CN202143244U - LED light source radiationless drive circuit - Google Patents
LED light source radiationless drive circuit Download PDFInfo
- Publication number
- CN202143244U CN202143244U CN201120021112U CN201120021112U CN202143244U CN 202143244 U CN202143244 U CN 202143244U CN 201120021112 U CN201120021112 U CN 201120021112U CN 201120021112 U CN201120021112 U CN 201120021112U CN 202143244 U CN202143244 U CN 202143244U
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- circuit
- light source
- led
- current
- radiationless
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Abstract
Provided is an LED (Light Emitting Diode) light source radiationless drive circuit, comprising a resettable fuse and a rectification circuit; the rectification circuit is in series connection with a protection circuit, then in parallel connection with a filter circuit and then in connection with a light source LED which is in connection with a constant current circuit. In order to overcome radiation and stroboflash, the circuit of the utility model employs a pure direct current solution, and the electromagnetic radiation is zero. A pulse width modulation link is omitted, thus the circuit is simple and the number of components is small, but the reliability is high and the cost is low. In order to minimize starting impact current filtering, a current limiting and protection link is provided before a filtering capacitance. Dimming resistors of a constant current link can be changed to meet lighting requirements of different power.
Description
Technical field
The invention belongs to lighting field, the alternating current of 220V (or 110V) is converted into the very little direct current of ripple coefficient through rectification and filter circuit, luminous through constant current link driving LED again.
Background technology
At present general led light source drive circuit is in order to adapt to the wide voltage of 85V～265V; The design of drive circuit more complicated has adopted pulse-width modulation circuit, because pulse-width modulation circuit must have the concussion link; Just produced electromagnetic radiation, not only off-energy but also influence the healthy of people.Drive circuit through selecting (different manufacturers, different capacity) is tested, and is 100 μ w/cm in the amount of radiation apart from light source 100mm place
2～2000 μ w/cm
2, the safe amount of radiation of national Specification is 25 μ w/cm
2Especially as the desk lamp light source, because light source is very near apart from user's head, so influence is bigger.Because exist concussion just to certainly exist stroboscopic, just frequency is higher, human eye perceives is not come out.Long-term work under the stroboscopic illumination occasion of upper frequency, the ciliary muscle of eyes is easy to generate fatigue.In order to overcome radiation and stroboscopic, this circuit has adopted the solution of pure direct current, and electromagnetic radiation is zero, owing to removed the pulse-width modulation link, circuit is simple, and components and parts are few, and reliability is high, and cost is low.
Summary of the invention
Self-healing fuse, rectification circuit are arranged in the circuit of the present invention, and protective circuit of series connection again and a filter circuit, connects light source led then behind rectification circuit, connects a constant-current circuit at the back at LED.The present invention is the alternating current that power supply is come in; Through self-healing fuse, behind rectifying and wave-filtering, become the very little direct current of ripple coefficient more earlier; Directly be added on the LED positive pole of series connection; In the end the negative pole of one-level LED inserts a constant-current circuit, and the electric current with the control entire circuit makes it within the optimum range of LED.Impulse current when starting in order to reduce adds a current limliting and protective circuit before filter capacitor.In order to adapt to the lighting requirement of different capacity, the dimming resistor in the available change constant-current circuit is accomplished.
Description of drawings
This Figure of description is the schematic diagram of the radiationless drive circuit of led light source; As shown in the figure: the alternating current of 220V (or 110V) inserts the back and gets into the bridge rectifier of being made up of 4 diode D1～4 through self-healing fuse FU earlier; Current-limiting protection circuit through voltage-stabiliser tube DV and resistance R 1 composition after the rectification charges to filter capacitor C, when voltage is charged to certain altitude, lights LED.Electric current again through constant-current circuit with current stabilization on the steady state value that a LED is fit to, to guarantee light decay and the life-span of LED.Change resistance R 2, can change the current value of constant current.
Embodiment
Rectifier bridge in the circuit can be used 4 rectifier diodes, also can use the rectifier bridge of encapsulation.Whole drive circuit can be encapsulated in the metal-back; The incoming line positive pole that meets LED and negative line are extracted except that 2, if versatility is better; Can the dimming resistor R2 of constant-current source be encapsulated in the outside, the resistance through changing R2 is to adapt to different driving powers.
Claims (2)
1. radiationless drive circuit of led light source, it is characterized in that: this circuit has self-healing fuse, rectification circuit, and protective circuit of series connection behind rectification circuit again and a filter circuit, connects light source led then, connects a constant-current circuit at the back at LED.
2. the radiationless drive circuit of the led light source in the claim 1 is characterized in that: a dimming resistor is arranged in the constant-current circuit that the lower end of light source led seals in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120021112U CN202143244U (en) | 2011-01-21 | 2011-01-21 | LED light source radiationless drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120021112U CN202143244U (en) | 2011-01-21 | 2011-01-21 | LED light source radiationless drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202143244U true CN202143244U (en) | 2012-02-08 |
Family
ID=45554279
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120021112U Expired - Fee Related CN202143244U (en) | 2011-01-21 | 2011-01-21 | LED light source radiationless drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202143244U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102612198A (en) * | 2011-01-21 | 2012-07-25 | 李玉玲 | Nonradiative driving circuit of LED (light-emitting diode) light source |
-
2011
- 2011-01-21 CN CN201120021112U patent/CN202143244U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102612198A (en) * | 2011-01-21 | 2012-07-25 | 李玉玲 | Nonradiative driving circuit of LED (light-emitting diode) light source |
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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: 20120208 Termination date: 20160121 |
|
| EXPY | Termination of patent right or utility model |