Lamp control circuit, method and system and lamp

Abstract

The invention relates to a control circuit, method and system of a lamp and the lamp, the lamp is provided with a first lamp group and a second lamp group, the two lamp groups emit light with different color temperatures, and the circuit comprises a color temperature adjusting module which is provided with a first current input end, a first current output end, a first connecting end, a second connecting end and a first control end; the brightness adjusting module is provided with a second current input end, a second current output end and a second control end, the first current input end is connected with the power supply, the first current output end is connected with the second current input end, and the second current output end is grounded; the first connecting end is connected with the current input end of the lamp, and the second connecting end is connected with the current output end of the lamp; the first control end is used for receiving a first control signal for controlling color temperature, and the second control end is used for controlling a second control signal of brightness; wherein the color temperature adjusting module is used for controlling the color temperature of the lamp; wherein the brightness adjusting module is used for controlling the brightness of the lamp.

Description

Technical Field

[0001] The present invention relates to LED lighting technology, and more particularly to a control circuit, method and system of a lamp and a lamp. Background Art

[0002] With the rapid development of LED lighting technology, LED light strips have been widely used in home lighting, commercial lighting, outdoor lighting and other fields due to their advantages such as energy saving, environmental protection and long life. The way to adjust the brightness and color temperature of two-color lamps on the market is usually to connect the lamp group with three-core wires, two of which are connected to the cold-color LED lamp and the warm-color LED lamp respectively, and the third wire is the power cord. Although this design can achieve the adjustment of color temperature and brightness, the three-core wire insertion method causes the cost of the lamp group to increase dramatically, lacking cost advantages. Summary of the invention

[0003] The present application provides a control circuit, method and system of a lamp and a lamp A control circuit of a lamp, wherein the lamp is provided with a first lamp group and a second lamp group, wherein the first lamp group emits light of a first color temperature, and the second lamp group emits light of a second color temperature, wherein the circuit comprises a color temperature adjustment module and a brightness adjustment module, wherein the color temperature adjustment module has a first current input terminal, a first current output terminal, a first connection terminal, a second connection terminal and a first control terminal; the brightness adjustment module has a second current input terminal, a second current output terminal and a second control terminal, wherein: The first current input terminal is connected to a power supply VCC, the first current output terminal is connected to the second current input terminal, and the second current output terminal is grounded; The first connection end is connected to the current input end of the lamp, and the second connection end is connected to the current output end of the lamp; The first control end is used to receive a first control signal for controlling the color temperature of the lamp, and the second control end is used to receive a second control signal for controlling the brightness of the lamp; Wherein, the color temperature adjustment module is used to control the color temperature of the lamp under the control of the first control signal; Wherein, the brightness adjustment module is used to control the brightness of the lamp under the control of the second control signal.

[0004] A lamp comprises a first lamp group and a second lamp group and the above-mentioned circuit, wherein the first lamp group emits light of a first color temperature, and the second lamp group emits light of a second color temperature.

[0005] A method for controlling a lamp is applied to the controller of the lamp described above, the method comprising: Receive lighting control signals; Generate a first control signal and a second control signal according to the lamp control signal; wherein the first control signal is used to control the color temperature of the lamp, and the second control signal is used to control the brightness of the lamp; The first control signal is sent to a color temperature adjustment module; and the second control signal is sent to a brightness adjustment module.

[0006] A lamp control system comprises a controller and the lamp as described above, wherein the controller controls the lamp using the method as described above.

[0007] In the embodiment of the present application, the color temperature of the first lamp group and the second lamp group is adjusted by a first control signal, and the overall brightness of the lamp is controlled by a second control signal, so that the control of color temperature and brightness is independent of each other, avoiding the problem of mutual influence between the two in the prior art, and improving the flexibility and accuracy of control.

[0008] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by implementing the present application. Other advantages of the present application can be realized and obtained by the schemes described in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are used to provide an understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0010] Figure 1 It is a structural schematic diagram of a control circuit of a two-color lamp in the related art; Figure 2 A schematic diagram of the structure of a control circuit 10 of a lamp provided in Embodiment 1 of the present application; Figure 3 A schematic diagram of the structure of a control circuit 10 of a lamp provided in Embodiment 2 of the present application; Figure 4 A schematic diagram of the structure of a control circuit 10 of a lamp provided in Embodiment 3 of the present application; Figure 5 A schematic diagram of the structure of a control circuit 10 of a lamp provided in the fourth embodiment of the present application; Figure 6 A schematic diagram of the structure of a control circuit 10 of a lamp provided in Embodiment 5 of the present application; Figure 7 A schematic diagram of the structure of a lamp 100 provided in Embodiment 6 of the present application; Figure 8 A schematic diagram of the structure of a lamp 100 provided in Embodiment 7 of the present application; Fig. 9This is an application schematic diagram of a lighting control system provided in Embodiment 8 of the present application; Fig.10 A flowchart of a method for controlling a lamp provided in Embodiment 9 of the present application; Fig.11 A schematic diagram of a voltage waveform for color temperature modulation provided in an embodiment of the present application; Fig.12 A schematic diagram of a voltage waveform for brightness modulation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0011] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0012] The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in the present application may also be combined with any conventional features or elements to form a unique invention scheme. Any features or elements of any embodiment may also be combined with features or elements from other invention schemes to form another unique invention scheme. Therefore, it should be understood that any feature shown and / or discussed in the present application may be implemented individually or in any appropriate combination. Therefore, except for the limitations made according to the attached claims and their equivalents, the embodiments are not subject to other restrictions. In addition, various modifications and changes may be made within the scope of protection of the attached claims.

[0013] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps of the specific order described. As will be understood by those of ordinary skill in the art, other sequences of steps are also possible. Therefore, the specific sequence of the steps set forth in the specification should not be interpreted as a limitation to the claims. In addition, the claims for the method and / or process should not be limited to the steps of performing them in the order written, and those skilled in the art can easily understand that these sequences can be changed and still remain within the spirit and scope of the embodiments of the present application.

[0014] In LED lamps, the proportion of the lighting and extinguishing time of the LED lamps is controlled by changing the duty cycle of the PWM signal, thereby adjusting its brightness. Different PWM dimming controls are performed on LED lamps with different color temperatures to adjust their color temperature.

[0015] Among them, color temperature is the most common indicator of the quality of the light source spectrum, which is expressed in Kelvin temperature (K). For example, the color temperature of incandescent lamps is generally 2700K-3000K, and the light emitted is yellowish; while the color temperature of natural daylight is about 5500K-6000K, and the light color is white.

[0016] For example, in a lamp that contains both cool white and warm white LEDs, increasing the duty cycle of the cool white LED will make it light up longer and brighter, and the overall color temperature will increase; conversely, increasing the duty cycle of the warm white LED will reduce the overall color temperature. Figure 1 FIG. 1 is a schematic diagram of a control circuit for a two-color lamp in the related art. Figure 1 As shown, the circuit includes a low color temperature lamp group LED_A, a high color temperature lamp group LED_B, a switch tube Q_A, a switch tube Q_B, a resistor RA, a resistor RB and a controller J; wherein: The low color temperature lamp group LED_A includes M low color temperature LED light sources connected in series, wherein the input end of the first low color temperature LED light source LED_A1 is connected to the power supply VCC, and the output end of the mth low color temperature LED light source LED_Am is grounded GND via the resistor RA and the switch tube Q_A; wherein the resistor RA is used to limit the current flowing through the low color temperature lamp group LED_A to protect the low color temperature lamp group LED_A from being damaged by excessive current; the control end of the switch tube Q_A is controlled by the PWM1 signal output by the controller J through pin 1, wherein the PWM1 signal is used for the brightness and color temperature of the low color temperature lamp group LED_A; wherein m is a positive integer.

[0017] The high color temperature lamp group LED_B includes M high color temperature LED light sources connected in series, wherein the input end of the first high color temperature LED light source LED_B1 is connected to the power supply VCC, and the output end of the mth high color temperature LED light source LED_Bm is connected to the ground GND via the resistor RB and the switch tube Q_B; wherein the resistor RB is used to limit the current flowing through the high color temperature lamp group LED_B to protect the high color temperature lamp group LED_B from being damaged by excessive current; the control end of the switch tube Q_B is controlled by the PWM1 signal output by the controller J through the pin 2, wherein the PWM2 signal is used for the brightness and color temperature of the high color temperature lamp group LED_B; Among them, pin 3 of the controller is used as GND, and the switch tube Q_A and the switch tube Q_B are grounded; pin 4 of the controller J is used as the voltage connection terminal of the controller and is connected to the output terminal of the power supply VCC.

[0018] from Figure 1 From the structure shown, it can be seen that the controller needs to control the two-color lamp through three control lines, two of which are connected to the low color temperature lamp group LED_A and the high color temperature lamp group LED_B respectively, and the third line is the power supply pin of the controller, which is connected to the power supply VCC. Among them, the controller J can use the PWM1 signal and the PWM2 signal to independently dim the low color temperature lamp group LED_A and the high color temperature lamp group LED_B.

[0019] In the process of implementing this application, it was found Figure 1 The structure shown has the following problems, including: Using the three-core two-way PWM control method will increase the cost of the lamp set because more connecting wires and components are required, and the circuit cost is higher; Each PWM signal needs to control the color temperature and brightness of each light group at the same time. It is necessary to accurately control the PWM value of the color temperature ratio, and on this basis, synchronously modulate the PWM1 signal and PWM2 signal to achieve brightness changes of the light group at a fixed color temperature. The algorithm complexity is too high.

[0020] against Figure 1 To overcome the technical defects of the structure shown in the figure, the embodiment of the present application proposes a new control scheme, which reduces the circuit cost and simplifies the control logic by reducing the number of control lines and optimizing the PWM signal control algorithm.

[0021] Embodiment 1 Figure 2 This is a schematic diagram of the structure of the control circuit 10 of the lamp provided in the first embodiment of the present application. Figure 2 As shown, the lamp is provided with a first lamp group 20 and a second lamp group 30, and the two lamp groups emit light of different color temperatures, for example, the first lamp group 20 emits light of a first color temperature, and the second lamp group 30 emits light of a second color temperature. The first color temperature is a low color temperature (e.g., warm color), and the second color temperature is a high color temperature (e.g., cool color).

[0022] The circuit includes a color temperature adjustment module 11 and a brightness adjustment module 12, wherein the color temperature adjustment module 11 has a first current input terminal IN1, a first current output terminal OUT1, a first connection terminal J1, a second connection terminal J2 and a first control terminal K1; the brightness adjustment module 12 has a second current input terminal IN2, a second current output terminal OUT2 and a second control terminal K2, wherein: The first current input terminal IN1 is connected to the power supply VCC, the first current output terminal OUT1 is connected to the second current input terminal IN2, and the second current output terminal OUT2 is grounded; The first connection terminal J1 is connected to the current input terminal of the lamp, and the second connection terminal J2 is connected to the current output terminal of the lamp; The first control terminal K1 is used to receive a first control signal C1 for controlling the color temperature of the lamp, and the second control terminal K2 is used to receive a second control signal C2 for controlling the brightness of the lamp; exist Figure 2 In the structure shown, the color temperature adjustment module 11 is used to adjust the color temperature of the lamp under the control of the first control signal C1.

[0023] In one implementation, the color temperature adjustment module 11 can accurately control the light groups with different color temperatures by controlling the light groups with different color temperatures to conduct alternately, thereby achieving color temperature adjustment, that is, primary modulation of the lamps; wherein: By increasing the on-time of the first lamp group 20 and reducing the on-time of the second lamp group 30, the color temperature of the lamp group can be reduced; by reducing the on-time of the first lamp group 20 and increasing the on-time of the second lamp group 30, the color temperature of the lamp group can be increased.

[0024] exist Figure 2 In the structure shown, the brightness adjustment module 12 is used to control the brightness of the lamp under the control of the second control signal C2.

[0025] In one implementation, the brightness adjustment module 12 adjusts the brightness of the light source in the LED light source by controlling the on-off of the entire circuit, that is, the secondary modulation of the lamp; wherein: When the first lamp group 20 is on, the brightness of the first lamp group 20 can be adjusted by changing the on time of the brightness adjustment module 12. If the on time of the brightness adjustment module 12 is increased, the first lamp group 20 will be brighter; if the on time of the brightness adjustment module 12 is reduced, the first lamp group 20 will be dimmer.

[0026] Similarly, when the second lamp group 30 is on, the brightness of the second lamp group 30 can be adjusted by changing the on-time of the brightness adjustment module 12. If the on-time of the brightness adjustment module 12 is increased, the second lamp group 30 will be brighter; if the on-time of the brightness adjustment module 12 is reduced, the second lamp group 30 will be dimmer.

[0027] In summary, Figure 2 The structure shown achieves independent control of color temperature and brightness through the combination of brightness modulation and color temperature modulation, providing a more flexible lighting solution.

[0028] Embodiment 2 In the second embodiment, the circuit structure is similar to that of the first embodiment, except that the color temperature adjustment module 11 includes a first color temperature adjustment unit 11A corresponding to the first lamp group 20 and a second color temperature adjustment unit 11B corresponding to the second lamp group 30; wherein: The first color temperature adjustment unit 11A is used to control the first lamp group 20 to be turned on and off under the control of the first control signal C1; The second color temperature adjustment unit 11B is used to control the on and off of the second lamp group 30 under the control of the first control signal C1.

[0029] Figure 3 This is a schematic diagram of the structure of the control circuit 10 of the lamp provided in the second embodiment of the present application. Figure 3 As shown, the first connection terminal J1 has a connection terminal J1A connected to the current input terminal of the first lamp group 20 and a connection terminal J1B connected to the current input terminal of the second lamp group 30, and the second connection terminal has a connection terminal J2A connected to the current output terminal of the first lamp group 20 and a connection terminal J2B connected to the current input terminal of the second lamp group 30; wherein: The first color temperature adjustment unit 11A is connected to the current input end of the first lamp group 20 through the connection end J1A, and is connected to the current output end of the first lamp group 20 through the connection end J2A; The second color temperature adjustment unit 11B is connected to the current input end of the second lamp group 30 via the connection end J1B, and is connected to the current output end of the second lamp group 30 via the connection end J2B.

[0030] When the first color temperature adjustment unit 11A outputs current through the connection terminal J1A, the current flows to the current input terminal of the first lamp group 20 and lights up the LED light source of the first lamp group 20, and then flows to the first current output terminal OUT1 through the connection terminal J2A, and finally returns to GND through the brightness adjustment module, thereby realizing the conduction of the first lamp group 20.

[0031] Similarly, when the second color temperature adjustment unit 11B outputs current through the connection terminal J1B, the current flows to the current input terminal of the second lamp group 30 and lights up the LED light source of the second lamp group 30, and then flows to the first current output terminal OUT1 through the connection terminal J2B, and finally returns to GND through the brightness adjustment module, thereby realizing the conduction of the second lamp group 30.

[0032] From the above content, it can be known that by alternately turning on the respective lamp groups by the first color temperature adjustment unit 11A and the second color temperature adjustment unit 11B, the respective corresponding lamp groups can be accurately controlled to achieve color temperature adjustment of the light source in the lamp.

[0033] Figure 3 The structure shown achieves independent control of color temperature and brightness through the combination of brightness modulation and color temperature modulation, providing a more flexible lighting solution. In addition, the first color temperature adjustment unit 11A and the second color temperature adjustment unit 11B are used to independently control the two light groups, thereby improving the accuracy of color temperature control.

[0034] Embodiment 3 In the third embodiment, the working principle of the circuit is the same as that of the first and second embodiments, except that the circuit 10 includes switch tubes Q1, Q2, Q3, Q4 and Q5, which are used to implement the color temperature adjustment module 11 and the brightness adjustment module 12.

[0035] Specifically, the first color temperature adjustment unit 11A includes a switch tube Q1 and a switch tube Q4; the second color temperature adjustment unit 11B includes a switch tube Q2 and a switch tube Q3; and the brightness adjustment module includes a switch tube Q5.

[0036] Figure 4 This is a schematic diagram of the structure of the control circuit 10 of the lamp provided in the third embodiment of the present application. Figure 4 As shown, the input end in of the switch tube Q1 and the input end in of the switch tube Q3 are both connected to the output end of the power supply VCC; The output end out of the switch tube Q1 is connected to the positive electrode of the first lamp group 20, and the negative electrode of the first lamp group 20 is connected to the input end in of the switch tube Q4, so that the output end out of the switch tube Q1 is connected to the input end in of the switch tube Q4 through the first lamp group 20; The output end out of the switch tube Q3 is connected to the positive electrode of the second lamp group 30, and the negative electrode of the second lamp group 30 is connected to the input end in of the switch tube Q2, so that the output end out of the switch tube Q3 is connected to the input end in of the switch tube Q2 through the second lamp group 30; The output end out of the switch tube Q2 and the output end out of the switch tube Q4 are both connected to the input end in of the switch tube Q5, wherein the output end out of the switch tube Q5 is grounded; exist Figure 4 In the structure shown, the switch tubes Q1 , Q2 , Q3 and Q4 form an H-bridge circuit for adjusting the color temperature of the lamp.

[0037] In the H-bridge circuit, the upper switch is used to connect the positive pole (VCC) of the power supply and the load. By controlling the on and off of the upper switch, the current can be controlled to flow from the positive pole of the power supply to the load; the lower switch is used to connect the load and the negative pole or ground (GND) of the power supply. By controlling the on and off of the lower switch, the current can be controlled to flow from the load to the negative pole of the power supply. By alternately turning on the switch tubes on the diagonal of the H-bridge (i.e., one upper switch and one lower switch), a voltage can be generated across the load, thereby controlling the operating state of the load.

[0038] exist Figure 4In the structure shown, the switch tube Q1 and the switch tube Q3 are used as the upper switch tubes in the H-bridge circuit; the switch tube Q2 and the switch tube Q4 are used as the lower switch tubes in the H-bridge circuit; the output end of the power supply VCC is the positive pole of the power supply, and the loads are the first lamp group 20 and the second lamp group 30. The switch tubes Q2 and Q4, which are used as the lower switch tubes, are connected to GND through the switch tube Q5.

[0039] exist Figure 4 In the structure shown, by controlling the on and off of the switch tubes on the diagonal lines of the H-bridge that are alternately turned on, the lamp groups with different color temperatures can be precisely controlled to achieve color temperature adjustment. The on and off of the switch tubes on the diagonal lines of the H-bridge are controlled by the first control signal C1, that is, the control end k of the switch tube Q1, the control end k of the switch tube Q2, the control end k of the switch tube Q3, and the control end k of the switch tube Q4 are used to receive their respective first control signals C1, wherein the first control signal C1 is used to control the color temperature of the lamp.

[0040] Specifically, when the switch tube Q1 and the switch tube Q4 are turned on, the current flows from the output end of the power supply VCC to the lamp beads of the first lamp group 20 through the switch tube Q1, then flows to the switch tube Q5 through the switch tube Q4, and finally returns to GND, thereby realizing the conduction of the first lamp group 20. When the switch tube Q2 and the switch tube Q3 are turned on, the current flows from the output end of the power supply VCC to the lamp beads of the second lamp group 30 through the switch tube Q3, then flows to the switch tube Q5 through the switch tube Q2, and finally returns to GND, thereby realizing the conduction of the second lamp group 30.

[0041] From the above content, it can be seen that by controlling the on and off of the switch tubes on the diagonal line of the alternately conducting H bridge, it is possible to accurately control the lamp groups with different color temperatures and achieve color temperature adjustment of the light source in the lamp, that is, primary modulation of the lamp.

[0042] exist Figure 4 In the structure shown, the switch tube Q5 is used to adjust the brightness of the lamp. When the first lamp group 20 is lit, current flows out from the output end of the power supply VCC, passes through the switch tube Q1 and the first lamp group 20, and then returns to GND through the switch tube Q4 to form a loop. In this process, the switch tube Q5 can be used to adjust the brightness of the first lamp group 20. By changing the conduction time of the switch tube Q5, the brightness of the first lamp group 20 can be adjusted. If the duty cycle of the switch tube Q5 increases, the first lamp group 20 will be brighter; if the duty cycle of the switch tube Q5 decreases, the first lamp group 20 will become dimmer.

[0043] When the second lamp group 30 is lit, the current flows out from the output end of the power supply VCC, passes through the switch tube Q3 and the second lamp group 30, and then returns to GND through the switch tube Q2 to form a loop. In this process, the switch tube Q5 can be used to adjust the brightness of the second lamp group 30. By changing the conduction time of the switch tube Q5, the brightness of the second lamp group 30 can be adjusted. If the duty cycle of the switch tube Q5 increases, the second lamp group 30 will be brighter; if the duty cycle of the switch tube Q5 decreases, the second lamp group 30 will become dimmer.

[0044] From the above content, it can be seen that the role of the switch tube Q5 in the circuit is to control the current flow of the entire circuit by adjusting its conduction time, thereby achieving the adjustment of the light source brightness in the LED light source, that is, the secondary modulation of the lamp.

[0045] In practical applications, the control strategy of the switch tube Q5 needs to be synchronized with the PWM signal of the main control system to ensure that the color temperature and brightness can be adjusted accurately and smoothly. In this way, a continuous dimming effect without flicker can be achieved, improving the lighting comfort and energy saving effect.

[0046] In summary, Figure 4 The structure shown achieves independent control of color temperature and brightness through the combination of brightness modulation and color temperature modulation, providing a more flexible lighting solution.

[0047] Embodiment 4 In the fourth embodiment, the structure of the circuit is similar to that of the third embodiment, except that at least one of the switch tube Q1, the switch tube Q2, the switch tube Q3, the switch tube Q4 and the switch tube Q5 is a MOS tube.

[0048] Figure 5 This is a schematic diagram of the structure of the control circuit 10 of the lamp provided in the fourth embodiment of the present application. Figure 5 As shown, the switch tube Q1 and the second switch tube Q3 are both PMOS tubes, and the switch tube Q2, the switch tube Q4 and the switch tube Q5 are all NMOS tubes.

[0049] In an H-bridge circuit, PMOS and NMOS transistors are usually used in pairs to achieve forward and reverse bidirectional driving of the load (i.e., the first lamp group 20 and the second lamp group 30). Among them, the PMOS transistor is usually used for high-end driving (the node connected to the power supply VCC), while the NMOS transistor is used for low-end driving (the node connected to the ground GND).

[0050] Figure 5 The structure shown achieves independent control of color temperature and brightness through the combination of brightness modulation and color temperature modulation, providing a more flexible lighting solution.

[0051] In addition, using MOS tubes as the switch unit in the circuit 10 has the following advantages, including: 1. Fast switching speed: The fast switching speed ensures that the lamp group can respond quickly and achieve smooth color temperature transition and brightness adjustment.

[0052] 2. Small driving current: No additional high-power driving circuit is required, which reduces the complexity and cost of the system.

[0053] 3. Relatively high withstand voltage: Even if the power supply voltage fluctuates to a certain extent, the MOS tube can still work reliably to ensure the stability and life of the lamp group.

[0054] 4. Small on-resistance: Small on-resistance ensures that the lamp group can obtain sufficient current and voltage to achieve efficient light emission. At the same time, lower power loss also reduces the heat of the MOS tube itself and prolongs its service life.

[0055] 5. High integration: It can be integrated in a smaller area, so that the volume of the entire circuit 10 can be reduced, and it is easy to install in various lighting equipment, such as bathroom mirror lights, etc.

[0056] 6. Low cost: reduce the hardware cost of components and improve the cost performance of products.

[0057] Embodiment 5 In the fifth embodiment, the structure of the circuit is similar to that of the third embodiment, except that the circuit 10 further includes a current limiting resistor R.

[0058] Figure 6 This is a schematic diagram of the structure of the control circuit 10 of the lamp provided in the fifth embodiment of the present application. Figure 6 As shown, in one implementation, one end of the current limiting resistor R is connected to the output end out of the switch tube Q1, and the other end is connected to the positive electrode of the first lamp group 20 and the negative electrode of the second lamp group 30 respectively.

[0059] In another implementation, one end of the current limiting resistor R is connected to the output end out of the switch tube Q3, and the other end is connected to the cathode of the first lamp group 20 and the anode of the second lamp group 30 respectively.

[0060] Figure 6 The structure shown realizes independent control of color temperature and brightness through the combination of brightness modulation and color temperature modulation, providing a more flexible lighting solution. In addition, by setting the current limiting resistor R, the current flowing through the first lamp group 20 and the second lamp group 30 can be limited to protect the first lamp group 20 and the second lamp group 30 from being damaged by excessive current.

[0061] Embodiment 6 Figure 7This is a schematic diagram of the structure of the lamp 100 provided in the sixth embodiment of the present application. Figure 7 As shown, the lamp 100 includes a first lamp group 20, a second lamp group 30 and the circuit 10 described above, wherein the first lamp group 20 emits light of a first color temperature, and the second lamp group 30 emits light of a second color temperature.

[0062] exist Figure 7 In the structure shown, the circuit 10 uses the H-bridge circuit composed of switch tubes Q1 to Q4 to perform primary modulation to control the color temperature of the first lamp group 20 and the second lamp group 30, and uses the switch tube Q5 to control the brightness of the first lamp group 20 and the second lamp group 30, so as to achieve the purpose of controlling the color temperature and brightness of the lamp 100 by two-stage modulation, which not only simplifies the circuit design and reduces the cost, but also improves the flexibility and accuracy of control. By dividing the color temperature and brightness modulation into two stages, the primary stage modulates the color temperature and the secondary stage modulates the brightness, the logic of the program algorithm control is clearer and the control is simpler.

[0063] Embodiment 7 In the seventh embodiment, the structure of the lamp is similar to that of the sixth embodiment, except that the specific structure of the lamp assembly is improved.

[0064] Figure 8 This is a schematic diagram of the structure of the lamp 100 provided in Embodiment 7 of the present application. Figure 8 As shown, the first lamp group 20 includes N first LED light sources, and the second lamp group 30 includes N second LED light sources; wherein the first LED light sources emit light of a first color temperature, and the second LED light sources emit light of a second color temperature, wherein the nth first LED light source LED_1n is connected in anti-parallel with the nth second LED light source LED_2n, n=1,2,3,...,N, wherein N is a positive integer.

[0065] The anti-parallel connection refers to connecting the nth first LED light source LED_1n and the nth second LED light source LED_2n in parallel with opposite polarities. Specifically, the positive electrode of the nth first LED light source is connected to the negative electrode of the nth second LED light source, and the negative electrode of the nth first LED light source is connected to the positive electrode of the nth second LED light source. This connection method enables the two LED light sources to form a mutually reverse parallel relationship in the circuit.

[0066] Will Figure 8 The lamp structure shown is Figure 1 By comparing the lamp group structure shown in the figure, we can see that: Figure 1The structure of the lamp group shown is that LED light sources of the same color temperature are connected in series. This design is often used to simplify circuit design because all LEDs can be driven by the same power supply and the current is the same in all LEDs. However, the disadvantage of this design is that if any one LED fails (such as an open circuit), the entire series LED string will be affected, which may cause the entire LED string to fail to work.

[0067] In contrast, Figure 8 The light group structure shown is connected in anti-parallel. This implementation has the following technical advantages: 1. Independent control: The anti-parallel LED light sources can be controlled independently, which means that the overall color temperature and brightness can be adjusted by controlling different LED light sources. For example, different color temperatures can be mixed by controlling the on / off ratio of the first LED light source and the second LED light source in the second light group.

[0068] 2. Flexibility: The anti-parallel design allows for more flexible brightness and color temperature adjustment. By adjusting the duty cycle of different color temperature LEDs, finer brightness control can be achieved while maintaining the desired color temperature.

[0069] 3. Redundancy: If one LED light source fails, the other LED light source can still work, which improves the reliability of the system.

[0070] 4. Cost-effectiveness: Since only two wires are needed to control two different LED light sources, cost and complexity can be reduced, especially when multiple LED arrays are required.

[0071] 5. Visual comfort: By quickly switching LEDs of different color temperatures, smooth brightness and color temperature adjustments can be achieved at a frequency that is imperceptible to the human eye, providing a more comfortable visual experience.

[0072] 6. Easy to implement: By using an H-bridge circuit and a control signal generating circuit, precise control of the LED light source can be achieved without the need for a complex multi-channel driver.

[0073] In summary, Figure 8 The lamp group structure shown provides a cost-effective, flexible and reliable LED light source control solution, which is suitable for application scenarios that require precise adjustment of color temperature and brightness.

[0074] Embodiment 8 An embodiment of the present application provides a lamp control system, comprising a controller 200 and the lamp 100 described above; wherein the controller controls the color temperature and brightness of the lamp 100 .

[0075] Fig. 9This is a schematic diagram of the application of the lighting control system provided in the embodiment of the present application. Fig. 9 As shown, the lamp 100 is deployed with Figure 5 The circuit shown and Figure 8 In the lamp of the structure shown, the controller is connected to the switch tube Q1 through line D_1, connected to the switch tube Q4 through line D_2, connected to the switch tube Q3 through line G_1, connected to the switch tube Q2 through line G_2, and connected to the switch tube Q5 through line L_B. Among them, line D_1, line D_2, line G_1 and line G_2 all transmit the first control signal C1; line L_B transmits the second control signal C2.

[0076] Fig. 9 The lighting control system shown provides a cost-effective, flexible and reliable LED light source control solution, which is suitable for application scenarios that require precise adjustment of color temperature and brightness.

[0077] Embodiment 9 Fig.10 This is a flow chart of a method for controlling a lamp provided in Embodiment 9 of the present application. Fig.10 As shown, the method is applied to the controller 200 described above, and the method includes: Step 1001, receiving a lamp control signal; The lamp control signal may be received by a switch device matched with the lamp, for example, a lamp switch device connected by a line or a remote controller connected by a wireless connection.

[0078] For example, the lamp control signal can be used to control the current working mode of the lamp. Taking the lamp used in the bathroom scene as an example, the working mode of the lamp can be set according to the requirements of color temperature and brightness in different usage scenarios. For example, the working mode can be washing, skin care, defogging or daily use.

[0079] Step 1002: Generate a first control signal and a second control signal according to the lamp control signal; wherein the first control signal is used to control the color temperature of the lamp, and the second control signal is used to control the brightness of the lamp; Specifically, by parsing the lamp control signal, the currently required color temperature and brightness can be obtained, thereby generating a first control signal corresponding to the currently required color temperature and a second control signal corresponding to the currently required brightness. For example, the currently required color temperature and brightness are determined according to the current working mode in the lamp control signal.

[0080] and Figure 1 The control method of the structure shown is different. In the method provided in the embodiment of the present application, although two control signals are also provided, each control signal can simultaneously control the same working parameter (i.e., color temperature or brightness) of the two lamp groups, which is different from Figure 1 In the structure shown, one control signal controls two working parameters of the same lamp group.

[0081] Step 1003: Send the first control signal to the color temperature adjustment module; and send the second control signal to the brightness adjustment module.

[0082] The method provided in the embodiment of the present application utilizes a first control signal to control the color temperature of the first lamp group 20 and the second lamp group 30, and utilizes a second control signal to control the brightness of the first lamp group 20 and the second lamp group 30, so as to achieve the purpose of controlling the color temperature and brightness of the lamp 100 by two-stage modulation. By dividing the color temperature and brightness modulation into two levels, the first level modulates the color temperature, and the second level modulates the brightness, the logic of the program algorithm control is clearer and the control is simpler.

[0083] The method provided in the embodiment of the present application is described below: In an exemplary embodiment, the voltage value of the power supply VCC remains unchanged, and at least one of the first control signal and the second control signal is a PWM signal, wherein: In the first control signal, the duty cycle of the PWM signal is used to control the ratio of the conduction time between the first lamp group and the second lamp group in each color temperature modulation cycle to adjust the color temperature; In the second control signal, the duty cycle of the PWM signal is used to control the on-time of the lamp in each brightness modulation cycle to adjust the brightness; Each color temperature modulation cycle includes at least two brightness modulation cycles to achieve more precise control.

[0084] Specifically, in the first-level color temperature modulation process, taking the case where the first color temperature is less than the second color temperature as an example, when the lamp control signal indicates an increase in color temperature, the duty cycle of the PWM signal corresponding to the second lamp group in the first control signal is increased, and the duty cycle of the PWM signal corresponding to the first lamp group in the first control signal is reduced; when the lamp control signal indicates a decrease in color temperature, the duty cycle of the PWM signal corresponding to the first lamp group in the first control signal is increased, and the duty cycle of the PWM signal corresponding to the second lamp group in the first control signal is reduced.

[0085] Fig.11 Schematic diagram of voltage waveform for color temperature modulation provided in the embodiment of the present application. Fig.11 As shown, the voltage waveform is based on Fig. 9It is obtained by collecting at the connection point A in the shown structure. The primary color temperature modulation is achieved by controlling the conduction time ratio of the first lamp group 20 and the second lamp group 30. By changing the conduction time ratio of the two lamp groups, the color temperature change from warm color to cold color can be realized.

[0086] In Fig.11 In the shown waveform diagram, in Fig.11 In the shown waveform diagram, within each color temperature modulation period T, the conduction duration of the first lamp group 20 is t, and the conduction duration of the second lamp group 30 is T - t, where both T and t are greater than 0.

[0087] The controller 200 can achieve the alternating conduction of the first lamp group 20 and the second lamp group 30 by controlling the switching tubes Q1 to Q4 of the H - bridge circuit. By changing the ratio of t and T - t, different color temperature effects can be achieved. For example, when t > T - t, the conduction time of the first lamp group 20 is longer and the color temperature tends to be warm; when t < T - t, the conduction time of the second lamp group 30 is longer and the color temperature tends to be cold. In this way, continuous color temperature adjustment from warm color to cold color can be realized.

[0088] Specifically, during the secondary brightness modulation, when the lamp control signal indicates an increase in brightness, increase the duty cycle of the PWM signal in the second control signal; when the lamp control signal indicates a decrease in brightness, decrease the duty cycle of the PWM signal in the second control signal.

[0089] Fig.12 It is a schematic diagram of the voltage waveform of the brightness modulation provided by the embodiment of the present application. As Fig.12 shown, this voltage waveform is obtained by collecting at the connection point A in the Fig. 9 shown structure. The secondary brightness modulation is to further modulate the conduction time of the first lamp group 20 and the second lamp group 30 by controlling the switching state of the switch circuit Q5.

[0090] In Fig.12 In the shown waveform diagram, within each color temperature modulation period T, the PWM duty cycle of the first lamp group 20 after primary color temperature modulation is t / T, and after secondary brightness modulation, the PWM duty cycle becomes t / T×D; similarly, the PWM duty cycle of the second lamp group 30 after primary color temperature modulation is (T - t) / T, and after secondary brightness modulation, the PWM duty cycle is (T - t) / T×D.

[0091] The controller 200 can achieve fine adjustment of the brightness of the lamp 100 by adjusting the PWM duty cycle D of the switching tube Q5. For example, when the duty cycle D increases, the actual conduction time of the lamp 100 increases and the brightness becomes brighter; when the duty cycle D decreases, the actual conduction time of the lamp 100 decreases and the brightness becomes darker.

[0092] The role of the switch tube Q5 in the circuit 10 is to control the current flow of the entire circuit by adjusting its conduction time, thereby realizing secondary modulation of the brightness of the LED light source. This brightness modulation is performed on the basis of color temperature modulation, so that the entire system can independently control color temperature and brightness, providing a more flexible lighting solution.

[0093] In practical applications, the control strategy of the switch tube Q5 needs to be synchronized with the PWM signal of the main control system to ensure that the color temperature and brightness can be adjusted accurately and smoothly. In addition, the modulation frequency of the second control signal should be higher than the visual persistence time of the human eye to achieve a continuous dimming effect without flicker, improve the lighting comfort and energy saving effect.

[0094] The embodiment of the present application provides an efficient lamp control system, which realizes independent control of the color temperature and brightness of the lamp through an innovative two-level modulation method. The specific technical effects are as follows: Independent control of color temperature and brightness: The color temperature of the first and second light groups is adjusted by the first control signal, and the overall brightness of the lamp is controlled by the second control signal. This two-level modulation method makes the control of color temperature and brightness independent of each other, avoiding the problem of mutual influence between the two in the prior art, and improving the flexibility and accuracy of control.

[0095] Simplified circuit design: Using H-bridge circuit and single switch Q5 for brightness adjustment reduces the number and complexity of control circuits. Compared with traditional multi-channel control methods, this solution reduces circuit costs and improves system reliability and stability.

[0096] Improve system reliability: The anti-parallel LED light source design enhances system redundancy. Even if one LED light source fails, the other light sources can still work normally, avoiding the problem of single-point failure causing the entire lamp to fail in traditional series design.

[0097] Improve user experience: By quickly switching LED light sources with different color temperatures and combining them with high-frequency PWM modulation, a continuous dimming effect without flicker is achieved. This dimming method not only improves the lighting comfort, but also extends the service life of the lamp.

[0098] Easy to implement and expand: Using common PWM signal control and combining it with a simple H-bridge circuit makes the system easy to implement and integrate. At the same time, the solution can be flexibly adjusted according to different application scenarios and has good scalability and adaptability.

[0099] In summary, the embodiments of the present application provide a cost-effective, flexible and reliable LED lamp control solution, which is suitable for a variety of application scenarios that require precise adjustment of color temperature and brightness, and has significant technical advantages and broad application prospects.

[0100] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As is known to those skilled in the art, the term "computer storage medium" includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A control circuit of a lamp, the lamp being provided with a first lamp group and a second lamp group, wherein the first lamp group emits light of a first color temperature, and the second lamp group emits light of a second color temperature, wherein the circuit comprises a color temperature adjustment module and a brightness adjustment module, wherein the color temperature adjustment module comprises a first current input terminal, a first current output terminal, a first connection terminal, a second connection terminal and a first control terminal; the brightness adjustment module comprises a second current input terminal, a second current output terminal and a second control terminal, wherein: The first current input terminal is connected to a power supply VCC, the first current output terminal is connected to the second current input terminal, and the second current output terminal is grounded; The first connection end is connected to the current input end of the lamp, and the second connection end is connected to the current output end of the lamp; The first control end is used to receive a first control signal for controlling the color temperature of the lamp, and the second control end is used to receive a second control signal for controlling the brightness of the lamp; Wherein, the color temperature adjustment module is used to control the color temperature of the lamp under the control of the first control signal; Wherein, the brightness adjustment module is used to control the brightness of the lamp under the control of the second control signal.

2. The circuit according to claim 1, characterized in that The color temperature adjustment module includes a first color temperature adjustment unit corresponding to the first lamp group and a second color temperature adjustment unit corresponding to the second lamp group; wherein: The first color temperature adjustment unit is used to control the first lamp group to be turned on and off under the control of the first control signal; The second color temperature adjustment unit is used to control the turning on and off of the second lamp group under the control of the first control signal.

3. The circuit according to claim 2, characterized in that: The first color temperature adjustment unit includes a switch tube Q1 and a switch tube Q4; The second color temperature adjustment unit includes a switch tube Q2 and a switch tube Q3; The brightness adjustment module includes a switch tube Q5; in: The input end of the switch tube Q1 and the input end of the switch tube Q3 are both connected to the power supply VCC; The output end of the switch tube Q1 is connected to the positive electrode of the first lamp group, and the negative electrode of the first lamp group is connected to the input end of the switch tube Q4; The output end of the switch tube Q3 is connected to the positive electrode of the second lamp group, and the negative electrode of the second lamp group is connected to the input end of the switch tube Q2; The output end of the switch tube Q2 and the output end of the switch tube Q4 are both connected to the input end of the switch tube Q5, wherein the output end of the switch tube Q5 is grounded; The control end of the switch tube Q1, the control end of the switch tube Q2, the control end of the switch tube Q3 and the control end of the switch tube Q4 are used to receive respective first control signals, wherein the first control signal is used to control the color temperature of the lamp; The control end of the switch tube Q5 is used to receive a second control signal, wherein the second control signal is used to control the brightness of the lamp.

4. The circuit according to claim 3, characterized in that At least one of the switch tube Q1 , the switch tube Q2 , the switch tube Q3 , the switch tube Q4 , and the switch tube Q5 is a MOS tube.

5. The circuit according to claim 3, characterized in that The circuit also includes a current limiting resistor R, wherein: One end of the current limiting resistor R is connected to the output end of the switch tube Q1, and the other end is connected to the positive electrode of the first lamp group and the negative electrode of the second lamp group respectively; or, One end of the current limiting resistor R is connected to the output end of the switch tube Q3, and the other end is respectively connected to the cathode of the first lamp group and the anode of the second lamp group.

6. A lamp, comprising a first lamp group and a second lamp group and the circuit according to any one of claims 1 to 5, wherein the first lamp group emits light of a first color temperature, and the second lamp group emits light of a second color temperature.

7. The lamp according to claim 6, characterized in that: The first lamp group includes N first LED light sources, and the second lamp group includes N second LED light sources, wherein the first LED light sources emit light of a first color temperature, and the second LED light sources emit light of a second color temperature; wherein the nth first LED light source and the nth second LED light source are connected in anti-parallel, n=1,2,3,...,N, wherein N is a positive integer.

8. A method for controlling a lamp, applied to the controller of the lamp as claimed in claim 6 or 7, the method comprising: Receive lighting control signals; Generate a first control signal and a second control signal according to the lamp control signal; The first control signal is used to control the color temperature of the lamp, and the second control signal is used to control the brightness of the lamp; The first control signal is sent to a color temperature adjustment module; and the second control signal is sent to a brightness adjustment module.

9. The method according to claim 8, characterized in that: The voltage value of the power supply VCC remains unchanged, and at least one of the first control signal and the second control signal is a PWM signal, wherein: In the first control signal, the duty cycle of the PWM signal is used to control the ratio of the conduction time between the first lamp group and the second lamp group in each color temperature modulation cycle to adjust the color temperature; In the second control signal, the duty cycle of the PWM signal is used to control the on-time of the lamp in each brightness modulation cycle to adjust the brightness; Wherein, each color temperature modulation cycle includes at least two brightness modulation cycles.

10. The method according to claim 9, characterized in that: When the lamp control signal indicates to increase the brightness, increase the duty cycle of the PWM signal in the second control signal; When the lamp control signal indicates to reduce the brightness, the duty cycle of the PWM signal in the second control signal is reduced.

11. The method according to claim 9, characterized in that: The first color temperature is less than the second color temperature; wherein: When the lamp control signal indicates to increase the color temperature, increase the duty cycle of the PWM signal corresponding to the second lamp group in the first control signal, and reduce the duty cycle of the PWM signal corresponding to the first lamp group in the first control signal; When the lamp control signal indicates to reduce the color temperature, the duty cycle of the PWM signal corresponding to the first lamp group in the first control signal is increased, and the duty cycle of the PWM signal corresponding to the second lamp group in the first control signal is reduced.

12. A lighting control system, comprising a controller and the lighting as claimed in claim 6 or 7; wherein the controller is used to execute the method as claimed in any one of claims 8 to 11.

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