LED lamp strip and control circuit
By combining a current limiting module, a rectification module, a step-down module, a control module, and a switching transistor, the problems of complex structure and high cost of LED strip control circuits are solved, and synchronous control of each LED on the strip is achieved, simplifying the circuit design.
Patent Information
- Application Number
- CN202520137004.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing LED light strip control circuits are complex and costly, making it difficult to achieve synchronous control of all LEDs on the light strip.
A combined circuit consisting of a current limiting module, a rectification module, a step-down module, a control module, and a switching transistor is used to achieve synchronous control of the LED light strip through current limiting, rectification, step-down, and control signals. An MCU is used as the control module, which simplifies the circuit structure and reduces costs.
It achieves synchronous control of all LEDs on the LED strip, simplifies the circuit design, reduces costs, and realizes synchronous control of the structure, which has advantages.
Smart Images
Figure CN223772191U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of circuit design, and in particular to an LED light strip and its control circuit. Background Technology
[0002] LED (Light Emitting Diode) is a semiconductor light source that emits light by converting electrical energy into light energy. It boasts advantages such as high efficiency and energy saving, long lifespan, small size, fast response speed, rich colors, and environmental friendliness. Due to these numerous advantages, LEDs play an increasingly important role in modern technology and life, continuously driving development and innovation in related fields. They are widely used in lighting, displays, indicator lights, automotive lighting, medical equipment, plant growth, and other areas.
[0003] As the application fields of LED lights continue to expand, the control requirements for LED lights are becoming increasingly stringent. Among these, how to reduce the power consumption of LED drivers, how to reduce costs, how to simplify circuits, and how to achieve synchronous control of LED strips are problems that need to be solved by those skilled in the art.
[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content
[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide an LED light strip and control circuit to solve the problems of complex structure and high cost of LED light strip control circuits in the prior art.
[0006] To achieve the above and other related objectives, this utility model provides a control circuit for controlling LED light strips, the control circuit comprising at least:
[0007] Current limiting module, rectifier module, step-down module, control module and switching transistor;
[0008] The current limiting module receives AC power and limits the current of the AC power.
[0009] The rectifier module is connected to the output terminal of the current limiting module to convert the current-limited AC power into DC power.
[0010] The step-down module is connected to the output terminal of the rectifier module to step down the DC power supply to obtain the operating voltage;
[0011] The control module is connected to the output terminal of the step-down module, operates based on the working voltage, and generates a switching control signal;
[0012] The switching transistor is connected in series with the external LED module across the DC power supply, and the switching transistor is controlled by the switching control signal.
[0013] Optionally, the current limiting module includes a first capacitor, which is connected in series between the AC power supply and the input terminal of the rectifier module.
[0014] Alternatively, the current limiting module further includes a first resistor, which is connected in series with the first capacitor between the AC power supply and the input terminal of the rectifier module.
[0015] Alternatively, the current limiting module may further include a second resistor connected in parallel across the first capacitor.
[0016] Optionally, the step-down module includes a third resistor, a first diode, and a second diode; one end of the third resistor is connected to the DC power supply, and the other end is connected to the cathode of the first diode; the anode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is grounded; the connection node between the first diode and the second diode outputs the operating voltage.
[0017] Alternatively, the step-down module may further include a third diode, the anode of which is connected to the connection node between the first diode and the second diode, and the cathode of which outputs the operating voltage.
[0018] Alternatively, the step-down module may further include a second capacitor, one end of which is connected to the operating voltage and the other end is grounded.
[0019] Optionally, the control module is an MCU.
[0020] Optionally, the control circuit further includes a fourth resistor and a fifth resistor. One end of the fourth resistor receives the switch control signal, and the other end is connected to the control terminal of the switch transistor. One end of the fifth resistor is connected to the control terminal of the switch transistor, and the other end is grounded.
[0021] To achieve the above and other related objectives, this utility model also provides an LED light strip, which includes at least:
[0022] N LED strings and the above control circuit, where N is a natural number greater than or equal to 2;
[0023] Each LED string is connected in parallel to form an LED module, and the LED module is connected in series with the switching transistor in the control circuit. The current flowing through each LED is equal, and each LED has at least two colors.
[0024] As described above, the LED light strip and control circuit of this utility model have the following beneficial effects:
[0025] The LED light strip and control circuit of this invention can realize the synchronous control of each LED on the same light strip (flickering at the same time and displaying the same color); at the same time, this invention supplies power to the LED and MCU through the mains power and controls the LED through the MCU, which has the advantages of simple structure and low cost. Attached Figure Description
[0026] Figure 1 The diagram shown is a schematic block diagram of the control circuit of this utility model.
[0027] Figure 2 The diagram shown is a structural schematic of the control circuit of this utility model.
[0028] Figure 3 The diagram shown is a structural schematic of the LED light strip of this utility model.
[0029] Component designation explanation
[0030] 1. Control Circuit
[0031] 11. Rate limiting module
[0032] 12 Rectifier Modules
[0033] 13. Step-down module
[0034] 14 Control Module
[0035] 15 Switching transistors
[0036] 16 AC power supply terminals
[0037] 17 LED connection ports
[0038] 2 LED light strings Detailed Implementation
[0039] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.
[0040] Please see Figures 1-3 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0041] like Figure 1 As shown, this utility model provides a control circuit 1 for an LED light strip, which includes:
[0042] The current limiting module 11, the rectifier module 12, the step-down module 13, the control module 14, and the switching transistor 15 are included.
[0043] like Figure 1 As shown, the current limiting module 11 receives AC power and limits the current of AC power.
[0044] Specifically, the current limiting module 11 is connected between the AC power supply terminal 16 and the rectifier module 12. In this embodiment, the current limiting module 11 is implemented using a capacitive-resistive circuit. As an example, such as... Figure 2 As shown, the current limiting module 11 includes a first capacitor C1, which is connected in series between the AC power supply AC and the input terminal of the rectifier module 12. The first capacitor C1 generates capacitive reactance under the influence of the AC power supply, which limits the current flowing through it. This capacitive reactance satisfies the following conditions: Where f is the frequency of the AC power supply and C is the capacitance of the first capacitor C1; based on the above formula (1), the capacitive reactance value of the first capacitor C1 at a specific frequency can be calculated, thereby limiting the current passing through the first capacitor C1.
[0045] Furthermore, the current limiting module 11 also includes a first resistor R1, which is connected in series with the first capacitor C1 between the AC power supply AC and the input terminal of the rectifier module 12. The first resistor R1 is used to limit the large starting current and prevent the first capacitor C1 from burning out.
[0046] Furthermore, the current limiting module 11 also includes a second resistor R2, which is connected in parallel across the first capacitor C1. The second resistor R2 acts as a bleed resistor, providing a discharge path for the first capacitor C1.
[0047] It should be noted that any circuit structure capable of limiting the current of the input AC power supply is applicable to this invention and is not limited to this embodiment. In this example, the AC unit is supplied by mains power.
[0048] like Figure 1 As shown, the rectifier module 12 is connected to the output terminal of the current limiting module 11 to convert the current-limited AC power supply into DC power supply (i.e., bus voltage).
[0049] Specifically, in this example, the rectifier module 12 is a rectifier bridge structure composed of four rectifier diodes; in actual use, any circuit structure that can realize AC-DC conversion is applicable to this utility model, and will not be described in detail here.
[0050] Specifically, in this example, a third capacitor C3 is also provided at the output terminal of the rectifier module 12; the upper plate of the third capacitor C3 is connected to the positive output terminal of the rectifier module 12, and the lower plate is connected to the reverse output terminal (usually grounded) of the rectifier module 12, for stabilizing the DC power supply.
[0051] like Figure 1 As shown, the step-down module 13 is connected to the output terminal of the rectifier module 12 to step down the DC power supply to obtain the working voltage.
[0052] Specifically, the step-down module 13 steps down the DC power supply to power the control module 14. For example... Figure 2 As shown, in this example, the step-down module 13 includes a third resistor R3, a first diode D1, and a second diode D2; one end of the third resistor R3 is connected to a DC power supply, and the other end is connected to the cathode of the first diode D1; the anode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is grounded; the connection node between the first diode D1 and the second diode D2 (i.e., the anode of the first diode D1 and the cathode of the second diode D2) outputs a working voltage; the step-down module 13 obtains a stable working voltage through the voltage division of the third resistor R3, the first diode D1, and the second diode D2.
[0053] Furthermore, the step-down module 13 also includes a third diode D3. The anode of the third diode D3 is connected to the connection node of the first diode D1 and the second diode D2, and the cathode outputs the operating voltage. The third diode D3 is used to limit the direction of current flow, further ensuring the stability of the operating voltage.
[0054] Furthermore, the step-down module 13 also includes a second capacitor C2, one end of which is connected to the operating voltage and the other end is grounded. In this example, to reduce the area of the second capacitor C2, two small capacitors are connected in parallel to obtain the second capacitor C2. In actual use, the second capacitor C2 can be obtained by connecting more than two small capacitors in parallel, and is not limited to this embodiment.
[0055] like Figure 1 As shown, the control module 14 is connected to the output terminal of the step-down module 13, operates based on the working voltage, and generates a switching control signal.
[0056] Specifically, in this embodiment, the control module 14 is implemented using an MCU (Microcontroller Unit). The MCU can be configured according to control needs to obtain switching control signals that meet the control requirements; in this example, the control module 14 generates switching control signals to control the LED lights to switch between different colors.
[0057] like Figure 1 As shown, the switching transistor 15 is connected in series with the external LED module across the DC power supply, and the switching transistor 15 is controlled by the switching control signal.
[0058] Specifically, in this embodiment, the switching transistor 15 is an NPN transistor, with its collector connected to one end of the LED connection port 17, its emitter grounded, and its base receiving the switching control signal. The other end of the LED connection port 17 is connected to a DC power supply, meaning the LED is powered by the DC power supply. In practical use, the DC power supply can power the LED via the switching transistor 15, and is not limited to this embodiment; furthermore, any device that can implement the switching function in this invention can be used as the switching transistor 15, including but not limited to NMOS transistors.
[0059] As another implementation of this utility model, the control circuit 1 further includes a fourth resistor R4 and a fifth resistor R5; wherein, one end of the fourth resistor R4 receives the switch control signal, and the other end is connected to the control terminal of the switch transistor 15 (the base of the NPN transistor); one end of the fifth resistor R5 is connected to the control terminal of the switch transistor 15, and the other end is grounded.
[0060] like Figure 3 As shown, this utility model also provides an LED light strip, which includes:
[0061] N LED light strings 2 and the above control circuit 1, where N is a natural number greater than or equal to 2.
[0062] like Figure 3 As shown, each LED string 2 is connected in parallel to form an LED module. The LED module is connected in series with the switching transistor 15 in the control circuit 1. The current flowing through each LED string 2 is equal, and each LED string 2 has at least two colors.
[0063] Specifically, in this example, the number of LED light strings is set to 3 (N=3). In actual use, the value of N can be set as needed. In addition, the number of LED beads in each LED light string can be set as needed, which will not be elaborated here.
[0064] Since each LED string 2 has the same structure and parameters and is controlled by the same switching transistor 15, the current flowing through each LED string 2 is the same. By configuring the corresponding current, the corresponding color temperature can be obtained, thereby enabling each LED to switch colors simultaneously and the switched colors are consistent (that is, each LED on the light strip flashes and switches to the same color at the same time).
[0065] In summary, this utility model provides an LED light strip and control circuit, including: a current limiting module, a rectifier module, a step-down module, a control module, and a switching transistor. The current limiting module receives AC power and limits the current of the AC power. The rectifier module is connected to the output terminal of the current limiting module and converts the current-limited AC power into DC power. The step-down module is connected to the output terminal of the rectifier module and steps down the DC power to obtain the operating voltage. The control module is connected to the output terminal of the step-down module, operates based on the operating voltage, and generates a switching control signal. The switching transistor is connected in series with an external LED module across the DC power supply, and the switching transistor is controlled by the switching control signal. This utility model's LED light strip and control circuit can achieve synchronous control of all LEDs on the same light strip; at the same time, it has the advantages of simple structure and low cost. Therefore, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.
[0066] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A control circuit for controlling an LED light strip, characterized in that, The control circuit at least comprises: a current-limiting module, a rectifier module, a voltage-reducing module, a control module and a switch tube; The current-limiting module receives an alternating current power supply and limits the current of the alternating current power supply; The rectifier module is connected to the output end of the current-limiting module and converts the current-limited alternating current power supply into a direct current power supply; The voltage-reducing module is connected to the output end of the rectifier module, reduces the voltage of the direct current power supply, and obtains a working voltage; The control module is connected to the output end of the voltage-reducing module, works based on the working voltage, and generates a switch control signal; The switch tube is connected in series with an external LED module across the direct current power supply, and is controlled by the switch control signal.
2. The control circuit of claim 1, wherein: The current-limiting module comprises a first capacitor connected in series between the alternating current power supply and the input end of the rectifier module.
3. The control circuit of claim 2, wherein: The current-limiting module further comprises a first resistor connected in series with the first capacitor between the alternating current power supply and the input end of the rectifier module.
4. A control circuit according to claim 2 or 3, characterised in that: The current-limiting module further comprises a second resistor connected in parallel across the first capacitor.
5. The control circuit of claim 1, wherein: The voltage-reducing module comprises a third resistor, a first diode and a second diode; one end of the third resistor is connected to the direct current power supply, and the other end is connected to the cathode of the first diode; the anode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is grounded; the connection node of the first diode and the second diode outputs the working voltage.
6. The control circuit of claim 5, wherein: The voltage-reducing module further comprises a third diode, the anode of which is connected to the connection node of the first diode and the second diode, and the cathode of which outputs the working voltage.
7. The control circuit of claim 5 or 6, wherein: The voltage-reducing module further comprises a second capacitor, one end of which is connected to the working voltage, and the other end of which is grounded.
8. The control circuit of claim 1, wherein: The control module is an MCU.
9. The control circuit of claim 1, wherein: The control circuit further comprises a fourth resistor and a fifth resistor, one end of the fourth resistor receives the switch control signal, and the other end of the fourth resistor is connected to the control end of the switch tube; one end of the fifth resistor is connected to the control end of the switch tube, and the other end of the fifth resistor is grounded.
10. An LED light strip, characterized in that, The LED lamp strip at least comprises: N LED lamp strings and the control circuit according to any one of claims 1-9, N being a natural number greater than or equal to 2; Each LED lamp string is connected in parallel to form an LED module, and the LED module is connected in series with the switch tube in the control circuit, wherein the currents flowing through each LED lamp are equal, and each LED lamp has at least two colors.