Panel lamp circuit with sterilization and human presence sensing functions

Abstract

The utility model discloses a panel light circuit with sterilization and human presence sensing function, aims at solving the single function of existing panel light, the insufficient safety of UV sterilization. It includes double mode detection control unit, double load execution unit and power supply unit: double mode detection control unit is composed of 24G millimeter wave radar module and bluetooth control module, and the human presence state is accurately judged through data interaction, and double load execution unit contains lighting load module and UV sterilization load module, and power supply unit is output through three -level circuit, and adapts each module power supply demand. The utility model realizes the intelligent cooperation of the light of human coming and the sterilization of human walking, has the advantages of UV sterilization safety protection, lighting flexible regulation and power supply stability, and is suitable for indoor scene such as family, office.

Description

Technical Field

[0001] This utility model relates to the field of lighting equipment technology, specifically to a panel light circuit with sterilization and human presence sensing functions. Background Technology

[0002] With increasing demands for comfort and health in indoor environments, panel lights have become a mainstream indoor lighting device. Currently, most human presence sensor panel lights on the market only offer lighting control functions based on human detection, such as using infrared or simple radar sensors to detect human presence and turn off when someone leaves. While this meets basic energy-saving and convenient lighting needs, it has significant functional limitations: Enclosed indoor spaces (such as bathrooms, kitchens, and bedrooms) are prone to bacterial and mold growth, and the metabolism of microorganisms produces musty and rotten odors, affecting indoor air quality and human health. Existing panel lights only provide illumination and cannot address these issues. Additional equipment such as ultraviolet germicidal lamps is required, which not only increases space usage but also necessitates separate wiring and control, resulting in poor usability.

[0003] In some scenarios, users may use their own ultraviolet (UV) sterilization devices. However, traditional sterilization devices are mostly manually or timed, lacking linkage with human presence detection. UV radiation is highly damaging to the eyes and skin; if accidentally activated while a person is present, it can easily cause burns, vision damage, and other safety accidents. On the other hand, relying solely on timed control may pose safety hazards if a person temporarily enters the room without being promptly turned off.

[0004] Therefore, overcoming the aforementioned shortcomings has become an important issue that urgently needs to be addressed by those skilled in the art. Utility Model Content

[0005] This utility model overcomes the shortcomings of the above-mentioned technologies and provides a panel light circuit with sterilization and human presence sensing functions. It addresses the problems of existing panel lights only having a single lighting function, requiring manual or timed control of the UV sterilization module, and lacking intelligent linkage with human presence status. This achieves intelligent coordination and safe, reliable operation of lighting and sterilization. To achieve the above objectives, this utility model adopts the following technical solution: A panel light circuit with sterilization and human presence sensing functions includes: Dual-mode detection and control unit 1: includes a radar detection module 11 and a Bluetooth control module 12; the radar detection module 11 and the Bluetooth control module 12 are interconnected to determine whether there is a person or no one through data exchange; the Bluetooth control module 12 is also provided with at least two drive control output ports; Dual-drive execution unit 2: includes a lighting drive module 21 and a UV sterilization drive module 22, which are respectively connected to one of the drive control output ports of the Bluetooth control module 12; Power supply unit 3: used to convert the external input voltage into at least two different DC voltage specifications to power each module of each unit; The at least two drive control output ports include: a first drive control output port T11 connected to the lighting drive module 21 and used to control the lighting drive module 21 to start when a human body is detected / used to turn off or operate at low power when a human body is detected to leave; and a second drive control output port T12 connected to the UV sterilization drive module 22 and used to control the UV sterilization drive module 22 to start when a human body is detected to leave.

[0006] Preferably, the radar detection module 11 is a 24G millimeter-wave radar module; the radar detection module 11 is provided with a first transmitting port T111 and a first receiving port T112 that are interactively connected to the Bluetooth control module 12, and a power supply input terminal that is connected to the power supply unit 3.

[0007] Preferably, the Bluetooth control module 12 is provided with a second receiving port T121, a second transmitting port T122, a first drive control output port T11, and a second drive control output port T12, which are interactively connected to the radar detection module 11 to realize bidirectional data interaction. The first drive control output port T11 is provided with at least one PWM control signal output terminal.

[0008] Preferably, the power supply unit 3 includes a rectifier filter circuit 31, a DC-DC converter circuit 32, and a low-dropout linear regulator circuit 33 connected in sequence; the output terminal of the rectifier filter circuit 31 serves as the first power supply output terminal, the output terminal of the DC-DC converter circuit 32 serves as the second power supply output terminal, and the output terminal of the low-dropout linear regulator circuit 33 serves as the third power supply output terminal.

[0009] Preferably, the rectifier and filter circuit 31 includes an input protection sub-circuit 311, a common-mode inductor sub-circuit 312, an EMI and rectifier sub-circuit 313, and a filter sub-circuit 314 connected in sequence. Input protection sub-circuit 311 includes a varistor RV1 connected in parallel between the external AC neutral line N and the live line L, and a fuse resistor FR connected in series in the input path of the live line L; The common-mode inductor sub-circuit 312 is a common-mode inductor, which has a first coil and a second coil; The EMI and rectifier circuit 313 includes at least a rectifier bridge BD1, wherein the AC input terminal of the rectifier bridge BD1 is connected to the common mode inductor L1 and the output terminal serves as the first power supply output terminal; The filter sub-circuit 314 includes a first polarity capacitor EC1 with its positive terminal connected to the output terminal of rectifier bridge BD1 and its negative terminal grounded, and a first diode D5 with its anode connected to the output terminal of rectifier bridge BD1 and its cathode grounded through a second polarity capacitor EC2 connected in the forward direction.

[0010] Preferably, the DC-DC conversion circuit 32 includes: a power management chip U2, a linear regulator U3, and peripheral components; the power management chip U2 is used to perform preliminary conversion or conditioning of the input voltage; the linear regulator U3 is connected to the output terminal of the power management chip U2, and is used to further regulate the voltage after it has been processed by the power management chip U2, and its output terminal is used as a second power supply output terminal; The low-dropout linear regulator circuit 33 is an LDO regulator circuit, including an LDO regulator chip U4 and its peripheral components; the LDO regulator chip U4 is connected to the second power supply output terminal, and its output terminal serves as the third power supply output terminal.

[0011] Preferably, the lighting driving module 21 includes: at least one lighting driving circuit; Each of the lighting drive circuits is provided with a high-voltage input terminal connected to the first power supply output terminal, a control input terminal connected to the first drive control output port T11 of the Bluetooth control module 12, and a lighting output terminal for connecting to an external lighting drive. Each of the lighting drive circuits includes an LED constant current driver chip of model BP2956DS and its peripheral circuitry.

[0012] Preferably, the lighting driving device connected to the lighting driving module 21 is a dual-color LED lamp capable of emitting white or yellow light; the lighting driving module 21 includes two lighting driving circuits, namely a first lighting driving circuit 211 for driving the white LED light strip of the dual-color LED lamp and a second lighting driving circuit 212 for driving the yellow LED light strip of the dual-color LED lamp.

[0013] Preferably, the UV sterilization drive module 22 includes: an enable control circuit 221 and a transistor cascade drive circuit 222 connected to the enable control circuit 221; The enable control circuit 221 is connected to the Bluetooth control module 12 and is used to receive the signal from the second drive control output port T12 to control the switching on and off of the transistors in the transistor cascade drive circuit 222.

[0014] Preferably, the enable control circuit 221 includes a first NPN transistor Q3, an eleventh resistor R26, a twelfth resistor R27, an eleventh diode D9, and a relay 2211. The base of the first NPN transistor Q3 is connected to the second drive control output port T12 through the eleventh resistor R26, the emitter is grounded, and the collector is connected to one end of the relay 2211 coil. The other end of the relay coil is connected to the second power supply output terminal. The eleventh diode D9 is forward-biased and connected between one end and the other end of the relay coil. The twelfth resistor R27 is connected between the cathode of the eleventh diode D9 and the second drive control output port T12. The common terminal of the relay 2211 is connected to an external high-voltage input terminal, and the normally open contact is used as a high-voltage output terminal to connect to an external UV lamp. The cascaded transistor drive circuit 222 includes: eleventh transistor Q1, twelfth transistor Q2, ninth capacitor C9, tenth capacitor C10, sixth inductor L6, seventh inductor L7, eighth inductor L8, ninth inductor L9, nineteenth resistor (R19), twentieth resistor R20, twenty-first resistor R21, twenty-second resistor R22, twenty-third resistor R23, twenty-fourth resistor R24, nineteenth diode D19, tenth diode D10, ninth polarity capacitor EC9, tenth polarity capacitor EC10, and UV lamp device 220; The collector of transistor Q1 is connected to an external high-voltage input terminal, the base is connected to one end of inductor L8 through resistor R24, and the emitter is connected to one end of resistor R19 through resistor R22. The other end of inductor L8 is connected to one end of resistor R19. The other end of resistor R19 is connected to the collector of transistor Q2. Diode D19 is connected in reverse between the base and emitter of transistor Q1. The external high-voltage input terminal is positively connected to the ground via the ninth polarity capacitor EC9; the positive terminal of the ninth polarity capacitor EC9 is connected to the other end of the eighth inductor L8 via the ninth capacitor C9. The emitter of the 12-stage transistor Q2 is grounded through the 23rd resistor R23, the positive terminal of the 10th polarity capacitor EC10 is grounded, and the negative terminal is connected to the base of the 12-stage transistor Q2 in sequence through the 6th inductor L6 and the 21st resistor R21; the 10th diode D10 is forward connected between the emitter and base of the 12-stage transistor Q2. One end of the nineteenth resistor R19 and the base of the twelfth transistor Q2 are both connected to one end of the ninth inductor L9 through the twentieth resistor R20. The other end of the ninth inductor L9 is connected to one end of the UV lamp device 220 through the seventh inductor L7. The external high voltage input terminal is connected to the other end of the UV lamp device 220 through the tenth capacitor C10.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This case utilizes dual-mode detection of a 24G millimeter-wave radar module 11 and a Bluetooth control module 12 to accurately determine the presence of a human body. When a human body is detected, the Bluetooth control module 12 immediately cuts off the power supply to the relay 2211 in the enable control circuit 221 through the second drive control output port T12. The normally open contact of the relay opens, directly blocking the energy transmission from the external high-voltage input terminal to the UV lamp, thus preventing the UV lamp from being accidentally started at the power source. Only when the relay closes in the unoccupied state is the transistor cascade drive circuit 222 allowed to start UV sterilization, completely avoiding the risk of human exposure to ultraviolet rays. This achieves dual safety control linked to human body, solving the safety pain point of accidental start-up in traditional sterilization equipment.

[0016] 2. The lighting driver module 21 in this case adopts two independent driver circuits to drive white and yellow LED light strips respectively, allowing users to switch color temperatures according to scene requirements. Simultaneously, the PWM control signal of the first driver control output port T11 enables stepless adjustment of the LED light strip brightness, adapting to different lighting needs. Compared to traditional single-color fixed-brightness panel lights, this improves the flexibility and comfort of use. The transistor cascaded driver circuit 222 of the UV sterilization driver module, through the cascaded design of Q1 and Q2, combined with the signal conditioning of the eighth inductor L8 and the ninth capacitor C9, can stably output the high-frequency high voltage required for UV lamp ignition, avoiding ignition difficulties caused by insufficient voltage withstand when driving a single transistor. The ninth polarity capacitor EC9 filters out high-voltage input ripple, and the tenth capacitor C10 optimizes the voltage waveform across the UV lamp, ensuring a stable UV intensity output and guaranteeing the killing effect on bacteria and mold in enclosed spaces. Simultaneously, by inactivating microorganisms, it indirectly eliminates musty and rotten odors, overcoming the limitation of existing panel lights that only provide illumination without health functions.

[0017] 3. The power supply unit 3 in this case, through the design of its rectifier and filter circuit 31, DC-DC conversion circuit 32, and low-dropout linear voltage regulator circuit 33, outputs three adaptable voltages: the first power supply output provides high voltage input to the lighting driver circuit to meet the constant current driving requirements of the LED; the second power supply output provides stable medium voltage to the relay coil and transistor cascaded drive circuit; and the third power supply output provides low ripple 3.3V / 5V voltage to the 24G radar module and Bluetooth control module, avoiding power supply failures caused by voltage mismatch between different modules and solving the problem of poor adaptability of traditional panel lights with a single power supply. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this case.

[0019] Figure 2 This is the circuit diagram of the radar detection module in this case.

[0020] Figure 3This is the circuit diagram of the Bluetooth control module in this case.

[0021] Figure 4 This is the circuit diagram of the power supply unit in this case.

[0022] Figure 5 This is the circuit diagram of the lighting driver module in this case.

[0023] Figure 6 This is the circuit diagram of the UV sterilization drive module in this case. Detailed Implementation

[0024] The following examples provide a more detailed description of the features and other related characteristics of this utility model, to facilitate understanding by those skilled in the art: like Figures 1 to 6 As shown, this utility model provides a panel light circuit with sterilization and human presence sensing functions, including: Dual-mode detection and control unit 1: includes a radar detection module 11 and a Bluetooth control module 12; the radar detection module 11 and the Bluetooth control module 12 are interconnected to determine whether there is a person or no one through data exchange; the Bluetooth control module 12 is also provided with at least two drive control output ports; Dual-drive execution unit 2: includes a lighting drive module 21 and a UV sterilization drive module 22, which are respectively connected to one of the drive control output ports of the Bluetooth control module 12; The power supply unit 3 is used to convert the external input voltage into at least two different DC voltages to power each module of each unit. The at least two drive control output ports include: a first drive control output port T11 connected to the lighting drive module 21 and used to control the lighting drive module 21 to start when a human body is detected / used to turn off or operate at low power when a human body is detected to leave; and a second drive control output port T12 connected to the UV sterilization drive module 22 and used to control the UV sterilization drive module to start with a delay when a human body is detected to leave.

[0025] Through the coordinated operation of the various units mentioned above, this system promptly activates the lighting driver module upon detecting the presence of a human body to meet lighting needs; when the human body leaves, the lighting driver module is either turned off or operates at low power to achieve energy savings. Simultaneously, the UV sterilization driver module is delayed in starting after the human body leaves, ensuring personnel safety while effectively utilizing sterilization time to enhance the sterilization effect.

[0026] As described above, this case utilizes a dual-mode detection control unit composed of a radar detection module and a Bluetooth control module. On one hand, the radar detection module focuses on high-precision human presence detection, unaffected by environmental interference and capable of recognizing static human bodies; on the other hand, the Bluetooth control module independently handles drive control and communication, thereby improving detection accuracy, system coordination efficiency, and functional expandability. A dual-drive execution unit 2 is formed by a lighting drive module 21 and a UV sterilization drive module 22. These two modules work together, providing lighting for daily use and activating sterilization when no one is present. Their clear division of labor and efficient dual-drive coordination enrich the panel light's functionality and better adapt to different scenarios. Furthermore, the coordinated setup of the dual-mode detection control unit and the lighting drive module intelligently adjusts the working state based on the presence of a human body, reducing energy consumption. The coordinated setup of the dual-mode detection control unit and the UV sterilization drive module also avoids direct contact between the human body and ultraviolet light, ensuring personnel safety. In addition, the power supply unit can convert the external input voltage into at least two different DC voltage specifications, which can stably power modules with different operating voltage requirements, such as radar detection modules, Bluetooth control modules, lighting driver modules, and UV sterilization driver modules, ensuring that each module can work normally under the appropriate voltage, thereby improving the stability and reliability of the entire panel light system.

[0027] like Figure 1 As shown, in a preferred embodiment, the radar detection module 11 is a 24G millimeter-wave radar module. The radar detection module 11 has a first transmitting port T111 and a first receiving port T112 interconnected with the Bluetooth control module 12, and a power input terminal connected to the power supply unit 3. Specifically, the 24G millimeter-wave radar module, i.e., the 24G MK module, has a sensing angle of not less than 120°, a sensing distance of not less than 5 meters, supports detection through non-metallic obstructions (glass, plastic) with a thickness ≤5mm, and can identify stationary human bodies (such as those sitting still or in a breathing state). Thus, compared to traditional infrared sensors and other frequency band radars, the 24G millimeter-wave radar module has a shorter wavelength and higher detection accuracy, accurately identifying the subtle movements of both dynamic and static human bodies. This solves the problems of static missed detections and susceptibility to environmental interference associated with infrared sensors, ensuring stable judgment of human body status under strong light and high temperature conditions, and providing accurate data for lighting and sterilization control. Its first transmitting port T111 and first receiving port T112 communicate with the Bluetooth control module and work with an independent power supply to ensure stable operation, thereby improving the collaborative efficiency and reliability of the dual-mode detection and control unit.

[0028] like Figure 3As shown, the Bluetooth control module 12 is provided with a second receiving port T121, a second transmitting port T122, a first drive control output port T11, and a second drive control output port T12, which are interactively connected to the radar detection module 11 to realize bidirectional data interaction. The first drive control output port T11 is provided with at least one PWM control signal output terminal. In practical implementation, the lighting device connected to the lighting drive module is an LED dual-color light strip, which can emit white light or yellow light respectively. Therefore, the first drive control output port T11 has two PWM control signal output terminals, namely the first PWM control signal output terminal T111 and the second PWM control signal output terminal T112, which can output two independent PWM control signals with independent duty cycles, used to adjust the brightness and color temperature of the white light strip or the yellow light strip of the lighting drive module respectively. The other second drive control output port T12 is used to control the start and stop of the UV sterilization drive module. At the same time, the Bluetooth control module 12 can use a Bluetooth MESH chip, such as the MHCB12S series or TLSR8258, which can not only realize the above functions, but also communicate wirelessly with external smart terminals (such as mobile APP) to realize remote status viewing and parameter setting. In this way, the first and second drive control output ports have clear division of labor, independently controlling the lighting and UV sterilization drives respectively, ensuring that the logic of the two does not interfere with each other, ensuring timely lighting response, and ensuring that the sterilization function is safe and controllable. Furthermore, the bidirectional data interaction port design with the radar detection module ensures efficient transmission of human status signals and control commands, providing stable data link support for intelligent linkage driven by humans (such as lights turning on when someone enters and sterilization when someone leaves). In addition, the dual PWM control signal output terminals independently adjust the brightness of the white and yellow light of the LED dual-color light strip, which can flexibly achieve fine adjustment of color temperature and brightness to meet the lighting needs of different scenarios (such as warm light to create a cozy atmosphere, and white light suitable for work and study), thus improving the user experience.

[0029] like Figure 4 As shown, in a preferred embodiment, the power supply unit 3 includes a rectifier and filter circuit 31, a DC-DC converter circuit 32, and a low-dropout linear regulator circuit 33 connected in sequence. The output terminal of the rectifier and filter circuit 31 serves as the first power supply output terminal T31, labeled HV in the figure, for providing a high DC voltage. The output terminal of the DC-DC converter circuit 32 serves as the second power supply output terminal T32, for providing a 5V DC voltage. The output terminal of the low-dropout linear regulator circuit 33 serves as the third power supply output terminal T33, for providing a 3.3V DC voltage.

[0030] Specifically, the rectifier and filter circuit 31 includes an input protection sub-circuit 311, a common-mode inductor sub-circuit 312, an EMI and rectifier sub-circuit 313, and a filter sub-circuit 314 connected in sequence. The input protection sub-circuit 311 includes a varistor RV1 connected in parallel between the external AC neutral line N and the live line L, and a fuse resistor FR connected in series in the input path of the live line L.

[0031] The common-mode inductor sub-circuit 312 is a common-mode inductor, including a first coil and a second coil.

[0032] The EMI and rectifier circuit 313 includes at least a rectifier bridge BD1; in specific implementations, it also includes components for suppressing electromagnetic interference, such as a first inductor L2, a first resistor R25, and a first capacitor CX1. The AC input terminal of the rectifier bridge BD1 is connected to the output terminals of the first and second coils of the common-mode inductor in the common-mode inductor sub-circuit, and its output terminal serves as the first power supply output terminal, converting AC voltage into DC voltage.

[0033] The filter sub-circuit 314 includes a first polarity capacitor EC1, whose positive terminal is connected to the output terminal of the rectifier bridge BD1 and whose negative terminal is grounded, for preliminary filtering of the rectified DC voltage; it also includes a first diode D5, whose anode is connected to the output terminal of the rectifier bridge BD1 and whose cathode is grounded through a forward-connected second polarity capacitor EC2; thus, it plays a role in further stabilizing the voltage or filtering, so as to provide a more stable DC power supply.

[0034] The DC-DC conversion circuit 32 includes: a power management chip U2, a linear regulator U3, and peripheral components; the power management chip U2 is used to perform preliminary conversion or conditioning of the input voltage; the linear regulator U3 is connected to the output terminal of the power management chip U2, and is used to further regulate the voltage after the power management chip U2 processes it, and its output terminal is used as a second power supply output terminal. The low-dropout linear regulator circuit 33 is an LDO regulator circuit, including an LDO regulator chip U4 and its peripheral components. The LDO regulator chip U4 is connected to the second power supply output terminal, and its output terminal serves as the third power supply output terminal. Specifically, the power management chip U2 can be an AC-DC non-isolated power management chip of model BP2525DC, the linear regulator U3 can be a low-dropout linear regulator of model ME6208A33PG, and the LDO regulator chip U4 can be an LDO regulator chip of model ME6231C33M35G.

[0035] As described above, the power supply unit in this case can output three different voltages: HV high voltage, 5V DC voltage, and 3.3V DC voltage, which can meet the power supply requirements of different modules in the panel lights. Specifically, the varistor RV1 in the input protection sub-circuit of the rectifier and filter circuit can quickly reduce its resistance value when the voltage rises abnormally, introducing the overvoltage to ground and protecting the subsequent circuits; the fuse resistor FR melts when the current is too high, preventing the circuit from being damaged by overcurrent. The common-mode inductor sub-circuit is used to suppress common-mode interference signals in the external AC power, such as grid noise and electromagnetic radiation interference, while preventing interference signals generated inside the circuit from being conducted to the external power grid, thus achieving electromagnetic compatibility (EMC) protection. The rectifier bridge BD1 in the EMI and rectifier sub-circuit converts AC power to DC power; the filter sub-circuit further filters out the ripple in the DC high voltage through polarized capacitors (EC1, EC2) and diode D5, outputting a pure and stable DC high voltage, providing a high-quality power input for subsequent circuits. Furthermore, the power management chip U2 in the DC-DC converter circuit performs preliminary conversion or conditioning of the input voltage, while the linear regulator U3 further stabilizes the voltage, ensuring a stable 5V DC output voltage. This provides a reliable power supply for the relevant modules and effectively reduces the impact of voltage fluctuations on module performance. In addition, the LDO regulator chip U4 in the low-dropout linear regulator circuit converts the 5V voltage to 3.3V, featuring low dropout and low ripple. This provides a stable 3.3V DC voltage for radar detection modules with high power stability requirements, ensuring accurate and stable operation. Thus, by dividing the power supply unit into a rectifier and filter circuit, a DC-DC converter circuit, and a low-dropout linear regulator circuit, with each module functioning independently, faulty modules can be quickly located during maintenance and repair, facilitating replacement and repair, and reducing maintenance costs and difficulty.

[0036] Furthermore, the power supply unit 3 also includes an AC voltage output circuit 34 connected to the output terminal of the common-mode inductor sub-circuit 312 via a first resistor R25. The AC terminal in the figure is marked as its AC output terminal. Thus, the AC output terminal can serve as a backup power interface, providing compatible power for any AC-powered devices that may be added to the system, eliminating the need for an additional independent power supply circuit. This simplifies circuit modifications for subsequent functional upgrades and enhances the product's adaptability to various scenarios. In addition, the AC voltage output circuit 34 leverages the existing common-mode interference suppression capabilities of the common-mode inductor sub-circuit, using the first resistor R25 to extract AC voltage and provide current-limiting protection. This eliminates the need for additional independent anti-interference or conversion modules, reducing hardware costs and circuit complexity while expanding functionality, thus balancing practicality and economy. Simultaneously, the four circuits in the power supply unit 3 provide the panel light system with diverse DC (HV, 5V, 3.3V) and AC power supply options, meeting both the DC requirements of internal modules and the AC power needs of external expansion devices. This makes the entire power system more compatible and adaptable to more complex application scenarios.

[0037] like Figure 5 As shown, the lighting driving module 21 includes: at least one lighting driving circuit; Each of the lighting drive circuits is provided with a high-voltage input terminal connected to the first power supply output terminal, a control input terminal connected to the first drive control output port T11 of the Bluetooth control module 12, and a lighting output terminal for connecting to an external lighting drive. Each lighting drive circuit includes a BP2956DS LED constant current driver chip and its peripheral circuitry. This provides a stable DC current to each individual lighting device.

[0038] The lighting driving device connected to the lighting driving module 21 is a dual-color LED lamp capable of emitting white or yellow light; the lighting driving module 21 includes two lighting driving circuits, namely a first lighting driving circuit 211 for driving the white LED light strip of the dual-color LED lamp and a second lighting driving circuit 212 for driving the yellow LED light strip of the dual-color LED lamp.

[0039] The first lighting driving circuit 211 includes: an LED constant current driving chip U21, a diode D1, capacitors (C4, EC7, C11), resistors (R8-R10), inductors (L3, LB1, LB2), and a PWM control terminal (PWM-W); the lighting output terminal consists of the WW+ and LED- pins.

[0040] The second lighting driving circuit 212 includes: an LED constant current driving chip U22, a diode D2, capacitors (C5, EC8, C12), resistors (R14-R16), inductors (L4, LB3, LB4), and a PWM control terminal (PWM-C). The lighting output terminals are the CW+ and LED- pins.

[0041] Specifically, the high-voltage input terminal of the power management chip (U1 / U2) is connected to the high-voltage output terminal of the power supply unit to convert the input high-voltage electricity; the diode (D1 / D2) is used to prevent reverse current flow and protect the circuit; the capacitor (C4 / C5, EC7 / EC8, C11 / C12) is used for filtering and stabilizing the circuit operating voltage; the resistor (R8-R10, R14-R16, etc.) is used to set circuit parameters or limit current; the inductor (L3 / L4, LB1-LB4) is used for energy storage and transmission, and works with other components to realize voltage transformation; the PWM control terminal (PWM1 / PWM2) is connected to the Bluetooth control module to receive PWM control signals and adjust the brightness of the lighting drive.

[0042] As described above, the lighting driver module (21) in this case uses two independent lighting driver circuits (the first lighting driver circuit drives the white LED light strip, and the second lighting driver circuit drives the yellow LED light strip) in conjunction with the dual PWM control signals (PWM-W, PWM-C) of the Bluetooth control module to independently adjust the brightness of the white and yellow light, so as to achieve continuous color temperature adjustment from cool white light to warm yellow light, meet the needs of different scenarios, and improve the user's lighting experience. In addition, the BP2956DS LED constant current driver chip and its peripheral circuit are used. By utilizing the constant current output characteristics of the chip, the working current of the LED light strip can be precisely controlled to avoid brightness flickering or accelerated aging of the LED beads caused by current fluctuations. At the same time, the filtering and freewheeling circuits formed by peripheral components (such as inductors and diodes) further stabilize the output current, ensuring that the white and yellow LED light strips work in a stable state, effectively extending the service life of the lighting driver. The two lighting driver circuits are independent of each other, and their respective power input, control signals and output circuits do not cross-interfere. Even if one of them fails (such as component damage), the other can still work normally, avoiding the failure of the overall lighting function due to a single circuit failure. Meanwhile, each lighting driver circuit adopts a standardized modular design. If it is necessary to increase the number of lighting circuits or replace LED light strips of different specifications in the future, the circuit architecture can be reused and the parameters adjusted, which reduces the expansion cost and maintenance difficulty.

[0043] like Figure 6 As shown, the UV sterilization drive module 22 includes: an enable control circuit 221 and a transistor cascade drive circuit 222 connected to the enable control circuit 221; The enable control circuit 221 is connected to the Bluetooth control module 12 and is used to receive the signal from the second drive control output port T12 to control the switching on and off of the transistors in the transistor cascade drive circuit 222.

[0044] The enable control circuit 221 includes a first NPN transistor Q3, an eleventh resistor R26, a twelfth resistor R27, an eleventh diode D9, and a relay 2211. The base of the first NPN transistor Q3 is connected to the second drive control output port T12 through the eleventh resistor R26 to receive control signals. The emitter is grounded, and the collector is connected to one end of the relay 2211 coil. The other end of the relay coil is connected to the second power supply output terminal. The eleventh diode D9 is forward-biased and connected between one end and the other end of the relay coil. The twelfth resistor R27 is connected between the cathode of the eleventh diode D9 and the second drive control output port T12. The common terminal of the relay 2211 is connected to the external high-voltage input terminal HV_VIN, and the normally open contact is used as the high-voltage output terminal HVOUT to connect to an external UV lamp. The external high-voltage input terminal HV_VIN can also be the first power supply output terminal.

[0045] The cascaded transistor drive circuit 222 includes: eleventh transistor Q1, twelfth transistor Q2, ninth capacitor C9, tenth capacitor C10, sixth inductor L6, seventh inductor L7, eighth inductor L8, ninth inductor L9, nineteenth resistor (R19), twentieth resistor R20, twenty-first resistor R21, twenty-second resistor R22, twenty-third resistor R23, twenty-fourth resistor R24, nineteenth diode D19, tenth diode D10, ninth polarity capacitor EC9, tenth polarity capacitor EC10, and UV lamp device 220; The collector of transistor Q1 (11-th generation) is directly connected to the external high-voltage input terminal HV_VIN to introduce the external high-voltage power supply. The base of transistor Q1 is connected to one end of inductor L8 (8th generation) through resistor R24 ​​(24th generation), and the other end of inductor L8 is connected to one end of resistor R19 (19th generation), forming part of the input path for the base drive signal. Simultaneously, diode D19 (19th generation) is connected in reverse between the base and emitter of transistor Q1 (11-th generation). The emitter of transistor Q1 (11-th generation) is connected to one end of resistor R19 (19th generation) through resistor R22 (22nd generation), and the other end of resistor R19 is connected to the collector of transistor Q2 (12-th generation), achieving the electrical connection between the emitter of transistor Q1 (11-th generation) and the collector of transistor Q2 (12-th generation).

[0046] The external high-voltage input terminal HV_VIN is positively connected to ground via the ninth polarity capacitor EC9; the positive terminal of the ninth polarity capacitor EC9 is connected to the other end of the eighth inductor L8 via the ninth capacitor C9. The emitter of the 12-stage transistor Q2 is grounded through the 23rd resistor R23, the positive terminal of the 10th polarity capacitor EC10 is grounded, and the negative terminal is connected to the base of the 12-stage transistor Q2 in sequence through the 6th inductor L6 and the 21st resistor R21; the 10th diode D10 is forward connected between the emitter and base of the 12-stage transistor Q2. One end of the nineteenth resistor R19 and the base of the twelfth transistor Q2 are both connected to one end of the ninth inductor L9 through the twentieth resistor R20. The other end of the ninth inductor L9 is connected to one end of the UV lamp device 220 through the seventh inductor L7. The external high voltage input terminal HV_VIN is connected to the other end of the UV lamp device 220 through the tenth capacitor C10.

[0047] As described above, the enable control circuit 221 of the UV sterilization drive module 22 in this case uses a multi-level control link through the Bluetooth control module 12, the first NPN transistor Q3, and the relay 2211 to accurately respond to the human presence detection signal of the second drive control output port T12. When the 24G millimeter-wave radar detects a human body, the Bluetooth control module immediately outputs a signal to cut off the power supply to the relay coil, and the normally open contact of the relay 2211 opens, directly cutting off the high-voltage path between the external high-voltage input terminal HV_VIN and the UV lamp, thus preventing the UV lamp from being accidentally started at the power source. In unmanned scenarios, the relay contacts close, providing a high-voltage foundation for the subsequent drive circuit, completely avoiding the risks of eye damage and skin burns caused by human exposure to ultraviolet light, and improving safety. Specifically, the eleventh diode D9 connected in reverse parallel in the enable control circuit can effectively absorb the back electromotive force generated when the relay coil is de-energized, preventing high voltage from impacting the first NPN transistor Q3 and the output port of the Bluetooth control module, further enhancing the reliability of safety protection.

[0048] Furthermore, the cascaded transistor drive circuit 222 employs a design that cascades eleven transistors Q1 and twelve transistors Q2. Combined with the current-limiting and voltage-dividing effect of the twenty-fourth resistor R24 ​​and the nineteenth resistor R19, it can precisely control the base drive signal of Q1, enabling Q1 to stably withstand the high voltage of the external high-voltage input terminal HV_VIN, thus avoiding breakdown damage caused by insufficient withstand voltage when driving a single transistor. At the same time, the cascaded structure improves the switching response speed of the circuit, enabling it to quickly provide the high-frequency high voltage required for the UV lamp to ignite, ensuring that the UV lamp lights up quickly and enters a stable sterilization state, avoiding untimely sterilization due to drive delay.

[0049] In addition, the ninth polarity capacitor EC9 is connected in parallel between HV_VIN and ground, which can filter out low-frequency ripple in the high voltage input and provide a stable DC high voltage for the collector of Q1; the ninth capacitor C9 is connected between the positive terminal of EC9 and the eighth inductor L8. With the inductance energy storage characteristics of L8 and L9, it can smooth the fluctuations of the base drive signal and the UV lamp drive current, and reduce the impact of voltage change on the UV lamp electrode; the tenth capacitor C10 is directly connected to HV_VIN and the other end of the UV lamp, further optimizing the voltage waveform across the UV lamp, ensuring a stable UVC ultraviolet intensity output by the UV lamp, avoiding a decrease in sterilization efficiency due to voltage fluctuations, and ensuring the sterilization effect and odor elimination ability of bacteria in enclosed spaces. The nineteenth diode, D19, is connected in reverse parallel between the base and emitter of the eleventh transistor, Q1. This clamps the reverse voltage between the base and emitter of Q1, preventing high reverse voltage from breaking down the emitter junction of Q1 when the base drive signal is abnormal. The tenth diode, D10, is connected in forward polarity between the emitter and base of the twelfth transistor, Q2. This provides forward bias protection for the base of Q2, preventing damage caused by excessive base current or reverse voltage surges, and extending the service life of the core switching components.

[0050] The twenty-second resistor R22 and the twenty-third resistor R23 provide current limiting for the emitters of Q1 and Q2, respectively, to prevent overheating and burnout caused by excessive current when the transistors are turned on. The twenty-first resistor R21 is connected in series between the tenth polarity capacitor EC10 and the base of Q2. In conjunction with the filtering effect of EC10, it can limit the base current of Q2 and smooth the base control signal, avoiding frequent switching losses of the transistors due to current fluctuations. This further improves the stability and reliability of the circuit operation and reduces the probability of module failure.

[0051] In summary, this utility model discloses a panel light circuit with sterilization and human presence sensing functions, aiming to solve the problems of limited functionality and insufficient UV sterilization safety in existing panel lights. It includes a dual-mode detection control unit, a dual-drive execution unit, and a power supply unit: the dual-mode detection control unit consists of a 24G millimeter-wave radar module and a Bluetooth control module, accurately determining the presence of a human through data interaction; the dual-drive execution unit includes a lighting drive module and a UV sterilization drive module; the power supply unit outputs power through a three-stage circuit to adapt to the power supply needs of each module. This utility model achieves intelligent coordination of lighting when someone enters and sterilization when someone leaves, combining the advantages of UV sterilization safety protection, flexible lighting adjustment, and stable power supply, making it suitable for indoor scenarios such as homes and offices.

[0052] As stated above, this case protects a panel light circuit with sterilization and human presence sensing functions, and all technical solutions that are the same as or similar to this case should be considered to fall within the protection scope of this case.

Claims

1. A panel light circuit with sterilization and human presence sensing functions, characterized in that, include: Dual-mode detection control unit (1): includes a radar detection module (11) and a Bluetooth control module (12); the radar detection module (11) and the Bluetooth control module (12) are interconnected to determine whether there is a person or no one through data exchange; the Bluetooth control module (12) is also provided with at least two drive control output ports; Dual-drive execution unit (2): includes a lighting drive module (21) and a UV sterilization drive module (22) that are respectively connected to one of the drive control output ports of the Bluetooth control module (12). Power supply unit (3): used to convert the external input voltage into at least two different DC voltages to power each module of each unit; The at least two drive control output ports include: a first drive control output port (T11) connected to the lighting drive module (21) and used to control the lighting drive module (21) to start when a human body is detected / used to turn off or operate at low power when a human body is detected to leave; and a second drive control output port (T12) connected to the UV sterilization drive module (22) and used to control the UV sterilization drive module (22) to start when a human body is detected to leave.

2. The panel light circuit with sterilization and human presence sensing functions according to claim 1, characterized in that, The radar detection module (11) is a 24G millimeter-wave radar module; the radar detection module (11) is provided with a first transmitting port (T111) and a first receiving port (T112) that are interactively connected to the Bluetooth control module (12), and a power supply input terminal that is connected to the power supply unit (3).

3. The panel light circuit with sterilization and human presence sensing functions according to claim 1 or 2, characterized in that, The Bluetooth control module (12) is provided with a second receiving port (T121), a second sending port (T122), a first drive control output port (T11), and a second drive control output port (T12) that are interactively connected to the radar detection module (11) to realize bidirectional data interaction. The first drive control output port (T11) is provided with at least one PWM control signal output terminal.

4. The panel light circuit with sterilization and human presence sensing functions according to claim 1, characterized in that, The power supply unit (3) includes a rectifier filter circuit (31), a DC-DC converter circuit (32), and a low-dropout linear regulator circuit (33) connected in sequence; the output terminal of the rectifier filter circuit (31) serves as the first power supply output terminal, the output terminal of the DC-DC converter circuit (32) serves as the second power supply output terminal, and the output terminal of the low-dropout linear regulator circuit (33) serves as the third power supply output terminal.

5. The panel light circuit with sterilization and human presence sensing functions according to claim 4, characterized in that, The rectifier and filter circuit (31) includes an input protection sub-circuit (311), a common mode inductor sub-circuit (312), an EMI and rectifier sub-circuit (313), and a filter sub-circuit (314) connected in sequence. The input protection sub-circuit (311) includes a varistor (RV1) connected in parallel between the external AC neutral wire (N) and the live wire (L) and a fuse resistor (FR) connected in series in the input path of the live wire (L). The common-mode inductor sub-circuit (312) is a common-mode inductor, which includes a first coil and a second coil; The EMI and rectifier circuit (313) includes at least a rectifier bridge (BD1), wherein the AC input terminal of the rectifier bridge (BD1) is connected to a common-mode inductor and the output terminal serves as the first power supply output terminal; The filter sub-circuit (314) includes a first polarized capacitor (EC1) with its positive terminal connected to the output terminal of the rectifier bridge (BD1) and its negative terminal grounded, and a first diode (D5) with its anode connected to the output terminal of the rectifier bridge (BD1) and its cathode grounded through a second polarized capacitor (EC2) connected in the forward direction.

6. The panel light circuit with sterilization and human presence sensing functions according to claim 4, characterized in that, The DC-DC conversion circuit (32) includes: a power management chip (U2), a linear regulator (U3), and peripheral components; the power management chip (U2) is used to perform preliminary conversion or conditioning of the input voltage; the linear regulator (U3) is connected to the output terminal of the power management chip (U2) and is used to further regulate the voltage after it has been processed by the power management chip (U2) and use its output terminal as a second power supply output terminal; The low-dropout linear regulator circuit (33) is an LDO regulator circuit, including an LDO regulator chip (U4) and its peripheral components; the LDO regulator chip (U4) is connected to the second power supply output terminal, and its output terminal serves as the third power supply output terminal.

7. The panel light circuit with sterilization and human presence sensing functions according to claim 4, characterized in that, The lighting driving module (21) includes: at least one lighting driving circuit; Each of the lighting drive circuits is provided with a high voltage input terminal connected to the first power supply output terminal, a control input terminal connected to the first drive control output port (T11) of the Bluetooth control module (12), and a lighting output terminal for connecting to an external lighting drive. Each of the lighting drive circuits includes an LED constant current driver chip of model BP2956DS and its peripheral circuitry.

8. The panel light circuit with sterilization and human presence sensing functions according to claim 7, characterized in that, The lighting driving device connected to the lighting driving module (21) is a dual-color LED lamp that can emit white light or yellow light; the lighting driving module (21) includes two lighting driving circuits, namely a first lighting driving circuit (211) for driving the white LED light strip of the dual-color LED lamp and a second lighting driving circuit (212) for driving the yellow LED light strip of the dual-color LED lamp.

9. The panel light circuit with sterilization and human presence sensing functions according to claim 4, characterized in that, The UV sterilization drive module (22) includes: an enable control circuit (221) and a transistor cascade drive circuit (222) connected to the enable control circuit (221). The enable control circuit (221) is connected to the Bluetooth control module (12) and is used to receive the signal from the second drive control output port (T12) to control the switching on and off of the transistors in the transistor cascade drive circuit (222).

10. The panel light circuit with sterilization and human presence sensing functions according to claim 9, characterized in that, The enable control circuit (221) includes a first NPN transistor (Q3), an eleventh resistor (R26), a twelfth resistor (R27), an eleventh diode (D9), and a relay (2211). The base of the first NPN transistor (Q3) is connected to the second drive control output port (T12) through the eleventh resistor (R26), the emitter is grounded, and the collector is connected to one end of the relay (2211) coil. The other end of the relay coil is connected to the second power supply output terminal. The eleventh diode (D9) is forward-biased between one end and the other end of the relay coil. The twelfth resistor (R27) is connected between the cathode of the eleventh diode (D9) and the second drive control output port (T12). The common terminal of the relay (2211) is connected to the external high-voltage input terminal, and the normally open contact is used as the high-voltage output terminal to connect to an external UV lamp. The cascaded transistor drive circuit (222) includes: an eleventh transistor (Q1), a twelfth transistor (Q2), a ninth capacitor (C9), a tenth capacitor (C10), a sixth inductor (L6), a seventh inductor (L7), an eighth inductor (L8), a ninth inductor (L9), a nineteenth resistor (R19), a twentieth resistor (R20), a twenty-first resistor (R21), a twenty-second resistor (R22), a twenty-third resistor (R23), a twenty-fourth resistor (R24), a nineteenth diode (D19), a tenth diode (D10), a ninth polarized capacitor (EC9), a tenth polarized capacitor (EC10), and a UV lamp device (220). The collector of the eleventh transistor (Q1) is connected to an external high-voltage input terminal. The base is connected to one end of the eighth inductor (L8) through the twenty-fourth resistor (R24). The emitter is connected to one end of the nineteenth resistor (R19) through the twenty-second resistor (R22). The other end of the eighth inductor (L8) is connected to one end of the nineteenth resistor (R19). The other end of the nineteenth resistor (R19) is connected to the collector of the twelfth transistor (Q2). The nineteenth diode (D19) is connected in reverse between the base and emitter of the eleventh transistor (Q1). The external high-voltage input terminal is positively connected to the ground via the ninth polarity capacitor (EC9); the positive terminal of the ninth polarity capacitor (EC9) is connected to the other end of the eighth inductor (L8) via the ninth capacitor (C9). The emitter of the 12-stage transistor (Q2) is grounded through the 23rd resistor (R23), the positive terminal of the 10th polarity capacitor (EC10) is grounded, and the negative terminal is connected to the base of the 12-stage transistor (Q2) through the 6th inductor (L6) and the 21st resistor (R21) in sequence; a 10th diode (D10) is forward connected between the emitter and base of the 12-stage transistor (Q2). One end of the nineteenth resistor (R19) and the base of the twelfth transistor (Q2) are both connected to one end of the ninth inductor (L9) through the twentieth resistor (R20). The other end of the ninth inductor (L9) is connected to one end of the UV lamp device (220) through the seventh inductor (L7). The external high voltage input terminal is connected to the other end of the UV lamp device (220) through the tenth capacitor (C10).

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