A color temperature adjustment circuit using a switching diode and resistor

Abstract

The present invention discloses a switch diode resistor color temperature adjustment circuit, comprising a rectifier filter circuit, a switch control circuit, a first LED lamp bead, a second LED lamp bead, and a color temperature adjustment circuit. The rectifier filter circuit is electrically connected to the first LED lamp bead, the second LED lamp bead, and the switch control circuit, respectively. The first LED lamp bead is connected in parallel with the second LED lamp bead, and both are electrically connected to the color temperature adjustment circuit. The color temperature adjustment circuit is electrically connected to the switch control circuit. The overall color temperature is between the color temperature of the first LED lamp bead and the color temperature of the second LED lamp bead. The color temperature adjustment circuit adjusts the current flowing through the first LED lamp bead and the second LED lamp bead to achieve control of different color temperatures. The present invention solves the problem in the prior art that the color temperature of LED lamps is large, which makes mass production difficult and costly. It provides a switch diode resistor color temperature adjustment circuit, which enables a lamp to have five color temperatures to choose from, and the color temperature adjustment is simple, reducing costs.

Description

Technical Field

[0001] The present invention relates to the technical field of LED lamp circuits, and more particularly to a switching diode and resistor color temperature adjustment circuit. Background Art

[0002] With the popularization of LED chip technology, its cost is getting lower and lower, and more and more lighting equipment is composed of LED light strings. However, as for LED household lamps, there are still many problems, such as how to switch between different color temperatures in one lamp.

[0003] While the current market demand for LED lighting remains strong, price is a major constraint on its widespread adoption. This is primarily due to the high costs of inventory and differentiated material preparation, hindering large-scale, standardized production. Currently, the market categorizes downlights by color temperature, with a single lamp potentially having five SKUs (2700K, 3000K, 3500K, 4000K, and 5000K). This requires stocking five different CCT LEDs during production, and the factory system will display BOM information for five different finished lamps, increasing procurement efforts fivefold.

[0004] A "LED light bar dimming and color temperature adjustment circuit" disclosed in Chinese patent literature, with publication number CN106332369A, comprises an external dimmable LED driver power supply, a first color temperature LED series circuit, a second color temperature LED series circuit, a first current-limiting resistor, and a second current-limiting resistor. The positive terminal of the external dimmable LED driver power supply is connected to both the positive and negative terminals of the first and second color temperature LED series circuits. The negative terminal of the first color temperature LED series circuit is connected to the negative terminal of the external dimmable LED driver power supply via the first current-limiting resistor, while the negative terminal of the second color temperature LED series circuit is connected to the negative terminal of the external dimmable LED driver power supply via the second current-limiting resistor. The number of LEDs in the first color temperature LED series circuit is different from the number of LEDs in the second color temperature LED series circuit. When the external dimmable LED driver power supply is adjusted to maximum brightness, the current flowing through the first color temperature LED series circuit is equal to the current flowing through the second color temperature LED series circuit. This technical solution can be implemented in a circuit that only has a dimmable function to achieve both dimming and color temperature adjustment functions. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that the color temperature of LED lamps varies greatly, which makes mass production difficult and costly. A switching diode resistor color temperature adjustment circuit is provided to achieve a lamp with five color temperatures to choose from, and the color temperature adjustment is simple and the cost is reduced.

[0006] In order to solve the above problems, the present invention adopts the following technical solutions:

[0007] A switching diode resistor color temperature adjustment circuit includes a rectifier and filter circuit, a switch control circuit, a first LED lamp bead, and a second LED lamp bead. The rectifier and filter circuits are electrically connected to the first LED lamp bead, the second LED lamp bead, and the switch control circuit, respectively. The circuit is characterized in that it also includes a color temperature adjustment circuit, the first LED lamp bead and the second LED lamp bead are both electrically connected to the color temperature adjustment circuit, and the color temperature adjustment circuit is electrically connected to the switch control circuit. The color temperature adjustment circuit adjusts the current flowing through the first LED lamp bead and the second LED lamp bead to achieve control of different color temperatures.

[0008] As a preference, the color temperature adjustment circuit includes a diode D1A, a diode D2A, a diode D3A, a diode D4A, a diode D5A, a diode D6A, a resistor R1A, a resistor R2A, and a resistor R3A. The anode of the diode D1A is electrically connected to the first LED lamp bead, the anode of the diode D6A, and the switch control circuit respectively. The cathode of the diode D1A is electrically connected to one end of the resistor R1A. The other end of the resistor R1A is electrically connected to the cathode of the diode D2A, the anode of the diode D4A, the anode of the diode D5A, and the switch control circuit respectively. The anode of the diode D2A is electrically connected to the second LED lamp bead respectively. The first LED lamp bead and the second LED lamp bead are electrically connected to each other, and the anode of the diode D3A is electrically connected to the switch control circuit and one end of the resistor R2A. The other end of the resistor R2A is electrically connected to the cathode of the diode D4A. The cathode of the diode D5A is electrically connected to one end of the resistor R3A. The other end of the resistor R3A is electrically connected to the switch control circuit and the cathode of the diode D6A. The current flowing through the first LED lamp bead and the second LED lamp bead is adjusted by the diodes and resistors in the color temperature adjustment circuit, and the final comprehensive color temperature of the first LED lamp bead and the second LED lamp bead is set by setting the resistance value of the resistor.

[0009] Preferably, the color temperature of the first LED lamp bead is higher than the color temperature of the second LED lamp bead, and the first LED lamp bead is connected in parallel to the second LED lamp bead.

[0010] Preferably, the switch control circuit includes a double-row five-speed sliding switch, which has a zeroth pin, a first pin, a second pin, a third pin, a fourth pin and a fifth pin, wherein the first pin, the second pin, the third pin, the fourth pin and the fifth pin are all electrically connected to the color temperature adjustment circuit, the zeroth pin is electrically connected to the rectifier and filter circuit, and the distribution of diodes and resistors on the color temperature adjustment circuits connected to different pins is different, so the comprehensive color temperature of the first LED lamp bead and the second LED lamp bead corresponding to each gear of the double-row five-speed sliding switch is different.

[0011] Preferably, the first pin is electrically connected to the anode of diode D6A, the anode of diode D1A and the first LED lamp bead, respectively; the second pin is electrically connected to one end of resistor R3A and the cathode of diode D6A, respectively; the third pin is electrically connected to the anode of diode D5A, the anode of diode D4A, the cathode of diode D2A and one end of resistor R1A, respectively; the fourth pin is electrically connected to the cathode of diode D3A and one end of resistor R2A, respectively; and the fifth pin is electrically connected to the anode of diode D3A, the anode of diode D2A and the second LED lamp bead, respectively.

[0012] Preferably, the rectifier and filter circuit includes a diode D2, a filter electrolytic capacitor EC2 and a resistor R13, the anode of the diode D2 is electrically connected to the positive pole of the power supply output terminal, the cathode of the diode D2 is electrically connected to one end of the resistor R13, the positive pole of the filter electrolytic capacitor EC2, the first LED lamp bead and the second LED lamp bead respectively, and the other end of the resistor R13 is electrically connected to the negative pole of the power supply output terminal, the negative pole of the filter electrolytic capacitor EC2 and the zeroth pin of the double-row five-speed sliding switch in the switch control circuit.

[0013] Preferably, the comprehensive color temperature of the first LED lamp bead and the second LED lamp bead controlled by the color temperature adjustment circuit is between the color temperature of the first LED lamp bead and the color temperature of the second LED lamp bead, the highest color temperature is the color temperature of the first LED lamp bead, and the lowest color temperature is the color temperature of the second LED lamp bead.

[0014] Therefore, the present invention has the following beneficial effects: (1) the current flowing through the first LED lamp bead and the current flowing through the second LED lamp bead are controlled by the color temperature adjustment circuit, thereby achieving five different color temperatures; (2) the LED lamps can be mass-produced and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a circuit principle connection structure block diagram of the present invention.

[0016] Figure 2 1 is a circuit connection diagram of an embodiment of the present invention.

[0017] In the figure: 1, color temperature adjustment circuit 2, rectification and filtering circuit 3, switch control circuit 4, first LED lamp bead 5, second LED lamp bead. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0019] like Figure 1As shown, a switching diode resistor color temperature adjustment circuit includes a rectifier and filter circuit 2, a switch control circuit 3, a first LED lamp bead 4, a second LED lamp bead 5 and a color temperature adjustment circuit 1. The rectifier and filter circuit 2 is electrically connected to the first LED lamp bead 4, the second LED lamp bead 5 and the switch control circuit 3 respectively. The color temperature of the first LED lamp bead 4 is higher than the color temperature of the second LED lamp bead 5, and the first LED lamp bead 4 is connected in parallel to the second LED lamp bead 5. The first LED lamp bead 4 and the second LED lamp bead 5 are both electrically connected to the color temperature adjustment circuit 1. The color temperature adjustment circuit 1 is electrically connected to the switch control circuit 3. The comprehensive color temperature of the first LED lamp bead 4 and the second LED lamp bead 5 controlled by the color temperature adjustment circuit 1 is between the color temperature of the first LED lamp bead 4 and the color temperature of the second LED lamp bead 5. The highest color temperature is the color temperature of the first LED lamp bead 4, and the lowest color temperature is the color temperature of the second LED lamp bead 5. The current flowing through the first LED lamp bead 4 and the second LED lamp bead 5 is adjusted by the color temperature adjustment circuit 1 to achieve control of different color temperatures.

[0020] like Figure 2In the embodiment shown, the first LED lamp bead 4 is composed of multiple light-emitting diodes, and its color temperature is 5000K. The second LED lamp bead 5 is composed of multiple light-emitting diodes, and its color temperature is 2700K. The color temperature adjustment circuit 1 includes a diode D1A, a diode D2A, a diode D3A, a diode D4A, a diode D5A, a diode D6A, a resistor R1A, a resistor R2A, and a resistor R3A. The switch control circuit 3 includes a double-row five-speed sliding switch, which has a zeroth pin, a first pin, a second pin, a third pin, a fourth pin and a fifth pin. The diode The anode of the diode D1A is electrically connected to the first LED lamp bead 4, the anode of the diode D6A and the first pin of the switch control circuit 3 respectively. The cathode of the diode D1A is electrically connected to one end of the resistor R1A. The other end of the resistor R1A is electrically connected to the cathode of the diode D2A, the anode of the diode D4A, the anode of the diode D5A and the third pin of the switch control circuit 3 respectively. The anode of the diode D2A is electrically connected to the second LED lamp bead 5, the anode of the diode D3A and the fifth pin of the switch control circuit 3 respectively. The cathode of the diode D3A is electrically connected to the fourth pin of the switch control circuit 3 and one end of the resistor R2A respectively. , the other end of the resistor R2A is electrically connected to the cathode of the diode D4A, the cathode of the diode D5A is electrically connected to one end of the resistor R3A, and the other end of the resistor R3A is electrically connected to the second pin of the switch control circuit 3 and the cathode of the diode D6A respectively. By adjusting the diodes and resistors in the color temperature adjustment circuit 1, the current flowing through the first LED lamp bead 4 and the second LED lamp bead 5 is adjusted, and the final comprehensive color temperature of the first LED lamp bead 4 and the second LED lamp bead 5 is set by setting the resistance value of the resistor. The distribution of diodes and resistors on the color temperature adjustment circuit 1 connected to different pins is different, so the double-row five-speed slide The comprehensive color temperature of the first LED lamp bead 4 and the second LED lamp bead 5 corresponding to each gear of the switch is different; the rectifier and filter circuit 2 includes a diode D2, a filter electrolytic capacitor EC2 and a resistor R13, the anode of the diode D2 is electrically connected to the positive pole of the power output terminal, the cathode of the diode D2 is electrically connected to one end of the resistor R13, the positive pole of the filter electrolytic capacitor EC2, the first LED lamp bead 4 and the second LED lamp bead 5, and the other end of the resistor R13 is electrically connected to the negative pole of the power output terminal, the negative pole of the filter electrolytic capacitor EC2 and the zeroth pin of the double-row five-speed sliding switch in the switch control circuit 3.

[0021] like Figure 2 In the embodiment shown, when the double-row five-speed sliding switch slides to the 1-0 position, that is, when the first pin is electrically connected to the color temperature adjustment circuit 1, only the first LED lamp bead 4 is lit, the second LED lamp bead 5 is not lit, and the comprehensive color temperature is displayed as 5000K.

[0022] When the double-row five-speed sliding switch slides to the 2-0 position, that is, when the second pin is electrically connected to the color temperature adjustment circuit 1, the first LED lamp bead 4 and the second LED lamp bead 5 are both lit. At this time, the total voltage of the circuit where the first LED lamp bead 4 is located is the voltage of the first LED lamp bead 4 plus the voltage of the diode D6A, which is equal to the total voltage of the circuit where the second LED lamp bead 5 is located, which is equal to the voltage of the second LED lamp bead 5 plus the voltage of the diode D2A plus the voltage of the diode D5A plus the voltage of the resistor R3A. The current of the circuit where the first LED lamp bead 4 is located is greater than the current of the circuit where the second LED lamp bead 5 is located. By adjusting the resistance value of the resistor R3A, the current of the first LED lamp bead 4 and the current of the second LED lamp bead 5 required for the actual test are obtained, and the comprehensive color temperature is achieved. 4000K.

[0023] When the double-row five-speed sliding switch slides to the 3-0 position, that is, when the third pin is electrically connected to the color temperature adjustment circuit 1, the first LED lamp bead 4 and the second LED lamp bead 5 are both lit. At this time, the total voltage of the circuit where the first LED lamp bead 4 is located is the voltage of the first LED lamp bead 4 plus the voltage of the diode D1A, which is equal to the total voltage of the circuit where the second LED lamp bead 5 is located, and is equal to the voltage of the second LED lamp bead 5 plus the voltage of the diode D2A. The current of the circuit where the first LED lamp bead 4 is located is less than the current of the circuit where the second LED lamp bead 5 is located. By adjusting the resistance value of the resistor R1A, the current of the first LED lamp bead 4 and the current of the second LED lamp bead 5 required for the actual test are obtained, and the comprehensive color temperature is achieved. 3500K.

[0024] When the double-row five-speed sliding switch slides to the 4-0 position, that is, when the fourth pin is electrically connected to the color temperature adjustment circuit 1, the first LED lamp bead 4 and the second LED lamp bead 5 are both lit, and the total voltage of the circuit where the first LED lamp bead 4 is located is the voltage of the first LED lamp bead 4 plus the voltage of the diode D1A plus the voltage of the resistor R1A plus the voltage of the diode D4A plus the voltage of the resistor R2A, which is equal to the total voltage of the circuit where the second LED lamp bead 5 is located, and is equal to the voltage of the second LED lamp bead 5 plus the voltage of the diode D3A. The current of the circuit where the first LED lamp bead 4 is located is less than the current of the circuit where the second LED lamp bead 5 is located. By adjusting the resistance value of the resistor R2A, the current of the first LED lamp bead 4 and the second LED lamp bead 5 required for the actual test are obtained, and the comprehensive color temperature is 3000K.

[0025] When the double-row five-speed sliding switch slides to the 5-0 position, that is, the fifth pin is electrically connected to the color temperature adjustment circuit 1, only the second LED lamp bead 5 is lit, the first LED lamp bead 4 is not lit, and the comprehensive color temperature is displayed as 2700K.

[0026] The present invention is obviously not limited to the details of the above-described embodiment. A variety of specific embodiments can be used to implement the present invention while still incorporating the essential features of the present invention. Therefore, this embodiment is intended to be illustrative rather than restrictive. Any changes or modifications made by those skilled in the art to the technical solution of the present invention that do not depart from the scope of the claims of the present invention are encompassed by the scope of patent protection of the present invention.

Claims

1. A switching diode resistor color temperature adjustment circuit, comprising a rectifier filter circuit (2), a switch control circuit (3), a first LED lamp bead (4), and a second LED lamp bead (5), wherein the rectifier filter circuit (2) is electrically connected to the first LED lamp bead (4), the second LED lamp bead (5), and the switch control circuit (3), respectively, and is characterized in that: The invention also includes a color temperature adjustment circuit (1), wherein the first LED lamp bead (4) and the second LED lamp bead (5) are both electrically connected to the color temperature adjustment circuit (1), the color temperature of the first LED lamp bead (4) is higher than the color temperature of the second LED lamp bead (5), and the color temperature adjustment circuit (1) is electrically connected to a switch control circuit (3), and the switch control circuit (3) includes a double-row five-speed sliding switch, and the distribution of diodes and resistors on the color temperature adjustment circuit (1) connected to different pins of the double-row five-speed sliding switch is different.

2. The switching diode resistor color temperature adjustment circuit according to claim 1, characterized in that: The color temperature adjustment circuit (1) includes a diode D1A, a diode D2A, a diode D3A, a diode D4A, a diode D5A, a diode D6A, a resistor R1A, a resistor R2A, and a resistor R3A. The anode of the diode D1A is electrically connected to the first LED lamp bead (4), the anode of the diode D6A, and the switch control circuit (3), respectively. The cathode of the diode D1A is electrically connected to one end of the resistor R1A, and the other end of the resistor R1A is electrically connected to the cathode of the diode D2A, the anode of the diode D4A, the anode of the diode D5A, and the switch control circuit (3), respectively. The anode of the diode D2A is electrically connected to the second LED lamp bead (5), the anode of the diode D3A, and the switch control circuit (3), respectively. The cathode of the diode D3A is electrically connected to the switch control circuit (3) and one end of the resistor R2A, and the other end of the resistor R2A is electrically connected to the cathode of the diode D4A. The cathode of the diode D5A is electrically connected to one end of the resistor R3A, and the other end of the resistor R3A is electrically connected to the switch control circuit (3) and the cathode of the diode D6A.

3. The switching diode resistor color temperature adjustment circuit according to claim 1, characterized in that: The first LED lamp bead (4) is connected in parallel to the second LED lamp bead (5).

4. The switching diode resistor color temperature adjustment circuit according to claim 3, characterized in that: The double-row five-speed sliding switch comprises a zeroth pin, a first pin, a second pin, a third pin, a fourth pin and a fifth pin, wherein the first pin, the second pin, the third pin, the fourth pin and the fifth pin are all electrically connected to a color temperature adjustment circuit (1), and the zeroth pin is electrically connected to a rectifier filter circuit (2).

5. The switching diode resistor color temperature adjustment circuit according to claim 4, characterized in that: The first pin is electrically connected to the anode of the diode D6A, the anode of the diode D1A and the first LED lamp bead (4) respectively, the second pin is electrically connected to one end of the resistor R3A and the cathode of the diode D6A respectively, the third pin is electrically connected to the anode of the diode D5A, the anode of the diode D4A, the cathode of the diode D2A and one end of the resistor R1A respectively, the fourth pin is electrically connected to the cathode of the diode D3A and one end of the resistor R2A respectively, and the fifth pin is electrically connected to the anode of the diode D3A, the anode of the diode D2A and the second LED lamp bead (5) respectively.

6. The switching diode resistor color temperature adjustment circuit according to claim 1, characterized in that: The rectifier filter circuit (2) includes a diode D2, a filter electrolytic capacitor EC2 and a resistor R13, wherein the anode of the diode D2 is electrically connected to the positive electrode of the power output terminal, the cathode of the diode D2 is electrically connected to one end of the resistor R13, the positive electrode of the filter electrolytic capacitor EC2, the first LED lamp bead (4) and the second LED lamp bead (5), respectively, and the other end of the resistor R13 is electrically connected to the negative electrode of the power output terminal, the negative electrode of the filter electrolytic capacitor EC2 and the zeroth pin of the double-row five-speed sliding switch in the switch control circuit (3).

7. The switching diode resistor color temperature adjustment circuit according to claim 1, characterized in that: The color temperature adjustment circuit (1) controls the first LED lamp bead (4) and the second LED lamp bead (5) to achieve a comprehensive color temperature between the color temperature of the first LED lamp bead (4) and the color temperature of the second LED lamp bead (5).

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