A dimming and color adjusting multi-step color temperature LED driving circuit and LED lamp

Abstract

This invention provides a multi-level LED driving circuit for dimming and color temperature adjustment, including a first LED group, a second LED group, and a color-tuning LED component. The first LED group is connected to the upper N-1 positions of a multi-level switch, and the second LED group is connected to the N-1 positions of the multi-level switch, where N is the total number of positions of the multi-level switch, and one of the positions connected to the first and second LED groups does not overlap. The second LED group is connected to the position overlapping with the first LED group through resistors of different resistance values. The color-tuning LED component is connected to the second lower position of the multi-level switch, and the remaining lower positions of the multi-level switch are connected to the negative terminal of electrolytic capacitor C1. The positive terminal of electrolytic capacitor C1 is connected to the positive terminals of the first LED group, the second LED group, and the color-tuning LED component. This invention also provides an LED lamp equipped with the driving circuit described above.

Description

Technical Field

[0001] This utility model relates to lighting devices, and more particularly to LED lamps. Background Technology

[0002] Existing technologies for achieving multiple color temperatures and dimming / color adjustment include MCU programming, complex circuitry, and reducing power efficiency for all color temperature levels. This results in drawbacks such as complex circuitry, low power efficiency, and high cost. This is especially problematic for products with high energy efficiency requirements, leading to the use of higher luminous efficacy light sources to correct system efficiency, further increasing the overall lamp cost. Utility Model Content

[0003] The main technical problem to be solved by this utility model is to provide a multi-level LED driver circuit with dimming and color adjustment without increasing the cost and design difficulty of switching, while solving the problem of reduced power efficiency of dimming and color adjustment circuits, making the product more likely to meet relevant energy efficiency standards and achieving the best cost performance of the whole machine.

[0004] To solve the above-mentioned technical problems, this utility model provides a dimming and color-adjusting multi-level color temperature LED driving circuit, including a first LED lamp group, a second LED lamp group and a color-adjusting LED component;

[0005] The first LED group is connected to the upper N-1 positions of a multi-position switch, and the second LED group is connected to the N-1 positions of the multi-position switch, where N is the total number of positions of the multi-position switch, and one of the positions connected to the first LED group and the second LED group is not overlapping; the second LED group is connected to the position overlapping with the first LED group through resistors of different resistance values; the color-adjusting LED component is connected to the second lower position of the multi-position switch, the remaining lower positions of the multi-position switch are connected to the negative terminal of electrolytic capacitor C1, and the positive terminal of electrolytic capacitor C1 is connected to the positive terminals of the first LED group, the second LED group, and the color-adjusting LED component.

[0006] In a preferred embodiment: the color-tuning LED assembly includes a color-tuning LED lamp group, a switching transistor Q1, a diode D1, a capacitor C2, and a resistor R5;

[0007] The switching transistor Q1 is connected between the negative terminal of the color-adjusting LED light group and the input terminal of the lower position of the multi-position switch. The output terminal of the lower position of the multi-position switch is connected to the negative terminal of electrolytic capacitor C1 through resistor R5. The control terminal of the switching transistor Q1 is connected to the negative terminal of electrolytic capacitor C1 through diode D1. Diode D1 is connected in parallel with capacitor C2. The control terminal of the switching transistor Q1 is also connected to the positive terminal of electrolytic capacitor C1 through resistor R6.

[0008] In a preferred embodiment: the electrolytic capacitor C1 is connected in parallel with the capacitor R1.

[0009] In a preferred embodiment: the first LED light group and the second LED light group are respectively connected to the upper second position of the multi-position switch via diodes.

[0010] In a preferred embodiment: the second LED light group is also connected to gears other than the first gear and the second gear via diodes.

[0011] In a preferred embodiment: the first LED light group is also connected to gears other than the second gear and the Nth gear via diodes.

[0012] This utility model also provides an LED lamp equipped with the driving circuit described above.

[0013] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0014] This utility model provides a multi-level LED driver circuit for dimming and color adjustment, which adopts the double-pole multi-level switch used in the original multi-level color temperature circuit without increasing the cost and design difficulty of the switch. At the same time, it solves the problem of reduced power efficiency in dimming and color adjustment circuits, making the product more likely to meet relevant energy efficiency standards and achieving the best overall cost performance. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the preferred embodiment 1 of the present invention;

[0016] Figure 2 This is a circuit diagram of the preferred embodiment 2 of the present invention;

[0017] Figure 3 The circuit diagram of the preferred embodiment 3 of this utility model Detailed Implementation

[0018] To make the technical solution and features of this utility model clearer, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific examples. It should be understood that these examples are only for illustrating this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model by those skilled in the art in various equivalent forms fall within the scope defined by the appended claims.

[0019] Example 1

[0020] This embodiment provides a dimming and color-adjusting multi-color-temperature LED driving circuit, including a first LED group, a second LED group, and a color-adjusting LED component;

[0021] The first LED group is connected to N-1 positions of a multi-position switch, and the second LED group is connected to N-1 other positions of the multi-position switch, where N is the total number of positions of the multi-position switch, and one of the positions connected to the first LED group and the second LED group does not overlap; the second LED group is connected to the position that overlaps with the first LED group through resistors of different resistance values; the color-adjusting LED component is connected to the second lower position of the multi-position switch, the other lower positions of the multi-position switch are connected to the negative terminal of electrolytic capacitor C1, and the positive terminal of electrolytic capacitor C1 is connected to the positive terminals of the first LED group, the second LED group, and the color-adjusting LED component.

[0022] Specifically, in this embodiment, the multi-position switch is a double-pole five-position switch K1. The color temperature of the first LED group is 2700K, the color temperature of the second LED group is 5000K, and the color temperature of the color-adjusting LED component is 1800K. The operation of each position is as follows:

[0023] ①When K1 is adjusted to position 1, the first LED light group conducts current, which flows through the upper pin 1 of K1 to the upper pin S, then to the lower pin S, and then back to the negative terminal of electrolytic C1; the color temperature of the entire lamp is the color temperature of the first LED light group, which is 2700K.

[0024] ② When K1 is adjusted to level 2, the first LED group conducts current, which flows through pin 2 of K1 to pin S and then to pin 2 of K1, returning to the negative terminal of electrolytic capacitor C1; the second LED group conducts current, which flows through R2 to pin 2 of K1 to pin S and then to pin 2 of K1, returning to the negative terminal of electrolytic capacitor C1; the color-tuning LED component is also energized, flowing through pin 2 of K1 to pin S and then back to the negative terminal of electrolytic capacitor C1; at this time, the output light color temperature is 3000K; by adjusting the duty cycle of the PWM signal driving the switching transistor Q1, the brightness of the color-tuning LED component can be adjusted, thereby changing the output light brightness and color temperature, and realizing the dimming function.

[0025] ③ When K1 is adjusted to level 3, the first LED group conducts current, which flows through the upper 3 pins of K1 to the upper S pin and then to the lower 3 pins back to the negative terminal of electrolytic capacitor C1; the second LED group conducts current, which flows through R3 to the upper 3 pins of K1 to the upper S pin and then to the lower 3 pins back to the negative terminal of electrolytic capacitor C1; at this time, the light output color temperature is 3500K;

[0026] ④ When K1 is adjusted to level 4, the first LED group conducts current, which flows through the upper 4 pins of K1 to the upper S pin and then to the lower 4 pins back to the negative terminal of electrolytic capacitor C1; the second LED group conducts current, which flows through R4 to the upper 4 pins of K1 to the upper S pin and then to the lower 4 pins back to the negative terminal of electrolytic capacitor C1; at this time, the output light color temperature is 4000K.

[0027] ⑤ When K1 is adjusted to level 5, the second LED light group conducts current. The current flows through the upper 5 pin of K1 to the upper S pin, then to the lower S pin, then to the lower S pin, and then back to the negative electrode of electrolytic C1. At this time, the output color temperature is 5000K.

[0028] In this embodiment, the color-tuning LED assembly includes a color-tuning LED lamp group, a switching transistor Q1, a diode D1, a capacitor C2, and a resistor R5; wherein the switching transistor Q1 is connected between the negative terminal of the color-tuning LED lamp group and the input terminal of the lower position of the multi-position switch, and the output terminal of the lower position of the multi-position switch is connected to the negative terminal of the electrolytic capacitor C1 through the resistor R5; the control terminal of the switching transistor Q1 is connected to the negative terminal of the electrolytic capacitor C1 through the diode D1; the diode D1 is connected in parallel with the capacitor C2; the control terminal of the switching transistor Q1 is also connected to the positive terminal of the electrolytic capacitor C1 through the resistor R6.

[0029] Specifically, the electrolytic capacitor C1 is connected in parallel with the capacitor R1. The first LED group and the second LED group are each connected to the upper second position of the multi-position switch via diodes. The second LED group is also connected to positions other than the first and second positions via diodes. The first LED group is also connected to positions other than the second and fifth positions via diodes.

[0030] The LED driver circuit described above can be widely used in various LED lamps that require dimming and color adjustment.

[0031] Example 2

[0032] refer to Figure 2 The difference between this embodiment and embodiment 1 is that the color-adjusting LED component is connected to the third gear.

[0033] Example 3

[0034] refer to Figure 3 Compared with Embodiment 1, Embodiment 1 also included a reverse diode in the overlapping positions where the first LED light group and the second LED light group are connected, while Embodiment 3 omits the reverse diode.

[0035] The above is only one specific embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A multi-level color temperature LED driver circuit with dimming and color adjustment, characterized in that: Includes a first LED light group, a second LED light group, and a color-adjusting LED assembly; The first LED group is connected to the upper N-1 positions of a multi-position switch, and the second LED group is connected to the N-1 positions of the multi-position switch, where N is the total number of positions of the multi-position switch, and one of the positions connected to the first LED group and the second LED group is not overlapping; the second LED group is connected to the position overlapping with the first LED group through resistors of different resistance values; the color-adjusting LED component is connected to the second lower position of the multi-position switch, the remaining lower positions of the multi-position switch are connected to the negative terminal of electrolytic capacitor C1, and the positive terminal of electrolytic capacitor C1 is connected to the positive terminals of the first LED group, the second LED group, and the color-adjusting LED component. 2.The dimming and color-tuning multi-step color temperature LED driving circuit according to claim 1, wherein: The color-tuning LED assembly includes a color-tuning LED lamp group, a switching transistor Q1, a diode D1, a capacitor C2, and a resistor R5; The switching transistor Q1 is connected between the negative terminal of the color-adjusting LED light group and the input terminal of the lower position of the multi-position switch. The output terminal of the lower position of the multi-position switch is connected to the negative terminal of electrolytic capacitor C1 through resistor R5. The control terminal of the switching transistor Q1 is connected to the negative terminal of electrolytic capacitor C1 through diode D1. Diode D1 is connected in parallel with capacitor C2. The control terminal of the switching transistor Q1 is also connected to the positive terminal of electrolytic capacitor C1 through resistor R6. 3.The dimming and color-tuning multi-step color temperature LED driving circuit according to claim 1, wherein: The electrolytic capacitor C1 is connected in parallel with the capacitor R1.

4. The dimming and color-tuning multi-brightness color temperature LED driving circuit according to claim 1, characterized in that: The first LED light group and the second LED light group are respectively connected to the upper second position of the multi-position switch via diodes.

5. The LED driving circuit for dimming and color adjusting with multiple color temperatures according to claim 4, characterized in that: The second LED light group is also connected to gears other than the first and second gears via diodes.

6. The dimming and color-tuning multi-brightness color temperature LED driving circuit according to claim 4, characterized in that: The first LED light group is also connected to gears other than the second and Nth gears via diodes.

7. An LED luminaire, characterized by The drive circuit according to any one of claims 1-6 is assembled.

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