CN203504846U - LED intelligent constant current light modulator - Google Patents
LED intelligent constant current light modulator Download PDFInfo
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- CN203504846U CN203504846U CN201320651055.XU CN201320651055U CN203504846U CN 203504846 U CN203504846 U CN 203504846U CN 201320651055 U CN201320651055 U CN 201320651055U CN 203504846 U CN203504846 U CN 203504846U
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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 utility model provides an LED intelligent constant current light modulator comprising an LED lamp; a controller used for setting a current setting value of the LED lamp; a micro-control unit, which is connected with the controller, and can be used to adjust the current across the LED lamp according to the current setting value set by the controller and the current current value of the LED lamp; a driving circuit, which is connected with the micro-control unit, and can be used to drive a constant current conversion circuit under the control of the micro-control unit; and the constant current conversion circuit, which is connected between the driving circuit and the LED lamp to realize the energy storage and the freewheeling of the constant current. A current detection circuit is respectively connected with the LED lamp and the micro-control unit to detect the current current value of the LED lamp in a real-time manner, and then the detected current value can be output to the micro-control unit. The light modulator is advantageous in that the output voltage range can be widened, the constant current accuracy can be improved, the light modulation error can be reduced, and the current modification can be facilitated.
Description
Technical field
The utility model relates to the control device of LED light fixture, is specifically related to a kind of LED constant-current dimmer.
Background technology
LED light fixture progressively enters household electrical appliances illuminating industry at present, and the demand of LED constant-current dimmer constantly expands.Inventor finds that conventional LED constant-current dimmer in use can be subject to some restrictions, mainly contains following shortcoming:
1, the voltage range of output is narrow, and the domain of walker of the output voltage of traditional dimmer is generally 30%;
2, traditional constant-current dimmer constant current accuracy is generally 3%, and error 30mA for the light fixture of 1000mA cannot meet the occasion of some high requests;
3, the dimming curve of traditional constant-current dimmer cannot change, and in the occasion of digital dimming, uses, and error is large, and dimming curve is non-linear;
4, traditional constant-current dimmer output current is fixed, if revise electric current, need to revise hardware.
Utility model content
The purpose of this utility model is, overcomes the above-mentioned deficiency of prior art, and a kind of LED Intelligent constant flow dimmer is provided, widening output voltage range, improve constant current accuracy, reduce light modulation error, to make to revise electric current convenient.
For reaching above-mentioned purpose, the utility model provides a kind of LED Intelligent constant flow dimmer, comprising:
LED lamp;
Controller, for arranging the current setting value of LED lamp;
Micro-control unit, is connected with described controller, for regulate the electric current of described LED lamp according to the current current value of the current setting value of described controller setting and LED lamp;
Drive circuit, is connected with described micro-control unit, for drive constant current change-over circuit under the control of described micro-control unit;
Constant current change-over circuit, is connected between described drive circuit and described LED lamp, for realizing the required energy storage of constant current and afterflow;
Current detection circuit, is connected with described micro-control unit with described LED lamp respectively, for detecting in real time the current current value of described LED lamp, and exports to described micro-control unit.
Further, described LED Intelligent constant flow dimmer also comprises: give the first power module of described micro-control unit power supply, and the second source module of giving described LED lamp power supply.
Further, described constant current change-over circuit comprises: MOS-FET, diode and inductor module; Described inductor module one end connects described LED lamp, and the other end connects the drain electrode of described MOS-FET; The grid of described MOS-FET is connected with described drive circuit, and the source electrode of described MOS-FET is connected with described second source module, and the drain electrode of described MOS-FET is also connected with the negative pole of described diode, the plus earth of described diode.
Further, described drive circuit is P channel MOS-FET drive circuit.
Further, described the first power module and described second source module are AC-DC power module.
Compare with traditional dimmer, the LED Intelligent constant flow dimmer tool of the utility model embodiment has the following advantages:
1, the voltage range of traditional dimmers output is narrow, and the domain of walker of the output voltage of traditional dimmer is generally 30%, and this novel output voltage range can be realized 90% float, and range of application is wider;
2, traditional constant-current dimmer constant current accuracy is generally 3%, error 30mA for the light fixture of 1000mA, and this novel output can realize 1% constant current accuracy, can meet the occasion of some high requests;
3, the dimming curve of traditional constant-current dimmer cannot change, and in the occasion of digital dimming, uses, and error is large, and dimming curve is non-linear; This novel dimming curve can arrange flexibly, facilitates client to proofread and correct;
4, traditional constant-current dimmer output current is fixed, if revise electric current, need to revise hardware; Basis is novel can revise electric current by PC, and electric current is variable arbitrarily.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, by the accompanying drawing of required use in embodiment or description of the Prior Art being done to one, introduce simply below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the allomeric function block diagram of a kind of LED Intelligent constant flow dimmer of the utility model embodiment;
Fig. 2 is that a kind of LED Intelligent constant flow dimmer of the utility model embodiment is realized the control loop schematic diagram of light modulation by negative feedback control;
Fig. 3 is that a kind of LED Intelligent constant flow dimmer of the utility model embodiment is as a practical circuit diagram of giving an example.
In figure:
Embodiment
For making object, technical scheme and the advantage of the utility model embodiment clearer, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, the LED Intelligent constant flow dimmer of the utility model embodiment mainly comprises:
Controller 1(is computer for example), micro-control unit 2, the first power module 31 and second source module 32(are preferably two AC-DC power modules), drive circuit 4(is preferably P channel MOS-FET drive circuit), constant current change-over circuit 5(preferably comprises MOS-FET, diode D1, inductor module L2), as the LED lamp 6 of load blocks, and current detection circuit 7.
Wherein, controller 1 can for computer, for the electric current of LED is set, specifically for the current setting value in LED lamp 6 is set.Micro-control unit 2 is control cores of this LED Intelligent constant flow dimmer, for the treatment of the order of controller 1 and the electric current in control LED, to realize constant flow regulation.Two AC-DC power modules are to be respectively used to the first power module 31 of micro-control unit 2 power supplies with for the second source module 32 to 6 power supplies of LED lamp.Drive circuit 4 is the drive circuits as P channel MOS-FET.Constant current change-over circuit 5, is connected between this drive circuit 4 and LED lamp 6, for realizing the required energy storage of constant current and afterflow; This constant current change-over circuit 5 preferably comprise MOS-FET(its to have first end be grid, the second end for drain electrode and the 3rd end be source electrode), diode D1, inductor module L2, this inductor module L2 one end connects LED lamp 6, the other end connects the drain electrode of MOS-FET; The grid of this MOS-FET is connected with this drive circuit 4, and the source electrode of this MOS-FET is connected with second source 32 modules, and the drain electrode of this MOS-FET is also connected with the negative pole of diode D1, the plus earth of this diode D1.Current detection circuit 7, is connected with micro-control unit 2 with this LED lamp 6, for detection of the electric current in LED lamp 6, exports to micro-control unit 2.In the utility model embodiment, adopt resistance to convert current signal to voltage signal, and give micro-control unit after using operational amplifier that voltage signal is amplified.
Particularly, these constant current change-over circuit 5 courses of work can be divided into following 2 stages:
1), in the time of MOS-FET conducting, it is upper that VBUS voltage is added in inductance L 2 and LED load (being LED lamp 6), the electric current in inductance L 2 can increase gradually, inductance L 2 stored energys are closed MOS-FET after the upper limit is set and are got the hang of two when electric current reaches;
2), in state two, inductance L 2, diode D1, and LED load (being LED lamp 6) forms a loop.Inductance L 2 starts to release energy, and electric current is back to inductance L 2 from diode D1, and electric current constantly reduces, and when below being reduced to set point time, opens MOS-FET, gets back to state 1.
The course of work or the principle of this LED Intelligent constant flow dimmer are below described:
By computer setting, flow through in the present embodiment the electric current of LED lamp 6, to realize the brightness that regulates LED lamp 6, the larger brightness of electric current is larger, otherwise brightness is darker;
When micro-control unit 2 receives after the order that electric current is set, by micro-control unit 2, P channel MOS-FET drive circuit, constant current change-over circuit 5(MOS-FET, diode, inductor module), LED lamp 6, the feedback loop that current detection circuit 7 forms progressively regulates electric current, until the electric current of LED lamp with electric current be set equate.Control loop refers to Fig. 2.
As shown in Figure 2, control loop operation principle is as follows:
1), micro-control unit is in the time of work, relatively the current signal of current detection circuit 7 outputs, when this current signal is less than after set point, starts to increase the ON time of MOS-FET, electric current in LED can increase, and the current signal of current detection circuit 7 outputs can increase.
2), when micro-control unit detects current signal, be greater than after set point, can reduce the ON time of MOS-FET, the electric current in LED can reduce, and the current signal of current detection circuit 7 outputs can reduce.
3), LED Intelligent constant flow dimmer is realized the constant of electric current by 2 kinds of negative feedback states above.
Fig. 3 is that a kind of LED Intelligent constant flow dimmer of the utility model embodiment is as a practical circuit diagram of giving an example.Further, in conjunction with Fig. 3, concrete structure and the working method of this LED Intelligent constant flow dimmer described as follows:
Circuit framework as shown in Figure 3, adopts step-down frame design, and main devices has 1 P channel MOS-FET, sustained diode 6, inductance L 4, current sampling resistor (R8 R83 in parallel), operational amplifier, and single-chip microcomputer.The built-in comparator of single-chip microcomputer, ADC, PWM and serial port module (as UART).
Working method is as follows: computer expert crosses serial ports and communicates by letter with this LED Intelligent constant flow dimmer, for output current size, controls.Micro-control unit obtains after current value, and the output of DAC is set, and reference current IREF arrives the negative input end of internal comparator, and starts PWM, opens P-MOS.Power supply opening, gives inductance L 4 chargings, and the electric current in LED slowly increases, and when detection current IS ENSED increases to IREF, micro-control unit (being single-chip microcomputer) internal arithmetic amplifier output HIGH voltage, controls and close PWM output, and MOS-FET closes.Now the electric current due to inductance L 4 can not suddenly change, and by sustained diode 6, works on, and electric current starts to decline, in the time of under induced current drops to IREF, and output PWM, then open MOS-FET and form a new circulation.By this feedback loop, dynamically adjust electric current, electric current is maintained in default value.
Compare with traditional dimmer, the LED Intelligent constant flow dimmer tool of the utility model embodiment has the following advantages:
1, the voltage range of traditional dimmers output is narrow, and the domain of walker of the output voltage of traditional dimmer is generally 30%, and this novel output voltage range can be realized 90% float, and range of application is wider;
2, traditional constant-current dimmer constant current accuracy is generally 3%, error 30mA for the light fixture of 1000mA, and this novel output can realize 1% constant current accuracy, can meet the occasion of some high requests;
3, the dimming curve of traditional constant-current dimmer cannot change, and in the occasion of digital dimming, uses, and error is large, and dimming curve is non-linear; This novel dimming curve can arrange flexibly, facilitates client to proofread and correct;
4, traditional constant-current dimmer output current is fixed, if revise electric current, need to revise hardware; Basis is novel can revise electric current by PC, and electric current is variable arbitrarily.
Above embodiment only, in order to the technical scheme of the utility model embodiment to be described, is not intended to limit; Although the utility model embodiment is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model embodiment.
Claims (5)
1. a LED Intelligent constant flow dimmer, is characterized in that, comprising:
LED lamp;
Controller, for arranging the current setting value of LED lamp;
Micro-control unit, is connected with described controller, for regulate the electric current of described LED lamp according to the current current value of the current setting value of described controller setting and LED lamp;
Drive circuit, is connected with described micro-control unit, for drive constant current change-over circuit under the control of described micro-control unit;
Constant current change-over circuit, is connected between described drive circuit and described LED lamp, for realizing the required energy storage of constant current and afterflow;
Current detection circuit, is connected with described micro-control unit with described LED lamp respectively, for detecting in real time the current current value of described LED lamp, and exports to described micro-control unit.
2. LED Intelligent constant flow dimmer according to claim 1, is characterized in that, also comprises: give the first power module of described micro-control unit power supply, and the second source module of giving described LED lamp power supply.
3. LED Intelligent constant flow dimmer according to claim 2, is characterized in that, described constant current change-over circuit comprises: MOS-FET, diode and inductor module; Described inductor module one end connects described LED lamp, and the other end connects the drain electrode of described MOS-FET; The grid of described MOS-FET is connected with described drive circuit, and the source electrode of described MOS-FET is connected with described second source module, and the drain electrode of described MOS-FET is also connected with the negative pole of described diode, the plus earth of described diode.
4. according to the LED Intelligent constant flow dimmer described in claim 1 or 3, it is characterized in that, described drive circuit is P channel MOS-FET drive circuit.
5. LED Intelligent constant flow dimmer according to claim 2, is characterized in that, described the first power module and described second source module are AC-DC power module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320651055.XU CN203504846U (en) | 2014-02-07 | 2014-02-07 | LED intelligent constant current light modulator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320651055.XU CN203504846U (en) | 2014-02-07 | 2014-02-07 | LED intelligent constant current light modulator |
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| CN203504846U true CN203504846U (en) | 2014-03-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104411042A (en) * | 2014-11-19 | 2015-03-11 | 西安重装渭南光电科技有限公司 | LED (light emitting diode) drive device |
| CN108566189A (en) * | 2018-05-03 | 2018-09-21 | 王汉禄 | Touch solid-state switch |
-
2014
- 2014-02-07 CN CN201320651055.XU patent/CN203504846U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104411042A (en) * | 2014-11-19 | 2015-03-11 | 西安重装渭南光电科技有限公司 | LED (light emitting diode) drive device |
| CN107046750A (en) * | 2014-11-19 | 2017-08-15 | 姜敏敏 | Using LED drive device of the PWM mode to light fixture stepless dimming |
| CN107046750B (en) * | 2014-11-19 | 2018-11-09 | 扬州绿安新节能照明科技有限公司 | Using PWM mode to the LED drive device of lamps and lanterns stepless dimming |
| CN108566189A (en) * | 2018-05-03 | 2018-09-21 | 王汉禄 | Touch solid-state switch |
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