CN211909244U - LED drive circuit with variable color temperature - Google Patents
LED drive circuit with variable color temperature Download PDFInfo
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- CN211909244U CN211909244U CN202020819034.4U CN202020819034U CN211909244U CN 211909244 U CN211909244 U CN 211909244U CN 202020819034 U CN202020819034 U CN 202020819034U CN 211909244 U CN211909244 U CN 211909244U
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Abstract
The utility model provides a LED drive circuit of variable colour temperature, include: the LED light-emitting module comprises a voltage stabilizing circuit, a master control MCU and two LED light-emitting modules; the base electrode of a switch tube in each path of LED light-emitting module is connected with the I/O port in the MCU in a one-to-one correspondence manner, the emitting electrode is grounded, and the collector electrode is connected with the cathode of the LED light-emitting chip connected in series; the main control chip MCU is provided with N sections of PWM1 output by I/O ports: duty ratio of the PWM2 signal; the ADC IN port of the main control chip MCU is connected to a VCC power supply through a resistor R6, and is grounded through a variable resistor R1, and the voltage of the ADC IN port is changed by changing the resistance value of R1, so that the duty ratio of PWM1 and PWM2 signals output by the main control chip MCU is changed accordingly. The LED drive circuit with the variable color temperature can adjust various color temperatures as long as two lamp beads are used.
Description
Technical Field
The utility model relates to a lighting device especially relates to LED drive circuit.
Background
The existing LED is simple monochromatic lighting or simple monochromatic adjustment is realized through multiple color temperature lamp beads, backlog of inventory can be caused even cannot be sold, the whole cost can be increased due to the fact that multiple lamp beads are used for color mixing, and the cost performance does not influence the sales performance.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the main technical problem that a LED drive circuit of variable colour temperature is provided, as long as two kinds of lamp pearls just can the regulation of multiple colour temperature.
In order to solve the technical problem, the utility model provides a LED drive circuit of variable colour temperature, include: the LED light-emitting module comprises a voltage stabilizing circuit, a master control MCU and two LED light-emitting modules; each path of LED light-emitting module respectively comprises a switch tube and LED light-emitting chips connected in series; the color temperatures of the LED light-emitting chips in the LED light-emitting modules in different paths are different;
the base electrode of a switch tube in each path of LED light-emitting module is connected with the I/O port in the MCU in a one-to-one correspondence manner, the emitting electrode is grounded, and the collector electrode is connected with the cathode of the LED light-emitting chip connected in series;
the main control chip MCU is provided with N sections of PWM1 output by I/O ports: duty ratio of the PWM2 signal; the ADC IN port of the main control chip MCU is connected to a VCC power supply through a resistor R6, and is grounded through a variable resistor R1, the voltage of the ADC IN port is changed by changing the resistance of R1, so that the ADC IN port is also divided into 4V/N sections, and N sections of PWM 1: the duty ratio of the PWM2 signals corresponds to one; when the voltage input by the ADC IN port changes, the duty ratio of the PWM1 and PWM2 signals output by the main control chip MCU changes accordingly.
In a preferred embodiment: the number N is 256.
In a preferred embodiment: the PWM 1: the duty ratio of the PWM2 signals is 0.0039:0.9961, 0.0078:0.9922 … … 0.9922:0.0078 and 0.9961: 0.0039.
In a preferred embodiment: the voltage stabilizing circuit comprises a voltage regulator tube Z1, a triode Q3 and a current limiting resistor R9; a collector of the triode Q3 is connected with a VCC power supply, an emitter is connected to the anode of the LED light-emitting chip connected in series through a current-limiting resistor R9, and a base is connected to the cathode of a voltage regulator tube Z1; the anode of the regulator tube Z1 is connected to the VCC power supply through a capacitor C1.
Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:
the utility model provides a LED drive circuit of variable colour temperature, through the resistance that changes variable resistance R1, can change PWM1, the PWM2 signal of the different duty cycle of MCU output to change the drive current of two way lamp pearls, just so can change the luminance of two way LED lamp pearls, the light-emitting colour temperature after final colour mixture just also changes thereupon. The first path of LED chip can use 2000K lamp beads, the second path of LED chip uses 6500K lamp beads, the output color temperature can be any color temperature between 2000K and 6500K, and the color temperature requirements of all customers on the market are met.
Drawings
Fig. 1 is a circuit diagram in a preferred embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, a variable color temperature LED driving circuit includes: the LED light-emitting module comprises a voltage stabilizing circuit, a master control MCU and two LED light-emitting modules; each path of LED light-emitting module respectively comprises a switch tube and LED light-emitting chips connected in series; the color temperatures of the LED light-emitting chips in the LED light-emitting modules in different paths are different;
the base electrode of a switch tube in each path of LED light-emitting module is connected with the I/O port in the MCU in a one-to-one correspondence manner, the emitting electrode is grounded, and the collector electrode is connected with the cathode of the LED light-emitting chip connected in series;
the main control chip MCU is provided with N sections of PWM1 output by I/O ports: duty ratio of the PWM2 signal; the ADC IN port of the main control chip MCU is connected to a VCC power supply through a resistor R6, and is grounded through a variable resistor R1, the voltage of the ADC IN port is changed by changing the resistance of R1, so that the ADC IN port is also divided into 4V/N sections, and N sections of PWM 1: the duty ratio of the PWM2 signals corresponds to one; when the voltage input by the ADC IN port changes, the duty ratio of the PWM1 and PWM2 signals output by the main control chip MCU changes accordingly.
The voltage stabilizing circuit comprises a voltage regulator tube Z1, a triode Q3 and a current limiting resistor R9; a collector of the triode Q3 is connected with a VCC power supply, an emitter is connected to the anode of the LED light-emitting chip connected in series through a current-limiting resistor R9, and a base is connected to the cathode of a voltage regulator tube Z1; the anode of the regulator tube Z1 is connected to the VCC power supply through a capacitor C1.
The combination for supplying power to the MCU is arranged in a black frame in the figure 1, the resistor R9 is a current-limiting resistor, the triode Q3 is prevented from being damaged by large current, the Z1 is a voltage regulator tube, when the triode Q3 is conducted, the voltage at two ends of the capacitor C1 is lower than the voltage of the voltage regulator tube Z1, the triode Q3 can be kept in a conducting state, when the voltage at two ends of the capacitor C1 is higher than the voltage of the voltage regulator tube Z1, the voltage regulator tube Z1 is conducted, the current is grounded through the voltage regulator tube Z1, the triode Q3 is turned off, and the voltage on the VCC power supply is clamped to the voltage equivalent to the voltage regulator tube Z1, so that a voltage regulator circuit is formed, the MCU.
Setting an I/O port PWM1 output by the MCU of the main control chip: the PWM2 duty ratio is 0.0039:0.9961, 0.0078:0.9922 … … 0.9922:0.00780, 9961:0.0039, 256 sections can be set IN the middle, because the input capability of I/O is 8 powers of 2, then the voltage of an ADC IN port of the corresponding main control chip MCU can be set, a reference voltage is 4V IN the main control chip MCU, the voltage of the ADC IN port is set to be 4V/256 sections, and the voltage of each section corresponds to one PWM 1: the duty cycle of the PWM2 signal. Then, through the voltage division of the additional resistors R6 and R1, the resistance of the R6 resistor is fixed, the resistance of the R1 resistor is adjustable, and according to the formula R1/(R1+ R6) × VCC, the voltage on the ADC IN can be changed by changing the resistance of the R1 resistor, so that different PWM1 can be output: the duty ratio of PWM2, the different duty ratios control the on-off time of Q1 and Q2 triode respectively to change the drive current of two ways of LED1, LED2, LED1 bit low color temperature lamp pearl, LED2 bit high color temperature lamp pearl, different drive current, two way luminance can change, the colour temperature that mixes like this also can change along with the change of electric current.
The above embodiments are merely illustrative, and not restrictive, of the present invention. Changes, modifications, etc. to the above-described embodiments are intended to fall within the scope of the claims of the present invention, as long as they are in accordance with the technical spirit of the present invention.
Claims (4)
1. A variable color temperature LED driver circuit, comprising: the LED light-emitting module comprises a voltage stabilizing circuit, a master control MCU and two LED light-emitting modules; each path of LED light-emitting module respectively comprises a switch tube and LED light-emitting chips connected in series; the color temperatures of the LED light-emitting chips in the LED light-emitting modules in different paths are different;
the base electrode of a switch tube in each path of LED light-emitting module is connected with the I/O port in the MCU in a one-to-one correspondence manner, the emitting electrode is grounded, and the collector electrode is connected with the cathode of the LED light-emitting chip connected in series;
the main control chip MCU is provided with N sections of PWM1 output by I/O ports: duty ratio of the PWM2 signal; the ADC IN port of the main control chip MCU is connected to a VCC power supply through a resistor R6, and is grounded through a variable resistor R1, the voltage of the ADC IN port is changed by changing the resistance of R1, so that the ADC IN port is also divided into 4V/N sections, and N sections of PWM 1: the duty ratio of the PWM2 signals corresponds to one; when the voltage input by the ADC IN port changes, the duty ratio of the PWM1 and PWM2 signals output by the main control chip MCU changes accordingly.
2. The LED driving circuit with variable color temperature according to claim 1, wherein: the number N is 256.
3. The LED driving circuit with variable color temperature according to claim 1, wherein: the PWM 1: the duty ratio of the PWM2 signals is 0.0039:0.9961, 0.0078:0.9922 … … 0.9922:0.0078 and 0.9961: 0.0039.
4. The LED driving circuit with variable color temperature according to claim 1, wherein: the voltage stabilizing circuit comprises a voltage regulator tube Z1, a triode Q3 and a current limiting resistor R9; a collector of the triode Q3 is connected with a VCC power supply, an emitter is connected to the anode of the LED light-emitting chip connected in series through a current-limiting resistor R9, and a base is connected to the cathode of a voltage regulator tube Z1; the anode of the regulator tube Z1 is connected to the VCC power supply through a capacitor C1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020819034.4U CN211909244U (en) | 2020-05-15 | 2020-05-15 | LED drive circuit with variable color temperature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020819034.4U CN211909244U (en) | 2020-05-15 | 2020-05-15 | LED drive circuit with variable color temperature |
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| CN211909244U true CN211909244U (en) | 2020-11-10 |
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| CN202020819034.4U Active CN211909244U (en) | 2020-05-15 | 2020-05-15 | LED drive circuit with variable color temperature |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112672479A (en) * | 2020-12-28 | 2021-04-16 | 深圳市裕富照明有限公司 | Lighting control device for vehicle headlight |
| CN113905478A (en) * | 2021-10-21 | 2022-01-07 | 深圳市乐的美光电股份有限公司 | Lamp strip with brightness and color temperature correspondingly adjusted |
-
2020
- 2020-05-15 CN CN202020819034.4U patent/CN211909244U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112672479A (en) * | 2020-12-28 | 2021-04-16 | 深圳市裕富照明有限公司 | Lighting control device for vehicle headlight |
| CN112672479B (en) * | 2020-12-28 | 2023-01-06 | 深圳市裕富照明有限公司 | Lighting control device for vehicle headlight |
| CN113905478A (en) * | 2021-10-21 | 2022-01-07 | 深圳市乐的美光电股份有限公司 | Lamp strip with brightness and color temperature correspondingly adjusted |
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