CN204069420U - LED illumination driving circuit - Google Patents
LED illumination driving circuit Download PDFInfo
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- CN204069420U CN204069420U CN201420371948.3U CN201420371948U CN204069420U CN 204069420 U CN204069420 U CN 204069420U CN 201420371948 U CN201420371948 U CN 201420371948U CN 204069420 U CN204069420 U CN 204069420U
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Abstract
The utility model discloses a kind of LED illumination drive circuit.Power input ACIN connects protective tube one end respectively, first electric capacity one end, 3 pin of electric bridge, the protective tube other end, the first electric capacity other end all connects 1 pin of electric bridge, 2 pin of electric bridge connect the first diode cathode respectively, 3rd electric capacity one end, first resistance one end, 4th diode cathode, 9th electric capacity one end and LED, 4 pin of electric bridge connect second electric capacity one end respectively, 3rd diode cathode, second inductance one end, 5th diode cathode, the second electric capacity other end is connected on the first diode, between second diode, second diode, the indirect 3rd electric capacity other end of the 3rd diode, another termination of second inductance the 4th resistance sliding end, second resistance one end, 6th diode cathode, 8th electric capacity one end, 7th electric capacity one end, 6th electric capacity one end, 4 pin of driving chip.The utility model structure is simple, and constant current accuracy is high, good dimming effect, easy to use and reliable.
Description
Technical field
The utility model relates to a kind of drive circuit, be specifically related to a kind of LED illumination driving circuit.
background technology
Along with the development of LED technology, LED is more and more extensive in the application of general illumination field.LED, as the light source of electric lighting, owing to needing constant current when LED works, therefore needs special drive circuit, at present LED drive circuit more complicated on the market, and constant current accuracy is not high, and dimming effect is not good, greatly have impact on result of use.
Summary of the invention
For the deficiency that prior art exists, the utility model object is to provide a kind of LED illumination driving circuit, and structure is simple, and constant current accuracy is high, good dimming effect, easy to use and reliable.
To achieve these goals, the utility model realizes by the following technical solutions: LED illumination driving circuit, comprises driving chip, protective tube, electric bridge, power input ACIN connects protective tube one end respectively, first electric capacity one end, 3 pin of electric bridge, the protective tube other end, the first electric capacity other end all connects 1 pin of electric bridge, and 2 pin of electric bridge connect the first diode cathode respectively, 3rd electric capacity one end, first resistance one end, 4th diode cathode, 9th electric capacity one end and LED, 4 pin of electric bridge connect second electric capacity one end respectively, 3rd diode cathode, second inductance one end, 5th diode cathode, the second electric capacity other end is connected on the first diode, between second diode, the second diode, the indirect 3rd electric capacity other end of the 3rd diode, another termination of the second inductance the 4th resistance sliding end, second resistance one end, 6th diode cathode, 8th electric capacity one end, 7th electric capacity one end, 6th electric capacity one end, 4 pin of driving chip, 5th electric capacity one end, 4th electric capacity one end, the 4th resistance fixed end connects the source electrode of the 3rd resistance to metal-oxide-semiconductor, the second resistance other end, 3 pin of the 6th electric capacity other end and driving chip, 2 pin of the 5th another termination driving chip of electric capacity, 6 pin of driving chip connect the 7th electric capacity other end, the 8th electric capacity other end, 6th diode cathode, 1 pin of the 5th diode cathode and driving chip, 8 pin of another termination driving chip of the first resistance, the drain electrode of metal-oxide-semiconductor is connected to the first inductance and the 4th diode, and the first inductance is connected with the 9th electric capacity and LED, and the grid of metal-oxide-semiconductor connects 5 pin of driving chip.
As preferably, described driving chip adopts the driving chip of model FT870B.
The utility model structure is simple, and constant current accuracy is high, good dimming effect, easy to use and reliable.
Accompanying drawing explanation
The utility model is described in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is circuit diagram of the present utility model.
Embodiment
The technological means realized for making the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the utility model further.
With reference to Fig. 1, this embodiment by the following technical solutions: LED illumination driving circuit, comprises driving chip U1, protective tube F1, electric bridge B1, power input ACIN connect protective tube F1 one end respectively, first electric capacity C1 one end, 3 pin of electric bridge B1, the protective tube F1 other end, the first electric capacity C1 other end all connects 1 pin of electric bridge B1, and 2 pin of electric bridge B1 connect the first diode D1 negative pole respectively, 3rd electric capacity C3 one end, first resistance R1 one end, 4th diode D4 negative pole, 4 pin of the 9th electric capacity C9 one end and LED, electric bridge B1 connect second electric capacity C2 one end respectively, 3rd diode D3 positive pole, second inductance L 2 one end, 5th diode D5 positive pole, the second electric capacity C2 other end is connected on the first diode D1, between second diode D2, the second diode D2, the indirect 3rd electric capacity C3 other end of the 3rd diode D3, second another termination of inductance L 2 the 4th resistance R4 sliding end, second resistance R2 one end, 6th diode D6 positive pole, 8th electric capacity C8 one end, 7th electric capacity C7 one end, 6th electric capacity C6 one end, 4 pin of driving chip U1, 5th electric capacity C5 one end, 4th electric capacity C4 one end, the 4th resistance R4 fixed end connects the source electrode of the 3rd resistance R3 to metal-oxide-semiconductor Q1, the second resistance R2 other end, 3 pin of the 6th electric capacity C6 other end and driving chip U1,2 pin of another termination driving chip of the 5th electric capacity C5 U1, 6 pin of driving chip U1 connect the 7th electric capacity C7 other end, the 8th electric capacity C8 other end, 6th diode D6 negative pole, 1 pin of the 5th diode D5 negative pole and driving chip U1,8 pin of another termination driving chip of the first resistance R1 U1, the drain electrode of metal-oxide-semiconductor Q1 is connected to the first inductance L 1 and the 4th diode D4, and the first inductance L 1 is connected with the 9th electric capacity C9 and LED, and the grid of metal-oxide-semiconductor Q1 connects 5 pin of driving chip U1.
The driving chip of this embodiment adopts FT870B, it is the efficient constant-current type LED drive IC of a PWM control type, normally can work under the input voltage of 15 ~ 500V, the operating frequency of fixing 25K, the maximum output current that can drive 1A, constant current accuracy reaches ± and 5%, and support PWM dimming function.The change of input voltage range, input power range fluctuation is less.This operation principle is: when switching tube conducting, main current loop is ACIN-F1-B1-LED-L1-Q1-R4-L2-B1-ACIN, and now AC powers to LED, and makes the first inductance L 1 stored energy; When switching tube turns off, main current loop is L1-D4-LED-L1, and now the first inductance L 1 releases energy, and keeps the output of LED.During due to switching tube conducting, the electric current flowing through LED also flows through R4 simultaneously, so detect by the voltage detected on R2 the electric current flowing through LED, thus reaches the object of constant current.
In circuit, C2, C3, D1, D2, D3 are PFC correcting circuit, the main power factor improving input.L2, D5, C7 form auxiliary power supply loop, thus turn off the power supply of HV pin, reduce loss, raise the efficiency.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof
.
Claims (2)
1.LED illumination driving circuit, is characterized in that, comprises driving chip, protective tube, electric bridge, power input ACIN connects protective tube one end respectively, first electric capacity one end, 3 pin of electric bridge, the protective tube other end, the first electric capacity other end all connects 1 pin of electric bridge, and 2 pin of electric bridge connect the first diode cathode respectively, 3rd electric capacity one end, first resistance one end, 4th diode cathode, 9th electric capacity one end and LED, 4 pin of electric bridge connect second electric capacity one end respectively, 3rd diode cathode, second inductance one end, 5th diode cathode, the second electric capacity other end is connected on the first diode, between second diode, the second diode, the indirect 3rd electric capacity other end of the 3rd diode, another termination of the second inductance the 4th resistance sliding end, second resistance one end, 6th diode cathode, 8th electric capacity one end, 7th electric capacity one end, 6th electric capacity one end, 4 pin of driving chip, 5th electric capacity one end, 4th electric capacity one end, the 4th resistance fixed end connects the source electrode of the 3rd resistance to metal-oxide-semiconductor, the second resistance other end, 3 pin of the 6th electric capacity other end and driving chip, 2 pin of the 5th another termination driving chip of electric capacity, 6 pin of driving chip connect the 7th electric capacity other end, the 8th electric capacity other end, 6th diode cathode, 1 pin of the 5th diode cathode and driving chip, 8 pin of another termination driving chip of the first resistance, the drain electrode of metal-oxide-semiconductor is connected to the first inductance and the 4th diode, and the first inductance is connected with the 9th electric capacity and LED, and the grid of metal-oxide-semiconductor connects 5 pin of driving chip.
2. LED illumination driving circuit according to claim 1, is characterized in that, described driving chip adopts the driving chip of model FT870B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420371948.3U CN204069420U (en) | 2014-07-08 | 2014-07-08 | LED illumination driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420371948.3U CN204069420U (en) | 2014-07-08 | 2014-07-08 | LED illumination driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204069420U true CN204069420U (en) | 2014-12-31 |
Family
ID=52210856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420371948.3U Expired - Fee Related CN204069420U (en) | 2014-07-08 | 2014-07-08 | LED illumination driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204069420U (en) |
-
2014
- 2014-07-08 CN CN201420371948.3U patent/CN204069420U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20141231 Termination date: 20160708 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |