Energy-saving LED floodlight controller

Abstract

This utility model relates to the field of lighting control technology. To address the technical problem of existing LED floodlights lacking responsiveness to changes in ambient light intensity, this utility model discloses an energy-saving LED floodlight controller. It includes a light control circuit for the control power supply circuit. The light control circuit consists of a light detection circuit, a delay circuit, and a drive circuit. The light detection circuit uses a photoresistor, resistor, and capacitor to form a differentiating circuit, capable of capturing sudden changes in ambient light in real time. The delay circuit consists of NAND gate logic devices, capacitors, and resistors. Upon detecting a sudden dimming signal, it outputs a drive signal. The drive circuit controls a relay via a transistor, automatically turning on the LED floodlight. This controller has a simple structure, sensitive response, and good anti-interference and false triggering suppression capabilities. It can intelligently control the lighting status according to changes in ambient light intensity, effectively reducing energy consumption while ensuring emergency lighting needs, and improving the intelligence and convenience of the lighting system.

Description

Technical Field

[0001] This utility model relates to the field of lighting control technology, and in particular to an energy-saving LED floodlight controller. Background Technology

[0002] With the rapid development of LED lighting technology, LED floodlights can provide brighter and stronger light to ensure the safety of outdoor spaces. Due to their advantages, LED floodlights are widely used in outdoor lighting and play a vital role in our lives; their value is often more apparent during power outages.

[0003] However, in practical applications, existing LED floodlights generally suffer from the following problems:

[0004] Existing LED floodlights lack the ability to intelligently respond to changes in ambient light intensity. They cannot automatically adjust their lighting status according to changes in the surrounding light intensity, resulting in frequent energy waste or insufficient lighting.

[0005] Although some LED lighting devices with light control functions can achieve a certain degree of automatic control, they have complex structures, slow control circuit response speed, high false trigger rate, and are prone to malfunction when the ambient light changes suddenly, affecting the user experience.

[0006] Therefore, there is an urgent need for an energy-saving LED floodlight controller that is simple in structure, sensitive in control, has a delay function, and can automatically adjust its operation according to changes in ambient light, in order to solve the above problems. Utility Model Content

[0007] The purpose of this invention is to provide an energy-saving LED floodlight controller to solve the technical problem that existing LED floodlights lack the ability to respond to changes in ambient light intensity.

[0008] To achieve the above objectives, the specific technical solution of the energy-saving LED floodlight controller of this utility model is as follows:

[0009] An energy-saving LED floodlight controller includes a power supply circuit, which comprises a relay K, a transformer T6, and a transistor Q6 for self-oscillation. It also includes a light control circuit that controls the power supply circuit. The light control circuit consists of a light detection circuit, a delay circuit, and a drive circuit. A photoresistor R38 and a resistor R39 are connected in series. The lower end of photoresistor R38 is grounded, and the upper end of resistor R39 is connected to the second switching terminal of relay K. The series connection point of photoresistor R38 and resistor R39 is further grounded through capacitor C26 and resistor R40 in sequence. This forms a differentiable circuit structure that can effectively extract transient voltage signals caused by changes in illumination. The delay circuit includes NAND gates U2, U3, and U4, as well as capacitor C27 and resistor R41. The two input terminals of NAND gate U4 are connected to the common node of capacitor C26 and resistor R40. The output terminal of NAND gate U4 is connected to the second input terminal of NAND gate U2, and the output terminal of NAND gate U2 is connected to the two input terminals of NAND gate U3 through capacitor C27. The first input terminal of NAND gate U2 and the output terminal of NAND gate U3 are connected in a closed loop. The two input terminals of NAND gate U3 are also grounded through resistor R41.

[0010] Furthermore, the driving circuit consists of a current-limiting resistor R42, a PNP transistor Q7, and a relay K. The output of the NAND gate U3 is connected to the base of the transistor Q7 via the current-limiting resistor R42. The emitter of the transistor Q7 is connected to the upper end of the resistor R39, i.e., the positive terminal of the power supply. The collector is connected to one end of the coil of the relay K, and the other end of the coil is grounded. A protective diode D20 is connected in parallel with this coil. The anode of the diode D20 is grounded, and the cathode of the diode D20 is connected to the collector of the transistor Q7. The current-limiting resistor provides current-limiting protection for the driving signal. The transistor Q7 acts as a switching device to effectively control the relay K. When the delay circuit outputs a low level, the transistor conducts, driving the relay to engage and controlling the LED floodlight. The diode D20 connected in parallel with the relay coil effectively absorbs the reverse electromotive force generated by the inductive load, preventing breakdown of the transistor, improving the overall anti-interference capability and stability, and extending the life of the device.

[0011] Furthermore, the transformer T6 is equipped with a first coil, a second coil, and a third coil. The two ports of the first coil are defined as terminals 1 and 2, the two ports of the second coil are defined as terminals 5 and 6, and the two ports of the third coil are defined as terminals 3 and 4. The transistor Q6 is a PNP type, with its emitter connected to terminal 6, its collector grounded, and its base connected to terminal 2. Terminal 1 is grounded through capacitor C24, and terminal 5 is connected to terminal 3 of the selector switch S1 for power input. Terminal 5 is also connected to the first switching terminal of relay K, and the second switching terminal of relay K is connected to the emitter of transistor Q7 and simultaneously connected to the positive terminal of battery BAT1. This power supply section uses a transformer T6 with multiple coils, enabling multi-channel voltage output and isolation. Structurally, power conversion is achieved through self-excited oscillation. Transistor Q6 and the transformer coils form a simple and efficient oscillation circuit, reducing costs and facilitating miniaturization design. The first switch terminal of the relay is connected to the second coil to realize the main circuit control. At the same time, combined with the external battery BAT1 as a backup power source, it can effectively ensure that the system can still respond normally when there is an external power failure or sudden environmental changes, ensuring that the LED floodlight can be lit at critical moments, thereby improving safety assurance capabilities and emergency reliability.

[0012] The energy-saving LED floodlight controller provided by this utility model has the following advantages:

[0013] This invention introduces a light control circuit consisting of a light detection circuit, a delay circuit, and a drive circuit into an LED floodlight. This circuit enables intelligent response based on changes in ambient light intensity. In particular, the differential circuit composed of a photoresistor, capacitor, and resistor promptly captures sudden changes in light intensity signals, and the delay control module composed of NAND gate logic circuits outputs a drive signal for a set time. This allows the LED floodlight to automatically turn on when encountering a sudden dark environment and automatically turn off when continuous lighting is not required. This effectively avoids energy waste caused by continuous lighting and improves the intelligence level and ease of use of the lighting system. Attached Figure Description

[0014] Figure 1 The power supply circuit diagram provided for this utility model;

[0015] Figure 2 The light control circuit diagram provided for this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0017] See Figure 1 and Figure 2 The energy-saving LED floodlight controller provided by this utility model includes a power supply circuit and a light control circuit. The power supply circuit includes a transformer T6, which is provided with a first coil, a second coil and a third coil. The two ports of the first coil are defined as terminal 1 and terminal 2, the two ports of the second coil are defined as terminal 5 and terminal 6, and the two ports of the third coil are defined as terminal 3 and terminal 4. A PNP transistor Q6 is provided to generate self-excited oscillation. The emitter of transistor Q6 is connected to terminal 6, the collector of transistor Q6 is grounded, the base of transistor Q6 is connected to terminal 2, terminal 1 is grounded through capacitor C24, and terminal 5 is connected to terminal 3 of selector switch S1 for power input.

[0018] Terminal 5 is also connected to the first switching terminal of relay K, the second switching terminal of relay K is connected to the emitter of transistor Q7, and is also connected to the positive terminal of battery BAT1.

[0019] The light control circuit includes a light detection circuit, a delay circuit, and a drive circuit.

[0020] The light detection circuit consists of a photoresistor R38, a resistor R39, a capacitor C26, and a resistor R40, and is used to detect sudden changes in the intensity of ambient light. Specifically, photoresistor R38 and resistor R39 are connected in series, with the lower end of photoresistor R38 grounded and the upper end of resistor R39 connected to the second switching terminal of relay K. The series connection of photoresistor R38 and resistor R39 is further grounded through capacitor C26 and resistor R40 in sequence, forming a differentiating circuit structure that can effectively extract transient voltage signals caused by changes in light intensity.

[0021] The delay circuit includes three NAND gates U2, U3, and U4, as well as capacitor C27 and resistor R41. Its delay time can be adjusted by modifying the parameters of capacitor C27 and resistor R41. The two inputs of NAND gate U4 are connected to the common node of the output of the differentiating circuit (capacitor C26 and resistor R40) to receive the voltage signal caused by sudden changes in ambient light. The output of NAND gate U4 is connected to the second input of NAND gate U2, and the output of NAND gate U2 is connected to the two inputs of NAND gate U3 through capacitor C27. The first input of NAND gate U2 and the output of NAND gate U3 are connected in a closed loop. The two inputs of NAND gate U3 are also grounded through resistor R41. This structure ensures a stable output signal after a valid trigger signal is received.

[0022] The driving circuit consists of a current-limiting resistor R42, a PNP transistor Q7, and a relay K. The output of the NAND gate U3 is connected to the base of the transistor Q7 via the current-limiting resistor R42. The emitter of the transistor Q7 is connected to the upper end of the resistor R39, i.e., the positive terminal of the power supply. The collector is connected to one end of the coil of the relay K, and the other end of the coil is grounded. A protective diode D20 is connected in parallel with this coil; its anode is grounded, and its cathode is connected to the collector of the transistor Q7. When the delay circuit outputs a low level, the transistor Q7 conducts, the relay K is energized, and the LED floodlight contact K-1 is closed, thus lighting the LED.

[0023] When the external light suddenly increases, the resistance of the photoresistor R38 drops rapidly, forming a negative jump voltage across its terminals. This voltage, through the differential capacitor C26, acts on the resistor R40 to generate a negative pulse. The input of the NAND gate U4 is low, the logic state of the delay circuit remains unchanged, and the LED does not light up.

[0024] When the external light suddenly weakens (such as when it is blocked by dark clouds), the resistance of the photoresistor R38 rises rapidly, generating a positive jump voltage across its terminals. The differentiating circuit outputs a positive pulse, which in turn drives the transistor Q7 to conduct, and the relay K to engage, thus providing illumination.

[0025] In the preferred configuration, the photoresistor R38 is an MG45 type, and the transistor Q7 is a 9012 type PNP transistor. The relay K is a 12V single-contact relay with a minimum allowable contact current of 1A. The differential capacitor C26 is recommended to have a capacitance in the range of 500–1000pF to avoid false triggering. The lighting duration of the LED floodlight can be flexibly set by adjusting the capacitor C27 and resistor R41 in the delay circuit.

[0026] The energy-saving LED floodlight controller provided by this utility model introduces a light control circuit composed of a light detection circuit, a delay circuit, and a drive circuit into the LED floodlight. It can achieve intelligent response according to changes in ambient light intensity. In particular, the differential circuit composed of a photoresistor, capacitor, and resistor promptly captures sudden changes in light intensity signals, and the delay control module composed of NAND gate logic circuits outputs a drive signal for a set time. This allows the LED floodlight to automatically turn on after a delay when encountering a dark environment and automatically turn off when continuous lighting is not needed. This effectively avoids energy waste caused by continuous lighting, improves the intelligence level and ease of use of the lighting system, and the system has a simple structure, sensitive response, and low false trigger rate. It is particularly suitable for outdoor lighting scenarios with high requirements for changes in ambient light, and effectively solves the problems of existing LED floodlights lacking ambient light response capability, poor automatic control effect, and high energy consumption.

[0027] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An energy-saving LED floodlight controller, comprising a power supply circuit, wherein the power supply circuit includes a relay K, a transformer T6, and a transistor Q6 for self-oscillation, characterized in that, A light control circuit is also provided to control the power supply circuit. This light control circuit consists of a light detection circuit, a delay circuit, and a drive circuit. A photoresistor R38 and a resistor R39 are connected in series. The lower end of photoresistor R38 is grounded, and the upper end of resistor R39 is connected to the second switching terminal of relay K. The series connection point of photoresistor R38 and resistor R39 is further grounded through capacitor C26 and resistor R40, forming a differentiating circuit structure that can effectively extract transient voltage signals caused by changes in illumination. The delay circuit... The system includes NAND gates U2, U3, and U4, as well as capacitor C27 and resistor R41. The two inputs of NAND gate U4 are connected to the common node of capacitor C26 and resistor R40. The output of NAND gate U4 is connected to the second input of NAND gate U2. The output of NAND gate U2 is connected to the two inputs of NAND gate U3 through capacitor C27. The first input of NAND gate U2 and the output of NAND gate U3 are connected in a closed loop. The two inputs of NAND gate U3 are also grounded through resistor R41.

2. The energy-saving LED floodlight controller according to claim 1, characterized in that, The driving circuit consists of a current-limiting resistor R42, a PNP transistor Q7, and a relay K. The output of the NAND gate U3 is connected to the base of the transistor Q7 via the current-limiting resistor R42. The emitter of the transistor Q7 is connected to the upper end of the resistor R39, which is the positive terminal of the power supply. The collector is connected to one end of the coil of the relay K, and the other end of the coil is grounded. A protective diode D20 is connected in parallel with the coil. The anode of the diode D20 is grounded, and the cathode of the diode D20 is connected to the collector of the transistor Q7.

3. The energy-saving LED floodlight controller according to claim 2, characterized in that, The transformer T6 is equipped with a first coil, a second coil, and a third coil. The two ports of the first coil are defined as terminal 1 and terminal 2, the two ports of the second coil are defined as terminal 5 and terminal 6, and the two ports of the third coil are defined as terminal 3 and terminal 4. Transistor Q6 is a PNP type. The emitter of transistor Q6 is connected to terminal 6, the collector of transistor Q6 is grounded, and the base of transistor Q6 is connected to terminal 2. Terminal 1 is grounded through capacitor C24. Terminal 5 is connected to terminal 3 of selector switch S1 for power input. Terminal 5 is also connected to the first switching terminal of relay K. The second switching terminal of relay K is connected to the emitter of transistor Q7 and simultaneously connected to the positive terminal of battery BAT1.

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