CN101990331A - LED-based TRIAC dimming method - Google Patents
LED-based TRIAC dimming method Download PDFInfo
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- CN101990331A CN101990331A CN2009100560394A CN200910056039A CN101990331A CN 101990331 A CN101990331 A CN 101990331A CN 2009100560394 A CN2009100560394 A CN 2009100560394A CN 200910056039 A CN200910056039 A CN 200910056039A CN 101990331 A CN101990331 A CN 101990331A
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Abstract
The invention relates to a light emitting diode (LED)-based TRIAC dimming method. Because the characteristic of the LED is direct current driving, and the voltage of each LED is not completely the same, a fixed current mode needs to be used for driving and the characteristics of the voltage and the current are not completely in linear variation, the conventional in-wall TRIAC dimming mode cannot be directly used for the input voltage; the variation of an input power supply is dynamically detected by interception of input waveforms through a TRIAC dimmer by using a micro-programmed control unit (MCU) in a lamp, and the LED is dimmed in a pulse width modulation (PWM) mode through the processing of the MCU, so that the aim of continuously and stably adjusting the brightness of the LED lamp is fulfilled.
Description
Technical field
The present invention relates to the LED lighting field, particularly relate to a kind of LED-based TRIAC light-dimming method.
Background technology
The LED lamp of high brightness is long owing to having the life-span, the luminous efficiency height, power consumption less and advantage such as can work under environment such as low temperature, become a kind of desirable replacement scheme of conventional incandescent gradually, and how can make the LED lamp stable continuous work of high brightness, be the urgency technical problem to be solved of industry always.
Usually, the LED of high brightness has two kinds of basic light-dimming methods.A kind of is PWM (pulse-width modulation) light-dimming method, promptly under greater than some frequency of 200Hz with 0% to 100% different ON time percentage (duty ratio) turn-on and turn-off LED, at the full current work of conduction period LED, and on blocking interval LED, not having electric current to flow through, this has just guaranteed the consistency of LED color.Another kind method is the magnitude of current of control flows through the LED string, because the influence of LED heating can cause the voltage of LED string to descend, thereby causes the aberration between the LED lamp.
Be widely used and utilize TRIAC (triode ac switch) dimmer that common incandescent lamp is carried out light modulation, the operation principle of TRIAC dimmer as shown in Figure 1.
Utilize the RC circuit to produce a trigger voltage and make the TRIAC switch conduction at the grid of TRIAC switch, because RC can cause the delay of ON time, when resistance R is big more, the charging current of capacitor C is more little, make the current potential of capacitor C reach to be enough to that the time of triggering the TRIAC switch is long more, therefore the trigger angle on the TRIAC grid is big more, can shorten the ON time of TRIAC dimmer like this or dwindle its angle of flow, therefore, the average power supply of load acquisition just can reduce.
That is to say that the ON time with the TRIAC dimmer decides, ON time is long, and voltage just raises, otherwise ON time is short, and voltage just reduces, and utilizes the variation of voltage to reach the purpose of adjusting lamp brightness.
Because the LED self character is a DC driven, and the operating voltage of every LEDs is all incomplete same, usually need to adopt the mode of decide electric current to drive, and the characteristic of its electric current and voltage is not linear fully variation, so can't be directly to the traditional in-wall TRIAC light modulation of input voltage employing.
The present invention is just based in order to overcome above-mentioned defective, invented a kind of LED-based TRIAC light regulating technology, utilize the built-in MCU of light fixture itself (microcontroller), utilize of the intercepting of TRIAC dimmer to the input waveform, the variation of detecting input power supply, thereby by the processing of MCU LED is carried out light modulation in the PWM mode again, realize the purpose of the adjustment LED lamp brightness of continous-stable.
Summary of the invention
Technical problem to be solved by this invention provides a kind of LED-based TRIAC light-dimming method.To solve problems of the prior art, technical scheme provided by the invention is as follows:
This light adjusting circuit comprises:
The TRIAC dimmer switch is used for the AC wave shape cutting to the civil power input, to determine a conduction value;
The detecting line unit is used to detect the waveform through after the cutting of TRIAC dimmer switch, gets second cycle turning part in each cycle and carries out rectification, obtains a voltage location;
The MCU unit based on the voltage location that obtains from the detecting line unit, is a standard with this voltage swing, converts dim signal to, and this dim signal is transferred to LED lamp drive IC unit;
LED brightness is dynamically adjusted according to the dim signal that receives from MCU in the drive IC unit.
A kind of LED-based TRIAC light-dimming method is provided, and this light-dimming method comprises step:
Step 1, by the TRIAC dimmer switch, to 220V, the AC wave shape cutting of 50Hz civil power input can make the conduction value of LED light fixture conducting to determine one, and this conduction value is sent to the detecting line unit;
Waveform after step 2, detecting line unit are cut through the TRIAC dimmer switch by detecting is got second cycle turning part in each cycle and is carried out rectification, obtains a voltage location;
Step 3, micro controller unit is standard based on the voltage location that obtains from the detecting line unit with this voltage swing, converts dim signal to, and this dim signal is transferred to LED lamp drive IC unit;
Step 4, LED brightness is dynamically adjusted according to the dim signal that receives from microcontroller in the drive IC unit.
Wherein, the voltage location in the step 2 can change with the position of TRIAC dimmer switch
Description of drawings
Fig. 1 is a TRIAC switch schematic diagram.
Fig. 2 is a LED light fixture TRIAC light modulation schematic diagram of the present invention.
Fig. 3 is the oscillogram of the present invention behind the TRIAC dimmer switch.
Fig. 4 is the oscillogram of the present invention after the detecting line transfer.
Fig. 5 is the oscillogram of the present invention behind comparator.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
To the process of LED light fixture light modulation as shown in Figure 2, concrete light adjusting circuit comprises:
The TRIAC dimmer switch is used for the AC wave shape cutting to the civil power input, to determine a conduction value, as shown in Figure 3;
The detecting line unit is used to detect the waveform through after the cutting of TRIAC dimmer switch, gets second cycle turning part in each cycle and carries out rectification, obtains a voltage location, as shown in Figure 4;
The MCU unit based on the voltage location that obtains from the detecting line unit, as shown in Figure 5, is a standard with this voltage swing, converts dim signal to, and this dim signal is transferred to LED lamp drive IC unit;
LED brightness is dynamically adjusted according to the dim signal that receives from MCU in the drive IC unit.
A kind of LED-based TRIAC light-dimming method is provided, and this light-dimming method comprises step:
Step 1, by the TRIAC dimmer switch, to 220V, the AC wave shape cutting of 50Hz civil power input can make the conduction value of LED light fixture conducting to determine one, and this conduction value is sent to the detecting line unit;
Waveform after step 2, detecting line unit are cut through the TRIAC dimmer switch by detecting is got second cycle turning part in each cycle and is carried out rectification, obtains a voltage location;
Step 3, micro controller unit is standard based on the voltage location that obtains from the detecting line unit with this voltage swing, converts dim signal to, and this dim signal is transferred to LED lamp drive IC unit;
Step 4, LED brightness is dynamically adjusted according to the dim signal that receives from microcontroller in the drive IC unit.
Wherein, the voltage location in the step 2 can change with the position of TRIAC dimmer switch, when by adjusting the switch rotation, makes the conducting angle big more, and this position just can and then raise, otherwise, making that the angle of flow is more little, this position just can and then reduce.
TRIAC switch in the present embodiment is that commercially available any TRIAC dimmer switch all can, only need such dimmer switch is inserted the parallel/serial LED lamp circuit that connects, be equipped with the software control procedure in microcontroller MCU again, can realize adjusting simply and easily the LED light fixture.
By of the adjusting of above-mentioned TRIAC dimmer switch to the input current of LED, can provide stable power supply for LED, make the LED light fixture have consistent chromaticity, can not cause aberration to realize easily the light path of LED light fixture is regulated.
Though the present invention is illustrated hereinbefore according to preferred embodiment of the present invention, this does not represent that protection scope of the present invention is confined to above-mentioned structure or step, if by structure that claim of the present invention covered all within protection range.Those skilled in the art can be developed the equivalent substitution that at an easy rate after reading above-mentioned explanation, and substituting of these equivalences also is within the scope that this case requires.
Claims (2)
1. LED-based TRIAC light-dimming method, this light-dimming method comprises step:
Step 1, by the TRIAC dimmer switch, to 220V, the AC wave shape cutting of 50Hz civil power input can make the conduction value of LED light fixture conducting to determine one, and this conduction value is sent to the detecting line unit;
Waveform after step 2, detecting line unit are cut through the TRIAC dimmer switch by detecting is got second cycle turning part in each cycle and is carried out rectification, obtains a voltage location;
Step 3, micro controller unit is standard based on the voltage location that obtains from the detecting line unit with this voltage swing, converts dim signal to, and this dim signal is transferred to LED lamp drive IC unit;
Step 4, LED brightness is dynamically adjusted according to the dim signal that receives from microcontroller in the drive IC unit.
2. light-dimming method as claimed in claim 1, wherein the voltage location in the step 2 can change with the adjustment of TRIAC dimmer switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100560394A CN101990331A (en) | 2009-08-07 | 2009-08-07 | LED-based TRIAC dimming method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100560394A CN101990331A (en) | 2009-08-07 | 2009-08-07 | LED-based TRIAC dimming method |
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| Publication Number | Publication Date |
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| CN101990331A true CN101990331A (en) | 2011-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100560394A Pending CN101990331A (en) | 2009-08-07 | 2009-08-07 | LED-based TRIAC dimming method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188849A (en) * | 2011-12-31 | 2013-07-03 | 博计电子股份有限公司 | Digital alternating current dimming control circuit |
| CN104035348A (en) * | 2014-05-29 | 2014-09-10 | 东莞高仪电子科技有限公司 | Digital universal light modulator |
| CN111712016A (en) * | 2020-07-17 | 2020-09-25 | 江西发旺实业有限公司 | LED power supply method, module and LED lamp |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843061A (en) * | 2004-05-19 | 2006-10-04 | 高肯集团有限公司 | Dimming circuit for LED lighting device and means for holding TRIAC in conduction |
| US20070290874A1 (en) * | 2006-06-20 | 2007-12-20 | Jeremy Nearhoof | Touch screen with sensory feedback |
-
2009
- 2009-08-07 CN CN2009100560394A patent/CN101990331A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1843061A (en) * | 2004-05-19 | 2006-10-04 | 高肯集团有限公司 | Dimming circuit for LED lighting device and means for holding TRIAC in conduction |
| US20070290874A1 (en) * | 2006-06-20 | 2007-12-20 | Jeremy Nearhoof | Touch screen with sensory feedback |
Non-Patent Citations (1)
| Title |
|---|
| 孙政 等: "基于单片机的数字化调光装置的设计与实现", 《光学技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188849A (en) * | 2011-12-31 | 2013-07-03 | 博计电子股份有限公司 | Digital alternating current dimming control circuit |
| CN103188849B (en) * | 2011-12-31 | 2015-05-13 | 博计电子股份有限公司 | Digital alternating current dimming control circuit |
| CN104035348A (en) * | 2014-05-29 | 2014-09-10 | 东莞高仪电子科技有限公司 | Digital universal light modulator |
| CN104035348B (en) * | 2014-05-29 | 2017-01-04 | 东莞高仪电子科技有限公司 | Numerical digit universal type dimmer |
| CN111712016A (en) * | 2020-07-17 | 2020-09-25 | 江西发旺实业有限公司 | LED power supply method, module and LED lamp |
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Application publication date: 20110323 |