnormal combustion has occurred inside the lamp and outputs a control signal to the switching element 15 to control its disconnection. The coil M of the relay KA is de-energized, the electromagnetic attraction disappears, the moving contact COM is reset under the action of the spring and closes with the normally closed contact NC. The power supply circuit between the switching power supply 11 and the lamp drive board 12 is disconnected, the lamp stops working, and the combustion accident is prevented from spreading.

[0057] In some embodiments, such as Figure 1 As shown, the switching element 15 is configured as transistor Q1.

[0058] Specifically, the switching element 15 can be set as transistor Q1, which has a simple structure, fast response and low cost, and can effectively realize the switching control function.

[0059] In some embodiments, such as Figure 1 As shown, the internal gas detection and control circuit of the waterproof lighting fixture also includes:

[0060] Resistors R1 and R2;

[0061] The switch control terminal K is connected to the control terminal of the switch element 15 through resistor R1. The first end of resistor R2 is connected in series between resistor R1 and the control terminal of switch element 15; the second end of resistor R2 is grounded.

[0062] Specifically, the switch control terminal K is connected to the control terminal of the switching element 15 through resistor R1. Resistor R1 serves as a current limiting protection to prevent excessive current from damaging the switching element 15. The first end of resistor R2 is connected in series between resistor R1 and the control terminal of the switching element 15, and the second end of resistor R2 is grounded. Resistor R2 provides a stable bias voltage to the control terminal of the switching element 15, ensuring the stable operation of the switching element 15.

[0063] In some embodiments, such as Figure 1 As shown, the internal gas detection and control circuit of the waterproof lighting fixture also includes:

[0064] Diode D6 is connected in parallel with the coil M of relay KA.

[0065] Specifically, in order to protect the switching element 15 from breakdown caused by the reverse induced electromotive force generated when the coil M of the relay KA is de-energized, a diode D6 can also be provided. The anode of the diode D6 is connected between the switching element 15 and the coil M of the relay KA, and its cathode is connected to the power supply terminal VCC, that is, it is connected in parallel and in reverse with the coil M of the relay KA (cathode connected to the high potential terminal) to form a freewheeling circuit.

[0066] In summary, for the internal gas detection and control circuit of the waterproof lamp provided by the embodiment of the present invention, after the lamp is connected to the mains power, the switching power supply 11 operates to provide the working power for the lamp control main board 13. After the control main board is powered on and initialized, its control module 132 (such as an MCU) outputs a high-level signal through the switch control terminal K. After this signal passes through the resistor R1, it drives the transistor Q1 to conduct. After the transistor Q1 conducts, one end of the coil M of the relay KA is connected to the power supply terminal VCC (which can be provided by the switching power supply 11 or another power supply), and the other end is grounded through the transistor Q1 to form a loop, and the coil M is powered on. The magnetic force generated by the coil M attracts the moving contact COM of the relay KA to connect it to the normally open contact NO. At this time, the main output power of the switching power supply 11 is delivered to the lamp driving board 12 through the moving contact COM and the normally open contact NO. The lamp driving board 12 operates to light the LED and other light-emitting components of the lamp, and the lamp enters the normal working state.

[0067] Meanwhile, the smoke detection device 14 keeps operating. The sensing element VH inside the smoke detector MP-2 is powered on for preheating to make the gas-sensitive resistor Rs in a sensitive state. The gas-sensitive resistor Rs is connected in series with the resistor RL with a fixed resistance value, and the voltage Vrl at the voltage dividing node (i.e., both ends of RL) is connected to the voltage detection terminal V of the control main board. The resistance value of the gas-sensitive resistor Rs will change with the concentration of specific gases (such as CO, hydrocarbons, etc. in the smoke) in its surrounding environment. Taking N-type materials as an example, when the smoke concentration increases, the resistance value of the gas-sensitive resistor Rs decreases. Since the gas-sensitive resistor Rs is connected in series with the resistor RL and the total voltage (provided by the control main board) remains unchanged, the decrease in the resistance value of the resistor Rs will cause its voltage division to decrease, while the voltage division Vrl of the resistor RL (with a fixed resistance value) will increase accordingly. The voltage comparison module 131 inside the control main board continuously monitors the voltage Vrl, and a voltage threshold V_th corresponding to the safe smoke concentration threshold can be preset in the voltage comparison module 131. When the internal environment of the lamp is normal and the smoke concentration is very low, Vrl < V_th. Once smoke starts to be generated inside the lamp due to abnormal situations (such as circuit short circuit, component overheating, foreign object blocking heat dissipation, etc.), the smoke concentration rises, resulting in an increase in the Vrl voltage. When Vrl rises and exceeds the preset threshold V_th, the control module 132 determines that there is an abnormal combustion risk inside the lamp and immediately outputs a low-level signal through the switch control terminal K. This low-level signal causes the transistor Q1 to change from conducting to cutoff. After the transistor Q1 is cutoff, the current loop of the coil M is cut off, the coil M loses power, and the magnetic force disappears. The moving contact COM of the relay KA resets under the action of the internal spring, thus completely cutting off the power supply path from the switching power supply 11 to the lamp driving board 12, and all the load circuits of the lamp lose power and stop working, avoiding the expansion of the fault and the fire risk.

[0068] Therefore, this invention organically combines smoke detection with power control logic and embeds it into the existing structure of waterproof lighting fixtures, realizing active safety protection for the sealed space inside the lighting fixture. Its structure is simple, cost is controllable, response speed is fast, reliability is high, and it can effectively improve the safety level of waterproof lighting fixtures in various complex application environments.

[0069] Based on the above embodiments, the present invention also provides a waterproof lamp, including the internal gas detection and control circuit of the waterproof lamp as described in the above embodiments, and thus has the same or similar beneficial effects, which will not be repeated here.

[0070] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0071] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A gas detection and control circuit for an internal waterproof lamp, characterized in that, include: Switching power supplies, lighting control mainboards, lighting driver boards, smoke detection devices, switching components, and relays; The switching power supply is electrically connected to the lighting control main board; the smoke detection device is electrically connected to the lighting control main board. The lighting control main board includes a switch control terminal, which is electrically connected to the control terminal of the switch element. The first conducting terminal of the switch element is grounded, and the second conducting terminal of the switch element is connected to the power supply terminal through the coil of a relay. The switching power supply is connected to the moving contact of the relay, and the normally open contact of the relay is electrically connected to the lamp driver board. The lighting control mainboard acquires the smoke concentration signal through the smoke detection device and controls the conduction state of the switching element according to the smoke concentration value; When the switching element is in the ON state, the coil is energized, and the moving contact of the relay is connected to the normally open contact; when the switching element is in the OFF state, the coil is de-energized, and the moving contact of the relay is connected to the normally closed contact.

2. The waterproof lighting fixture internal gas detection and control circuit according to claim 1, characterized in that, The smoke detection device includes a smoke detector MP-2 and a resistor RL; The smoke detector MP-2 includes a sensing element VH and a gas-sensitive resistor Rs. The first end of the sensing element VH and the first end of the gas-sensitive resistor Rs are both electrically connected to the lighting control main board. The second end of the sensing element VH is electrically connected to the lighting control main board and the grounding terminal, respectively. The second end of the gas-sensitive resistor Rs is electrically connected to the grounding terminal through the resistor RL. The lighting control main board includes a voltage detection terminal, which is connected in series between the gas-sensitive resistor Rs and the resistor RL.

3. The waterproof lighting fixture internal gas detection and control circuit according to claim 2, characterized in that, The lighting control main board includes a voltage comparison module and a control module electrically connected to the voltage comparison module; The voltage comparison module is electrically connected to the voltage detection terminal, and the control module is electrically connected to the switch control terminal.

4. The waterproof lighting fixture internal gas detection and control circuit according to claim 3, characterized in that, The gas-sensitive resistor is an N-type semiconductor gas-sensitive material, and the resistance value of the gas-sensitive resistor Rs decreases as the smoke concentration increases.

5. The waterproof lighting fixture internal gas detection and control circuit according to claim 3, characterized in that, The gas-sensitive resistor is a P-type semiconductor gas-sensitive material, and the resistance value of the gas-sensitive resistor Rs increases with the increase of smoke concentration.

6. The waterproof lighting fixture internal gas detection and control circuit according to claim 1, characterized in that, The switching element is set as transistor Q1.

7. The waterproof lighting fixture internal gas detection and control circuit according to claim 1, characterized in that, Also includes: Resistors R1 and R2; The switch control terminal is connected to the control terminal of the switch element through the resistor R1, and the first end of the resistor R2 is connected in series between the resistor R1 and the control terminal of the switch element; the second end of the resistor R2 is grounded.

8. The waterproof lighting fixture internal gas detection and control circuit according to claim 1, characterized in that, Also includes: Diode D6 is connected in parallel with the coil of the relay.

9. A waterproof lamp, characterized in that, Includes the internal gas detection and control circuit for waterproof lighting fixtures as described in any one of claims 1-8.

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