CN110996454A - Complementary PWM dimming method - Google Patents
Complementary PWM dimming method Download PDFInfo
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- CN110996454A CN110996454A CN201911413047.XA CN201911413047A CN110996454A CN 110996454 A CN110996454 A CN 110996454A CN 201911413047 A CN201911413047 A CN 201911413047A CN 110996454 A CN110996454 A CN 110996454A
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Abstract
The invention provides a complementary PWM dimming method, which comprises the following steps: each color temperature lamp is connected with one PWM signal end, and each two color temperature lamps are used as a color temperature unit; dividing duty ratios of two paths of color temperature lamps in the color temperature unit according to dimming requirements, wherein the sum of high level periods of the two paths of color temperature lamps is less than or equal to one PWM period; in each set of color temperature units, the second PWM signal end outputs low level within the time when the first PWM signal end outputs high level, and the first PWM signal end outputs low level within the time when the second PWM signal end outputs high level. The PWM dimming scheme designed by the method can effectively reduce the impact of heat on the color temperature lamp and the power supply voltage, and prolongs the service life of the color temperature lamp and the power supply. Meanwhile, the constant power control capability and the load capability are obviously enhanced.
Description
Technical Field
The invention relates to a complementary PWM dimming method.
Background
PWM dimming schemes are increasingly used for the adjustment of color temperature lamps. However, in the existing PWM dimming method, two color temperature lamps always have a part of high level overlap time, in the overlap time, for the power supply and the color temperature lamps, it is equivalent to two 100% output, in the short time, the heat dissipation of the power supply and the color temperature lamps is seriously impacted, especially the color temperature lamps which need constant power; for the color temperature lamp needing constant power, the short time is not constant power but double power output, the power supply needs double power at the moment, the loss of the power device is large, the heat productivity is obviously improved, and the service lives of the color temperature lamp and the power supply are reduced.
Disclosure of Invention
In order to solve the above problem, the present application provides a complementary PWM dimming method, which is specifically implemented as follows:
a complementary PWM dimming method comprises the following steps:
each color temperature lamp is connected with one PWM signal end, and each two color temperature lamps are used as a color temperature unit;
dividing duty ratios of two paths of color temperature lamps in the color temperature unit according to dimming requirements, wherein the sum of high level periods of the two paths of color temperature lamps is less than or equal to one PWM period;
in each set of color temperature units, the second PWM signal end outputs low level within the time when the first PWM signal end outputs high level, and the first PWM signal end outputs low level within the time when the second PWM signal end outputs high level.
In one or more embodiments of the invention, the color temperature lamp adopts an LED lamp, and the PWM signal terminal controls the LED lamp to be turned on and off through the on/off of the power device.
In one or more embodiments of the present invention, the power device employs an NMOS, the PWM signal terminal is connected to a gate of the NMOS, a source of the NMOS is grounded, a drain of the NMOS is connected to a cathode of the LED, and an anode of the LED is connected to a high-level output terminal of the power supply.
The beneficial implementation effect brought by the invention is as follows: in each group of color temperature units, each color temperature lamp cannot generate high level at the same time of generating high level, so that the superposition of high level of power supply voltage is avoided, the impact of heat generation on the power supply voltage and the color temperature lamp is effectively reduced, and the service lives of the color temperature lamp and the power supply are prolonged. For the constant power control circuit, the constant of the power can be controlled more accurately, and the color temperature control capability is obviously improved. In addition, under the same power condition as the prior art, the PWM dimming circuit designed by the method can be connected with a load with twice rated power, and the load carrying capacity is obviously improved. When the power device is adopted to control the turn-off of the color temperature lamp, the temperature is greatly reduced, the impact and the loss on the power device can be reduced, and the service life and the stability of the dimming circuit are further improved.
Drawings
Fig. 1 is a waveform diagram of a conventional PWM dimming method;
FIG. 2 is a waveform diagram illustrating a complementary PWM dimming method according to the present invention;
fig. 3 is a schematic diagram of an application of the complementary PWM dimming method according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings 1-3 and embodiments:
fig. 1 is a waveform schematic diagram of a PWM dimming method in the prior art, where the duty cycle of one path of color temperature lamp is 60%, and the duty cycle of the other path of color temperature lamp is 40%, it can be seen that, in the overlapping 40% duty cycle time, it is equivalent to two paths of 100% output for the power supply and the color temperature lamp, and in this short time, the heat dissipation of the power supply and the color temperature lamp is severely impacted, especially for the color temperature lamp requiring constant power; for the color temperature lamp needing constant power, the short time is not constant power but double power output, the power supply source needs double power at the moment, the loss of the power device is large, the heat productivity is obviously improved, and the service lives of the color temperature lamp and the power supply source are shortened.
Therefore, the present application provides a complementary PWM dimming method, comprising the following steps:
each color temperature lamp 10 is connected with one PWM signal end, and each two color temperature lamps 10 are used as a color temperature unit 1;
dividing duty ratios of the two color temperature lamps 10 in the color temperature unit 1 according to dimming requirements, wherein the sum of high level periods of the two color temperature lamps 10 is less than or equal to one PWM period;
in each set of color temperature unit 1, the second PWM signal terminal 21 outputs a low level during a time when the first PWM signal terminal 20 outputs a high level, and the first PWM signal terminal 20 outputs a low level during a time when the second PWM signal terminal 21 outputs a high level.
Fig. 2 is a waveform schematic diagram of a complementary PWM dimming method according to the present invention, and according to the PWM dimming scheme designed by the method, when there is only one color temperature unit 1 in the circuit, only one color temperature lamp 10 is in operation at each time for the power supply and the color temperature lamp 10, there is no overlapping time, and the impact on the color temperature lamp 10 and the power supply is small; when a plurality of color temperature units 1 are arranged in the circuit, the impact on the color temperature lamp 10 is obviously reduced compared with the existing control method, the heat productivity is also obviously reduced, and the service lives of the color temperature lamp 10 and the power supply are prolonged. For the constant power control circuit, the constant of the power can be controlled more accurately, and the color temperature control capability is obviously improved. In addition, under the same power condition as the prior art, the PWM dimming circuit designed by the method can be connected with a load with twice rated power, and the load carrying capacity is obviously improved.
The color temperature lamp 10 may be one color temperature lamp or a collection of a plurality of color temperature lamps, the sum of the high level periods of the two color temperature lamps 10 in the color temperature unit 1 is less than or equal to one PWM period, preferably, the sum of the high level periods of the two color temperature lamps 10 is equal to one PWM period, and the circuit design is simpler in this way. Different dimming requirements, each color temperature lamp 10 in the color temperature unit 1 has different duty ratio requirements, and the sum of the high level periods of the two color temperature lamps 10 is not necessarily equal to one PWM period, and may also be smaller than one PWM period, which is specifically determined according to the design requirements.
In the invention, the color temperature lamp 10 is an LED lamp, the PWM signal end 2 controls the LED lamp to be turned on and off through the on-off of a power device, preferably, the power device is an NMOS, the PWM signal end is connected with the grid electrode of the NMOS, the source electrode of the NMOS is grounded, the drain electrode of the NMOS is connected with the cathode of the LED, and the anode of the LED is connected with the high-level output end of a power supply. The switching-off of the color temperature lamp 10 is controlled by the power device NMOS, so that the response speed is higher, and the color mixing is more stable and accurate. The power device is sensitive to temperature, the device characteristics can drift due to overhigh temperature, and even the device is damaged.
The above preferred embodiments should be considered as examples of the embodiments of the present application, and technical deductions, substitutions, improvements and the like similar to, similar to or based on the embodiments of the present application should be considered as the protection scope of the present patent.
Claims (3)
1. A complementary PWM dimming method is characterized by comprising the following steps:
each color temperature lamp is connected with one PWM signal end, and each two color temperature lamps are used as a color temperature unit;
dividing duty ratios of two paths of color temperature lamps in the color temperature unit according to dimming requirements, wherein the sum of high level periods of the two paths of color temperature lamps is less than or equal to one PWM period;
in each set of color temperature units, the second PWM signal end outputs low level within the time when the first PWM signal end outputs high level, and the first PWM signal end outputs low level within the time when the second PWM signal end outputs high level.
2. The complementary PWM dimming method according to claim 1, wherein: the color temperature lamp adopts an LED lamp, and the PWM signal end controls the LED lamp to be turned on and off through the on-off of the power device.
3. The complementary PWM dimming method according to claim 2, wherein: the power device adopts an NMOS, the PWM signal end is connected with the grid electrode of the NMOS, the source electrode of the NMOS is grounded, the drain electrode of the NMOS is connected with the cathode of the LED, and the anode of the LED is connected with the high-level output end of the power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911413047.XA CN110996454A (en) | 2019-12-31 | 2019-12-31 | Complementary PWM dimming method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911413047.XA CN110996454A (en) | 2019-12-31 | 2019-12-31 | Complementary PWM dimming method |
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| CN110996454A true CN110996454A (en) | 2020-04-10 |
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Citations (8)
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| CN102316647A (en) * | 2011-09-15 | 2012-01-11 | 四川新力光源有限公司 | LED lamp color temperature adjusting driver |
| WO2012082107A1 (en) * | 2010-12-14 | 2012-06-21 | Greenwave Reality, Pte Ltd. | Light with changeable color temperature |
| CN102892223A (en) * | 2011-07-21 | 2013-01-23 | 罗姆股份有限公司 | Lighting system |
| CN103677003A (en) * | 2013-12-17 | 2014-03-26 | 江苏大学 | PWM power adjustment system and method with optimized output phase |
| CN105682295A (en) * | 2016-03-21 | 2016-06-15 | 上海东软载波微电子有限公司 | Light emitting diode (LED) control circuit |
| CN207340238U (en) * | 2017-09-20 | 2018-05-08 | 宁波升谱光电股份有限公司 | A kind of LED light control circuit |
| CN109548230A (en) * | 2018-11-05 | 2019-03-29 | 厦门阳光恩耐照明有限公司 | A kind of light modulation toning lamps and lanterns of intelligent control |
| CN109699105A (en) * | 2019-01-22 | 2019-04-30 | 新和（绍兴）绿色照明有限公司 | A kind of LED filament circuit for lamp of remote-controlled light modulation |
-
2019
- 2019-12-31 CN CN201911413047.XA patent/CN110996454A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012082107A1 (en) * | 2010-12-14 | 2012-06-21 | Greenwave Reality, Pte Ltd. | Light with changeable color temperature |
| CN102892223A (en) * | 2011-07-21 | 2013-01-23 | 罗姆股份有限公司 | Lighting system |
| CN102316647A (en) * | 2011-09-15 | 2012-01-11 | 四川新力光源有限公司 | LED lamp color temperature adjusting driver |
| CN103677003A (en) * | 2013-12-17 | 2014-03-26 | 江苏大学 | PWM power adjustment system and method with optimized output phase |
| CN105682295A (en) * | 2016-03-21 | 2016-06-15 | 上海东软载波微电子有限公司 | Light emitting diode (LED) control circuit |
| CN207340238U (en) * | 2017-09-20 | 2018-05-08 | 宁波升谱光电股份有限公司 | A kind of LED light control circuit |
| CN109548230A (en) * | 2018-11-05 | 2019-03-29 | 厦门阳光恩耐照明有限公司 | A kind of light modulation toning lamps and lanterns of intelligent control |
| CN109699105A (en) * | 2019-01-22 | 2019-04-30 | 新和（绍兴）绿色照明有限公司 | A kind of LED filament circuit for lamp of remote-controlled light modulation |
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Application publication date: 20200410 |
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