CN204741590U - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN204741590U CN204741590U CN201520342991.1U CN201520342991U CN204741590U CN 204741590 U CN204741590 U CN 204741590U CN 201520342991 U CN201520342991 U CN 201520342991U CN 204741590 U CN204741590 U CN 204741590U
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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 LED drive circuit, including rectifier bridge T, resistance R1, electric capacity C1 and diode D3, rectifier bridge T's port 1 linked switch S1, switch S1's the other end connect the 220V alternating current, rectifier bridge T's 3 other ends of connecting the 220V alternating currents of port, rectifier bridge T's port 2 connecting resistance R1, resistance R5, electric capacity C1, electric capacity C3 and polyphase transformer W's winding N1. The utility model discloses LED drive circuit adopts the polyphase transformer as the vary voltage component, through adopt the supplementary power supply winding that just swashs the wire winding form between increase and the secondary in the transformer to the voltage that makes its both ends remains throughout unchangeably, uses power management chip as control chip simultaneously, consequently has simple structure, stable, the effectual advantage of constant current of output.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically a kind of LED drive circuit.
Background technology
LED is acknowledged as green forth generation light source, it is a kind of solid cold light source, have efficient, life-span is long, safety and environmental protection, volume is little, high reliability, the plurality of advantages such as fast response time, at present, in the drive circuit of LED illumination, driving power major part circuit adopts flyback work topology, this Method compare is applicable to the driving power of the constant type of output voltage, but, when output voltage reduces (minimizing of series load quantity), because of power supply winding and the output winding same-phase of driving chip, so supply power voltage also can decline in proportion, after dropping to the minimum operating voltage of chip, electric power no longer normally works, therefore, the load-carrying scope of this circuit is very limited.
Utility model content
The purpose of this utility model is the LED drive circuit providing a kind of structure simple, easy to use, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of LED drive circuit, comprise rectifier bridge T, resistance R1, electric capacity C1 and diode D3, the port one connecting valve S1 of described rectifier bridge T, the other end of switch S 1 connects 220V alternating current, the port 3 of rectifier bridge T connects the other end of 220V alternating current, the port 2 contact resistance R1 of rectifier bridge T, resistance R5, electric capacity C1, the winding N1 of electric capacity C3 and polyphase transformer W, the other end of electric capacity C1 connects electric capacity C2, resistance R6, resistance R8, the winding N2 of polyphase transformer W, the winding N3 of polyphase transformer W and the port 4 of rectifier bridge T also ground connection, the other end contact resistance R2 of resistance R1, resistance R3, the other end of electric capacity C2 and the VIN pin of power management chip IC1, the other end of resistance R2 connects the negative electrode of diode D1, the anode of diode D1 connects the other end of the winding N2 of polyphase transformer W, the other end of resistance R3 connects the negative electrode of diode D2, the anode of diode D2 connects the other end and the resistance R7 of the winding N3 of polyphase transformer W, the other end of other end contact resistance R5 of electric capacity C3 and the negative electrode of diode D3, the anode of diode D3 connects the other end of winding N1 and the drain electrode of metal-oxide-semiconductor Q1 of polyphase transformer W, the SW pin contact resistance R4 of power management chip IC1, the other end of resistance R4 connects the grid of metal-oxide-semiconductor Q1, the other end of FB pin contact resistance R7 of power management chip IC1 and the other end of resistance R8, the other end of the source electrode contact resistance R6 of metal-oxide-semiconductor Q1, one end of the winding N4 of polyphase transformer W connects the anode of electric capacity C4 and diode D4, the negative electrode contact resistance R9 of diode D4, electric capacity C3, resistance R10 and LED group H, the other end of the other end contact resistance R9 of electric capacity C4, the other end of the winding N4 of polyphase transformer W connects the other end of electric capacity C3, the other end of resistance R10 and the other end of LED group H.
As preferred version of the present utility model: the model that described power management chip IC1 sends out is TD1410.
Compared with prior art, the beneficial effects of the utility model are: the utility model LED drive circuit adopts polyphase transformer as transformation element, by increasing the auxiliary power supply winding adopting normal shock coiling form between secondary winding in transformer, remain constant to make the voltage at its two ends, use power management chip as control chip simultaneously, therefore have that structure is simple, advantage that stable output, constant current are effective.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of LED drive circuit.
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 the utility model part embodiment, 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.
Refer to Fig. 1, a kind of LED drive circuit, comprise rectifier bridge T, resistance R1, electric capacity C1 and diode D3, the port one connecting valve S1 of described rectifier bridge T, the other end of switch S 1 connects 220V alternating current, the port 3 of rectifier bridge T connects the other end of 220V alternating current, the port 2 contact resistance R1 of rectifier bridge T, resistance R5, electric capacity C1, the winding N1 of electric capacity C3 and polyphase transformer W, the other end of electric capacity C1 connects electric capacity C2, resistance R6, resistance R8, the winding N2 of polyphase transformer W, the winding N3 of polyphase transformer W and the port 4 of rectifier bridge T also ground connection, the other end contact resistance R2 of resistance R1, resistance R3, the other end of electric capacity C2 and the VIN pin of power management chip IC1, the other end of resistance R2 connects the negative electrode of diode D1, the anode of diode D1 connects the other end of the winding N2 of polyphase transformer W, the other end of resistance R3 connects the negative electrode of diode D2, the anode of diode D2 connects the other end and the resistance R7 of the winding N3 of polyphase transformer W, the other end of other end contact resistance R5 of electric capacity C3 and the negative electrode of diode D3, the anode of diode D3 connects the other end of winding N1 and the drain electrode of metal-oxide-semiconductor Q1 of polyphase transformer W, the SW pin contact resistance R4 of power management chip IC1, the other end of resistance R4 connects the grid of metal-oxide-semiconductor Q1, the other end of FB pin contact resistance R7 of power management chip IC1 and the other end of resistance R8, the other end of the source electrode contact resistance R6 of metal-oxide-semiconductor Q1, one end of the winding N4 of polyphase transformer W connects the anode of electric capacity C4 and diode D4, the negative electrode contact resistance R9 of diode D4, electric capacity C3, resistance R10 and LED group H, the other end of the other end contact resistance R9 of electric capacity C4, the other end of the winding N4 of polyphase transformer W connects the other end of electric capacity C3, the other end of resistance R10 and the other end of LED group H.
The model that described power management chip IC1 sends out is TD1410.
Operation principle of the present utility model is: the auxiliary winding N3 of the polyphase transformer W in circuit is identical with the phase place of secondary winding N4, auxiliary power supply winding N2 is contrary with auxiliary winding N3 phase place, so auxiliary power supply winding N2 is contrary with secondary winding N4 phase place, therefore the voltage of auxiliary power supply winding N2 does not change by the change of output voltage, and its both end voltage remains unchanged.Forward design between this auxiliary power supply winding N2 and secondary winding N4, after the stabilized input voltage of armature winding N1, the output voltage of auxiliary power supply winding N2 is also just determined, so provide stable control voltage signal to power management chip U1.When the LED group number of load changes, circuit also can provide constant electric current for LED group like this.
Claims (2)
1. a LED drive circuit, comprises rectifier bridge T, resistance R1, electric capacity C1 and diode D3, it is characterized in that, the port one connecting valve S1 of described rectifier bridge T, the other end of switch S 1 connects 220V alternating current, the port 3 of rectifier bridge T connects the other end of 220V alternating current, the port 2 contact resistance R1 of rectifier bridge T, resistance R5, electric capacity C1, the winding N1 of electric capacity C3 and polyphase transformer W, the other end of electric capacity C1 connects electric capacity C2, resistance R6, resistance R8, the winding N2 of polyphase transformer W, the winding N3 of polyphase transformer W and the port 4 of rectifier bridge T also ground connection, the other end contact resistance R2 of resistance R1, resistance R3, the other end of electric capacity C2 and the VIN pin of power management chip IC1, the other end of resistance R2 connects the negative electrode of diode D1, the anode of diode D1 connects the other end of the winding N2 of polyphase transformer W, the other end of resistance R3 connects the negative electrode of diode D2, the anode of diode D2 connects the other end and the resistance R7 of the winding N3 of polyphase transformer W, the other end of other end contact resistance R5 of electric capacity C3 and the negative electrode of diode D3, the anode of diode D3 connects the other end of winding N1 and the drain electrode of metal-oxide-semiconductor Q1 of polyphase transformer W, the SW pin contact resistance R4 of power management chip IC1, the other end of resistance R4 connects the grid of metal-oxide-semiconductor Q1, the other end of FB pin contact resistance R7 of power management chip IC1 and the other end of resistance R8, the other end of the source electrode contact resistance R6 of metal-oxide-semiconductor Q1, one end of the winding N4 of polyphase transformer W connects the anode of electric capacity C4 and diode D4, the negative electrode contact resistance R9 of diode D4, electric capacity C3, resistance R10 and LED group H, the other end of the other end contact resistance R9 of electric capacity C4, the other end of the winding N4 of polyphase transformer W connects the other end of electric capacity C3, the other end of resistance R10 and the other end of LED group H.
2. a kind of LED drive circuit according to claim 1, is characterized in that, the model that described power management chip IC1 sends out is TD1410.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520342991.1U CN204741590U (en) | 2015-05-25 | 2015-05-25 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520342991.1U CN204741590U (en) | 2015-05-25 | 2015-05-25 | LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204741590U true CN204741590U (en) | 2015-11-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520342991.1U Expired - Fee Related CN204741590U (en) | 2015-05-25 | 2015-05-25 | LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204741590U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507549A (en) * | 2016-12-29 | 2017-03-15 | 重庆奥海辉龙大数据有限公司 | LED drive power and system |
-
2015
- 2015-05-25 CN CN201520342991.1U patent/CN204741590U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507549A (en) * | 2016-12-29 | 2017-03-15 | 重庆奥海辉龙大数据有限公司 | LED drive power and system |
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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: 20151104 Termination date: 20160525 |