Radiation resistant underwater can light

Abstract

The utility model discloses a kind of radiation-tolerant underwater down lamp, belong to down lamp technical field, solve the problem that for the water environment of existing radiation, need to shorten the time of personnel in underwater as far as possible, therefore need underwater down lamp can after angle adjustment action, quickly complete the angle fixing action of problem. Including lamp shell, two hinged cover shells fixedly connected in the back of lamp shell and rotating disc rotationally connected on hinged cover shell, rotating disc is equipped with the positioning hole of several annular array distribution settings on it. The positioning component of the utility model has three working conditions: positioning pin is inserted into through hole and positioning hole to limit rotating disc rotation;Conical head does not limit rotation in through hole;Conical head in positioning hole and through hole feedback rotation angle. Position of positioning pin is adjusted by electromagnet magnetic force, magnetic force is adjusted by PWM and closed-loop feedback control circuit, current is controlled using PWM driving chip IR2104 and MOSFET, realize high-precision adjustment and ensure system safety.

Description

Technical Field

[0001] This utility model relates to the field of downlight technology, and in particular to a radiation-resistant underwater downlight. Background Technology

[0002] Underwater downlights are lighting fixtures specifically designed for underwater environments, widely used in swimming pools, aquariums, fountains, and landscape water features. They utilize LED light sources, offering high efficiency, energy saving, long lifespan, and a wide range of colors. The housing of underwater downlights is typically made of stainless steel or high-strength aluminum alloy, providing excellent waterproof performance with an IP68 protection rating, ensuring long-term stable operation in underwater environments. Their compact design and small size allow for flexible installation options, including surface or recessed mounting, and they can be customized to meet various scenario requirements.

[0003] Currently, underwater downlights generally require the angle to be set in advance. When the underwater downlight is underwater, if the angle needs to be adjusted again, personnel need to go into the water to operate it. However, in the case of aquatic environments with radiation, it is necessary to minimize the time that personnel are underwater. Therefore, the underwater downlight needs to be able to fix the angle as soon as possible after the angle adjustment is performed.

[0004] Therefore, a radiation-resistant underwater downlight is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a radiation-resistant underwater downlight.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A radiation-resistant underwater downlight includes a lamp housing, two hinged covers fixedly connected to the back of the lamp housing, and a rotating disk rotatably connected to the hinged covers. The rotating disk has a plurality of positioning holes arranged in a circular array. The hinged covers have through holes communicating with their interiors. A positioning component is provided inside the hinged covers. The positioning component can move within the hinged covers, the through holes, and the positioning holes.

[0008] Preferably, both hinged covers are open on opposite sides, and a cover plate is detachably connected to the open side of each hinged cover.

[0009] Preferably, the positioning assembly includes a slide cylinder fixedly connected to the inner wall of the hinged cover, an electromagnet fixedly connected to the end of the slide cylinder, a metal spring fixedly connected to the electromagnet and located inside the slide cylinder, and a positioning pin slidably connected inside the slide cylinder. The end of the metal spring away from the electromagnet is fixedly connected to the positioning pin, and the outer ring of the slide cylinder has a through groove communicating with the inside of the hinged cover.

[0010] Preferably, the end of the positioning pin away from the metal spring has a tapered head.

[0011] Preferably, the rotating disk and the hinged cover are rotatably connected by a rotating pin, and a fixing nut is threaded to one end of the rotating pin that extends into the hinged cover.

[0012] Preferably, the rotating disks on both sides are fixedly connected to a connecting frame.

[0013] Preferably, the electromagnet is coupled to a magnetic control circuit, which controls the magnitude of the electromagnet's magnetic force.

[0014] Preferably, the magnetic control circuit includes a controller, a PWM drive circuit, a MOSFET, a sampling resistor, a freewheeling diode, a current feedback circuit, and a differential operational amplifier circuit. The drain of the MOSFET is connected in series with the positive terminal of the power supply, the source of the MOSFET is connected in series with the electromagnet and the sampling resistor, and then connected in series with the negative terminal of the power supply. The gate of the MOSFET is coupled to the output terminal of the PWM drive circuit, and the input terminal of the PWM drive circuit is coupled to the output terminal of the controller.

[0015] Preferably, the connecting frame is fixedly connected to the connecting arm by bolts and nuts.

[0016] This utility model has the following beneficial effects:

[0017] The positioning component of this invention has three operating modes: the positioning pin is inserted into the through hole and the positioning hole restricts the rotation of the turntable; the cone head is in the through hole and does not restrict rotation; the cone head is in both the positioning hole and the through hole and provides feedback on the rotation angle. The position of the positioning pin is adjusted by the magnetic force of an electromagnet. The magnetic force is adjusted through a PWM and closed-loop feedback control circuit. The PWM drive chip IR2104 and MOSFET control the current to achieve high-precision adjustment and ensure system safety. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a partial cross-sectional view of the present invention;

[0021] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0022] Figure 4 This is a structural block diagram of the magnetic control circuit in this utility model.

[0023] 1. Lamp housing; 2. Hinge housing; 3. Cover plate; 4. Rotating pin; 5. Fixing nut; 6. Through hole; 7. Rotating disk; 8. Positioning hole; 9. Connecting bracket; 10. Connecting arm; 11. Bolt and nut; 12. Slide cylinder; 13. Through slot; 14. Electromagnet; 15. Metal spring; 16. Positioning pin; 17. Cone head; 18. MOSFET; 19. Sampling resistor; 20. PWM drive circuit; 21. Controller; 22. Differential operational amplifier circuit; 23. Current feedback circuit; 24. Freewheeling diode. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0029] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] A radiation-resistant underwater downlight, such as Figures 1 to 3 As shown, the device includes a lamp housing 1, two hinged covers 2 fixedly connected to the back of the lamp housing 1, and a rotating disk 7 rotatably connected to the hinged covers 2. The rotating disks 7 on both sides are fixedly connected to a connecting frame 9. The connecting frame 9 is fixedly connected to a connecting arm 10 by bolts and nuts 11. The rotating disk 7 and the hinged covers 2 are rotatably connected by a rotating pin 4. The rotating pin 4 passes through the hinged covers 2 and is threaded with a fixing nut 5 at one end. The rotating disk 7 has a number of positioning holes 8 arranged in a circular array. The hinged covers 2 have through holes 6 communicating with the inside of the rotating disk 7. A positioning component is provided inside the hinged covers 2. The positioning component moves within the hinged covers 2, the through holes 6, and the positioning holes 8. The two hinged covers 2 are both open on the side facing each other. A cover plate 3 is detachably connected to the open side of the hinged covers 2.

[0031] The surfaces of the lamp housing 1, the hinged cover 2, and the cover plate 3 are all coated with polyimide paint, which gives this downlight a certain degree of radiation resistance.

[0032] The positioning assembly includes a slide cylinder 12 fixedly connected to the inner wall of the hinged housing 2, an electromagnet 14 fixedly connected to the end of the slide cylinder 12, a metal spring 15 fixedly connected to the electromagnet 14 and located inside the slide cylinder 12, and a positioning pin 16 slidably connected inside the slide cylinder 12. The end of the metal spring 15 away from the electromagnet 14 is fixedly connected to the positioning pin 16. The outer ring of the slide cylinder 12 is provided with a through groove 13 communicating with the inside of the hinged housing 2. The end of the positioning pin 16 away from the metal spring 15 is provided with a cone head 17.

[0033] The electromagnet 14 is coupled to a magnetic control circuit, which controls the magnitude of the magnetic force of the electromagnet 14. The magnetic control circuit includes a controller 21, a PWM drive circuit 20, a MOSFET, a sampling resistor 19, a freewheeling diode 24, a current feedback circuit 23, and a differential operational amplifier circuit 22. The drain of the MOSFET 18 is connected in series with the positive terminal of the power supply, and the source of the MOSFET 18 is connected in series with the electromagnet 14 and the sampling resistor 19, and then in series with the negative terminal of the power supply. The gate of the MOSFET 18 is coupled to the output terminal of the PWM drive circuit 20, and the input terminal of the PWM drive circuit 20 is coupled to the output terminal of the controller 21.

[0034] The drain of power MOSFET18 is connected to the positive terminal of the power supply. The source is connected to ground via a sampling resistor 19 in series. The gate is connected to the output of the PWM driver chip IR2104 and must be placed close to the driver chip with a gate resistor in series. The input of the PWM driver chip IR2104 is connected to the PWM output of controller 21, and the output is connected to the gate of MOSFET18. A bootstrap capacitor and a bootstrap diode provide high-voltage power. The sampling resistor 19 is connected in series between the source of MOSFET18 and ground, using a Kelvin connection, and is connected to the input of the differential operational amplifier INA180. The operational amplifier output is connected to the ADC pin of controller 21. The freewheeling diode 24 is connected between the drain of MOSFET18 and electromagnet 14, providing a freewheeling path when MOSFET18 is off. Controller 21 controls the driver chip via the PWM output and acquires the operational amplifier output signal via the ADC. Digital ground and analog ground must be connected at a single point. The power supply system includes a main power supply and an auxiliary power supply. The main power supply connects the drain of MOSFET18 and the electromagnet 14 circuit. The auxiliary power supply powers the driver chip and controller 21, and a filter capacitor is added at the power input. The ground plane design requires separating the power ground and signal ground and connecting them via a star ground connection. Reverse connection protection is achieved through a series Schottky diode. Critical signal lines are shielded to suppress EMI. MOSFET18 and sampling resistor 19 require heat sinks. The overall signal flow is as follows: power is supplied through MOSFET18 to drive electromagnet 14; current sampling is fed back to controller 21 via operational amplifier; PWM signal controls the switching of MOSFET18; and freewheeling diode 24 provides freewheeling protection.

[0035] The positioning component in this utility model has three working states. First, the positioning pin 16 in the positioning component is directly inserted into the through hole 6 and the positioning hole 8, so that the turntable cannot rotate relative to the hinged cover 2. Second, the cone head 17 of the positioning pin 16 is located in the through hole 6. At this time, the positioning pin 16 no longer restricts the rotation of the turntable and the hinged cover 2. Third, the cone head 17 of the positioning pin 16 is located in the positioning hole 8 and the through hole 6. At this time, every relative rotation between the turntable and the hinged cover 2 can receive feedback from the positioning pin 16, thereby ensuring that the operator can know how much angle it has rotated.

[0036] The position adjustment of the positioning pin 16 is mainly determined by the strength of the magnetic force of the electromagnet 14. When the magnetic force of the electromagnet 14 is strong, the metal spring 15 will be attracted and contracted, thereby pulling the positioning pin 16 to move.

[0037] In practice, the magnetic force of electromagnet 14 is controlled by a magnetic control circuit. Specifically, this control is achieved by adjusting the magnetic force passing through electromagnet 14. More specifically, this circuit adjusts the current of electromagnet 14 through a combination of pulse width modulation (PWM) and closed-loop feedback. Controller 21 dynamically adjusts the duty cycle of the output PWM signal based on the difference between the preset target current and the real-time sampled current. The PWM driver chip IR2104 controls the on and off time ratio of power MOSFET 18, thereby changing the average voltage across electromagnet 14 to achieve current regulation. Specifically, when the PWM duty cycle increases, the on-time of MOSFET 18 prolongs, the on-time of electromagnet 14 increases, and the current rises accordingly; conversely, when the duty cycle decreases, the current decreases. Figure 4 As shown, the sampling resistor 19 converts the current flowing through the electromagnet 14 into a small voltage signal in real time. After being amplified by the differential operational amplifier, the signal is fed back to the ADC module of the controller 21 to form a closed-loop control. The controller 21 calculates the PWM correction amount and automatically compensates for the current deviation caused by power fluctuations, temperature rise of the electromagnet 14, or load changes. The freewheeling diode 24 provides a freewheeling path for the inductance of the electromagnet 14 during the turn-off period of the MOSFET 18 to suppress voltage spikes. In the end, high-precision and fast-response continuous current regulation is achieved. At the same time, the system safety is ensured through hardware overcurrent protection and software limiting mechanism.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A radiation-resistant underwater downlight, characterized in that, The lamp includes a lamp housing (1), two hinged covers (2) fixedly connected to the back of the lamp housing (1), and a rotating disk (7) rotatably connected to the hinged covers (2). The rotating disk (7) has a number of positioning holes (8) arranged in a circular array. The hinged covers (2) have through holes (6) communicating with its interior. The hinged covers (2) are provided with a positioning component, which moves within the hinged covers (2), through holes (6), and positioning holes (8).

2. The radiation-resistant underwater downlight according to claim 1, characterized in that, Both of the hinged covers (2) are open on one side facing each other, and a cover plate (3) is detachably connected to the open side of the hinged cover (2).

3. The radiation-resistant underwater downlight according to claim 1, characterized in that, The positioning assembly includes a slide cylinder (12) fixedly connected to the inner wall of the hinged cover (2), an electromagnet (14) fixedly connected to the end of the slide cylinder (12), a metal spring (15) fixedly connected to the electromagnet (14) and located inside the slide cylinder (12), and a positioning pin (16) slidably connected inside the slide cylinder (12). The end of the metal spring (15) away from the electromagnet (14) is fixedly connected to the positioning pin (16). The outer ring of the slide cylinder (12) is provided with a through groove (13) communicating with the inside of the hinged cover (2).

4. The radiation-resistant underwater downlight according to claim 3, characterized in that, The locating pin (16) has a cone (17) at the end away from the metal spring (15).

5. The radiation-resistant underwater downlight according to claim 1, characterized in that, The rotating disk (7) is rotatably connected to the hinged cover (2) by a rotating pin (4), and a fixing nut (5) is threaded onto one end of the rotating pin (4) that extends into the hinged cover (2).

6. The radiation-resistant underwater downlight according to claim 1, characterized in that, The rotating disks (7) on both sides are fixedly connected to a connecting frame (9).

7. The radiation-resistant underwater downlight according to claim 3, characterized in that, The electromagnet (14) is coupled to a magnetic control circuit, which controls the magnitude of the magnetic force of the electromagnet (14).

8. The radiation-resistant underwater downlight according to claim 7, characterized in that, The magnetic control circuit includes a controller (21), a PWM drive circuit (20), a MOSFET (18), a sampling resistor (19), a freewheeling diode (24), a current feedback circuit (23), and a differential operational amplifier circuit (22). The drain of the MOSFET (18) is connected in series with the positive terminal of the power supply. The source of the MOSFET (18) is connected in series with the electromagnet (14) and the sampling resistor (19) and then in series with the negative terminal of the power supply. The gate of the MOSFET (18) is coupled to the output terminal of the PWM drive circuit (20). The input terminal of the PWM drive circuit (20) is coupled to the output terminal of the controller (21).

9. A radiation-resistant underwater downlight according to claim 6, characterized in that, The connecting frame (9) is fixedly connected to the connecting arm (10) by bolts and nuts (11).

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