CN201893981U - Light-emitting diode (LED) spotlight drive circuit - Google Patents
Light-emitting diode (LED) spotlight drive circuit Download PDFInfo
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- CN201893981U CN201893981U CN2010206839633U CN201020683963U CN201893981U CN 201893981 U CN201893981 U CN 201893981U CN 2010206839633 U CN2010206839633 U CN 2010206839633U CN 201020683963 U CN201020683963 U CN 201020683963U CN 201893981 U CN201893981 U CN 201893981U
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Abstract
The utility model relates to a light-emitting diode (LED) spotlight drive circuit, which comprises a rectification circuit, a filter circuit and a constant-current drive circuit which are sequentially connected with one another, wherein the rectification circuit is a bridge rectifier circuit which comprises diodes D1, D2, D3 and D4, the rectification circuit rectifies the low voltage alternating current input by an electronic transformer into pulse direct current, the filter circuit comprises a capacitance C1 and a capacitance C2 which are connected in parallel, and a resistor R3 which is connected with the C1 in series, and filters the fluctuation part of the pulse direct current, and the constant-current drive circuit comprises a constant-current drive integrated circuit (IC), a diode D5, an R1 and an R2 which are connected in parallel, and an inductance L1 which is connected with a load LED in series, and is a constant-current power source which can change the voltage along with the variation of the forward voltage drop of an LED. The LED spotlight drive circuit can be compatible to the electronic transformer on the present market, and drive an LEDMR16 spotlight to work, and the utility model has a low cost and stability in operation.
Description
(1) technical field
The utility model relates to a kind of led drive circuit.
(2) background technology
Along with the development of LED technology, brought a revolution on illumination circle.Especially 1W and the maturation of 3W great power LED technology and the reduction of cost, LED is in field extensive uses such as E27, GU10, PAR lamp and MR16.Yet, in the LED-MR16 of the 3*1W that electronic transformer drives uses, also have some problems.With the Philip electronic transformer is example; because the default load of design is resistive load (traditional MR16 halogen spot light is the resistive load characteristic); yet the load characteristic of LED MR16 type shot-light is a capacitive load; will cause like this work in the Philip electronic transformer start the output short circuit protection function owing to the feedback current that obtains is excessive, thereby cause the Philip electronic transformer not work or intermittent work.The result who occurs is exactly that LED MR16 type shot-light point does not work or stroboscopic phenomenon.
(3) summary of the invention
In order to overcome above-mentioned deficiency in the prior art, the utility model provides a kind of can and can make the LED shot-light drive circuit of stabilized illumination such as LED with traditional MR16 electronic transformer coupling on the market.
The technical scheme in the invention for solving the technical problem is:
A kind of LED shot-light drive circuit, comprise the rectification circuit that connects successively, filter circuit and constant-current drive circuit, described rectification circuit is for comprising diode D1, D2, D3, the bridge rectifier of D4, the low-voltage AC that rectification circuit is imported electronic transformer carries out rectification and obtains Rectified alternating current, described filter circuit comprises the C1 that is connected in parallel, C2, also have with C1 be connected in series R3, fluctuation composition in the filter circuit filtering Rectified alternating current, described constant-current drive circuit comprises constant-current driving IC, diode D5, the R1 that is connected in parallel, R2, with the inductance L 1 that load LED is connected in series, described constant-current drive circuit is for changing the constant current source that changes voltage with LED forward voltage drop value.
As preferably, load LED is the MR16 type.
Traditional Halogen lamp LED provides constant pressure source work by the electronic transformer that is coupling between AC power supplies and the Halogen lamp LED, what electronic transformer was exported is low-voltage AC, and the need of driving LED work are direct currents, and then existing electronic transformer can not be compatible with general LED MR16 type shot-light.One LED shot-light drive circuit now is provided, and its central principle is that the feedback current with drive circuit works the time is controlled in the scope that electronic transformer allows, thereby solves electronic transformer owing to the excessive problem that starts output short circuit protection of the feedback current that obtains.Specifically the low-voltage high-frequency alternating current with electronic transformer output is rectified into Rectified alternating current by 4 diode D1, D2, D3, D4, fluctuation composition in capacitor filtering filtering Rectified alternating current then, because the constant-current drive circuit driving LED is comparatively desirable, it is luminous through constant-current driving IC direct current to be driven load LEDMR16 type shot-light with constant current mode output more again.
The beneficial effects of the utility model are: the utility model can be worked low, the working stability of the utility model cost by compatible electronic transformer and driving LED MR16 type shot-light in the market.
(4) description of drawings
Fig. 1 is an electrical block diagram of the present utility model.
(5) embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As shown in Figure 1, a kind of LED shot-light drive circuit, comprise rectification circuit 1, filter circuit 2 and constant-current drive circuit 3, the output of rectification circuit 1 connects filter circuit 2, the output of filter circuit 2 connects constant-current drive circuit 3, and constant-current drive circuit connects load MR16 type LED1, LED2, LED3.Rectification circuit 1 is the bridge rectifier that comprises diode D1, D2, D3, D4, the low-voltage AC that rectification circuit 1 is imported electronic transformer carries out rectification and obtains Rectified alternating current, filter circuit 2 comprises C1, the C2 that is connected in parallel, also have with C1 be connected in series R3, the fluctuation composition in the filter circuit filtering Rectified alternating current.Constant-current drive circuit 3 comprises constant-current driving ICU1, diode D5, and the R1 that is connected in parallel, R2, with the inductance L 1 that load LED1, LED2, LED3 are connected in series, constant-current drive circuit is for changing the constant current source that changes voltage with LED forward voltage drop value.
Traditional Halogen lamp LED provides constant pressure source work by the electronic transformer that is coupling between AC power supplies and the Halogen lamp LED, what electronic transformer was exported is low-voltage AC, and driving LED work is need be direct current, and then existing electronic transformer can not be compatible with general LED MR16 type shot-light.One LED shot-light drive circuit now is provided, the low-voltage high-frequency alternating current of electronic transformer output is rectified into Rectified alternating current by 4 diode D1, D2, D3, D4, then through capacitor filtering with the fluctuation composition in the filtering Rectified alternating current, it is luminous through constant-current driving IC direct current to be driven load LEDMR16 type shot-light with constant current mode output again.
Claims (2)
1. LED shot-light drive circuit, it is characterized in that: comprise the rectification circuit that connects successively, filter circuit and constant-current drive circuit, described rectification circuit is for comprising diode D1, D2, D3, the bridge rectifier of D4, the low-voltage AC that rectification circuit is imported electronic transformer carries out rectification and obtains Rectified alternating current, described filter circuit comprises the C1 that is connected in parallel, C2, also have with C1 be connected in series R3, fluctuation composition in the filter circuit filtering Rectified alternating current, described constant-current drive circuit comprises constant-current driving IC, diode D5, the R1 that is connected in parallel, R2, with the inductance L 1 that load LED is connected in series, described constant-current drive circuit is for changing the constant current source that changes voltage with LED forward voltage drop value.
2. a kind of LED shot-light drive circuit according to claim 1, it is characterized in that: described load LED is the MR16 type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206839633U CN201893981U (en) | 2010-12-16 | 2010-12-16 | Light-emitting diode (LED) spotlight drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206839633U CN201893981U (en) | 2010-12-16 | 2010-12-16 | Light-emitting diode (LED) spotlight drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201893981U true CN201893981U (en) | 2011-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206839633U Expired - Fee Related CN201893981U (en) | 2010-12-16 | 2010-12-16 | Light-emitting diode (LED) spotlight drive circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN201893981U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102932998A (en) * | 2012-11-13 | 2013-02-13 | 镇江路美耐光电科技有限公司 | Power converter |
| CN102958253A (en) * | 2012-09-06 | 2013-03-06 | 金尔富 | Large-power LED (Light-Emitting Diode) universal special power supply |
| WO2015131389A1 (en) * | 2014-03-07 | 2015-09-11 | 深圳市众明半导体照明有限公司 | Mr16 type led spotlight and dimming power source thereof |
| CN107396492A (en) * | 2017-07-18 | 2017-11-24 | 上海奥简微电子科技有限公司 | Led drive circuit |
| CN108770117A (en) * | 2018-05-10 | 2018-11-06 | 四川大学 | A kind of integrated LED drive power of compatible electronic transformer |
-
2010
- 2010-12-16 CN CN2010206839633U patent/CN201893981U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102958253A (en) * | 2012-09-06 | 2013-03-06 | 金尔富 | Large-power LED (Light-Emitting Diode) universal special power supply |
| CN102958253B (en) * | 2012-09-06 | 2015-01-14 | 金尔富 | Large-power LED (Light-Emitting Diode) universal special power supply |
| CN102932998A (en) * | 2012-11-13 | 2013-02-13 | 镇江路美耐光电科技有限公司 | Power converter |
| CN102932998B (en) * | 2012-11-13 | 2014-09-17 | 镇江乐电半导体科技有限公司 | Power converter |
| WO2015131389A1 (en) * | 2014-03-07 | 2015-09-11 | 深圳市众明半导体照明有限公司 | Mr16 type led spotlight and dimming power source thereof |
| CN107396492A (en) * | 2017-07-18 | 2017-11-24 | 上海奥简微电子科技有限公司 | Led drive circuit |
| CN108770117A (en) * | 2018-05-10 | 2018-11-06 | 四川大学 | A kind of integrated LED drive power of compatible electronic transformer |
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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: 20110706 Termination date: 20141216 |
|
| EXPY | Termination of patent right or utility model |