CN202435690U - Flicker-prevention LED (light-emitting diode) pulse width modulation control circuit - Google Patents
Flicker-prevention LED (light-emitting diode) pulse width modulation control circuit Download PDFInfo
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- CN202435690U CN202435690U CN2012200497909U CN201220049790U CN202435690U CN 202435690 U CN202435690 U CN 202435690U CN 2012200497909 U CN2012200497909 U CN 2012200497909U CN 201220049790 U CN201220049790 U CN 201220049790U CN 202435690 U CN202435690 U CN 202435690U
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- led
- flicker
- control circuit
- width modulation
- diode
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Abstract
The utility model discloses a flicker-prevention LED (light-emitting diode) pulse width modulation control circuit, which comprises an inductor and a diode, wherein the inductor is connected with the LED in series; and the diode is connected at the two ends of each of the LED and the inductor in parallel. The circuit also comprises a capacitor which is connected at the two ends of the LED in parallel. The flicker-prevention LED pulse width modulation control circuit can be used for suppressing and eliminating the flicker phenomenon of the LED by using the PWM (Pulse-Width Modulation) control mode; the illumination requirements on photograph and other fields are met; thereby promoting the popularization of the LED in such fields.
Description
Technical field
The utility model relates to LED control technology field, is specifically related to a kind of LED control circuit for pulse-width modulation of anti-flicker.
Background technology
Existing led drive circuit carries out brightness regulation if desired, generally is to adopt PWM (pulsewidth debugging) control mode, promptly is employed in the time control brightness of switch in a period of time.And existing led drive circuit is generally all pursued cost and efficient, and the rare flicker inhibition scheme of mentioning.In the existing LED brightness regulation scheme, adopt the PWM mode to carry out brightness regulation greatly, and PWM adjusting brightness can realize quick, efficient and less thermal losses.But because PWM adopts the time that turns on and off that brightness is regulated, LED is actually at the frequency scintillation to be exceedingly fast.Though general PWM control frequency all more than 100Hz, can't discover, and then is fatal for fields such as photographies by people's naked eyes.This has just limited the popularization of LED in these fields.
The utility model content
The purpose of the utility model is to provide a kind of LED control circuit for pulse-width modulation of anti-flicker, can under the prerequisite of using the PWM control mode, suppress, eliminate the scintillation of LED.
For reaching the foregoing invention purpose, the technical scheme that the utility model adopted is: a kind of LED control circuit for pulse-width modulation of anti-flicker is provided, has it is characterized in that: comprise inductance and diode; Said inductance and LED are cascaded, and diode is connected in parallel on LED and inductance two ends.
LED control circuit for pulse-width modulation like the described anti-flicker of the utility model is characterized in that: also comprise electric capacity, said electric capacity is parallel to the LED two ends.
LED control circuit for pulse-width modulation like the described anti-flicker of the utility model is characterized in that: described diode is a fly-wheel diode.
LED control circuit for pulse-width modulation like the described anti-flicker of the utility model is characterized in that: said fly-wheel diode is a fast recovery diode.
The LED control circuit for pulse-width modulation of the anti-flicker that the utility model provided can suppress, eliminate the scintillation of LED under the prerequisite of using the PWM control mode, satisfied the illumination needs in fields such as photography, has promoted the popularization of LED in these fields.
Description of drawings
Fig. 1 is the electrical schematic diagram of this control circuit;
Fig. 2 is the current waveform figure of LED when not using this control circuit;
Fig. 3 is the current waveform figure a when series inductance and parallel diode in this control circuit;
Fig. 4 for this control circuit add the parallel connection electric capacity after current waveform figure.
Wherein, 1, LED; 2, diode; 3, inductance; 4, electric capacity; 5, switching tube.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the utility model is done and to be described in detail:
As shown in Figure 1, in the LED1 drive circuit, three LED1 that are cascaded are arranged, inductance 3 and three LED1 are cascaded, and diode 2 is connected in parallel on the LED1 and inductance 3 two ends of series connection.
During circuit working, when pwm signal control switch pipe 5 was opened, electric current flow through the LED1 and the switching tube 5 of inductance 3, series connection, and inductance 3 suppresses electric current in this process increase and energy storage.When pwm signal control switch pipe 5 turn-offed, electric current flow through the LED 1 and the diode 2 of inductance 3, series connection, and inductance 3 suppresses electric current and reduces also exoergic in this process, thereby the square wave current (as shown in Figure 2) of PWM control is converted into triangular wave (as shown in Figure 3).In two processes, all there is electric current to flow through LED1, thereby suppressed the flicker of LED1.
Owing in the charge and discharge process change in current is arranged still, so having light and shade, LED1 changes, therefore can an electric capacity 4 be parallel to the LED1 two ends of series connection, further reduce ripple current (as shown in Figure 4).
Described switching tube 5 comprises triode, thyristor, Darlington transistor or controllable silicon, also can adopt switch control devices such as integrated drive chips.
Described diode 2 is a fly-wheel diode, preferentially selects fast recovery diode for use, like Schottky diode; Replacements such as also available rectifier diode pipe, switching diode.
The number of LED can optionally be adjusted in the described circuit, like one or more when above (one for series connection).
The basic structure of the above control circuit also comprises with it and adopts dual structure but the circuit of same principle.
Operation principle:
This control circuit is the energy storage characteristic that utilizes inductance 3, when switching tube 5 is opened, suppresses the instantaneous increase of electric current, simultaneously store electrical energy.When switching tube 5 turn-offed, the moment of suppressing electric current reduced, and discharges electric energy simultaneously.And diode 2, then when switching tube 5 turn-offs, for inductance 3 provides discharge loop.Switching tube 5 is open-minded, and during inductance 3 chargings, diode 2 turn-offs.When inductance 3 charging, discharge, electric current all from LED1 flow through and direction constant.Thereby the electric current that flows through LED 1 is become continuously by being interrupted, thereby suppress the flicker of LED1.
Electric capacity 4 is stored when switching tube 5 switches and is released energy, and further reduces the ripple current that flows through LED1, thereby suppresses bright, the dark variation of LED1.
Said diode 2 comprises that all are the device that inductance 3 provides discharge loop when switching device turn-offs.Described inductance 3 comprise promising LED 1 electric current that will flow through convert continuous energy storage inductor element into by being interrupted.
Like Fig. 2, Fig. 3, shown in Figure 4, to compare with general led drive circuit, the electric current that this control circuit will be interrupted transforms into continuous electric current, thereby has suppressed the scintillation of LED1 when the PWM brightness regulation.Make it to be applied to similar photography and so on to the highstrung application of light source scintillation.
The utility model is not limited to above-mentioned instance, in claims institute restricted portion of the utility model, and various distortion that those skilled in the art can make without creative work or revise the protection that all receives this patent.
Claims (4)
1. the LED control circuit for pulse-width modulation of an anti-flicker is characterized in that: comprise inductance (3) and diode (2); Said inductance (3) is cascaded with LED (1), and diode (2) is connected in parallel on LED (1) and inductance (3) two ends.
2. the LED control circuit for pulse-width modulation of anti-flicker as claimed in claim 1, it is characterized in that: also comprise electric capacity (4), said electric capacity (4) is parallel to LED (1) two ends.
3. according to claim 1 or claim 2 the LED control circuit for pulse-width modulation of anti-flicker, it is characterized in that: described diode (2) is a fly-wheel diode.
4. the LED control circuit for pulse-width modulation of anti-flicker as claimed in claim 3, it is characterized in that: said fly-wheel diode is a fast recovery diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200497909U CN202435690U (en) | 2012-02-16 | 2012-02-16 | Flicker-prevention LED (light-emitting diode) pulse width modulation control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200497909U CN202435690U (en) | 2012-02-16 | 2012-02-16 | Flicker-prevention LED (light-emitting diode) pulse width modulation control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202435690U true CN202435690U (en) | 2012-09-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200497909U Expired - Fee Related CN202435690U (en) | 2012-02-16 | 2012-02-16 | Flicker-prevention LED (light-emitting diode) pulse width modulation control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202435690U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ305489B6 (en) * | 2013-04-22 | 2015-10-29 | Varroc Lighting Systems, s.r.o. | Pulse-switched controller for LED lighting of LED power supply module of lighting fixtures in automobile applications provided light sources with LED and power supply module of LED function and excitation |
| US10074299B2 (en) | 2015-07-28 | 2018-09-11 | Microsoft Technology Licensing, Llc | Pulse width modulation for a head-mounted display device display illumination system |
| CN109166509A (en) * | 2018-09-20 | 2019-01-08 | 珠海格力电器股份有限公司 | Control circuit, temperature controller, equipment and the method and apparatus for adjusting display color |
-
2012
- 2012-02-16 CN CN2012200497909U patent/CN202435690U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ305489B6 (en) * | 2013-04-22 | 2015-10-29 | Varroc Lighting Systems, s.r.o. | Pulse-switched controller for LED lighting of LED power supply module of lighting fixtures in automobile applications provided light sources with LED and power supply module of LED function and excitation |
| US9338842B2 (en) | 2013-04-22 | 2016-05-10 | Varroc Lighting Systems, s.r.o. | Pulse switched resistor driver |
| US10074299B2 (en) | 2015-07-28 | 2018-09-11 | Microsoft Technology Licensing, Llc | Pulse width modulation for a head-mounted display device display illumination system |
| CN109166509A (en) * | 2018-09-20 | 2019-01-08 | 珠海格力电器股份有限公司 | Control circuit, temperature controller, equipment and the method and apparatus for adjusting display color |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120912 Termination date: 20170216 |