LED colored lamp control drive circuit

Abstract

The utility model relates to the technical field of LED power supplies, and discloses an LED colored lamp control drive circuit in order to solve the technical problem that an existing LED colored lamp control circuit in a low-frequency flicker application scene is high in cost. Comprising a basic oscillator used for providing fixed frequency, a plurality of adjustable oscillators used for providing adjustable frequency, a triode and an exclusive-OR gate, a first input end of the exclusive-OR gate is connected with an output end of the basic oscillator, a second input end of the exclusive-OR gate is connected with output ends of the adjustable oscillators, and an output end of the exclusive-OR gate is connected with a base electrode of the triode. The emitter of the triode is connected with the cathode of the power supply, and the collector of the triode is connected with the anode of the power supply through the current-limiting resistor and the LED. The output frequency is slightly deviated through the adjustable oscillator, then the output frequency is output in the exclusive-OR logic gate circuit for frequency mixing, then the action with the corresponding frequency is generated by controlling a post-stage triode, an LED in a triode collector circuit is made to generate preset brightness change, and the LED can generate the lamp effect of slowly moving.

Description

Technical Field

[0001] The utility model relates to the technical field of lamp power supply, in particular to an LED colored lamp control driving circuit. Background Art

[0002] Conventional LED color light control circuits usually use a PWM controller to generate a square wave signal, which then drives the MOS tube to control the LED on and off. The ordinary square wave drive signal causes the light produced by the LED to have a sudden change in light effect.

[0003] For example, the Chinese utility model patent with publication number CN205610983U discloses an LED color light controller circuit. Figure 1 It can be seen that two chips U1 and U2 are provided. If this circuit is used in a low-frequency flicker application scenario, the control through a PWM controller and other chips will result in a complex solution and high circuit cost. Utility Model Content

[0004] The utility model aims to provide an LED color light control driving circuit to solve the technical problem of high cost of the existing LED color light control circuit in low-frequency flickering application scenarios.

[0005] To achieve the above purpose, the specific technical solution of a LED colored light control driving circuit of the utility model is as follows:

[0006] The invention discloses an LED colored light control driving circuit, comprising a basic oscillator for providing a fixed frequency, a plurality of adjustable oscillators for providing adjustable frequencies, a plurality of triodes and an XOR gate, wherein a first input end of the XOR gate is connected to an output end of the basic oscillator, a second input end of the XOR gate is connected to an output end of the adjustable oscillator, an output end of the XOR gate is connected to a base of the triode, an emitter of the triode is connected to a negative electrode of a power supply, and a collector of the triode is connected to a positive electrode of a power supply via a current limiting resistor and an LED in sequence.

[0007] The basic oscillator is a first oscillator, the adjustable oscillator includes a first oscillator, a second oscillator and a third oscillator, the XOR gate includes a first XOR gate, a second XOR gate and a third XOR gate, the transistor includes a first transistor, a second transistor and a third transistor, and the current limiting resistor includes a current limiting resistor R37, a current limiting resistor R42 and a current limiting resistor R46.

[0008] Through multiple oscillators with adjustable frequencies, the flashing frequency of LED colored lights can be flexibly adjusted to meet the needs of different scenarios, thereby improving the flexibility and applicability of control.

[0009] The XOR gate mixes the signals from the basic oscillator and the adjustable oscillator to generate a composite driving signal, which can achieve more diverse and rich lighting effects and increase the variability and interest of LED colored lights.

[0010] By controlling multiple transistors, the on and off changes of the LED can be effectively managed to ensure the stable operation of the LED.

[0011] The current of the LED is controlled by a current limiting resistor to ensure that the LED works within a safe range, extend the service life of the LED, and improve the reliability and durability of the system.

[0012] The entire circuit design is relatively simple, using a combination of a basic oscillator and an adjustable oscillator, as well as a combination of an XOR gate and a triode, which reduces the number and complexity of components, reduces costs, and improves the convenience of manufacturing and maintenance.

[0013] It can be seen that the LED colored light control driving circuit has the advantages of high flexibility, rich light efficiency, stability and reliability, safety and durability, and simplicity and ease of use.

[0014] Furthermore, the output end of the adjustable oscillator is connected to its input end through an adjustable resistor and a fixed resistor, and the input ends of the basic oscillator and the adjustable oscillator are connected to the negative electrode of the power supply.

[0015] By connecting the output of the adjustable oscillator with an adjustable resistor and a fixed resistor, the output frequency of the oscillator can be adjusted. This allows users to fine-tune the flashing frequency of the LED lights as needed, making it more in line with the requirements of specific scenarios, and enhancing the user's customization and controllability. The circuit design is simple and effective, making the LED light control drive circuit more flexible and reliable.

[0016] Furthermore, a voltage stabilizing module is provided for stabilizing the power supply. The positive electrode of the power supply is connected to the input end of the voltage stabilizing module through a diode D23. The ground end of the voltage stabilizing module is connected to the negative electrode of the power supply. The output end of the voltage stabilizing module (U3) is used to supply power to the LED, the oscillator and the XOR gate. A capacitor C31 is provided between the output end and the ground end of the voltage stabilizing module U3.

[0017] By adding a voltage regulator module to stabilize the power supply, the stable operation of the LED color light control drive circuit can be ensured. A stable power supply can provide consistent voltage and current output, effectively protecting the LED and other circuit components from voltage fluctuations, extending their service life, and improving the brightness stability and color consistency of the LED. The setting of capacitor C31 helps to reduce noise and interference in the power supply, improves the anti-interference ability of the circuit, and further improves the performance and stability of the LED color lights. This design makes the LED color light control drive circuit more reliable and durable, while providing a more stable and reliable light effect.

[0018] The LED colored light control driving circuit provided by the utility model has the following advantages:

[0019] Multiple oscillators are used to slightly deviate the output frequency through adjustable resistors, and then the output is mixed in the XOR logic gate circuit, and then the corresponding frequency is generated by controlling the subsequent transistors to make the LED in the transistor collector circuit change in a predetermined light and dark. The utility model provides an LED color light control drive circuit that can make the controlled LED produce a slowly moving light effect, rather than a sudden change of light effect produced by an ordinary square wave drive signal. The PWM controller integrated circuit is not used, and the circuit is simple and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The LED colored light control driving circuit diagram provided by the utility model;

[0021] Figure 2 This is a circuit diagram of a front-stage power supply provided by the utility model.

[0022] Figure symbols: U1-A, first oscillator; U1-B, second oscillator; U1-C, third oscillator; U1-D, fourth oscillator; U2-A, first XOR gate; U2-B, second XOR gate; U2-C, third XOR gate; U3, voltage regulator module; Q16, first transistor; Q16, second transistor; Q16, third transistor. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] See also Figure 1 The utility model provides an LED colored light control driving circuit, including a first oscillator U1-A, the first oscillator U1-A is used as a basic oscillator of a fixed frequency, and the input end of the first oscillator U1-A is connected to the negative electrode of the power supply through a capacitor C25.

[0025] The output end of the first oscillator U1-A is connected to the first input end of the first XOR gate U2-A, the first input end of the second XOR gate U2-B, and the first input end of the third XOR gate U2-C respectively, the output end of the second oscillator U1-B is connected to the second input end of the first XOR gate U2-A, the output end of the third oscillator U1-C is connected to the second input end of the second XOR gate U2-B, the output end of the third oscillator U1-D is connected to the second input end of the third XOR gate U2-C, the output end of the first XOR gate U2-A is connected to the base of the first transistor Q16, and the output end of the second XOR gate U2-B is connected to the base of the first transistor Q16. The output end is connected to the base of the second transistor Q17, the output end of the third XOR gate U2-C is connected to the base of the third transistor Q18, the emitter of the first transistor Q16, the emitter of the second transistor Q17 and the emitter of the third transistor Q18 are connected to the negative electrode of the power supply, the collector of the first transistor Q16, the collector of the second transistor Q17 and the collector of the third transistor Q18 are connected to the positive electrode of the power supply through LEDs respectively, and the input ends of the second oscillator U1-B, the third oscillator U1-C and the third oscillator U1-D are grounded through capacitors C24, C27 and C28 respectively.

[0026] The output end of the second oscillator U1-B is connected to the input end through the adjustable resistor R38 and the resistor R39, the output end of the third oscillator U1-C is connected to the input end through the adjustable resistor R43 and the resistor R44, the output end of the fourth oscillator U1-D is connected to the input end through the adjustable resistor R47 and the resistor R48, and the output frequencies of the second oscillator U1-B, the second oscillator U1-C and the second oscillator U1-D can be adjusted by the adjustable resistor R38, the adjustable resistor R43 and the adjustable resistor R47 respectively.

[0027] The first XOR gate U2-A, the second XOR gate U2-B and the third XOR gate U2-C control the corresponding first transistor Q16, the second transistor Q17 and the third transistor Q18 by inputting high and low level signals to make the corresponding LEDs flash.

[0028] Current limiting resistors R37, R42 and R46 are respectively arranged between the collectors of the first transistor Q16, the second transistor Q17 and the third transistor Q18 and the LED, which can effectively limit the current of the LED, ensure that the LED works within a safe range, and prevent the LED from overheating or damage due to excessive current.

[0029] In order to make the voltage more stable, a voltage stabilizing module U3 is provided. The positive pole of the power supply is connected to the input end of the voltage stabilizing module U3 through a diode D23. The ground end of the voltage stabilizing module U3 is connected to the negative pole of the power supply V-. The output end of the voltage stabilizing module U3 supplies power to the LED, oscillator and XOR gate. A capacitor C31 is provided between the output end and the ground end of the voltage stabilizing module U3 to provide a stable DC power supply for all oscillators and XOR gate chips in the circuit. When the circuit is connected, all oscillators start to oscillate, and the three LEDs start to flash. The flashing frequency is determined by the adjustable resistors on the respective control circuits.

[0030] See also Figure 2 , the front-stage power supply circuit is used to convert AC mains power into DC power. The circuit includes a bridge rectifier circuit, which is composed of four diodes, to convert AC power into DC power. Subsequently, the output DC power is filtered through a filter circuit, which is composed of inductor L4, capacitor C32 and capacitor C33, to ensure the stability and smoothness of the current. In the AC part, the common-mode inductor T5 provides filtering and suppression of common-mode signals in the circuit, while in the DC part, a varistor is set to provide protection for the subsequent circuit.

[0031] The utility model provides a kind of LED color light control driving circuit. Through multiple oscillators with adjustable frequencies, the flashing frequency of the LED color light can be flexibly adjusted as needed to meet the needs of different scenes, and the flexibility and applicability of the control are enhanced. The XOR gate mixes the signals from the basic oscillator and the adjustable oscillator to generate a composite driving signal, thereby achieving more diversified and rich light effects and increasing the variability and interest of the LED color lights. Multiple triodes are used to control the on and off changes of the LED to ensure the stable operation of the LED. At the same time, the current of the LED is controlled by the current limiting resistor to ensure that the LED works within a safe range, extend the service life of the LED, and improve the reliability and durability of the system. The whole circuit design is relatively simple, and adopts a combination of a basic oscillator and an adjustable oscillator, as well as a combination of an XOR gate and a triode, which reduces the number and complexity of components, thereby reducing costs and improving the convenience of manufacturing and maintenance. In summary, the LED color light control driving circuit has the advantages of high flexibility, rich light effects, stability and reliability, safety and durability, and simplicity and ease of use.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED colored light control driving circuit, characterized in that: The invention comprises a basic oscillator for providing a fixed frequency, a plurality of adjustable oscillators for providing adjustable frequencies, and a plurality of triodes and XOR gates. The first input end of the XOR gate is connected to the output end of the basic oscillator, the second input end of the XOR gate is connected to the output end of the adjustable oscillator, the output end of the XOR gate is connected to the base of the triode, the emitter of the triode is connected to the negative pole of the power supply, and the collector of the triode is connected to the positive pole of the power supply through a current limiting resistor and an LED in sequence.

2. The LED colored light control driving circuit according to claim 1, characterized in that: The output end of the adjustable oscillator is connected to its input end through an adjustable resistor and a fixed resistor, and the input ends of the basic oscillator and the adjustable oscillator are connected to the negative electrode of the power supply.

3. The LED colored light control driving circuit according to claim 2, characterized in that: A voltage stabilizing module (U3) is also provided for stabilizing the power supply. The positive electrode of the power supply is connected to the input end of the voltage stabilizing module (U3) through a diode D23. The grounding end of the voltage stabilizing module (U3) is connected to the negative electrode of the power supply. The output end of the voltage stabilizing module (U3) is used to supply power to the LED, the oscillator and the XOR gate. A capacitor C31 is provided between the output end and the grounding end of the voltage stabilizing module U3.

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