CN105407569A - Stroboscopic-effect-preventing LED power supply circuit - Google Patents
Stroboscopic-effect-preventing LED power supply circuit Download PDFInfo
- Publication number
- CN105407569A CN105407569A CN201510821713.9A CN201510821713A CN105407569A CN 105407569 A CN105407569 A CN 105407569A CN 201510821713 A CN201510821713 A CN 201510821713A CN 105407569 A CN105407569 A CN 105407569A
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- module
- power supply
- stroboscopic
- led
- supply circuits
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 4
- 238000003786 synthesis reaction Methods 0.000 abstract 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention relates to a power supply circuit and in particular to a stroboscopic-effect-preventing power supply circuit. The circuit comprises a first branch, a second branch and a waveform synthesis module, wherein the first branch is connected with the mains supply; the first branch is provided with a first alternating current/direct current conversion module; the second branch is connected with the mains supply; the second branch is provided with a waveform correction module; the waveform correction module is connected with a second alternating current/direct current conversion module; the second alternating current/direct current conversion module and the first alternating current/direct current conversion module are connected into a mains supply circuit in parallel; the waveform synthesis module is connected with the output ends of the alternating current/direct current conversion modules and the waveform synthesis module; and the output end of the waveform synthesis module is connected with an LED module. According to the stroboscopic-effect-preventing power supply circuit, the light and shade change of the LED module in use is eliminated by controlling a power supply voltage curve so as to realize the stroboscopic-effect-preventing function; and in addition, the waveform correction module is singly powered, so that the influence on the main loop is low, the power factor of the overall circuit is improved, and the useless power is lowered.
Description
Technical field
The present invention relates to a kind of power supply circuits, especially a kind of anti-stroboscopic LED power supply circuits.
Background technology
The development of LED and universal, increasing light source have employed LED and substitutes conventional light source, when LED light source works, because LED works under direct current condition, and general civil power is alternating current, so in the power supply circuits of LED, general have employed bridge rectifier to carry out the AC-DC conversion of power supply, then at the operating current of supply LED, this is existing common practice in industry, but, as shown in Figure 1, voltage curve of output due to common alternating current is the sinusoidal waveform profile be made up of positive period and negative cycle, after being changed by bridge rectifier, although the curve of negative cycle can be mirrored to positive period, form wavy curve as shown in Figure 2, but within the single cycle, the ripple amplitude drop of voltage is larger, 0 is dropped to by peak value in each cycle, when ripple amplitude drop is excessive, situation that is dark or that go out just is there will be at the lower of voltage, often not easily observe out under naked eyes, but when taking pictures under the environment at this type of light, LED light source place there will be obvious stroboscopic, cause the light source in picture to be in blink states or photo and be in comparatively dark or OFF state.
Existing common practice adds filter circuit in the power supply circuits of LED, controlled by the wavy curve of filter circuit to power supply, makes it become more mild, the LED stroboscopic problem avoiding voltage fluctuation to cause.But owing to generally comprising the device such as electric capacity, inductance in filter circuit, the circuit of such devices composition is non-pure resistance circuit, voltage and electric current can be made to produce the phase shifts of 90 °, front and back, therefore this type of circuit significantly can reduce the power factor (PF) of circuit, cause useless power to increase, the utilance of electric energy is lower.
Summary of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of anti-stroboscopic LED power supply circuits that significantly can reduce the ripple amplitude drop of voltage in the monocycle.
To achieve these goals, the present invention adopts following technical scheme:
This circuit is for being connected to for LED module provides operating current between line and the both positive and negative polarity of LED module, and it comprises:
The first branch road be electrically connected with city, is provided with the first AC-DC conversion module for providing work energy to LED module in the first described branch road;
The second branch road be electrically connected with city, the wave shape correcting module that the operating voltage of LED is controlled is provided with in the second described branch road, described wave shape correcting model calling is in the output of the second AC-DC conversion module for being separately wave shape correcting module for power supply, and the second described AC-DC conversion module and the first AC-DC conversion module are connected in line;
Waveform composition module, described Waveform composition module is connected with the output of AC-DC conversion module and Waveform composition module, and the output of Waveform composition module connects LED module.
Preferably, the first described AC-DC conversion module and the second AC-DC conversion module are respectively the first bridge rectifier and the second bridge rectifier.
Preferably, described wave shape correcting module is a RC filter circuit.
Preferably, described Waveform composition module is a NPN triode, and the output that collector electrode is connected to the output of the first bridge rectifier, base stage is connected to RC filter circuit, the emitter-base bandgap grading of described NPN triode connect LED module.
Preferably, described RC filter circuit comprises the current-limiting resistance and filter capacitor that are connected to the second bridge rectifier.
Preferably, a base stage current-limiting resistance is also provided with between the output of described volume RC filter circuit and the base stage of NPN triode.
Preferably, described filter capacitor is electrochemical capacitor.
Preferably, described line is provided with protective tube.
Owing to have employed said structure, after anti-stroboscopic LED power supply circuits of the present invention are changed civil power by rectification circuit and current rectifying and wave filtering circuit, respectively LED module is powered and supply voltage curve is controlled, make voltage curve of output smoother, thus eliminate LED module light and shade change in use, thus reach the effect of anti-stroboscopic; And wave shape correcting module is powered separately, little on the impact of major loop, improve the power factor (PF) of integrated circuit, reduce useless power.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the wavy curve figure of civil power;
Fig. 2 is the wavy curve figure of existing civil power after rectification;
The modular structure schematic diagram of Fig. 3 embodiment of the present invention;
Fig. 4 is the circuit diagram of the embodiment of the present invention;
Fig. 5 is civil power wavy curve figure after treatment in the embodiment of the present invention.
embodiment:
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, 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.
Shown in composition graphs 3, the anti-stroboscopic LED power supply circuits of the present embodiment for be connected to line and LED module 1 both positive and negative polarity between provide operating current for LED module 1, it comprises:
The first branch road be electrically connected with city, is provided with the first AC-DC conversion module 2 for providing work energy to LED module in the first described branch road;
The second branch road be electrically connected with city, the wave shape correcting module 3 that the operating voltage of LED is controlled is provided with in the second described branch road, it is the output of the second AC-DC conversion module 4 of wave shape correcting module for power supply separately that described wave shape correcting module 3 is connected to, and the second described AC-DC conversion module 4 and the first AC-DC conversion module 2 are connected in line;
Waveform composition module 5, described Waveform composition module 5 is connected with the output of the first AC-DC conversion module 2 and wave shape correcting module 3, and the output of Waveform composition module 5 connects LED module 1.
During work, in the first branch road, civil power is converted to the direct current adapted with LED module running parameter through the first AC-DC conversion module 2, in the road of second, the galvanic wave shape correcting that second AC-DC conversion module 4 exports is comparatively mild waveform through wave shape correcting module 3 by civil power after the second AC-DC conversion module 4 is converted to direct current, then galvanic for two-way waveform synthesizes by Waveform composition module 5, output services parameter and LED module adapt and the comparatively mild electric current supply of waveform to LED module, thus reach the effect of anti-stroboscopic.
Concrete, the first described AC-DC conversion module 2 and the second AC-DC conversion module 4 are respectively the first bridge rectifier BD1 and the second bridge rectifier BD2.First bridge rectifier BD1 and the second bridge rectifier BD2 is full-bridge circuit.
In the present embodiment, described wave shape correcting module 3 is a RC filter circuit.
In the present embodiment, described Waveform composition module is a NPN triode Q1, and the output that collector electrode is connected to the output of the first bridge rectifier BD1, base stage is connected to RC filter circuit, the emitter-base bandgap grading of described NPN triode connect LED module.According to the characteristic of triode, the operating current inputted by collector electrode, and the electric current of the mild waveform inputted by base stage is when emitter-base bandgap grading exports, the waveform convergence of the maintenance of its output waveform and base stage is always, and entire lowering 0.7V, 0.7V are the conducting voltage of silicone tube on voltage.
On the composition of RC filter circuit, in the present embodiment, described RC filter circuit comprises the current-limiting resistance R7 and filter capacitor EC3 that are connected to the second bridge rectifier.
In order to control the size of the electric current exported to base stage, preventing from damaging triode, in the present embodiment, between the output of described volume RC filter circuit and the base stage of NPN triode Q1, being also provided with a base stage current-limiting resistance R4.
In the present embodiment, described filter capacitor EC3 is electrochemical capacitor.
In the present embodiment, described line is provided with protective tube F1.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. anti-stroboscopic LED power supply circuits, for being connected between line and the both positive and negative polarity of LED module as LED module provides operating current, is characterized in that: comprising:
The first branch road be electrically connected with city, is provided with the first AC-DC conversion module for providing work energy to LED module in the first described branch road;
The second branch road be electrically connected with city, the wave shape correcting module that the operating voltage of LED is controlled is provided with in the second described branch road, described wave shape correcting model calling is in the output of the second AC-DC conversion module for being separately wave shape correcting module for power supply, and the second described AC-DC conversion module and the first AC-DC conversion module are connected in line;
Waveform composition module, described Waveform composition module is connected with the output of AC-DC conversion module and Waveform composition module, and the output of Waveform composition module connects LED module.
2. anti-stroboscopic LED power supply circuits as claimed in claim 1, is characterized in that: the first described AC-DC conversion module and the second AC-DC conversion module are respectively the first bridge rectifier and the second bridge rectifier.
3. anti-stroboscopic LED power supply circuits as claimed in claim 2, is characterized in that: described wave shape correcting module is a RC filter circuit.
4. anti-stroboscopic LED power supply circuits as claimed in claim 3, it is characterized in that: described Waveform composition module is a NPN triode, the output that collector electrode is connected to the output of the first bridge rectifier, base stage is connected to RC filter circuit, the emitter-base bandgap grading of described NPN triode connect LED module.
5. anti-stroboscopic LED power supply circuits as claimed in claim 4, is characterized in that: described RC filter circuit comprises the current-limiting resistance and filter capacitor that are connected to the second bridge rectifier.
6. anti-stroboscopic LED power supply circuits as claimed in claim 5, is characterized in that: be also provided with a base stage current-limiting resistance between the output of described volume RC filter circuit and the base stage of NPN triode.
7. anti-stroboscopic LED power supply circuits as claimed in claim 6, is characterized in that: described filter capacitor is electrochemical capacitor.
8. anti-stroboscopic LED power supply circuits as claimed in claim 7, is characterized in that: described line is provided with protective tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510821713.9A CN105407569B (en) | 2015-11-24 | 2015-11-24 | Anti- stroboscopic LED power supply circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510821713.9A CN105407569B (en) | 2015-11-24 | 2015-11-24 | Anti- stroboscopic LED power supply circuits |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105407569A true CN105407569A (en) | 2016-03-16 |
| CN105407569B CN105407569B (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510821713.9A Expired - Fee Related CN105407569B (en) | 2015-11-24 | 2015-11-24 | Anti- stroboscopic LED power supply circuits |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202118704U (en) * | 2011-06-15 | 2012-01-18 | 浙江丽得电器有限公司 | Footlight |
| US20140184093A1 (en) * | 2012-12-28 | 2014-07-03 | Samsung Electro-Mechanics Co., Ltd. | Single stage forward-flyback converter and power supply apparatus for light emitting diode |
| CN204795697U (en) * | 2015-05-20 | 2015-11-18 | 深圳市朗科智能电气股份有限公司 | No ripple led lamp power supply circuit |
| CN205213114U (en) * | 2015-11-24 | 2016-05-04 | 肖志蓝 | Prevent stroboscopic LED supply circuit |
-
2015
- 2015-11-24 CN CN201510821713.9A patent/CN105407569B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202118704U (en) * | 2011-06-15 | 2012-01-18 | 浙江丽得电器有限公司 | Footlight |
| US20140184093A1 (en) * | 2012-12-28 | 2014-07-03 | Samsung Electro-Mechanics Co., Ltd. | Single stage forward-flyback converter and power supply apparatus for light emitting diode |
| CN204795697U (en) * | 2015-05-20 | 2015-11-18 | 深圳市朗科智能电气股份有限公司 | No ripple led lamp power supply circuit |
| CN205213114U (en) * | 2015-11-24 | 2016-05-04 | 肖志蓝 | Prevent stroboscopic LED supply circuit |
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| Publication number | Publication date |
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| CN105407569B (en) | 2017-05-31 |
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Address after: 528000 Guangdong city of Foshan province stone core area of Nanhai Danzao Nanhai national eco Industrial Park Road No. 8 building a Patentee after: Xiao Zhilan Address before: 528251, Guangdong, Foshan Province Nanhai District, Ping Chau Industrial Park victory road, Foshan Debao Lighting Co., Ltd. Patentee before: Xiao Zhilan |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20170531 Termination date: 20191124 |