CN211378319U - Light-emitting diode light mixing control circuit and system - Google Patents
Light-emitting diode light mixing control circuit and system Download PDFInfo
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- CN211378319U CN211378319U CN201921801744.8U CN201921801744U CN211378319U CN 211378319 U CN211378319 U CN 211378319U CN 201921801744 U CN201921801744 U CN 201921801744U CN 211378319 U CN211378319 U CN 211378319U
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Abstract
The utility model belongs to the technical field of photoelectric lighting, a emitting diode mixes light control circuit and system is provided. The light-emitting diode light mixing control circuit comprises: the device comprises a rectification filtering module, a dimming module and a color modulation module; the input end of the rectification filter module is connected with the mains supply, and the output end of the rectification filter module is respectively connected with the first input end of the dimming module and the first input end of the color modulation module; the second input end of the dimming module inputs a dimming signal, the second input end of the color mixing module inputs a color mixing signal, the first output end of the dimming module is connected with the high-voltage power supply end and the two current proportion adjusting ends of the color mixing module, and the second output end of the dimming module is connected with the high-voltage side floating end of the color mixing module. The utility model discloses in only having realized promptly mixing of colors to adjusting luminance of emitting diode LED mixed light control circuit with two current proportion regulation ends, the circuit is simple, and is with low costs.
Description
Technical Field
The utility model belongs to the technical field of photoelectric lighting, especially, relate to a light emitting diode mixes light control circuit and system.
Background
A Light Emitting Diode (LED) is a semiconductor device, and is widely used as an indicator lamp, a display LED panel, and the like, and as a white LED appears, the LED is also used as illumination. As a new generation of green light source, LEDs are favored as compared with conventional light sources such as incandescent lamps, fluorescent lamps, and high-intensity discharge lamps, and have many advantages such as energy saving, environmental friendliness, short response time, long lifetime, small size, and good shock resistance, and are a hot spot in research in the semiconductor lighting field of various countries.
With the continuous development of the LED industry, the color control requirement for the color-adjustable lamp product is higher and higher, the color point of the color mixture is required to fall on the planckian black body locus, and in order to achieve the requirement, a circuit control system with three outputs is required to achieve the requirement, so that the circuit is complex and the cost is high.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a light emitting diode light mixing control circuit and system to solve the problem that the control circuit for mixing color along the black body locus is complex and costly.
The embodiment of the utility model provides a first aspect provides a LED mixes light control circuit, include: the device comprises a rectification filtering module, a dimming module and a color modulation module;
the input end of the rectifying and filtering module is connected with a mains supply, and the output end of the rectifying and filtering module is respectively connected with the first input end of the dimming module and the first input end of the color modulation module;
the second input end of the dimming module inputs a dimming signal, the second input end of the color mixing module inputs a color mixing signal, the first output end of the dimming module is connected with the high-voltage power supply end of the color mixing module and the two current proportion adjusting ends, and the second output end of the dimming module is connected with the high-voltage side floating end of the color mixing module.
In one embodiment, the rectifying and filtering module comprises a fuse F1, a capacitor C1, a full-wave rectifying element BD1, an inductor L1, a resistor R1, a resistor R2, a resistor R3 and an noninductive capacitor CD 1;
one end of the fuse F1 is connected with a live wire of a commercial power, and the other end of the fuse F1 is respectively connected with one end of the capacitor C1 and a first input end of the full-wave rectifying element BD 1;
the other end of the capacitor C1 is connected with a second input end of the full-wave rectifying element BD 1; the second input end of the full-wave rectifying element BD1 is further connected with a zero line of a commercial power, the first output end of the full-wave rectifying element BD1 is connected with one end of a parallel circuit formed by the parallel connection of the inductor L1 and the resistor R1, and the second output end of the full-wave rectifying element BD1 is grounded;
the other end of a parallel circuit formed by the inductor L1 and the resistor R1 in parallel is respectively connected with one end of the resistor R2 and one end of the non-inductive capacitor CD 1;
one end of the resistor R2 is further connected with the first input end of the dimming module, and the other end of the resistor R2 is connected with the first input end of the dimming module after being connected with the resistor R3 in series;
the other end of the non-inductive capacitor CD1 is grounded.
In one embodiment, the dimming module includes a constant current driving unit and a voltage reduction unit;
a first input end of the constant current driving unit is connected with one end of the resistor R2, a second input end of the constant current driving unit inputs a dimming signal, and an output end of the constant current driving unit is connected with a first input end of the voltage reduction unit;
the second input end of the voltage reduction unit is connected with one end of the resistor R2, the first output end of the voltage reduction unit is respectively connected with the high-voltage power supply end of the color mixing module and the two current proportion adjusting ends, and the second output end of the voltage reduction unit is connected with the high-voltage side floating end of the color mixing module.
In one embodiment, the constant current driving unit comprises a constant current driving chip U1, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C2;
the open-circuit protection voltage regulating end of the constant current driving chip U1 is connected with a resistor R4 in series and then grounded;
the chip ground end of the constant current driving chip U1 is directly grounded;
the chip high-voltage power supply end of the constant current driving chip U1 is connected with one end of the resistor R2;
the drain end of an internal high-voltage power tube of the constant current driving chip U1 is connected with the first input end of the voltage reduction unit;
the dimming signal is input into a Pulse Width Modulation (PWM) dimming signal input end of the constant current driving chip U1 and is connected with one end of a parallel circuit formed by parallel connection of the capacitor C2 and the resistor R5, and the other end of the parallel circuit formed by parallel connection of the capacitor C2 and the resistor R5 is grounded;
the current sampling end of the constant current driving chip U1 is connected with one end of the resistor R6 and one end of the resistor R7, and the other end of the resistor R6 and the other end of the resistor R7 are grounded.
In one embodiment, the voltage dropping unit includes a light emitting diode D1, an inductor L2, a non-inductive capacitor CD2, and a resistor R8;
the anode of the light emitting diode D1 is connected to the drain end of the internal high-voltage power tube of the constant current driving chip U1 and one end of the inductor L2, and the cathode of the light emitting diode D1 is connected to one end of the resistor R2;
the other end of the inductor L2 is connected to one end of the non-inductive capacitor CD2 and one end of the resistor R8, respectively, and the other end of the inductor L2 is further connected to the high-voltage-side floating end of the color modulation module;
the other end of the non-inductive capacitor CD2 and the other end of the resistor R8 are connected with the cathode of the light emitting diode D1, and the other end of the non-inductive capacitor CD2 and the other end of the resistor R8 are also connected with the high-voltage power supply end and the two current proportion adjusting ends of the color adjusting module.
In one embodiment, the color modulation module comprises a warm color LED unit, at least two cold color LED units and a two-way PWM color modulation unit;
one end of the warm-color LED unit and one ends of the at least two cold-color LED units are both connected to the first output end of the voltage reduction unit, and the other end of the warm-color LED unit and the other ends of the at least two cold-color LED units are respectively connected to the first output end of the two-way PWM color mixing unit and the second output end of the two-way PWM color mixing unit;
the first input end of the double-path PWM color matching unit is connected with the resistor R3, the second input end of the double-path PWM color matching unit inputs the color matching signal, and the high-voltage power supply end and the high-voltage side floating end of the double-path PWM color matching unit are respectively connected with the output end of the voltage reduction unit.
In one embodiment, the warm-color LED unit comprises a set of warm-color LED strings, and the set of warm-color LED strings comprises at least two warm-color LEDs connected in series and having the same color temperature.
In one embodiment, the at least two cold color LED light emitting diode units include a resistor R9 and at least two sets of cold color LED light emitting diode strings with sequentially increasing color temperature, each set of cold color LED light emitting diode strings includes at least two cold color LEDs connected in series and having the same color temperature; the cold color LED light-emitting diode light string with the minimum color temperature in the at least two groups of cold color LED light-emitting diode light strings is connected in series with the resistor R9 and then is connected in parallel with other cold color LED light-emitting diode light strings with sequentially increased color temperature.
In one embodiment, the two-way PWM toning unit includes a two-way PWM toning chip U2, a resistor R10, a resistor R11, a resistor R12, a capacitor C3, a capacitor C4, and a capacitor C5;
the high-voltage side power supply end of the two-way PWM toning chip U2 is respectively connected with one end of the resistor R10 and one end of the capacitor C3, and the other end of the resistor R10 is connected with the first output end of the voltage reduction unit;
the high-voltage side floating end of the two-way PWM color matching chip U2 is connected with the other end of the capacitor C3, then is connected with the capacitor C4 in series and then is grounded, and the high-voltage side floating end of the two-way PWM color matching chip U2 is also connected with the second output end of the voltage reduction unit;
the drain end of a metal-oxide-semiconductor field effect transistor (MOSFET) 2 of the two-way PWM color modulation chip U2 is connected with the other end of the warm-color LED unit;
the drain end of a MOSFET1 of the two-way PWM color modulation chip U2 is connected with the other ends of the at least two cold-color LED units;
the PWM toning signal input end of the two-way PWM toning chip U2 is connected with one end of the resistor R11 and then inputs the toning signal, and the other end of the resistor R11 is connected with the resistor R12 in series and then grounded;
the low-voltage power supply end of the two-way PWM toning chip U2 is connected with the capacitor C5 and then grounded, and the low-voltage power supply end of the two-way PWM toning chip U2 is also connected with the resistor R3;
the chip ground terminal of the two-way PWM toning chip U2 is directly grounded.
The embodiment of the utility model provides a second aspect provides a light emitting diode mixes light control system, including above the light emitting diode of arbitrary mixes light control circuit.
In the embodiment of the utility model, the commercial power is rectified and filtered by the rectifying and filtering module to form a DC source required by the LED mixed light control circuit, the duty ratio of the output current of the dimming module is controlled by the dimming signal to control the total current entering the color modulation module, thereby realizing the dimming function of the color modulation module, and the current proportion of two current proportion regulating ends in the color modulation module is regulated by regulating the duty ratio of the color modulation signal, thereby realizing the color modulation function of the color modulation module. Better color tolerance management and control can be achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic block diagram of a light mixing control circuit of an led according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a light mixing control circuit of an led according to an embodiment of the present invention;
fig. 3 is a CIE chromaticity diagram provided by an embodiment of the present invention;
fig. 4 is a sectional color mixing trace diagram of a light emitting diode light mixing control circuit provided by an embodiment of the present invention;
fig. 5 is a graph showing current changes of a warm LED unit and at least two cool LED units according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Referring to fig. 1, the Light Emitting Diode (LED) mixing control circuit provided by the present invention is now described, the LED mixing control circuit includes: the device comprises a rectification filtering module 1, a dimming module 2 and a color modulation module 3;
the input end of the rectifying and filtering module 1 is connected to the mains supply and is used for converting the ac power into the dc power, and the output end of the rectifying and filtering module 1 is connected to the first input end of the dimming module 2 and the first input end of the color modulation module 3, respectively, so as to feed the dc power to the dimming module 2 and the color modulation module 3.
The second input end of the dimming module 2 inputs a dimming signal PWM1, the second input end of the color modulation module 3 inputs a color modulation signal PWM2, the first output end of the dimming module 2 is connected with the high-voltage power supply end of the color modulation module 3 and the two current proportion adjusting ends, and the second output end of the dimming module 2 is connected with the high-voltage side floating end of the color modulation module 3.
The dimming signal and the color Modulation signal are generally a dimming signal PWM1 and a color Modulation signal PWM2 generated by Pulse Width Modulation (PWM), and the external dimming signal PWM1 is input to the dimming module 2 to change the current duty ratio output by the dimming module 2 to adjust the effective value of the LED driving current, thereby implementing dimming.
For the color modulation module 3, the currents of the two current proportion adjustment ends can be controlled by an external color modulation signal PWM2, wherein the current of one current proportion adjustment end is the current flowing through one warm-color LED unit, the current of the other current proportion adjustment end is the current flowing through at least two cold-color LED units, and the brightness ratio of the one warm-color LED unit and the at least two cold-color LED units is controlled by adjusting the magnitude of the currents of the two current proportion adjustment ends, so as to adjust the color temperature of the LED module composed of the one warm-color LED unit and the at least two cold-color LED units.
The utility model discloses LED mixes light control circuit, through the luminance proportion of external mixing of colors signal PWM2 control warm look LED emitting diode unit and cold color LED emitting diode unit, can adjust the colour temperature of LED emitting diode module through two way output circuit promptly, make the colour mixture after adjusting remove along the black body orbit, realized the control to intermediate color temperature colour difference tolerance uniformity through simple circuit, the cost is reduced under the prerequisite that improves LED colour mixture control circuit's performance.
Optionally, referring to fig. 2, as an embodiment of the present invention, the rectification filter module 1 includes a fuse F1, a capacitor C1, a full-wave rectifier element BD1, an inductor L1, a resistor R1, a resistor R2, a resistor R3, and a non-inductive capacitor CD 1.
One end of the fuse F1 is connected to the live line L of the commercial power, and the other end of the fuse F1 is connected to one end of the capacitor C1 and the first input end of the full-wave rectifier BD1, respectively.
That is to say, the fuse F1 is connected between the full-wave rectifier element BD1 and the utility power, wherein the full-wave rectifier element BD1 is used to convert the utility power into direct current, in other embodiments of the present invention, the full-wave rectifier element may also adopt other suitable rectifier elements known in the art, and the embodiments of the present invention are not limited by this.
The other end of the capacitor C1 is connected to a second input end of the full-wave rectifier element BD 1; the second input end of the full-wave rectifying element BD1 is also connected with a zero line N of the commercial power, the first output end of the full-wave rectifying element BD1 is connected with one end of a parallel circuit formed by connecting an inductor L1 and a resistor R1 in parallel, and the second output end of the full-wave rectifying element BD1 is grounded.
The other end of a parallel circuit formed by connecting the inductor L1 and the resistor R1 in parallel is connected with one end of the resistor R2 and one end of the non-inductive capacitor CD1 respectively. One end of the resistor R2 is further connected to the first input end of the dimming module 2, and the other end of the resistor R2 is connected to the first input end of the dimming module 3 after being connected to the resistor R3 in series. The other end of the non-inductive capacitor CD1 is grounded.
The circuit composed of the inductor L1, the resistor R12 and the non-inductive capacitor CD1 is used for filtering the converted direct current.
Optionally, referring to fig. 2, as an embodiment of the present invention, the dimming module 2 includes a constant current driving unit 21 and a voltage reducing unit 22.
A first input terminal of the constant current driving unit 21 is connected to one terminal of the resistor R2, a second input terminal of the constant current driving unit 21 inputs the dimming signal PWM1, and an output terminal of the constant current driving unit 21 is connected to a first input terminal of the voltage dropping unit 22.
The second input end of the voltage-reducing unit 22 is connected with one end of the resistor R2, the first output end of the voltage-reducing unit 22 is connected with the high-voltage power supply end of the color-mixing module 3 and the two current proportion adjusting ends respectively, and the second output end of the voltage-reducing unit 22 is connected with the high-voltage side floating end of the color-mixing module 3.
The dimming signal PWM1 is input to the constant current driving unit 21 to control the magnitude of the output current of the constant current driving unit 21, and the voltage reduction unit 22 is combined to implement 1% -100% PWM dimming.
Optionally, referring to fig. 2, as an embodiment of the present invention, the constant current driving unit 21 includes a constant current driving chip U1, a resistor R4, a resistor R5, a resistor R6, a resistor R7, and a capacitor C2.
The open-circuit protection voltage regulating end of the constant current driving chip U1 is connected with the resistor R4 in series and then grounded, the chip ground end of U1 is directly grounded, and the chip high-voltage power supply end of U1 is connected with one end of the resistor R2.
The drain end of the internal high-voltage power tube of the constant current driving chip U1 is connected to the first input end of the voltage reduction unit 22, and the voltage reduction unit 22 and a field effect transistor (MOS) built in the constant current driving chip U1 form a Buck voltage reduction circuit, which plays a role of follow current.
The PWM dimming signal input terminal of the constant current driving chip U1 inputs the dimming signal PWM1, and is connected to one end of a parallel circuit formed by a capacitor C2 and a resistor R5 in parallel, and the other end of the parallel circuit formed by a capacitor C2 and a resistor R5 in parallel is grounded.
The capacitor C2 is used for filtering the dimming signal PWM1 and filtering noise, and the resistor R4 is a pull-down resistor of the dimming signal PWM1, so that the dimming signal PWM1 is suspended to be low voltage and avoid malfunction.
The current sampling end of the constant current driving chip U1 is connected with one end of a resistor R6 and one end of a resistor R7, and the other end of the resistor R6 and the other end of the resistor R7 are grounded.
The current sampling resistors R6 and R7 are current sampling resistors, the current sampling resistors are sampled at the current sampling end and then input into the current control circuit, and the current control circuit is compared with the internal reference voltage of the constant current driving chip U1, so that high-precision output constant current control can be realized.
Optionally, referring to fig. 2, as an embodiment of the present invention, the voltage dropping unit 22 includes a light emitting diode D1, an inductor L2, a non-inductive capacitor CD2, and a resistor R8.
The anode of the light emitting diode D1 is connected to the drain of the internal high voltage power tube of the constant current driving chip U1 and one end of the inductor L2, the cathode of the light emitting diode D1 is connected to one end of the resistor R2, the other end of the inductor L2 is connected to one end of the non-inductive capacitor CD2 and one end of the resistor R8, the other end of the inductor L2 is also connected to the high voltage side floating end of the color modulation module 3, the other end of the non-inductive capacitor CD2 and the other end of the resistor R8 are connected to the cathode of the light emitting diode D1, and the other end of the non-inductive capacitor CD2 and the other end of the resistor R8 are also connected to the high voltage power supply end and the two current ratio adjustment ends of.
The light emitting diode D1, the inductor L2 and an MOS tube arranged in the constant current driving chip U1 form a Buck circuit, the inductor L2 is used for storing energy, the non-inductive capacitor CD2 is used for outputting filtering, the resistor R8 is a dummy load and used for discharging current to the non-inductive capacitor CD2 during power failure.
Optionally, refer to fig. 2 to 4, as an embodiment of the present invention, the color mixing module 3 includes a warm color LED unit 31, at least two cold color LED units 32, and a two-way PWM color mixing unit 33.
One end of one warm-color LED unit 31 and one ends of at least two cold-color LED units 32 are both connected to the first output end of the voltage-reducing unit 22, and the other end of the warm-color LED unit 31 and the other ends of the at least two cold-color LED units 32 are respectively connected to the first output end of the two-way PWM color-mixing unit 33 and the second output end of the two-way PWM color-mixing unit 33.
The first input end of the two-way PWM color matching unit 33 is connected with the resistor R3, the second input end of the two-way PWM color matching unit 33 inputs a color matching signal PWM2, and the high-voltage power supply end and the high-voltage side floating end of the two-way PWM color matching unit 33 are respectively connected with the output end of the voltage reduction unit 22.
Referring to fig. 3, a planck black body locus exists in the CIE chromaticity diagram, and the color temperature of white light is along the black body locus, according to the color mixing principle, when any two colors are mixed, the color point of the mixed color is necessarily on the connecting line of the first two color points, i.e. the change of the color coordinate can only move along the connecting line of high and low color temperatures.
For example, the intermediate color temperature 3000K, 3500K, 4000K, 4500K, etc. may be obtained by mixing the low color temperature 2700K (which may correspond to the warm color LED unit) and the high color temperature 5000K (which may correspond to the cold color LED unit) according to a certain ratio, however, since the colors are not uniform, the mixed color points cannot be guaranteed to fall in the black body locus, and the color points after color mixing are allowed to move along the black body locus, which may be adjusted by adding one color (i.e., may be adjusted by adding one cold color LED unit), i.e., the color point locus of color changing may be changed, i.e., the color mixing may be realized by a segmented mixing manner to move along the black body locus, for example, referring to the segmented color mixing locus in fig. 4:
a first stage: 2700k → 3500k, by mixing 2700k with 3500k, the color point locus will move along the black body according to the mixing principle
And a second stage: 3500k → 5000k, with 3500k mixed with 5000k, the color point locus will move along the black body according to the mixing principle.
That is to say, by means of the sectional mixing, the color mixing signal PWM2 controls the currents of the first output terminal and the second output terminal of the two-way PWM color mixing unit of the color mixing module 3, respectively, so as to mix the warm color LED unit with the cold color LED unit having the smallest color temperature among the at least two cold color LED units, and then mix the two cold color LED units having the sequentially increased color temperatures among the cold color LED units, so as to move the color temperature of the mixed color along the black body locus.
Optionally, the way of obtaining the color temperature of the mixed color by means of segmentation mixing may be two segments, three segments or more, if the color mixing module 3 includes one warm-color LED unit and two cold-color LED units, the two segments are mixed, and if the color mixing module 3 includes one warm-color LED unit and three cold-color LED units, the three segments are mixed, the more segments are, the more the moving trajectory of the color temperature of the mixed color tends to the black body trajectory.
Optionally, referring to fig. 2, as an embodiment of the present invention, a warm color LED unit 31 includes a set of warm color LED strings, and the set of warm color LED strings includes at least two warm color LEDs connected in series and having the same color temperature.
Optionally, warm look LED emitting diode's colour temperature can be 2700K in the warm look LED emitting diode unit, also can be other warm look colour temperature values, the embodiment of the utility model provides a do not do the restriction to specific warm look colour temperature value.
Optionally, referring to fig. 2, as an embodiment of the present invention, the at least two cold color LED units 32 include a resistor R9 and at least two sets of cold color LED strings with sequentially increasing color temperature, where each set of cold color LED strings includes at least two cold color LEDs connected in series and having the same color temperature; the cold color LED light-emitting diode light string with the minimum color temperature in the at least two groups of cold color LED light-emitting diode light strings is connected in series with the resistor R9 and then is connected in parallel with other cold color LED light-emitting diode light strings with the sequentially increased color temperature.
The at least two cold color LED units 32 include at least two sets of cold color LED strings, and the color temperatures of the cold color LED strings in each set are different from each other, wherein the cold color LED string with the smallest color temperature is connected in series with a resistor R9 and then is connected in parallel with other cold color LED strings with sequentially increased color temperatures.
For example, the at least two sets of cold color LED light strings may be a cold color 1 light string and a cold color 2 light string, the color temperature of the cold color 1 light string may be 3500K, the color temperature of the cold color 2 light string may be 5000K, the cold color 1 light string is connected in series with a resistor R9 and then connected in parallel with the cold color 2 light string, the resistor may be packaged in a form of a patch or a plug-in, and the resistance value of R9 may be adjusted by calculating according to parameters.
The total forward working voltage VF1 of the cold color 1 light string is smaller than the total forward working voltage VF2 of the cold color 2 light string, and VF1 can be 2-10V lower than VF 2.
Optionally, referring to fig. 2, as an embodiment of the present invention, the two-way PWM toning unit 33 includes a two-way PWM toning chip U2, a resistor R10, a resistor R11, a resistor R12, a capacitor C3, a capacitor C4, and a capacitor C5.
The high-voltage side power supply end of the two-way PWM toning chip U2 is respectively connected with one end of a resistor R10 and one end of a capacitor C3, and the other end of the resistor R10 is connected with the first output end of the voltage reduction unit 22.
The resistor R10 provides a power supply resistor of a power supply loop for the high-voltage side power supply end of the two-way PWM color matching chip U2, and the capacitor C3 filters the high-voltage side power supply end of the two-way PWM color matching chip U2.
The high-voltage side floating end of the two-way PWM color-adjusting chip U2 is connected with the other end of the capacitor C3 and then is connected with the capacitor C4 in series and then is grounded, and the high-voltage side floating end of the two-way PWM color-adjusting chip U2 is also connected with the second output end of the voltage-reducing unit 22.
The capacitor C4 filters the ground of the chip for the high-voltage side floating ground end of the double-path PWM toning chip U2.
The drain terminal of a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) 2 of the two-way PWM toning chip U2 is connected with the other end of one warm-color LED unit 31, and the drain terminal of a MOSFET1 of the two-way PWM toning chip U2 is connected with the other ends of at least two cold-color LED units 32.
The current ratio of the MOS1 and the MOS2 in the dual-channel PWM toning chip U2, i.e. the ratio of I1 to (I2+ I3) in fig. 2, can be controlled by adjusting the duty ratio of the toning signal PWM2, and the dimming signal PWM1 in fig. 2 controls the current I output by the dimming module 2General assemblyI1+ (I2+ I3), and I1 ═ I3General assembly*PWM2。
Assuming that the color temperature of one set of Warm-color LED string lights LED1 is 2700K, at least two sets of cold-color LED string lights comprise a cold-color 1 string light LED3 and a cold-color 2 string light LED2, wherein the color temperature of the LED3 is 3500K, the color temperature of the LED2 is 5000K, and the LED3 is connected in series with a resistor R9 and then connected in parallel with the LED2 to form a Warm-grow circuit.
Referring to fig. 2 and 5, initially, the color-adjusting signal PWM2 controls only the LED1 to be turned on, and the color temperature is the initial color temperature 2700K. With the current adjusted, since the junction voltage of the LED3 is lower than that of the LED2, the current flows through the LED3 first, the LED3 is lit, the color temperature 3500K of the cold LED3 is mixed with the color temperature 2700K of the warm LED1, and the color point moves along the line connecting 2700K and 3500K according to the principle of color mixing. After a certain current value is reached, part of the current starts to be shunted and flows through the LED2 to meet VLED3+I3*R9＝VLED2As the current continues to increase, VF1 of LED3 exceeds LED2 by a large amount, and the current decreases, so that the color temperature is adjusted to 3500K and 5000K and moves along the black body locus to achieve the desired color.
The PWM toning signal input end of the double-path PWM toning chip U2 is connected with one end of a resistor R11 and then inputs a toning signal PWM2, and the other end of the resistor R11 is connected with a resistor R12 in series and then is grounded.
The resistor R11 is used for current-limiting protection of the toning signal PWM2, and the resistor R12 is a pull-down resistor of the toning signal PWM2, so that the toning signal PWM2 is at a low voltage when suspended, and misoperation is avoided.
The low-voltage power supply end of the double-path PWM color-mixing chip U2 is connected with the capacitor C5 and then grounded, the low-voltage power supply end of the double-path PWM color-mixing chip U2 is also connected with the resistor R3, and the chip ground end of the double-path PWM color-mixing chip U2 is directly grounded.
The capacitor C5 filters the low-voltage power supply end of the double-path PWM toning chip U2.
As another embodiment of the present invention, the present invention further includes a LED light mixing control system, which includes the LED light mixing control circuit of any one of the above embodiments, and the LED light mixing control circuit of any one of the above embodiments has the same advantageous effects.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A light mixing control circuit of a Light Emitting Diode (LED) is characterized by comprising: the device comprises a rectification filtering module, a dimming module and a color modulation module;
the input end of the rectifying and filtering module is connected with a mains supply, and the output end of the rectifying and filtering module is respectively connected with the first input end of the dimming module and the first input end of the color modulation module;
the second input end of the dimming module inputs a dimming signal, the second input end of the color mixing module inputs a color mixing signal, the first output end of the dimming module is connected with the high-voltage power supply end of the color mixing module and the two current proportion adjusting ends, and the second output end of the dimming module is connected with the high-voltage side floating end of the color mixing module.
2. The LED mixing control circuit of claim 1, wherein the rectifying and filtering module comprises a fuse F1, a capacitor C1, a full-wave rectifying element BD1, an inductor L1, a resistor R1, a resistor R2, a resistor R3 and a non-inductive capacitor CD 1;
one end of the fuse F1 is connected with a live wire of a commercial power, and the other end of the fuse F1 is respectively connected with one end of the capacitor C1 and a first input end of the full-wave rectifying element BD 1;
the other end of the capacitor C1 is connected with a second input end of the full-wave rectifying element BD 1; the second input end of the full-wave rectifying element BD1 is further connected with a zero line of a commercial power, the first output end of the full-wave rectifying element BD1 is connected with one end of a parallel circuit formed by the parallel connection of the inductor L1 and the resistor R1, and the second output end of the full-wave rectifying element BD1 is grounded;
the other end of a parallel circuit formed by the inductor L1 and the resistor R1 in parallel is respectively connected with one end of the resistor R2 and one end of the non-inductive capacitor CD 1;
one end of the resistor R2 is further connected with the first input end of the dimming module, and the other end of the resistor R2 is connected with the first input end of the dimming module after being connected with the resistor R3 in series;
the other end of the non-inductive capacitor CD1 is grounded.
3. The LED mixing control circuit according to claim 2, wherein the dimming module comprises a constant current driving unit and a voltage dropping unit;
a first input end of the constant current driving unit is connected with one end of the resistor R2, a second input end of the constant current driving unit inputs a dimming signal, and an output end of the constant current driving unit is connected with a first input end of the voltage reduction unit;
the second input end of the voltage reduction unit is connected with one end of the resistor R2, the first output end of the voltage reduction unit is respectively connected with the high-voltage power supply end of the color mixing module and the two current proportion adjusting ends, and the second output end of the voltage reduction unit is connected with the high-voltage side floating end of the color mixing module.
4. The LED light mixing control circuit of claim 3, wherein the constant current driving unit comprises a constant current driving chip U1, a resistor R4, a resistor R5, a resistor R6, a resistor R7 and a capacitor C2;
the open-circuit protection voltage regulating end of the constant current driving chip U1 is connected with a resistor R4 in series and then grounded;
the chip ground end of the constant current driving chip U1 is directly grounded;
the chip high-voltage power supply end of the constant current driving chip U1 is connected with one end of the resistor R2;
the drain end of an internal high-voltage power tube of the constant current driving chip U1 is connected with the first input end of the voltage reduction unit;
the dimming signal is input into a Pulse Width Modulation (PWM) dimming signal input end of the constant current driving chip U1 and is connected with one end of a parallel circuit formed by parallel connection of the capacitor C2 and the resistor R5, and the other end of the parallel circuit formed by parallel connection of the capacitor C2 and the resistor R5 is grounded;
the current sampling end of the constant current driving chip U1 is connected with one end of the resistor R6 and one end of the resistor R7, and the other end of the resistor R6 and the other end of the resistor R7 are grounded.
5. The LED light mixing control circuit of claim 4, wherein the voltage dropping unit comprises an LED D1, an inductor L2, a non-inductive capacitor CD2 and a resistor R8;
the anode of the light emitting diode D1 is connected to the drain end of the internal high-voltage power tube of the constant current driving chip U1 and one end of the inductor L2, and the cathode of the light emitting diode D1 is connected to one end of the resistor R2;
the other end of the inductor L2 is connected to one end of the non-inductive capacitor CD2 and one end of the resistor R8, respectively, and the other end of the inductor L2 is further connected to the high-voltage-side floating end of the color modulation module;
the other end of the non-inductive capacitor CD2 and the other end of the resistor R8 are connected with the cathode of the light emitting diode D1, and the other end of the non-inductive capacitor CD2 and the other end of the resistor R8 are also connected with the high-voltage power supply end and the two current proportion adjusting ends of the color adjusting module.
6. The LED mixing control circuit according to claim 3, wherein the color-adjusting module comprises a warm-color LED unit, at least two cool-color LED units and a two-way PWM color-adjusting unit;
one end of the warm-color LED unit and one ends of the at least two cold-color LED units are both connected to the first output end of the voltage reduction unit, and the other end of the warm-color LED unit and the other ends of the at least two cold-color LED units are respectively connected to the first output end of the two-way PWM color mixing unit and the second output end of the two-way PWM color mixing unit;
the first input end of the double-path PWM color matching unit is connected with the resistor R3, the second input end of the double-path PWM color matching unit inputs the color matching signal, and the high-voltage power supply end and the high-voltage side floating end of the double-path PWM color matching unit are respectively connected with the output end of the voltage reduction unit.
7. The LED light mixing control circuit of claim 6, wherein the warm-color LED unit comprises a set of warm-color LED strings, and the set of warm-color LED strings comprises at least two warm-color LEDs connected in series and having the same color temperature.
8. The LED mixing control circuit as claimed in claim 6, wherein the at least two cold color LED units comprise a resistor R9 and at least two sets of cold color LED strings with sequentially increasing color temperature, each set of cold color LED strings comprising at least two cold color LEDs connected in series and having the same color temperature; the cold color LED light-emitting diode light string with the minimum color temperature in the at least two groups of cold color LED light-emitting diode light strings is connected in series with the resistor R9 and then is connected in parallel with other cold color LED light-emitting diode light strings with sequentially increased color temperature.
9. The LED mixing control circuit according to any one of claims 6-8, wherein the two-way PWM color tuning unit comprises a two-way PWM color tuning chip U2, a resistor R10, a resistor R11, a resistor R12, a capacitor C3, a capacitor C4, and a capacitor C5;
the high-voltage side power supply end of the two-way PWM toning chip U2 is respectively connected with one end of the resistor R10 and one end of the capacitor C3, and the other end of the resistor R10 is connected with the first output end of the voltage reduction unit;
the high-voltage side floating end of the two-way PWM color matching chip U2 is connected with the other end of the capacitor C3, then is connected with the capacitor C4 in series and then is grounded, and the high-voltage side floating end of the two-way PWM color matching chip U2 is also connected with the second output end of the voltage reduction unit;
the drain end of a metal-oxide-semiconductor field effect transistor (MOSFET) 2 of the two-way PWM color modulation chip U2 is connected with the other end of the warm-color LED unit;
the drain end of a MOSFET1 of the two-way PWM color modulation chip U2 is connected with the other ends of the at least two cold-color LED units;
the PWM toning signal input end of the two-way PWM toning chip U2 is connected with one end of the resistor R11 and then inputs the toning signal, and the other end of the resistor R11 is connected with the resistor R12 in series and then grounded;
the low-voltage power supply end of the two-way PWM toning chip U2 is connected with the capacitor C5 and then grounded, and the low-voltage power supply end of the two-way PWM toning chip U2 is also connected with the resistor R3;
the chip ground terminal of the two-way PWM toning chip U2 is directly grounded.
10. A light-emitting diode light mixing control system, comprising the light-emitting diode light mixing control circuit as claimed in any one of claims 1 to 9.
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| CN201921801744.8U CN211378319U (en) | 2019-10-25 | 2019-10-25 | Light-emitting diode light mixing control circuit and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113597045A (en) * | 2021-07-02 | 2021-11-02 | 厦门天力源光电科技有限公司 | Light color control method of LED lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113597045A (en) * | 2021-07-02 | 2021-11-02 | 厦门天力源光电科技有限公司 | Light color control method of LED lamp |
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