CN202941010U - Multichannel LED drive circuit - Google Patents
Multichannel LED drive circuit Download PDFInfo
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- CN202941010U CN202941010U CN 201220603460 CN201220603460U CN202941010U CN 202941010 U CN202941010 U CN 202941010U CN 201220603460 CN201220603460 CN 201220603460 CN 201220603460 U CN201220603460 U CN 201220603460U CN 202941010 U CN202941010 U CN 202941010U
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Abstract
The utility model relates to a multichannel LED drive circuit. The multichannel LED drive circuit comprises a control circuit, a reference circuit and a multichannel LED circuit, the reference circuit provides a reference voltage for the multichannel LED circuit, the reference circuit and each branch circuit of and the multichannel LED circuit have a triode respectively, a base electrode of the triode of the reference circuit is connected with a base electrode of the triode of each branch circuit of the multichannel LED circuit, enabling the reference voltage of each branch circuit of the multichannel LED circuit to be consistent with the reference voltage of the reference voltage, an emitting electrode of the triode of each branch circuit of the multichannel LED circuit is connected with a control resistor, and through settings of the control resistor, the current in each branch circuit of the multichannel LED circuit over the LED reaches the required value.
Description
[technical field]
The utility model relates to a kind of drive circuit, especially refers to a kind of drive circuit of LED multi-path.
[background technology]
LED(Light Emitting Diode) light fixture have that the life-span is long, light efficiency is high, shock resistance, low energy consumption etc. advantage, belong to green energy-conserving and environment-protective illumination, now be widely used in the Lumination ﹠ Decoration field, and along with encouragement and the popularization of national governments, the LED lamp is more and more universal and the trend of replacing gradually traditional lighting arranged.
The LED light source demand motive circuit of LED lamp is lighted, and LED light source can be connected with drive circuit.In prior art, drive circuit is generally integrated circuit, is connected to LED light source by an integrated chip and realizes constant current.When LED light source is many, sometimes need the acting in conjunction of LED multi-path light source that colour temperature, brightness of needs etc. are provided.Yet in prior art, if all connecting a drive integrated circult, every paths of LEDs light source can make the power driving circuit high cost.
Therefore, in order to overcome defects, be necessary to provide a kind of improved multipath LED drive circuit.
[utility model content]
The purpose of this utility model is to provide that a kind of cost is low, the much higher paths of LEDs drive circuit of efficient.
to achieve these goals, the utility model adopts following technical scheme: a kind of multipath LED drive circuit, comprise control circuit, reference circuit and LED multi-path circuit, described reference circuit provides a reference voltage for the LED multi-path circuit, each branch road of described reference circuit and LED multi-path circuit all has respectively triode, the base stage of the triode of described reference circuit is connected with the base stage of the triode of each branch road of described LED multi-path circuit, make the reference voltage of each branch road of described LED multi-path circuit and the reference voltage of described reference circuit be consistent, the emitter of the triode of each branch road of described LED multi-path circuit connects controlling resistance, by the setting to described controlling resistance, each branch road of described LED multi-path circuit reaches its needed value by the electric current of LED.
Compared to prior art, the utility model multipath LED drive circuit has following advantage: have the electric current adjustability good, and LED branch road changeable, circuit protection is strong, the branch current difference can be set to satisfy different requirements.
[description of drawings]
Fig. 1 is the schematic diagram of the utility model multipath LED drive circuit.
Fig. 2 is the circuit diagram of the utility model multipath LED drive circuit.
[embodiment]
Shown in seeing figures.1.and.2, the utility model multipath LED drive circuit 500 comprises control circuit 100, reference circuit 200 and LED multi-path circuit 300, provides a reference voltage for LED multi-path circuit 300 after reference circuit 200 loading one voltages.Each branch road of reference circuit 200 and LED multi-path circuit 300 all has respectively triode Q2, Q3, Q4, reference circuit 200 makes LED multi-path circuit 300 and the reference voltage of reference circuit 200 be consistent with triode Q2, Q3, Q4 that LED multi-path circuit 300 is connected by base stage, by for reference circuit 200 and LED multi-path circuit 300 arrange required resistance R 4, R5, R6, make every paths of LEDs circuit reach the electric current that it needs.
The voltage of reference circuit 200 is by first's 102 decisions of transformer L1, and reference circuit 200 also comprises the dropping resistor R1 that is connected with triode Q2 collector electrode, and reference circuit 200 is regulated by dropping resistor R1 with the current/voltage of LED multi-path circuit 300.Reference circuit 200 be connected the paths of LEDs circuit and all comprise respectively controlling resistance R4, R5, the R6 that is connected with the emitter of triode Q2, Q3, Q4, by controlling resistance R4, R5 are set, R6 reaches the required different electric currents of different branch.Reference circuit 200 comprises dropping resistor R1, the triode Q2 that is connected with dropping resistor R1 and controlling resistance R4 successively.Every paths of LEDs circuit comprises LED, the triode Q3 that connects LED and controlling resistance R5 or the R6 of connecting triode successively.
The first 102 of transformer L1 and second portion 103 comprise three pins 1,2,3.The first pin 1 of transformer L1 is connected with LED multi-path circuit 300 by a diode D6, and the first pin 1 of field-effect transistor Q1 connection transformer L1 is with control transformer L1.Filter capacitor C2 connects the second pin 2 of transformer L1, and diode D1 connects the 3rd pin 3 of transformer L1.
In other embodiment, the voltage of reference circuit 200 can not provide by transformer L1 yet, and directly loads a voltage by a direct current power supply, reaches the required reference voltage of reference circuit 200 by selecting suitable dropping resistor R1.
Concrete, with reference to shown in Figure 2, the utility model multipath LED drive circuit 500 is multipath LED constant current drive circuit, it comprises control circuit 100, reference circuit 200 and LED multi-path circuit 300.
Transformer L1 comprises the first, second, third, fourth, the 5th pin 1,2,3,4,5.The second pin 2 of the transformer L1 of reference circuit 200 and LED multi-path circuit 300 access control circuit 100 in parallel, the first, the 3rd pin 1,3 of transformer L1 connects respectively the other end of reference circuit 200 and LED multi-path circuit 300.The 4th pin 4 ground connection of transformer L1, the 5th pin 5 connects the 3rd pin c of control integration circuit 101.
The first pin 1 of transformer L1 is parallel to an inductance L 2 with the field-effect transistor Q1 of control circuit 100, is connected with LED multi-path circuit 300 by wire 10 after then connecting a diode D6 again.Multipath LED drive circuit 500 also comprises capacitor C 1.The second pin 2 of this capacitor C 1 cross-over connection control circuit 100 and transformer L1.
LED multi-path circuit 300 comprises a plurality of branch roads.Take a branch road wherein as example, each branch road comprises resistance R 2, the LEDD2, the D3 that are connected with triode Q3 collector electrode that a triode Q3, an end are connected with triode Q3 base stage and the controlling resistance R5 that is connected with triode Q3 emitter, between the collector electrode and LEDD2, D3 of resistance R 2 other end connecting triode Q3 of base stage.Only design two branch roads in the present embodiment, but in other embodiment, can increase as required the quantity of branch road.The base stage of the triode Q2 of reference circuit 200 is connected with the triode Q3 of each branch road of described LED multi-path circuit, the base stage of Q4.The second pin 2 of the resistance R 5 that the emitter of triode Q3, the Q4 of each branch road connects, the other end of R6 access in parallel transformer.
At first, control integration circuit 101, field-effect transistor Q1, transformer L1, diode D6, resistance R 7 have formed reduction voltage circuit, use the chip of the critical work of reduction voltage circuit to make field-effect transistor Q1 be operated on off state, by detecting the voltage peak signal controlling primary path on resistance R 7, the current effective value of primary path be the desired current flowing of each branch road and, thereby guaranteeing that required current value can not appear surpassing in whole circuit in the process of work large electric current flows through causes damage to LED.During reduction voltage circuit work, when field-effect transistor Q1 opens, electric current charges to inductance after flowing through LED, when field-effect transistor Q1 closes, transformer L1 can discharge via the loop of L2, D6, LED, guarantee that LED is operated in continuous mode, so the visible flicker effects human body of naked eyes can not occur in LED work engineering, the sightless electric current interruption of naked eyes also can not occur affects the LED colour developing.In LED conduction period, it is constant that the electric current of the LED that flows through keeps, and makes the light of LED emission constant, changes without colourity (color).
Then the secondary circuit that is made of diode D1, capacitor C 2, triode Q2, Q3, Q4, resistance R 1, R2, R3, R4, R5, R6 and LED is actual is the loading section of previously described reduction voltage circuit, so the total current that this part is flow through is controlled by the reduction voltage circuit primary path.In the circuit of this part, consisted of proportion current source by triode Q2, Q3, Q4, controlling resistance R4, R5, R6.In first cycle of circuit start, resistance R 2, R3 make triode Q3, Q4 conducting for triode Q3, Q4 provide enough bias currents, circuit can start smoothly, electric current flows through inductance L 1, make the winding between the pin 2,3 of L1 produce induced voltage, the path that is filtered into dropping resistor R1, triode Q2, controlling resistance R4 through capacitor C 2 provides voltage, thereby produces a reference current Ir4 and the base current Ibq3, the Ibq4 that keep Q3, Q4 conducting.Due to the characteristic UQ2be+Ur4=UQ3be+Ur5 of proportion current source, and UQ2be ≈ UQ3be, R4*Ir4=R5*Ir5 as can be known.We can regulate R4, R5 according to reference current Ir4 and obtain required Ir5, thereby control LEDD2, D3 path at Ir5.The resistance of R6 in like manner can be set to determine LEDD4, the electric current I r6 of D5 path.
The utility model is used the electric current that reference current 200 constant voltages are controlled each branch road of LED multi-path circuit, makes to need not each LED branch road and all connect an independent control circuit and come driving LED, can reach again the purpose of LED circuit constant current, and circuit is simple and save cost.
In other embodiment, can increase the LED branch road, only suitable controlling resistance need to be set, can control the more LED branch road of multichannel by the utility model.
Claims (10)
1. multipath LED drive circuit, comprise control circuit, reference circuit and LED multi-path circuit, described reference circuit provides a reference voltage for the LED multi-path circuit, each branch road of described reference circuit and LED multi-path circuit all has respectively triode, the base stage of the triode of described reference circuit is connected with the base stage of the triode of each branch road of described LED multi-path circuit, make the reference voltage of each branch road of described LED multi-path circuit and the reference voltage of described reference circuit be consistent, the emitter of the triode of each branch road of described LED multi-path circuit connects controlling resistance, by the setting to described controlling resistance, each branch road of described LED multi-path circuit reaches its needed value by the electric current of LED.
2. multipath LED drive circuit as claimed in claim 1, described control circuit comprises transformer, described transformer is included as at least described reference circuit and the first of voltage is provided and forms the second portion in loop with described LED multi-path circuit.
3. multipath LED drive circuit as claimed in claim 2, described reference circuit comprises voltage regulator circuit, diode and filter capacitor, the first of described transformer provides voltage by described diode and filter capacitor for described voltage regulator circuit, when making described control circuit close, the reverse voltage of the first of described transformer can not be carried on reference circuit.
4. multipath LED drive circuit as claimed in claim 3, the voltage of described reference circuit is determined by the first of transformer, described reference circuit also comprises the dropping resistor that is connected with transistor collector, and the current/voltage of described reference circuit and LED multi-path circuit is regulated by dropping resistor.
5. multipath LED drive circuit as claimed in claim 2, described transformer comprises first, second, third pin, the second pin of the transformer of described reference circuit and LED multi-path circuit access control circuit in parallel, another two pins of transformer connect respectively the other end of reference circuit and LED multi-path circuit.
6. multipath LED drive circuit as claimed in claim 5, the resistance that the second pin that described control circuit comprises control integration circuit, the field-effect transistor that is connected with described control integration circuit the first pin and control integration circuit and described field-effect transistor parallel connection are connected afterwards, described transformer connects the 3rd pin of control integration circuit.
7. multipath LED drive circuit as claimed in claim 6, the first pin of described transformer and described field-effect transistor are parallel to a diode, and then are connected with the LED multi-path circuit.
8. multipath LED drive circuit as claimed in claim 7, also comprise the electric capacity that jointly is parallel to the second pin of described transformer with controlling resistance one end of reference circuit and LED multi-path circuit, jointly the be connected in parallel other end of diode of described connection transformer the first pin of the end of the LED of each branch road of the described electric capacity other end and described LED multi-path circuit.
9. be connected in parallel respectively the second pin of described transformer of multipath LED drive circuit as claimed in claim 5, the controlling resistance of the controlling resistance of described electric capacity, reference circuit and every paths of LEDs circuit.
10. multipath LED drive circuit as claimed in claim 1, described reference circuit loads a voltage by DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220603460 CN202941010U (en) | 2012-11-15 | 2012-11-15 | Multichannel LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220603460 CN202941010U (en) | 2012-11-15 | 2012-11-15 | Multichannel LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202941010U true CN202941010U (en) | 2013-05-15 |
Family
ID=48325229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220603460 Withdrawn - After Issue CN202941010U (en) | 2012-11-15 | 2012-11-15 | Multichannel LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202941010U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103813576A (en) * | 2012-11-15 | 2014-05-21 | 欧普照明股份有限公司 | Multipath LED (light-emitting diode) driving circuit |
-
2012
- 2012-11-15 CN CN 201220603460 patent/CN202941010U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103813576A (en) * | 2012-11-15 | 2014-05-21 | 欧普照明股份有限公司 | Multipath LED (light-emitting diode) driving circuit |
| WO2014075383A1 (en) * | 2012-11-15 | 2014-05-22 | 欧普照明股份有限公司 | Multiplex led driver circuit |
| CN103813576B (en) * | 2012-11-15 | 2016-12-21 | 欧普照明股份有限公司 | A kind of multipath LED drive circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130515 Effective date of abandoning: 20161019 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |