CN201393321Y - Non-isolated low-current LED constant-current power supply - Google Patents
Non-isolated low-current LED constant-current power supply Download PDFInfo
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- CN201393321Y CN201393321Y CN200920139977U CN200920139977U CN201393321Y CN 201393321 Y CN201393321 Y CN 201393321Y CN 200920139977 U CN200920139977 U CN 200920139977U CN 200920139977 U CN200920139977 U CN 200920139977U CN 201393321 Y CN201393321 Y CN 201393321Y
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- power supply
- emitting diode
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Abstract
The utility model discloses a non-isolated low-current LED constant-current power supply. The power supply comprises a capacitor current-limiting reduction voltage circuit, and the output end of the bridge-type rectifier thereof is connected with an LED (light emitting diode) connected in series with a three-terminal regulator. The utility model ensures the operation of the LED to be in a normal voltage range through the three-terminal regulator, thereby prolonging the service life of the LED.
Description
Technical field
The utility model belongs to the LED power supply, relates to a kind of non-isolated little electric current LED constant-current supply.
Background technology
White-light LED illumination has the light efficiency height, volume is little, the life-span is long, environmental protection, advantage such as energy-conservation.Constantly entering into our work and various fields in life, be called as the 4th generation lighting source, national governments are all wideling popularize the LED illuminating engineering.Because LED illumination belongs to semiconductor light-emitting elements, advantage such as have promptly that volume is little, operating voltage is low, low in energy consumption, good mechanical property, life-span are long, it is poor also to exist temperature characterisitic, anti-overvoltage, characteristics such as anti-overcurrent characteristic difference.Therefore the LED light-emitting diode is very strict to the requirement of power supply, promptly needs stable constant current source power supply.
At present, the capacitance current-limiting reduction voltage circuit is a kind of common non-isolated low current power supply circuit, because its circuit is simple, volume is little, and cost is low, is commonly used to the driving power as small power LED illumination.Provide operating current with capacitance current-limiting step-down mode for load, have very big defective.Operating current as its supply load will change along with the variation of input supply voltage, and when supply voltage raises, its operating current will increase.And when supply voltage descends, operating current will reduce.Such variation can also be born concerning the less demanding load of quality of voltage for those, but for the demanding load of those power qualities, then can not bear such as the LED illumination.This will cause the variation of LED luminosity, even may surpass the running current of LED, cause the light decay of the too high acceleration led chip of temperature of LED, make its lost of life, may cause LED to burn out when serious.
The utility model content
The purpose of this utility model is to provide a kind of non-isolated little electric current LED constant-current supply, and its circuit structure is simple, can guarantee effectively that LED is operated in the normal voltage scope, prolongs its useful life.
The purpose of this utility model is achieved in that a kind of non-isolated little electric current LED constant-current supply, comprise the capacitance current-limiting reduction voltage circuit, output at its bridge rectifier is connecting the LED light-emitting diode, and LED light-emitting diode and a three terminal regulator are chained together.
Added three terminal regulator in the utility model circuit, when the input and output supply voltage changes in relative broad range, still can keep the LED operating current invariable like this, made the LED can be reliable and stable, the work that safety is long-term.The utility model circuit structure is simple, and is cheap for manufacturing cost, can guarantee effectively that LED is operated in the normal voltage scope, prolongs its useful life, is easy to promote.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the circuit connection structure schematic diagram of the utility model embodiment 1;
Fig. 2 is the circuit connection structure schematic diagram of the utility model embodiment 2.
Embodiment
A kind of non-isolated little electric current LED constant-current supply as shown in Figure 1 and Figure 2, comprises the capacitance current-limiting reduction voltage circuit, is connecting LED light-emitting diode 1 at the output of its bridge rectifier 2, and LED light-emitting diode 1 and a three terminal regulator 3 are chained together.Said LED light-emitting diode 1 is a LED lamp string structure.
As shown in Figure 1 and Figure 2, C
1Be the current limliting decompression capacitor, R1 is a bleeder resistance, C
2Be filter capacitor, C
3Be 0.1 μ F100V electric capacity, be used for eliminating the self-oscillation of three terminal regulator 3.Three terminal regulator 3 is the big electric current three terminal regulator of TL783CKC head pressure, and R2 is the 1/2W metalfilmresistor; R
VBe Zinc-oxide piezoresistor.
Its operation principle is as follows: select appropriate C
1, make input supply voltage when exchanging 200V, the operating current of LED lamp is 20mA.The constant-current source that then is made of three terminal regulator 3 when input supply voltage continues to raise works.The operating current of LED lamp is limited in 20mA.The rising with voltage does not increase, until input voltage rises to 260V.So just constituted the small current constant-current source of an AC-input voltage, can guarantee the work of LED lamp normal reliable in the voltage range of a broad from the 200V-260V wide input voltage range.
Because this power supply is non-isolated constant-current supply, only can be used for therefore that the people can not touch and not exposed LED light fixture in.As the LED bulb lamp; The LED wall lamp; In the LED light fixtures such as LED ceiling light.This power supply architecture simply belongs to linear power supply, the electromagnetic interference that does not have Switching Power Supply and produced.Therefore be fit to very much do the constant-current source of little electric current LED lamp.The bulb lamp of lighting of home particularly, wall lamp, ceiling light etc.The utility model cost is low, and is energy-conservation, and the life-span is long, and light is soft, is easy to promote.
Claims (2)
1, a kind of non-isolated little electric current LED constant-current supply comprises the capacitance current-limiting reduction voltage circuit, is connecting the LED light-emitting diode at the output of its bridge rectifier, and it is characterized in that: LED light-emitting diode and a three terminal regulator are chained together.
2, non-isolated little electric current LED constant-current supply according to claim 1, it is characterized in that: said LED light-emitting diode is a LED lamp string structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920139977U CN201393321Y (en) | 2009-03-19 | 2009-03-19 | Non-isolated low-current LED constant-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920139977U CN201393321Y (en) | 2009-03-19 | 2009-03-19 | Non-isolated low-current LED constant-current power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201393321Y true CN201393321Y (en) | 2010-01-27 |
Family
ID=41600143
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920139977U Expired - Fee Related CN201393321Y (en) | 2009-03-19 | 2009-03-19 | Non-isolated low-current LED constant-current power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201393321Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754516A (en) * | 2010-02-24 | 2010-06-23 | 宗慎平 | Method for stabilizing working current of light emitting diode (LED) power-saving lamp |
| CN101990348A (en) * | 2010-12-03 | 2011-03-23 | 上海嘉塘电子有限公司 | Power switching circuit special for LED and application thereof |
-
2009
- 2009-03-19 CN CN200920139977U patent/CN201393321Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101754516A (en) * | 2010-02-24 | 2010-06-23 | 宗慎平 | Method for stabilizing working current of light emitting diode (LED) power-saving lamp |
| CN101754516B (en) * | 2010-02-24 | 2013-11-13 | 宗慎平 | Method for stabilizing working current of light emitting diode (LED) power-saving lamp |
| CN101990348A (en) * | 2010-12-03 | 2011-03-23 | 上海嘉塘电子有限公司 | Power switching circuit special for LED and application thereof |
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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: 20100127 Termination date: 20160319 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |