CN201904960U - LED drive circuit capable of improving quality of LED drive circuit - Google Patents
LED drive circuit capable of improving quality of LED drive circuit Download PDFInfo
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- CN201904960U CN201904960U CN201020685904XU CN201020685904U CN201904960U CN 201904960 U CN201904960 U CN 201904960U CN 201020685904X U CN201020685904X U CN 201020685904XU CN 201020685904 U CN201020685904 U CN 201020685904U CN 201904960 U CN201904960 U CN 201904960U
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Abstract
The utility model discloses an LED drive circuit capable of improving the quality of an LED drive circuit, which comprises a full-wave rectifier circuit, wherein the full-wave rectifier circuit is connected with an active filter circuit formed in the way of taking a CRD (current regulator diode) as the main body; the active filter circuit formed in the way of taking the CRD (current regulator diode) as the main body comprises a Pi-type filter circuit composed of a current regulator diode CRD2, a capacitor C1 and a capacitor C2; and the input terminal of the Pi-type filter circuit is connected with the positive electrode of the full-wave rectifier circuit through a current regulator diode CRD1, and the output terminal of the Pi-type filter circuit is connected with an LED lamp through a current regulator diode CRD3. The LED drive circuit has the advantages that the circuit is simple, a 220V (110V) /50 Hz/60 Hz mains supply directly provides power, the light emission of the LED is more stable, the service life of the LED is prolonged, and the defects of low power factor, low driving efficiency, difficultly controlled error of constant current and complex circuit structure in the prior art are avoided.
Description
Technical field
The utility model relates to a kind of led drive circuit that improves the led drive circuit quality, belongs to the applied technical field of novel current regulator diode.
Background technology
Present led drive circuit generally is to power by the DC power supply of variety of way, and all mains supply modes all need current rectifying and wave filtering circuit.Because phase shift that current rectifying and wave filtering circuit produces and current waveform distortion cause power factor to descend; Capacitorless filtering, perhaps adopt existing reactive power compensation circuit, though can improve power factor, but the output voltage that provides (electric current) ripple is very big, ripple coefficient reaches 50%--70%, these ripples are low-frequency ripple (50HZs-100HZ), be difficult to little electric capacity filtering the same with ac power frequency.Output voltage ripple is excessive, and load and late-class circuit are produced harmful effect.
Summary of the invention
The purpose of this utility model is, provide a kind of power factor (PF) that can improve led drive circuit and current precision, and the led drive circuit of raising led drive circuit quality that can reduce the ripple coefficient of led drive circuit and can improve the overall qualities of led drive circuit, to remedy the deficiency of current led drive circuit.
The technical solution of the utility model: a kind of led drive circuit that improves the led drive circuit quality of the present utility model, comprise full-wave rectifying circuit, full-wave rectifying circuit be that the active filter circuit that main body constitutes is connected by the CRD current regulator diode.
In the aforesaid led drive circuit, described is that active filter circuit that main body constitutes comprises the π type filter circuit that is made of current regulator diode CRD2 and capacitor C 1 and capacitor C 2 by the CRD current regulator diode; The input of π type filter circuit is connected with the positive pole of full-wave rectifying circuit through current regulator diode CRD1, and the output of π type filter circuit is connected with LED light fixture group through current regulator diode CRD3.
In the aforesaid led drive circuit, described is that the active filter circuit that main body constitutes comprises the T type filter circuit that is made of current regulator diode CRD4, current regulator diode CRD4 and capacitor C 3 by the CRD current regulator diode; Current regulator diode CRD4 in the T type filter circuit is anodal to be connected with the positive pole of full-wave rectifying circuit, and the current regulator diode CRD5 negative pole in the T type filter circuit is connected with LED light fixture group.
In the aforesaid led drive circuit, the ac input end of described full-wave rectifying circuit and voltage are 110V or 220V, and frequency is that the AC power of 50HZ or 60HZ connects.
Compared with prior art, the CRD current regulator diode that the utility model is used Guizhou YUNI Electronics ﹠ Technology Co., Ltd.'s production is a main body, constitute π shape filter circuit or T shape filter circuit with low capacity electric capacity, the power factor (PF) of led drive circuit is increased to more than 90% by traditional 70～80%, the current precision error of led drive circuit is increased to 5～6% by traditional 10%, the ripple coefficient of led drive circuit is reduced to below 0.5% by traditional 50%--70%.Improve the overall qualities of led drive circuit.The utility model circuit is simple, directly by 220V voltage or 110V voltage, frequency is the mains-supplied of 50HZ or 60HZ, can make the LED luminous tube luminous more stable, prolong the useful life of LED luminous tube, to overcome the deficiency that the power factor that prior art exists is low, drive problems such as efficient is low, the difficult control of constant current error, circuit structure complexity.
Can be by following experiment confirm the beneficial effects of the utility model.
Experimental circuit as shown in Figure 1, the voltage of power supply is respectively normal voltage 220V, be higher than three groups of the voltage 260V of standard and substandard voltage 180V, supply frequency is 50HZ, the rated voltage of LED light fixture group is 220V.
Experimental result is as follows, and when supply power voltage was 220V, the actual current that records LED light fixture group was 20 milliamperes;
When supply power voltage was 260V, the actual current that records LED light fixture group was 21 milliamperes;
When supply power voltage was 260V, the actual current that records LED light fixture group was 19.8 milliamperes.
Conclusion is: when the fluctuation range of voltage is 20%, have only (21-19.8) ÷ 21=5.7% by the current fluctuation scope of LED light fixture group.Has good current stability.
Description of drawings
Fig. 1 is electrical schematic diagram of the present utility model (filtering of π shape):
Fig. 2 is electrical schematic diagram of the present utility model (filtering of T shape);
Fig. 3 is a critical piece current regulator diode performance diagram of the present utility model;
Fig. 4 is the experimental curve diagram of the utility model when being powered by 260V;
Fig. 5 is the experimental curve diagram of the utility model when being powered by 220V;
Fig. 6 is the experimental curve diagram of the utility model when being powered by 180V.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples, but not as to any restriction of the present utility model.
Embodiment: electrical principle of the present utility model as depicted in figs. 1 and 2, the method for the raising led drive circuit quality that the utility model adopted is to improve the quality of led drive circuit as the filter circuit of led drive circuit by the active filter circuit that two end constant current devices constitute.Described two end constant current devices adopt the CRD current regulator diode.Fig. 3 is the characteristic curve of CRD current regulator diode, and as seen from Figure 3, current regulator diode belongs to the two ends constant current device.Have a constant current district during forward work, electric current I does not change with V in this zone; Its reverse operation characteristic then has similarity with the reverse characteristic of general-purpose diode.When the voltage at current regulator diode two ends changed between VS and VE, the electric current by current regulator diode did not change, thereby had guaranteed the current stabilization by LED light fixture group.Can prolong the useful life of LED light fixture group, guarantee the job stability of LED light fixture group, the luminous light that goes out does not glimmer.
Described active filter circuit constitutes π shape filter circuit based on the CRD current regulator diode with low capacity electric capacity.Described low capacity electric capacity is meant that used capacitance is 0.2～0.1 times of used capacitance in conventional AC power rectifier RC filter circuit or the LC filter circuit.The quality of described led drive circuit comprises that raising LED driving power is to the power factor (PF) of electrical network, the ripple coefficient that reduces led drive circuit and raising current precision.
The of the present utility model a kind of led drive circuit structure that improves the led drive circuit quality that makes up according to the method described above comprises full-wave rectifying circuit as shown in Figure 1, full-wave rectifying circuit be that the active filter circuit that main body constitutes is connected by the CRD current regulator diode.Described is that active filter circuit that main body constitutes comprises the π type filter circuit that is made of current regulator diode CRD2 and capacitor C 1 and capacitor C 2 by the CRD current regulator diode; The input of π type filter circuit is connected with the positive pole of full-wave rectifying circuit through current regulator diode CRD1, and the output of π type filter circuit is connected with LED light fixture group through current regulator diode CRD3.
Described by the CRD current regulator diode be the active filter circuit that constitutes of main body as shown in Figure 2, comprise the T type filter circuit that constitutes by current regulator diode CRD4, current regulator diode CRD4 and capacitor C 3; Current regulator diode CRD4 in the T type filter circuit is anodal to be connected with the positive pole of full-wave rectifying circuit, and the current regulator diode CRD5 negative pole in the T type filter circuit is connected with LED light fixture group.The ac input end of described full-wave rectifying circuit and voltage are 110V or 220V, and frequency is that the AC power of 50HZ or 60HZ connects.
Operation principle of the present utility model
As shown in Figure 1, full-wave rectifying circuit of the present utility model is made of diode D1～D4, and π type filter circuit is made of current regulator diode CRD1～CRD3 and capacitor C 1 and capacitor C 2.The LC π type filter circuit that capacitance-resistance π type filter circuit that this circuit and traditional RC constitute or LC constitute is different.Because the characteristic of CRD current regulator diode is constant current, has big motional impedance for fluctuation voltage, semiconductor device has good transient response simultaneously, this just makes the CRD current regulator diode have the dual characteristics of big impedance and broadband for fluctuation voltage, that is to say, the performance that has resistance R and inductance L in traditional π type filter circuit simultaneously all has good filter action to the ripple of high and low frequency.The big motional impedance of CRD current regulator diode and electric capacity are formed large time constant, can be so that the condenser capacity in the π type filter circuit construction is chosen littler 5-10 times than the capacitance in traditional π type filter circuit construction.The CRD current regulator diode is an active device, therefore can think active filter.For 100V, 110V, the load of 220V high-voltage LED, ripple coefficient of the present utility model can reach 0.5%.Along with reducing of ripple, the CRD current regulator diode enters the DC operation pattern, and constant current accuracy increases substantially.
The big motional impedance of current regulator diode has been isolated full-wave rectification link and filter capacitor effectively, guaranteed the angle of flow of rectifier diode D1～D4 in the full-wave rectifying circuit, the all-wave waveform that has kept full-wave rectification, eliminate the current waveform distortion of rectifier diode D1～D4 significantly, thereby guaranteed the High Power Factor of circuit.The power factor of this circuit structure is issued to more than 90% in the rated voltage situation.It is the high-voltage diode of 1N4007 that all diodes in the utility model are all selected model for use.It is the electric capacity of 1 microfarad/100V that capacitor C 2 and capacitor C 3 are selected specification for use.
Can be by following experiment confirm the beneficial effects of the utility model.
Experimental circuit as shown in Figure 1, the voltage of power supply is respectively normal voltage 220V, be higher than three groups of the voltage 260V of standard and substandard voltage 180V, supply frequency is 50HZ, the rated voltage of LED light fixture group is 220V.
Experimental result is as follows, and when supply power voltage was 220V, the actual current that records LED light fixture group was 20 milliamperes; Empirical curve as shown in Figure 5.
When supply power voltage was 260V, the actual current that records LED light fixture group was 21 milliamperes; Empirical curve as shown in Figure 4.
When supply power voltage was 260V, the actual current that records LED light fixture group was 19.8 milliamperes, and empirical curve as shown in Figure 6.
Conclusion is: when the fluctuation range of voltage is 20%, have only (21-19.8) ÷ 21=5.7% by the current fluctuation scope of LED light fixture group.Has good current stability.
Claims (4)
1. a led drive circuit that improves the led drive circuit quality comprises full-wave rectifying circuit, it is characterized in that, full-wave rectifying circuit be that the active filter circuit that main body constitutes is connected by the CRD current regulator diode.
2. the led drive circuit of raising led drive circuit quality according to claim 1 is characterized in that: described is that active filter circuit that main body constitutes comprises the π type filter circuit that is made of current regulator diode CRD2 and capacitor C 1 and capacitor C 2 by the CRD current regulator diode; The input of π type filter circuit is connected with the positive pole of full-wave rectifying circuit through current regulator diode CRD1, and the output of π type filter circuit is connected with LED light fixture group through current regulator diode CRD3.
3. the led drive circuit of raising led drive circuit quality according to claim 1 is characterized in that: described is that the active filter circuit that main body constitutes comprises the T type filter circuit that is made of current regulator diode CRD4, current regulator diode CRD4 and capacitor C 3 by the CRD current regulator diode; Current regulator diode CRD4 in the T type filter circuit is anodal to be connected with the positive pole of full-wave rectifying circuit, and the current regulator diode CRD5 negative pole in the T type filter circuit is connected with LED light fixture group.
4. the led drive circuit of raising led drive circuit quality according to claim 1 is characterized in that: the ac input end of described full-wave rectifying circuit and voltage are 110V or 220V, and frequency is that the AC power of 50HZ or 60HZ connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020685904XU CN201904960U (en) | 2010-12-29 | 2010-12-29 | LED drive circuit capable of improving quality of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020685904XU CN201904960U (en) | 2010-12-29 | 2010-12-29 | LED drive circuit capable of improving quality of LED drive circuit |
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| CN201904960U true CN201904960U (en) | 2011-07-20 |
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| CN201020685904XU Expired - Fee Related CN201904960U (en) | 2010-12-29 | 2010-12-29 | LED drive circuit capable of improving quality of LED drive circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045929A (en) * | 2010-12-29 | 2011-05-04 | 贵州煜立电子科技有限公司 | Method for improving quality of light-emitting diode (LED) drive circuit and LED drive circuit |
| CN105453702A (en) * | 2013-08-29 | 2016-03-30 | 矢崎总业株式会社 | Illumination device |
| CN106487339A (en) * | 2015-08-28 | 2017-03-08 | 贵州煜立电子科技有限公司 | The improved method of non-resistance semiconductor integrated universal operational amplifier and its amplifier |
| CN111163555A (en) * | 2020-01-07 | 2020-05-15 | 上海兴为视觉科技股份有限公司 | LED drive circuit |
| CN111163563A (en) * | 2020-01-07 | 2020-05-15 | 上海兴为视觉科技股份有限公司 | LED control circuit |
-
2010
- 2010-12-29 CN CN201020685904XU patent/CN201904960U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045929A (en) * | 2010-12-29 | 2011-05-04 | 贵州煜立电子科技有限公司 | Method for improving quality of light-emitting diode (LED) drive circuit and LED drive circuit |
| CN102045929B (en) * | 2010-12-29 | 2014-12-03 | 贵州煜立电子科技有限公司 | Method for improving quality of light-emitting diode (LED) drive circuit and LED drive circuit |
| CN105453702A (en) * | 2013-08-29 | 2016-03-30 | 矢崎总业株式会社 | Illumination device |
| CN105453702B (en) * | 2013-08-29 | 2018-03-27 | 矢崎总业株式会社 | Illuminator |
| CN106487339A (en) * | 2015-08-28 | 2017-03-08 | 贵州煜立电子科技有限公司 | The improved method of non-resistance semiconductor integrated universal operational amplifier and its amplifier |
| CN111163555A (en) * | 2020-01-07 | 2020-05-15 | 上海兴为视觉科技股份有限公司 | LED drive circuit |
| CN111163563A (en) * | 2020-01-07 | 2020-05-15 | 上海兴为视觉科技股份有限公司 | LED control circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110720 Termination date: 20141229 |
|
| EXPY | Termination of patent right or utility model |