CN105517266A - LED dimming device and LED dimming method - Google Patents
LED dimming device and LED dimming method Download PDFInfo
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- CN105517266A CN105517266A CN201410495327.0A CN201410495327A CN105517266A CN 105517266 A CN105517266 A CN 105517266A CN 201410495327 A CN201410495327 A CN 201410495327A CN 105517266 A CN105517266 A CN 105517266A
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses an LED dimming device and an LED dimming method. The LED dimming device comprises a piecewise signal processing unit, a micro-control unit and a dimming unit, wherein the piecewise signal processing unit receives an input voltage and collects conduction signals, and outputs high level signals; the micro-control unit receives the high level signal and records the logic states, and outputs different control signals under different logic states; and the dimming unit receives the control signals, and has different duty ratios when the dimming unit receives different control signals so that dimming can be realized through the different duty ratios.
Description
[technical field]
The present invention relates to a kind of light modulating device, especially a kind of LED light modulating device.
[background technology]
On market, the design of dimming lamp majority is comparatively complicated, need remote controller or external light modulating device, and remote controller controls comparatively complicated, cost is higher, the lamp installation of external dimmer is also comparatively complicated, the not reserved space of installing external dimmer in a lot of family and place, this is all that the universal of dimming LED lamp causes obstacle.
On the other hand, in prior art, LED dimming lamp principle majority is the size of output current by regulating LED driver thus changes the luminosity of LED, so the precision of output current directly affects the change of LED luminance.In a lot of market, office, the places such as meeting room, when controlling many lamps, need the output brightness of every light fixture consistent, and traditional dimming mode is when low-light level exports, current precision is poor.Simultaneously, now also more and more higher to the requirement of light fixture colour temperature, when applying in high-end occasion, wish the change reduced as far as possible while changing LED luminance LED colour temperature, but when carrying out light modulation by the size of regulation output electric current to light fixture, different output currents can have an impact to colour temperature.
Therefore, in order to overcome above-mentioned defect, be necessary the LED light modulating device that a kind of improvement is provided.
[summary of the invention]
The object of the present invention is to provide a kind of LED light modulating device.
To achieve these goals, the present invention adopts following technical scheme: a kind of LED light modulating device, comprise block signal processing unit, micro-control unit and dimming unit, described block signal processing unit receives input voltage, gather Continuity signal and export high level signal, described micro-control unit receives high level signal and records logic state, different control signals is exported under different logic states, described dimming unit accepts described control signal, when receiving different control signals, described dimming unit has different duty ratios thus carries out light modulation by different duty ratios.
Preferably, described Continuity signal is triggered by the conducting of external switch.
Preferably, described dimming unit is pulse-width modulation dimming unit.
Preferably, described control signal comprises at least the first control signal and the second control signal, and the duty ratio of described dimming unit under the first control signal drives is different with the duty ratio under the second control signal driving.
Preferably, the logic state of described micro-control unit record is at least two, when described logic state is two, described micro-control unit first time receives described high level signal, is recorded as logic state one, exports the first control signal, described micro-control unit receives low level signal second time when receiving described high level signal within the set time again, be recorded as logic state two, export the second control signal, then logic state circulation.
Preferably, the input voltage that described trigger receives drops to shutoff voltage a period of time and does not again power on, and when namely described micro-control unit does not detect high level within the set time, described micro-control unit resets; When again receiving high level signal afterwards, described micro-control unit will be recorded as logic state one.
Preferably, described control unit comprises timer, and the described set time is set by the timer of described control unit.
Preferably, described block signal processing unit, micro-control unit and described dimming unit are integrated in same chip.
Compared to prior art, LED light modulating device of the present invention has following advantage: switch and pulse-width modulation dimming unit can be utilized to realize sectional dimming.
The object of the present invention is to provide a kind of LED light-dimming method.
To achieve these goals, the present invention adopts following technical scheme: a kind of LED light-dimming method, comprising:
The first step, provide reset signal and Continuity signal, described switch OFF by the shutoff of switch and conducting, voltage drop is to shutoff voltage, and be described reset signal, described switch conduction provides described Continuity signal;
Second step, when first time detects Continuity signal, is recorded as logic state one, send the first control signal, reset signal detected, when second time detects Continuity signal again in the set time, be recorded as logic state two, send the second control signal, when Continuity signal not detected in the set time after reset signal being detected, logic state resets, wherein the method at least comprises two logic states, when having two logic states, after being recorded to logic state two, logic state circulates;
3rd step, provides one by the dimming unit of duty ratio light modulation, and described first control signal controls dimming unit and has the first duty ratio, and described second control signal controls dimming unit and has the second duty ratio, by that analogy;
Described dimming unit carries out light modulation by different duty ratios.
Preferably, described second step also comprises provides a block signal processing unit, and Continuity signal is converted to high level signal by described block signal processing unit.
Preferably, described second step also comprises provides a micro-control unit, when described micro-control unit receives high level signal, records described logic state and sends described control signal.
Preferably, described dimming unit is pulse-width modulation dimming unit.
Compared to prior art, LED light-dimming method of the present invention has following advantage: switch and pulse-width modulation dimming unit can be utilized to realize sectional dimming.
[accompanying drawing explanation]
Fig. 1 is the schematic diagram of the LED light modulating device meeting the preferred embodiment for the present invention.
Fig. 2 is the circuit diagram at the LED light modulating device place meeting the preferred embodiment for the present invention.
[embodiment]
Please refer to shown in Fig. 1 to Fig. 2, a kind of LED light modulating device 1 of the preferred embodiment of the present invention, comprises block signal processing unit 10, micro-control unit 20 and dimming unit 30.Block signal processing unit 10 receives input voltage, gathers Continuity signal Vs and export triggering signal.Micro-control unit 20 receives triggering signal and records logic state, different control signals is exported under different logic states, dimming unit 30 reception control signal, when receiving different control signals, dimming unit 30 has different duty ratios thus by the brightness of different duty cycle adjustment light.In the present embodiment, LED light modulating device 1 is an integrated chip, and this integrated chip is by micro-control unit 20(MCU) and dimming unit 30 be integrated in same chip.In other embodiments, also can change as required.In the present embodiment, block signal processing unit 10 is d type flip flop, and d type flip flop will detect Continuity signal, when d type flip flop detects Continuity signal, rising edge signal can be converted into high level signal as triggering signal.In other embodiments, block signal processing unit 10 also can be other devices, such as, replace with comparator and power on detection circuit, then can not need to detect rising edge signal, or also Continuity signal can be processed into low level signal etc.
LED light modulating device 1 of the present invention is sectional dimming device, and Continuity signal Vs is triggered by the conducting of external switch (not shown).During external switch conducting, send Continuity signal, when external switch turns off, send reset signal.
Dimming unit 30 is pulse-width modulation dimming unit (PWM dimming unit).Control signal comprises at least the first control signal and the second control signal, and the duty ratio of dimming unit 30 under the first control signal drives is different with the duty ratio under the second control signal driving.The logic state that micro-control unit 20 records is at least two, when logic state is two, micro-control unit 20 first time receives high level signal, be recorded as logic state one, export the first control signal, micro-control unit 20 receive low level signal again within the set time second time when receiving high level signal, be recorded as logic state two, export the second control signal, then logic state circulation.Set time is that block signal processing unit 10 input voltage drops to shutoff voltage a period of time and again do not power on, namely when micro-control unit 20 does not detect high level within the set time, micro-control unit 20 resets, when again receiving high level signal afterwards, micro-control unit 20 will be recorded as logic state one.Micro-control unit 20 inside has timer (not shown), and the set time is set by timer.In the present embodiment, dimming unit 30 has rest-set flip-flop 40, micro-control unit 20 exports the pwm signal of certain duty ratio to Enable Pin, and Enable Pin signal is exported by the control signal of rest-set flip-flop 40 and then control LED light modulating device 1, thus the duty ratio of regulation output electric current.
In the present embodiment, LED light modulating device 1 is three-stage dimming device, and namely control signal has the first control signal, the second control signal and the 3rd control signal, and the logic state of micro-control unit 20 has three.Timer sets one set time, when block signal processing unit 10 receives reset signal, and do not receive Continuity signal again within this set time, then micro-control unit 20 resets.When external switch first time conducting, send Continuity signal, block signal processing unit 10 sends high level after Continuity signal being detected, and micro-control unit 20 is recorded as logic state one after high level signal being detected for the first time, exports the first control signal.Have no progeny when external switch closes, send reset signal, within the set time, during the conducting of external switch second time, send Continuity signal again, block signal processing unit 10 detects that reset signal sends high level signal after Continuity signal being detected again within the set time, when micro-control unit 20 detected low level signal and high level signal detected for the second time within the set time, be recorded as logic state two, export the second control signal.When external switch turns off again, send reset signal, within the set time, during external switch third time conducting, send Continuity signal again, micro-control unit 20 detects low level signal, and when within the set time, third time detects Continuity signal, be recorded as logic state three, export the 3rd control signal.When external switch turns off for the 4th time, if micro-control unit 20 detects low level signal, send reset signal, within the set time, during external switch the 4th conducting, send Continuity signal again, micro-control unit 20 detects low level signal, and when Continuity signal being detected the 4th time within the set time, is again recorded as logic state one, export the 4th control signal, i.e. logic state circulation.Have no progeny when external switch closes, send reset signal, within the set time, if external switch not conducting, then micro-control unit 20 is after reset signal being detected, within the set time, again do not receive high level signal, then micro-control unit 20 resets.Micro-control unit 20 when again receiving high level signal, is recorded as logic state one, sends the first control signal after resetting.
In other embodiments, by micro-control unit 20 ready-made program, thus to arrange LED light modulating device 1 be the required different section light modulating devices of two sections of light modulations, three-stage dimming, four sections of light modulations etc.
The present invention is used in auto-oscillation type autonomous inverter circuit, please refer to shown in Fig. 2, in the present embodiment, LED light modulating device 1 is in buck topology circuit 2, the pin VS that auto-oscillation type autonomous inverter circuit 100 comprises LED light modulating device 1 receives Continuity signal and reset signal, pin GD exports control signal, control signal control switch element Q1.Switch element Q1 can be triode or metal-oxide-semiconductor.LED light modulating device 1 exports different control signals, the duty ratio of control switch element Q1, makes to carry out light regulating by duty ratio.During work, when pin VS does not detect signal, LED light modulating device 1 normally works, and is controlled circuit by the feedback of pin CS and pin ZCD, wherein the reopening of pin ZCD control switch element Q1, the shutoff of pin CS control switch element Q1.After pin VS detects Continuity signal, micro-control unit 20 exports the control signal of certain duty ratio to Enable Pin by the program of setting, enable signal is by shown in rest-set flip-flop 40(Fig. 1) and then the pin GD output control signal of controls LED light modulating device 1, thus the duty ratio of regulation output electric current, realize the adjustment of light further.LED light modulating device 1 also comprises pin FB and pin GND, is all pin common in light fixture driving chip.
The present invention also provides a kind of LED light-dimming method, please refer to shown in Fig. 1 and Fig. 2, and this LED light-dimming method comprises:
The first step, provide reset signal and Continuity signal, switch OFF by the shutoff of switch (not shown) and conducting, voltage drop, to shutoff voltage, is reset signal, and namely switch conduction provides Continuity signal;
Second step, first time is when Continuity signal being detected, be recorded as logic state one, send the first control signal, reset signal detected, when in set time, second time detects Continuity signal again, be recorded as logic state two, send the second control signal, when Continuity signal not detected in the set time after reset signal being detected, logic state resets, wherein the method at least comprises two logic states, when having two logic states, after being recorded to logic state two, logic state circulates, when having three logic states, when being recorded as logic state three, send the 3rd control signal, and after being recorded to logic state three, logic state circulates, by that analogy.That is, when having two logic states, after being recorded to logic state two, when third time detected reset signal and Continuity signal detected within the set time, being again recorded as logic state one, sending the first control signal.When having three logic states, after being recorded to logic state three, when reset signal being detected and Continuity signal detected within the set time for the 4th time, being again recorded as logic state one, sending the first control signal.Set time is default shorter time time.
3rd step, provide one to control dimming unit 30 by dimming unit 30, first control signal of duty ratio light modulation and have the first duty ratio, the second control signal controls dimming unit 30 and has the second duty ratio, by that analogy.
Dimming unit 30 carries out light modulation by different duty ratios.
Wherein, second step also comprises provides block signal processing unit 10 and a micro-control unit 20, and Continuity signal is converted to high level signal by block signal processing unit 10.When micro-control unit 20 receives high level signal, record logic state also sends control signal.In the present embodiment, dimming unit is 30 pulse-width modulation dimming unit (PWM dimming unit).
The Continuity signal that LED light-dimming method of the present invention utilizes switch to send and reset signal, control LED light modulating device 1, by being preset in the program of the micro-control unit 20 in light modulating device 1, micro-control unit 20 is made to send different control signals after receiving different signals.
Should be noted that, embodiments of the invention have preferably implementation, and not any type of restriction is done to the present invention, any person skilled in art of being familiar with may utilize the technology contents of above-mentioned announcement change or be modified to equivalent effective embodiment, in every case the content of technical solution of the present invention is not departed from, the any amendment done above embodiment according to technical spirit of the present invention or equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (12)
1. a LED light modulating device, comprise block signal processing unit, micro-control unit and dimming unit, described block signal processing unit receives input voltage, gathers Continuity signal and export high level signal, described micro-control unit receives high level signal and records logic state, different control signals is exported under different logic states, described dimming unit accepts described control signal, when receiving different control signals, described dimming unit has different duty ratios thus carries out light modulation by different duty ratios.
2. LED light modulating device as claimed in claim 1, is characterized in that: described Continuity signal is triggered by the conducting of external switch.
3. LED light modulating device as claimed in claim 1, is characterized in that: described dimming unit is pulse-width modulation dimming unit.
4. LED light modulating device as claimed in claim 1, it is characterized in that: described control signal comprises at least the first control signal and the second control signal, the duty ratio of described dimming unit under the first control signal drives is different with the duty ratio under the second control signal driving.
5. LED light modulating device as claimed in claim 4, it is characterized in that: the logic state of described micro-control unit record is at least two, when described logic state is two, described micro-control unit first time receives described high level signal, be recorded as logic state one, export the first control signal, described micro-control unit receives low level signal second time when receiving described high level signal within the set time again, be recorded as logic state two, export the second control signal, then logic state circulation.
6. LED light modulating device as claimed in claim 5, it is characterized in that: the input voltage that described trigger receives drops to shutoff voltage a period of time and again do not power on, namely, when described micro-control unit does not detect high level within the set time, described micro-control unit resets; When again receiving high level signal afterwards, described micro-control unit will be recorded as logic state one.
7. LED light modulating device as claimed in claim 1, it is characterized in that: described control unit comprises timer, the described set time is set by the timer of described control unit.
8. LED light modulating device as claimed in claim 1, is characterized in that: described block signal processing unit, micro-control unit and described dimming unit are integrated in same chip.
9. a LED light-dimming method, comprising:
The first step, provide reset signal and Continuity signal, described switch OFF by the shutoff of switch and conducting, voltage drop is to shutoff voltage, and be described reset signal, described switch conduction provides described Continuity signal;
Second step, when first time detects Continuity signal, is recorded as logic state one, send the first control signal, reset signal detected, when second time detects Continuity signal again in the set time, be recorded as logic state two, send the second control signal, when Continuity signal not detected in the set time after reset signal being detected, logic state resets, wherein the method at least comprises two logic states, when having two logic states, after being recorded to logic state two, logic state circulates;
3rd step, provides one by the dimming unit of duty ratio light modulation, and described first control signal controls dimming unit and has the first duty ratio, and described second control signal controls dimming unit and has the second duty ratio, by that analogy;
Described dimming unit carries out light modulation by different duty ratios.
10. LED light-dimming method as claimed in claim 9, it is characterized in that: described second step also comprises provides a block signal processing unit, Continuity signal is converted to high level signal by described block signal processing unit.
11. LED light-dimming methods as claimed in claim 10, is characterized in that: described second step also comprises provides a micro-control unit, when described micro-control unit receives high level signal, record described logic state and send described control signal.
12. LED light-dimming methods as claimed in claim 9, is characterized in that: described dimming unit is pulse-width modulation dimming unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410495327.0A CN105517266A (en) | 2014-09-25 | 2014-09-25 | LED dimming device and LED dimming method |
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| CN201410495327.0A CN105517266A (en) | 2014-09-25 | 2014-09-25 | LED dimming device and LED dimming method |
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| CN105517266A true CN105517266A (en) | 2016-04-20 |
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| CN201410495327.0A Pending CN105517266A (en) | 2014-09-25 | 2014-09-25 | LED dimming device and LED dimming method |
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