CN105392247A - LED drive circuit - Google Patents
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- CN105392247A CN105392247A CN201510620556.5A CN201510620556A CN105392247A CN 105392247 A CN105392247 A CN 105392247A CN 201510620556 A CN201510620556 A CN 201510620556A CN 105392247 A CN105392247 A CN 105392247A
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Abstract
The invention provides an LED driving circuit which is used for driving an LED lamp, wherein the LED lamp comprises first LED particles emitting red light, second LED particles emitting green light and third LED particles emitting blue light, the LED driving circuit comprises a control chip, a constant current driving module, a first switch tube, a second switch tube and a third switch tube, and the control chip is connected with the first switch tube, the second switch tube and the third switch tube through a delay circuit. The LED driving circuit overcomes the technical problems that the current of the LED is controlled to be constant by adopting a resistance current-limiting mode, the control effect is poor and the power consumption is increased in the existing LED driving circuit capable of adjusting the brightness, the color temperature and the color of the LED, and meanwhile, the LED driving circuit can control the working states of different LED particles according to the brightness, the color temperature and the color requirements set by a user, achieves the set effect, is stable in output current, does not have current overshoot, and reduces the extra power consumption.
Description
Technical field
The present invention relates to LED Driving technique field, be 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 invention 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.
Summary of the invention
Technical problem solved by the invention is to provide a kind of LED drive circuit, to solve the problem in above-mentioned background technology.
Technical problem solved by the invention 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 present invention: the LED drive circuit that the present invention 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 present invention 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 invention;
Fig. 2 is the circuit theory diagrams of constant-current driven module of the present invention;
Fig. 3 is the control signal sequential chart that control chip of the present invention exports;
Fig. 4 is the circuit theory diagrams of delay control circuit of the present invention;
Fig. 5 is RC charge-discharge circuit element circuit figure of the present invention;
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 invention, creation characteristic, workflow, using method, below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, a kind of LED drive circuit of the present invention, 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 invention, 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 present invention 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 invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
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, 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.
3. a kind of LED drive circuit according to claim 1, is characterized in that: 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.
4. a kind of LED drive circuit according to claim 1, it 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, 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.
5. a kind of LED drive circuit according to claim 1, is characterized in that: described control chip is single-chip microcomputer.
6. 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.
7. the driving method of a kind of LED drive circuit according to claim 6, is characterized in that: described operating frequency f >=200HZ.
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| CN201510620556.5A CN105392247A (en) | 2015-09-27 | 2015-09-27 | LED drive circuit |
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| CN201510620556.5A CN105392247A (en) | 2015-09-27 | 2015-09-27 | LED drive circuit |
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| CN105392247A true CN105392247A (en) | 2016-03-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018113399A1 (en) * | 2016-12-20 | 2018-06-28 | 欧普照明股份有限公司 | Light source module |
| CN108966424A (en) * | 2018-08-14 | 2018-12-07 | 湖南品胜生物技术有限公司 | A kind of control method of microscope light source |
| CN111599644A (en) * | 2019-02-20 | 2020-08-28 | 珠海恒途电子有限公司 | Controller |
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| CN104066237A (en) * | 2014-05-09 | 2014-09-24 | 浙江凯耀智能照明科技有限公司 | LED driving circuit and driving method |
| US20140292217A1 (en) * | 2012-08-06 | 2014-10-02 | Merlot Laboratories Inc. | Dimming system of lamp using light-emitting device |
| CN104796120A (en) * | 2015-03-26 | 2015-07-22 | 蒋丽 | Time delay circuit |
| CN205093002U (en) * | 2015-09-27 | 2016-03-16 | 电子科技大学中山学院 | LED drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20140292217A1 (en) * | 2012-08-06 | 2014-10-02 | Merlot Laboratories Inc. | Dimming system of lamp using light-emitting device |
| CN104066237A (en) * | 2014-05-09 | 2014-09-24 | 浙江凯耀智能照明科技有限公司 | LED driving circuit and driving method |
| CN104796120A (en) * | 2015-03-26 | 2015-07-22 | 蒋丽 | Time delay circuit |
| CN205093002U (en) * | 2015-09-27 | 2016-03-16 | 电子科技大学中山学院 | LED drive circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018113399A1 (en) * | 2016-12-20 | 2018-06-28 | 欧普照明股份有限公司 | Light source module |
| CN108966424A (en) * | 2018-08-14 | 2018-12-07 | 湖南品胜生物技术有限公司 | A kind of control method of microscope light source |
| CN111599644A (en) * | 2019-02-20 | 2020-08-28 | 珠海恒途电子有限公司 | Controller |
| CN111599644B (en) * | 2019-02-20 | 2022-06-17 | 珠海恒途电子有限公司 | Controller |
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Application publication date: 20160309 |