CN205093002U - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN205093002U CN205093002U CN201520751438.3U CN201520751438U CN205093002U CN 205093002 U CN205093002 U CN 205093002U CN 201520751438 U CN201520751438 U CN 201520751438U CN 205093002 U CN205093002 U CN 205093002U
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- 239000002245 particle Substances 0.000 claims description 60
- 239000004065 semiconductor Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 239000008187 granular material Substances 0.000 abstract 4
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- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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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
Abstract
The utility model provides a LED drive circuit for drive LED lamp, the LED lamp includes the first LED granule of red light, the second LED granule of green glow and the third LED granule of blue light of sending out, LED drive circuit includes control chip, constant current drive module, first switch tube, second switch tube and third switch tube, and control chip passes through delay circuit and connects in first switch tube, second switch tube and third switch tube. The utility model discloses overcome the LED drive circuit of current adjustable LED luminance, colour temperature and color and adopt resistance current-limiting mode control LED electric current invariable, control effect is not good, and has increased the technical problem of consumption, simultaneously, the utility model discloses can control different LED granule operating condition according to luminance, colour temperature and the color requirement that the user set for, reach the effect of setting for, output current is stable, and no electric current overshoots, has reduced extra consumption.
Description
Technical field
The utility model relates to LED Driving technique field, is specially a kind of LED drive circuit.
Background technology
Along with LED is in the application of lighting field, the comfort level of people to lighting of home proposes new requirement, not only will control the switch of light, also requires the brightness of light, colour temperature, color tunable, and will adopt more intelligent and control mode easily.At present, market adopts a driver module mostly, export constant voltage, load is that LED multi-path particle is in parallel, in every paths of LEDs particle branch road, series resistance and switch, resistance is used for current limliting, prevents the inconsistent LED current that causes of LED particle pressure drop excessive, the duty ratio of by-pass cock, thus regulate the LED current light mixng proportion of each branch road, obtain the illuminating effect of different color and brightness.But it is constant to adopt resistance current-limiting mode can not control LED current well, and adds power consumption.
China Patent Publication No. CN102056373, publication date on May 11st, 2011, the name of utility model is called the LED illumination remote control system of a kind of brightness-adjustable and colour temperature, this application case discloses the LED illumination remote control system of a kind of brightness-adjustable and colour temperature, it adopts single-chip microcomputer to export pwm pulse, each LED drive module pwm control signal, regulates electric current to export, obtains different brightness and color temperature value after disparate modules colour mixture.Its weak point is, adopt many group driver modules to drive different LED particle respectively, such control system more complicated, cost is higher.
Utility model content
The technical problem that the utility model solves is to provide a kind of LED drive circuit, to solve the problem in above-mentioned background technology.
The technical problem that the utility model solves realizes by the following technical solutions: a kind of LED drive circuit, for driving LED lamp, described LED comprises the first LED particle glowed, second LED particle of green light and the 3rd LED particle of blue light-emitting, described LED drive circuit comprises control chip, constant-current driven module, first switching tube, second switch pipe and the 3rd switching tube, control chip is connected to the first switching tube by delay circuit, second switch pipe and the 3rd switching tube, described first LED particle, first switching tube and constant-current driven module are connected into a loop, described second LED particle, second switch pipe and constant-current driven module are connected into a loop, described 3rd LED particle, 3rd switching tube and constant-current driven module are connected into a loop, described control chip respectively with the control end of constant-current driven module, the control end of the first switching tube, the control end of second switch pipe and the control end electrical connection of the 3rd switching tube.
Further, described delay circuit comprises RC charge-discharge circuit unit, the first switch element and second switch unit, described first switch element comprises triode, second switch unit comprises metal-oxide-semiconductor, RC charge-discharge circuit unit is connected with power input and signal input part, the base stage of triode is connected with RC charge-discharge circuit unit with emitter, the emitter also earth terminal of triode, the collector electrode of triode is connected with the grid of metal-oxide-semiconductor, the source electrode of metal-oxide-semiconductor is connected with signal input part, and the drain electrode of metal-oxide-semiconductor is connected with signal output part.
Further, described RC charge-discharge circuit unit comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the first electric capacity C1 and the second electric capacity C2.Wherein, the first resistance R1, the first electric capacity C1 and the second electric capacity C2 form charging circuit; Second resistance R2, the 3rd resistance R3, the first electric capacity C1 and the second electric capacity C2 form discharge circuit.First switch element comprises triode Q1.Second switch unit comprises metal-oxide-semiconductor Q2, the first end of the first resistance R1 is connected with power input VDD, second end of the first resistance R1 is connected with the first end of the first electric capacity C1 and the first end of the second electric capacity C2 respectively, the first end of the second resistance R2 is connected with second end of the first resistance R1, second end of the second resistance R2 is connected with the base stage of triode Q1, the first end of the 3rd resistance R3 is connected with second end of the second resistance R2, second end of the 3rd resistance R3 is connected with the emitter of triode Q1, the first end of the first electric capacity C1 and first end series connection the 4th resistance R4 of the second electric capacity C2 are to be connected with signal input part D, second end of the first electric capacity C1 and second end of the second electric capacity C2 earth terminal respectively, second end of the first resistance R1 also connects the 5th resistance R5 with earth terminal.
Further, control chip can control the size of constant-current driven module output current, thus controls the brightness of LED.The first LED particle that control chip controls to glow according to certain frequency, the second LED particle of green light and the 3rd LED particle conducting successively of blue light-emitting, the same time only has at most a LED particle to be in conducting state, like this, electric current during each LED particle work is exactly the output current of constant-current driven module, ensure that the stable of output current.Control chip regulates the ON time t1 of each LED particle, t2 and t3, after mixed light process, can the color of free adjustment LED, colour temperature and brightness.
Further, described constant-current driven module comprises DC/DC driving chip, electronic switch S, diode D, inductance L, electric capacity C1, electric capacity C2 and sampling resistor R, the input of electronic switch S is electrically connected with the first end of electric capacity C1 and the positive source of LED, the second end ground connection of electric capacity C1, the output of electronic switch S is connected with the cathodic electricity of the first end of inductance L and diode D, the plus earth of diode D, the control end of electronic switch S is electrically connected with the control signal output of DC/DC driving chip, second end of inductance L is electrically connected with the voltage sample end of the first end of electric capacity C2 and DC/DC driving chip, the second end ground connection of electric capacity C2, the current sample end of DC/DC driving chip is electrically connected with the first end of sampling resistor R, the second end ground connection of sampling resistor R, the control signal input of DC/DC driving chip is electrically connected with control chip, the first end of electric capacity C2 is as the output cathode of constant-current driven module, the first end of sampling resistor R is as the output negative pole of constant-current driven module.
Further, described control chip is single-chip microcomputer.
A kind of its driving method of LED drive circuit, comprises the following steps:
Control chip calculates according to the dim signal received the size of current that constant-current driven module need export, and control constant-current driven module work, control three LED particle work according to the operating frequency f of setting, control chip controls three LED particle work and comprises the following steps simultaneously:
S1: control chip goes out according to the toning calculated signals received the time that each LED particle will light a work period T domestic demand, T=1/f=t1+t2+t3+t4, t1 is the time that the first LED particle need be lighted, t2 is the time that the second LED particle need be lighted, t3 is the time that the 3rd LED particle need be lighted, and t4 is the time that constant-current driven module need turn off;
S2: control chip controlled for the first switching tube conducting t1 time, controls second switch pipe simultaneously and the 3rd switching tube disconnects;
S3: control chip controls the second switch pipe conducting t2 time, controls the first switching tube simultaneously and the 3rd switching tube disconnects;
S4: control chip controlled for the 3rd switching tube conducting t3 time, controls the first switching tube simultaneously and second switch pipe disconnects;
S5: control chip controls the first switching tube, second switch pipe and the 3rd switching tube and disconnects, controls constant-current driven module simultaneously and quits work the t4 time;
S6: control chip controls constant-current driven module and starts working, and then jumps to step S2.
Further, described operating frequency f >=200HZ.
Compared with public technology, there is following advantage in the utility model: the LED drive circuit that the utility model overcomes existing adjustable LED luminance, colour temperature and color adopts resistance current-limiting mode control LED current constant, control effects is bad, and adds the technical problem of power consumption, simultaneously, the utility model can according to the brightness of user's setting, colour temperature and color requirements, control different LED particles work state, reach the effect of setting, outputting current steadily, no current overshoot, decreases extra power consumption.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the circuit theory diagrams of constant-current driven module of the present utility model;
Fig. 3 is the control signal sequential chart that control chip of the present utility model exports;
Fig. 4 is the circuit theory diagrams of delay control circuit of the present utility model;
Fig. 5 is RC charge-discharge circuit element circuit figure of the present utility model;
In figure: 1, the first LED particle, the 2, second LED particle, the 3, the 3rd LED particle, 4, control chip, 5, constant-current driven module, the 6, first switching tube, 7, second switch pipe, the 8, the 3rd switching tube, 9, DC/DC driving chip.
Embodiment
Object is reached and effect is easy to understand in order to make technological means of the present utility model, creation characteristic, workflow, using method, below in conjunction with the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, a kind of LED drive circuit of the present utility model, for driving LED lamp, LED comprises the first LED particle 1 glowed, second LED particle 2 of green light and the 3rd LED particle 3 of blue light-emitting, LED drive circuit comprises control chip 4, constant-current driven module 5, first switching tube 6, second switch pipe 7 and the 3rd switching tube 8, control chip 4 is connected to the first switching tube 6 by delay circuit, second switch pipe 7 and the 3rd switching tube 8, first LED particle 1, first switching tube 6 and constant-current driven module 5 are connected into a loop, second LED particle 2, second switch pipe 7 and constant-current driven module 5 are connected into a loop, 3rd LED particle 3, 3rd switching tube 8 and constant-current driven module 5 are connected into a loop, control chip 4 respectively with the control end of constant-current driven module 5, the control end of the first switching tube 6, the control end of second switch pipe 7 and the control end electrical connection of the 3rd switching tube 8, control chip 4 is single-chip microcomputer.
Described delay circuit comprises RC charge-discharge circuit unit, the first switch element and second switch unit, described first switch element comprises triode, second switch unit comprises metal-oxide-semiconductor, RC charge-discharge circuit unit is connected with power input and signal input part, the base stage of triode is connected with RC charge-discharge circuit unit with emitter, the emitter also earth terminal of triode, the collector electrode of triode is connected with the grid of metal-oxide-semiconductor, the source electrode of metal-oxide-semiconductor is connected with signal input part, and the drain electrode of metal-oxide-semiconductor is connected with signal output part.
As shown in Figure 2, constant-current driven module 5 comprises DC/DC driving chip 9, electronic switch S, diode D, inductance L, electric capacity C1, electric capacity C2 and sampling resistor R, the input of electronic switch S is electrically connected with the first end of electric capacity C1 and the positive source of LED, the second end ground connection of electric capacity C1, the output of electronic switch S is connected with the cathodic electricity of the first end of inductance L and diode D, the plus earth of diode D, the control end of electronic switch S is electrically connected with the control signal output of DC/DC driving chip 9, second end of inductance L is electrically connected with the voltage sample end of the first end of electric capacity C2 and DC/DC driving chip 9, the second end ground connection of electric capacity C2, the current sample end of DC/DC driving chip 9 is electrically connected with the first end of sampling resistor R, the second end ground connection of sampling resistor R, the control signal input of DC/DC driving chip 9 is electrically connected with control chip 4, the first end of electric capacity C2 is as the output cathode of constant-current driven module 5, the first end of sampling resistor R is as the output negative pole of constant-current driven module 5.
As shown in Figure 5, RC charge-discharge circuit unit comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the first electric capacity C1 and the second electric capacity C2.Wherein, the first resistance R1, the first electric capacity C1 and the second electric capacity C2 form charging circuit; Second resistance R2, the 3rd resistance R3, the first electric capacity C1 and the second electric capacity C2 form discharge circuit.First switch element comprises triode Q1.Second switch unit comprises metal-oxide-semiconductor Q2.
The first end of the first resistance R1 is connected with power input VDD, second end of the first resistance R1 is connected with the first end of the first electric capacity C1 and the first end of the second electric capacity C2 respectively, the first end of the second resistance R2 is connected with second end of the first resistance R1, second end of the second resistance R2 is connected with the base stage of triode Q1, the first end of the 3rd resistance R3 is connected with second end of the second resistance R2, second end of the 3rd resistance R3 is connected with the emitter of triode Q1, the first end of the first electric capacity C1 and first end series connection the 4th resistance R4 of the second electric capacity C2 are to be connected with signal input part D, second end of the first electric capacity C1 and second end of the second electric capacity C2 earth terminal respectively, second end of the first resistance R1 also connects the 5th resistance R5 with earth terminal.The application RC charge-discharge circuit unit utilizes capacitor charging, makes its both end voltage rise to the first switching means conductive.
Control chip 4 can control the size of constant-current driven module 5 output current, thus controls the brightness of LED.The first LED particle 1 that control chip 4 controls to glow according to certain frequency, the second LED particle 2 of green light and the 3rd LED particle 3 conducting successively of blue light-emitting, the same time only has at most a LED particle to be in conducting state, like this, electric current during each LED particle work is exactly the output current of constant-current driven module 5, ensure that the stable of output current.Control chip 4 regulates the ON time t1 of each LED particle, t2 and t3, after mixed light process, can the color of free adjustment LED, colour temperature and brightness.
Its driving method of a kind of LED drive circuit of the present utility model, comprise the following steps: control chip calculates according to the dim signal received the size of current that constant-current driven module need export, and control constant-current driven module work, control three LED particle work according to the operating frequency f of setting, control chip controls three LED particle work and comprises the following steps simultaneously:
S1: control chip goes out according to the toning calculated signals received the time that each LED particle will light a work period T domestic demand, T=1/f=t1+t2+t3+t4, t1 is the time that the first LED particle need be lighted, t2 is the time that the second LED particle need be lighted, t3 is the time that the 3rd LED particle need be lighted, and t4 is the time that constant-current driven module need turn off;
S2: control chip controlled for the first switching tube conducting t1 time, controls second switch pipe simultaneously and the 3rd switching tube disconnects;
S3: control chip controls the second switch pipe conducting t2 time, controls the first switching tube simultaneously and the 3rd switching tube disconnects;
S4: control chip controlled for the 3rd switching tube conducting t3 time, controls the first switching tube simultaneously and second switch pipe disconnects;
S5: control chip controls the first switching tube, second switch pipe and the 3rd switching tube and disconnects, controls constant-current driven module simultaneously and quits work the t4 time;
S6: control chip controls constant-current driven module and starts working, and then jumps to step S2.
Operating frequency f >=200HZ.As shown in Figure 3, PWM1 is the control signal of the first switching tube, and PWM2 is the control signal of second switch pipe, and PWM3 is the control signal of the 3rd switching tube.Multi-path LED load adopts sequential turn-on mode, namely only has at most a paths of LEDs load to be in conducting state simultaneously.Like this, electric current during every paths of LEDs loaded work piece is exactly the output current of constant-current driven module.Because constant-current driven module is constant current output type, electric current during so every paths of LEDs loaded work piece is invariable.Because the conducting voltage of every paths of LEDs load is inconsistent, according to the specification material of LED manufacturer, the conduction voltage drop of different LED particle is known parameter, the conduction voltage drop of the first LED particle glowed is about 2.1V, the conduction voltage drop of the second LED particle of green light is about 2.9V, and the conduction voltage drop of the 3rd LED particle of blue light-emitting is about 3V.Like this, can according to known conduction voltage drop, determine the Control timing sequence of pwm signal, the Control timing sequence of the pwm signal in the utility model is progressively transitioned into the LED branch road of high conduction voltage drop by the LED branch road of low conduction voltage drop.First is opened signal PWM1 is ruddiness conductivity control signal, and second is opened signal PWM2 is green glow conductivity control signal, and the 3rd is opened signal PWM3 is blue light conductivity control signal.The object done like this in low conduction voltage drop transient process, causes current over pulse by high conduction voltage drop in order to preventing.
After the LED branch road of the highest conduction voltage drop has been opened, before next cycle opens minimum conduction voltage drop LED branch road, introduce a Dead Time t4, in the t4 time period, control chip turns off constant-current driven module, allows output voltage decline, at the end of t4, control chip is enable opens constant-current driven module, and constant-current driven module output current is increased to set point by 0, current over pulse when minimum conduction voltage drop can be avoided like this to open.Control chip regulates ON time t1, t2 and t3 of every paths of LEDs load, after mixed light process, can the color of free adjustment LED, colour temperature and brightness.
More than show and describe general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.Claimed scope of the present utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. a LED drive circuit, for driving LED lamp, it is characterized in that: described LED comprises the first LED particle glowed, second LED particle of green light and the 3rd LED particle of blue light-emitting, described LED drive circuit comprises control chip, constant-current driven module, first switching tube, second switch pipe and the 3rd switching tube, control chip is connected to the first switching tube by delay circuit, second switch pipe and the 3rd switching tube, described first LED particle, first switching tube and constant-current driven module are connected into a loop, described second LED particle, second switch pipe and constant-current driven module are connected into a loop, described 3rd LED particle, 3rd switching tube and constant-current driven module are connected into a loop, described control chip respectively with the control end of constant-current driven module, the control end of the first switching tube, the control end of second switch pipe and the control end electrical connection of the 3rd switching tube, described delay circuit comprises RC charge-discharge circuit unit, the first switch element and second switch unit, described first switch element comprises triode, second switch unit comprises metal-oxide-semiconductor, RC charge-discharge circuit unit is connected with power input and signal input part, the base stage of triode is connected with RC charge-discharge circuit unit with emitter, the emitter also earth terminal of triode, the collector electrode of triode is connected with the grid of metal-oxide-semiconductor, the source electrode of metal-oxide-semiconductor is connected with signal input part, and the drain electrode of metal-oxide-semiconductor is connected with signal output part.
2. a kind of LED drive circuit according to claim 1, is characterized in that: described RC charge-discharge circuit unit comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the first electric capacity C1 and the second electric capacity C2; Wherein, the first resistance R1, the first electric capacity C1 and the second electric capacity C2 form charging circuit; Second resistance R2, the 3rd resistance R3, the first electric capacity C1 and the second electric capacity C2 form discharge circuit; First switch element comprises triode Q1, and second switch unit comprises metal-oxide-semiconductor Q2.
3. a kind of LED drive circuit according to claim 1, it is characterized in that: control chip can control the size of constant-current driven module output current, thus control the brightness of LED, control chip controls the first LED particle glowed according to certain frequency, second LED particle of green light and the 3rd LED particle conducting successively of blue light-emitting, the same time only has at most a LED particle to be in conducting state, like this, electric current during each LED particle work is exactly the output current of constant-current driven module, ensure that the stable of output current, control chip regulates the ON time t1 of each LED particle, t2 and t3, after mixed light process, can the color of free adjustment LED, colour temperature and brightness.
4. a kind of LED drive circuit according to claim 1, is characterized in that: described constant-current driven module comprises DC/DC driving chip, electronic switch S, diode D, inductance L, electric capacity C1, electric capacity C2 and sampling resistor R.
5. a kind of LED drive circuit according to claim 1, is characterized in that: described control chip is single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520751438.3U CN205093002U (en) | 2015-09-27 | 2015-09-27 | LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520751438.3U CN205093002U (en) | 2015-09-27 | 2015-09-27 | LED drive circuit |
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| CN205093002U true CN205093002U (en) | 2016-03-16 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105392247A (en) * | 2015-09-27 | 2016-03-09 | 电子科技大学中山学院 | LED drive circuit |
| CN107911902A (en) * | 2017-11-30 | 2018-04-13 | 广东新昇电业科技股份有限公司 | A kind of doubleway output switch toning circuit temperature |
| CN107949113A (en) * | 2017-12-06 | 2018-04-20 | 北京小米移动软件有限公司 | LED light control circuit and LED light |
-
2015
- 2015-09-27 CN CN201520751438.3U patent/CN205093002U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105392247A (en) * | 2015-09-27 | 2016-03-09 | 电子科技大学中山学院 | LED drive circuit |
| CN107911902A (en) * | 2017-11-30 | 2018-04-13 | 广东新昇电业科技股份有限公司 | A kind of doubleway output switch toning circuit temperature |
| CN107949113A (en) * | 2017-12-06 | 2018-04-20 | 北京小米移动软件有限公司 | LED light control circuit and LED light |
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Granted publication date: 20160316 Termination date: 20160927 |