Thin project lamp

Abstract

The utility model discloses a thin project lamp which comprises a shell and a light source aluminum substrate arranged in the shell, a light sensor is arranged on the shell, and a light control circuit and a project lamp light source circuit are arranged on the light source aluminum substrate. The light-operated circuit comprises a power supply circuit, and a light sensing circuit, a switch control circuit and a switch circuit which are connected with the power supply circuit, the switch control circuit comprises an optocoupler switch U1, and the light sensing circuit is respectively connected with the light sensor and the switch control circuit, so that the light sensor controls the transmitting end of the optocoupler switch U1 through the light sensing circuit and the switch control circuit; the switching circuit comprises a switching tube, and the receiving end of the optocoupler switch U1 is connected with the projection lamp light source circuit through the switching tube, so that the optocoupler switch U1 controls the projection lamp light source circuit by controlling the on-off of the switching tube. The light-operated structure is a circuit capable of being integrated on a circuit board, the internal structure of the projection lamp is simplified while full-automatic light control of the projection lamp is guaranteed, and the size and the weight of the projection lamp are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting equipment, in particular to a thin floodlight. Background Art

[0002] A floodlight, also known as a spotlight, is a lighting fixture that produces a significantly higher illuminance on the illuminated surface than the surrounding environment. Usually, it can accurately aim in any direction and has a stable structure that is not restricted by climatic conditions. It is mainly applied to large-area working sites, building contour outlining, stadium lighting, overpass lighting, monument highlighting, parks, flower beds and many other scenarios. Almost all large-area lighting fixtures used outdoors can be regarded as floodlights. The exit beam angles of floodlights vary in width, ranging from 0° to 180°. Among them, those with particularly narrow beams are called searchlights.

[0003] In the prior art, due to the requirements of the installation site and visual effects, floodlights are required to be small in size, easy to install, and have good installation projection effects. At present, when designing floodlights, the design ideas still stay on high strength and fast heat dissipation. The existing designs cannot meet the current requirements. In view of the above requirements, it is necessary to propose a floodlight that is suitable for the site and small in size. Summary of the Utility Model

[0004] In order to overcome the deficiency that the floodlights in the existing technology are relatively large in size, the utility model provides a thin floodlight.

[0005] The technical solution of the utility model is as follows:

[0006] A thin floodlight includes a housing and a light source aluminum substrate disposed in the housing. A light sensor is provided on the housing, and a light control circuit and a floodlight source circuit are provided on the light source aluminum substrate;

[0007] The light control circuit includes a power supply circuit and a light sensing circuit, a switch control circuit, and a switch circuit connected to the power supply circuit:

[0008] The switch control circuit includes an opto-coupler switch U1. The light sensing circuit is respectively connected to the light sensor and the switch control circuit, so that the light sensor controls the emitter of the opto-coupler switch U1 through the light sensing circuit and the switch control circuit;

[0009] The switch circuit includes a switch tube. The receiver of the opto-coupler switch U1 is connected to the floodlight source circuit through the switch tube, so that the opto-coupler switch U1 controls the floodlight source circuit by controlling the on-off of the switch tube.

[0010] Further, in one embodiment, the switching transistor is an MOS transistor Q2. One connecting leg of the emitting end of the opto-coupler switch U1, one end of the second resistor R2, one pin of the optical sensor, the emitter of the fifth transistor Q5, and one end of the fourteenth resistor R14 are respectively connected to the terminal of the first DC voltage; the other connecting leg of the emitting end of the opto-coupler switch U1 is connected to the collector of the first transistor Q1; the other end of the second resistor R2 is respectively connected to the base of the first transistor Q1 and the collector of the third transistor Q3. The base of the third transistor Q3 is respectively connected to the first power capacitor CE1, the collector of the fifth transistor Q5, and one end of the tenth resistor R10. The collector of the fifth transistor Q5 is also connected to one end of the seventeenth resistor R17, and the other end of the seventeenth resistor R17 is connected to the base of the fourth transistor Q4; the other end of the fourteenth resistor R14 is respectively connected to the base of the fifth transistor Q5, the emitter of the fourth transistor Q4, and one end of the second power capacitor CE2; the emitter of the first transistor Q1, the emitter of the third transistor Q3, the other end of the tenth resistor R10, the other end of the first power capacitor CE1, the emitter of the fourth transistor Q4, the other pin of the optical sensor, and the other end of the second power capacitor CE2 are all grounded.

[0011] One connecting leg of the receiving end of the opto-coupler switch U1, the gate of the MOS transistor Q2, and one end of the first resistor R1 are respectively connected and connected to a terminal of the second DC voltage. The other connecting leg of the receiving end of the opto-coupler switch U1, the source of the MOS transistor Q2, and the other end of the first resistor R1 are all respectively connected to another terminal of the second DC voltage and grounded. The drain of the MOS transistor Q2 is connected to the projection light source circuit and is grounded together to control the on / off of the projection light source circuit.

[0012] Further, in one embodiment, it further includes an input lightning protection rectifier filter circuit, a first voltage stabilizing circuit, and a second voltage stabilizing circuit. The input lightning protection rectifier filter circuit is connected to the mains power supply. One end of the high-voltage direct current output of the input lightning protection rectifier filter circuit is connected to the projection light source circuit to supply power to the projection light source circuit; the first voltage stabilizing circuit is connected to the input lightning protection rectifier filter circuit. One end of the constant voltage output of the first voltage stabilizing circuit is connected to the light control circuit to ensure that the input voltage of the light control circuit is the first DC voltage; both ends of the wiring of the second voltage stabilizing circuit are respectively connected to the high-voltage direct current output terminal and the negative output connection terminal of the input lightning protection rectifier filter circuit.

[0013] Further, in one embodiment, the light projection light source circuit includes an LED lighting circuit and an LED lighting control circuit connected to the LED lighting circuit. The LED lighting control circuit is connected to one end of the LED lighting circuit and to the high-voltage direct current output end of the input lightning protection rectification and filtering circuit. The LED lighting control circuit is connected to the other end of the LED lighting circuit and grounded. A plurality of LED control chips are connected in parallel in the LED lighting control circuit. The drain of MOS transistor Q2 is connected to the CS port, CP port, and GND port of each LED control chip and grounded. A fixed-value resistor is also connected to the CP port of each LED control chip, and the other end of the fixed-value resistor is connected to the high-voltage direct current output end of the input lightning protection rectification and filtering circuit.

[0014] Further, in one embodiment, the model of the LED control chip is RM9001DE.

[0015] Further, in one embodiment, a plurality of LED lamp beads are connected to the LED lighting circuit, and the plurality of LED lamp beads are connected in a dot matrix mixed connection structure.

[0016] Further, in one embodiment, in the input lightning protection rectification and filtering circuit, the live wire is connected to one end of the first power resistor RF1, the other end of the first power resistor RF1 is connected to the second power resistor RF2, and the other end of the second power resistor RF2 is respectively connected to one end of the varistor VR1 and any one of the AC connection ends of the two rectifier bridges. The neutral wire is connected to one end of the third power resistor RF3, the other end of the third power resistor RF3 is connected to one end of the fourth power resistor RF4, and the other end of the fourth power resistor RF4 is respectively connected to the other end of the varistor VR1 and the other AC connection end of the two rectifier bridges. The negative output ends of the two rectifier bridges are connected and connected to one side of the first capacitor CB1, and the positive output ends of the two rectifier bridges are connected and connected to the other side of the first capacitor CB1. The positive output ends of the two rectifier bridges are connected to the first capacitor CB1 to output smooth high-voltage direct current to the light projection light source circuit.

[0017] Further, in one embodiment, the models of the first power resistor RF1, the second power resistor RF2, the third power resistor RF3, and the fourth power resistor RF4 are the same.

[0018] Further, in one embodiment, the voltage value of the first direct current voltage is 24V.

[0019] The utility model according to the above solution has the beneficial effect that the designed light control circuit uses a light sensor arranged outside the housing to detect the light intensity of the external environment of the floodlight. By the change of the external light intensity, the voltage at both ends connected to the light sensor is changed. Whether the optocoupler switch U1 is turned on or off is controlled through the light sensing circuit and the switch control circuit. Moreover, the optocoupler switch U1 is also connected to the floodlight light source circuit through a switching tube. When it is evening, the resistance value of the light sensor becomes smaller, the optocoupler switch U1 is not turned on, and then the switching tube is turned on, and the floodlight light source circuit is turned on, and the floodlight lights up; on the contrary, when it is morning, the resistance value of the light sensor becomes smaller, the optocoupler switch U1 is turned on, and then the switching tube is not turned on, and the floodlight light source circuit is not turned on, and the floodlight goes out. The automatic on and off of the floodlight is realized through the full-automatic control of the light control circuit, the structure inside the floodlight housing is simplified, and the volume and weight of the floodlight are reduced. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of a thin floodlight;

[0022] Figure 2 It is a circuit diagram of the present utility model;

[0023] Figure 3 is Figure 2 a partial enlarged view of the circuit diagram in;

[0024] Figure 4 is Figure 2 another partial enlarged view of the circuit diagram in;

[0025] Figure 5 is the floodlight light source circuit;

[0026] Figure 6 is an LED control chip circuit;

[0027] Figure 7 is an LED control chip circuit connected with a capacitor.

[0028] In the figure, 100, the first voltage stabilizing circuit; 200, the input lightning protection rectifying and filtering circuit; 300, the second voltage stabilizing circuit; 400, the light control circuit;

[0029] 510. Housing; 520. Fixed bracket; 530. Reflective sheet; 600. Light source aluminum substrate; 700. Light sensor; 800. Vent valve. Detailed implementation manner

[0030] The present utility model will be further described below in conjunction with the accompanying drawings and the implementation manner. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are only for the purpose of illustration. In the description of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating relative importance or implicitly indicating the quantity of the indicated technical features. Thus, unless otherwise stated, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; the meaning of "plurality" is two or more. The term "comprising" and any deformation thereof means non-exclusive inclusion, and there may be or be added one or more other features, integers, steps, operations, units, components and / or their combinations.

[0031] In addition, unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or the internal communication of two elements. All the technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model are only for the purpose of describing specific embodiments and are not used to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0032] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] Such as Figures 1-6As shown, the present application provides an embodiment of a thin floodlight, which includes a housing 510 and a light source aluminum substrate 600 disposed within the housing 510. A light sensor 700 is provided on the housing 510, and a light control circuit 400 and a floodlight source circuit are provided on the light source aluminum substrate 600. The light control circuit 400 includes a power supply circuit and a light sensing circuit, a switch control circuit, and a switch circuit connected to the power supply circuit. The switch control circuit includes an optocoupler switch U1. The light sensing circuit is respectively connected to the light sensor 700 and the switch control circuit, such that the light sensor 700 controls the emitter of the optocoupler switch U1 through the light sensing circuit and the switch control circuit. The switch circuit includes a switching transistor. The receiver of the optocoupler switch U1 is connected to the floodlight source circuit through the switching transistor, such that the optocoupler switch U1 controls the floodlight source circuit by controlling the on / off of the switching transistor.

[0034] Wherein the switching transistor is a MOS transistor Q2. One connection leg of the emitter of the optocoupler switch U1, one end of the second resistor R2, one pin of the light sensor 700, the emitter of the fifth triode Q5, and one end of the fourteenth resistor R14 are respectively connected to the terminal of the first DC voltage. The other connection leg of the emitter of the optocoupler switch U1 is connected to the collector of the first triode Q1. The other end of the second resistor R2 is respectively connected to the base of the first triode Q1 and the collector of the third triode Q3. The base of the third triode Q3 is respectively connected to the first power capacitor CE1, the collector of the fifth triode Q5, and one end of the tenth resistor R10. The collector of the fifth triode Q5 is also connected to one end of the seventeenth resistor R17. The other end of the seventeenth resistor R17 is connected to the base of the fourth triode Q4. The other end of the fourteenth resistor R14 is respectively connected to the base of the fifth triode Q5, the emitter of the fourth triode Q4, and one end of the second power capacitor CE2. The emitters of the first triode Q1, the third triode Q3, the other end of the tenth resistor R10, the other end of the first power capacitor CE1, the emitter of the fourth triode Q4, the other pin of the light sensor 700, and the other end of the second power capacitor CE2 are all grounded.

[0035] Wherein, a third resistor R3 is connected between the terminal of the first DC voltage and one connection leg of the emitter of the optocoupler switch U1 to protect the optocoupler switch and prevent overcurrent damage. A twelfth resistor R12 is connected between the base of the third triode Q3 and the collector of the fifth triode Q5. One end of the fourteenth resistor R14 is connected to one end of the eighteenth resistor R18. The other end of the eighteenth resistor R18 is respectively connected to the emitter of the fourth triode Q4 and one side of the second power capacitor CE2, realizing the connection of the fourteenth resistor R14 with the emitter of the fourth triode Q4 and the second power capacitor CE2.

[0036] One connection pin of the receiving end of the optocoupler switch U1, the gate of the MOS transistor Q2, and one end of the first resistor R1 are connected and connected to a connection terminal of the second DC voltage. The other connection pin of the receiving end of the optocoupler switch U1, the source of the MOS transistor Q2, and the other end of the first resistor R1 are respectively connected to the other connection terminal of the second DC voltage and grounded. The drain of the MOS transistor Q2 is connected to the light source circuit of the floodlight and is grounded together to control the on / off of the light source circuit of the floodlight.

[0037] Specifically, in the evening and under night light, the resistance value of the light sensor 700 becomes smaller and is less than the resistance value of the seventeenth resistor R17. At this time, the fourth triode Q4 conducts and pulls down the base voltage of the fifth triode Q5. Both the fifth triode Q5 and the third triode Q3 conduct, pulling down the base voltage of the first triode Q1 so that the first triode Q1 does not conduct, and the optocoupler switch U1 connected in series with the first triode Q1 also does not conduct. When the optocoupler switch U1 does not conduct, the MOS transistor Q2 conducts, and the MOS transistor controls the working circuit of the connected floodlight light source circuit to be connected, and the floodlight lights up; on the contrary, in the early morning and under daytime light, the resistance value of the light sensor 700 becomes larger, which ultimately causes the first triode Q1 to conduct, and the optocoupler switch U1 connected in series with the triode Q1 conducts. The second DC current flows through the optocoupler switch U1 and pulls down the gate voltage of the MOS transistor Q2, and the MOS transistor Q2 does not conduct. The MOS transistor controls the working circuit of the connected floodlight light source circuit to be disconnected, and the floodlight is turned off.

[0038] Through the ingenious circuit design in this application, in the light control circuit 400, the light sensor 700 arranged outside the housing 510 is used to detect the light intensity of the external environment of the floodlight. The change in the external light intensity changes the voltage across the two ends connected by the light sensor 700, thereby controlling the conduction or non-conduction of the optocoupler switch U1. When it is evening, the resistance value of the light sensor 700 becomes smaller, and the optocoupler switch U1 does not conduct, and further the MOS transistor Q2 conducts, and the floodlight light source circuit conducts, and the floodlight lights up; on the contrary, when it is morning, the resistance value of the light sensor 700 becomes smaller, the optocoupler switch U1 conducts, and further the MOS transistor Q2 does not conduct, and the floodlight light source circuit does not conduct, and the floodlight is turned off. The full-automatic control of the floodlight turning on and off is realized through the light control circuit 400, simplifying the structure inside the floodlight housing 510 and reducing the volume and weight of the floodlight.

[0039] In one embodiment, it further includes an input lightning protection rectification and filtering circuit 200, a first voltage stabilization circuit 100, and a second voltage stabilization circuit 300. The input lightning protection rectification and filtering circuit 200 is connected to the commercial power. One end of the high-voltage direct current output of the input lightning protection rectification and filtering circuit 200 is connected to the floodlight light source circuit to supply power to the floodlight light source circuit. The first voltage stabilization circuit 100 is connected to the input lightning protection rectification and filtering circuit 200. One end of the constant voltage output of the first voltage stabilization circuit 100 is connected to the light control circuit 400 to ensure that the input voltage of the light control circuit 400 is the first direct current voltage. Generally, the voltage value of the first direct current voltage is 24V. The two ends of the wiring of the second voltage stabilization circuit 300 are respectively connected to the high-voltage direct current output end and the negative output connection end of the input lightning protection rectification and filtering circuit 200. Generally, the voltage value of the second direct current voltage is 12V. The first voltage stabilization circuit 100 stably provides 24V voltage to the photosensitive control circuit to ensure the normal operation of the photosensitive control circuit and play the role of photosensitive control.

[0040] In one embodiment, in the input lightning protection rectification and filtering circuit 200, the live wire is connected to one end of the first power resistor RF1, the other end of the first power resistor RF1 is connected to the second power resistor RF2, and the other end of the second power resistor RF2 is respectively connected to one end of the varistor VR1 and any alternating current connection end of the two rectifier bridges. The neutral wire is connected to one end of the third power resistor RF3, the other end of the third power resistor RF3 is connected to one end of the fourth power resistor RF4, and the other end of the fourth power resistor RF4 is respectively connected to the other end of the varistor VR1 and the other alternating current connection end of the two rectifier bridges. The negative output ends of the two rectifier bridges are connected and connected to one side of the first capacitor CB1, and the positive output ends of the two rectifier bridges are connected and connected to the other side of the first capacitor CB1. The positive output ends of the two rectifier bridges are connected to the first capacitor CB1 to output smooth high-voltage direct current to the floodlight light source circuit. In this embodiment, the first power resistor RF1, the second power resistor RF2, the third power resistor RF3, and the fourth power resistor RF4 have the same model, which is 5.1R / 2W, and the models of the two rectifier bridges are both DB107S. The series connection of two resistors with smaller resistance values can achieve the same effect as that of a larger resistor. At the same time, the component volume of the small resistor helps the thickness of the circuit board and helps reduce the thickness of the floodlight product. The first power resistor RF1, the second power resistor RF2, the third power resistor RF3, and the fourth power resistor RF4 are selected with the same specification of resistors, which is convenient for the welding connection of the components on the product circuit board. At the same time, the series resistors can also enhance the stability of the circuit lightning protection suppression.

[0041] The input lightning protection rectifier filter circuit 200 has a lightning protection and suppression function, which can effectively prevent the problem that the floodlight cannot light up normally due to the voltage fluctuation of the commercial power caused by lightning during thunderstorms. After rectifying and filtering the alternating current, a smooth HVDC high-voltage direct current voltage is obtained to ensure the stable power supply of the floodlight light source circuit and guarantee the power supply safety of the floodlight light source.

[0042] As Figure 5 and Figure 6 shown, in one embodiment, the floodlight light source circuit includes an LED lighting circuit and an LED lighting control circuit connected to the LED lighting circuit. The LED lighting control circuit is connected to one end of the LED lighting circuit and the high-voltage direct current output end of the input lightning protection rectifier filter circuit 200, and the LED lighting control circuit is connected to the other end of the LED lighting circuit and grounded; multiple LED control chips are connected in parallel in the LED lighting control circuit. The drain of MOS transistor Q2 is connected to the CS port, CP port, and GND port of each LED control chip and grounded. A fixed-value resistor is also connected to the CP port of each LED control chip respectively, and the other end of the fixed-value resistor is connected to the high-voltage direct current output end of the input lightning protection rectifier filter circuit 200. The LED control chip is connected to the drain of MOS transistor Q2 in the light control circuit 400, so as to realize the on-off control of the LED control chip by the light control circuit 400, and further realize the automatic switching of the floodlight on and off. The connection positions of the D1 port, D2 port, and D3 port of each LED control chip are the D1, D2, and D3 interface positions of the LED lighting control circuit.

[0043] The model of the LED control chip is RM9001DE. RM9001DE is a three-stage constant current and constant power low-THD LED control chip. It adopts an adaptive LED three-stage segmented driving mechanism, which can flexibly set each LED string to adapt to different voltages, thereby improving the utilization rate of LEDs and the total output lumen number.

[0044] Multiple LED control chips connected in parallel and the peripheral resistors and capacitors in the LED lighting control circuit perform constant current bucking on the high-voltage direct current voltage HVDC to supply power to the LED lamp beads, completing the linear bucking constant current function and keeping the brightness of the floodlight stable. Generally, there are 10 LED control chips, and as Figure 7 shown, a second capacitor CD2 and a third capacitor CD3 are also respectively connected to its D1 port and D2 port. The other sides of the second capacitor CD2 and the third capacitor CD3 are grounded, respectively providing the voltage division of U2, U3, U4, U5, U6, U7, U8, U9, U10, U11, and U12 to complete the linear bucking constant current function.

[0045] As Figure 5As shown, in one embodiment, a plurality of LED lamp beads are connected to the LED lighting circuit, and the plurality of LED lamp beads are connected in a dot matrix hybrid connection structure. The plurality of LED lamp beads can provide light with a relatively high illuminance, meeting the lighting intensity requirements for floodlighting. The dot matrix hybrid connection structure enables any LED lamp bead to form a connection state where series and parallel connections coexist. If an LED lamp bead at any position in the dot matrix is damaged or fails, it does not affect the lighting of other LED lamp beads. When a small number of LED lamp beads fail, the floodlight can still emit light and be used.

[0046] As Figure 1 shown, in terms of structure, the thin-type floodlight includes a housing 510 and a fixed bracket 520 connected to the housing 510. A light source aluminum substrate 600 and a reflector 530 for gathering the light from the light source are provided inside the housing 510. A light sensor 700 and a breather valve 800 are provided outside the housing 510. The light sensor 700 penetrates the housing 510 and is connected to the light source aluminum substrate 600. The above-mentioned input lightning protection rectifier filter circuit 200, first voltage stabilization circuit 100, second voltage stabilization circuit 300, light control circuit 400, and floodlight light source circuit are integrated onto the light source aluminum substrate 600.

[0047] Through the ingenious circuit design of this application, the control of the extinguishing or lighting of the LED lamps in the floodlight is realized by the light control circuit 400 integrated onto the light source aluminum substrate 600. Further, the first DC voltage of the light control circuit 400 is also generated by rectifying and stepping down the voltage of the first voltage stabilization circuit 100 connected to the mains power. The ingenious circuit design enables the power supply for the light source and the power supply for the light source control of the entire floodlight to be integrated onto the light source aluminum substrate 600, improving the structure of the floodlight and making it smaller and thinner.

[0048] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of this utility model.

[0049] The above has made an exemplary description of the utility model patent in conjunction with the accompanying drawings. Obviously, the implementation of the utility model patent is not limited by the above methods. As long as various improvements are made by adopting the method concept and technical solution of the utility model patent, or the concept and technical solution of the utility model patent are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A thin floodlight, comprising a housing and a light source aluminum substrate disposed within the housing, characterized in that, A light sensor is provided on the housing, and a light control circuit and a projection light source circuit are provided on the light source aluminum substrate; The light control circuit includes a power supply circuit and a light sensing circuit, a switch control circuit, and a switch circuit connected to the power supply circuit: The switch control circuit includes an opto-coupler switch U1. The light sensing circuit is respectively connected to the light sensor and the switch control circuit, so that the light sensor controls the emitter of the opto-coupler switch U1 through the light sensing circuit and the switch control circuit; The switch circuit includes a switching tube. The receiving end of the opto-coupler switch U1 is connected to the projection light source circuit through the switching tube, so that the opto-coupler switch U1 controls the projection light source circuit by controlling the on / off of the switching tube.

2. The thin floodlight according to claim 1, wherein, The switching tube is a MOS tube Q2. One connection leg of the emitter of the opto-coupler switch U1, one end of the second resistor R2, one pin of the light sensor, the emitter of the fifth triode Q5, and one end of the fourteenth resistor R14 are respectively connected to the terminal of the first DC voltage; the other connection leg of the emitter of the opto-coupler switch U1 is connected to the collector of the first triode Q1; the other end of the second resistor R2 is respectively connected to the base of the first triode Q1 and the collector of the third triode Q3. The base of the third triode Q3 is respectively connected to the first power capacitor CE1, the collector of the fifth triode Q5, and one end of the tenth resistor R10. The collector of the fifth triode Q5 is also connected to one end of the seventeenth resistor R17. The other end of the seventeenth resistor R17 is connected to the base of the fourth triode Q4; the other end of the fourteenth resistor R14 is respectively connected to the base of the fifth triode Q5, the emitter of the fourth triode Q4, and one end of the second power capacitor CE2; the emitter of the first triode Q1, the emitter of the third triode Q3, the other end of the tenth resistor R10, the other end of the first power capacitor CE1, the emitter of the fourth triode Q4, the other pin of the light sensor, and the other end of the second power capacitor CE2 are all grounded; One connection leg of the receiving end of the opto-coupler switch U1, the gate of the MOS tube Q2, and one end of the first resistor R1 are respectively connected and connected to a terminal of the second DC voltage. The other connection leg of the receiving end of the opto-coupler switch U1, the source of the MOS tube Q2, and the other end of the first resistor R1 are respectively connected to the other terminal of the second DC voltage and grounded. The drain of the MOS tube Q2 is connected to the projection light source circuit and grounded together to control the on / off of the projection light source circuit.

3. The thin floodlight according to claim 2, characterized in that, It also includes an input lightning protection rectifier filter circuit, a first voltage stabilizing circuit, and a second voltage stabilizing circuit. The input lightning protection rectifier filter circuit is connected to the mains power supply. One end of the high-voltage DC output of the input lightning protection rectifier filter circuit is connected to the projection light source circuit to supply power to the projection light source circuit; the first voltage stabilizing circuit is connected to the input lightning protection rectifier filter circuit. One end of the constant voltage output of the first voltage stabilizing circuit is connected to the light control circuit to ensure that the input voltage of the light control circuit is the first DC voltage; both ends of the connection of the second voltage stabilizing circuit are respectively connected to the high-voltage DC output terminal and the negative output connection terminal of the input lightning protection rectifier filter circuit.

4. The thin floodlight according to claim 3, characterized in that, The light source circuit of the projection lamp includes an LED lighting circuit and an LED lighting control circuit connected to the LED lighting circuit. The LED lighting control circuit is connected to one end of the LED lighting circuit and to the high-voltage direct current output end of the input lightning protection rectification and filtering circuit. The LED lighting control circuit is connected to the other end of the LED lighting circuit and grounded. A plurality of LED control chips are connected in parallel in the LED lighting control circuit. The drain of MOS transistor Q2 is connected to the CS port, CP port, and GND port of each LED control chip and grounded. A fixed-value resistor is also connected to the CP port of each LED control chip, and the other end of the fixed-value resistor is connected to the high-voltage direct current output end of the input lightning protection rectification and filtering circuit.

5. The thin floodlight according to claim 4, wherein The model of the LED control chip is RM9001DE.

6. The thin floodlight according to claim 5, characterized in that, A plurality of LED lamp beads are connected to the LED lighting circuit, and the plurality of LED lamp beads are connected in a dot matrix hybrid connection structure.

7. The thin floodlight according to claim 2, wherein In the input lightning protection rectification and filtering circuit, the live wire is connected to one end of the first power resistor RF1, the other end of the first power resistor RF1 is connected to the second power resistor RF2, and the other end of the second power resistor RF2 is respectively connected to one end of the varistor VR1 and any alternating current connection end of the two rectifier bridges. The neutral wire is connected to one end of the third power resistor RF3, the other end of the third power resistor RF3 is connected to one end of the fourth power resistor RF4, and the other end of the fourth power resistor RF4 is respectively connected to the other end of the varistor VR1 and the other alternating current connection end of the two rectifier bridges. The negative output ends of the two rectifier bridges are connected and connected to one side of the first capacitor CB1, and the positive output ends of the two rectifier bridges are connected and connected to the other side of the first capacitor CB1. The positive output ends of the two rectifier bridges are connected to the first capacitor CB1 to output smooth high-voltage direct current to the light source circuit of the projection lamp.

8. The thin floodlight according to claim 7, characterized in that, The models of the first power resistor RF1, the second power resistor RF2, the third power resistor RF3, and the fourth power resistor RF4 are the same.

9. The thin floodlight according to claim 2, wherein The voltage value of the first direct current voltage is 24V.

10. The thin floodlight according to claim 9, characterized in that, The voltage value of the second direct current voltage is 12V.

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