LED emergency lamp control circuit
By designing the LED emergency light control circuit and using the coordinated work of multiple modules, the lighting brightness is automatically adjusted according to the lighting conditions, solving the problem of high energy loss when the LED emergency lights are sufficient in the prior art, and improving the intelligence level and working efficiency of the equipment.
Patent Information
- Application Number
- CN202422190911.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-06
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-09-06
AI Technical Summary
When existing LED emergency lights lose power when they are displayed under sufficient lighting, they can easily cause unnecessary energy losses and cannot automatically adjust the lighting brightness according to functional requirements.
An LED emergency light control circuit is designed, including a power control module, a power down detection module, a charge and discharge control module, a light detection module, a constant current driving module and an LED control module. Through the coordinated work of these modules, the function of automatically adjusting the lighting brightness according to the lighting conditions and reducing energy losses is realized.
It realizes reducing power loss when there is sufficient light, while meeting the needs of power loss display, increasing lighting brightness when there is no light, and improving the intelligence and working efficiency of LED emergency lights.
Smart Images
Figure CN223007680U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of emergency lights, in particular to an LED emergency light control circuit. Background Technique
[0002] The LED emergency light is built-in with a power supply. When the lighting power supply is cut off or the power grid loses power, it conducts emergency lighting and is commonly used in factories, mines, government agencies, schools, buildings and tunnels. In the prior art, the LED emergency light generally conducts emergency lighting work when the lighting power supply is cut off or the power grid loses power, which can not only provide bright light but also give a power failure prompt. However, since it cannot automatically adjust the lighting brightness according to the required functional requirements, when the LED emergency light conducts a power failure display under sufficient light, it is likely to cause unnecessary energy consumption. Therefore, it needs to be improved. Content of the Utility Model
[0003] The embodiment of the utility model provides an LED emergency light control circuit to solve the problems put forward in the above background technique.
[0004] To achieve the above object, the utility model provides the following technical solutions:
[0005] An LED emergency light control circuit includes: a power supply control module, a power failure detection module, a charge and discharge control module, a light detection module, a constant current drive module and an LED control module;
[0006] The power supply control module is connected to the light detection module, the charge and discharge control module and the constant current drive module, and is used for accessing AC electric energy, performing step-down, rectification and filtering processing on the AC electric energy, outputting first electric energy, and transmitting the first electric energy to the light detection module, the charge and discharge control module and the constant current drive module;
[0007] The power failure detection module is connected to the power supply control module, and is used for detecting power failure of the power supply control module and outputting a first control signal when the power supply control module does not access AC electric energy;
[0008] The charge and discharge control module is connected to the power failure detection module, and is used for performing voltage stabilization and filtering processing on the first electric energy and storing the processed electric energy, and outputting second electric energy when receiving the first control signal;
[0009] The light detection module is connected to the charge and discharge control module, and is used for receiving the first electric energy or the second electric energy and performing light detection, and outputting a second control signal when the detected signal is lower than the set low light threshold;
[0010] The constant current drive module is connected to the charge and discharge control module, and is used for performing current sampling, performing constant current and voltage stabilization processing on the received first electric energy or second electric energy, and outputting third electric energy;
[0011] The LED control module is connected to the constant current drive module and the light detection module, and is used to receive the third electric energy and perform power-off display work. When receiving the third electric energy and the second control signal, it performs lighting work.
[0012] As a further solution of the present utility model: The power supply control module includes a power supply interface, a first transformer, a first rectifier, a first diode, a first capacitor and a first key switch; the power-off detection module includes a first resistor, a second resistor, a first power supply and a first optocoupler;
[0013] Preferably, the first end and the second end of the power supply interface are respectively connected to the first end and the second end of the primary side of the first transformer. The first end of the secondary side of the first transformer is connected to the first end of the first rectifier and is connected to the first end of the first optocoupler through the first resistor. The second end of the secondary side of the first transformer is connected to the second end of the first rectifier and the second end of the first optocoupler. The third end of the first optocoupler is connected to the charge and discharge control module and is connected to the first power supply through the second resistor. The fourth end of the first optocoupler is grounded. The third end of the first rectifier is connected to the anode of the first diode and the first end of the first capacitor. The second end of the first capacitor and the fourth end of the first rectifier are both grounded. The cathode of the first diode is connected to the moving end of the first key switch, and the static end of the first key switch is connected to the light detection module.
[0014] As a further solution of the present utility model: The charge and discharge control module includes a first voltage regulator, a first potentiometer, a third resistor, a second capacitor, a first power transistor, a second diode and a backup power supply;
[0015] Preferably, the third end of the first voltage regulator is connected to the first end of the first capacitor. The second end of the first voltage regulator is connected to one end of the backup power supply, the drain of the first power transistor and one end of the second capacitor, and is connected to one end of the first potentiometer and the first end of the first voltage regulator through the third resistor. The source of the first power transistor is connected to the anode of the second diode. The cathode of the second diode is connected to the static end of the first key switch. The gate of the first power transistor is connected to the third end of the first optocoupler. The other end and the sliding end of the first potentiometer are both grounded. The other end of the second capacitor and the other end of the backup power supply are both grounded.
[0016] As a further solution of the present utility model: The constant current drive module includes a fourth resistor, a fifth resistor, a third diode, a first driver, a sixth resistor, a seventh resistor, a second power transistor, a fourth diode, a third capacitor and a first inductor;
[0017] Preferably, the eighth terminal and the sixth terminal of the first driver are both connected to the cathode of the third diode, one end of the third capacitor, and the static terminal of the first key switch, and are connected to one end of the fifth resistor, the cathode of the fourth diode, and the first terminal of the first driver through the fourth resistor. The fifth terminal of the first driver is connected to the gate of the second power transistor. The drain of the second power transistor is connected to the anode of the third diode, the other end of the third capacitor, and the first end of the first inductor. The source of the second power transistor is connected to the third terminal of the first driver and grounded through the seventh resistor. The second terminal of the first driver is grounded through the sixth resistor. The anode of the fourth diode, the other end of the fifth resistor, the fourth terminal and the seventh terminal of the first driver are all grounded. The second end of the first inductor is connected to the LED control module.
[0018] As a further solution of the present invention: The LED control module includes a first LED, a second LED, a third LED, and a third power transistor;
[0019] Preferably, the first end of the first LED is connected to the first end of the second LED, the first end of the third LED, and the cathode of the third diode. The second end of the first LED is connected to the second end of the first inductor and the source of the third power transistor. The drain of the third power transistor is connected to the second end of the second LED and the second end of the third LED. The gate of the third power transistor is connected to the light detection module.
[0020] As a further solution of the present invention: The light detection module includes an eighth resistor, a first photosensitive resistor, a ninth resistor, a tenth resistor, and a first comparator;
[0021] Preferably, the non-inverting input terminal of the first comparator is connected to one end of the first photosensitive resistor and is connected to one end of the ninth resistor and the cathode of the second diode through the eighth resistor. The other end of the ninth resistor is connected to the inverting input terminal of the first comparator and is connected to the other end of the first photosensitive resistor and the ground terminal through the tenth resistor. The output terminal of the first comparator is connected to the gate of the third power transistor.
[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: The LED emergency light control circuit of the present invention performs AC-DC regulation processing by the power control module and stores energy by the charge and discharge control module. When the power-off detection module detects that the power control module loses power, it will control the charge and discharge control module to discharge. The released electric energy is subjected to constant current and voltage regulation processing by the constant current drive module and then powers the LED control module. The LED control module performs power-off display. At the same time, the light detection module detects the ambient light. When there is no light, the lighting brightness of the LED control module will be increased to control the LED control module to perform lighting work. When there is light, the power consumption is reduced and the power-off display is satisfied. When there is no light, lighting work is performed, improving the intelligence level and working efficiency of the LED emergency light. Description of the Drawings
[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0024] Figure 1 It is a schematic block diagram of the principle of an LED emergency light control circuit provided by an example of the present invention.
[0025] Figure 2 It is a circuit diagram of an LED emergency light control circuit provided by an example of the present invention.
[0026] Figure 3 It is a connection circuit diagram of the light detection module provided by an example of the present invention. Specific embodiments
[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0028] In one embodiment, please refer to Figure 1 , an LED emergency light control circuit includes: a power control module 1, a power-off detection module 2, a charge and discharge control module 3, a light detection module 4, a constant current drive module 5, and an LED control module 6;
[0029] Specifically, the power control module 1 is connected to the light detection module 4, the charge and discharge control module 3, and the constant current drive module 5, and is used to access AC power and perform step-down, rectification, and filtering processing on the AC power, output the first electric energy, and transmit the first electric energy to the light detection module 4, the charge and discharge control module 3, and the constant current drive module 5;
[0030] The power-off detection module 2 is connected to the power control module 1, and is used to detect the power-off of the power control module 1 and output a first control signal when the power control module 1 is not connected to AC power;
[0031] The charge and discharge control module 3 is connected to the power-off detection module 2, and is used to perform voltage stabilization and filtering processing on the first electric energy and store the processed electric energy, and output the second electric energy when receiving the first control signal;
[0032] The light detection module 4, connected to the charge and discharge control module 3, is configured to receive the first electric energy or the second electric energy and perform light detection. When the detected signal is lower than the set low light threshold, a second control signal is output;
[0033] The constant current drive module 5, connected to the charge and discharge control module 3, is configured to perform current sampling and perform constant current and voltage stabilization processing on the received first electric energy or second electric energy and output the third electric energy;
[0034] The LED control module 6, connected to the constant current drive module 5 and the light detection module 4, is configured to receive the third electric energy and perform power-off display work. When the third electric energy and the second control signal are received, lighting work is performed.
[0035] In a specific embodiment, the above power control module 1 can adopt a power control circuit composed of a power interface, a transformer, a rectifier, a key switch, etc., which can access AC electric energy and perform rectification and filtering processing on the AC electric energy, and control the transmission of electric energy; the above power-off detection module 2 can adopt a power-off detection circuit composed of an optocoupler, a resistor and a DC source, which can detect the state of the AC electric energy accessed by the power control module 1, and then perform power-off detection on the power control module 1; the above charge and discharge control module 3 can adopt a charge and discharge control circuit composed of a voltage regulator, a field effect transistor, a backup power supply, etc., which can perform voltage stabilization processing on the input electric energy, store the voltage-stabilized electric energy and release the stored electric energy; the above light detection module 4 can adopt a light detection circuit composed of a photosensitive resistor, a resistor and a comparator, which can perform light detection on the ambient light, set a low light threshold, and judge whether it is low light by judging the magnitude relationship between the detected signal and the low light threshold; the above constant current drive module 5 can adopt a constant current drive circuit composed of a driver, a resistor, a field effect transistor, an inductor, etc., which can perform current sampling on the LED control module 6 and perform constant current and voltage regulation processing on the input electric energy; the above LED control module 6 can adopt an LED control circuit composed of an LED lamp and a field effect transistor, which can perform lighting control and power-off display.
[0036] In another embodiment, please refer to Figure 1 、 Figure 2 and Figure 3 , the power control module 1 includes a power interface, a first transformer B1, a first rectifier T1, a first diode D1, a first capacitor C1 and a first key switch S1; the power-off detection module 2 includes a first resistor R1, a second resistor R2, a first power supply VCC1 and a first optocoupler J1;
[0037] Specifically, the first end and the second end of the power interface are respectively connected to the first end and the second end of the primary side of the first transformer B1. The first end of the secondary side of the first transformer B1 is connected to the first end of the first rectifier T1 and is connected to the first end of the first optocoupler J1 through the first resistor R1. The second end of the secondary side of the first transformer B1 is connected to the second end of the first rectifier T1 and the second end of the first optocoupler J1. The third end of the first optocoupler J1 is connected to the charge and discharge control module 3 and is connected to the first power supply VCC1 through the second resistor R2. The fourth end of the first optocoupler J1 is grounded. The third end of the first rectifier T1 is connected to the anode of the first diode D1 and the first end of the first capacitor C1. The second end of the first capacitor C1 and the fourth end of the first rectifier T1 are both grounded. The cathode of the first diode D1 is connected to the moving end of the first key switch S1, and the static end of the first key switch S1 is connected to the light detection module 4.
[0038] In a specific embodiment, the above-mentioned first key switch S1 can be a normally open switch; the above-mentioned first optocoupler J1 can be an EL814 optocoupler.
[0039] Further, the charge and discharge control module 3 includes a first voltage regulator IC1, a first potentiometer RP1, a third resistor R3, a second capacitor C2, a first power transistor Q1, a second diode D2, and a backup power supply;
[0040] Specifically, the third end of the first voltage regulator IC1 is connected to the first end of the first capacitor C1. The second end of the first voltage regulator IC1 is connected to one end of the backup power supply, the drain of the first power transistor Q1, and one end of the second capacitor C2 and is connected to one end of the first potentiometer RP1 and the first end of the first voltage regulator IC1 through the third resistor R3. The source of the first power transistor Q1 is connected to the anode of the second diode D2. The cathode of the second diode D2 is connected to the static end of the first key switch S1. The gate of the first power transistor Q1 is connected to the third end of the first optocoupler J1. The other end and the sliding end of the first potentiometer RP1 are both grounded. The other end of the second capacitor C2 and the other end of the backup power supply are both grounded.
[0041] In a specific embodiment, the above-mentioned first voltage regulator IC1 can be an LM317 voltage regulator; the above-mentioned first potentiometer RP1 adjusts the voltage output by the first voltage regulator IC1; the above-mentioned first power transistor Q1 can be an N-channel field effect transistor; the above-mentioned backup power supply can be a battery pack.
[0042] Further, the constant current drive module 5 includes a fourth resistor R4, a fifth resistor R5, a third diode D3, a first driver IC2, a sixth resistor R6, a seventh resistor R7, a second power transistor Q2, a fourth diode D4, a third capacitor C3, and a first inductor L1;
[0043] Specifically, the eighth terminal and the sixth terminal of the first driver IC2 are both connected to the cathode of the third diode D3, one end of the third capacitor C3, and the stationary terminal of the first push-button switch S1, and are connected to one end of the fifth resistor R5, the cathode of the fourth diode D4, and the first terminal of the first driver IC2 through the fourth resistor R4. The fifth terminal of the first driver IC2 is connected to the gate of the second power transistor Q2. The drain of the second power transistor Q2 is connected to the anode of the third diode D3, the other end of the third capacitor C3, and the first end of the first inductor L1. The source of the second power transistor Q2 is connected to the third terminal of the first driver IC2 and grounded through the seventh resistor R7. The second terminal of the first driver IC2 is grounded through the sixth resistor R6. The anode of the fourth diode D4, the other end of the fifth resistor R5, the fourth terminal and the seventh terminal of the first driver IC2 are all grounded. The second end of the first inductor L1 is connected to the LED control module 6.
[0044] In a specific embodiment, the first driver IC2 can be selected as the XLT604 chip; the second power transistor Q2 can be selected as an N-channel field effect transistor; the fourth resistor R4 and the fifth resistor R5 control the first driver IC2 to adjust the conduction degree of the second power transistor Q2, and then adjust the illumination brightness of the LED control module 6.
[0045] Further, the LED control module 6 includes a first LED, a second LED, a third LED, and a third power transistor Q3;
[0046] Specifically, the first end of the first LED is connected to the first end of the second LED, the first end of the third LED, and the cathode of the third diode D3. The second end of the first LED is connected to the second end of the first inductor L1 and the source of the third power transistor Q3. The drain of the third power transistor Q3 is connected to the second end of the second LED and the second end of the third LED. The gate of the third power transistor Q3 is connected to the light detection module 4.
[0047] In a specific embodiment, the third power transistor Q3 can be selected as an N-channel field effect transistor.
[0048] Further, the light detection module 4 includes an eighth resistor R8, a first photosensitive resistor RG1, a ninth resistor R9, a tenth resistor R10, and a first comparator A1;
[0049] Specifically, the non-inverting input terminal of the first comparator A1 is connected to one end of the first photosensitive resistor RG1 and connected to one end of the ninth resistor R9 and the cathode of the second diode D2 through the eighth resistor R8. The other end of the ninth resistor R9 is connected to the inverting input terminal of the first comparator A1 and connected to the other end of the first photosensitive resistor RG1 and the ground terminal through the tenth resistor R10. The output terminal of the first comparator A1 is connected to the gate of the third power transistor Q3.
[0050] In a specific embodiment, when there is no light, the above-mentioned first photosensitive resistor RG1 presents a high-resistance state, and when there is light, it presents a low-resistance state; the above-mentioned ninth resistor R9 and tenth resistor R10 provide a low-light threshold; the above-mentioned first comparator A1 can be selected as the LM358 comparator.
[0051] In a control circuit of an LED emergency lamp in this embodiment, AC power is accessed through a power interface, and a first transformer B1, a first rectifier T1, and a first capacitor C1 perform step-down and rectification filtering processing. A first voltage regulator IC1 cooperates with a first potentiometer RP1, a third resistor R3, and a second capacitor C2 for voltage regulation to provide charging power for a backup power supply. The backup power supply stores energy. When the AC power accessed through the power interface loses power, the first optocoupler J1 is cut off, and the first power supply VCC1 triggers the first power transistor Q1 to conduct through the second resistor R2. The backup power supply stops charging and releases the stored energy. The first driver IC2 controls the first LED lamp with constant current and voltage by adjusting the conduction degree of the second power transistor Q2. The first LED lamp performs power-off display. At the same time, the first photosensitive resistor RG1 detects light. When the detected signal is lower than the low-light threshold set by the ninth resistor R9 and the tenth resistor R10, the first comparator A1 outputs a high level and controls the third power transistor Q3 to conduct, so that the second LED lamp and the third LED lamp are both connected in parallel with the first LED lamp. The seventh resistor R7 samples the current, and the first driver IC2 controls the second power transistor Q2 to adjust the power of the electrical energy input to the LED control module 6, so that the first LED lamp, the second LED lamp, and the third LED lamp perform parallel lighting work. In addition, when the first button switch S1 is pressed, the electrical energy output by the power control module 1 can supply power to the first driver IC2, and then control the first LED lamp to display. In low light, the first LED lamp, the second LED lamp, and the third LED lamp perform parallel lighting.
[0052] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.
[0053] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A LED emergency light control circuit, characterized in that: The LED emergency light control circuit includes: a power supply control module, a power failure detection module, a charge and discharge control module, a light detection module, a constant current drive module and an LED control module; The power control module is connected to the light detection module, the charge and discharge control module and the constant current drive module, and is used to receive the AC power and perform voltage reduction, rectification and filtering on the AC power, output the first power, and transmit the first power to the light detection module, the charge and discharge control module and the constant current drive module; The power failure detection module is connected to the power control module and is used to perform power failure detection on the power control module and output a first control signal when the power control module is not connected to AC power; The charge and discharge control module is connected to the power failure detection module, and is used to perform voltage stabilization and filtering processing on the first electric energy and store the processed electric energy, and output the second electric energy when receiving the first control signal; The light detection module is connected to the charge and discharge control module, and is used to receive the first electric energy or the second electric energy and perform light detection, and output a second control signal when the detected signal is lower than a set low light threshold; The constant current driving module is connected to the charge and discharge control module, and is used to perform current sampling and perform constant current and voltage stabilization processing on the received first electric energy or the second electric energy and output the third electric energy; The LED control module is connected to the constant current driving module and the light detection module, and is used to receive the third electric energy and perform a power-off display operation, and perform a lighting operation when receiving the third electric energy and the second control signal.
2. The LED emergency light control circuit according to claim 1, characterized in that: The power control module includes a power interface, a first transformer, a first rectifier, a first diode, a first capacitor and a first key switch; the power failure detection module includes a first resistor, a second resistor, a first power supply and a first optical coupler; The first end and the second end of the power interface are respectively connected to the first end and the second end of the primary side of the first transformer, the first end of the secondary side of the first transformer is connected to the first end of the first rectifier and the first end of the first optocoupler through the first resistor, the second end of the secondary side of the first transformer is connected to the second end of the first rectifier and the second end of the first optocoupler, the third end of the first optocoupler is connected to the charge and discharge control module and is connected to the first power supply through the second resistor, the fourth end of the first optocoupler is grounded, the third end of the first rectifier is connected to the anode of the first diode and the first end of the first capacitor, the second end of the first capacitor and the fourth end of the first rectifier are both grounded, the cathode of the first diode is connected to the moving end of the first key switch, and the static end of the first key switch is connected to the light detection module.
3. The LED emergency light control circuit according to claim 2, characterized in that: The charge and discharge control module includes a first voltage stabilizer, a first potentiometer, a third resistor, a second capacitor, a first power tube, a second diode and a backup power supply; The third end of the first voltage regulator is connected to the first end of the first capacitor, the second end of the first voltage regulator is connected to one end of the backup power supply, the drain of the first power tube and one end of the second capacitor, and one end of the first potentiometer and the first end of the first voltage regulator are connected through the third resistor, the source of the first power tube is connected to the anode of the second diode, the cathode of the second diode is connected to the static end of the first key switch, the gate of the first power tube is connected to the third end of the first optocoupler, the other end of the first potentiometer and the slider end are grounded, and the other end of the second capacitor and the other end of the backup power supply are grounded.
4. The LED emergency light control circuit according to claim 3, characterized in that: The constant current driving module includes a fourth resistor, a fifth resistor, a third diode, a first driver, a sixth resistor, a seventh resistor, a second power tube, a fourth diode, a third capacitor and a first inductor; The eighth end and the sixth end of the first driver are connected to the cathode of the third diode, one end of the third capacitor and the static end of the first key switch, and are connected to one end of the fifth resistor, the cathode of the fourth diode and the first end of the first driver through the fourth resistor. The fifth end of the first driver is connected to the gate of the second power tube, the drain of the second power tube is connected to the anode of the third diode, the other end of the third capacitor and the first end of the first inductor, the source of the second power tube is connected to the third end of the first driver and is grounded through the seventh resistor, the second end of the first driver is grounded through the sixth resistor, the anode of the fourth diode, the other end of the fifth resistor, the fourth end and the seventh end of the first driver are all grounded, and the second end of the first inductor is connected to the LED control module.
5. The LED emergency light control circuit according to claim 4, characterized in that: The LED control module includes a first LED lamp, a second LED lamp, a third LED lamp and a third power tube; The first end of the first LED lamp is connected to the first end of the second LED lamp, the first end of the third LED lamp and the cathode of the third diode, the second end of the first LED lamp is connected to the second end of the first inductor and the source of the third power tube, the drain of the third power tube is connected to the second end of the second LED lamp and the second end of the third LED lamp, and the gate of the third power tube is connected to the light detection module.
6. The LED emergency light control circuit according to claim 5, characterized in that: The light detection module includes an eighth resistor, a first photoresistor, a ninth resistor, a tenth resistor and a first comparator; The in-phase end of the first comparator is connected to one end of the first photoresistor and is connected to one end of the ninth resistor and the cathode of the second diode through the eighth resistor. The other end of the ninth resistor is connected to the inverting end of the first comparator and is connected to the other end of the first photoresistor and the ground through the tenth resistor. The output end of the first comparator is connected to the gate of the third power tube.