CN116981124B - Dimming and color temperature adjusting circuit, PCB and lighting device - Google Patents
Dimming and color temperature adjusting circuit, PCB and lighting device Download PDFInfo
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- CN116981124B CN116981124B CN202311238719.4A CN202311238719A CN116981124B CN 116981124 B CN116981124 B CN 116981124B CN 202311238719 A CN202311238719 A CN 202311238719A CN 116981124 B CN116981124 B CN 116981124B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
Abstract
The invention relates to the technical field of LED (light-emitting diode) lighting circuits and discloses a dimming and color temperature adjusting circuit, a PCB (printed circuit board) and a lighting device, wherein the dimming and color temperature adjusting circuit comprises a first lighting unit, a second lighting unit, a first control unit, a second control unit, a constant current unit and a switch unit; the output end of the first control unit is respectively connected with the input end of the switch unit and the trigger end of the constant current unit; the feedback end of the constant current unit is connected with the switch unit; the output end of the switch unit is respectively connected with the first illumination unit and the second illumination unit to adjust the switch states of the two illumination units, so that dimming is realized; the output end of the second control unit is used for adjusting the working state of the first lighting unit so as to realize color temperature adjustment; the positive end and the negative end of the first lighting unit are respectively and correspondingly connected with the negative end and the positive end of the second lighting unit; the dimming and color temperature adjusting device can realize dimming and color temperature adjusting by adjusting the working states of the two lighting units, and has the advantage of high working flexibility.
Description
Technical Field
The invention relates to the technical field of LED lighting circuits, in particular to a dimming and color temperature adjusting circuit, a PCB and a lighting device.
Background
The two parameters of the brightness and the color temperature are main parameters of the lighting lamp, and the two parameters of the brightness and the color temperature are often regulated in the control of the LED lamp.
The existing lighting device generally only has the dimming function or only has the color temperature adjusting function, namely the existing lighting device does not have the dimming and color temperature adjusting function compatible in one product.
In addition, in the existing mode of controlling the sectional dimming or the color temperature adjustment through the dial switch, the current of the branch connected with the light emitting diode is generally adjusted directly through the dial switch, specifically, the resistance connection relation of the branch is adjusted, so that the sectional dimming or the color temperature adjustment of the light emitting diode is realized, the problem of unstable switching easily occurs in the switching process, the luminous effect of the LED lamp is influenced, and the use experience of a user is reduced.
It can be seen that there is a need for improvements and improvements in the art.
Disclosure of Invention
In view of the shortcomings of the prior art, the invention aims to provide a dimming and color temperature adjusting circuit which can realize dimming and color temperature adjusting and has the advantage of high working flexibility and improves the use experience of users.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a dimming and temperature adjusting circuit comprises a first lighting unit, a second lighting unit, a first control unit, a second control unit, a constant current unit and a switch unit; the input end of the first control unit is used for receiving the on-off electric signal, and the output end of the first control unit is respectively connected with the input end of the switch unit and the trigger end of the constant current unit; the feedback end of the constant current unit is connected with the switch unit; the output end of the switch unit is respectively connected with the first illumination unit and the second illumination unit and is used for adjusting the switch states of the first illumination unit and the second illumination unit so as to realize dimming; the input end of the second control unit is used for receiving a switch signal, and the output end of the second control unit is connected with the control end of the first illumination unit and used for adjusting the working state of the first illumination unit so as to realize color temperature adjustment; the positive end and the negative end of the first lighting unit are respectively and correspondingly connected with the negative end and the positive end of the second lighting unit.
In the dimming and color temperature adjusting circuit, the switch unit comprises a first switch part and a second switch part, the constant current unit is connected with the first switch part, the input end of the first switch part and the input end of the second switch part are respectively connected with the output end of the first control unit, the output end of the first switch part is respectively connected with the first illumination unit and the second illumination unit, and the output end of the second switch part is respectively connected with the first illumination unit and the second illumination unit.
In the dimming and color temperature adjusting circuit, the first switching part comprises a first switching tube Q1, a fourth switching tube Q4, a fifth switching tube Q5, a first resistor R1, a second resistor R2 and a second diode D2, wherein a base electrode of the fifth switching tube Q5 and a grid electrode of the fourth switching tube Q4 are respectively connected with the first control unit, a collector electrode of the fifth switching tube Q5 is connected with one end of the second resistor R2, one end of the first resistor R1 and a source electrode of the first switching tube Q1 are respectively connected with a feedback end of the constant current unit, the other end of the first resistor R1 is respectively connected with the other end of the second resistor R2 and a grid electrode of the first switching tube Q1, a drain electrode of the first switching tube Q1 is respectively connected with a positive electrode of the second diode D2, a negative electrode of the second diode D2 is respectively connected with a positive electrode of the first lighting unit and a negative electrode of the second lighting unit, a source electrode of the fourth switching tube Q4 is respectively connected with a positive electrode of the second lighting unit and a negative electrode of the fourth switching tube Q4 is respectively connected with a positive electrode of the fourth lighting unit and a negative electrode of the fourth switching unit; the second switching part comprises a second switching tube Q2, a third switching tube Q3, a sixth switching tube Q6, a third resistor R3, a fourth resistor R4 and a third diode D3, wherein the base electrode of the sixth switching tube Q6 and the grid electrode of the third switching tube Q3 are respectively connected with the first control unit, the collector electrode of the sixth switching tube Q6 is connected with one end of the fourth resistor R4, one end of the third resistor R3 and the source electrode of the second switching tube Q2 are respectively connected with the feedback end of the constant current unit, the other end of the third resistor R3 is respectively connected with the other end of the fourth resistor R4 and the grid electrode of the second switching tube Q2, the drain electrode of the second switching tube Q2 is respectively connected with the positive electrode of the third diode D3, the negative electrode of the third diode D3 is respectively connected with the negative end of the first lighting unit and the positive end of the second lighting unit, one end of the third switching tube Q3 is respectively connected with the positive electrode of the third switching tube Q3 and the negative electrode of the third switching tube Q3 is respectively connected with the positive electrode of the third lighting unit and the positive electrode of the third lighting unit.
In the dimming and color temperature adjusting circuit, the constant current unit comprises a constant current part and a feedback part, wherein the input end of the constant current part is used for receiving an on-off electric signal, the feedback end of the constant current part is connected with the output end of the feedback part, the trigger end of the feedback part is connected with the output end of the first control unit, and the feedback end of the feedback part is connected with the switch unit.
In the dimming and temperature-adjusting circuit, the constant current part comprises a first control chip U1, a first inductor L1 and a first diode D1, and the feedback part comprises a relay K1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a seventh switching tube Q7; one end of the first inductor L1 is used for receiving an on-off electrical signal, and the other end of the first inductor L1 is respectively connected with the pin 5 of the first control chip U1 and the anode of the first diode D1; the negative electrode of the first diode D1 is respectively connected with one end of a seventh resistor R7, a pin 7 of the first control chip U1 and a normally closed pin 6 of the relay K1; the other ends of the pin 8 and the seventh resistor R7 of the first control chip U1 and the eighth resistor R8 are respectively connected with the switch unit; one end of the eighth resistor R8 is connected with the normally closed pin 4 of the relay K1; the normally closed pin 3 of the relay K1 is connected with the normally closed pin 4, the inductance pin 5 of the relay K1 is connected with the collector of the seventh switching tube Q7 through the ninth resistor R9, the base of the seventh switching tube Q7 is connected with the output end of the first control unit, and the emitter of the seventh switching tube Q7 is grounded.
In the dimming and color temperature adjusting circuit, the first control unit comprises a voltage division part and a control part, the input end of the voltage division part is used for receiving an on-off electric signal, the output end of the voltage division part is connected with the input end of the control part, and the output end of the control part is respectively connected with the trigger end of the constant current unit and the input end of the switch unit.
In the dimming and temperature-adjusting circuit, the voltage division part comprises a fifth resistor R5, a sixth resistor R6, a zener diode ZD1 and a first capacitor C1, and the control part comprises a second control chip U2; one end of the fifth resistor R5 is configured to receive an on-off electrical signal, the other end of the fifth resistor R5 is respectively connected with the negative electrode of the zener diode ZD1, one end of the sixth resistor R6, one end of the first capacitor C1, and the pin 2 of the second control chip U2, the pin 6 and the pin 7 of the second control chip U2 are respectively connected with the switch unit, and the pin 7 of the second control chip U2 is also connected with the trigger end of the constant current unit; the positive electrode of the zener diode ZD1, the other end of the sixth resistor R6, and the other end of the first capacitor C1 are grounded respectively.
In the dimming and color temperature adjusting circuit, the second control unit comprises a toggle switch K2, a third control chip U3 and an adjusting part, the first lighting unit comprises a first lighting part and a second lighting part, the output end of the toggle switch K2 is connected with the adjusting part, the adjusting part is connected with a pin 6 of the third control chip U3, and the adjusting part is used for adjusting the voltage detected by the third control chip U3; the pin 5 of the third control chip U3 is connected with the first lighting portion, the pin 7 of the third control chip U3 is connected with the second lighting portion, and the third control chip U3 is used for adjusting the proportion of the current input to the first lighting portion and the second lighting portion.
The invention also correspondingly provides a PCB board, and the dimming and temperature-adjusting circuit is printed on the PCB board.
The invention also correspondingly provides a lighting device which comprises a shell, wherein the PCB is arranged in the shell.
The beneficial effects are as follows: the invention provides a dimming and color temperature adjusting circuit, which comprises a first control unit and a second control unit, wherein the first control unit can output a control signal to a switch unit according to an on-off electric signal, so that the on-off states of the first lighting unit and the second lighting unit are adjusted, namely the first lighting unit is controlled to work or the second lighting unit is controlled to work, and dimming is realized; the second control unit can output a control signal to the first lighting unit according to the switch signal so as to adjust the working state of the first lighting unit and realize color temperature adjustment; the first lighting unit and the second lighting unit can realize two functions of dimming and color temperature adjustment, have the advantage of high use flexibility, and improve the use experience of users.
Drawings
FIG. 1 is a circuit block diagram of a dimming and toning circuit provided by the invention;
fig. 2 is a circuit configuration diagram of a first lighting unit, a second lighting unit, a first control unit, a constant current unit and a switch unit provided by the present invention;
fig. 3 is a circuit configuration diagram of a second control unit provided by the present invention.
Description of main reference numerals: 1-first lighting unit, 11-first lighting part, 12-second lighting part, 2-second lighting unit, 3-first control unit, 31-voltage division part, 32-control part, 4-second control unit, 5-constant current unit, 51-constant current part, 52-feedback part, 6-switch unit, 61-first switch part, 62-second switch part.
Detailed Description
The invention provides a dimming and temperature-adjusting circuit, a PCB and a lighting device, and aims to make the purposes, the technical scheme and the effects of the invention clearer and more definite.
In the description of the present invention, it should be understood that the terms "mounted," "connected," and the like should be construed broadly, and that the specific meaning of the terms in the present invention may be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1 to 3, the present invention provides a dimming and temperature-adjusting circuit, which comprises a first lighting unit 1, a second lighting unit 2, a first control unit 3, a second control unit 4, a constant current unit 5 and a switch unit 6; the input end of the first control unit 3 is used for receiving on-off electrical signals, and the output end of the first control unit 3 is respectively connected with the input end of the switch unit 6 and the trigger end of the constant current unit 5; the feedback end of the constant current unit 5 is connected with the switch unit 6; the output end of the switch unit 6 is respectively connected with the first lighting unit 1 and the second lighting unit 2, and is used for adjusting the switch states of the first lighting unit 1 and the second lighting unit 2 so as to realize dimming; the input end of the second control unit 4 is used for receiving a switch signal, and the output end of the second control unit 4 is connected with the control end of the first lighting unit 1 and is used for adjusting the working state of the first lighting unit 1 so as to realize color temperature adjustment; the positive and negative ends of the first lighting unit 1 are respectively connected with the negative and positive ends of the second lighting unit 2.
The application discloses a dimming and color temperature adjusting circuit, which comprises a first control unit 3 and a second control unit 4, wherein the first control unit 3 can output a control signal to a switch unit 6 according to an on-off electric signal, so that the on-off states of a first lighting unit 1 and a second lighting unit 2 are adjusted, namely, the first lighting unit 1 or the second lighting unit 2 is controlled to work, and dimming is realized; the second control unit 4 can output a control signal to the first lighting unit 1 according to the switch signal so as to adjust the working state of the first lighting unit 1 and realize color temperature adjustment; the first lighting unit 1 and the second lighting unit 2 can realize two functions of dimming and color temperature adjustment, have the advantage of high use flexibility, and improve the use experience of users.
In this embodiment, the second lighting unit 2 includes a plurality of light emitting diodes LED-WM connected in series, and the illumination intensity of the second lighting unit 2 is lower than that of the first lighting unit 1, that is, the operation power of the second lighting unit 2 is lower than that of the first lighting unit 1.
Further, referring to fig. 1 and 2, the switch unit 6 includes a first switch portion 61 and a second switch portion 62, the constant current unit 5 is connected to the first switch portion 61, an input end of the first switch portion 61 and an input end of the second switch portion 62 are respectively connected to an output end of the first control unit 3, an output end of the first switch portion 61 is respectively connected to the first lighting unit 1 and the second lighting unit 2, and an output end of the second switch portion 62 is respectively connected to the first lighting unit 1 and the second lighting unit 2.
Further, referring to fig. 2, the first switching part 61 includes a first switching tube Q1, a fourth switching tube Q4, a fifth switching tube Q5, a first resistor R1, a second resistor R2, and a second diode D2, wherein a base electrode of the fifth switching tube Q5 and a gate electrode of the fourth switching tube Q4 are respectively connected to the first control unit 3, a collector electrode of the fifth switching tube Q5 is connected to one end of the second resistor R2, one end of the first resistor R1 and a source electrode of the first switching tube Q1 are respectively connected to a feedback end of the constant current unit 5, another end of the first resistor R1 is respectively connected to another end of the second resistor R2 and a gate electrode of the first switching tube Q1, a drain electrode of the first switching tube Q1 is respectively connected to a positive electrode of the second diode D2, a negative electrode of the second diode D2 is respectively connected to a positive electrode of the first lighting unit 1 and a negative electrode of the second lighting unit 2 and a positive electrode of the fourth switching tube Q4 is respectively connected to a negative electrode of the fourth switching tube Q2 and a positive electrode of the fourth switching tube Q2; the second switching part 62 includes a second switching tube Q2, a third switching tube Q3, a sixth switching tube Q6, a third resistor R3, a fourth resistor R4, and a third diode D3, a base electrode of the sixth switching tube Q6 and a gate electrode of the third switching tube Q3 are respectively connected to the first control unit 3, a collector electrode of the sixth switching tube Q6 is connected to one end of the fourth resistor R4, one end of the third resistor R3 and a source electrode of the second switching tube Q2 are respectively connected to a feedback end of the constant current unit 5, the other end of the third resistor R3 is respectively connected to the other end of the fourth resistor R4 and a gate electrode of the second switching tube Q2, a drain electrode of the second switching tube Q2 is connected to a positive electrode of the third diode D3, a negative electrode of the third diode D3 is respectively connected to a negative electrode of the first lighting unit 1 and a positive electrode of the second lighting unit 2, and a source electrode of the third switching tube Q3 is respectively connected to a positive electrode of the third lighting unit 1 and a negative electrode of the third switching tube Q3 is connected to the positive electrode of the second lighting unit 2 and a negative electrode of the third lighting unit 2.
Further, referring to fig. 1 and 2, the constant current unit 5 includes a constant current portion 51 and a feedback portion 52, an input end of the constant current portion 51 is configured to receive an on-off electrical signal, a feedback end of the constant current portion 51 is connected to an output end of the feedback portion 52, a trigger end of the feedback portion 52 is connected to an output end of the first control unit 3, and a feedback end of the feedback portion 52 is connected to the switch unit 6.
Further, referring to fig. 2, the constant current portion 51 includes a first control chip U1, a first inductor L1 and a first diode D1, and the feedback portion 52 includes a relay K1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a seventh switching tube Q7; one end of the first inductor L1 is used for receiving an on-off electrical signal, and the other end of the first inductor L1 is respectively connected with the pin 5 of the first control chip U1 and the anode of the first diode D1; the negative electrode of the first diode D1 is respectively connected with one end of a seventh resistor R7, a pin 7 of the first control chip U1 and a normally closed pin 6 of the relay K1; the other ends of the pin 8 and the seventh resistor R7 of the first control chip U1 and the eighth resistor R8 are respectively connected with the switch unit 6; one end of the eighth resistor R8 is connected with the normally closed pin 4 of the relay K1; the normally closed pin 3 of the relay K1 is connected with the normally closed pin 4, the inductance pin 5 of the relay K1 is connected with the collector of the seventh switching tube Q7 through the ninth resistor R9, the base of the seventh switching tube Q7 is connected with the output end of the first control unit 3, and the emitter of the seventh switching tube Q7 is grounded; in this embodiment, the model number of the first control chip U1 is MT7282.
In this embodiment, the inductance pin 2 of the relay K1 is connected with a power supply of the lighting device, and the power supply provides a voltage of 3.3V for the relay K1, so as to ensure that the relay K1 works normally.
Further, referring to fig. 1 and 2, the first control unit 3 includes a voltage division portion 31 and a control portion 32, wherein an input end of the voltage division portion 31 is configured to receive an on-off electrical signal, an output end of the voltage division portion 31 is connected to an input end of the control portion 32, and an output end of the control portion 32 is respectively connected to a trigger end of the constant current unit 5 and an input end of the switch unit 6.
Further, referring to fig. 1 and 2, the voltage dividing portion 31 includes a fifth resistor R5, a sixth resistor R6, a zener diode ZD1 and a first capacitor C1, and the control portion 32 includes a second control chip U2; one end of the fifth resistor R5 is configured to receive an on-off electrical signal, the other end of the fifth resistor R5 is respectively connected with the negative electrode of the zener diode ZD1, one end of the sixth resistor R6, one end of the first capacitor C1, and the pin 2 of the second control chip U2, the pin 6 and the pin 7 of the second control chip U2 are respectively connected with the switch unit 6, and the pin 7 of the second control chip U2 is also connected with the trigger end of the constant current unit 5; the anode of the voltage stabilizing diode ZD1, the other end of the sixth resistor R6 and the other end of the first capacitor C1 are respectively grounded; in this embodiment, the model of the second control chip U2 is an XY154 single-chip microcomputer.
Further, referring to fig. 1 to 3, the second control unit 4 includes a toggle switch K2, a third control chip U3, and an adjusting portion, the first lighting unit 1 includes a first lighting portion 11 and a second lighting portion 12, an output end of the toggle switch K2 is connected to the adjusting portion, the adjusting portion is connected to a pin 6 of the third control chip U3, and the adjusting portion is used for adjusting a voltage detected by the third control chip U3; the pin 5 of the third control chip U3 is connected to the first lighting unit 11, the pin 7 of the third control chip U3 is connected to the second lighting unit 12, and the third control chip U3 is configured to adjust the ratio of the currents input to the first lighting unit 11 and the second lighting unit 12; in this embodiment, the model of the third control chip U3 is an XY154 single-chip microcomputer.
In this embodiment, the adjusting portion includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15, one end of the tenth resistor R10 is used to connect to a 5V voltage, the 5V voltage is provided by a power supply of the lighting device, and the other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11, one end of the twelfth resistor R12, one end of the thirteenth resistor R13, one end of the fourteenth resistor R14, one end of the fifteenth resistor R15, and the pin 6 of the third control chip U3, respectively; the other end of the eleventh resistor R11 is connected with the pin 1 of the toggle switch K2, the other end of the twelfth resistor R12 is connected with the pin 2 of the toggle switch K2, the other end of the thirteenth resistor R13 is connected with the pin 4 of the toggle switch K2, the other end of the fourteenth resistor R14 is connected with the pin 5 of the toggle switch K2, the other end of the fifteenth resistor R15 is connected with the pin 6 of the toggle switch K2, and the pin 3 of the toggle switch K2 is grounded.
In this embodiment, the first lighting part 11 includes a first lighting group and an eighth switching tube Q8, the first lighting group includes a plurality of light emitting diodes LEDs-C connected in series, the positive end of the first lighting group is connected to the negative electrode of the second diode D2 and the drain electrode of the third switching tube Q3, the negative end of the first lighting group is connected to the drain electrode of the eighth switching tube Q8, and the gate electrode of the eighth switching tube Q8 is connected to the pin 5 of the third control chip U3; the second lighting part 12 comprises a second lighting group and a ninth switching tube Q9, the second lighting group comprises a plurality of light emitting diodes LED-W which are connected in series, the positive end of the second lighting group is respectively connected with the negative electrode of the second diode D2 and the drain electrode of the third switching tube Q3, the negative end of the second lighting group is connected with the drain electrode of the ninth switching tube Q9, and the grid electrode of the ninth switching tube Q9 is connected with the pin 7 of the third control chip U3; the source of the eighth switching tube Q8 and the source of the ninth switching tube Q9 are respectively connected with the drain of the fourth switching tube Q4.
In the dimming and temperature-adjusting circuit disclosed by the application, during actual work, the second control chip U2 detects the power-on and power-off states of an external on-off electric signal VIN through two voltage dividing resistors of the voltage dividing part 31, namely a fifth resistor R5 and a sixth resistor R6, and outputs two high-level signals which are PWM1 and PWM2 respectively in turn according to the on-off states; when VIN is powered on for the first time, a PWM1 high-level signal is output, and when VIN is powered off for more than or equal to 1 second, a PWM2 high-level signal is output after the VIN is powered on again; when dimming is needed, switching of high-level signals is realized by adjusting on-off electrical signals, so that the working states of the first lighting unit and the second lighting unit are adjusted, and dimming is realized; when the color temperature is required to be regulated, the switching of the on-off electric signal is not performed, and the second control chip U2 keeps outputting the high level of the PWM 1; the toggle switch K2 is a five-gear toggle switch, the toggle switch K2 can realize that the pin 1, the pin 2, the pin 4, the pin 5 and the pin 6 are respectively conducted with the pin 3, so that the tenth resistor R10 is respectively connected with the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14 and the fifteenth resistor R15 to obtain 5 different detection voltages VF, the pin 6 of the third control chip U3 correspondingly outputs 5 PWM signals with different combinations by detecting the 5 different detection voltages VF, the PWM signals include PWM3 signals output by the pin 5 of the third control chip U3 and PWM4 signals output by the pin 7 of the third control chip U3, so that the constant current of the first lighting unit 1 is divided into 5 different conditions, that is, the input currents of the first lighting unit 11 and the second lighting unit 12 have 5 different conditions, and thus 5 different color temperatures are adjusted.
The PWM3 and the PWM4 output by the third control chip U3 are square waves with the frequency of 1KHZ, the duty ratio is 0-100%, the specific value is based on the actual test color temperature, and the sum of the duty ratios of the PWM3 and the PWM4 is required to be 100% when the LED display device works actually; the color temperature of the LED lamp is generally 2700K-7000K, the color temperature of about 3000K is generally called warm white, and the color temperature of about 6000K is cold white; in practical application, the color temperature can be divided into 5 different grades according to the use requirement of a customer, and supposing that a first lighting part 11 (namely an LED-C) in the figure is a path of LED lamp beads with the color temperature of 6000K, a second lighting part 12 (namely an LED-W) is a path of lamp beads with the color temperature of 3000K, two groups of lamps are mixed together according to different power ratios, so that any color temperature of 3000K-6000K can be realized theoretically; regarding the two lamps of the first lighting part 11LED-C and the second lighting part 12LED-W as a group, namely, the first lighting unit 1, since the dimming and color temperature adjusting circuit comprises the constant current unit 5, namely, the constant current source, the current flowing through the first lighting unit 1 is constant, and the input current of the first lighting unit 1 can be divided into different combinations by adjusting the duty ratio of the PWM3 signal and the PWM4 signal, thereby realizing different power combinations of the first lighting part 11 and the second lighting part 12, and further realizing color mixing to obtain the color temperature required by a customer.
Illustrating: setting an LED lamp bead with 6000K color temperature of the LED-C of the first illumination part 11 and a lamp bead with 3000K color temperature of the LED-W of the second illumination part 12;
when PWM 3=0 and pwm4=100%, the first lighting unit 11LED-C is not on, only the second lighting unit 12LED-W is on, and the color temperature of the first lighting unit 1 is 3000K;
when PWM 3=50% and PWM 4=50%, the first lighting section 11LED-C and the second lighting section 12LED-W are half-current, and the color temperature of the first lighting unit 1 is 4500K;
when PWM 3=100% and PWM 4=0%, the first lighting unit 11LED-C is on, the second lighting unit 12LED-W is off, and the color temperature of the first lighting unit 1 is 6000K.
In this embodiment, after the adjustment signal fed back by the toggle switch K2 is input to the third control chip U3 for processing, the third control chip U3 outputs the PWM signal to adjust the working states of the whole first lighting portion 11 and the second lighting portion 12, so that the stability during switching can be improved, and the adjustment precision can be improved, so that the stability during operation of the dimming and color temperature adjusting circuit is improved, and the lighting effect of the lighting device is improved to improve the use experience of the user.
The first control chip U1 is a constant current chip, and a seventh resistor R7 and an eighth resistor R8 included in the feedback part 52 are used for current sampling; the relay K1 is in a long-closed state, namely a pin 6, a pin 3 and a pin 4 of the relay K1 are in a closed state, when the high-level PWM1 is output, the first switching tube Q1, the fourth switching tube Q4 and the fifth switching tube Q5 are conducted, the first lighting unit 1 normally works, the second lighting unit 2 does not work, meanwhile, the seventh resistor R7 and the eighth resistor R8 normally work, the sampling current fed back to the first control chip U1 by the feedback part 52 is large, and the dimming and color temperature adjusting circuit is in a main illumination working mode; when the high-level PWM2 is output, the second switching tube Q2, the third switching tube Q3 and the sixth switching tube Q6 are conducted, the second lighting unit 2 is in normal work, the first lighting unit 1 is not in work, meanwhile, the relay K1 acts, the pins 6, 3 and 4 of the relay K1 are in a disconnected state, the eighth resistor R8 is in an open circuit, sampling is conducted through the seventh resistor R7, sampling current fed back to the first control chip U1 is small, and the dimming and toning temperature circuit is in a small night lamp working mode; therefore, when the switch is switched, the conversion between the main illumination mode and the small night lamp mode is realized, namely, the dimming is realized.
The invention also correspondingly provides a PCB board, and the dimming and temperature-adjusting circuit is printed on the PCB board.
The invention also correspondingly provides a lighting device which comprises a shell, wherein the PCB is arranged in the shell.
It will be understood that equivalents and modifications will occur to those skilled in the art based on the present invention and its spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention.
Claims (8)
1. The dimming and temperature adjusting circuit is characterized by comprising a first lighting unit, a second lighting unit, a first control unit, a second control unit, a constant current unit and a switch unit; the input end of the first control unit is used for receiving the on-off electric signal, and the output end of the first control unit is respectively connected with the input end of the switch unit and the trigger end of the constant current unit; the feedback end of the constant current unit is connected with the switch unit; the output end of the switch unit is respectively connected with the first illumination unit and the second illumination unit and is used for adjusting the switch states of the first illumination unit and the second illumination unit so as to realize dimming; the input end of the second control unit is used for receiving a switch signal, and the output end of the second control unit is connected with the control end of the first illumination unit and used for adjusting the working state of the first illumination unit so as to realize color temperature adjustment; the positive end and the negative end of the first lighting unit are respectively and correspondingly connected with the negative end and the positive end of the second lighting unit;
the switch unit comprises a first switch part and a second switch part, the constant current unit is connected with the first switch part, the input end of the first switch part and the input end of the second switch part are respectively connected with the output end of the first control unit, the output end of the first switch part is respectively connected with the first illumination unit and the second illumination unit, and the output end of the second switch part is respectively connected with the first illumination unit and the second illumination unit;
the first switching part comprises a first switching tube Q1, a fourth switching tube Q4, a fifth switching tube Q5, a first resistor R1, a second resistor R2 and a second diode D2, wherein the base electrode of the fifth switching tube Q5 and the grid electrode of the fourth switching tube Q4 are respectively connected with the first control unit, the collector electrode of the fifth switching tube Q5 is connected with one end of the second resistor R2, one end of the first resistor R1 and the source electrode of the first switching tube Q1 are respectively connected with the feedback end of the constant current unit, the other end of the first resistor R1 is respectively connected with the other end of the second resistor R2 and the grid electrode of the first switching tube Q1, the drain electrode of the first switching tube Q1 is respectively connected with the positive electrode of the second diode D2, the negative electrode of the second diode D2 is respectively connected with the positive end of the first lighting unit and the negative end of the second lighting unit, the fourth switching tube Q4 is respectively connected with the positive electrode of the fourth switching tube Q4 and the negative electrode of the fourth switching tube Q4 is respectively connected with the positive electrode of the fourth lighting unit and the positive electrode of the fourth switching tube Q4; the second switching part comprises a second switching tube Q2, a third switching tube Q3, a sixth switching tube Q6, a third resistor R3, a fourth resistor R4 and a third diode D3, wherein the base electrode of the sixth switching tube Q6 and the grid electrode of the third switching tube Q3 are respectively connected with the first control unit, the collector electrode of the sixth switching tube Q6 is connected with one end of the fourth resistor R4, one end of the third resistor R3 and the source electrode of the second switching tube Q2 are respectively connected with the feedback end of the constant current unit, the other end of the third resistor R3 is respectively connected with the other end of the fourth resistor R4 and the grid electrode of the second switching tube Q2, the drain electrode of the second switching tube Q2 is respectively connected with the positive electrode of the third diode D3, the negative electrode of the third diode D3 is respectively connected with the negative end of the first lighting unit and the positive end of the second lighting unit, one end of the third switching tube Q3 is respectively connected with the positive electrode of the third switching tube Q3 and the negative electrode of the third switching tube Q3 is respectively connected with the positive electrode of the third lighting unit and the positive electrode of the third lighting unit.
2. The dimming and color temperature adjusting circuit according to claim 1, wherein the constant current unit comprises a constant current part and a feedback part, the input end of the constant current part is used for receiving an on-off electric signal, the feedback end of the constant current part is connected with the output end of the feedback part, the trigger end of the feedback part is connected with the output end of the first control unit, and the feedback end of the feedback part is connected with the switch unit.
3. The dimming and temperature adjusting circuit according to claim 2, wherein the constant current part comprises a first control chip U1, a first inductor L1 and a first diode D1, and the feedback part comprises a relay K1, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a seventh switching tube Q7; one end of the first inductor L1 is used for receiving an on-off electrical signal, and the other end of the first inductor L1 is respectively connected with the pin 5 of the first control chip U1 and the anode of the first diode D1; the negative electrode of the first diode D1 is respectively connected with one end of a seventh resistor R7, a pin 7 of the first control chip U1 and a normally closed pin 6 of the relay K1; the other ends of the pin 8 and the seventh resistor R7 of the first control chip U1 and the eighth resistor R8 are respectively connected with the switch unit; one end of the eighth resistor R8 is connected with the normally closed pin 4 of the relay K1; the normally closed pin 3 of the relay K1 is connected with the normally closed pin 4, the inductance pin 5 of the relay K1 is connected with the collector of the seventh switching tube Q7 through the ninth resistor R9, the base of the seventh switching tube Q7 is connected with the output end of the first control unit, and the emitter of the seventh switching tube Q7 is grounded; the model of the first control chip U1 is MT7282.
4. The dimming and temperature-adjusting circuit according to claim 1, wherein the first control unit comprises a voltage division part and a control part, the input end of the voltage division part is used for receiving an on-off electric signal, the output end of the voltage division part is connected with the input end of the control part, and the output end of the control part is respectively connected with the trigger end of the constant current unit and the input end of the switch unit.
5. The dimming and temperature adjusting circuit as claimed in claim 4, wherein the voltage dividing part comprises a fifth resistor R5, a sixth resistor R6, a zener diode ZD1 and a first capacitor C1, and the control part comprises a second control chip U2; one end of the fifth resistor R5 is configured to receive an on-off electrical signal, the other end of the fifth resistor R5 is respectively connected with the negative electrode of the zener diode ZD1, one end of the sixth resistor R6, one end of the first capacitor C1, and the pin 2 of the second control chip U2, the pin 6 and the pin 7 of the second control chip U2 are respectively connected with the switch unit, and the pin 7 of the second control chip U2 is also connected with the trigger end of the constant current unit; the anode of the voltage stabilizing diode ZD1, the other end of the sixth resistor R6 and the other end of the first capacitor C1 are respectively grounded; the model of the second control chip U2 is an XY154 singlechip.
6. The dimming and temperature-adjusting circuit according to claim 1, wherein the second control unit comprises a toggle switch K2, a third control chip U3 and an adjusting part, the first lighting unit comprises a first lighting part and a second lighting part, the output end of the toggle switch K2 is connected with the adjusting part, the adjusting part is connected with a pin 6 of the third control chip U3, and the adjusting part is used for adjusting the voltage detected by the third control chip U3; the pin 5 of the third control chip U3 is connected with the first lighting part, the pin 7 of the third control chip U3 is connected with the second lighting part, and the third control chip U3 is used for adjusting the proportion of the current input to the first lighting part and the second lighting part; the model of the third control chip U3 is an XY154 singlechip.
7. A PCB board, wherein the dimming and toning circuit according to any one of claims 1-6 is printed on the PCB board.
8. A lighting device comprising a housing, wherein the PCB of claim 7 is disposed within the housing.
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| CN202311238719.4A CN116981124B (en) | 2023-09-25 | 2023-09-25 | Dimming and color temperature adjusting circuit, PCB and lighting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311238719.4A CN116981124B (en) | 2023-09-25 | 2023-09-25 | Dimming and color temperature adjusting circuit, PCB and lighting device |
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| CN116981124A CN116981124A (en) | 2023-10-31 |
| CN116981124B true CN116981124B (en) | 2023-12-26 |
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| CN219421100U (en) * | 2022-12-19 | 2023-07-25 | 宁波凯耀电器制造有限公司 | Multifunctional lamp circuit |
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| CN107846755A (en) * | 2017-11-20 | 2018-03-27 | 李舒 | A kind of circuit and its control method of remote control LED degree of lightening color-temperature regulatings |
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|---|---|
| CN116981124A (en) | 2023-10-31 |
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