LED lamp control driving power supply circuit

Abstract

The utility model relates to LED control technical field especially a kind of LED lamp control driving power supply circuit, including direct current power supply, drive switch, first resistance, second resistance, third resistance, fourth resistance, fifth resistance, sixth resistance, first NPN triode, second NPN triode, first electrolytic capacitor and second electrolytic capacitor, the utility model can realize reliable double LED alternate flicker drive.

Description

Technical Field

[0001] This utility model relates to the field of LED driver control technology, specifically to an LED lamp control driver power supply circuit. Background Technology

[0002] LED strobe lights, as a new type of special lighting fixture, play an important role in industrial warnings, traffic signals, and other fields. Traditional strobe lights mostly use a single-LED drive mode, achieving periodic flashing through a PWM control circuit. However, this design has significant technical drawbacks: First, continuous operation of a single LED can easily lead to localized overheating, accelerating light decay and damage. Second, current technology struggles to achieve independent brightness adjustment and precise timing control for multiple LEDs. Third, for applications requiring different flashing frequencies, traditional circuits cannot achieve flexible frequency adjustment; their frequency response range is limited, making it difficult to meet rapidly changing flashing demands. Furthermore, existing drive circuits lack precision in oscillation frequency control, failing to achieve independent adjustment of capacitor parameters, resulting in a limited and uncustomizable flashing effect. These problems severely restrict the reliability and adaptability of LED strobe lights in complex application environments.

[0003] To address the aforementioned issues, existing technologies urgently need improvement. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an LED lamp control driver power supply circuit.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an LED lamp control driver power supply circuit, including a DC power supply, a driver switch, a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a first NPN transistor (Q1), a second NPN transistor (Q2), a first electrolytic capacitor (C1), and a second electrolytic capacitor (C2); The positive terminal of the DC power supply is connected in series with the drive switch to form a power supply node (Vcc). The power supply node (Vcc) is electrically connected to one end of the first resistor (R1), one end of the second resistor (R2), one end of the third resistor (R3), one end of the fourth resistor (R4), one end of the fifth resistor (R5), and one end of the sixth resistor (R6), respectively. The other end of the first resistor (R1) is connected in series with the first LED (D1) and then electrically connected to the collector of the first NPN transistor (Q1); the other end of the second resistor (R2) is connected in series with the second LED (D2) and then electrically connected to the collector of the second NPN transistor (Q2). The other end of the third resistor (R3) and the positive terminal of the first electrolytic capacitor (C1) are both electrically connected to the collector of the first NPN transistor (Q1). The negative terminal of the first electrolytic capacitor (C1) is electrically connected to the other end of the fourth resistor (R4) and the base of the second NPN transistor (Q2); The other end of the fifth resistor (R5) and the positive terminal of the second electrolytic capacitor (C2) are both electrically connected to the base of the first NPN transistor (Q1). The negative terminal of the second electrolytic capacitor (C2) is electrically connected to the other end of the sixth resistor (R6) and the collector of the second NPN transistor (Q2); The emitter of the first NPN transistor (Q1) and the emitter of the second NPN transistor (Q2) are both grounded; The drive switch is used to control the connection and disconnection of the DC power supply and the circuit.

[0006] In some embodiments, the DC power supply is a battery or a DC regulated power supply with an output voltage range of 3V to 12V.

[0007] In some embodiments, the resistance values ​​of the first resistor (R1) and the second resistor (R2) can be adjusted independently to change the brightness of the first LED (D1) and the second LED (D2).

[0008] In some embodiments, the resistance ratio of the third resistor (R3) to the fourth resistor (R4) determines the conduction time of the first NPN transistor (Q1); the resistance ratio of the fifth resistor (R5) to the sixth resistor (R6) determines the conduction time of the second NPN transistor (Q2).

[0009] In some embodiments, the capacitances of the first electrolytic capacitor (C1) and the second electrolytic capacitor (C2) can be adjusted independently to change the oscillation frequency of the circuit; and their capacitances can be the same or different.

[0010] Compared with the prior art, the beneficial effects of this utility model are: by using an oscillation circuit composed of dual transistors and a resistor-capacitor network, two LEDs can be turned on alternately. The transistor turn-on sequence is controlled by the resistor ratio, and the oscillation frequency is adjusted independently by the capacitor parameters. This has the advantages of solving the problem of single LED overheating, realizing independent brightness adjustment of multiple LEDs, and precise frequency control.

[0011] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. The embodiments of this application will provide a detailed description and understanding of the application. Attached Figure Description

[0012] Figure 1 This is the circuit schematic diagram of this utility model.

[0013] In the diagram: 1. Power supply; 2. Drive switch; 3. Resistor 1; 4. Resistor 2; 5. Resistor 3; 6. Resistor 4; 7. Resistor 5; 8. Resistor 6; 9. Transistor 1; 10. Transistor 2; 11. Capacitor 1; 12. Capacitor 2. Detailed Implementation

[0014] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] In existing technologies, LED strobe lights mostly use a single LED chip, driven by a PWM control circuit for regular power supply. However, prolonged use of a single LED chip can easily lead to chip damage. For scenarios with different frequency requirements, existing solutions have frequency control limitations, making it impossible to achieve rapid and continuous adjustment, and significantly accelerating LED aging. For example, in warning scenarios requiring alternating flashing, continuous high-frequency operation of a single LED chip will shorten its lifespan due to heat accumulation.

[0016] To address the aforementioned issues, a drive scheme is needed that can reduce the workload of a single lamp, extend its lifespan, and offer flexible frequency adjustment. Analysis revealed that alternating dual-lamp drive can disperse heat accumulation, but achieving precise alternating control remains a challenge. Further consideration was given to utilizing the switching characteristics of transistors and the RC charging and discharging principle to construct an oscillation circuit for automatic dual-lamp switching.

[0017] Therefore, as Figure 1As shown, this application proposes a circuit structure including a DC power supply, a drive switch, six resistors, two NPN transistors, and two electrolytic capacitors. The positive terminal of the DC power supply is connected in series with the drive switch to form a power supply node, which is connected to one end of each resistor. The other end of the first resistor is connected in series with the first LED and then to the collector of the first NPN transistor. The other end of the second resistor is connected in series with the second LED and then to the collector of the second NPN transistor. The positive terminals of the third resistor and the first electrolytic capacitor are both connected to the collector of the first NPN transistor, and the negative terminal of the first electrolytic capacitor is connected to the fourth resistor and the base of the second NPN transistor. The positive terminals of the fifth resistor and the second electrolytic capacitor are both connected to the base of the first NPN transistor, and the negative terminal of the second electrolytic capacitor is connected to the sixth resistor and the collector of the second NPN transistor. The emitters of both transistors are grounded, and the drive switch controls the power supply's on / off state.

[0018] The DC power supply refers to a device that provides a stable voltage input, which can be implemented using a battery or a DC regulated power supply. For example, the output voltage range can be set from 3V to 12V to adapt to the different operating voltage requirements of LEDs. The first and second resistors are current-limiting components connected in series in the LED branch. Their resistance values ​​can be adjusted independently. For example, by changing different resistor values, the driving current of the corresponding LED can be changed, thereby adjusting the brightness. The third and fourth resistors are components that constitute the base bias network of the first NPN transistor. The resistance ratio determines the conduction time of the first NPN transistor. For example, when the resistance of the third resistor is greater than that of the fourth resistor, the capacitor charging time is extended. The fifth and sixth resistors are components that constitute the base bias network of the second NPN transistor. Their resistance ratio determines the conduction time of the second NPN transistor. For example, by adjusting their ratio, the oscillation period can be changed. The first and second electrolytic capacitors are energy storage components used to form a charging and discharging circuit. Their capacitance can be adjusted independently. For example, using 10μF to 100μF electrolytic capacitors can change the charging and discharging rate, thereby adjusting the alternation frequency of the two lamps.

[0019] Specifically, when the drive switch is closed, the power supply node provides voltage to each resistor and capacitor. The first electrolytic capacitor charges through the third resistor. When the voltage reaches the conduction threshold of the second NPN transistor, the second NPN transistor conducts, illuminating the second LED. At this time, the first electrolytic capacitor discharges through the fourth resistor, causing the first NPN transistor to turn off. Simultaneously, the second electrolytic capacitor charges through the fifth resistor. When the voltage reaches the conduction threshold of the first NPN transistor, the first NPN transistor conducts, illuminating the first LED. The second electrolytic capacitor discharges through the sixth resistor, turning off the second NPN transistor. This process cycles, creating alternating blinking of the two LEDs. Adjusting the ratio of the third to the fourth resistor changes the duration of the first LED's illumination, and adjusting the ratio of the fifth to the sixth resistor changes the duration of the second LED's illumination. Adjusting the capacitance of the two capacitors allows independent control of the charging and discharging rates, achieving continuous adjustment of the blinking frequency.

[0020] Compared to existing technologies, where LEDs in current single-lamp drive schemes are constantly subjected to current surges, this solution utilizes dual transistors and an RC network to create a self-excited oscillation, allowing the two LEDs to operate alternately and distributing the heat load. Traditional PWM control relies on an external signal generator; this solution directly determines the oscillation parameters through the resistor ratio and capacitor capacitance, achieving frequency adjustment without the need for complex control chips. For example, in warning light applications, different flashing specifications can be quickly matched by replacing resistors without redesigning the control circuit.

[0021] Through the above technical solutions, this application effectively reduces the operating time of a single LED and slows down the light decay rate. Simultaneously, by adjusting the combination of resistor ratio and capacitor capacitance, continuous control of the flicker frequency over a wide range is achieved. The dual-lamp alternation mechanism avoids overheating damage to a single LED, and the RC oscillation structure simplifies circuit complexity and improves system reliability. For example, in traffic warning scenarios, adjusting the resistance values ​​of the third and fifth resistors can create an asymmetrical flickering mode between the two lights, enhancing the visual warning effect. This application further proposes that the DC power supply is a battery or a DC regulated power supply with an output voltage range of 3V to 12V.

[0022] The DC power supply refers to a device that provides stable DC power to the circuit. Specifically, it can be implemented using rechargeable batteries such as lithium-ion batteries or nickel-metal hydride batteries, or a voltage regulator circuit based on chips such as LM7805 or LM317. This feature ensures a stable input voltage for the circuit in different application scenarios by selecting an appropriate power supply type. The output voltage range refers to the voltage range that the power supply can continuously provide. For example, a range from 3V to 12V can be achieved by adjusting the voltage divider resistors of the voltage regulator circuit or by selecting different battery combinations. This range covers the operating voltage requirements of common LED lights, avoiding abnormal driving due to insufficient or excessive voltage.

[0023] Specifically, when a battery is used as the power source, such as a 9V prismatic battery or two AA batteries connected in series, it can provide power to portable devices. The DC regulated power supply, through rectification, filtering, and a voltage regulator module, outputs a constant voltage; for example, an adapter converts AC power to 12V DC. When the output voltage is set to 3V, it can drive low-power LEDs; when adjusted to 12V, it is suitable for high-brightness LED arrays. By adjusting the power supply type and voltage value, the circuit can be adapted to different brightness requirements or installation environments.

[0024] This solution expands the power supply type and voltage range, enabling the same circuit to be used for both low-power warning lights and high-power lighting equipment, while avoiding overvoltage damage to the LEDs caused by voltage fluctuations.

[0025] Through the above technical solution, this application solves the problems of poor compatibility and easy aging of LED lights caused by single power supply mode. By wide voltage adaptation, the electrical stress of the lamp beads during operation is reduced, the service life is extended, and the power supply requirements of mobile devices and fixed devices are met. This application further proposes that the resistance values ​​of the first resistor R1 and the second resistor R2 can be adjusted independently to change the brightness of the first LED D1 and the second LED D2.

[0026] Independent resistance adjustment means that the resistance value of each resistor can be adjusted individually. This can be achieved using variable resistors or adjustable potentiometers, adjusting the current flowing through the corresponding LED by changing the resistance value. Brightness adjustment refers to controlling the LED's operating current by adjusting the resistance value. This is achieved by changing the voltage division relationship between the resistor and the transistor's base. Changes in resistance directly affect the transistor's conduction level, thus adjusting the LED's luminous intensity.

[0027] Specifically, when adjusting the brightness of the first LED D1, the resistance value of the first resistor R1 is changed. For example, by adjusting R1 to a lower resistance value, the base current flowing through the first NPN transistor Q1 increases, enhancing the conduction of Q1 and thus increasing the operating current of D1, thereby increasing the brightness. Similarly, adjusting the resistance value of the second resistor R2 can independently control the brightness of the second LED D2. Since the adjustments of the two resistors do not affect each other, D1 and D2 can be set to different brightness combinations, such as D1 being brighter while D2 is dimmer, or both having the same brightness.

[0028] This solution allows for independent adjustment of the resistor value, enabling flexible setting of the operating current for each LED light according to requirements, avoiding continuous overload of a single LED, and supporting multiple brightness combination modes.

[0029] Through the above technical solution, this application can achieve flexible control of LED brightness by independently adjusting the resistance value, reduce the risk of damage to a single LED bead due to long-term high-load operation, and provide customizable brightness combination solutions for different application scenarios. This application further proposes that the resistance ratio of the third resistor to the fourth resistor determines the conduction time of the first NPN transistor; and the resistance ratio of the fifth resistor to the sixth resistor determines the conduction time of the second NPN transistor.

[0030] The resistance ratio of the third and fourth resistors refers to the proportional relationship between their resistance values. This can be achieved by adjusting their resistance ranges; for example, the third resistor could be from 1kΩ to 10kΩ, and the fourth resistor from 10kΩ to 100kΩ. This ratio controls the duration of the conduction state of the first NPN transistor by influencing the rate of voltage change at its base. Similarly, the resistance ratio of the fifth and sixth resistors also refers to the proportional relationship between their resistance values. This can be achieved by adjusting their resistance ranges; for example, the fifth resistor could be from 1kΩ to 10kΩ, and the sixth resistor from 10kΩ to 100kΩ. This ratio controls the duration of the conduction state of the second NPN transistor by influencing the rate of voltage change at its base.

[0031] Specifically, the resistance ratio of the third resistor to the fourth resistor determines the charging and discharging time constant of the first electrolytic capacitor, which in turn affects the time it takes for the base voltage of the first NPN transistor to reach the conduction threshold. When the ratio increases, the charging time of the first electrolytic capacitor lengthens, and the conduction time of the first NPN transistor increases accordingly. Similarly, the resistance ratio of the fifth resistor to the sixth resistor determines the charging and discharging time constant of the second electrolytic capacitor, which in turn controls the conduction time of the second NPN transistor. By independently adjusting the ratio of the two sets of resistors, the conduction time of each transistor can be set separately, thereby achieving the timing control of the alternating blinking of the two LEDs.

[0032] This solution directly correlates the conduction time with the resistance ratio, allowing for flexible expansion of the frequency range by adjusting the resistance value, and also supports independent timing configuration for dual lamps.

[0033] Through the above technical solution, this application solves the problem of damage caused by continuous operation of a single LED bead, disperses the heat load by driving two LEDs alternately; at the same time, by continuously adjusting the resistance ratio, it breaks through the fixed frequency limit, realizes a smooth switch from low frequency to high frequency, and avoids accelerated LED aging due to extreme frequency. This application further proposes that the capacitance of the first electrolytic capacitor and the second electrolytic capacitor can be adjusted independently to change the oscillation frequency of the circuit; and the capacitances of the two capacitors can be the same or different.

[0034] The ability to independently adjust the capacitance refers to regulating the charging and discharging time constant by changing the capacitance value. This can be achieved by using an adjustable capacitor or replacing it with a fixed capacitor of different values. Adjusting the capacitance changes the RC time constant, thus affecting the oscillation frequency. The oscillation frequency refers to the circuit operating frequency formed by the transistor's on / off cycle. This can be achieved by adjusting the charging and discharging speeds of the RC circuits formed by the first electrolytic capacitor and the third and fourth resistors, as well as the RC circuits formed by the second electrolytic capacitor and the fifth and sixth resistors. Different capacitance combinations can create different charging and discharging rates.

[0035] Specifically, the first electrolytic capacitor, along with the third and fourth resistors, forms the first timing circuit, while the second electrolytic capacitor, along with the fifth and sixth resistors, forms the second timing circuit. When the capacitance of the first electrolytic capacitor increases, the time required for it to charge to the voltage threshold of the fourth resistor lengthens, resulting in an increase in the conduction time of the first NPN transistor. Conversely, when the capacitance of the second electrolytic capacitor decreases, its discharge speed through the sixth resistor accelerates, shortening the cutoff time of the second NPN transistor. By independently adjusting the capacitance values ​​of the two capacitors, the conduction-cutoff timing difference of the two transistors can be controlled, thereby changing the overall oscillation frequency of the circuit. For example, when high-frequency flickering is required, the capacitance values ​​of both capacitors can be set to smaller values; when low-frequency, long-period flickering is required, the capacitance values ​​of one or both capacitors can be increased.

[0036] This solution utilizes an independently adjustable capacitor design, enabling continuous control of the oscillation frequency by simply adjusting the capacitor value while maintaining the circuit structure. It also allows two capacitors to use the same or different capacitance combinations, providing a hardware foundation for multi-mode strobe control.

[0037] Through the above technical solution, this application achieves precise adjustment of the LED flashing frequency, solving the problem of frequency control having limits and being unable to be continuously adjusted in the prior art. By flexibly configuring the capacitor values, it can adapt to the flickering requirements under different operating conditions, avoiding accelerated aging of LED beads due to fixed high-frequency driving. At the same time, the dual-capacitor independent control design reduces the load pressure on a single LED bead, extending the lifespan of the luminaire.

[0038] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An LED lamp control driver power supply circuit, characterized in that: It includes a DC power supply, a drive switch, a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a first NPN transistor (Q1), a second NPN transistor (Q2), a first electrolytic capacitor (C1), and a second electrolytic capacitor (C2). The positive terminal of the DC power supply is connected in series with the drive switch to form a power supply node (Vcc). The power supply node (Vcc) is electrically connected to one end of the first resistor (R1), one end of the second resistor (R2), one end of the third resistor (R3), one end of the fourth resistor (R4), one end of the fifth resistor (R5), and one end of the sixth resistor (R6), respectively. The other end of the first resistor (R1) is connected in series with the first LED (D1) and then electrically connected to the collector of the first NPN transistor (Q1); the other end of the second resistor (R2) is connected in series with the second LED (D2) and then electrically connected to the collector of the second NPN transistor (Q2). The other end of the third resistor (R3) and the positive terminal of the first electrolytic capacitor (C1) are both electrically connected to the collector of the first NPN transistor (Q1). The negative terminal of the first electrolytic capacitor (C1) is electrically connected to the other end of the fourth resistor (R4) and the base of the second NPN transistor (Q2); The other end of the fifth resistor (R5) and the positive terminal of the second electrolytic capacitor (C2) are both electrically connected to the base of the first NPN transistor (Q1). The negative terminal of the second electrolytic capacitor (C2) is electrically connected to the other end of the sixth resistor (R6) and the collector of the second NPN transistor (Q2); The emitter of the first NPN transistor (Q1) and the emitter of the second NPN transistor (Q2) are both grounded; The drive switch is used to control the connection and disconnection between the DC power supply and the circuit.

2. The LED lamp control driver power supply circuit according to claim 1, characterized in that: The DC power supply is a battery or a DC regulated power supply, with an output voltage range of 3V to 12V.

3. The LED lamp control driver power supply circuit according to claim 1, characterized in that: The resistance values ​​of the first resistor (R1) and the second resistor (R2) can be adjusted independently to change the brightness of the first LED (D1) and the second LED (D2).

4. The LED lamp control driver power supply circuit according to claim 1, characterized in that: The resistance ratio of the third resistor (R3) to the fourth resistor (R4) determines the conduction time of the first NPN transistor (Q1); the resistance ratio of the fifth resistor (R5) to the sixth resistor (R6) determines the conduction time of the second NPN transistor (Q2).

5. The LED lamp control driver power supply circuit according to claim 1, characterized in that: The capacitances of the first electrolytic capacitor (C1) and the second electrolytic capacitor (C2) can be adjusted independently to change the oscillation frequency of the circuit; and their capacitances can be the same or different.

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