Color temperature light mixing system and control method thereof
By using a combination of mechanical switching switches and diodes in the luminaire, precise switching between five preset color temperatures is achieved, solving the problems of complex circuits, high cost, and high risk of flicker in existing technologies. It provides a stable and reliable multi-color temperature switching solution suitable for both residential and commercial lighting.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WAC LIGHTING DONGGUAN
- Filing Date
- 2026-01-30
- Publication Date
- 2026-04-10
AI Technical Summary
Existing technologies for achieving multi-color temperature switching generally suffer from problems such as complex circuitry, high cost, risk of flicker, large size, or insufficient color temperature control accuracy. In particular, there is a lack of simple, stable, reliable, flicker-free solutions that can accurately output multiple standard color temperatures, especially in home and general commercial lighting scenarios.
A color temperature mixing system is adopted, which uses a mechanical switching switch and several discrete diodes. The current ratio is adjusted by the forward voltage drop of the diodes to achieve the switching of five preset color temperatures. The circuit structure is simple, relying only on a mechanical switching switch and several discrete diodes. The number of components is small, the board space is small, and it is easy to integrate into the lamp or switch panel.
It meets diverse lighting atmosphere requirements in different scenarios, has a simple structure, low cost, high reliability, avoids flicker problems, improves visual comfort, and has a compact circuit that is easy to integrate, making it suitable for both home and commercial lighting.
Smart Images
Figure CN121842887A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of switching circuit, in particular to a color temperature mixed light system and a control method thereof. BACKGROUND
[0002] In the field of modern lighting, especially in LED lighting applications, users have higher requirements for the comfort and flexibility of light environment. A single color temperature light source cannot meet the needs of different scenes for illuminance and atmosphere, so adjustable color temperature lighting technology has gradually become mainstream. The commonly used dual-color temperature or multi-color temperature LED lamps currently usually use the following methods to achieve color temperature adjustment: PWM (Pulse Width Modulation) dimming control: the duty cycle of the drive current of high and low color temperature LEDs is adjusted by a microcontroller to mix the target color temperature. Although this method has high precision and continuous adjustable color temperature, it requires additional MCU, constant current drive chip and complex control circuit, which is high in cost, and high-frequency switching may introduce electromagnetic interference or flicker problem sensitive to human eyes.
[0003] Multi-channel independent constant current driving scheme: independent constant current sources are configured for high and low color temperature LEDs, and the output current ratio is adjusted by analog voltage or digital signal. This scheme has good stability, but the system is complex, large in size and high in power consumption, which is not suitable for low-cost and small-sized lamp products.
[0004] Mechanical switching with resistance voltage division: some simple products use mechanical switches to switch different resistance values of current limiting resistors to change the branch current. However, the resistance has large power consumption and obvious temperature drift, and it is difficult to accurately match the required current ratio, resulting in large color temperature deviation and poor consistency.
[0005] In summary, the existing technology has the problems of complex circuit, high cost, flicker risk, large size or insufficient color temperature control precision when implementing multi-color temperature switching, especially in household and ordinary commercial lighting scenes with high requirements for cost and reliability, there is a lack of a simple structure, stable and reliable, no flicker and accurate output of multi-standard color temperature solution. SUMMARY
[0006] The present application provides a color temperature mixed light system and a control method thereof to solve the problems of the prior art, which realizes the switching control of five preset color temperatures, meets the diversified needs of users for light atmosphere in different scenes, has simple structure, low cost and high reliability, compact circuit structure and is easy to integrate, only relies on a mechanical switch and a plurality of discrete diodes, has few components and small layout space, and is convenient for integration in the lamp interior or the switch panel.
[0007] In order to solve the above technical problems, the present application adopts the following technical scheme: The present application provides a color temperature mixed light system, which comprises: A switch module comprising a plurality of gear switches for selecting different color temperature output modes; A constant current driving power supply comprising a low color temperature LED load connection end W- for connecting a low color temperature light source, a high color temperature LED load connection end C- for connecting a high color temperature light source, and a common negative terminal COM; A plurality of diodes configured between the low color temperature LED load connection end W- and the high color temperature LED load connection end C- to form a plurality of current paths; When the switch is in different gears, the low color temperature LED load connection end W- and / or the high color temperature LED load connection end C- are connected to the common negative terminal COM via corresponding diodes by turning on different internal contacts, and the current ratio flowing through the first and second color temperature LED loads is adjusted by using the forward conduction voltage drop of the diodes, thereby controlling the switching of a plurality of preset color temperatures.
[0008] The switch is a one-bit five-gear switch, and the gears include: The first gear only turns on a direct current path from the low color temperature LED load connection end W- to the common negative terminal COM, so that all the current flows through the low color temperature light source, and a first color temperature is outputted; The second gear turns on a first current path from the low color temperature LED load connection end W- to the common negative terminal COM via a first group of diodes, and a second current path from the high color temperature LED load connection end C- to the common negative terminal COM via a second group of diodes, so that the current ratio of the low color temperature light source to the high color temperature light source is 78%:22%, and a second color temperature is outputted; The third gear turns on a first current path from the low color temperature LED load connection end W- to the common negative terminal COM via a third group of diodes, and a second current path from the high color temperature LED load connection end C- to the common negative terminal COM via a fourth group of diodes, so that the current ratio of the low color temperature light source to the high color temperature light source is 50%:50%, and a third color temperature is outputted; The fourth gear turns on a first current path from the low color temperature LED load connection end W- to the common negative terminal COM via a fifth group of diodes, and a second current path from the high color temperature LED load connection end C- to the common negative terminal COM via a sixth group of diodes, so that the current ratio of the low color temperature light source to the high color temperature light source is 30%:70%, and a fourth color temperature is outputted; The fifth gear only turns on a direct current path from the high color temperature LED load connection end C- to the common negative terminal COM, so that all the current flows through the high color temperature light source, and a fifth color temperature is outputted.
[0009] 3. The color temperature mixed light system according to claim 2, wherein the first color temperature is 2700K, the second color temperature is 3000K, the third color temperature is 3500K, the fourth color temperature is 4000K, and the fifth color temperature is 5000K.
[0010] The first group of diodes includes diode D6.
[0011] The second group of diodes includes diode D1, diode D2, diode D3, diode D4, and diode D5 connected in sequence.
[0012] The third group of diodes includes diode D8.
[0013] The fourth group of diodes includes diode D7.
[0014] The fifth group of diodes includes diode D10, diode D11, diode D12, diode D13, and diode D14 connected in sequence.
[0015] The sixth group of diodes includes diode D9.
[0016] The application also provides a color temperature mixed light control method based on the color temperature mixed light system, which includes the following steps: Step S1, providing a constant current driving power supply and a double color temperature LED load: connecting a low color temperature LED light source to the low color temperature LED load connection end W of the constant current driving power supply - ; connecting a high color temperature LED light source to the high color temperature LED load connection end C of the constant current driving power supply - ; the common negative end COM of the constant current driving power supply as a common return end of the current loop; Step S2, configuring multiple diode-based current paths: between the low color temperature LED load connection end W - and the common negative end COM and between the high color temperature LED load connection end C - and the common negative end COM, multiple groups of current branches composed of different numbers and / or types of diodes are preset; Step S3, operating a one-bit five-grade switch to select a target color temperature grade, and a user dials the switch to the corresponding grade according to lighting requirements, and the system executes any of the following modes: Step S3.1, if the first grade 2700K is selected: the switch internally connects 9-pin to 3-pin and 10-pin to 4-pin, and only the low color temperature LED load connection end W -High color temperature LED load connection end C is connected to the common negative terminal COM through a direct current path - Off, all constant current flows through low color temperature LEDs, high color temperature LEDs have no current, and the output color temperature is 2700K.
[0017] Step S3.2, if the second gear 3000K is selected: The switch internally connects 9-pin-5-pin, 10-pin-6-pin, and the low color temperature LED load connection end W - High color temperature LED load connection end C is connected to the common negative terminal COM through diode D6 - Low color temperature LED load connection end W is connected to the common negative terminal COM through diodes D1-D5 in series, and the difference in forward voltage drop between diode D6 and diodes D1-D5 is used to form two parallel current paths. - Branch current accounts for 78%, and high color temperature LED load connection end C - Branch accounts for 22%, and the mixed output color temperature is 3000K. Step S3.3, if the third gear 3500K is selected: The switch internally connects 9-pin-7-pin, 10-pin-8-pin, and the low color temperature LED load connection end W - High color temperature LED load connection end C is connected to the common negative terminal COM through diode D8 - Diodes D7 are respectively connected to the common negative terminal COM; the current ratio of the two branches is about 50%:50% due to the similar diode voltage drops, and the mixed output color temperature is 3500K.
[0018] Step S3.4, if the fourth gear 4000K is selected: The switch internally connects 9-pin-11-pin, 10-pin-12-pin, and the low color temperature LED load connection end W - High color temperature LED load connection end C is connected through diodes D10-D14 in series - Diodes D9 are respectively connected to the common negative terminal COM; the low color temperature LED load connection end W has high impedance - The branch limits its current to 30%, and the low impedance high color temperature LED load connection end C - The branch carries 70% of the current, and the mixed output color temperature is 4000K.
[0019] Step S3.5, if the fifth gear 5000K is selected: The switch internally connects 9-pin-13-pin, 10-pin-14-pin; only high color temperature LED load connection end C - Low color temperature LED load connection end W is connected to the common negative terminal COM through a direct current path - Off; all constant current flows through high color temperature LEDs, and low color temperature LEDs have no current, and the output color temperature is 5000K.
[0020] The beneficial effects of the present application are: The present application has the advantages of ingenious design, forming multiple current paths between the low-color-temperature LED load connection end W- and the high-color-temperature LED load connection end C- through the cooperation of the switch and multiple diodes, realizing the switching control of five preset color temperatures, meeting the diversified needs of users for the lighting atmosphere in different scenes, realizing passive current distribution by using the diode voltage drop, without additional constant-current driving chips or complex control circuits, and naturally forming different current path impedances by reasonably configuring the number and type of series-connected diodes (by using the difference in forward conduction voltage drop), thereby automatically adjusting the current distribution ratio of the high and low color temperature LED branches, and the present application has the advantages of simple structure, low cost and high reliability.
[0021] The present application has the advantages of compact circuit structure, easy integration, small number of components, small board space, easy integration in the lamp interior or switch panel, and application in volume and cost sensitive application scenarios such as household and commercial lighting; the LED load under each gear is connected to the common negative electrode through a direct current path or through a diode steady-state conduction, the working state is stable, the frequency flicker problem caused by PWM dimming is avoided, and the visual comfort is improved.
[0022] Further, the present application can realize constant lamp output luminous flux when the color temperature is switched; in addition, if the lamp works for a long time, according to the characteristics of the diode, the voltage drop on the diode remains stable when working in constant current, thereby ensuring stable mixed light color temperature. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 The present application is a circuit diagram of a color temperature mixed light system. DETAILED DESCRIPTION
[0024] In order to facilitate the understanding of those skilled in the art, the present application will be further described below in conjunction with the embodiments and the drawings, and the content mentioned in the embodiments is not a limitation of the present application. The present application will be described in detail below in conjunction with the drawings.
[0025] Example 1 A color temperature mixed light system, as shown in Figure 1 It comprises: A switch module comprising a switch with multiple gears, the switch being used to select different color temperature output modes; A constant-current driving power supply comprising a low-color-temperature LED load connection end W-, a high-color-temperature LED load connection end C- and a common negative terminal COM, the low-color-temperature LED load connection end W- being used to connect a low-color-temperature light source, and the high-color-temperature LED load connection end C- being used to connect a high-color-temperature light source; a plurality of diodes are arranged between the low-color-temperature LED load connection end W- and the high-color-temperature LED load connection end C- to form a plurality of current paths; When the switcher is in different gears, the low-color-temperature LED load connection end W- and / or the high-color-temperature LED load connection end C- are connected to the common negative terminal COM via a specific number and parameters of diodes by turning on different internal contacts, the current proportion flowing through the first color temperature LED load and the second color temperature LED load is adjusted by using the forward conduction voltage drop of the diodes, and the switching of the plurality of preset color temperatures is controlled.
[0026] Specifically, the present application is designed ingeniously, a plurality of current paths are formed between the low-color-temperature LED load connection end W- and the high-color-temperature LED load connection end C- by the cooperation of the switcher and the plurality of diodes, the switching of the five preset color temperatures is realized, and the diversified demand of the user for the lighting atmosphere in different scenes is met; the present application realizes passive current distribution by using the diode voltage drop, does not need additional constant current driving chip or complex control circuit, and only by reasonably configuring the number and type of the series diodes (using the difference of the forward conduction voltage drop), different current path impedances can be naturally formed, so that the current distribution proportion of the high and low color temperature LED branches is automatically adjusted, the present application scheme is simple in structure, low in cost and high in reliability.
[0027] The circuit structure of the present application is compact and easy to integrate, only relies on one mechanical switcher and a plurality of discrete diodes, the number of components is small, the board space is small, is easy to integrate in the lamp interior or the switch panel, is suitable for the application scenes sensitive to volume and cost such as household and commercial lighting; the LED load under each gear is connected to the common negative terminal through the direct current path or the steady-state conduction of the diode, the working state is stable, the frequency flicker problem possibly caused by the PWM dimming is avoided, and the visual comfort is improved.
[0028] Embodiment two In the embodiment two of the present application, the switching of the five preset color temperatures is realized by the color temperature mixed light system; the switcher is a one-bit five-gear switch, and the gears include: The first gear, only the direct current path from the low-color-temperature LED load connection end W- to the common negative terminal COM is turned on, so that all the current flows through the low-color-temperature light source, and the first color temperature is output, the first color temperature is 2700K; in the specific work, the switcher stays in the first gear, the 9th pin and the 3rd pin of the switcher are connected, the 10th pin and the 4th pin are connected, the current flows from the low-color-temperature LED load connection end W- to the common negative terminal COM and returns to the negative terminal, the high-color-temperature LED load connection end C- is cut off, at this time, the low-color-temperature light source current proportion is 100%, that is, the LED lamp color temperature is 2700K.
[0029] The second gear connects the first current path from the low color temperature LED load connection end W to the common negative terminal COM through the first group of diodes, and the second current path from the high color temperature LED load connection end C to the common negative terminal COM through the second group of diodes, so that the current ratio of the low color temperature light source to the high color temperature light source is 78:22, and a second color temperature of 3000K is output; wherein the first group of diodes includes diode D6; the second group of diodes includes diodes D1, D2, D3, D4 and D5 connected in sequence. In specific work, the switching switch stays at the second gear, the 9th pin and the 5th pin of the switching switch are connected, the 10th pin and the 6th pin are connected, the current is divided into two paths, one path flows from the low color temperature LED load connection end W to the common negative terminal COM through diode D6 and returns to the negative electrode, and the other path flows from the high color temperature LED load connection end C to the common negative terminal COM through D1, diode D2, diode D3, diode D4 and diode D5 and returns to the negative electrode current cutoff, and the parameters and the number of diodes are adjusted so that the low color temperature current accounts for 78% of the total current, the high color temperature current accounts for 22% of the total current, and the color temperature of the LED lamp is 3000K.
[0030] The third gear connects the first current path from the low color temperature LED load connection end W to the common negative terminal COM through the third group of diodes, and the second current path from the high color temperature LED load connection end C to the common negative terminal COM through the fourth group of diodes, so that the current ratio of the low color temperature light source to the high color temperature light source is 50:50, and a third color temperature of 3500K is output; wherein the third group of diodes includes diode D8; the fourth group of diodes includes diode D7. In specific work, the switching switch stays at the third gear, the 9th pin and the 7th pin of the switching switch are connected, the 10th pin and the 8th pin are connected, the current is divided into two paths, one path flows from the low color temperature LED load connection end W to the common negative terminal COM through diode D8 and returns to the negative electrode, and the other path flows from the high color temperature LED load connection end C to the common negative terminal COM through diode D7 and returns to the negative electrode current cutoff, and the parameters and the number of diodes are adjusted so that the low color temperature current accounts for 50% of the total current, the high color temperature current accounts for 50% of the total current, and the color temperature of the LED lamp is 3500K.
[0031] In the fourth gear, a first current path from the low color temperature LED load connection end W- to the common negative terminal COM via the fifth group of diodes and a second current path from the high color temperature LED load connection end C- to the common negative terminal COM via the sixth group of diodes are connected, so that the current ratio of the low color temperature light source to the high color temperature light source is 30:70, and a fourth color temperature of 4000K is output; wherein the fifth group of diodes comprises diodes D10, D11, D12, D13 and D14 connected in sequence; and the sixth group of diodes comprises diode D9. In the specific operation, the switching switch stays in the fourth gear, the 9th pin and the 11th pin of the switch are connected, the 10th pin and the 12th pin of the switch are connected, the current is divided into two paths, one path flows from the low color temperature LED load connection end W- to the negative common terminal COM via diodes D10, D11, D12, D13 and D14 and then returns to the negative electrode, and the other path flows from the high color temperature LED load connection end C- to the common negative terminal COM via diode D9 and then returns to the negative electrode, so that the low color temperature current accounts for 30% of the total current and the high color temperature current accounts for 70% of the total current, and the color temperature of the LED lamp is 4000K.
[0032] In the fifth gear, only a direct current path from the high color temperature LED load connection end C- to the common negative terminal COM is connected, so that all the current flows through the high color temperature light source, and a fifth color temperature of 5000K is output. In the specific operation, the switching switch stays in the fifth gear, the 9th pin and the 13th pin of the switch are connected, the 10th pin and the 14th pin of the switch are connected, the current flows from the high color temperature LED load connection end C- to COM and then returns to the negative electrode, and the current of the low color temperature LED load connection end W- is cut off, so that the high color temperature current accounts for 100%, and the color temperature of the LED lamp is 5000K.
[0033] In the embodiment, the first color temperature is 2700K, the second color temperature is 3000K, the third color temperature is 3500K, the fourth color temperature is 4000K, and the fifth color temperature is 5000K.
[0034] Specifically, the application combines different numbers and parameters of diode groups through a five-gear switching switch, and controls the current ratio (100:0, 78:22, 50:50, 30:70, 0:100) of the low color temperature (2700K) and high color temperature (5000K) LED light sources in five preset gears, so as to accurately output five standard color temperatures of 2700K, 3000K, 3500K, 4000K and 5000K, and meet the diversified needs of users for light atmosphere in different scenes.
[0035] Further, the application uses diode voltage drop to realize passive current distribution, without additional constant current driving chip or complex control circuit, and only by reasonably configuring the number and type of series diodes (using the difference of forward conduction voltage drop), different current path impedances can be naturally formed, thereby automatically adjusting the current distribution ratio of high and low color temperature LED branches. The scheme has simple structure, low cost and high reliability.
[0036] Further, under the above settings, the lamp output luminous flux remains unchanged when the color temperature is switched. In addition, if the lamp works for a long time, according to the diode characteristics, the voltage drop on the diode remains stable when working in constant current, thereby ensuring that the mixed light color temperature remains stable.
[0037] Embodiment Three In the third embodiment of the application, the difference from the second embodiment is that the number of switching switches and current paths can be adjusted according to actual needs, and three color temperatures, four color temperatures, six color temperatures, etc. can be realized. Those skilled in the art only need to make simple modifications to the circuit, and this will not be described here.
[0038] Embodiment Four In the fourth embodiment of the application, a color temperature mixed light control method based on the color temperature mixed light system is provided, which includes the following steps: Step S1, providing a constant current driving power supply and a dual color temperature LED load: connecting the low color temperature LED light source to the low color temperature LED load connection end W of the constant current driving power supply - ; connecting the high color temperature LED light source to the high color temperature LED load connection end C of the constant current driving power supply - ; the common negative end COM of the constant current driving power supply as the common return end of the current loop; Step S2, configuring multiple diode-based current paths: preparing multiple groups of current branches composed of different numbers and / or types of diodes between the low color temperature LED load connection end W - and the common negative end COM and between the high color temperature LED load connection end C - and the common negative end COM; Step S3, operating a one-bit five-grade switching switch to select a target color temperature grade, and the user dials the switching switch to the corresponding grade according to the lighting demand, and the system executes any of the following modes: Step S3.1, if the first grade 2700K is selected: the internal switch connects 9-pin to 3-pin and 10-pin to 4-pin, and only the low color temperature LED load connection end W - is connected to the common negative end COM through the direct current path, and the high color temperature LED load connection end C- Disconnect, all constant current flows through low color temperature LED, high color temperature LED has no current, output color temperature is 2700K.
[0039] Step S3.2, if the second gear 3000K is selected: Switch inside on 9-pin-5-pin, 10-pin-6-pin, low color temperature LED load connection end W - Through diode D6 connected to the common negative COM, high color temperature LED load connection end C - Through diode D1-D5 connected in series to the common negative COM, forming two parallel current paths, using the difference between the forward voltage drop of diode D6 and diode D1-D5, low color temperature LED load connection end W - Branch current accounts for 78%, high color temperature LED load connection end C - Branch accounts for 22%, mixed output color temperature is 3000K; Step S3.3, if the third gear 3500K is selected: Switch inside on 9-pin-7-pin, 10-pin-8-pin, low color temperature LED load connection end W - Through diode D8, high color temperature LED load connection end C - Through diode D7 respectively connected to the common negative COM; two branch diode voltage drops are similar, the current ratio is about 50%:50%, Mixed output color temperature is 3500K.
[0040] Step S3.4: if the fourth gear 4000K is selected: Switch inside on 9-pin-11-pin, 10-pin-12-pin, low color temperature LED load connection end W - Through diode D10-D14 in series, high color temperature LED load connection end C - Through diode D9 respectively connected to the common negative COM; high impedance low color temperature LED load connection end W - Branch limits its current to 30%, low impedance high color temperature LED load connection end C - Branch carries 70% current, mixed output color temperature is 4000K.
[0041] Step S3.5, if the fifth gear 5000K is selected: Switch inside on 9-pin-13-pin, 10-pin-14-pin; only high color temperature LED load connection end C - Through direct current path connected to the common negative COM, low color temperature LED load connection end W - Disconnect; all constant current flows through high color temperature LED, low color temperature LED has no current, output color temperature is 5000K.
[0042] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application is disclosed with the preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the present application are within the scope of the technical solution of the present application.
Claims
1. A color temperature mixing system, characterized in that, include: The switching module includes a multi-position switch for selecting different color temperature output modes. A constant current drive power supply includes a low color temperature LED load connection terminal W-, a high color temperature LED load connection terminal C-, and a common negative terminal COM. The low color temperature LED load connection terminal W- is used to connect a low color temperature light source, and the high color temperature LED load connection terminal C- is used to connect a high color temperature light source. Multiple diodes are configured between the low color temperature LED load connection terminal W- and the high color temperature LED load connection terminal C- to form multiple current paths; When the switch is in different positions, by connecting different internal contacts, the low color temperature LED load connection terminal W- and / or the high color temperature LED load connection terminal C- are connected to the common negative terminal COM via the corresponding diodes. The forward voltage drop of the diodes is used to adjust the current ratio flowing through the first color temperature LED load and the second color temperature LED load, thereby controlling the switching of multiple preset color temperatures.
2. The color temperature mixing system according to claim 1, characterized in that: The switch is a single-position, five-position switch, and its positions include: In the first setting, only the DC path from the low color temperature LED load connection terminal W- to the common negative terminal COM is connected, so that all current flows through the low color temperature light source and outputs the first color temperature. In the second setting, the first current path from the low color temperature LED load connection terminal W- through the first set of diodes to the common negative terminal COM, and the second current path from the high color temperature LED load connection terminal C- through the second set of diodes to the common negative terminal COM are connected, so that the current ratio of the low color temperature light source to the high color temperature light source is 78%:22%, and the second color temperature is output. In the third setting, the first current path from the low color temperature LED load connection terminal W- through the third group of diodes to the common negative terminal COM, and the second current path from the high color temperature LED load connection terminal C- through the fourth group of diodes to the common negative terminal COM are connected, so that the current ratio of the low color temperature light source and the high color temperature light source is 50%:50%, and the third color temperature is output. In the fourth position, the first current path from the low color temperature LED load connection terminal W- through the fifth group of diodes to the common negative terminal COM, and the second current path from the high color temperature LED load connection terminal C- through the sixth group of diodes to the common negative terminal COM are connected, so that the current ratio of the low color temperature light source to the high color temperature light source is 30%:70%, and the fourth color temperature is output. In the fifth setting, only the DC path from the high color temperature LED load connection terminal C- to the common negative terminal COM is connected, so that all current flows through the high color temperature light source and outputs the fifth color temperature.
3. The color temperature mixing system according to claim 2, characterized in that: The first color temperature is 2700K, the second color temperature is 3000K, the third color temperature is 3500K, the fourth color temperature is 4000K, and the fifth color temperature is 5000K.
4. The color temperature mixing system according to claim 2, characterized in that: The first group of diodes includes diode D6.
5. A color temperature mixing system according to claim 2, characterized in that: The second group of diodes includes diodes D1, D2, D3, D4, and D5 connected in sequence.
6. A color temperature mixing system according to claim 2, characterized in that: The third group of diodes includes diode D8.
7. A color temperature mixing system according to claim 2, characterized in that: The fourth group of diodes includes diode D7.
8. A color temperature mixing system according to claim 2, characterized in that: The fifth group of diodes includes diodes D10, D11, D12, D13, and D14 connected in sequence.
9. A color temperature mixing system according to claim 2, characterized in that: The sixth group of diodes includes diode D9.
10. A method for controlling color temperature mixing based on the color temperature mixing system according to any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Provide a constant current drive power supply and a dual-color temperature LED load: Connect the low color temperature LED light source to the low color temperature LED load connection terminal W of the constant current drive power supply. - ; Connect the high color temperature LED light source to the high color temperature LED load connection terminal C of the constant current drive power supply. - ; The common negative terminal COM of the constant current drive power supply serves as the common return terminal of the current loop; Step S2: Configure multiple diode-based current paths: W at the low color temperature LED load connection terminal - Connection between the common negative terminal COM and the high color temperature LED load terminal C - Multiple current branches consisting of diodes of different numbers and / or types are pre-set between the common negative terminal COM; Step S3: Operate the one-position five-level selector switch to select the target color temperature level. The user toggles the selector switch to the corresponding level according to lighting needs, and the system executes any of the following modes: Step S3.1, if the first gear 2700K is selected: The switch internally connects pins 9-3 and 10-4, with only the low color temperature LED load connection terminal W connected. - The high color temperature LED load is connected to the common negative terminal COM via a DC path, and then to terminal C. - When disconnected, all constant current flows through the low color temperature LED, while the high color temperature LED receives no current, resulting in an output color temperature of 2700K. Step S3.2: If the second gear 3000K is selected: The switch internally connects pins 9-5 and 10-6, and the low color temperature LED load connection terminal W. - The high color temperature LED load is connected to terminal C via diode D6 connected to the common negative terminal COM. - Diodes D1–D5 are connected in series to the common negative terminal COM, forming two parallel current paths. Utilizing the difference in forward voltage drop between diode D6 and diodes D1–D5, the low color temperature LED load connection terminal W... - Branch current accounts for 78%, high color temperature LED load connection terminal C - Branch circuits account for 22%, and the mixed output color temperature is 3000K; Step S3.3: If the third gear 3500K is selected: The switch internally connects pins 9-7 and 10-8, and the low color temperature LED load connection terminal W. - Through diode D8, the high color temperature LED load is connected to terminal C. - The diodes are connected to the common negative terminal COM via diode D7; the voltage drops of the two diodes are similar, the current ratio is about 50%:50%, and the mixed output color temperature is 3500K. Step S3.4: If the fourth gear 4000K is selected: The switch internally connects pins 9-11 and 10-12, and the low color temperature LED load connection terminal W. - Diodes D10–D14 are connected in series, and the high color temperature LED load is connected to terminal C. - Diode D9 is connected to the common negative terminal COM; the high-impedance low color temperature LED load is connected to terminal W. - The branch limits its current to 30%, and the low-impedance high color temperature LED load is connected to terminal C. - The branch circuit carries 70% of the current, and the mixed output color temperature is 4000K. Step S3.5: If the fifth gear 5000K is selected: The switch internally connects pins 9-13 and pins 10-14; only the high color temperature LED load connection terminal C is connected. - The low color temperature LED load is connected to the common negative terminal COM via a DC path, and connected to the W terminal via a DC load. - Disconnect; all constant current flows through the high color temperature LED, and there is no current in the low color temperature LED, with an output color temperature of 5000K.