CN107484299B - LED lamp brightness and color temperature adjusting control circuit based on one-way PWM and implementation method thereof - Google Patents
LED lamp brightness and color temperature adjusting control circuit based on one-way PWM and implementation method thereof Download PDFInfo
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- CN107484299B CN107484299B CN201710810278.9A CN201710810278A CN107484299B CN 107484299 B CN107484299 B CN 107484299B CN 201710810278 A CN201710810278 A CN 201710810278A CN 107484299 B CN107484299 B CN 107484299B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a single-path PWM-based LED lamp brightness and color temperature adjusting control circuit, which comprises a power supply VCC, a signal output device and two LED lamp circuits electrically connected between the power supply VCC and the signal output device, wherein the power supply VCC is connected with the input end of the signal output device; the two LED lamp circuits comprise a white light positive lamp circuit and a white light warm lamp circuit, wherein the white light positive lamp circuit comprises a triode Q1 with a base electrode connected with the output end of the signal output device and a white light positive lamp group electrically connected with a collector electrode of the triode Q1, and the white light warm lamp circuit comprises a triode Q2 with a base electrode electrically connected with the collector electrode of the triode Q1, an emitter electrode electrically connected with the output end of the signal output device and a white light warm lamp group electrically connected with the collector electrode of the triode Q2; the positive white lamp set and the warm white lamp set are connected in parallel and then connected with the power supply VCC, and a capacitor C1 and a resistor R6 are further connected between the base electrode of the triode Q1 and the output end of the signal output device. The invention has simple circuit and high practical value.
Description
Technical Field
The invention relates to an LED lamp, in particular to a single-channel PWM-based LED lamp brightness and color temperature adjusting control circuit and an implementation method thereof.
Background
In the prior art, in order to achieve brightness and color temperature adjustment, an LED lamp generally adopts a two-channel design, i.e. one channel achieves low color temperature adjustment, and the other channel achieves high color temperature adjustment, as shown in fig. 1. When the signal output device is utilized for adjusting, two channels cannot be controlled simultaneously, only the color temperature or the brightness can be adjusted first, three outgoing lines and two switches or control knobs are needed, and great inconvenience is caused to practical installation and application.
Disclosure of Invention
The invention aims to provide a single-channel PWM-based LED lamp brightness and color temperature adjusting control circuit, which adopts a single-channel signal output device to adjust the brightness and the color temperature of an LED lamp at the same time, thereby providing convenience for the practical installation and application of the LED lamp.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The LED lamp brightness and color temperature adjusting control circuit based on the single-path PWM comprises a power supply VCC, a signal output device and two LED lamp circuits, wherein the signal output device is used for outputting PWM control signals, the two LED lamp circuits are electrically connected between the power supply VCC and the signal output device, and the power supply VCC is connected with the input end of the signal output device; the two LED lamp circuits comprise a positive white lamp circuit and a warm white lamp circuit, wherein the positive white lamp circuit comprises a triode Q1 with a base electrode connected with the output end of the signal output device and a positive white lamp group electrically connected with a collector electrode of the triode Q1, and the warm white lamp circuit comprises a triode Q2 with the base electrode electrically connected with the collector electrode of the triode Q1, an emitter electrode electrically connected with the output end of the signal output device and a warm white lamp group electrically connected with the collector electrode of the triode Q2; the white lamp group is connected with the power supply VCC after being connected in parallel, a capacitor C1 and a resistor R6 are further connected between the base electrode of the triode Q1 and the output end of the signal output device, the capacitor C1 and the resistor R6 are connected in parallel, and the emitter electrode of the triode Q1 is electrically connected with the output end of the signal output device.
Preferably, a resistor R4 is also connected between the power supply VCC and the capacitor C1.
Preferably, a resistor R1 is further connected between the power source VCC and the collector of the triode Q1.
Preferably, a resistor R5 is further connected between the base of the triode Q2 and the collector of the triode Q1.
Preferably, the white light group includes at least one white light, and the warm white light group includes at least one warm white light.
Preferably, the signal output device is a PWM dimming controller or a power supply capable of outputting PWM voltage.
The invention also provides a realization method of the LED lamp brightness and color temperature adjusting control circuit based on the single-channel PWM, which is characterized by comprising the following steps:
(1) When the signal output device outputs low level, the power supply VCC charges the capacitor C1 through the resistor R4, at this time, the voltage at two ends of the capacitor C1 is smaller than the conducting voltage of the triode Q1, the branch where the white lamp is positioned is in an open state, the voltage at two ends of the triode Q2 is larger than the conducting voltage of the triode Q2, the triode Q2 is in a conducting state, and the branch where the white lamp is positioned is conducted when the power supply VCC passes through the resistors R1, R5 and the triode Q2;
(2) As the duty ratio of the signal output device for outputting low level in one period is gradually increased, the warm white lamp is also gradually lightened, and the voltage at two ends of the capacitor C1 is also gradually increased; when the voltage at two ends of the capacitor C1 is increased to be larger than the conducting voltage of the triode Q1, the conducting Q2 of the triode Q1 is turned off, the branch where the positive white lamp is located is conducted, and the warm white lamp is extinguished;
(3) As the duty ratio of the signal output device for outputting low level in one period continues to increase, the brightness of the warm-color lamp gradually decreases, and the brightness of the white lamp gradually increases, and the color temperature gradually increases at the moment;
(4) Along with the signal output device outputting the duty ratio of the low level in a complete period from small to large, the color temperature gradually rises from low in the complete period, the warm white lamp is finally extinguished, the brightness of the positive white lamp reaches the strongest, and the color temperature reaches the highest, so that the brightness and the color temperature of the LED lamp are simultaneously regulated through the signal output device.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention has simple circuit and convenient realization, can simultaneously regulate the color temperature and the brightness of two paths of LED lamps by only one signal output device, and reduces one outgoing line, thereby greatly reducing the actual installation and application difficulty and having high practical value.
(2) The invention can realize flexible adjustment of circuits and structures according to different environments, has strong environment adaptability and can meet the application requirements of different environments.
(3) The invention has good seamless replacement for the existing brightness adjusting lamp in the market, and can realize the simultaneous adjustment of brightness and color temperature without changing a control device.
Drawings
Fig. 1 is a schematic circuit diagram of the prior art.
Fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
The invention will be further illustrated by the following description and examples, which include but are not limited to the following examples.
Examples
As shown in fig. 2, the LED lamp brightness and color temperature adjusting control circuit based on the single-path PWM disclosed by the invention comprises a power supply VCC and a signal output device for outputting PWM control signals, and two LED lamp circuits electrically connected between the power supply VCC and the signal output device, wherein the power supply VCC is connected with the input end of the signal output device; the two LED lamp circuits comprise a positive white lamp circuit and a warm white lamp circuit, wherein the positive white lamp circuit comprises a triode Q1 with a base electrode connected with the output end of the signal output device and a positive white lamp group electrically connected with a collector electrode of the triode Q1, and the warm white lamp circuit comprises a triode Q2 with the base electrode electrically connected with the collector electrode of the triode Q1, an emitter electrode electrically connected with the output end of the signal output device and a warm white lamp group electrically connected with the collector electrode of the triode Q2; the white lamp group is connected with the power supply VCC after being connected in parallel, a capacitor C1 and a resistor R6 are further connected between the base electrode of the triode Q1 and the output end of the signal output device, the capacitor C1 and the resistor R6 are connected in parallel, and the emitter electrode of the triode Q1 is electrically connected with the output end of the signal output device.
Preferably, a resistor R4 is also connected between the power supply VCC and the capacitor C1.
Preferably, a resistor R1 is further connected between the power source VCC and the collector of the triode Q1.
Preferably, a resistor R5 is further connected between the base of the triode Q2 and the collector of the triode Q1.
Preferably, the white light group includes at least one white light, and the warm white light group includes at least one warm white light.
Preferably, the signal output device is a PWM dimming controller or a power supply capable of outputting PWM voltage.
The invention also provides a realization method of the LED lamp brightness and color temperature adjusting control circuit based on the single-channel PWM, which is characterized by comprising the following steps:
(1) When the signal output device outputs low level, the power supply VCC charges the capacitor C1 through the resistor R4, at this time, the voltage at two ends of the capacitor C1 is smaller than the conducting voltage of the triode Q1, the branch where the white lamp is positioned is in an open state, the voltage at two ends of the triode Q2 is larger than the conducting voltage of the triode Q2, the triode Q2 is in a conducting state, and the branch where the white lamp is positioned is conducted when the power supply VCC passes through the resistors R1, R5 and the triode Q2;
(2) As the duty ratio of the signal output device for outputting low level in one period is gradually increased, the warm white lamp is also gradually lightened, and the voltage at two ends of the capacitor C1 is also gradually increased; when the voltage at two ends of the capacitor C1 is increased to be larger than the conducting voltage of the triode Q1, the conducting Q2 of the triode Q1 is turned off, the branch where the positive white lamp is located is conducted, and the warm white lamp is extinguished;
(3) As the duty ratio of the signal output device for outputting low level in one period continues to increase, the brightness of the warm-color lamp gradually decreases, and the brightness of the white lamp gradually increases, and the color temperature gradually increases at the moment; ;
(4) Along with the signal output device outputting the duty ratio of the low level in a complete period from small to large, the color temperature gradually rises from low in the complete period, the warm white lamp is finally extinguished, the brightness of the positive white lamp reaches the strongest, and the color temperature reaches the highest, so that the brightness and the color temperature of the LED lamp are simultaneously regulated through the signal output device.
According to the invention, through improvement of the circuit, the two paths of LED lamps are simultaneously regulated in color temperature and brightness by one signal output device, the circuit is simple in structure, convenient to realize, low in cost, more convenient for practical installation and application, and high in practical value.
The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or color changes made in the main design concept and spirit of the present invention are still consistent with the present invention, and all the technical problems to be solved are included in the scope of the present invention.
Claims (7)
1. The LED lamp brightness and color temperature adjusting control circuit based on the single-path PWM is characterized by comprising a power supply VCC, a signal output device and two LED lamp circuits, wherein the signal output device is used for outputting PWM control signals, the two LED lamp circuits are electrically connected between the power supply VCC and the signal output device, and the power supply VCC is connected with the input end of the signal output device; the two LED lamp circuits comprise a positive white lamp circuit and a warm white lamp circuit, wherein the positive white lamp circuit comprises a triode Q1 with a base electrode connected with the output end of the signal output device and a positive white lamp group electrically connected with a collector electrode of the triode Q1, and the warm white lamp circuit comprises a triode Q2 with the base electrode electrically connected with the collector electrode of the triode Q1, an emitter electrode electrically connected with the output end of the signal output device and a warm white lamp group electrically connected with the collector electrode of the triode Q2; the white lamp group is connected with the power supply VCC after being connected in parallel, a capacitor C1 and a resistor R6 are further connected between the base electrode of the triode Q1 and the output end of the signal output device, the capacitor C1 and the resistor R6 are connected in parallel, and the emitter electrode of the triode Q1 is electrically connected with the output end of the signal output device.
2. The circuit for controlling the brightness and color temperature of the LED lamp based on the single-path PWM according to claim 1, wherein a resistor R4 is also connected between the power supply VCC and the capacitor C1.
3. The circuit for controlling the brightness and color temperature of the LED lamp based on the single-path PWM according to claim 2, wherein a resistor R1 is also connected between the power supply VCC and the collector of the triode Q1.
4. The circuit of claim 3, wherein a resistor R5 is further connected between the base of the triode Q2 and the collector of the triode Q1.
5. The single-pass PWM-based LED lamp dimming color temperature control circuit of claim 4, wherein the set of positive white lamps comprises at least one positive white lamp and the set of warm white lamps comprises at least one warm white lamp.
6. The single-channel PWM-based LED lamp brightness and color temperature control circuit according to claim 5, wherein the signal output device is a PWM dimming controller or a power supply capable of outputting PWM voltage.
7. The realization method of the LED lamp brightness and color temperature adjusting control circuit based on the single-channel PWM is characterized by comprising the following steps of:
(1) When the signal output device outputs low level, the power supply VCC charges the capacitor C1 through the resistor R4, at this time, the voltage at two ends of the capacitor C1 is smaller than the conducting voltage of the triode Q1, the branch where the white lamp is positioned is in an open state, the voltage at two ends of the triode Q2 is larger than the conducting voltage of the triode Q2, the triode Q2 is in a conducting state, and the branch where the white lamp is positioned is conducted when the power supply VCC passes through the resistors R1, R5 and the triode Q2;
(2) As the duty ratio of the signal output device for outputting low level in one period is gradually increased, the warm white lamp is also gradually lightened, and the voltage at two ends of the capacitor C1 is also gradually increased; when the voltage at two ends of the capacitor C1 is increased to be larger than the conducting voltage of the triode Q1, the conducting Q2 of the triode Q1 is turned off, the branch where the positive white lamp is located is conducted, and the warm white lamp is extinguished;
(3) As the duty ratio of the signal output device for outputting low level in one period continues to increase, the brightness of the warm-color lamp gradually decreases, and the brightness of the white lamp gradually increases, and the color temperature gradually increases at the moment;
(4) Along with the signal output device outputting the duty ratio of the low level in a complete period from small to large, the color temperature gradually rises from low in the complete period, the warm white lamp is finally extinguished, the brightness of the positive white lamp reaches the strongest, and the color temperature reaches the highest, so that the brightness and the color temperature of the LED lamp are simultaneously regulated through the signal output device.
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| CN108112121A (en) * | 2017-12-19 | 2018-06-01 | 珠海格力电器股份有限公司 | L ED lighting circuit and control method thereof |
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| CN110856303A (en) * | 2019-12-11 | 2020-02-28 | 四川蓝景光电技术有限责任公司 | LED lamp color temperature and brightness linear control circuit |
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