CN205648105U - Linear constant current circuit of LED - Google Patents
Linear constant current circuit of LED Download PDFInfo
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- CN205648105U CN205648105U CN201620420349.5U CN201620420349U CN205648105U CN 205648105 U CN205648105 U CN 205648105U CN 201620420349 U CN201620420349 U CN 201620420349U CN 205648105 U CN205648105 U CN 205648105U
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a linear constant current circuit of LED, it presses control circuit to include the LED banks, be used for driving the linear constant -current drive circuit of LED banks and be used for controlling extending of LED banks luminance, linear constant -current drive circuit concatenates including insurance resistance, bridge type rectifier diode, electrolytic capacitor, first resistance, the linear constant current control ware of second and fourth resistance, insurance resistance, bridge type rectifier diode, LED banks, the linear constant current control ware of second and fourth resistance in proper order, and electrolytic capacitor and first resistance connect in parallel respectively between bridge type rectifier diode's positive polarity output and negative polarity output, wide first linear constant current control ware and third resistance of pressing control circuit to include interconnect, the width is pressed control circuit and is connect in linear constant -current drive circuit. The utility model discloses the circuit is simple, and small in size adopts the utility model discloses, can realize high light efficiency effectively, width voltage, the effect of low pressure flicker free.
Description
Technical field
This utility model relates to LED electric light source technology field, particularly relates to a kind of LED linear constant-current circuit.
Background technology
LED is referred to as forth generation lighting source or green light source, has the features such as light efficiency height, life-span length, be widely used in various instruction, show, decorate, the field such as backlight, general lighting and urban landscape.Along with LED illumination technological progress constantly reduces with cost, LED just high-volume replaces traditional electric filament lamp and electricity-saving lamp.
As it is shown in figure 1, existing LED constant current drives power supply to be all based on the exploitation of switching circuit principle.Wherein, switching circuit has operating voltage range width, the advantages such as constant current performance is good, but the component number required for this switching circuit is the most, particularly switching circuit can produce bigger electromagnetic interference, needs to use original paper L1, Ce1, Ce2 realizes decay, to ensure that power supply meets EMC(electromagnetic
Compatibility electromagnetic compatibility) requirement, power supply cost is the most then caused to decline, volume also cannot do little, can not meet and produce and the demand in market, also the Miniaturization Design of LED it is unfavorable for, therefore, LED constant current based on the exploitation of switching circuit principle drives power supply to have many drawbacks such as element is many, cost is high, volume is big, thus causes light-adjustable LED lamp not popularized by market well.
Although as in figure 2 it is shown, existing constant current driver circuit for LED has the simple advantage of circuit, but it is low to have again light efficiency, the shortcomings such as operating voltage range is narrow, low pressure easily flicker simultaneously.
Therefore, how linear constant current is driven and the advantage of switch constant-current circuit combines, become problem demanding prompt solution improving existing LED linear constant-current circuit.
Summary of the invention
Technical problem to be solved in the utility model is, it is provided that a kind of circuit is simple, and the LED linear constant-current circuit of compact can be effectively realized specular removal, Width funtion, the effect of low pressure flicker free.
In order to solve above-mentioned technical problem, this utility model provides a kind of LED linear constant-current circuit, including LED group, for driving the linear constant current drive circuit of LED group and for controlling the wide pressure control circuit of LED group brightness；Described linear constant current drive circuit includes insuring resistance, bridge rectifier diode, electrochemical capacitor, the first resistance, the second Linear constant-current controller and the 4th resistance, described insurance resistance, bridge rectifier diode, LED group, the second Linear constant-current controller and the 4th resistance are sequentially connected in series, and described electrochemical capacitor and the first resistance are parallel between the positive polarity output terminal of bridge rectifier diode and negative polarity outfan respectively；Described wide pressure control circuit includes that interconnective first Linear constant-current controller and the 3rd resistance, described wide pressure control circuit are connected in described linear constant current drive circuit.
Improvement as such scheme, described LED group includes main LED group and the pair LED group being sequentially connected in series, one end of described wide pressure control circuit is connected between main LED group and secondary LED group, and the other end is connected with negative polarity outfan, the 4th resistance and second Linear constant-current controller of bridge rectifier diode respectively.
As the improvement of such scheme, described linear constant current drive circuit also includes the second electric capacity, and described second electric capacity is in parallel with described main LED group.
As the improvement of such scheme, described linear constant current drive circuit also includes the second resistance, and described second resistance is in parallel with described main LED group.
As the improvement of such scheme, described linear constant current drive circuit also includes diode, and described Diode series is between the positive polarity output terminal and LED group of bridge rectifier diode.
Implement this utility model, have the advantages that
This utility model LED linear constant-current circuit is by adding width pressure control circuit in linear constant-current drive circuit, it is achieved linear constant current drive circuit and the perfect adaptation of wide pressure control circuit, circuit is simple, compact.
Wherein, the linear constant current drive circuit that insurance resistance, bridge rectifier diode, electrochemical capacitor, the first resistance, the second Linear constant-current controller and the 4th resistance composition are basic, first Linear constant-current controller and the 3rd resistance form basic wide pressure control circuit, coordinating of control circuit is pressed with periphery width by linear constant current drive circuit, specular removal can be effectively realized, Width funtion, the effect of low pressure flicker free, and there is good line regulation, can effectively reduce production cost, pole is beneficial to the design of LED, produces and promotes.
Accompanying drawing explanation
Fig. 1 is that existing LED constant current based on the exploitation of switching circuit principle drives power supply；
Fig. 2 is existing constant current driver circuit for LED；
Fig. 3 is the first embodiment circuit diagram of this utility model LED linear constant-current circuit；
Fig. 4 is the second embodiment circuit diagram of this utility model LED linear constant-current circuit；
Fig. 5 is the 3rd embodiment circuit diagram of this utility model LED linear constant-current circuit.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, this utility model is described in further detail.Only this statement, this utility model occur in the text or i.e. will appear from up, down, left, right, before and after, the orientation word such as inside and outside, only on the basis of accompanying drawing of the present utility model, it is not to concrete restriction of the present utility model.
The utility model discloses a kind of LED linear constant-current circuit, it includes LED group, for driving the linear constant current drive circuit of LED group and for controlling the wide pressure control circuit of LED group brightness, described wide pressure control circuit is connected in described linear constant current drive circuit, wherein, described LED group includes that the main LED group 1 being sequentially connected in series and secondary LED group 2, main LED group 1 and secondary LED group 2 include multiple LED being sequentially connected in series respectively.
See Fig. 3, Fig. 3 and show the first embodiment of this utility model LED linear constant-current circuit.
Described linear constant current drive circuit includes insuring resistance FR1, bridge rectifier diode DB1, electrochemical capacitor CE1, the first resistance R1, the second Linear constant-current controller U2 and the 4th resistance R4, described insurance resistance FR1, bridge rectifier diode DB1, LED group, the second Linear constant-current controller U2 and the 4th resistance R4 are sequentially connected in series, and described electrochemical capacitor CE1 and the first resistance R1 is parallel between the positive polarity output terminal of bridge rectifier diode DB1 and negative polarity outfan respectively.
Principle according to LED, need to use linear constant current drive circuit to drive LED group guarantee LED group normally, reliably work, as shown in Figure 3, the voltage of LED group is close with the voltage at electrochemical capacitor CE1 two ends, electric current restriction is carried out by the second Linear constant-current controller U2 and the 4th resistance R4, the electric current the flowing through LED group maximum operating currenbt less than LED can be made, it is ensured that the service life of LED group.Wherein, described electrochemical capacitor CE1 can be filtered and smooth the electric current flowing through LED group to input voltage, thus improves the light efficiency of LED, it addition, when the power of LED group is less, can omit electrochemical capacitor CE1, to simplify circuit structure further.
Described wide pressure control circuit includes interconnective first Linear constant-current controller U1 and the 3rd resistance R3, one end of described wide pressure control circuit is connected between main LED group 1 and secondary LED group 2, and the other end is connected with negative polarity outfan, the 4th resistance R4 and the second Linear constant-current controller U2 of bridge rectifier diode DB1 respectively.
It should be noted that in the case of normal input voltage, the virtual value of input voltage is nearly equal, so that LED group can obtain higher light efficiency with total VF voltage (i.e. feedback voltage) of output LED group；
Therefore, shown in Fig. 1 and Fig. 2, this utility model LED linear constant-current circuit is compared with existing LED constant current driving power supply based on the exploitation of switching circuit principle, and circuit is the simplest, compact.Specifically, this utility model is by adding width pressure control circuit in linear constant-current drive circuit, realize the perfect adaptation of linear constant current drive circuit and wide pressure control circuit, specular removal, Width funtion, the effect of low pressure flicker free can be effectively realized, and there is good line regulation, can effectively reduce production cost, pole is beneficial to the design of LED, produces and promotes.
See Fig. 4, Fig. 4 shows the second embodiment of this utility model LED linear constant-current circuit, unlike the first embodiment shown in Fig. 3, in the present embodiment, described linear constant current drive circuit also includes the second electric capacity C2, the second resistance R2 and diode D1, and wherein, described second electric capacity C2 is in parallel with described main LED group 1, described second resistance R2 is in parallel with described main LED group 1, and described diode D1 is series between the positive polarity output terminal of bridge rectifier diode DB1 and LED group.
It should be noted that described second electric capacity C2, the second resistance R2 and diode D1 can delete according to practical situation.
See Fig. 5, Fig. 5 and show the 3rd embodiment of this utility model LED linear constant-current circuit.It should be noted that the deformation that the present embodiment is the second embodiment, the present embodiment is also based on above-mentioned theory evolution and forms.
As from the foregoing, this utility model LED linear constant-current circuit is by adding width pressure control circuit in linear constant-current drive circuit, realize the perfect adaptation of linear constant current drive circuit and wide pressure control circuit, specular removal, Width funtion, the effect of low pressure flicker free can be effectively realized, and there is good line regulation, can effectively reduce production cost, pole is beneficial to the design of LED, produces and promotes.
The above is preferred implementation of the present utility model; it should be pointed out that, for those skilled in the art, on the premise of without departing from this utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.
Claims (5)
1. a LED linear constant-current circuit, it is characterised in that include LED group, for driving the linear constant current drive circuit of LED group and for controlling the wide pressure control circuit of LED group brightness；
Described linear constant current drive circuit includes insuring resistance, bridge rectifier diode, electrochemical capacitor, the first resistance, the second Linear constant-current controller and the 4th resistance, described insurance resistance, bridge rectifier diode, LED group, the second Linear constant-current controller and the 4th resistance are sequentially connected in series, and described electrochemical capacitor and the first resistance are parallel between the positive polarity output terminal of bridge rectifier diode and negative polarity outfan respectively；
Described wide pressure control circuit includes that interconnective first Linear constant-current controller and the 3rd resistance, described wide pressure control circuit are connected in described linear constant current drive circuit.
2. LED linear constant-current circuit as claimed in claim 1, it is characterized in that, described LED group includes main LED group and the pair LED group being sequentially connected in series, one end of described wide pressure control circuit is connected between main LED group and secondary LED group, and the other end is connected with negative polarity outfan, the 4th resistance and second Linear constant-current controller of bridge rectifier diode respectively.
3. LED linear constant-current circuit as claimed in claim 2, it is characterised in that described linear constant current drive circuit also includes the second electric capacity, and described second electric capacity is in parallel with described main LED group.
4. LED linear constant-current circuit as claimed in claim 2, it is characterised in that described linear constant current drive circuit also includes the second resistance, and described second resistance is in parallel with described main LED group.
5. LED linear constant-current circuit as claimed in claim 1, it is characterised in that described linear constant current drive circuit also includes diode, and described Diode series is between the positive polarity output terminal and LED group of bridge rectifier diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620420349.5U CN205648105U (en) | 2016-05-11 | 2016-05-11 | Linear constant current circuit of LED |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620420349.5U CN205648105U (en) | 2016-05-11 | 2016-05-11 | Linear constant current circuit of LED |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205648105U true CN205648105U (en) | 2016-10-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620420349.5U Active CN205648105U (en) | 2016-05-11 | 2016-05-11 | Linear constant current circuit of LED |
Country Status (1)
| Country | Link |
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| CN (1) | CN205648105U (en) |
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2016
- 2016-05-11 CN CN201620420349.5U patent/CN205648105U/en active Active
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