Inductive strong-turn-on light-operated circuit

Abstract

The utility model discloses an induction strong-starting light-operated circuit, which comprises a power supply module, a strong-starting module, an induction module, a signal mixing module and a dimming driving module, the power supply module converts commercial power into high-voltage direct current to drive the light source through a rectifier bridge and a high-low voltage isolation circuit, and generates low-voltage direct current to be used by the control circuit; the forced start module is connected in series with the optocoupler isolation unit through a trigger switch, and converts the high voltage of the commercial power into an isolated forced start signal. The sensing module outputs a sensing control signal based on the environment sensor; the signal mixing module forcibly gives priority to the forced start signal through a logic circuit, so that control switching of the induction signal and the forced start signal is realized; the dimming driving module controls on-off and dimming of the light source according to the mixed signal. According to the utility model, the technical problems of low safety, signal interference and difficult integration in the existing induction intense-opening light control technology are solved.

Description

A sensor-activated light control circuit Technical Field

[0001] This utility model relates to the field of electronic lighting control technology, and in particular to a sensor-activated high-intensity light control circuit. Background Technology

[0002] Currently available sensor-based lighting fixtures, such as infrared sensor lights, voice-activated lights, and microwave sensor lights, are widely used in public places like stairwells, corridors, and parking lots due to their intelligent and energy-saving features. They trigger lighting by detecting environmental parameters such as human movement, sound, or microwave signals, achieving on-demand illumination. However, when the sensor malfunctions, the environmental signal is weak, or there is no human activity, the lights cannot start normally; in scenarios requiring long-term illumination, the lights cannot remain lit continuously, leading to limited use and even safety hazards. Existing technologies typically address these issues by directly short-circuiting the sensing circuit or adding an independent power supply circuit to achieve forced starting. However, these methods have the following drawbacks:

[0003] Low safety: The high-voltage mains power and the low-voltage control circuit are not completely isolated, which can easily lead to damage to circuit components or electric shock risk;

[0004] Signal interference: Forced start and inductive control signals are prone to mutual interference, causing abnormal operation of the lamps;

[0005] Integration difficulties: The complex peripheral circuit design increases the cost of modification and makes it difficult to adapt to the existing lamp structure. Summary of the Invention

[0006] The main purpose of this invention is to propose an inductive strong-start light control circuit, which aims to solve the technical problems of low security, signal interference and integration difficulties in existing inductive strong-start light control technology.

[0007] To achieve the above objectives, the first aspect of this utility model proposes an inductively activated light control circuit, comprising a power supply module, an activated module, an induction module, a signal mixing module, and a dimming drive module; the input terminal of the power supply module is connected to AC mains power, and the output terminal outputs DC power; the activated module includes a trigger switch and an electrical isolation unit connected in series on the AC mains L line, the electrical isolation unit isolating the high voltage of the AC mains power from the low voltage control circuit, and the output terminal generates an activated signal; the induction module generates an induction control signal based on environmental detection; the signal mixing module includes a signal transmission circuit and a signal selection circuit; the first input terminal of the signal transmission circuit is connected to the output terminal of the electrical isolation unit, the second input terminal is connected to the output terminal of the induction module, and the output terminal is connected to the input terminal of the signal selection circuit; the signal selection circuit outputs a high-level dimming control signal when the activated signal is valid, and outputs an induction control signal as a dimming control signal when the activated signal is invalid; the dimming drive module drives the light source according to the dimming control signal.

[0008] Preferably, the electrical isolation unit is an optocoupler, and its input terminal is connected to the trigger switch via a resistor network.

[0009] Preferably, the resistor network includes a first resistor, a second resistor, and a third resistor; one end of the first resistor is connected to the trigger switch, and the other end is connected to one end of the second resistor and the first input terminal of the optocoupler; one end of the third resistor is connected to the neutral (N) line of the mains, and the other end is connected to the other end of the second resistor and the second input terminal of the optocoupler.

[0010] Preferably, the forced start module further includes a first diode and a second diode for suppressing reverse voltage surges; the positive terminal of the first diode is connected to the trigger switch, and the negative terminal is connected to the first resistor; the positive terminal of the second diode is connected to the second input terminal of the optocoupler element, and the negative terminal is connected to the first input terminal of the optocoupler element.

[0011] Preferably, the output terminal of the optocoupler is provided with a filter circuit, including a first capacitor and a fourth resistor; one end of the first capacitor is connected to the first output terminal of the optocoupler, and the other end, together with the second output terminal of the optocoupler and one end of the fourth resistor, is connected to the strong start signal output terminal, and the other end of the fourth resistor is grounded.

[0012] Preferably, the signal transmission circuit includes a third diode, a fourth diode, a fifth resistor, and a sixth resistor; the positive terminal of the third diode is connected to the sensing signal output terminal of the sensing module, and the negative terminal is connected to the input terminal of the signal selection circuit via the fifth resistor; the positive terminal of the fourth diode is connected to the strong start signal output terminal, and the negative terminal is connected to the input terminal of the signal selection circuit via the sixth resistor.

[0013] Preferably, the signal transmission circuit further includes a filtering circuit, which includes a seventh resistor and a second capacitor; the seventh resistor and the second capacitor are connected in parallel between the output terminal of the signal transmission circuit and ground to form an RC filter network to filter out signal noise.

[0014] Preferably, the signal selection circuit includes a first transistor, the base of which is connected to the output terminal of the signal transmission circuit, the collector of which is connected to the DC output terminal of the power supply module, and the emitter outputs a dimming control signal to the dimming drive module.

[0015] Preferably, the signal selection circuit further includes an eighth resistor, through which the emitter of the first transistor is grounded.

[0016] Preferably, the power supply module includes a high-voltage DC circuit and a low-voltage DC circuit; the high-voltage DC circuit is used to convert AC mains power into high-voltage DC power to supply power to the dimming drive module; the low-voltage DC circuit includes a step-down constant voltage chip, used to convert the high-voltage DC power into low-voltage DC power to supply power to the sensing module, the start-up module and the signal mixing module.

[0017] This invention proposes an inductive forced-start light control circuit. The forced-start module completely isolates the high-voltage mains power from the low-voltage control circuit through an electrical isolation unit, avoiding component damage or electric shock risks caused by high-voltage intrusion. At the same time, it suppresses the influence of electromagnetic interference on signal transmission, ensuring long-term stable operation of the system. The signal mixing module achieves seamless switching between forced start and inductive control through priority logic that prioritizes the forced-start signal. Users can manually trigger the lamp to stay on to meet special needs, while automatically reverting to inductive mode during daily use, balancing flexibility and energy saving goals. In inductive mode, the lamp only lights up when it detects human activity or environmental triggering, reducing ineffective energy consumption. The forced-start mode directly controls the dimming drive module through a high-level signal, avoiding lighting interruptions caused by sensor failure or insufficient environmental signals. Furthermore, by preferably using an optocoupler as the electrical isolation unit and employing a voltage divider network composed of a first resistor, a second resistor, and a third resistor, precise voltage division between the mains high voltage and the optocoupler input is achieved. Through the coordinated design of the first and second diodes, a two-phase voltage protection system is constructed, ensuring reliable triggering of the forced start function and achieving full-cycle adaptability to complex mains operating conditions. An RC filter circuit is set at the output of the electrical isolation unit to suppress noise, improving signal reliability in complex environments. The third and fourth diodes in the signal transmission circuit 41 utilize the unidirectional conduction characteristics of diodes to ensure that the forced start signal takes precedence over the sensing signal, avoiding logic competition that could lead to lighting control conflicts. Simultaneously, the diode conduction time is several... This invention provides a block that ensures real-time control and isolates the impact of any signal source failure to prevent system paralysis. An RC filter circuit at the signal transmission circuit output suppresses noise, improving signal reliability in complex environments. The signal selection circuit uses a first transistor to drive signal switching via current, exhibiting strong resistance to voltage fluctuations and preventing false triggering. The transistor's on / off action is completed within nanoseconds, enhancing the real-time performance of lighting control. A high-voltage DC circuit powers the dimming drive module and LED load, while a low-voltage DC circuit powers the sensing module, forced-start module, and signal mixing module. Combined with the synergistic effect of the transformer and electrical isolation unit, this effectively blocks interference from the high-voltage circuit to the low-voltage control circuit. In summary, this invention solves the technical problems of low safety, signal interference, and integration difficulties in existing inductive forced-start light control technologies. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the module principle of a sensor-activated light control circuit according to the present invention;

[0020] Figure 2 is a schematic diagram of the principle of the strong start module of the induction strong start light control circuit of this utility model;

[0021] Figure 3 is a schematic diagram of the hybrid control module of the induction strong light control circuit of this utility model.

[0022] In the attached diagram: 1-Power supply module, 11-High voltage DC circuit, 12-Low voltage DC circuit, 2-Force start module, 3-Induction module, 4-Signal mixing module, 41-Signal transmission circuit, 42-Signal selection circuit, 5-Dimming drive module.

[0023] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that if the embodiments of this utility model involve directional indicators, such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] As shown in Figures 1 to 3, the first aspect of this utility model proposes an inductively activated light control circuit, including a power supply module 1, an activated light control module 2, an induction module 3, a signal mixing module 4, and a dimming drive module 5. The input terminal of the power supply module 1 is connected to AC mains power, and the output terminal outputs DC power. The activated light control module 2 includes a trigger switch and an electrical isolation unit connected in series on the AC mains L-line. The electrical isolation unit isolates the high-voltage AC mains power from the low-voltage control circuit, and generates an activated light control signal at its output terminal. The induction module 3 generates an induction control signal based on environmental detection. The signal mixing module 4 includes a signal transmission circuit 41 and a signal selection circuit 42. The first input terminal of the signal transmission circuit 41 is connected to the output terminal of the electrical isolation unit, the second input terminal is connected to the output terminal of the induction module 3, and the output terminal is connected to the input terminal of the signal selection circuit 42. The signal selection circuit 42 outputs a high-level dimming control signal when the activated light control signal is valid, and outputs an induction control signal as a dimming control signal when the activated light control signal is invalid. The dimming drive module 5 drives the light source according to the dimming control signal.

[0028] Specifically, referring to Figure 1, in this embodiment, the input terminal of power module 1 is connected to the mains power, and the 220V AC power is converted into DC power through rectifier bridge DB1 to power each module. The specific output DC voltage is set according to the actual needs of each module. The input terminal of the forced start module 2 is connected to the mains power through trigger switch SW. After the user operates the switch to turn on, a forced start signal is generated. The electrical isolation unit is used to isolate the low-voltage control circuit after the high voltage of the mains power. Optical isolators, magnetic isolators, or capacitive isolators can be used. The sensing module 3 detects environmental signals based on infrared, sound control, or microwave sensors and outputs sensing control signals. The signal mixing module 4 includes a signal transmission circuit 41 and a signal selection circuit 42. The signal transmission circuit 41 receives the forced start signal and the sensing signal. Through the logic selection of the signal selection circuit, the output dimming control signal is controlled. When the forced start signal is valid, the signal selection circuit prioritizes outputting a high-level dimming control signal. Otherwise, it transmits the sensing signal as the dimming control signal. The dimming drive module 5 uses the IC-BP2956 chip, which is used to drive the light source to turn on and off according to the dimming control signal. It should be noted that the trigger switch SW is one of the following: physical mechanical switch, touch-sensitive switch, wireless control module, voice-activated switch, or photosensitive trigger switch. All of the above switches are connected to the resistor network and optocoupler input terminal of the forced start module through interface circuit to ensure that the high voltage isolation characteristics remain unchanged.

[0029] The workflow is as follows: When the user operates the trigger switch, the forced start signal is valid and outputs a high-level dimming control signal through the signal selection circuit, and the dimming drive module drives the lamp to enter the constant-on mode; when the trigger switch is turned off, the signal selection circuit automatically switches to the induction control signal generated by the induction module, and the dimming drive module controls the on / off state of the lamp according to the environmental detection results, realizing the automatic switching between forced start and induction control. Understandably, the forced start module employs optocouplers, magnetic couplers, or capacitive couplers to completely isolate the 220V high-voltage mains power from the low-voltage control circuit, preventing component damage or electric shock risks caused by high-voltage intrusion. Simultaneously, it suppresses electromagnetic interference affecting signal transmission, ensuring long-term stable system operation. The signal mixing module achieves seamless switching between forced start and inductive control through priority logic prioritizing the forced start signal. Users can manually trigger the lights to remain on for special needs such as moving items or maintenance work, while automatically reverting to inductive mode during daily use, balancing flexibility and energy saving. In inductive mode, the lights only illuminate when human activity or environmental triggering is detected, reducing unnecessary energy consumption. The forced start mode directly controls the dimming drive module via a high-level signal, preventing lighting interruptions due to sensor failure or insufficient environmental signals. Understandably, those skilled in the art can make corresponding equivalent improvements based on the module design of this utility model, such as replacing the dimming drive chip from BP2956 with other equivalent devices to adapt to different power lamps or special operating conditions.

[0030] Preferably, in one embodiment of the present invention, the electrical isolation unit is an optocoupler, and its input terminal is connected to the trigger switch via a resistor network.

[0031] Preferably, in one embodiment of the present invention, the resistor network includes a first resistor, a second resistor, and a third resistor; one end of the first resistor is connected to the trigger switch, and the other end is connected to one end of the second resistor and the first input terminal of the optocoupler; one end of the third resistor is connected to the neutral (N) line of the mains, and the other end is connected to the other end of the second resistor and the second input terminal of the optocoupler.

[0032] Specifically, referring to Figures 1 and 3, in this embodiment, the electrical isolation unit uses an optocoupler. Taking the commonly used optocoupler PC817 as an example, its input terminal is connected to the trigger switch SW of the mains L line through a resistor network, and the output terminal generates a strong start signal. The resistor network consists of a first resistor R5, a second resistor R7, and a third resistor R8. One end of the first resistor R5 is connected to the trigger switch SW, and the other end is connected to one end of the second resistor R7 and the first input pin 1 of the optocoupler. One end of the third resistor R8 is connected to the N line, and the other end is connected to the other end of the second resistor R7 and the second input pin 2 of the optocoupler. As is understandable, the first resistor R5, the second resistor R7, and the third resistor R8 together form a voltage divider network, converting the 220V AC mains voltage into the appropriate voltage required for the optocoupler input, ensuring reliable conduction of the optocoupler during triggering. When the trigger switch is on, the voltage of the AC mains L line is divided by the first resistor R5 and the second resistor R7, providing a forward bias voltage to the optocoupler LED, causing it to conduct, and generating a high-level strong start signal at the optocoupler output. When the trigger switch is off, the third resistor R8 pulls the optocoupler input low through the N line, ensuring the optocoupler is cut off, the strong start signal is invalid, and the system switches to induction mode. Through the above design, the resistor network achieves stable generation and reliable isolation of the strong start signal, while also ensuring circuit safety and anti-interference capability. It is understood that those skilled in the art can make corresponding equivalent improvements based on the resistor network voltage divider design and optocoupler isolation unit design of this utility model, depending on the application scenario. For example, the optocoupler element can be replaced with a high-speed optocoupler 6N137 to improve the response speed, or the optocoupler element can be replaced with a voltage-resistant optocoupler TLP785 to adapt to high-voltage scenarios, or the resistor network settings, resistor values, or resistors can be adjusted for different mains voltages / electronic components.

[0033] Preferably, in one embodiment of the present invention, the forced start module 2 further includes a first diode and a second diode for suppressing reverse voltage surges; the positive terminal of the first diode is connected to the trigger switch, and the negative terminal is connected to the first resistor; the positive terminal of the second diode is connected to the second input terminal of the optocoupler element, and the negative terminal is connected to the first input terminal of the optocoupler element.

[0034] Specifically, referring to Figures 1 and 3, in this embodiment, both the first diode D3 and the second diode D4 are high-voltage diodes used to suppress reverse voltage surges. The anode of the first diode D3 is connected to the trigger switch SW, and the cathode is connected to one end of the first resistor R5. The anode of the second diode D4 is connected to pin 2 of the second input terminal of the optocoupler, and the cathode is connected to pin 1 of the first input terminal of the optocoupler. It can be understood that when there is a transient high voltage or voltage fluctuation in the mains power, the first diode D3 and the second diode D4, through their voltage regulation characteristics, can clamp the voltage at the input terminal of the optocoupler within a safe range. The first diode D3, connected in series between the trigger switch SW and the first resistor R5, can suppress the voltage spike at the moment the switch closes, preventing damage to the optocoupler due to overvoltage. The second diode D4 is connected in reverse parallel between pins 1 and 2 of the optocoupler input terminal, conducting during the negative half-cycle of AC or when reverse voltage occurs, limiting the reverse voltage within the regulated value and preventing reverse breakdown of the internal LED of the optocoupler. The forward conduction characteristic of the first diode D3 can block the reverse current path from the N line to the L line during the negative half-cycle of AC power, preventing reverse current from flowing through the optocoupler and resistor network, thereby reducing the risk of circuit false triggering. The voltage stabilizing effect of the second diode D4 can filter out high-frequency noise or surge interference in the mains power, ensuring that the optocoupler only works reliably when forward conducting, and improving the anti-interference capability of the strong start signal. This invention constructs a bidirectional voltage protection system for the strong start module through the coordinated design and parameter optimization of the first diode D3 and the second diode D4, which not only ensures the reliable triggering of the strong start function, but also achieves full-cycle adaptability to complex mains power conditions. It is understood that those skilled in the art can make corresponding equivalent improvements based on the bidirectional coordinated voltage protection design of the withstand voltage diodes in this invention, such as adjusting the diode withstand voltage value for different mains power environments, or integrating the first diode and the second diode into a composite protection device.

[0035] Preferably, in one embodiment of the present invention, the output terminal of the optocoupler is provided with a filter circuit, including a first capacitor and a fourth resistor; one end of the first capacitor is connected to the first output terminal of the optocoupler, and the other end, together with the second output terminal of the optocoupler and one end of the fourth resistor, is connected to the strong start signal output terminal, and the other end of the fourth resistor is grounded.

[0036] Specifically, referring to Figures 1 and 3, in this embodiment, the filter circuit at the output of the optocoupler consists of a first capacitor C2 and a fourth resistor R9. One end of the first capacitor C2 is connected to pin 4 (the collector of the phototransistor) of the optocoupler PC817, and the other end, along with pin 3 (the emitter of the phototransistor) and one end of the fourth resistor R9, is connected to the strong start signal output. The other end of the fourth resistor R9 is grounded, forming an RC filter network. It is understood that the RC filter network can effectively filter out high-frequency noise generated by the optocoupler switching action, ensuring that the strong start signal is jitter-free and avoiding misjudgment by the dimming drive module. Simultaneously, the filter circuit suppresses noise introduced by mains power fluctuations and electromagnetic radiation, improving the reliability of the strong start signal in complex environments. It is understood that those skilled in the art can make corresponding equivalent improvements based on the filter circuit design of this utility model according to the application scenario. For example, they can adjust the capacitance / resistance value for different noise frequency effects, or replace the first capacitor C2 with a low ESR ceramic capacitor to improve high frequency filtering performance, or use a tantalum capacitor to enhance low frequency noise suppression, or use other types of filter circuits according to the application scenario: RC filtering is low cost and simple in structure, suitable for noise suppression in general scenarios; LC filtering has excellent high frequency suppression and is suitable for industrial strong interference environments; π-type filtering balances cost and effect and strengthens the filtering of mid- and low-frequency noise.

[0037] Preferably, in one embodiment of the present invention, the signal transmission circuit 41 includes a third diode, a fourth diode, a fifth resistor, and a sixth resistor; the positive terminal of the third diode is connected to the sensing signal output terminal of the sensing module 3, and the negative terminal is connected to the input terminal of the signal selection circuit 42 via the fifth resistor; the positive terminal of the fourth diode is connected to the strong start signal output terminal, and the negative terminal is connected to the input terminal of the signal selection circuit 42 via the sixth resistor.

[0038] Specifically, referring to Figures 1 and 2, in this embodiment, the third diode D1 and the fourth diode D2 are reverse-biased diodes. The anode of the third diode D1 is connected to the sensing signal output terminal of the sensing module 3, and the cathode is connected to the input terminal of the signal selection circuit 42 via the fifth resistor R1. The anode of the fourth diode D2 is connected to the strong start signal output terminal, and the cathode is connected to the input terminal of the signal selection circuit 42 via the sixth resistor R2. When the sensing signal or the strong start signal is high, the corresponding diode is forward-biased, allowing the signal to be transmitted to the input terminal of the signal selection circuit 42; when the signal is low, the diode is reverse-biased, blocking the reverse current path. The workflow is as follows: When the forced start signal is valid, the fourth diode D2 conducts, pulling the input voltage of the signal selection circuit 42 high through the sixth resistor R2. If the induced signal is low at this time, the third diode D1 is cut off, and the input of the signal selection circuit is controlled only by the forced start signal. If the induced signal is high at this time, since the forced start signal has already pulled the input voltage high, and the high-level voltage of the induced signal is the same as or close to the voltage of the forced start signal, there is no forward voltage difference across the third diode D1, and it is actually in the cutoff state. When the forced start signal is invalid, if the induced signal is high, the third diode D1 conducts, and the signal is transmitted to the input of the signal selection circuit through the fifth resistor R1, controlling the lamp to light up; if the induced signal is low, the third diode D1 is cut off, the input of the signal selection circuit is low, and the lamp is off. Understandably, this invention uses the unidirectional conduction characteristic of diodes to force the start signal to take precedence over the sensing signal, avoiding logic competition that could lead to lighting control conflicts. The diode-resistor logic circuit has no active power consumption, and the signal transmission delay depends only on the diode conduction time, ensuring real-time control. The fifth resistor R1 and the sixth resistor R2 limit the current and block reverse interference between the sensing module and the start module, preventing false triggering. When any signal source fails, the reverse cutoff characteristic of the diode can isolate the fault and prevent system paralysis. It is understood that those skilled in the art can make corresponding equivalent improvements based on the signal priority logic design of this utility model, depending on the application scenario. For example, the diode-resistor logic can be replaced with a digital OR gate chip. Based on the same signal priority principle, the strong start and sensing signals can be directly mixed through the OR gate to eliminate the influence of diode voltage drop, which is suitable for high-precision dimming control scenarios. Alternatively, based on the unidirectional signal transmission characteristics, the diode can be replaced with a MOSFET such as 2N7002, which utilizes its low on-resistance characteristics to build a low-loss signal path, suitable for high-current driving lamps. Or, based on the priority control logic, a microcontroller such as STM32G0 can be introduced to dynamically adjust the signal mixing strategy through software algorithms, supporting adaptive dimming and fault diagnosis, and suitable for smart home systems.

[0039] Preferably, in one embodiment of the present invention, the signal transmission circuit 41 further includes a filtering circuit, which includes a seventh resistor and a second capacitor; the seventh resistor and the second capacitor are connected in parallel between the output terminal of the signal transmission circuit 41 and ground to form an RC filter network to filter out signal noise.

[0040] Specifically, referring to Figures 1 and 2, in this embodiment, the filter circuit at the output of the signal transmission circuit 41 consists of a seventh resistor R3 and a second capacitor C1. The seventh resistor R3 and the second capacitor C1 are connected in parallel between the output of the signal transmission circuit 41 and ground, forming an RC filter network to filter out signal noise. It is understood that the RC filter network can effectively filter out high-frequency interference in the signal and reduce the false trigger rate. Based on the filter circuit design of this utility model, those skilled in the art can make corresponding equivalent improvements according to the application scenario, such as adjusting the capacitance / resistance value for different noise frequency characteristics, replacing the first capacitor C2 with a low-ESR ceramic capacitor to improve high-frequency filtering performance, using a tantalum capacitor to enhance low-frequency noise suppression, or using other types of filter circuits according to the application scenario: RC filtering is low-cost and simple in structure, suitable for noise suppression in general scenarios; LC filtering has excellent high-frequency suppression and is suitable for industrial environments with strong interference; π-type filtering balances cost and effect, and strengthens the filtering of mid- and low-frequency noise.

[0041] Preferably, in one embodiment of the present invention, the signal selection circuit 42 includes a first transistor, the base of the first transistor is connected to the output terminal of the signal transmission circuit 41, the collector is connected to the DC output terminal of the power supply module 1, and the emitter outputs a dimming control signal to the dimming drive module 5.

[0042] Specifically, referring to Figures 1 and 2, in this embodiment, the first transistor Q1 is an NPN transistor. Its base is connected to the output terminal of the signal transmission circuit 41, its collector is connected to the DC output terminal of the power supply module 1, and its emitter outputs a dimming control signal to the dimming drive module 5. When the forced start signal is valid, the signal transmission circuit 41 outputs a high level, for example, a voltage of 3.3 volts. The base voltage of the first transistor Q1 exceeds its conduction threshold of 0.7 volts, and the first transistor Q1 enters a saturated conduction state. At this time, the emitter voltage is approximately the DC voltage of the power supply minus 0.7 volts. In this embodiment, the power supply voltage is 5 volts, so the emitter outputs a high-level dimming signal of approximately 4.3 volts, driving the lamp into a constant-on mode. When the forced start is invalid, when the signal transmission circuit 41 outputs a low-level signal, the base voltage of the first transistor Q1 is lower than the conduction threshold, and the first transistor Q1 is in a cutoff state. At this time, the emitter voltage is close to zero volts, and the dimming signal is determined by the control signal output by the sensing module. The lamp automatically turns on and off according to the environmental detection results. Understandably, this invention uses a first transistor Q1 to drive signal switching via current, exhibiting strong resistance to voltage fluctuations and preventing false triggering. The transistor's on / off action is completed within nanoseconds, ensuring real-time control of the lighting fixture. Only a single transistor is required to complete the function, resulting in a simple hardware structure suitable for mass production. When the transistor is off, the power supply and load paths are completely disconnected, preventing abnormal interference from the sensing module with the dimming signal. Those skilled in the art can make corresponding equivalent improvements based on the filter circuit design of this invention, depending on the application scenario. For example, replacing the transistor with an N-channel MOSFET and using gate voltage to control conduction reduces power loss and is suitable for high-current drive scenarios; or using a digital OR gate chip to directly mix the start-up and sensing signals, outputting a dimming control signal without attenuation.

[0043] Preferably, in one embodiment of the present invention, the signal selection circuit 42 further includes an eighth resistor, through which the emitter of the first transistor is grounded.

[0044] Understandably, the value of the eighth resistor R4 can be adjusted according to the power supply voltage or load requirements to limit the emitter current when the transistor is turned on, prevent overcurrent damage to the device, and extend the circuit life. When the first transistor Q1 is turned off, the eighth resistor R4 eliminates the floating emitter state, ensuring a clear low level output and avoiding false triggering.

[0045] Preferably, in one embodiment of the present invention, the power supply module 1 includes a high-voltage DC circuit 11 and a low-voltage DC circuit 12; the high-voltage DC circuit 11 is used to convert AC mains power into high-voltage DC power to supply power to the dimming drive module 5; the low-voltage DC circuit 12 includes a step-down constant voltage chip, used to convert the high-voltage DC power into low-voltage DC power to supply power to the sensing module 3, the start-up module 2 and the signal mixing module 4.

[0046] Specifically, referring to Figure 1, in this embodiment, the high-voltage DC circuit 11 includes a rectifier bridge DB1. The input terminal of the rectifier bridge DB1 is connected to the live wire and neutral wire of the mains power supply, converting 220V AC power into high-voltage DC power, such as 310V. The specific value is set according to the actual application scenario, powering the dimming drive module 5. The low-voltage DC circuit 12 includes a step-down chip U2, model BP8521, whose input terminal is connected to the output terminal of the high-voltage DC circuit 11, converting the 310V high-voltage DC power into 5V low-voltage DC power, which is output to the VCC input terminal of the sensing module 3, the forced start module 2, and the signal mixing module 4. It is understood that the high-voltage and low-voltage circuits are completely separated to prevent high-voltage electricity from entering the control circuit, ensuring user operation safety and improving component reliability. It should be noted that the component selection, parameters, and connection methods of the high-voltage DC circuit and the low-voltage DC circuit can be adjusted according to the actual application scenario. The following is a feasible embodiment:

[0047] The high-voltage DC circuit 11 is as follows: The mains live wire L is connected in series with fuse F1 and varistor RV1, then connected to pin 3 of rectifier bridge DB1; the mains neutral wire N is connected to the other end of varistor RV1 and pin 1 of rectifier bridge DB1; varistor RV1 is connected in parallel between L and N to suppress mains surge voltage; pin 4 of rectifier bridge DB1 is grounded, and pin 2 of the positive output terminal is connected to the HV pin of dimming driver chip U3 through current-limiting resistor R10. The dimming driver chip U3 is model IC-BP2956; an electrolytic capacitor EC1 is connected in parallel between pin 2 of rectifier bridge DB1 and ground to filter out high-frequency ripple after rectification; pin 2 of rectifier bridge DB1 is also connected to the negative terminal of diode D5 and the positive terminal LED+ of the LED string. The positive terminal of diode D5 is connected to the DRAIN pin of the dimming driver chip U3 and one end of the high-frequency transformer T1; the other end of the high-frequency transformer T1 is connected to the negative terminal LED- of the LED load; the GND pin of the dimming driver chip U3 is grounded, and the ROVP pin is grounded through resistor R12 to set the overvoltage protection threshold; the CS pin of the dimming driver chip U3 is grounded through parallel resistors R13 and R14 to achieve current sampling and overcurrent protection; the DRAIN pin of the dimming driver chip U3 outputs a drive signal to the high-frequency transformer T1, and generates low-voltage DC through the coupling effect of T1; a parallel resistor R17 and an electrolytic capacitor EC3 are connected between LED+ and LED- of the LED load to form a load filtering and discharge circuit to prevent voltage surges from damaging the LED light source.

[0048] The low-voltage DC circuit 12 is as follows: The low-voltage converter chip U2 is model BP8521; the DRAIN pin of the low-voltage converter chip U2 is connected to pin 2 of DB1, the GND pin is grounded, and the IC_GND pin is connected to one end of inductor L1 and one end of resistor R11; the other end of resistor R11 is connected to the VFB pin of the low-voltage converter chip U2 for feedback voltage regulation; the VOUT pin of the low-voltage converter chip U2 is connected to the other end of inductor L1 through resistor R15, and is connected in parallel with electrolytic capacitor EC2 to form an LC filter network, outputting a stable 5V low-voltage DC power; the 5V output terminal VCC is connected to the power input terminal pin 2 of the sensing module 3; pin 1 of the sensing module 3 is grounded, pin 3 outputs the sensing control signal, and resistor R16 and electrolytic capacitor EC2 are connected in parallel between pin 2 and ground to further filter out power supply noise.

[0049] Detailed workflow description: The 220V AC mains power, after surge suppression by fuse F1 and varistor RV1, is rectified into pulsating DC by rectifier bridge DB1. This DC is then filtered by electrolytic capacitor EC1 to generate approximately 310V high-voltage DC. Dimming driver chip U3 converts this into LED driving current via high-frequency transformer T1, and stabilizes the load voltage through resistor R17 and electrolytic capacitor EC3. Simultaneously, the induced voltage on the secondary winding of high-frequency transformer T1 is converted into 5V low-voltage DC by a circuit consisting of step-down chip U2, inductor L1, and electrolytic capacitor EC2, powering the sensing module, start-up module, and signal mixing module. A filter circuit composed of resistor R16 and electrolytic capacitor EC2 suppresses power supply noise, ensuring signal purity. Those skilled in the art can make equivalent improvements to the above circuit according to actual needs, such as adjusting filter parameters, replacing the core chip, or integrating additional functional modules, without departing from the core design concept of this utility model.

[0050] This invention proposes an inductive forced-start light control circuit. The forced-start module completely isolates the high-voltage mains power from the low-voltage control circuit through an electrical isolation unit, avoiding component damage or electric shock risks caused by high-voltage intrusion. At the same time, it suppresses the influence of electromagnetic interference on signal transmission, ensuring long-term stable operation of the system. The signal mixing module achieves seamless switching between forced start and inductive control through priority logic that prioritizes the forced-start signal. Users can manually trigger the lamp to stay on to meet special needs, while automatically reverting to inductive mode during daily use, balancing flexibility and energy saving goals. In inductive mode, the lamp only lights up when it detects human activity or environmental triggering, reducing ineffective energy consumption. The forced-start mode directly controls the dimming drive module through a high-level signal, avoiding lighting interruptions caused by sensor failure or insufficient environmental signals. Furthermore, by preferably using an optocoupler as the electrical isolation unit and employing a voltage divider network composed of a first resistor, a second resistor, and a third resistor, precise voltage division between the mains high voltage and the optocoupler input is achieved. Through the coordinated design of the first and second diodes, a two-phase voltage protection system is constructed, ensuring reliable triggering of the forced start function and achieving full-cycle adaptability to complex mains operating conditions. An RC filter circuit is set at the output of the electrical isolation unit to suppress noise, improving signal reliability in complex environments. The third and fourth diodes in the signal transmission circuit 41 utilize the unidirectional conduction characteristics of diodes to ensure that the forced start signal takes precedence over the sensing signal, avoiding logic competition that could lead to lighting control conflicts. Simultaneously, the diode conduction time is several... This invention provides a block that ensures real-time control and isolates the impact of any signal source failure to prevent system paralysis. An RC filter circuit at the signal transmission circuit output suppresses noise, improving signal reliability in complex environments. The signal selection circuit uses a first transistor to drive signal switching via current, exhibiting strong resistance to voltage fluctuations and preventing false triggering. The transistor's on / off action is completed within nanoseconds, enhancing the real-time performance of lighting control. A high-voltage DC circuit powers the dimming drive module and LED load, while a low-voltage DC circuit powers the sensing module, forced-start module, and signal mixing module. Combined with the synergistic effect of the transformer and electrical isolation unit, this effectively blocks interference from the high-voltage circuit to the low-voltage control circuit. In summary, this invention solves the technical problems of low safety, signal interference, and integration difficulties in existing inductive forced-start light control technologies.

[0051] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A sensor-activated strong light control circuit, characterized in that, include: The power module (1) is connected to AC power at the input end and outputs DC power at the output end. The forced start module (2) includes a trigger switch and an electrical isolation unit connected in series on the mains L line. The electrical isolation unit isolates the mains high voltage and low voltage control circuits and generates a forced start signal at the output end. The sensing module (3) generates a sensing control signal based on environmental detection. The signal mixing module (4) includes a signal transmission circuit (41) and a signal selection circuit (42). The first input end of the signal transmission circuit (41) is connected to the output end of the electrical isolation unit, the second input end is connected to the output end of the sensing module (3), and the output end is connected to the input end of the signal selection circuit (42). The signal selection circuit (42) outputs a high-level dimming control signal when the forced start signal is valid and outputs a sensing control signal as a dimming control signal when the forced start signal is invalid. The dimming drive module (5) drives the light source according to the dimming control signal.

2. The induction-activated light control circuit as described in claim 1, characterized in that, The electrical isolation unit is an optocoupler, and its input terminal is connected to the trigger switch via a resistor network.

3. The induction-activated light control circuit as described in claim 2, characterized in that, The resistor network includes a first resistor, a second resistor, and a third resistor; one end of the first resistor is connected to the trigger switch, and the other end is connected to one end of the second resistor and the first input terminal of the optocoupler; one end of the third resistor is connected to the neutral (N) line of the mains, and the other end is connected to the other end of the second resistor and the second input terminal of the optocoupler.

4. The induction-activated light control circuit as described in claim 3, characterized in that, The forced start module (2) further includes a first diode and a second diode for suppressing reverse voltage surges; the positive terminal of the first diode is connected to the trigger switch, and the negative terminal is connected to the first resistor; the positive terminal of the second diode is connected to the second input terminal of the optocoupler, and the negative terminal is connected to the first input terminal of the optocoupler.

5. The inductive strong light control circuit as described in claim 2, characterized in that, The output terminal of the optocoupler is provided with a filter circuit, including a first capacitor and a fourth resistor; one end of the first capacitor is connected to the first output terminal of the optocoupler, and the other end, together with the second output terminal of the optocoupler and one end of the fourth resistor, is connected to the strong start signal output terminal, and the other end of the fourth resistor is grounded.

6. The inductive strong light control circuit as described in claim 1, characterized in that, The signal transmission circuit (41) includes a third diode, a fourth diode, a fifth resistor, and a sixth resistor; the positive terminal of the third diode is connected to the sensing signal output terminal of the sensing module (3), and the negative terminal is connected to the input terminal of the signal selection circuit (42) via the fifth resistor; the positive terminal of the fourth diode is connected to the strong start signal output terminal, and the negative terminal is connected to the input terminal of the signal selection circuit (42) via the sixth resistor.

7. The inductive strong light control circuit as described in claim 6, characterized in that, The signal transmission circuit (41) further includes a filtering circuit, which includes a seventh resistor and a second capacitor. The seventh resistor and the second capacitor are connected in parallel between the output terminal of the signal transmission circuit (41) and ground to form an RC filter network to filter out signal noise.

8. The induction-activated light control circuit as described in claim 1, characterized in that, The signal selection circuit (42) includes a first transistor, the base of which is connected to the output terminal of the signal transmission circuit (41), the collector of which is connected to the DC output terminal of the power supply module (1), and the emitter outputs a dimming control signal to the dimming drive module (5).

9. The inductive strong light control circuit as described in claim 8, characterized in that, The signal selection circuit (42) also includes an eighth resistor, through which the emitter of the first transistor is grounded.

10. The inductive strong light control circuit as described in claim 1, characterized in that, The power supply module (1) includes a high-voltage DC circuit (11) and a low-voltage DC circuit (12); the high-voltage DC circuit (11) is used to convert AC mains power into high-voltage DC power to supply power to the dimming drive module (5); the low-voltage DC circuit (12) includes a step-down constant voltage chip, which is used to convert the high-voltage DC power into low-voltage DC power to supply power to the sensing module (3), the start-up module (2) and the signal mixing module (4).

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