CN204119573U - 5w led drive circuit - Google Patents
5w led drive circuit Download PDFInfo
- Publication number
- CN204119573U CN204119573U CN201420565448.3U CN201420565448U CN204119573U CN 204119573 U CN204119573 U CN 204119573U CN 201420565448 U CN201420565448 U CN 201420565448U CN 204119573 U CN204119573 U CN 204119573U
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- transformer
- resistance
- electric capacity
- former limit
- drive circuit
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a kind of 5W LED drive circuit, relate to the device technique field for general electric light source.Described drive circuit comprises resistance R1-R10, electric capacity C1-C5, diode D1, rectifier bridge D2, diode D3-D4, transformer T2, inductance L 1 and integrating control chip RM3252.Described drive circuit is by using RM3252 integrating control chip, and design suitable connected peripheral circuit, make input power when 90V ~ 264V, still keep output voltage in the scope of 5V ± 5 ﹪, constant voltage, constant current are effective, and circuit structure is simple, volume is little, low cost of manufacture, long service life, is very applicable to low-power LED.
Description
Technical field
The utility model relates to the device technique field for general electric light source, particularly relates to a kind of 5W LED drive circuit.
Background technology
LED drive power is that power supply supply is converted to specific electric current and voltage with the power supply changeover device of driving LED luminescence, under normal circumstances: the input of LED drive power comprises high pressure industrial frequency AC (i.e. civil power), low-voltage direct, high voltage direct current, low-voltage high-frequency interchange (output as electronic transformer) etc.
By type of drive
(1) electric current that constant current mode: a, constant-current drive circuit export is constant, and the direct voltage exported changes within the specific limits along with varying in size of load resistance, and load resistance is little, and output voltage is just low, and load resistance is larger, and output voltage is also higher; Load short circuits is not afraid of by b, constant-current circuit, but forbids load to be opened a way completely.C, constant-current drive circuit driving LED are ideal, but price is higher comparatively speaking.D, should note used maximumly bearing electric current and magnitude of voltage, which limit the usefulness the usage quantity of LED;
(2) type voltage regulation: a, after the parameters in voltage stabilizing circuit is determined, the voltage of output is fixing, and the electric current exported changes along with the increase and decrease of load; B, voltage stabilizing circuit are not afraid of load open circuit, but forbid load dead short circuit.C, with voltage stabilizing drive circuit driving LED, often to need to add that suitable resistive square can make often to go here and there LED display brightness average for string; The voltage variations affect that d, brightness can come by rectification.
The structure of existing LED drive circuit is comparatively complicated, and manufacturing cost is high, and constant current effect is bad, causes the drive circuit life-span lower.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of 5W LED drive circuit, and described drive circuit has constant voltage, constant current is effective, and circuit structure is simple, and volume is little, low cost of manufacture, long service life, is applicable to very much the feature of low-power LED.
For solving the problems of the technologies described above, technical solution adopted in the utility model is: a kind of 5W LED drive circuit, it is characterized in that: the power input of described drive circuit connects civil power, civil power is through the laggard line output of rectifier bridge D2 rectification, an output head grounding of rectifier bridge D2, the first via of another output of rectifier bridge D2 is through electric capacity C1 ground connection, and the second tunnel connects the negative pole on the former limit of transformer T2 first through inductance L 1; The positive pole on the former limit of transformer T2 first is divided into two-way, the first via is connected with the collector electrode of triode Q1, second tunnel is divided into two-way through diode D1 again, and wherein a road is connected with the negative pole on the former limit of transformer T2 first through electric capacity C3, and another road is connected with the negative pole on the former limit of transformer T2 first through resistance R4; One end ground connection of electric capacity C2, the negative pole on the former limit of another termination transformer T2 first; One end ground connection of electric capacity C7, the other end connects the negative pole on the former limit of transformer T2 first successively through resistance R3, resistance R2; The minus earth on the former limit of transformer T2 second, the positive pole on the former limit of transformer T2 second is through the node of diode D3 connecting resistance R3 and electric capacity C7; 1 pin and 4 pin of integrating control chip U1 are unsettled, 2 pin ground connection, and 3 pin are divided into two-way, and wherein a road connects the emitter of triode Q1 through resistance R6, and another road connects the negative pole on the former limit of transformer T2 first through resistance R5; 5 pin of integrating control chip U1 connect the base stage of triode Q1, the node of 6 pin connecting resistance R3 and electric capacity C7; The emitter of triode Q1 is divided into two-way, and the first via is through resistance R7 ground connection, and the second tunnel is through resistance R8 ground connection; The positive pole of transformer T2 secondary is connected with the cathode output end of described drive circuit through diode D4, and resistance R9 and electric capacity C5 is in parallel with diode D4 after connecting; Described electric capacity C4, electric capacity C6 are connected with the negative pole of diode D4 with one end of resistance R10, and electric capacity C4, electric capacity C6 are connected with the negative pole of transformer T2 secondary with the other end of resistance R10.
Further technical scheme is: described integrating control chip U1 is RM3253.
The beneficial effect adopting technique scheme to produce is: described drive circuit is by using RM3252 integrating control chip, and design suitable connected peripheral circuit, make input power when 90V ~ 264V, still keep output voltage in the scope of 5V ± 5 ﹪, constant voltage, constant current are effective, and circuit structure is simple, volume is little, low cost of manufacture, long service life, is applicable to the feature of low-power LED very much.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Set forth a lot of detail in the following description so that fully understand the utility model, but the utility model can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when doing similar popularization without prejudice to when the utility model intension, and therefore the utility model is by the restriction of following public specific embodiment.
As shown in Figure 1, the utility model discloses a kind of 5W LED drive circuit, the power input of described drive circuit connects civil power, civil power is through the laggard line output of rectifier bridge D2 rectification, an output head grounding of rectifier bridge D2, the first via of another output of rectifier bridge D2 is through electric capacity C1 ground connection, and the second tunnel connects the negative pole on the former limit of transformer T2 first through inductance L 1; The positive pole on the former limit of transformer T2 first is divided into two-way, the first via is connected with the collector electrode of triode Q1, second tunnel is divided into two-way through diode D1 again, and wherein a road is connected with the negative pole on the former limit of transformer T2 first through electric capacity C3, and another road is connected with the negative pole on the former limit of transformer T2 first through resistance R4; One end ground connection of electric capacity C2, the negative pole on the former limit of another termination transformer T2 first; One end ground connection of electric capacity C7, the other end connects the negative pole on the former limit of transformer T2 first successively through resistance R3, resistance R2; The minus earth on the former limit of transformer T2 second, the positive pole on the former limit of transformer T2 second is through the node of diode D3 connecting resistance R3 and electric capacity C7;
Integrating control chip U1 uses RM3253 type integrating control chip, 1 pin and 4 pin of integrating control chip U1 are unsettled, 2 pin ground connection, and 3 pin are divided into two-way, wherein a road connects the emitter of triode Q1 through resistance R6, and another road connects the negative pole on the former limit of transformer T2 first through resistance R5; 5 pin of integrating control chip U1 connect the base stage of triode Q1, the node of 6 pin connecting resistance R3 and electric capacity C7; The emitter of triode Q1 is divided into two-way, and the first via is through resistance R7 ground connection, and the second tunnel is through resistance R8 ground connection; The positive pole of transformer T2 secondary is connected with the cathode output end of described drive circuit through diode D4, and resistance R9 and electric capacity C5 is in parallel with diode D4 after connecting; Described electric capacity C4, electric capacity C6 are connected with the negative pole of diode D4 with one end of resistance R10, and electric capacity C4, electric capacity C6 are connected with the negative pole of transformer T2 secondary with the other end of resistance R10.
Operation principle: when input voltage reaches the starting resistor of integrating control chip U1, integrating control chip U1 exports the voltage of a constant current, and by connected peripheral components, voltage is stablized, control the conducting of triode Q1, the former limit of transformer T2 is made to obtain stable voltage input, thus making the secondary of transformer T2 sense stable voltage, the electric current of the power output end stable output of described drive circuit then, for driving low-power LED.
To sum up, described drive circuit is by using RM3252 integrating control chip, and design suitable connected peripheral circuit, make input power when 90V ~ 264V, still keep output voltage in the scope of 5V ± 5 ﹪, constant voltage, constant current are effective, and circuit structure is simple, volume is little, low cost of manufacture, long service life, is applicable to the feature of low-power LED very much.
Claims (2)
1. a 5W LED drive circuit, it is characterized in that: the power input of described drive circuit connects civil power, civil power is through the laggard line output of rectifier bridge D2 rectification, an output head grounding of rectifier bridge D2, the first via of another output of rectifier bridge D2 is through electric capacity C1 ground connection, and the second tunnel connects the negative pole on the former limit of transformer T2 first through inductance L 1; The positive pole on the former limit of transformer T2 first is divided into two-way, the first via is connected with the collector electrode of triode Q1, second tunnel is divided into two-way through diode D1 again, and wherein a road is connected with the negative pole on the former limit of transformer T2 first through electric capacity C3, and another road is connected with the negative pole on the former limit of transformer T2 first through resistance R4; One end ground connection of electric capacity C2, the negative pole on the former limit of another termination transformer T2 first; One end ground connection of electric capacity C7, the other end connects the negative pole on the former limit of transformer T2 first successively through resistance R3, resistance R2; The minus earth on the former limit of transformer T2 second, the positive pole on the former limit of transformer T2 second is through the node of diode D3 connecting resistance R3 and electric capacity C7; 1 pin and 4 pin of integrating control chip U1 are unsettled, 2 pin ground connection, and 3 pin are divided into two-way, and wherein a road connects the emitter of triode Q1 through resistance R6, and another road connects the negative pole on the former limit of transformer T2 first through resistance R5; 5 pin of integrating control chip U1 connect the base stage of triode Q1, the node of 6 pin connecting resistance R3 and electric capacity C7; The emitter of triode Q1 is divided into two-way, and the first via is through resistance R7 ground connection, and the second tunnel is through resistance R8 ground connection; The positive pole of transformer T2 secondary is connected with the cathode output end of described drive circuit through diode D4, and resistance R9 and electric capacity C5 is in parallel with diode D4 after connecting; Described electric capacity C4, electric capacity C6 are connected with the negative pole of diode D4 with one end of resistance R10, and electric capacity C4, electric capacity C6 are connected with the negative pole of transformer T2 secondary with the other end of resistance R10.
2. 5W LED drive circuit according to claim 1, is characterized in that: described integrating control chip U1 is RM3253.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420565448.3U CN204119573U (en) | 2014-09-29 | 2014-09-29 | 5w led drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420565448.3U CN204119573U (en) | 2014-09-29 | 2014-09-29 | 5w led drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204119573U true CN204119573U (en) | 2015-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420565448.3U Expired - Fee Related CN204119573U (en) | 2014-09-29 | 2014-09-29 | 5w led drive circuit |
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| Country | Link |
|---|---|
| CN (1) | CN204119573U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197566A (en) * | 2017-07-05 | 2017-09-22 | 佛山杰致信息科技有限公司 | Led drive circuit |
-
2014
- 2014-09-29 CN CN201420565448.3U patent/CN204119573U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107197566A (en) * | 2017-07-05 | 2017-09-22 | 佛山杰致信息科技有限公司 | Led drive circuit |
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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: 20150121 Termination date: 20150929 |
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| EXPY | Termination of patent right or utility model |