Driving circuit of color temperature adjustable line lamp
By designing a driving circuit for adjustable color temperature linear lights, and using a voltage divider module to change the input voltage of the main control chip, PWM signals with different duty cycles are output, the problem of existing linear lights being unable to adjust color temperature is solved, achieving adjustable color temperature and ease of use.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2026-03-31
AI Technical Summary
Existing LED linear lights cannot adjust color temperature, which makes them inconvenient to use and increases inventory pressure for suppliers.
A driving circuit for an adjustable color temperature linear light was designed, including an LED+ port, an LED- port, a first voltage regulator module, a second voltage regulator module, a voltage divider module, and a main control chip U1. The input voltage of the main control chip U1 is changed by the voltage divider module, and PWM signals with different duty cycles are output to control the brightness of the light-emitting module, thereby changing the color temperature.
This enables adjustable color temperature of the light-emitting module, improving ease of use and reducing inventory pressure for suppliers.
Smart Images
Figure CN224068825U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of LED lighting technology, specifically to a driving circuit for an adjustable color temperature linear light. Background Technology
[0002] In recent years, with the advancement of light-emitting diode (LED) lighting technology, LED-based linear lighting has become increasingly common. Compared to traditional lighting fixtures, LED linear lighting has many advantages, such as energy saving, environmental friendliness, small size, high efficiency, and long lifespan.
[0003] However, existing LED linear lights still have many shortcomings that need to be improved. For example, most LED linear lights cannot adjust the color temperature, making them inconvenient to use and increasing the inventory pressure on suppliers. Utility Model Content
[0004] To address the shortcomings of existing technologies, a driving circuit for an adjustable color temperature linear light is provided.
[0005] To achieve the above objectives, this utility model provides a driving circuit for an adjustable color temperature linear light, which has an LED+ port and an LED- port, and further includes a first voltage regulator module, a second voltage regulator module, a voltage divider module, a main control chip U1, and a light-emitting module; the output terminal of the voltage regulator module is connected to the input terminal of the second voltage regulator module, and the output terminal of the second voltage regulator module is connected to the VCC interface of the main control chip U1; one end of the voltage divider module is connected to the LED- port, and the other end is connected to the VCC interface of the main control chip U1; the light-emitting module includes a first light-emitting unit and a second light-emitting unit, one end of the first light-emitting unit is connected to the PWMB interface of the main control chip U1, and the other end is connected to the LED+ port, and one end of the second light-emitting unit is connected to the PWM interface of the main control chip U1, and the other end is connected to the LED+ port.
[0006] According to one embodiment of the present invention, the first voltage regulator module includes a resistor R3, a transistor Q3, a Zener diode D1, and a capacitor C1; one end of the resistor R3 is connected to the LED-port and the collector of the transistor Q3, and the other end is connected to the base of the transistor Q3 and the cathode of the Zener diode D1; the emitter of the transistor Q3 is connected to one end of the capacitor C1 and the input terminal of the second voltage regulator module, and the other end of the capacitor C1 is connected to the anode of the Zener diode D1 and the LED-port.
[0007] According to one embodiment of the present invention, the second voltage regulator module includes a Zener transistor Q4 and a capacitor C2. The input terminal of the Zener transistor Q4 is connected to the output terminal of the first voltage regulator module, the ground terminal of the Zener transistor Q4 is connected to the LED port, the output terminal of the Zener transistor Q4 is connected to the VCC interface of the main control chip U1, and the capacitor C2 is connected in parallel to the output terminal and the ground terminal of the Zener transistor Q4.
[0008] According to one embodiment of the present invention, the voltage divider module includes a switch K1, a first voltage divider unit, a second voltage divider unit, and a third voltage divider unit. The switch K1 has a first port to a sixth port. The sixth port of the switch K1 is connected to the LED port. The fifth port of the switch K1 is connected to one end of the first voltage divider unit, and the other end of the first voltage divider unit is connected to the first pin of the main control chip U1. The fourth port of the switch K1 is connected to the third pin of the main control chip U1. The third port of the switch K1 is connected to one end of the second voltage divider unit, and the other end of the second voltage divider unit is connected to the main control chip U1. The second port of the switch K1 is connected to one end of the third voltage divider unit, and the other end of the third voltage divider unit is connected to the first pin of the main control chip U1. The first port of the switch K1 is connected to the first pin of the main control chip U1.
[0009] According to one embodiment of the present invention, the first light-emitting unit includes a switching transistor Q1 and a first light-emitting component. The gate of the switching transistor Q1 is connected to the PWMB interface of the main control chip U1, the drain of the switching transistor Q1 is connected to one end of the first light-emitting component, the source of the switching transistor Q1 is connected to the VIN interface of the main control chip U1, and the other end of the first light-emitting component is connected to the LED port.
[0010] According to one embodiment of the present invention, the second light-emitting unit includes a switching transistor Q2 and a second light-emitting component. The gate of the switching transistor Q2 is connected to the PWM interface of the main control chip U1, the drain of the switching transistor Q2 is connected to one end of the second light-emitting component, the source of the switching transistor Q2 is connected to the LED port, and the other end of the second light-emitting component is connected to the LED port.
[0011] According to one embodiment of the present invention, the first light-emitting component includes two first light-emitting elements, one end of each first light-emitting element is connected to the drain of the switching transistor Q1, and the other end of each first light-emitting element is connected to the LED port, and the two first light-emitting elements are connected in parallel.
[0012] According to one embodiment of the present invention, the second light-emitting component includes two second light-emitting elements, the negative electrode of each second light-emitting element is connected to the drain of the switching transistor Q2, the positive electrode of the second light-emitting element is connected to the LED port, and the two second light-emitting elements are connected in parallel.
[0013] According to one embodiment of the present invention, each first light-emitting element includes a plurality of first light-emitting diodes connected in series; each second light-emitting element includes a plurality of second light-emitting diodes connected in series, wherein the color temperatures of the first light-emitting diodes and the second light-emitting diodes are not the same.
[0014] According to one embodiment of the present invention, the first light-emitting unit further includes a first current-limiting component, one end of which is connected to the PWMB interface of the main control chip U1, and the other end of which is connected to the gate of the switching transistor Q1; the second light-emitting unit further includes a second current-limiting component, one end of which is connected to the PWM interface of the main control chip U1, and the other end of which is connected to the gate of the switching transistor Q2.
[0015] The beneficial effect of this invention is that, by changing the input voltage of the main control chip U1 through the voltage divider module, the main control chip U1 outputs PWM signals with different duty cycles to the light-emitting module according to different input voltages. The first and second light-emitting units of the light-emitting module switch their brightness according to the PWM signals, thereby changing the color of the mixed light emitted by the first and second light-emitting units. Attached Figure Description
[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:
[0017] Figure 1 This is a schematic diagram of the driving circuit for the adjustable color temperature linear light in the embodiment.
[0018] Figure 2 This is a schematic diagram of the light-emitting module in the embodiment.
[0019] Explanation of reference numerals in the attached figures
[0020] 1. First voltage regulator module; 2. Second voltage regulator module; 3. Voltage divider module; 31. First voltage divider unit; 32. Second voltage divider unit; 33. Third voltage divider unit; 4. Light-emitting module; 41. First light-emitting unit; 411. First light-emitting component; 412. First current limiter; 4111. First light-emitting component; 41111. First light-emitting diode; 42. Second light-emitting unit; 421. Second light-emitting component; 422. Second current limiter; 4211. Second light-emitting component; 42111. Second light-emitting diode. Detailed Implementation
[0021] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.
[0022] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0023] Please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the driving circuit for an adjustable color temperature linear light. Figure 2 This is a schematic diagram of the light-emitting module. This embodiment provides a driving circuit for an adjustable color temperature linear light, which has an LED- port and an LED+ port. The driving circuit for the adjustable color temperature linear light includes a first voltage regulator module 1, a second voltage regulator module 2, a voltage divider module 3, a main control chip U1, and a light-emitting module 4. The main control chip U1 has a VCC interface, a VIN interface, a GND interface, a PWMB interface, and a PWM interface. The output terminal of the first voltage regulator module 1 is connected to the input terminal of the second voltage regulator module 2, and the output terminal of the second voltage regulator module 2 is connected to the VCC interface of the main control chip U1. One end of the voltage divider module 3 is connected to the LED- port, and the other end is connected to the VCC interface of the main control chip. The light-emitting module 4 includes a first light-emitting unit 41 and a second light-emitting unit 42. One end of the first light-emitting unit 41 is connected to the PWMB interface of the main control chip U1, and the other end is connected to the LED+ port. One end of the second light-emitting unit 42 is connected to the PWM interface of the main control chip U1, and the other end is connected to the LED+ port. It should be noted that the LED+ port is the external voltage input port, and the LED- port is the negative terminal connection port.
[0024] In operation, the power supply voltage is input to the first voltage regulator module 1, which regulates the input voltage. Then, the first voltage regulator module 1 outputs a voltage to the second voltage regulator module 2, which linearly regulates the output voltage, resulting in the second voltage regulator module 2 outputting a rated voltage to power the main control chip U1. The voltage divider module 3 shuns the voltage output from the second voltage regulator module 2 by changing its switching state, thereby altering the input voltage of the main control chip U1. The main control chip U1 outputs complementary PWM signals with different duty cycles at the PWMB and PWM interfaces based on the input voltage, controlling the first and second light-emitting units 41 and 42 to change their light-emitting states, causing the light-emitting module 4 to emit light of different color temperatures. Thus, by changing the input voltage of the main control chip U1 through the voltage divider module 3, the main control chip U1 outputs PWM signals with different duty cycles to the light-emitting module 4 based on different input voltages. The first light-emitting unit 41 and the second light-emitting unit 42 of the light-emitting module 4 switch their brightness according to the PWM signal, thereby changing the color of the mixed light emitted by the first light-emitting unit 41 and the second light-emitting unit 42. Preferably, in this embodiment, the main control chip U1 is a constant voltage and constant current control chip of model Tongjia LD8115A.
[0025] Furthermore, the first voltage regulator module 1 includes a resistor R3, a transistor Q3, a Zener diode D1, and a capacitor C1. One end of resistor R3 is connected to the LED-port and the collector of transistor Q3, while the other end is connected to the base of transistor Q3 and the cathode of Zener diode D1. The emitter of transistor Q3 is connected to one end of capacitor C1 and the input terminal of the second voltage regulator module 2. The other end of capacitor C1 is connected to the anode of Zener diode D1 and the LED-port.
[0026] The second voltage regulator module 2 includes a Zener transistor Q4 and a capacitor C2. The input terminal of the Zener transistor Q4 is connected to the output terminal of the first voltage regulator module 1, and the ground terminal of the Zener transistor Q4 is connected to the LED port. The output terminal of the Zener transistor Q4 is connected to the VCC interface of the main control chip U4. The capacitor C2 is connected in parallel between the output terminal of the Zener transistor Q4 and the ground terminal.
[0027] The input terminal of Zener transistor Q4 receives the output voltage of the first voltage regulator module 1. Zener transistor Q4 stabilizes the voltage output by the first voltage regulator module 1 to the rated value and outputs the rated value to the main control chip U1. Capacitor C2 is used for energy storage.
[0028] Voltage divider module 3 includes switch K1, a first voltage divider unit 31, a second voltage divider unit 32, and a third voltage divider unit 33. Switch K1 has a first port through a sixth port. The sixth port of switch K1 is connected to the LED port. The fifth port of switch K1 is connected to one end of the first voltage divider unit 31, and the other end of the first voltage divider unit 31 is connected to the VCC interface of the main control chip U1. The fourth port of switch K1 is connected to the VIN interface of the main control chip U1. The third port of switch K1 is connected to one end of the second voltage divider unit 32, and the other end of the second voltage divider unit 32 is connected to the VCC interface of the main control chip U1. The second port of switch K1 is connected to one end of the third voltage divider unit 33, and the other end of the third voltage divider unit 33 is connected to the VCC interface of the main control chip U1. The first port of switch K1 is connected to the VCC interface of the main control chip U1.
[0029] In actual circuit use, by turning on the fifth, third, or second port of switch K1, the first voltage divider unit 31, the second voltage divider unit 32, or the third voltage divider unit 33 is turned on and connected to the circuit. This allows the voltage divider units to divide the input voltage of the main control chip U1 by changing the resistance value, thereby changing the voltage value of the input voltage of the main control chip U1.
[0030] The first light-emitting unit 41 includes a switching transistor Q1 and a first light-emitting component 411. The gate of the switching transistor Q1 is connected to the PWMB interface of the main control chip U1, the source of the switching transistor Q1 is connected to the VIN interface of the main control chip U1, and the drain of the switching transistor Q1 is connected to the negative terminal of the first light-emitting component 411. The positive terminal of the first light-emitting component 411 is connected to the LED port. The switching transistor Q1 is used to receive the PWM signal sent by the PWMB interface of the main control chip U1. The switching transistor Q1 changes its on / off state according to the PWMB signal, thereby controlling the light-emitting or off state of the first light-emitting component 411.
[0031] In addition, the first light-emitting unit 41 also includes a first current-limiting component 412. One end of the first current-limiting component 412 is connected to the PWMB interface of the main control chip U1, and the other end is connected to the gate of the switching transistor Q1. In this example, the first current-limiting component 412 includes a resistor R1. One end of the resistor R1 is connected to the PWMB interface of the main control chip U1, and the other end is connected to the gate of the switching transistor Q1. During use, the PWM signal emitted by the PWMB interface of the main control chip U1 is current-limited and then output to the switching transistor Q1 to protect the switching transistor Q1.
[0032] Furthermore, the first light-emitting component 411 includes two sets of first light-emitting elements 4111, which are connected in parallel. One end of each set of first light-emitting elements 4111 is connected to the drain of the switching transistor Q1, and the other end of the first light-emitting element 4111 is connected to the LED port.
[0033] The second light-emitting unit 42 includes a switching transistor Q2 and a second light-emitting component 421. The gate of the switching transistor Q2 is connected to the PWM interface of the main control chip U1, the drain of the switching transistor Q2 is connected to one end of the second light-emitting component 421, and the source of the switching transistor Q2 is connected to the LED port. The other end of the second light-emitting component 421 is connected to the LED port.
[0034] The gate of the switching transistor Q2 is used to receive the PWM signal sent by the PWM interface of the control chip U1, and changes the on / off state of the switching transistor Q2 according to the PWM signal, thereby controlling the light-emitting or off state of the second light-emitting component 421.
[0035] The second light-emitting unit 42 also includes a second current-limiting element 422. One end of the second current-limiting element 422 is connected to the PWM interface of the main control chip U1, and the other end is connected to the gate of the switching transistor Q2. In this example, the second current-limiting element 422 includes a resistor R2. One end of the resistor R2 is connected to the PWM interface of the main control chip U1, and the other end is connected to the gate of the switching transistor Q2. The second current-limiting element 422 is used to prevent excessive current output from the PWM interface of the main control chip U1 from damaging the switching transistor Q2.
[0036] The second light-emitting component 421 includes two sets of second light-emitting elements 4211, which are connected in parallel. The negative terminal of each set of second light-emitting elements 4211 is connected to the drain of the switching transistor Q2, and the positive terminal of the second light-emitting element 4211 is connected to the LED port.
[0037] Furthermore, each group of first light-emitting elements 4111 includes multiple first light-emitting diodes 41111 connected in series. The negative terminals of these multiple first light-emitting diodes 41111 are connected to the drain of the switching transistor Q1, and their positive terminals are connected to the LED-port. Each group of second light-emitting elements 4211 includes multiple second light-emitting diodes 42111 connected in series. The negative terminals of these multiple second light-emitting diodes 42111 are connected to the drain of the switching transistor Q2, and their positive terminals are connected to the LED-port. The first light-emitting diodes 41111 and the second light-emitting diodes 42111 have different color temperatures. In this example, the color temperature of the first light-emitting diode 41111 is 5K, and the color temperature of the second light-emitting diode 42111 is 2.7K. By setting the first light-emitting diode 41111 and the second light-emitting diode 42111 to different color temperatures, the mixed color of the first light-emitting element 4111 and the second light-emitting element 4211 can be changed by adjusting the brightness of the first light-emitting element 4111 and the second light-emitting element 4211 during actual use.
[0038] In summary, the first voltage regulator module 1 regulates the input power supply voltage, and the second voltage regulator module 2 linearly regulates the output voltage of the first voltage regulator module 1. The voltage divider module 3 shunts the output voltage of the second voltage regulator module 2 by changing its switching state, thereby changing the input voltage of the main control chip U1. The main control chip U1 outputs PWM signals with complementary duty cycles at the PWMB interface and the PWM interface respectively according to the input voltage, so as to control the first light-emitting unit 41 and the second light-emitting unit 42 to change their light-emitting state, so that the light-emitting module 4 emits light of different color temperatures.
[0039] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.
Claims
1. A driving circuit of a color temperature adjustable linear light, characterized in that, The application has LED- port and LED+ port, and further comprises first voltage stabilizing module (1), second voltage stabilizing module (2), voltage dividing module (3), main control chip U1 and light emitting module (4); the output end of the first voltage stabilizing module (1) is connected with the input end of the second voltage stabilizing module (2), the output end of the second voltage stabilizing module (2) is connected with the VCC interface of the main control chip U1; one end of the voltage dividing module (3) is connected with the LED- port, and the other end is connected with the VCC interface of the main control chip U1; the light emitting module (4) comprises first light emitting unit (41) and second light emitting unit (42), one end of the first light emitting unit (41) is connected with the PWMB interface of the main control chip U1, and the other end is connected with the LED+ port, one end of the second light emitting unit (42) is connected with the PWM interface of the main control chip U1, and the other end is connected with the LED+ port.
2. The driving circuit of a color temperature tunable line light according to claim 1, characterized in that, The first voltage stabilizing module (1) comprises resistance R3, triode Q3, voltage stabilizing diode D1 and capacitor C1; one end of the resistance R3 is connected with the LED- port and the collector of the triode Q3 respectively, and the other end is connected with the base of the triode Q3 and the negative electrode of the voltage stabilizing diode D1 respectively; the emitter of the triode Q3 is connected with one end of the capacitor C1 and the input end of the second voltage stabilizing module (2) respectively, and the other end of the capacitor C1 is connected with the positive electrode of the voltage stabilizing diode D1 and the LED- port respectively.
3. The driving circuit of a color temperature tunable line light according to claim 1, characterized in that, The second voltage stabilizing module (2) comprises voltage stabilizing triode Q4 and capacitor C2, the input end of the voltage stabilizing triode Q4 is connected with the output end of the first voltage stabilizing module (1), the grounding end of the voltage stabilizing triode Q4 is connected with the LED- port, the output end of the voltage stabilizing triode Q4 is connected with the VCC interface of the main control chip U1, and the capacitor C2 is connected in parallel with the output end and the grounding end of the voltage stabilizing triode Q4.
4. The drive circuit for a color temperature adjustable line light according to claim 1, characterized in that, The voltage dividing module (3) comprises switch K1, first voltage dividing unit (31), second voltage dividing unit (32) and third voltage dividing unit (33), the switch K1 has first port to sixth port, the sixth port of the switch K1 is connected with the LED- port, the fifth port of the switch K1 is connected with one end of the first voltage dividing unit (31), and the other end of the first voltage dividing unit (31) is connected with the first pin of the main control chip U1; the fourth port of the switch K1 is connected with the third pin of the main control chip U1, the third port of the switch K1 is connected with one end of the second voltage dividing unit (32), the other end of the second voltage dividing unit (32) is connected with the VCC interface of the main control chip U1, the second port of the switch K1 is connected with one end of the third voltage dividing unit (33), the other end of the third voltage dividing unit (33) is connected with the first pin of the main control chip U1, and the first port of the switch K1 is connected with the first pin of the main control chip U1.
5. The drive circuit for a color temperature adjustable line light according to claim 1, characterized in that, The first light-emitting unit (41) comprises a switch tube Q1 and a first light-emitting component (411), a gate of the switch tube Q1 is connected to a PWMB interface of the master control chip U1, a drain of the switch tube Q1 is connected to one end of the first light-emitting component (411), a source of the switch tube Q1 is connected to a third pin VIN interface of the master control chip U1, and the other end of the first light-emitting component (411) is connected to an LED port.
6. The driving circuit of a color temperature tunable line light according to claim 5, characterized in that, The second light-emitting unit (42) comprises a switch tube Q2 and a second light-emitting component (421), a gate of the switch tube Q2 is connected to a PWM interface of the master control chip U1, a drain of the switch tube Q2 is connected to one end of the second light-emitting component (421), a source of the switch tube Q2 is connected to the LED port, and the other end of the second light-emitting component (421) is connected to the LED port.
7. The driving circuit of a color temperature tunable line light according to claim 6, characterized in that, The first light-emitting component (411) comprises two first light-emitting pieces (4111), one end of each first light-emitting piece (4111) is connected to the drain of the switch tube Q1, the other end of each first light-emitting piece (4111) is connected to the LED port, and the two first light-emitting pieces (4111) are connected in parallel.
8. The driving circuit of a color temperature tunable line light according to claim 7, characterized in that, The second light-emitting component (421) comprises two second light-emitting pieces (4211), a negative electrode of each second light-emitting piece (4211) is connected to the drain of the switch tube Q2, a positive electrode of each second light-emitting piece (4211) is connected to the LED port, and the two second light-emitting pieces (4211) are connected in parallel.
9. The driving circuit of a color temperature tunable line light according to claim 8, characterized in that, Each first light-emitting piece (4111) comprises a plurality of first light-emitting diodes (41111) connected in series, each second light-emitting piece (4211) comprises a plurality of second light-emitting diodes (42111) connected in series, and the color temperature of the first light-emitting diodes (41111) is inconsistent with that of the second light-emitting diodes (42111).
10. The drive circuit for a color temperature adjustable line light according to claim 5, characterized in that, The first light-emitting unit (41) further comprises a first current-limiting piece (412), one end of the first current-limiting piece (412) is connected to the PWMB interface of the master control chip U1, and the other end of the first current-limiting piece (412) is connected to the gate of the switch tube Q1; the second light-emitting unit (42) further comprises a second current-limiting piece (422), one end of the second current-limiting piece (422) is connected to the PWM interface of the master control chip U1, and the other end of the second current-limiting piece (422) is connected to the gate of the switch tube Q2.