Lighting device with color temperature adjustment function

Abstract

A lighting device with a color temperature adjustment function includes a driving power supply, a switch circuit, a low color temperature light source, and a high color temperature light source. The switch circuit is connected to the driving power supply. The low color temperature light source is connected to the driving power supply and the switch circuit. The high color temperature light source is connected to the driving power supply and the switch circuit, and the color temperature of the high color temperature light source is greater than the color temperature of the low color temperature light source. The switch circuit switches so that the driving power supply forms three current loops to drive the low color temperature light source and the high color temperature light source.

Description

Technical Field

[0001] The invention relates to a lighting device, in particular to a lighting device with a color temperature adjustment function. Background Art

[0002] With the continuous development and innovation of science and technology, the functions and performance of LED lighting devices have been greatly improved. Existing LED lighting devices can not only provide basic lighting functions, but also introduce color temperature adjustment technology, so that users can flexibly change the color temperature of light according to different environmental requirements. However, due to the limitation of circuit structure, these LED lighting devices with color temperature adjustment function have obvious bottlenecks in improving light efficiency and cannot meet the needs of practical applications. Therefore, the light efficiency performance of existing LED lighting devices still needs to be further improved. Summary of the invention

[0003] According to one embodiment of the present invention, a lighting device with a color temperature adjustment function is provided, which includes a driving power supply, a switching circuit, a low color temperature light source, and a high color temperature light source. The switching circuit is connected to the driving power supply. The low color temperature light source is connected to the driving power supply and the switching circuit. The high color temperature light source is connected to the driving power supply and the switching circuit, and the color temperature of the high color temperature light source is greater than the color temperature of the low color temperature light source. The switching circuit switches so that the driving power supply forms three current loops to drive the low color temperature light source and the high color temperature light source.

[0004] In one embodiment, the switch circuit is switched so that the driving power supply forms a first current loop passing through the switch circuit, a second current loop passing through the high color temperature light source and the switch circuit, and a third current loop passing through the low color temperature light source and the switch circuit in the intermediate color temperature mode. The current of the second current loop is close to the current of the third current loop. The current of the second current loop and the current of the third current loop are much larger than the current of the first current loop. The color temperature of the intermediate color temperature mode is lower than the color temperature of the high color temperature light source but higher than the color temperature of the low color temperature light source.

[0005] In one embodiment, the lighting device further includes a regulating circuit. The regulating circuit is connected to the switch circuit. The switch circuit is switched so that the driving power supply forms a first current loop passing through the switch circuit, a second current loop passing through the high color temperature light source and the switch circuit, and a fourth current loop passing through the low color temperature light source, the switch circuit and the regulating circuit in the high color temperature mode. The current of the second current loop is much larger than the current of the first current loop and the current of the fourth current loop. The current of the first current loop is close to the current of the fourth current loop. The color temperature of the high color temperature mode is substantially equal to the color temperature of the high color temperature light source.

[0006] In one embodiment, the switch circuit is switched so that the driving power supply forms a first current loop through the switch circuit, a third current loop through the low color temperature light source and the switch circuit, and a fourth current loop through the high color temperature light source, the switch circuit and the regulating circuit in the low color temperature mode. The current of the third current loop is much larger than the current of the first current loop and the current of the fourth current loop. The current of the first current loop is close to the current of the fourth current loop. The color temperature of the low color temperature mode is substantially equal to the color temperature of the low color temperature light source.

[0007] In one embodiment, the switch circuit has a stabilizing unit. The stabilizing unit includes a current consuming resistor and a filter capacitor connected in parallel with each other. The first current loop passes through the stabilizing unit.

[0008] In one embodiment, the low color temperature light source and the high color temperature light source are light emitting diodes.

[0009] In one embodiment, the color temperature of the high color temperature light source is 2 to 3 times the color temperature of the low color temperature light source.

[0010] In one embodiment, the driving power source is a light emitting diode driver.

[0011] As described above, the lighting device with color temperature adjustment function according to the embodiments of the present invention may have one or more of the following advantages:

[0012] (1) In one embodiment of the present invention, the lighting device includes a driving power supply, a switching circuit, a low color temperature light source, and a high color temperature light source. The switching circuit is connected to the driving power supply. The low color temperature light source is connected to the driving power supply and the switching circuit. The high color temperature light source is connected to the driving power supply and the switching circuit, and the color temperature of the high color temperature light source is greater than the color temperature of the low color temperature light source. The switching circuit switches so that the driving power supply forms three current loops to drive the low color temperature light source and the high color temperature light source. As can be seen from the above, through the above circuit design and the switching mechanism of the switching circuit, the driving power supply can form three current loops to drive the low color temperature light source and the high color temperature light source, so that the lighting device can actually adjust the color temperature in more gears to meet the needs of different applications.

[0013] (2) In one embodiment of the present invention, the lighting device further includes a regulating circuit. The regulating circuit is connected to the switch circuit. The switch circuit is switched so that the driving power supply forms a first current loop passing through the switch circuit, a second current loop passing through the high color temperature light source and the switch circuit, and a fourth current loop passing through the low color temperature light source, the switch circuit and the regulating circuit in the high color temperature mode. The current of the second current loop is much larger than the current of the first current loop and the current of the fourth current loop. The current of the first current loop is close to the current of the fourth current loop. The color temperature of the high color temperature mode is substantially equal to the color temperature of the high color temperature light source. Through the above-mentioned circuit design and switch circuit switching mechanism, the driving power supply can drive the high color temperature light source with most of the current in the high color temperature mode, and drive the low color temperature light source with a very small current. In this way, the lighting device mainly outputs high color temperature light from the high color temperature light source in the high color temperature mode, and the low color temperature light generated by the low color temperature light source can be mixed with the high color temperature light to enhance the special color rendering properties (R9) of the mixed light.

[0014] (3) In one embodiment of the present invention, the switch circuit is switched so that the driving power supply forms a first current loop passing through the switch circuit, a third current loop passing through the low color temperature light source and the switch circuit, and a fourth current loop passing through the high color temperature light source, the switch circuit and the regulating circuit in the low color temperature mode. The current of the third current loop is much larger than the current of the first current loop and the current of the fourth current loop. The current of the first current loop is close to the current of the fourth current loop. The color temperature of the low color temperature mode is substantially equal to the color temperature of the low color temperature light source. Through the above-mentioned circuit design and switch circuit switching mechanism, the driving power supply can drive the low color temperature light source with most of the current in the low color temperature mode, and drive the high color temperature light source with a very small current. In this way, the lighting device mainly outputs low color temperature light through the low color temperature light source in the low color temperature mode, and the high color temperature light generated by the high color temperature light source can be mixed with the low color temperature light to improve the light effect of the mixed light.

[0015] (4) In one embodiment of the present invention, the circuit design and switch circuit switching mechanism of the lighting device can be applied to various existing light-emitting diode lighting devices, and can effectively achieve more levels of color temperature adjustment. At the same time, the circuit design and switch circuit switching mechanism of the lighting device can improve the light efficiency and special color rendering (R9) of the lighting device. Therefore, the lighting device can be more widely used and more flexible in use.

[0016] (5) In one embodiment of the present invention, the lighting device is simple in design and can achieve the desired effect without significantly increasing the cost. Therefore, the lighting device can achieve high practicality to meet the needs of different applications and meet the trend of future development. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1FIG. 1 is a schematic diagram of the structure of an illumination device with a color temperature adjustment function according to a first embodiment of the present invention.

[0018] Figure 2 FIG. 4 is a circuit diagram of a switch circuit of a lighting device with a color temperature adjustment function according to a second embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of a high color temperature mode of a switch circuit of an illumination device with color temperature adjustment function according to a second embodiment of the present invention.

[0020] Description of reference numerals:

[0021] 1-lighting device; 11-driving power supply; 12-switching circuit; 13-regulating circuit; 14-low color temperature light source; 15-high color temperature light source; I1-first current loop; I2-second current loop; I3-third current loop; I4-fourth current loop; L+-positive live wire output terminal; L--negative live wire output terminal; Ht-high color temperature output terminal; Lt-low color temperature output terminal; SU-stabilizing unit; Rs-current consumption resistor; EC-filter capacitor; SW-switch; R1-first resistor; R2-second resistor; R3-third resistor; R4-fourth resistor; R5-fifth resistor; R6-sixth resistor; R7-seventh resistor; R8-eighth resistor; Ra-shunt resistor; P1~P12-pins of the switch.

[0022] The detailed features and advantages of the present invention are described in detail in the following embodiments, and the contents are sufficient to enable anyone skilled in the relevant art to understand the technical content of the present invention and implement it accordingly. Moreover, according to the contents, claims and drawings disclosed in this specification, any person skilled in the relevant art can easily understand the purposes and advantages of the present creation. DETAILED DESCRIPTION

[0023] The following will refer to the relevant drawings to illustrate the embodiments of the lighting device with color temperature adjustment function according to the present invention. For the sake of clarity and convenience of the drawings, the components in the drawings may be exaggerated or reduced in size and proportion. In the following description and / or claims, when it is mentioned that a component is "connected" or "coupled" to another component, it may be directly connected or coupled to the other component or there may be an intervening component; and when it is mentioned that a component is "directly connected" or "directly coupled" to another component, there is no intervening component, and other words used to describe the relationship between components or layers should be interpreted in the same way. For ease of understanding, the same components in the following embodiments are illustrated with the same symbols.

[0024] See also Figure 1, which is a schematic diagram of the structure of a lighting device with a color temperature adjustment function according to a first embodiment of the present invention. As shown in the figure, the lighting device 1 includes a driving power supply 11, a switching circuit 12, a regulating circuit 13, a low color temperature light source 14 and a high color temperature light source 15.

[0025] The driving power source 11 is connected to the switch circuit 12. In one embodiment, the driving power source 11 can be any existing light emitting diode (LED) driver.

[0026] The low color temperature light source 14 is connected to the driving power supply 11 and the switching circuit 12. In one embodiment, the color temperature of the low color temperature light source 14 may be 3000K, and it may include one or more light emitting diodes, and these light emitting diodes may be connected in series or in parallel. In another embodiment, the color temperature of the low color temperature light source 14 may be 2500K. In another embodiment, the color temperature of the low color temperature light source 14 may be 2000K. The above is only an example, and the color temperature of the low color temperature light source 14 can be determined according to actual needs.

[0027] The high color temperature light source 15 is connected to the driving power supply 11 and the switching circuit 12. The color temperature of the high color temperature light source 15 is greater than the color temperature of the low color temperature light source 14. The color temperature of the high color temperature light source 15 is 2 to 3 times the color temperature of the low color temperature light source 14. In one embodiment, the color temperature of the high color temperature light source 15 may be 6500K, which may include one or more light emitting diodes, and these light emitting diodes may be connected in series or in parallel. In another embodiment, the color temperature of the high color temperature light source 15 may be 6000K. In yet another embodiment, the color temperature of the high color temperature light source 15 may be 7000K. The above is only an example, and the color temperature of the high color temperature light source 15 can be determined according to actual needs.

[0028] The regulating circuit 13 is connected to the switch circuit 12. In one embodiment, the regulating circuit 13 may be a shunt resistor. In another embodiment, the regulating circuit 13 may be a circuit including a plurality of resistors, and these resistors may be connected in series or in parallel. In yet another embodiment, the regulating circuit 13 may include both a serial circuit and a parallel circuit.

[0029] In this embodiment, the switch circuit 12 can be switched so that the driving power supply 11 forms at least three current loops to drive the low color temperature light source 14 and the high color temperature light source 15. The user can operate the switch circuit 12 to enter the intermediate color temperature mode, the high color temperature mode or the low color temperature mode. The high color temperature mode indicates that the color temperature of the lighting device 1 is 6500K. The low color temperature mode indicates that the color temperature of the lighting device 1 is 3000K. The color temperature of the intermediate color temperature mode is less than the color temperature of the high color temperature light source 15 but greater than the color temperature of the low color temperature light source 14. In other words, the intermediate color temperature mode indicates that the color temperature of the lighting device 1 is greater than 3000K but less than 6500K (such as 3500K, 4000K, 5000K...). The color temperature of the high color temperature mode is substantially equal to or close to the color temperature of the high color temperature light source 15. The color temperature of the low color temperature mode is substantially equal to the color temperature of the low color temperature light source 14.

[0030] When the user operates the switch circuit 12 to enter the intermediate color temperature mode, the switch circuit 12 switches so that the driving power supply 11 forms a first current loop I1 passing through the switch circuit 12, a second current loop I2 passing through the high color temperature light source 15 and the switch circuit 12, and a third current loop I3 passing through the low color temperature light source 14 and the switch circuit 12. The sum of the currents of the first current loop I1, the second current loop I2, and the third current loop I3 is the total current output by the driving power supply 11, and this total current will flow back to the driving power supply 11.

[0031] In the intermediate color temperature mode, the current of the second current loop I2 is close to the current of the third current loop I3. For example, the difference between the current of the second current loop I2 and the current of the third current loop I3 is greater than or equal to 1% of the total current, but less than 20% of the total current. The current of the second current loop I2 and the current of the third current loop I3 are much greater than the current of the first current loop I1. For example, the current of the second current loop I2 is 10 times or more of the current of the first current loop I1, and the current of the third current loop I3 is also 10 times or more of the current of the first current loop I1. For example, the current of the first current loop I1 is 1% of the total current; the current of the second current loop I2 is 49% of the total current; and the current of the third current loop I3 is 50% of the total current. For example, the current of the first current loop I1 is 2% of the total current; the current of the second current loop I2 is 45% of the total current; and the current of the third current loop I3 is 53% of the total current. The currents of the first current loop I1 , the second current loop I2 , and the third current loop I3 can be adjusted to achieve a desired color temperature.

[0032] When the user operates the switch circuit 12 to enter the high color temperature mode, the switch circuit 12 switches so that the driving power supply 11 forms a first current loop I1 passing through the switch circuit 12, a second current loop I2 passing through the high color temperature light source 15 and the switch circuit 12, and a fourth current loop I4 passing through the low color temperature light source 14, the switch circuit 12, and the regulating circuit 13. The sum of the currents of the first current loop I1, the second current loop I2, and the fourth current loop I4 is the total current output by the driving power supply 11, and this total current will flow back to the driving power supply 11.

[0033] In the high color temperature mode, the current of the second current loop I2 is much larger than the current of the first current loop I1 and the current of the fourth current loop I4. For example, the difference between the current of the second current loop I2 and the current of the first current loop I3 is greater than or equal to 97% of the total current, but less than 10% of the total current. For example, the difference between the current of the second current loop I2 and the current of the fourth current loop I4 is greater than or equal to 97% of the total current, but less than 10% of the total current. The current of the first current loop I1 is close to the current of the fourth current loop I4. For example, the current of the first current loop I1 and the current of the fourth current loop I4 are both equal to 1% of the total current. For example, the difference between the current of the first current loop I1 and the current of the fourth current loop I4 is less than 2% of the total current. For example, the current of the second current loop I2 is 98% of the total current; the current of the first current loop I1 is 1% of the total current; the current of the fourth current loop I4 is 1% of the total current. The currents of the first current loop I1, the second current loop I2 and the fourth current loop I4 can be adjusted to achieve the desired color temperature. In the high color temperature mode, there is still a fourth current loop I4 passing through the low color temperature light source 14, so the driving power supply 11 can drive the high color temperature light source 15 with most of the current in the high color temperature mode, and drive the low color temperature light source 14 with a very small current. In this way, in the high color temperature mode, the lighting device 1 mainly outputs high color temperature light from the high color temperature light source 15, and the low color temperature light generated by the low color temperature light source 14 can be mixed with the high color temperature light to enhance the special color rendering property (R9) of the mixed light.

[0034] When the user operates the switch circuit 12 to enter the low color temperature mode, the switch circuit 12 switches so that the driving power supply 11 forms a first current loop I1 passing through the switch circuit 12, a third current loop I3 passing through the low color temperature light source 14 and the switch circuit 12, and a fourth current loop I4 passing through the high color temperature light source 15, the switch circuit 12, and the regulating circuit 13. The sum of the currents of the first current loop I1, the second current loop I2, and the fourth current loop I4 is the total current output by the driving power supply 11, and this total current will flow back to the driving power supply 11.

[0035] In the low color temperature mode, the current of the third current loop I3 is much larger than the current of the first current loop I1 and the current of the fourth current loop I4. For example, the difference between the current of the third current loop I3 and the current of the first current loop I3 is greater than or equal to 97% of the total current, but less than 10% of the total current. For example, the difference between the current of the third current loop I3 and the current of the fourth current loop I4 is greater than or equal to 97% of the total current, but less than 10% of the total current. The current of the first current loop I1 is close to the current of the fourth current loop I4. For example, the current of the first current loop I1 and the current of the fourth current loop I4 are both equal to 1% of the total current. For example, the difference between the current of the first current loop I1 and the current of the fourth current loop I4 is less than 2% of the total current. For example, the current of the third current loop I3 is 98% of the total current; the current of the first current loop I1 is 1% of the total current; the current of the fourth current loop I4 is 1% of the total current. The currents of the first current loop I1, the third current loop I3 and the fourth current loop I4 can be adjusted to achieve the desired color temperature. In the low color temperature mode, there is still a fourth current loop I4 passing through the high color temperature light source 15, so the driving power supply 11 can drive the low color temperature light source 14 with most of the current in the low color temperature mode, and drive the high color temperature light source 15 with a very small current. In this way, in the low color temperature mode, the lighting device 1 mainly outputs low color temperature light from the low color temperature light source 14, and the high color temperature light generated by the high color temperature light source 15 can be mixed with the low color temperature light to improve the light effect of the mixed light.

[0036] Through the above circuit design and switch circuit switching mechanism, the driving power supply 11 can form three current loops to drive the low color temperature light source 14 and the high color temperature light source 15, so that the lighting device 1 can actually adjust the color temperature in more gears to meet the needs of different applications. In addition, the current used to drive the low color temperature light source 14 and the high color temperature light source 15 will always be less than the total current.

[0037] In addition, the driving power supply 11 can drive the high color temperature light source 15 with most of the current in the high color temperature mode, and drive the low color temperature light source 14 with a very small current. In this way, the lighting device 1 mainly outputs high color temperature light through the high color temperature light source 15 in the high color temperature mode, and the low color temperature light generated by the low color temperature light source 14 can be mixed with the high color temperature light to enhance the special color rendering properties (R9) of the mixed light. Similarly, the driving power supply 11 can drive the low color temperature light source 14 with most of the current in the low color temperature mode, and drive the high color temperature light source 15 with a very small current. In this way, the lighting device 1 mainly outputs low color temperature light through the low color temperature light source 14 in the low color temperature mode, and the high color temperature light generated by the high color temperature light source 15 can be mixed with the low color temperature light to enhance the light effect of the mixed light.

[0038] As can be seen from the above, the circuit design and switch circuit switching mechanism of the lighting device 1 can be applied to various existing light-emitting diode lighting devices, and can effectively achieve more levels of color temperature adjustment. At the same time, the circuit design and switch circuit switching mechanism of the lighting device 1 can improve the light efficiency and special color rendering (R9) of the lighting device 1. Therefore, the lighting device 1 can be more widely used and more flexible in use.

[0039] Of course, this embodiment is only used for illustration rather than to limit the scope of the present invention. Equivalent modifications or changes made to the lighting device with color temperature adjustment function according to this embodiment should still be included in the patent scope of the present invention.

[0040] It is worth mentioning that, due to the limitation of the circuit structure, the existing light-emitting diode lighting device with color temperature adjustment function has obvious bottlenecks in improving the light efficiency and cannot meet the needs of practical applications. Therefore, the light efficiency performance of the existing light-emitting diode lighting device still needs to be further improved. In contrast, according to an embodiment of the present invention, the lighting device includes a driving power supply, a switching circuit, a low color temperature light source and a high color temperature light source. The switching circuit is connected to the driving power supply. The low color temperature light source is connected to the driving power supply and the switching circuit. The high color temperature light source is connected to the driving power supply and the switching circuit, and the color temperature of the high color temperature light source is greater than the color temperature of the low color temperature light source. The switching of the switching circuit enables the driving power supply to form three current loops to drive the low color temperature light source and the high color temperature light source. As can be seen from the above, through the above circuit design and the switching mechanism of the switching circuit, the driving power supply can form three current loops to drive the low color temperature light source and the high color temperature light source, so that the lighting device can actually adjust the color temperature in more gears to meet the needs of different applications.

[0041] Furthermore, according to an embodiment of the present invention, the lighting device further includes a regulating circuit. The regulating circuit is connected to the switch circuit. The switch circuit is switched so that the driving power supply forms a first current loop passing through the switch circuit, a second current loop passing through the high color temperature light source and the switch circuit, and a fourth current loop passing through the low color temperature light source, the switch circuit and the regulating circuit in the high color temperature mode. The current of the second current loop is much larger than the current of the first current loop and the current of the fourth current loop. The current of the first current loop is close to the current of the fourth current loop. The color temperature of the high color temperature mode is substantially equal to the color temperature of the high color temperature light source. Through the above-mentioned circuit design and switch circuit switching mechanism, the driving power supply can drive the high color temperature light source with most of the current in the high color temperature mode, and drive the low color temperature light source with a very small current. In this way, the lighting device mainly outputs high color temperature light from the high color temperature light source in the high color temperature mode, and the low color temperature light generated by the low color temperature light source can be mixed with the high color temperature light to enhance the special color rendering properties (R9) of the mixed light.

[0042] In addition, according to an embodiment of the present invention, the switching of the switch circuit causes the driving power supply to form a first current loop passing through the switch circuit, a third current loop passing through the low color temperature light source and the switch circuit, and a fourth current loop passing through the high color temperature light source, the switch circuit and the regulating circuit in the low color temperature mode. The current of the third current loop is much larger than the current of the first current loop and the current of the fourth current loop. The current of the first current loop is close to the current of the fourth current loop. The color temperature of the low color temperature mode is substantially equal to the color temperature of the low color temperature light source. Through the above-mentioned circuit design and switch circuit switching mechanism, the driving power supply can drive the low color temperature light source with most of the current in the low color temperature mode, and drive the high color temperature light source with a very small current. In this way, the lighting device mainly outputs low color temperature light by the low color temperature light source in the low color temperature mode, and the high color temperature light generated by the high color temperature light source can be mixed with the low color temperature light to enhance the light effect of the mixed light.

[0043] In addition, according to the embodiments of the present invention, the circuit design and switch circuit switching mechanism of the lighting device can be applied to various existing light-emitting diode lighting devices, and can effectively achieve more levels of color temperature adjustment. At the same time, the circuit design and switch circuit switching mechanism of the lighting device can improve the light efficiency and special color rendering (R9) of the lighting device. Therefore, the lighting device can be more widely used and more flexible in use.

[0044] Furthermore, according to the embodiments of the present invention, the lighting device has a simple design and can achieve the desired effect without significantly increasing the cost. Therefore, the lighting device can achieve high practicality to meet the needs of different applications and meet the trend of future development. From the above, it can be seen that the lighting device with color temperature adjustment function according to the embodiments of the present invention can indeed achieve excellent technical effects.

[0045] See also Figure 2 , which is a circuit diagram of a switch circuit of a lighting device with a color temperature adjustment function according to a second embodiment of the present invention (including a portion of a driving circuit 11 and a regulating circuit 13), and please also refer to Figure 1 As shown in the figure, the switch circuit 12 includes a stabilizing unit SU, a switch SW (the switch SW has 12 pins P1-P12), a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8. The stabilizing unit SU includes a current consuming resistor Rs and a filter capacitor EC connected in parallel. In one embodiment, the switch SW can be a semiconductor switch component such as a double-row toggle switch, a single-row toggle switch, a photorelay, a metal oxide semiconductor field effect transistor (MOS), a thyristor, etc.

[0046] The regulating circuit 13 includes a shunt resistor Ra. The regulating circuit 13 is connected to the switch circuit 12 (the low color temperature light source 14 and the high color temperature light source 15 are shown in FIG. Figure 1 ).

[0047] The driving circuit 11 includes a positive live wire output terminal L+, a negative live wire output terminal L-, a high color temperature output terminal Ht and a low color temperature output terminal Lt. The positive live wire output terminal L+ is connected to the negative live wire output terminal L- through a stabilizing unit 121. The high color temperature output terminal Ht and the low color temperature output terminal Lt are both connected to a switch SW. In addition, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8 are distributed between the high color temperature output terminal Ht and the low color temperature output terminal Lt and the switch SW. The first resistor R1 and the second resistor R2 are connected in parallel. The third resistor R3 and the fourth resistor R4 are connected in parallel. The fifth resistor R5 and the sixth resistor R6 are connected in parallel. The seventh resistor R7 and the eighth resistor R8 are connected in parallel. The high color temperature output terminal Ht outputs current to the high color temperature light source 15, and the low color temperature output terminal Lt outputs current to the low color temperature light source 14.

[0048] Of course, this embodiment is only used for illustration rather than to limit the scope of the present invention. Equivalent modifications or changes made to the lighting device with color temperature adjustment function according to this embodiment should still be included in the patent scope of the present invention.

[0049] See also Figure 3 , which is a schematic diagram of a high color temperature mode of a switch circuit of an illumination device with a color temperature adjustment function according to a second embodiment of the present invention, and please also refer to Figure 1 and Figure 2 As shown in the figure, when the user operates the switch circuit 12 to enter the high color temperature mode, the switch circuit 12 switches so that the driving power supply 11 forms a first current loop I1 passing through the switch circuit 12, a second current loop I2 passing through the high color temperature light source 15 and the switch circuit 12, and a fourth current loop I4 passing through the low color temperature light source 14, the switch circuit 12 and the adjustment circuit 13.

[0050] The first current loop I1 is output from the positive live wire output terminal L+ of the driving power supply 11 and returns to the negative live wire output terminal L- of the driving power supply 11 through the stabilizing unit SU (current consumption resistor Rs), and the filter capacitor EC can achieve a filtering effect. The current of the first current loop I1 is 1% of the total current. In addition, when the lighting device 1 is turned off, the filter capacitor EC is discharged.

[0051] The second current loop I2 passes through the high color temperature light source 15 and is output from the high color temperature output terminal Ht of the driving power supply 11, and then is divided into two currents. One current returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P1 and P3 of the switch SW. The other current returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P12 and P10 of the switch SW. The current of the second current loop I2 is 98% of the total current.

[0052] The fourth current loop I4 passes through the low color temperature light source 14 and is output from the low color temperature output terminal Lt of the driving power supply 11, and is further divided into two current paths through the first resistor R1, the second resistor R2 and the adjustment circuit 13. One current path returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P1 and P3 of the switch SW. The other current path returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P12 and P10 of the switch SW. The current of the fourth current loop I4 is 1% of the total current.

[0053] Similarly, when the user operates the switch circuit 12 to enter the low color temperature mode, the switch circuit 12 switches so that the driving power supply 11 forms a first current loop I1 passing through the switch circuit 12, a third current loop I3 passing through the low color temperature light source 14 and the switch circuit 12, and a fourth current loop I4 passing through the high color temperature light source 15, the switch circuit 12 and the adjustment circuit 13.

[0054] The first current loop I1 is output from the positive live wire output terminal L+ of the driving power supply 11 and returns to the negative live wire output terminal L- of the driving power supply 11 through the stabilizing unit SU (current consumption resistor Rs), and the filter capacitor EC can achieve a filtering effect. The current of the first current loop I1 is 1% of the total current. In addition, when the lighting device 1 is turned off, the filter capacitor EC is discharged.

[0055] The third current loop I3 passes through the low color temperature light source 15 and is output from the low color temperature output terminal Lt of the driving power supply 11, and then is divided into two currents. One current returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P7 and P10 of the switch SW. The other current returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P6 and P3 of the switch SW. The current of the third current loop I3 accounts for 98% of the total current.

[0056] The fourth current loop I4 passes through the high color temperature light source 15 and is output from the high color temperature output terminal Ht of the driving power supply 11, and is further divided into two current paths through the regulating circuit 13, the first resistor R1 and the second resistor R2. One current path returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P7 and P10 of the switch SW. The other current path returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P6 and P3 of the switch SW. The current of the fourth current loop I4 is 1% of the total current.

[0057] Similarly, when the user operates the switch circuit 12 to enter the 5000K mode (intermediate color temperature mode), the switch circuit 12 switches so that the driving power supply 11 forms a first current loop I1 passing through the switch circuit 12, a second current loop I2 passing through the high color temperature light source 15 and the switch circuit 12, and a third current loop I3 passing through the low color temperature light source 14 and the switch circuit 12.

[0058] The first current loop I1 is output from the positive live wire output terminal L+ of the driving power supply 11 and returns to the negative live wire output terminal L- of the driving power supply 11 through the stabilizing unit SU (current consumption resistor Rs), and the filter capacitor EC can achieve a filtering effect. In addition, when the lighting device 1 is turned off, the filter capacitor EC is discharged.

[0059] The second current loop I2 passes through the high color temperature light source 15 and is output from the high color temperature output terminal Ht of the driving power supply 11 , and then returns to the negative live wire output terminal L− of the driving power supply 11 through the pins P2 and P3 of the switch SW.

[0060] The third current loop I3 passes through the low color temperature light source 15 and is output from the low color temperature output terminal Lt of the driving power supply 11, then passes through the first resistor R1 and the second resistor R2, and finally returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P11 and P10 of the switch SW. In the intermediate color temperature mode, no current flows through the regulating circuit 13.

[0061] Similarly, when the user operates the switch circuit 12 to enter the 4000K mode (intermediate color temperature mode), the switch circuit 12 switches so that the driving power supply 11 forms a first current loop I1 passing through the switch circuit 12, a second current loop I2 passing through the high color temperature light source 15 and the switch circuit 12, and a third current loop I3 passing through the low color temperature light source 14 and the switch circuit 12.

[0062] The first current loop I1 is output from the positive live wire output terminal L+ of the driving power supply 11 and returns to the negative live wire output terminal L- of the driving power supply 11 through the stabilizing unit SU (current consumption resistor Rs), and the filter capacitor EC can achieve a filtering effect. In addition, when the lighting device 1 is turned off, the filter capacitor EC is discharged.

[0063] The second current loop I2 passes through the high color temperature light source 15 and is output from the high color temperature output terminal Ht of the driving power supply 11, then passes through the fifth resistor R5 and the sixth resistor R6, and finally returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P4 and P3 of the switch SW.

[0064] The third current loop I3 passes through the low color temperature light source 15 and is output from the low color temperature output terminal Lt of the driving power supply 11, then passes through the third resistor R3 and the fourth resistor R4, and finally returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P9 and P10 of the switch SW. In the intermediate color temperature mode, no current flows through the regulating circuit 13.

[0065] Similarly, when the user operates the switch circuit 12 to enter the 3500K mode (intermediate color temperature mode), the switch circuit 12 switches so that the driving power supply 11 forms a first current loop I1 passing through the switch circuit 12, a second current loop I2 passing through the high color temperature light source 15 and the switch circuit 12, and a third current loop I3 passing through the low color temperature light source 14 and the switch circuit 12.

[0066] The first current loop I1 is output from the positive live wire output terminal L+ of the driving power supply 11 and returns to the negative live wire output terminal L- of the driving power supply 11 through the stabilizing unit SU (current consumption resistor Rs), and the filter capacitor EC can achieve a filtering effect. In addition, when the lighting device 1 is turned off, the filter capacitor EC is discharged.

[0067] The second current loop I2 passes through the high color temperature light source 15 and is output from the high color temperature output terminal Ht of the driving power supply 11, then passes through the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8, and finally returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P5 and P3 of the switch SW.

[0068] The third current loop I3 passes through the low color temperature light source 15 and is output from the low color temperature output terminal Lt of the driving power supply 11, and then returns to the negative live wire output terminal L- of the driving power supply 11 through the pins P8 and P10 of the switch SW. In the intermediate color temperature mode, no current flows through the regulating circuit 13.

[0069] The operating mechanisms of other intermediate color temperatures are similar to the above mechanisms, so they will not be elaborated here.

[0070] The test can be performed by changing the currents of the first current loop I1, the second current loop I2 and the third current loop I3 to obtain different currents corresponding to color temperature values. In this way, the desired color temperature can be achieved by controlling the currents of the first current loop I1, the second current loop I2 and the third current loop I3.

[0071] The circuit design of the switch circuit 12 can be changed according to actual needs and is not limited to the circuit design of this embodiment.

[0072] Through the above circuit design and switch circuit switching mechanism, the driving power supply 11 can form three current loops to drive the low color temperature light source 14 and the high color temperature light source 15, so that the lighting device 1 can actually adjust the color temperature in more gears to meet the needs of different applications. In addition, the current used to drive the low color temperature light source 14 and the high color temperature light source 15 will always be less than the total current.

[0073] In addition, the driving power supply 11 can drive the high color temperature light source 15 with most of the current in the high color temperature mode, and drive the low color temperature light source 14 with a very small current. In this way, the lighting device 1 mainly outputs high color temperature light through the high color temperature light source 15 in the high color temperature mode, and the low color temperature light generated by the low color temperature light source 14 can be mixed with the high color temperature light to enhance the special color rendering properties (R9) of the mixed light. Similarly, the driving power supply 11 can drive the low color temperature light source 14 with most of the current in the low color temperature mode, and drive the high color temperature light source 15 with a very small current. In this way, the lighting device 1 mainly outputs low color temperature light through the low color temperature light source 14 in the low color temperature mode, and the high color temperature light generated by the high color temperature light source 15 can be mixed with the low color temperature light to enhance the light effect of the mixed light.

[0074] As can be seen from the above, the circuit design and switch circuit switching mechanism of the lighting device 1 can be applied to various existing light-emitting diode lighting devices, and can effectively achieve more levels of color temperature adjustment. At the same time, the circuit design and switch circuit switching mechanism of the lighting device 1 can improve the light efficiency and special color rendering (R9) of the lighting device 1. Therefore, the lighting device 1 can be more widely used and more flexible in use.

[0075] Of course, this embodiment is only used for illustration rather than to limit the scope of the present invention. Equivalent modifications or changes made to the lighting device with color temperature adjustment function according to this embodiment should still be included in the patent scope of the present invention.

[0076] In summary, according to an embodiment of the present invention, the lighting device includes a driving power supply, a switching circuit, a low color temperature light source and a high color temperature light source. The switching circuit is connected to the driving power supply. The low color temperature light source is connected to the driving power supply and the switching circuit. The high color temperature light source is connected to the driving power supply and the switching circuit, and the color temperature of the high color temperature light source is greater than the color temperature of the low color temperature light source. The switching circuit switches the driving power supply to form three current loops to drive the low color temperature light source and the high color temperature light source. As can be seen from the above, through the above circuit design and the switching mechanism of the switching circuit, the driving power supply can form three current loops to drive the low color temperature light source and the high color temperature light source, so that the lighting device can actually adjust the color temperature in more gears to meet the needs of different applications.

[0077] Furthermore, according to an embodiment of the present invention, the lighting device further includes a regulating circuit. The regulating circuit is connected to the switch circuit. The switch circuit is switched so that the driving power supply forms a first current loop passing through the switch circuit, a second current loop passing through the high color temperature light source and the switch circuit, and a fourth current loop passing through the low color temperature light source, the switch circuit and the regulating circuit in the high color temperature mode. The current of the second current loop is much larger than the current of the first current loop and the current of the fourth current loop. The current of the first current loop is close to the current of the fourth current loop. The color temperature of the high color temperature mode is substantially equal to the color temperature of the high color temperature light source. Through the above-mentioned circuit design and switch circuit switching mechanism, the driving power supply can drive the high color temperature light source with most of the current in the high color temperature mode, and drive the low color temperature light source with a very small current. In this way, the lighting device mainly outputs high color temperature light from the high color temperature light source in the high color temperature mode, and the low color temperature light generated by the low color temperature light source can be mixed with the high color temperature light to enhance the special color rendering properties (R9) of the mixed light.

[0078] In addition, according to an embodiment of the present invention, the switching of the switch circuit causes the driving power supply to form a first current loop passing through the switch circuit, a third current loop passing through the low color temperature light source and the switch circuit, and a fourth current loop passing through the high color temperature light source, the switch circuit and the regulating circuit in the low color temperature mode. The current of the third current loop is much larger than the current of the first current loop and the current of the fourth current loop. The current of the first current loop is close to the current of the fourth current loop. The color temperature of the low color temperature mode is substantially equal to the color temperature of the low color temperature light source. Through the above-mentioned circuit design and switch circuit switching mechanism, the driving power supply can drive the low color temperature light source with most of the current in the low color temperature mode, and drive the high color temperature light source with a very small current. In this way, the lighting device mainly outputs low color temperature light by the low color temperature light source in the low color temperature mode, and the high color temperature light generated by the high color temperature light source can be mixed with the low color temperature light to enhance the light effect of the mixed light.

[0079] In addition, according to the embodiments of the present invention, the circuit design and switch circuit switching mechanism of the lighting device can be applied to various existing light-emitting diode lighting devices, and can effectively achieve more levels of color temperature adjustment. At the same time, the circuit design and switch circuit switching mechanism of the lighting device can improve the light efficiency and special color rendering (R9) of the lighting device. Therefore, the lighting device can be more widely used and more flexible in use.

[0080] Furthermore, according to the embodiments of the present invention, the lighting device has a simple design and can achieve the desired effect without significantly increasing the cost. Therefore, the lighting device can achieve high practicality to meet the needs of different applications and meet the trend of future development.

[0081] It should be noted that, although the above embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent process changes made using the contents of the present specification and drawings, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the patent of the present invention.

Claims

1. A lighting device with a color temperature adjustment function, characterized in that: include: Driving power supply; A switch circuit connected to the driving power supply; A low color temperature light source connected to the driving power supply and the switching circuit; as well as A high color temperature light source is connected to the driving power supply and the switching circuit, and the color temperature of the high color temperature light source is greater than the color temperature of the low color temperature light source; The switch circuit switches so that the driving power source forms three current loops to drive the low color temperature light source and the high color temperature light source.

2. The lighting device with color temperature adjustment function according to claim 1, characterized in that: The switching of the switch circuit causes the driving power supply to form a first current loop passing through the switch circuit, a second current loop passing through the high color temperature light source and the switch circuit, and a third current loop passing through the low color temperature light source and the switch circuit in the intermediate color temperature mode, the current of the second current loop is close to the current of the third current loop, and the current of the second current loop and the current of the third current loop are much larger than the current of the first current loop, and the color temperature of the intermediate color temperature mode is lower than the color temperature of the high color temperature light source but higher than the color temperature of the low color temperature light source.

3. The lighting device with color temperature adjustment function according to claim 2, characterized in that: The switch circuit has a stabilizing unit, which includes a current consumption resistor and a filter capacitor connected in parallel with each other, and the first current loop passes through the stabilizing unit.

4. The lighting device with color temperature adjustment function according to claim 1, characterized in that: The invention also includes a regulating circuit, which is connected to the switching circuit. The switching circuit is switched so that the driving power supply forms a first current loop passing through the switching circuit, a second current loop passing through the high color temperature light source and the switching circuit, and a fourth current loop passing through the low color temperature light source, the switching circuit and the regulating circuit in the high color temperature mode. The current of the second current loop is much larger than the current of the first current loop and the current of the fourth current loop, while the current of the first current loop is close to the current of the fourth current loop. The color temperature of the high color temperature mode is substantially equal to the color temperature of the high color temperature light source.

5. The lighting device with color temperature adjustment function according to claim 4, characterized in that: The switch circuit has a stabilizing unit, which includes a current consumption resistor and a filter capacitor connected in parallel with each other, and the first current loop passes through the stabilizing unit.

6. The lighting device with color temperature adjustment function according to claim 1, characterized in that: The invention also includes a regulating circuit, which is connected to the switching circuit. The switching circuit switches so that the driving power supply forms a first current loop passing through the switching circuit, a third current loop passing through the low color temperature light source and the switching circuit, and a fourth current loop passing through the high color temperature light source, the switching circuit and the regulating circuit in the low color temperature mode. The current of the third current loop is much larger than the current of the first current loop and the current of the fourth current loop, while the current of the first current loop is close to the current of the fourth current loop. The color temperature of the low color temperature mode is substantially equal to the color temperature of the low color temperature light source.

7. The lighting device with color temperature adjustment function according to claim 6, characterized in that: The switch circuit has a stabilizing unit, which includes a current consumption resistor and a filter capacitor connected in parallel with each other, and the first current loop passes through the stabilizing unit.

8. The lighting device with color temperature adjustment function according to claim 1, characterized in that: The low color temperature light source and the high color temperature light source are light emitting diodes.

9. The lighting device with color temperature adjustment function according to claim 1, characterized in that: The color temperature of the high color temperature light source is 2 to 3 times the color temperature of the low color temperature light source.

10. The lighting device with color temperature adjustment function according to claim 1, characterized in that: The driving power source is a light emitting diode driver.

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