CN221043270U - Color mixing LED lighting system and dimming control circuit thereof - Google Patents
Color mixing LED lighting system and dimming control circuit thereof Download PDFInfo
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Abstract
The utility model relates to a color mixing LED lighting system and a dimming control circuit thereof, wherein the dimming control circuit is connected with a first control circuit and a second control circuit through a voltage dividing module, so that the initial voltage of a capacitor in a non-working control circuit is improved, the initial voltage of the capacitor is slightly lower than the forward voltage drop of a corresponding light emitting module, the charging time of the capacitor is shortened, the light emitting module can be lightened in a short time when the color temperature is switched, the extinguishing time and the lightening time of the light emitting module are kept consistent as much as possible, the phenomenon of firstly extinguishing and then lightening can not occur in the dimming process, the color temperature is switched smoothly, and the user experience is improved.
Description
Technical Field
The utility model relates to the technical field of LEDs, in particular to a color mixing LED lighting system and a dimming control circuit thereof.
Background
In the related art, a color mixing LED lighting system includes at least two light emitting modules of different colors or color temperatures, each of which is controlled by an independent control circuit. As shown in fig. 1, when only yellow light is required to be turned on, the control circuit for controlling the yellow light is operated; when only white light is required to be turned on, the control circuit for controlling the white light works; when mixing is desired, pulse width modulation (Pulse Width Modulation, PWM) of the yellow and white light is controlled to adjust the output different color temperatures of the mixed light. However, when the color temperature is switched, the color temperature is not switched smoothly, and the yellow light is switched to the white light for example, the yellow light is turned off at a higher speed than the white light, and the process of turning off before on is performed, so that the user experience effect is poor.
Disclosure of utility model
In order to solve the technical problems, the utility model provides a color mixing LED lighting system and a dimming control circuit thereof.
In a first aspect, the present utility model provides a dimming control circuit for a color mixing LED lighting system, comprising:
a first control circuit configured to control the first light emitting module to emit light; the first control circuit comprises a first capacitor, and the first capacitor is connected with the first light-emitting module in parallel;
A second control circuit configured to control the second light emitting module to emit light; the second control circuit comprises a second capacitor, and the second capacitor is connected with the second light-emitting module in parallel;
A voltage dividing module; one end of the voltage dividing module is connected with the positive electrode of the first capacitor, and the other end of the voltage dividing module is connected with the positive electrode of the second capacitor;
The voltage dividing module is used for controlling the voltage of the first capacitor to be smaller than the forward voltage drop of the first light emitting module when the first control circuit does not work and the second control circuit works, and the difference value between the forward voltage drop of the first light emitting module and the voltage of the first capacitor is smaller than or equal to a first preset threshold value; and when the first control circuit works and the second control circuit does not work, controlling the voltage of the second capacitor to be smaller than the forward voltage drop of the second light emitting module, and enabling the difference value between the forward voltage drop of the second light emitting module and the voltage of the second capacitor to be smaller than or equal to a second preset threshold value.
Optionally, the voltage dividing module includes: a first voltage dividing element and a second voltage dividing element;
The negative electrode of the first voltage dividing element is connected with the positive electrode of the first capacitor, the positive electrode of the first voltage dividing element is connected with the positive electrode of the second voltage dividing element, and the negative electrode of the second voltage dividing element is connected with the positive electrode of the second capacitor;
Or alternatively
The positive pole of the first voltage dividing element is connected with the positive pole of the first capacitor, the negative pole of the first voltage dividing element is connected with the negative pole of the second voltage dividing element, and the positive pole of the second voltage dividing element is connected with the positive pole of the second capacitor.
Optionally, the first voltage dividing element includes a first voltage stabilizing tube, and the second voltage dividing element includes a second voltage stabilizing tube.
Optionally, the dimming control circuit further comprises: a current limiting module;
The current limiting module is connected with the voltage dividing module in series; the current limiting module is used for reducing the current value flowing through the voltage dividing module.
Optionally, the current limiting module is located between the first voltage dividing element and the second voltage dividing element.
Optionally, the current limiting module includes a current limiting resistor.
Optionally, the current limiting resistor comprises an adjustable resistor.
Optionally, the first control circuit further includes: a first power input; the first power input end is connected with the positive electrode of the first capacitor; the negative electrode of the first capacitor is grounded;
the second control circuit further includes: a second power input; the second power input end is connected with the positive electrode of the second capacitor; the negative electrode of the second capacitor is grounded.
Optionally, the first control circuit further includes: a first driving chip; the first end of the first driving chip is connected with the first power input end, the second end of the first driving chip is connected with the negative electrode of the first capacitor, and the third end of the first driving chip is grounded; the second control circuit further includes: a second driving chip; the first end of the second driving chip is connected with the second power input end, the second end of the second driving chip is connected with the negative electrode of the second capacitor, and the third end of the second driving chip is grounded.
In a second aspect, the present utility model also provides a color mixing LED lighting system, comprising: the first light-emitting module, the second light-emitting module and any one of the dimming control circuits.
Compared with the prior art, the technical scheme provided by the utility model has the following advantages:
the utility model provides a dimming control circuit of a color mixing LED lighting system, which comprises: a first control circuit configured to control the first light emitting module to emit light; the first control circuit comprises a first capacitor which is connected with the first light-emitting module in parallel; a second control circuit configured to control the second light emitting module to emit light; the second control circuit comprises a second capacitor which is connected with the second light-emitting module in parallel; a voltage dividing module; one end of the voltage dividing module is connected with the positive electrode of the first capacitor, and the other end of the voltage dividing module is connected with the positive electrode of the second capacitor; the voltage dividing module is used for controlling the voltage of the first capacitor to be smaller than the forward voltage drop of the first light emitting module when the first control circuit does not work and the second control circuit works, and the difference value between the forward voltage drop of the first light emitting module and the voltage of the first capacitor is smaller than or equal to a first preset threshold value; and the voltage control circuit is used for controlling the voltage of the second capacitor to be smaller than the forward voltage drop of the second light-emitting module when the first control circuit works and the second control circuit does not work, and the difference value between the forward voltage drop of the second light-emitting module and the voltage of the second capacitor is smaller than or equal to a second preset threshold value. So set up, connect first control circuit and second control circuit through voltage dividing module, the initial voltage of electric capacity in the control circuit that has improved the work, make the initial voltage of electric capacity slightly be less than the forward voltage drop of corresponding light emitting module, thereby shortened the charge duration of electric capacity, when carrying out the colour temperature switching, can light emitting module in the short time, make light emitting module's extinction time and the time of lighting keep unanimous as far as possible, the phenomenon of going out earlier and then bright can not appear in the dimming process, the colour temperature switching can smooth transition, user experience feel has been promoted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a dimming control circuit of a color mixing LED lighting system in the related art;
Fig. 2 is a schematic structural diagram of a dimming control circuit of a color mixing LED lighting system according to the present utility model;
Fig. 3 is a schematic structural diagram of a dimming control circuit of another color mixing LED lighting system according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a dimming control circuit of a color mixing LED lighting system according to another embodiment of the present utility model;
fig. 5 is a schematic structural diagram of a dimming control circuit of a color mixing LED lighting system according to another embodiment of the present utility model;
Fig. 6 is a schematic structural diagram of a dimming control circuit of a color mixing LED lighting system according to another embodiment of the present utility model;
fig. 7 is a schematic structural diagram of a dimming control circuit of a color mixing LED lighting system according to another embodiment of the present utility model;
fig. 8 is a schematic structural diagram of a dimming control circuit of a color mixing LED lighting system according to another embodiment of the present utility model;
Fig. 9 is a schematic structural diagram of a dimming control circuit of another color mixing LED lighting system according to an embodiment of the present utility model.
Detailed Description
In order that the above objects, features and advantages of the utility model will be more clearly understood, a further description of the utility model will be made. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the utility model.
In the related art, as shown in fig. 1, the dimming control circuit of the color mixing LED lighting system includes two mutually independent dimming control circuits, one of which is used for controlling the LED load in the circuit to emit yellow light, and the other of which is used for controlling the LED load in the circuit to emit white light; when the color mixing LED lighting system needs to output yellow light, only the yellow light control circuit is controlled to work, and the white light control circuit does not work; when the mixed-color LED lighting system needs to output white light, only the white light control circuit is controlled to work, and the yellow light control circuit does not work; when light mixing is required, the yellow light control circuit and the white light control circuit work simultaneously. Taking the case of switching from yellow light to white light as an example, before the color temperature is switched, the color-mixed LED lighting system outputs yellow light, at the moment, the yellow light control circuit works, the C4 'capacitor in the yellow light control circuit has voltage which is slightly larger than the forward voltage drop of the LED load (yellow light), the LED load (yellow light) emits yellow light, the white light control circuit does not work, the C5' capacitor in the white light control circuit has no voltage or has lower voltage, and the LED load (white light) does not emit light; when the color temperature is switched, the yellow light control circuit does not work, the white light control circuit works, at the moment, the C4 'capacitor in the yellow light control circuit discharges, the voltage of the C4' capacitor gradually decreases, when the voltage of the C4 'capacitor is lower than the forward voltage drop of the LED load (yellow light), the LED load (yellow light) is immediately extinguished, the power generation time of the C4' capacitor is relatively short, and the switching time of the corresponding LED load (yellow light) from the on state to the off state is relatively short; the voltage of the C5 'capacitor in the white light control circuit is gradually increased, when the voltage of the C5' capacitor is higher than the forward voltage drop of the LED load (white light), the LED load (white light) is lightened, and because the initial voltage of the C5 'capacitor is lower, the charging time of the C5' capacitor is longer, and the switching time of the corresponding LED load (white light) from the extinction state to the lightening state is longer, so that the yellow light extinction speed is higher than the white light lightening speed. Similarly, when white light is switched to yellow light, the white light extinguishes faster than the yellow light is lit. Therefore, when the color temperature is switched, the color temperature is not switched smoothly, the phenomenon that the color temperature is switched off first and then is bright can be generated, and the user experience effect is poor.
In order to solve the technical problems set forth in the technical section above, embodiments of the present utility model provide a color mixing LED lighting system and a dimming control circuit thereof, wherein the dimming control circuit includes: a first control circuit configured to control the first light emitting module to emit light; the first control circuit comprises a first capacitor which is connected with the first light-emitting module in parallel; a second control circuit configured to control the second light emitting module to emit light; the second control circuit comprises a second capacitor which is connected with the second light-emitting module in parallel; a voltage dividing module; one end of the voltage dividing module is connected with the positive electrode of the first capacitor, and the other end of the voltage dividing module is connected with the positive electrode of the second capacitor; the voltage dividing module is used for controlling the voltage of the first capacitor to be smaller than the forward voltage drop of the first light emitting module when the first control circuit does not work and the second control circuit works, and the difference value between the forward voltage drop of the first light emitting module and the voltage of the first capacitor is smaller than or equal to a first preset threshold value; and the voltage control circuit is used for controlling the voltage of the second capacitor to be smaller than the forward voltage drop of the second light-emitting module when the first control circuit works and the second control circuit does not work, and the difference value between the forward voltage drop of the second light-emitting module and the voltage of the second capacitor is smaller than or equal to a second preset threshold value. So set up, connect first control circuit and second control circuit through voltage dividing module, the initial voltage of electric capacity in the control circuit of non-operating condition has been improved, make the initial voltage of electric capacity slightly be less than the forward voltage drop of corresponding light emitting module, thereby the length of time of charging of electric capacity has been shortened, when carrying out the colour temperature switching, can light emitting module in the short time, make light emitting module's extinction time keep unanimous with the time of lighting as far as possible, the phenomenon of going out earlier and then bright can not appear in the dimming process, the colour temperature switching can smooth transition, user experience feel has been promoted.
The following describes an exemplary embodiment of a color mixing LED lighting system and a dimming control circuit thereof according to the present utility model with reference to the accompanying drawings.
In some embodiments, as shown in fig. 2, a schematic structure diagram of a dimming control circuit of a color mixing LED lighting system is provided in the present utility model. Referring to fig. 2, the dimming control circuit includes: a first control circuit configured to control the first light emitting module 2 to emit light; the first control circuit comprises a first capacitor 1, and the first capacitor 1 is connected with the first light emitting module 2 in parallel; a second control circuit configured to control the second light emitting module 4 to emit light; the second control circuit comprises a second capacitor 3, and the second capacitor 3 is connected with the second light-emitting module 4 in parallel; a voltage dividing module 5; one end of the voltage dividing module 5 is connected with the positive electrode of the first capacitor 1, and the other end of the voltage dividing module is connected with the positive electrode of the second capacitor 3; the voltage dividing module 5 is used for controlling the voltage of the first capacitor 1 to be smaller than the forward voltage drop of the first light emitting module 2 when the first control circuit does not work and the second control circuit works, and the difference value between the forward voltage drop of the first light emitting module 2 and the voltage of the first capacitor 1 is smaller than or equal to a first preset threshold value; and when the first control circuit is operated and the second control circuit is not operated, controlling the voltage of the second capacitor 3 to be smaller than the forward voltage drop of the second light emitting module 4, and the difference between the forward voltage drop of the second light emitting module 4 and the voltage of the second capacitor 3 to be smaller than or equal to a second preset threshold.
The first control circuit is used for controlling the first light-emitting module 2 to emit light, the second control circuit is used for controlling the second light-emitting module 4 to emit light, and the color temperatures or colors of the first light-emitting module 2 and the second light-emitting module 4 are different; for example, the first light emitting module 2 emits yellow light and the second light emitting module 4 emits white light. The color temperatures of the first and second light emitting modules 2 and 4 may be set to all color temperatures or colors known to those skilled in the art, which is not limited herein. The first light emitting module 2 and the second light emitting module 4 may be a single LED lamp, or may be an LED lamp group or an LED chip, which is not limited herein.
The positive electrode of the first capacitor 1 is connected with the first power input end, the negative electrode of the first capacitor 1 is grounded, and the first light-emitting module 2 is connected with the first capacitor 1 in parallel; the positive pole of second electric capacity 3 is connected with second power input, and the negative pole ground connection of second electric capacity 3, second light emitting module 4 is parallelly connected with second electric capacity 3. The first capacitor 1 and the second capacitor 3 function to reduce voltage fluctuation, thereby improving light emission stability of the first light emitting module 2 and the second light emitting module 4. Illustratively, as shown in fig. 1, power is supplied to the first control circuit through a first power input terminal, the power voltage is a first voltage V1, power is supplied to the second control circuit through a second power input terminal, and the power voltage is the first voltage V1.
The voltage dividing module 5 is connected between the first control circuit and the second control circuit, specifically: one end of the voltage dividing module 5 is connected with the positive electrode of the first capacitor 1, and the other end of the voltage dividing module is connected with the positive electrode of the second capacitor 3.
Illustratively, when the first control circuit is in the inactive state and the second control circuit is in the active state, the first power input terminal does not provide power to the first control circuit, and the second power transmission source input terminal provides power to the second control circuit, the voltage dividing module 5 forms a series circuit with the first capacitor 1, and the series circuit is connected in parallel with the second capacitor 3. Assuming that the power supply voltage provided by the second power supply input end to the second control circuit is a first voltage V1, the voltage corresponding to the voltage division module is Vd, at this time, the voltage U2 of the second capacitor 3 is equal to V1, and the voltage U1 of the first capacitor is equal to the voltage U2 of the second capacitor 3 minus the voltage Vd of the voltage division module 5, i.e., u1=v1-Vd. The voltage U2 of the second capacitor 3 is larger than the forward voltage drop Vf2 of the second light emitting module 4, and the second light emitting module 4 emits light; only when the voltage U1 of the first capacitor 1 is larger than the forward voltage drop Vf1 of the first light emitting module 2, the first light emitting module 2 emits light, the voltage Vd of the voltage dividing module 5 is controlled to enable the voltage U1 of the first capacitor 1 to be smaller than the forward voltage drop Vf1 of the first light emitting module 2, and the difference value between the forward voltage drop Vf1 and the voltage U1 of the first capacitor 1 is smaller than or equal to a first preset threshold value K1, namely 0 < Vf1- (V1-Vd) is smaller than or equal to K1, so that the voltage U1 of the first capacitor 1 is slightly smaller than the forward voltage drop Vf1 of the first light emitting module 2. When the color temperature is switched, the initial voltage of the first capacitor 1 for starting charging is V1-Vd, the second light-emitting module 4 can emit light only by increasing the voltage of the first capacitor 1 to be more than Vf1, the charging time of the first capacitor 1 is effectively shortened, the discharging time of the voltage of the second capacitor 3 from V1 to Vf2 is equal to the charging time of the voltage of the first capacitor 1 from V1-Vd to Vf1, namely the extinguishing time of the second light-emitting module 4 is consistent with the lighting time of the first light-emitting module 2, the phenomenon that the first light-emitting module is turned off before the second light-emitting module is avoided in the dimming process, the color temperature switching can be smoothly transited, and the user experience is improved.
When the first control circuit is in an operating state and the second control circuit is in a non-operating state, the first power input end provides power to the first control circuit, the second power transmission source input end does not provide power to the second control circuit, and the voltage dividing module 5 and the second capacitor 3 form a series circuit which is connected in parallel with the first capacitor 1. Assuming that the power supply voltage provided by the first power supply input end to the first control circuit is a first voltage V1, the voltage corresponding to the voltage division module is Vd, at this time, the voltage U1 of the first capacitor 1 is equal to V1, and the voltage U2 of the second capacitor 3 is equal to the voltage U1 of the first capacitor 1 minus the voltage Vd of the voltage division module 5, i.e., u2=v1-Vd. The voltage U1 of the first capacitor 1 is larger than the forward voltage drop Vf1 of the first light emitting module 2, and the first light emitting module 2 emits light; when the voltage U2 of the second capacitor 3 is larger than the forward voltage drop Vf2 of the second light emitting module 4, the second light emitting module 4 emits light, the voltage Vd of the voltage dividing module 5 is controlled to enable the voltage U2 of the second capacitor 3 to be smaller than the forward voltage drop Vf2 of the second light emitting module 4, the difference value between the forward voltage drop Vf2 and the voltage U2 of the second capacitor 3 is smaller than or equal to a second preset threshold K2, namely 0 < Vf2- (V1-Vd) is smaller than or equal to K2, the voltage U2 of the second capacitor 3 is slightly smaller than the forward voltage drop Vf2 of the second light emitting module 4, when the color temperature is switched, the initial voltage of the second capacitor 3 starts to be V1-Vd, the second light emitting module 4 can emit light only by increasing the voltage of the second capacitor 3 to be more than Vf2, the charging duration of the second capacitor 3 is effectively shortened, the discharging duration of the first capacitor 1 is enabled to be reduced to be equal to the charging duration of the second capacitor 3 from V1-Vd to Vf2, namely the first light emitting module is enabled to avoid the fact that the light-off time is equal to the first light emitting module has the first light-off time, and the light-off time is enabled to have the same, and the user experience when the switching is smooth, and the light-off time is avoided.
The forward voltage drop Vf1 of the first light emitting module 2 and the forward voltage drop Vf2 of the second light emitting module 4 may be equal or unequal, and are not limited herein. The range of the second preset threshold value can be determined according to the difference value between the voltage of the first capacitor 1 during normal operation and the forward voltage drop Vf1 of the first light emitting module 2, so that the second preset threshold value is equal to or close to the difference value of the two; the range of the first preset threshold is determined according to the difference between the voltage of the second capacitor 3 in normal operation and the forward voltage drop Vf2 of the second light emitting module 4, so that the first preset threshold is equal to or close to the difference between the two.
When the first control circuit is not operated and the second control circuit is operated, the voltage Vd corresponding to the voltage dividing module 5 should satisfy: V1-Vf1 is smaller than Vd and is smaller than or equal to K1+V1-Vf1, so that the voltage U1 of the first capacitor 1 is smaller than the forward voltage drop Vf1 of the first light emitting module 2, and the difference between the forward voltage drop Vf1 and the voltage U1 of the first capacitor 1 is smaller than or equal to a first preset threshold K1.
When the first control circuit is operated and the second control circuit is not operated, the voltage Vd corresponding to the voltage dividing module 5 should satisfy: V1-Vf2 is smaller than Vd and is less than or equal to K2+V1-Vf2, so that the voltage U2 of the second capacitor 3 is smaller than the forward voltage drop Vf2 of the second light emitting module 4, and the difference between the forward voltage drop Vf2 and the voltage U2 of the second capacitor 3 is smaller than or equal to a second preset threshold K2.
In some embodiments, as shown in fig. 3, the voltage dividing module 5 includes: a first voltage dividing element 51 and a second voltage dividing element 52; the negative electrode of the first voltage dividing element 51 is connected with the positive electrode of the first capacitor 1, the positive electrode of the first voltage dividing element 51 is connected with the positive electrode of the second voltage dividing element 52, and the negative electrode of the second voltage dividing element 52 is connected with the positive electrode of the second capacitor 3;
In some embodiments, as shown in fig. 4, the voltage dividing module 5 includes: a first voltage dividing element 51 and a second voltage dividing element 52; the positive electrode of the first voltage dividing element 51 is connected to the positive electrode of the first capacitor 1, the negative electrode of the first voltage dividing element 51 is connected to the negative electrode of the second voltage dividing element 52, and the positive electrode of the second voltage dividing element 52 is connected to the positive electrode of the second capacitor 3.
The first voltage dividing element 51 and the second voltage dividing element 52 are connected in series, one of the two voltage dividing elements is connected in the forward direction, and the other voltage dividing element is connected in the reverse direction, and the positive electrode of the first voltage dividing element 51 may be connected to the positive electrode of the second voltage dividing element 52, or the negative electrode of the first voltage dividing element 51 may be connected to the negative electrode of the second voltage dividing element 52, which is not limited herein. The voltage Vd of the voltage dividing module is equal to the sum of the voltage Vd1 of the first voltage dividing element 51 and the voltage Vd2 of the second voltage dividing element 52, i.e., vd=vd1+vd2.
Illustratively, as shown in fig. 3, in the dimming control circuit, the positive electrode of the first voltage dividing element 51 is connected to the positive electrode of the second voltage dividing element 52. When the first control circuit is operated and the second control circuit is not operated, the first voltage dividing element 51 is reverse breakdown-conducted, and has a voltage stabilizing characteristic, the voltage across the first voltage dividing element is kept substantially stable, and the second voltage dividing element 52 is forward-conducted. When the first control circuit is not operated and the second control circuit is operated, the second voltage dividing element 52 is reverse breakdown-conducted, and has a voltage stabilizing characteristic at this time, the voltage across the second voltage dividing element is kept substantially stable, and the first voltage dividing element 51 is forward-conducted.
Illustratively, as shown in fig. 4, in the dimming control circuit, the negative electrode of the first voltage dividing element 51 is connected to the negative electrode of the second voltage dividing element 52. When the first control circuit is operated and the second control circuit is not operated, the first voltage dividing element 51 is turned on in the forward direction, the second voltage dividing element 52 is turned on in the reverse direction by breakdown, and the voltage across the first voltage dividing element is maintained substantially stable. When the first control circuit is not operated and the second control circuit is operated, the second voltage dividing element 52 is turned on in the forward direction, the first voltage dividing element 51 is turned on in the reverse direction by breakdown, and at this time, the first voltage dividing element has a voltage stabilizing characteristic, and the voltages at both ends thereof are kept substantially stable.
It should be noted that fig. 3 to 4 only exemplarily show that the number of the first voltage dividing element 51 and the second voltage dividing element 52 is 1, but the dimming control circuit provided by the embodiment of the present utility model is not limited. In other embodiments, the number of the first voltage dividing element 51 and the second voltage dividing element 52 is at least one, and may be two or more, which is not limited herein.
In some embodiments, as shown in fig. 3-4, the first voltage dividing element 51 comprises a first voltage regulator tube and the second voltage dividing element 52 comprises a second voltage regulator tube.
In this embodiment, the voltage dividing element is a voltage stabilizing tube, and all electronic devices with voltage dividing and stabilizing functions known to those skilled in the art, such as a transient voltage suppressor (TRANSIENT VOLTAGE SUPPRESSER, TVS), may be used, which is not limited herein.
In some embodiments, as shown in fig. 5-7, the dimming control circuit further comprises: a current limiting module 6; the current limiting module 6 is connected with the voltage dividing module 5 in series; the current limiting module 6 is used for reducing the current value flowing through the voltage dividing module 5.
The current limiting module 6 is connected in series with the voltage dividing module and is used for limiting the current flowing through the voltage dividing module 5 so as to prevent the voltage dividing module 5 from being burnt out due to overlarge current, and meanwhile, the current limiting module can also play a role in voltage division, and the corresponding voltage is Vd3.
When the first control circuit is operated and the second control circuit is not operated, the voltage U2 of the second capacitor 3 is equal to the voltage U1 of the first capacitor 1 minus the voltage Vd of the voltage dividing module 5 (including the voltage Vd1 of the first voltage dividing element 51 and the voltage Vd2 of the second voltage dividing element 52), and minus the voltage Vd3 of the current limiting module 6, i.e., u2=u1-Vd-vd3=u1-Vd 1-Vd2-Vd3.
When the first control circuit is not operating and the second control circuit is operating, the voltage U1 of the first capacitor 1 is equal to the voltage U2 of the second capacitor 3 minus the voltage Vd of the voltage dividing module 5 (including the voltage Vd1 of the first voltage dividing element 51 and the voltage Vd2 of the second voltage dividing element 52), and minus the voltage Vd3 of the current limiting module 6, i.e., u1=u2-Vd-vd3=u1-Vd 1-Vd2-Vd3.
In some embodiments, as shown in fig. 8, the current limiting module 6 is located between the first voltage dividing element 51 and the second voltage dividing element 52.
In some embodiments, as shown in fig. 9, the current limiting module 6 includes a current limiting resistor.
When the circuit where the current limiting resistor is positioned is stable, the voltage corresponding to the current limiting resistor is smaller and can be ignored. The first voltage dividing element 51 and the second voltage dividing element 52 can be selected, so that the voltage of the capacitor in the non-working control circuit is slightly smaller than the forward voltage drop of the corresponding light emitting module, the corresponding light emitting module does not emit light at the moment, the charging time of the capacitor during color temperature switching is shortened, the light emitting module can be lightened in a short time, the extinguishing time and the lightening time are kept consistent, smooth transition of color temperature switching is realized, the phenomenon of firstly extinguishing and then lightening is avoided, and the user experience is improved.
In some embodiments, the current limiting resistor comprises an adjustable resistor.
The first light emitting module 2 and the second light emitting module 4 may be a single LED lamp or a group of LED lamps, so that the forward voltage drops of the two may be equal or unequal. When the forward voltage drop Vf1 of the first light emitting module 2 is unequal to the forward voltage drop Vf2 of the second light emitting module 4, the voltage dividing module can be conducted in two directions, so that the voltage of the capacitor in the non-working control circuit is slightly smaller than the forward voltage drop of the corresponding light emitting module, and the voltage Vd of the voltage dividing module and the voltage Vd1 of the current limiting resistor are required to have different values in different conducting directions, that is, the resistance value of the voltage dividing module and/or the resistance value of the current limiting resistor can be adjusted.
For example, assuming that the power supply voltages of the first control circuit and the second control circuit are both 22V, the forward voltage drop Vf1 of the first light emitting module 2 is 20V, the forward voltage drop Vf2 of the second light emitting module 4 is 18V, when the first control circuit is operated and the second control circuit is not operated, the voltage U1 of the first capacitor 1 is 22V, which is greater than the forward voltage drop Vf1 of the first light emitting module 2, the first light emitting module 2 emits light, at this time, the voltage U2 of the second capacitor 3 needs to be controlled below 18V, the second light emitting module 4 does not emit light, and the sum of the voltage Vd of the voltage dividing module 5 and the voltage Vd3 of the current limiting module 6 is greater than 4V. When the first control circuit does not work and the second control circuit works, the voltage U2 of the second capacitor 3 is 22V, which is greater than the forward voltage drop Vf2 of the second light emitting module 4, the second light emitting module 4 emits light, at this time, the voltage U1 of the first capacitor 1 needs to be controlled below 20V, the first light emitting module 2 does not emit light, and the sum of the voltage Vd of the voltage dividing module 5 and the voltage Vd3 of the current limiting module 6 is greater than 2V.
In some embodiments, as shown in fig. 3-8, the first control circuit further comprises: a first power input; the first power input end is connected with the positive electrode of the first capacitor 1; the cathode of the first capacitor 1 is grounded; the second control circuit further includes: a second power input; the second power input end is connected with the positive electrode of the second capacitor 3; the negative electrode of the second capacitor 3 is grounded.
The first control circuit is connected with a power supply through a first power input end, and the power supply provides power supply voltage. The second control circuit is connected with the power supply through a second input end, and the power supply provides power supply voltage.
As shown in fig. 3-8, the positive electrode of the first capacitor 1 and the first end of the first light emitting module 2 are connected to the first power input terminal, the negative electrode of the first capacitor 1 and the second end of the first light emitting module 2 are grounded, and the first capacitor 1 is connected in parallel with the first light emitting module 2. The positive electrode of the second capacitor 3 and the first end of the second light-emitting module 4 are both connected with the second power input end, the negative electrode of the second capacitor 3 and the second end of the second light-emitting module 4 are both grounded, and the second capacitor 3 is connected with the second light-emitting module 4 in parallel.
In some embodiments, as shown in fig. 9, the first control circuit further comprises: a first driving chip 7; the first end of the first driving chip 7 is connected with a first power input end, the second end of the first driving chip 7 is connected with the negative electrode of the first capacitor 1, and the third end of the first driving chip 7 is grounded; the second control circuit further includes: a second driving chip 8; the first end of the second driving chip 8 is connected with the second power input end, the second end of the second driving chip 8 is connected with the negative electrode of the second capacitor 3, and the third end of the second driving chip 8 is grounded.
The types of the first driving chip 7 and the second driving chip 8 are not limited in this embodiment, and any type of driving chip known to those skilled in the art may be used, and are not limited herein. The first driving chip 7 is used for switching on or switching off the first control circuit according to the received PWM1 signal, and the second driving chip 8 is used for switching on or switching off the second control circuit according to the received PWM2 signal.
As shown in fig. 9, the first power input terminal is connected to the power pin VDD of the first driving chip 7 and the positive electrode of the first capacitor 1, the power voltage is supplied to the first driving chip 7 and the first capacitor 1, the first light emitting module 2 is connected in parallel to the first capacitor 1, the negative electrode of the first capacitor 1 and the first light emitting module 2 are connected to the connection pin D of the first driving chip 7, and the ground pin GND of the first driving chip 7 is grounded. The second power input end is connected with a power pin VDD of the second driving chip 8 and an anode of the second capacitor 3, and provides power voltage for the second driving chip 8 and the second capacitor 3, the second light emitting module 4 is connected with the second capacitor 3 in parallel, a cathode of the second capacitor 3 and the second light emitting module 4 are connected with a connection pin D of the second driving chip 8, and a ground pin GND of the second driving chip 8 is grounded.
In some embodiments, as shown in fig. 9, a first resistor R1 is disposed on a connection circuit between the first driving chip 7 and the first power input terminal, and a fifth resistor R5 is disposed on a connection circuit between the second driving chip 8 and the second power input terminal. The voltage divider is used for dividing the power supply voltage provided by the power supply so as to meet the voltage required by the normal operation of the driving chip.
In some embodiments, as shown in fig. 9, the first control circuit further includes a regulator tube D1, where the regulator tube D1 is connected in parallel with the first capacitor 1; the second control circuit comprises a voltage stabilizing tube D2, and the voltage stabilizing tube D2 is connected with a second capacitor 3 in parallel. By the arrangement, the stability of working voltages in the first control circuit and the second control circuit is improved.
In some embodiments, the first control circuit further comprises a first inductance L1 and a fourth resistance R4, and the second control circuit further comprises a second inductance L2 and an eighth resistance R8. The arrangement is beneficial to improving the stability of the circuit because the capacitor, the inductor and the resistor form the resonant circuit.
It should be noted that fig. 2 to 9 only exemplarily illustrate that the power supply voltages of the first control circuit and the second control circuit are equal and are both the first voltage V1, but the dimming control circuit provided by the embodiment of the present utility model is not limited. In other embodiments, the power supply voltages of the first control circuit and the second control circuit may be unequal, and the present utility model is not limited thereto.
In other embodiments, the dimming control circuit further includes all electronic devices or constituent units known to those skilled in the art, such as a power module, a power conversion module, and a main control chip, which are not limited herein.
On the basis of the foregoing implementation manner, the embodiment of the present utility model further provides a color mixing LED lighting system, including: the first light emitting module, the second light emitting module and any one of the dimming control circuits have corresponding beneficial effects, and are not repeated here for avoiding repeated description.
Wherein the color or the color temperature of the first light emitting module is different from that of the second light emitting module.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the utility model to enable those skilled in the art to understand or practice the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A dimming control circuit for a color-mixed LED lighting system, comprising:
a first control circuit configured to control the first light emitting module to emit light; the first control circuit comprises a first capacitor, and the first capacitor is connected with the first light-emitting module in parallel;
A second control circuit configured to control the second light emitting module to emit light; the second control circuit comprises a second capacitor, and the second capacitor is connected with the second light-emitting module in parallel;
A voltage dividing module; one end of the voltage dividing module is connected with the positive electrode of the first capacitor, and the other end of the voltage dividing module is connected with the positive electrode of the second capacitor;
The voltage dividing module is used for controlling the voltage of the first capacitor to be smaller than the forward voltage drop of the first light emitting module when the first control circuit does not work and the second control circuit works, and the difference value between the forward voltage drop of the first light emitting module and the voltage of the first capacitor is smaller than or equal to a first preset threshold value; and when the first control circuit works and the second control circuit does not work, controlling the voltage of the second capacitor to be smaller than the forward voltage drop of the second light emitting module, and enabling the difference value between the forward voltage drop of the second light emitting module and the voltage of the second capacitor to be smaller than or equal to a second preset threshold value.
2. The dimming control circuit of claim 1, wherein the voltage divider module comprises: a first voltage dividing element and a second voltage dividing element;
The negative electrode of the first voltage dividing element is connected with the positive electrode of the first capacitor, the positive electrode of the first voltage dividing element is connected with the positive electrode of the second voltage dividing element, and the negative electrode of the second voltage dividing element is connected with the positive electrode of the second capacitor;
Or alternatively
The positive pole of the first voltage dividing element is connected with the positive pole of the first capacitor, the negative pole of the first voltage dividing element is connected with the negative pole of the second voltage dividing element, and the positive pole of the second voltage dividing element is connected with the positive pole of the second capacitor.
3. The dimming control circuit of claim 2, wherein the first voltage dividing element comprises a first voltage regulator tube and the second voltage dividing element comprises a second voltage regulator tube.
4. A dimming control circuit as claimed in claim 2 or 3, further comprising: a current limiting module;
The current limiting module is connected with the voltage dividing module in series; the current limiting module is used for reducing the current value flowing through the voltage dividing module.
5. The dimming control circuit of claim 4, wherein the current limiting module is located between the first voltage dividing element and the second voltage dividing element.
6. The dimming control circuit of claim 4, wherein the current limiting module comprises a current limiting resistor.
7. The dimming control circuit of claim 6, wherein the current limiting resistor comprises an adjustable resistor.
8. The dimming control circuit of claim 1, wherein,
The first control circuit further includes: a first power input; the first power input end is connected with the positive electrode of the first capacitor; the negative electrode of the first capacitor is grounded;
the second control circuit further includes: a second power input; the second power input end is connected with the positive electrode of the second capacitor; the negative electrode of the second capacitor is grounded.
9. The dimming control circuit of claim 8, wherein,
The first control circuit further includes: a first driving chip; the first end of the first driving chip is connected with the first power input end, the second end of the first driving chip is connected with the negative electrode of the first capacitor, and the third end of the first driving chip is grounded; the second control circuit further includes: a second driving chip; the first end of the second driving chip is connected with the second power input end, the second end of the second driving chip is connected with the negative electrode of the second capacitor, and the third end of the second driving chip is grounded.
10. A color mixing LED lighting system, comprising: a first light emitting module, a second light emitting module, and a dimming control circuit as claimed in any one of claims 1-9.
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| CN202322525988.0U CN221043270U (en) | 2023-09-15 | 2023-09-15 | Color mixing LED lighting system and dimming control circuit thereof |
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| CN202322525988.0U CN221043270U (en) | 2023-09-15 | 2023-09-15 | Color mixing LED lighting system and dimming control circuit thereof |
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