CN201919210U - LED (light emitting diode) drive circuit - Google Patents
LED (light emitting diode) drive circuit Download PDFInfo
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- CN201919210U CN201919210U CN2010206363631U CN201020636363U CN201919210U CN 201919210 U CN201919210 U CN 201919210U CN 2010206363631 U CN2010206363631 U CN 2010206363631U CN 201020636363 U CN201020636363 U CN 201020636363U CN 201919210 U CN201919210 U CN 201919210U
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Abstract
The utility model discloses an LED (light emitting diode) drive circuit which comprises a rectification circuit (1), wherein the alternating current input end of the rectification circuit is connected with an alternating power supply, the positive pole of the rectification circuit is connected an LED load by a first stage constant current circuit (2) and a second stage constant current circuit, the other end of the LED load is connected with the negative pole output end of the rectification circuit, a passive power factor compensation circuit (3) is arranged between the first stage constant current circuit and the second stage constant current circuit. In the utility model, a 2DHL or 2THL series constant current diode manufactured by Guizhou YUNI Electronics and Technology Co., Ltd is taken as a constant current element for driving the circuit, the circuit is simple, is directly connected with an alternating mains supply of 220V (110V) or 50Hz or 60Hz, and can drive the LED luminous tube, and the defects of low power factor and driving efficiency, difficultly controlled constant current error, complicated circuit structure and the like existing in the prior art are overcome.
Description
Technical field
The utility model relates to a kind of drive circuit, particularly relates to a kind of led drive circuit.The applied technical field that belongs to novel current regulator diode.
Background technology
At present, led drive circuit generally is to be converted to direct current by the AC-DC conversion to drive, and major part is to adopt electronic module or integrated circuit to realize constant current in the drive circuit, and the AC-DC converter needs current rectifying and wave filtering circuit.Phase shift and wave distortion that current rectifying and wave filtering circuit produces cause power factor to descend, and the harmonic wave of generation has harmful effect to electrical network.
Summary of the invention
The purpose of this utility model is, a kind of led drive circuit is provided.The utility model adopts the novel electron device, and current regulator diode has proposed a kind of novel circuit structure of utilizing mains-supplied for using main body, can improve the method for supplying power to of current LED lamp.
The technical solution of the utility model: a kind of led drive circuit, comprise rectification circuit, the rectification circuit ac input end is connected with AC power, and the rectification circuit anode output is connected with the LED load with second level constant-current circuit through first order constant-current circuit; The other end of LED load is connected with the rectification circuit cathode output end; Between first order constant-current circuit and second level constant-current circuit, be provided with the passive power factor compensating circuit.
In the aforesaid led drive circuit, described first order constant-current circuit and second level constant-current circuit are the current regulator diode of 2DHL or 2THL series.
In the aforesaid led drive circuit, described rectification circuit comprises the full-wave rectification bridge that is made of four diode D1～D4, and the model of four diodes is IN4007.
In the aforesaid led drive circuit, described passive power factor compensating circuit comprises two series arms; Article one, series arm is made of with the diode D5 series connection that oppositely is connected capacitor C 1, and diode D6 that another route oppositely connects and capacitor C 2 series connection constitute; Article one, the negative pole of the diode D6 of capacitor C 1 end of series arm and second series arm is connected with the connected node of first order constant-current circuit with second level constant-current circuit; Article one, the other end of series arm and second series arm is connected with the rectification circuit negative pole; Article two, oppositely be connected with diode D7 between the connected node of series arm.
Compared with prior art, the utility model is to use Guizhou YUNI Electronics ﹠ Technology Co., Ltd. to produce the constant flow element of the current regulator diode of 2DHL or 2THL series as drive circuit, circuit is simple, because current regulator diode is big motional impedance, the time constant of forming with capacitor is big, fill out the capacitor C1 in the paddy circuit, the capacity of C2 can reduce significantly, direct 220V (110V)/50HZ/60HZ electric main, can the driving LED luminous tube, low to overcome the power factor that prior art exists, driving efficient is low, the difficult control of constant current error, the circuit structure complexity, the volume that uses big capacity electrochemical capacitor to bring is big, the deficiency of problem such as easily under the environment that temperature raises, damage.
Description of drawings
Fig. 1 is a theory diagram of the present utility model:
Fig. 2 is an electrical schematic diagram of the present utility model;
Fig. 3 is a critical piece current regulator diode performance diagram of the present utility model.
Being labeled as in the accompanying drawing: 1-rectification circuit, 2-first order constant-current circuit, 3-passive power factor compensating circuit, 4-second level constant-current circuit, 5-LED load.
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.The utility model as depicted in figs. 1 and 2 shown in.A kind of led drive circuit comprises rectification circuit 1, and rectification circuit 1 ac input end is connected with AC power, and rectification circuit 1 cathode output end is connected with LED load 5 with second level constant-current circuit 4 through first order constant-current circuit 2; The other end of LED load 5 is connected with rectification circuit 1 cathode output end; Between first order constant-current circuit 2 and second level constant-current circuit 4, be provided with passive power factor compensating circuit 3.Described first order constant-current circuit 2 and second level constant-current circuit 4 are the current regulator diode of 2DHL or 2THL series.Described rectification circuit comprises the full-wave rectification bridge that is made of four diode D1～D4, and the model of four diodes is IN4007.Described passive power factor compensating circuit 3 comprises two series arms; Article one, series arm is made of with the diode D5 series connection that oppositely is connected capacitor C 1, and diode D6 that another route oppositely connects and capacitor C 2 series connection constitute; Article one, the negative pole of the diode D6 of capacitor C 1 end of series arm and second series arm is connected with the connected node of first order constant-current circuit 2 with second level constant-current circuit 4; Article one, the other end of series arm and second series arm is connected with rectification circuit 1 negative pole; Article two, oppositely be connected with diode D7 between the connected node of series arm.
Fig. 3 is a critical piece current regulator diode performance diagram of the present utility model.As seen from the figure, 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 load 5.Can prolong the useful life of LED load 5, guarantee the job stability of LED load 5, the luminous light that goes out does not glimmer.
The utility model in the specific implementation, two current regulator diodes adopt Guizhou YUNI Electronics ﹠ Technology Co., Ltd. to produce 2DHL/2THL series current regulator diode, select concrete model according to the required electric current of actual loading, also can be by series connection, parallel connection is combined into required constant current voltage and required operating voltage.Power supply be input as 220V(110V)/the 50HZ/60HZ electric main, insert constant-current diode again through full-wave bridge rectifier circuit, connect a passive power factor compensating circuit (PFC fills out the paddy circuit) then, after passive power factor compensating circuit 3, connect current regulator diode output constant current driven LED load again.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.
Claims (4)
1. led drive circuit, it is characterized in that: comprise rectification circuit (1), rectification circuit (1) ac input end is connected with AC power, and rectification circuit (1) cathode output end is connected with LED load (5) with second level constant-current circuit (4) through first order constant-current circuit (2); The other end of LED load (5) is connected with rectification circuit (1) cathode output end; Between first order constant-current circuit (2) and second level constant-current circuit (4), be provided with passive power factor compensating circuit (3).
2. led drive circuit according to claim 1 is characterized in that: described first order constant-current circuit (2) and second level constant-current circuit (4) are the current regulator diode of 2DHL or 2THL series.
3. led drive circuit according to claim 1 is characterized in that: described rectification circuit comprises the full-wave rectification bridge that is made of four diode D1～D4, and the model of four diodes is IN4007.
4. according to claim 2 or 3 described led drive circuits, it is characterized in that: described passive power factor compensating circuit (3) comprises two series arms; Article one, series arm is made of with the diode D5 series connection that oppositely is connected capacitor C 1, and diode D6 that another route oppositely connects and capacitor C 2 series connection constitute; Article one, the negative pole of the diode D6 of capacitor C 1 end of series arm and second series arm is connected with the connected node of first order constant-current circuit (2) with second level constant-current circuit (4); Article one, the other end of series arm and second series arm is connected with rectification circuit (1) negative pole; Article two, oppositely be connected with diode D7 between the connected node of series arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206363631U CN201919210U (en) | 2010-12-01 | 2010-12-01 | LED (light emitting diode) drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206363631U CN201919210U (en) | 2010-12-01 | 2010-12-01 | LED (light emitting diode) drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201919210U true CN201919210U (en) | 2011-08-03 |
Family
ID=44418996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206363631U Expired - Lifetime CN201919210U (en) | 2010-12-01 | 2010-12-01 | LED (light emitting diode) drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201919210U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021156382A1 (en) * | 2020-02-07 | 2021-08-12 | PulsIV Limited | Electrical conversion |
-
2010
- 2010-12-01 CN CN2010206363631U patent/CN201919210U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021156382A1 (en) * | 2020-02-07 | 2021-08-12 | PulsIV Limited | Electrical conversion |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110803 |
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| CX01 | Expiry of patent term |