CN103327700A - Power control method for LED (light-emitting diode) drive power supply - Google Patents
Power control method for LED (light-emitting diode) drive power supply Download PDFInfo
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- CN103327700A CN103327700A CN2013103094082A CN201310309408A CN103327700A CN 103327700 A CN103327700 A CN 103327700A CN 2013103094082 A CN2013103094082 A CN 2013103094082A CN 201310309408 A CN201310309408 A CN 201310309408A CN 103327700 A CN103327700 A CN 103327700A
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Abstract
The invention discloses a power control method for an LED (light-emitting diode) drive power supply. A dimming control circuit is composed of an AC/DC (alternating current/direct current) power supply (2), a DC/DC (direct current/direct current) adjustable constant-current driver (3), a light source plate with LED chips (4), a single chip (6), peripheral circuits of the single chip (6), an energy storage capacitor (7), a switch (1) and a non-volatile flash memory (5). The energy storage capacitor (7) is used for supplying power to the single chip (6) after a power supply switch is turned off, the work is maintained for tens of milliseconds, and the single chip (6) is used for detecting the action of the switch by sampling the input voltage change caused by the switch (1), storing the change and adjusting the current of the DC/DC adjustable constant-current driver (3) by reading the value of the stored last switch state during nest start-up, thus controlling the light-emitting intensity of the LED chips (4), and realizing a dimming effect. The power control method disclosed by the invention is simple in circuit, reliable in working, and low in application and maintenance cost.
Description
Technical field
The present invention relates to LED light fixture driving power, particularly control to reach a kind of method of regulating the LED luminous intensity to exchanging input type constant-current LED drive current.
Background technology
For satisfying different environments for use and energy-conservation demand, the LED light fixture often needs to carry out power control, to reach the purpose of adjusting the light fixture illuminance; The LED Switching Power Supply itself has constant-current circuit, can realize output current is regulated by additional circuit, and control by multiple control modes; Usually the method for brightness adjustment control is: 1, adopt controllable silicon to carry out light modulation; 2, adopt dedicated buss such as 485 to control; 3, adopt wireless technology to control.Carry out the modulation of the angle of flow with controllable silicon, make electrical network receive pollution, power factor descends, and brings other side effects simultaneously; And with the method for total line traffic control or wireless technology control, all must adopt extra communication modes, as bus communication, wireless telecommunications, to transmit dimming control signal, so just make that circuit is complicated or need the extra control line that increases, the dimming function light fixture is installed also to be needed to connect up again, and use cost greatly increases, and this brings very big inconvenience to installation and maintenance; So the LED driving power control mode equipment complexity of using at present, the cost height makes the LED light modulation can't be promoted fast in development and in using.
Summary of the invention
Cause equipment complexity, problem that cost is high in order to solve above-mentioned control mode, the present invention adopts novel segmented dimming mode, utilizes the number of times of switch, is identified by driving power, and corresponding different constant current output, the dimming characteristic of realization LED light fixture taked; Technical scheme of the present invention is: adopt an AC/DC power supply, DC/DC adjustable constant-flow drives, a piece of cloth is provided with led chip light source board, single-chip microcomputer and peripheral circuit, a storage capacitor, a switch and a non-volatile flash memory to form adjusting control circuit; Described AC/DC power supply is system's main power source, and it drives for the DC/DC adjustable constant-flow and the single-chip microcomputer power supply; Described DC/DC adjustable constant-flow drives to be responsible for led chip is powered; Described storage capacitor is closed the back at mains switch single-chip microcomputer is powered, keep the tens of milliseconds of its work, described single-chip microcomputer is under the situation of storage capacitor power supply, the input voltage that causes owing to switch changes by sampling, come the sense switch action, and this variation stored, when treating to start shooting next time, single-chip microcomputer is by reading the numerical value of a preceding on off state of having stored, the electric current that the DC/DC adjustable constant-flow drives is regulated, thereby to controlling of the luminous intensity of led chip, realize dimming effect.
Concrete control step of the present invention is:
A. system power-up;
B. the storing value in the single-chip microcomputer reading non-volatile flash memory, and judge whether this numerical value surpasses predetermined value N, if surpass, execution in step C then, if do not surpass, execution in step D then;
C. single-chip microcomputer makes zero the storing value in the non-volatile flash memory;
D. single-chip microcomputer drives the DC/DC adjustable constant-flow according to the storing value in the non-volatile flash memory and carries out corresponding current-modulation;
E. led chip sends the light of respective strengths under the driving that the DC/DC adjustable constant-flow drives;
F. the timer of single-chip microcomputer picks up counting, and judges that whether timing surpasses M second, if surpass, and execution in step G then, if do not surpass, execution in step H then;
G. single-chip microcomputer makes zero the storing value in the non-volatile flash memory, the The whole control circuit by the state work of the modulated LED luminous intensity that makes until system cut-off;
H. single-chip microcomputer changes to have judged whether switch motion by judging the AC/DC power source voltage, if having, if execution in step I then is not then redirect execution in step F;
I. single-chip microcomputer increases by 1 with the storing value in the non-volatile flash memory, the The whole control circuit by the state work of the modulated LED luminous intensity that makes until system cut-off.
The present invention adopts the beneficial effect of above technical scheme to be: the present invention realizes dimming function by a simple circuit and a switch, has saved complicated control bus and expensive equipment; Install simultaneously and use simple, reliable operation, use and maintenance cost low, have market application foreground widely.
Description of drawings
Fig. 1 is control section circuit theory diagrams among the present invention.
Fig. 2 is control flow chart of steps of the present invention.
Among the figure, 1, switch, 2, the AC/DC power supply, 3, the DC/DC adjustable constant-flow drives, 4, led chip, 5, non-volatile flash memory, 6, single-chip microcomputer, 7, storage capacitor.
Embodiment
The present invention adopts an AC/DC power supply 2, DC/DC adjustable constant-flow drive 3, a piece of cloth is provided with led chip 4 light source board, single-chip microcomputer 6 and peripheral circuit, a storage capacitor 7, a switch 1 and a non-volatile flash memory 5 to form adjusting control circuits; Described AC/DC power supply 2 is system's main power source, and it is the driving 3 of DC/DC adjustable constant-flow and single-chip microcomputer 6 power supplies; Described DC/DC adjustable constant-flow drives 3 and is responsible for led chip 4 is powered; Described storage capacitor 7 is closed the back to single-chip microcomputer 6 power supplies at mains switch 1, keep the tens of milliseconds of its work, described single-chip microcomputer 6 is under the situation of storage capacitor 7 power supplies, the input voltage that causes owing to switch 1 changes by sampling, come the sense switch action, and this variation stored, when treating to start shooting next time, single-chip microcomputer 6 is by reading the numerical value of a preceding on off state of having stored, electric current to DC/DC adjustable constant-flow driving 3 is regulated, thereby to controlling of the luminous intensity of led chip, realize dimming effect.
During operate as normal, in official hour, carry out sample detecting by 6 pairs of input voltages after the AD conversion of single-chip microcomputer, the action of monitoring input switch, also namely: when switch 1 cuts out, input voltage is reduced to 0V from normal (as 220V), direct current for single-chip microcomputer 6 also is closed simultaneously, but because the existence of storage capacitor 7 is arranged, therefore single-chip microcomputer 6 cuts out the back at switch 1 and powers to keep tens of milliseconds that work on by storage capacitor 7, single-chip microcomputer 6 detects by the input voltage to AD and obtains the signal that switch cuts out like this, and converts shutdown signal to the switch number of times, then is recorded in the non-volatile flash memory 5; When surpassing official hour, and do not have switch motion, 6 of single-chip microcomputers can make zero the numerical value of non-volatile flash memory 5; When turning on the power switch by the time next time, single-chip microcomputer 6 powers up work, at first detect the record in the non-volatile flash memory 5, find the numerical value of switch number of times, thereby according to different switch number of times numerical value different dimming control signals is set, control DC/DC adjustable constant-flow drives 3 output current, like this, just can realize dimming function by the switch number of times, and need not to increase control bus or power supply is modulated.
Concrete control step of the present invention is:
A. system power-up;
B. the storing value in the single-chip microcomputer 6 reading non-volatile flash memories 5, and judge whether this numerical value surpasses predetermined value N, if surpass, execution in step C then, if do not surpass, execution in step D then;
C. single-chip microcomputer 6 makes zero the storing value in the non-volatile flash memory 5;
D. single-chip microcomputer 6 carries out corresponding current-modulation according to the storing value in the non-volatile flash memory 5 to DC/DC adjustable constant-flow driving 3;
E. led chip 4 sends the light of respective strengths under the driving of DC/DC adjustable constant-flow driving 3;
F. the timer of single-chip microcomputer 6 picks up counting, and judges that whether timing surpasses M second, if surpass, and execution in step G then, if do not surpass, execution in step H then;
G. single-chip microcomputer 6 makes zero the storing value in the non-volatile flash memory 5, the The whole control circuit by the state work of the modulated LED luminous intensity that makes until system cut-off;
H. single-chip microcomputer 6 has judged whether switch motion by the change in voltage of judging AC/DC power supply 2, if having, if execution in step I then is not then redirect execution in step F;
I. single-chip microcomputer 6 increases by 1 with the storing value in the non-volatile flash memory 5, the The whole control circuit by the state work of the modulated LED luminous intensity that makes until system cut-off.
Above-mentioned embodiment is exemplary, is to be the restriction that this patent is comprised scope in order better to make those skilled in the art can understand this patent, can not to be interpreted as; So long as the technology contents essence of making according to the disclosed technical scheme of this patent is identical or any change or the modification that are equal to, all fall into the scope that this patent comprises.
Claims (1)
1. a LED driving power Poewr control method is characterized in that: adopt an AC/DC power supply (2), a DC/DC adjustable constant-flow driving (3), a piece of cloth to be provided with light source board, a single-chip microcomputer (6) and peripheral circuit thereof, a storage capacitor (7), a switch (1) and a non-volatile flash memory (5) the composition adjusting control circuit of led chip (4); Described AC/DC power supply (2) is system's main power source, and it drives (3) and single-chip microcomputer (6) power supply for the DC/DC adjustable constant-flow; Described DC/DC adjustable constant-flow drives (3) and is responsible for led chip (4) is powered; Described storage capacitor (7) is closed the back at mains switch single-chip microcomputer (6) is powered, keep the tens of milliseconds of its work, described single-chip microcomputer (6) is under the situation of storage capacitor (7) power supply, the input voltage that causes owing to switch (1) changes by sampling, come the sense switch action, and this variation stored, when treating to start shooting next time, single-chip microcomputer (6) is by reading the numerical value of a preceding on off state of having stored, the electric current that the DC/DC adjustable constant-flow is driven (3) is regulated, thereby the luminous intensity to led chip (4) is controlled, and realizes dimming effect; Concrete control step is:
A. system power-up;
B. the storing value in single-chip microcomputer (6) the reading non-volatile flash memory (5), and judge whether this numerical value surpasses predetermined value N, if surpass, execution in step C then, if do not surpass, execution in step D then;
C. single-chip microcomputer (6) makes zero the storing value in the non-volatile flash memory (5);
D. single-chip microcomputer (6) drives the current-modulation that (3) carry out correspondence according to the storing value in the non-volatile flash memory (5) to the DC/DC adjustable constant-flow;
E. led chip (4) drives under the driving of (3) at the DC/DC adjustable constant-flow, sends the light of respective strengths;
F. the timer of single-chip microcomputer (6) picks up counting, and judges that whether timing surpasses M second, if surpass, and execution in step G then, if do not surpass, execution in step H then;
G. single-chip microcomputer (6) makes zero the storing value in the non-volatile flash memory (5), the The whole control circuit by the state work of the modulated LED luminous intensity that makes until system cut-off;
H. single-chip microcomputer (6) has judged whether switch motion by the change in voltage of judging AC/DC power supply (2), if having, if execution in step I then is not then redirect execution in step F;
I. single-chip microcomputer increases by 1 with the storing value in the non-volatile flash memory (5), the The whole control circuit by the state work of the modulated LED luminous intensity that makes until system cut-off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103094082A CN103327700A (en) | 2013-07-23 | 2013-07-23 | Power control method for LED (light-emitting diode) drive power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103094082A CN103327700A (en) | 2013-07-23 | 2013-07-23 | Power control method for LED (light-emitting diode) drive power supply |
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| CN103327700A true CN103327700A (en) | 2013-09-25 |
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| CN2013103094082A Pending CN103327700A (en) | 2013-07-23 | 2013-07-23 | Power control method for LED (light-emitting diode) drive power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016008141A1 (en) * | 2014-07-17 | 2016-01-21 | iWatt Integrated Circuits Technology (Tianjin) Limited | Adaptive power balancing in led lamps |
| CN109548231A (en) * | 2018-10-26 | 2019-03-29 | 惠州市华阳光电技术有限公司 | A kind of switch dimming method based on memory |
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| CN201307959Y (en) * | 2008-11-07 | 2009-09-09 | 珠海麟盛电子科技有限公司 | Impulse width regulating circuit and corresponding LED switch power supply as well as LED lighting circuit |
| CN202209547U (en) * | 2011-08-17 | 2012-05-02 | 深圳市华彩光电有限公司 | Novel energy-saving LED daylight lamp |
| CN102802317A (en) * | 2012-08-28 | 2012-11-28 | 成都启臣微电子有限公司 | Adjusting device of LED (Light-Emitting Diode) light source |
| CN202587537U (en) * | 2012-05-21 | 2012-12-05 | 四川新力光源有限公司 | LED (Light Emitting Diode) device with adjustable brightness |
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2013
- 2013-07-23 CN CN2013103094082A patent/CN103327700A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307959Y (en) * | 2008-11-07 | 2009-09-09 | 珠海麟盛电子科技有限公司 | Impulse width regulating circuit and corresponding LED switch power supply as well as LED lighting circuit |
| CN202209547U (en) * | 2011-08-17 | 2012-05-02 | 深圳市华彩光电有限公司 | Novel energy-saving LED daylight lamp |
| CN202587537U (en) * | 2012-05-21 | 2012-12-05 | 四川新力光源有限公司 | LED (Light Emitting Diode) device with adjustable brightness |
| CN102802317A (en) * | 2012-08-28 | 2012-11-28 | 成都启臣微电子有限公司 | Adjusting device of LED (Light-Emitting Diode) light source |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016008141A1 (en) * | 2014-07-17 | 2016-01-21 | iWatt Integrated Circuits Technology (Tianjin) Limited | Adaptive power balancing in led lamps |
| US11445586B2 (en) | 2014-07-17 | 2022-09-13 | Dialog Integrated Circuits (Tianjian) Limited | Adaptive power balancing in LED lamps |
| CN109548231A (en) * | 2018-10-26 | 2019-03-29 | 惠州市华阳光电技术有限公司 | A kind of switch dimming method based on memory |
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Application publication date: 20130925 |