CN202488811U - Shunt constant current control circuit of LED chip matrix light source - Google Patents
Shunt constant current control circuit of LED chip matrix light source Download PDFInfo
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- CN202488811U CN202488811U CN2012200245575U CN201220024557U CN202488811U CN 202488811 U CN202488811 U CN 202488811U CN 2012200245575 U CN2012200245575 U CN 2012200245575U CN 201220024557 U CN201220024557 U CN 201220024557U CN 202488811 U CN202488811 U CN 202488811U
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- led chip
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Abstract
Provided is a shunt constant current control circuit of a LED chip matrix light source, belonging to the technical field of LED lighting and comprising a LED chip matrix light source shunt L1, a LED constant current driving power source U, resistors R1 and R2, an NMOS pipe Q1, a triode T1 and a stabilivolt D1. An input terminal of the LED constant current driving power source U is in connection with a power grid, and an anode of an output terminal of the LED constant current driving power source U is in connection with an anode terminal of the LED chip matrix light source shunt L1 and one terminal of the resistor R1; a cathode terminal of the LED chip matrix light source shunt L1 is in connection with a D terminal of the NMOS pipe Q1, and an S terminal of the NMOS pipe Q1 is in connection with a terminal of the resistors R2 and a base electrode of the triode T1; a G terminal of the NMOS pipe Q1 is in connection with a collector electrode of the triode T1, a cathode of the stabilivolt D1 and the other terminal of the resistor R1; a cathode of an output terminal of the LED constant current driving power source U, a grounding terminal of the LED constant current driving power source U, the other terminal of the resistor R2, an emitting electrode of the triode T1 and an anode of the stabilivolt D1 are in ground connection. The shunt constant current control circuit has the advantages of a simple structure, low costs and high reliability.
Description
Technical field
The utility model relates to a kind of shunt constant-current control circuit of led chip matrix light source, belongs to the LED lighting technical field
Background technology
(light-emitting diode) lighting device is as a kind of new light sources of high benefit; Because the unrivaled advantage of light fixture of other types such as have that energy consumption is little, the life-span long, safe in utilization, environmental protection and control are flexible, obtained good social recognition and widelyd popularize.And the main cause that influences its life-span is exactly the stability that flows through the led chip electric current except the material of led chip itself and technology in addition, flows through the permanent damages that excessive electric current can cause led chip for a long time.
are because the forward voltage drop curve of the LED of different manufacturers and different batches itself is different; Therefore each total forward voltage drop curve along separate routes can not be identical in the matrix light source of led chip, can not be identical so flow through each electric current along separate routes of parallel connection.At present; In the LED lighting technical field, most of LED driving power that uses is single channel constant current output type, and the structure of light source is a parallelly connected again matrix-type after the LED series connection; When the total current of power supply output was constant, each electric current along separate routes that flows through the LED matrix can not be identical.The branch current that so just causes is excessive, and the branch current that has is too small, wait use a period of time after, the Na Yilu that branch current is big is that light efficiency or life-span all can be influenced, thereby influences the dependability and the life-span of light fixture
Summary of the invention
The purpose of
the utility model is to overcome the deficiency that above-mentioned prior art exists, and a kind of shunt constant-current control circuit of simple in structure, with low cost, led chip matrix light source that reliability is high is provided.
The purpose of
the utility model reaches like this; A kind of shunt constant-current control circuit of led chip matrix light source; It is characterized in that: the shunt L1, LED constant-current driving power supply U, resistance R 1, R2, NMOS pipe Q1, triode T1, the voltage-stabiliser tube D1 that comprise led chip matrix light source; The input of LED constant-current driving power supply U inserts electrical network; The positive pole of the output of LED constant-current driving power supply U connects positive terminal and the end of resistance R 1 of the shunt L1 of led chip matrix light source; The D end of the negative pole termination NMOS pipe Q1 of the shunt L1 of led chip matrix light source; The end of the S terminating resistor R2 of NMOS pipe Q1 and the base stage of triode T1, collector electrode, the negative pole of voltage-stabiliser tube D1 and the other end of resistance R 1 of the G termination triode T1 of NMOS pipe Q1, the earth terminal of the negative pole of the output of LED constant-current driving power supply U, LED constant-current driving power supply U, the other end of resistance R 2, the emitter of triode T1 and the anodal common ground of voltage-stabiliser tube D1.
the utility model is through adopting the said structure design; Make that each electric current along separate routes that flows through led chip matrix light source is identical; Each shunt operating state that therefore can guarantee light source is consistent, thereby effectively increases the dependability and the life-span of light fixture.
Description of drawings
Fig. 1 is the circuit diagram of an embodiment of the utility model.
Embodiment
are please with reference to Fig. 1; A kind of shunt constant-current control circuit of led chip matrix light source; Comprise shunt L1, LED constant-current driving power supply U, resistance R 1, R2, NMOS pipe Q1, triode T1, the voltage-stabiliser tube D1 of led chip matrix light source, in the utility model, the shunt L1 of led chip matrix light source is composed in series by several LED; LED constant-current driving power supply U adopts LLD-20W, and the voltage stabilized range of voltage-stabiliser tube D1 is 10V～18V.The input of LED constant-current driving power supply U inserts electrical network; Convert the 220V alternating current into the 311V direct current; The positive pole of the output of LED constant-current driving power supply U connects positive terminal and the end of resistance R 1 of the shunt L1 of led chip matrix light source; The D end of the negative pole termination NMOS pipe Q1 of the shunt L1 of led chip matrix light source; The end of the S terminating resistor R2 of NMOS pipe Q1 and the base stage of triode T1; Collector electrode, the negative pole of voltage-stabiliser tube D1 and the other end of resistance R 1 of the G termination triode T1 of NMOS pipe Q1, the earth terminal of the negative pole of the output of LED constant-current driving power supply U, LED constant-current driving power supply U, the other end of resistance R 2, the emitter of triode T1 and the anodal common ground of voltage-stabiliser tube D1.
Continue with reference to Fig. 1
; When LED constant-current driving power supply U supplied power to the series loop of led chip, node a place voltage was higher, current flowing resistance R1 and voltage-stabiliser tube D1; Make the voltage of node b remain on about 10V～18V; NMOS pipe Q1 conducting, electric current flows through the shunt L1 of LED matrix light source, behind current sampling resistor R2, arrives ground.
are 0.3A in required continuous current size for example in the present embodiment, and current sampling resistor R2 is under the situation of 2 Ω; When the electric current that flows through resistance R 2 during greater than 0.3A; The voltage of node c is greater than 0.6V, and triode T1 conducting makes node b voltage descend; NMOS pipe Q1 ends, and the electric current that flows through the shunt L1 of led chip matrix light source diminishes.When the electric current that flows through resistance R 2 during less than 0.3A, the voltage of node c is less than 0.6V, and triode T1 ends, and makes node b voltage rise, NMOS pipe Q1 conducting, and the electrorheological of shunt L1 that flows through led chip matrix light source is big, accomplishes the constant current control of primary current thus.
In sum, the technical scheme that the utility model provides has overcome the shortcoming in the prior art, has reached goal of the invention, has embodied the described technique effect of applicant
Claims (1)
1.
A kind of shunt constant-current control circuit of led chip matrix light source; It is characterized in that: the shunt L1, LED constant-current driving power supply U, resistance R 1, R2, NMOS pipe Q1, triode T1, the voltage-stabiliser tube D1 that comprise led chip matrix light source; The input of LED constant-current driving power supply U inserts electrical network; The positive pole of the output of LED constant-current driving power supply U connects positive terminal and the end of resistance R 1 of the shunt L1 of led chip matrix light source; The D end of the negative pole termination NMOS pipe Q1 of the shunt L1 of led chip matrix light source; The end of the S terminating resistor R2 of NMOS pipe Q1 and the base stage of triode T1; Collector electrode, the negative pole of voltage-stabiliser tube D1 and the other end of resistance R 1 of the G termination triode T1 of NMOS pipe Q1, the earth terminal of the negative pole of the output of LED constant-current driving power supply U, LED constant-current driving power supply U, the other end of resistance R 2, the emitter of triode T1 and the anodal common ground of voltage-stabiliser tube D1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200245575U CN202488811U (en) | 2012-01-19 | 2012-01-19 | Shunt constant current control circuit of LED chip matrix light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200245575U CN202488811U (en) | 2012-01-19 | 2012-01-19 | Shunt constant current control circuit of LED chip matrix light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202488811U true CN202488811U (en) | 2012-10-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200245575U Expired - Lifetime CN202488811U (en) | 2012-01-19 | 2012-01-19 | Shunt constant current control circuit of LED chip matrix light source |
Country Status (1)
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| CN (1) | CN202488811U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102595714A (en) * | 2012-01-19 | 2012-07-18 | 江苏好的节能光电科技有限公司 | Shunt constant-current control circuit for LED chip matrix light source |
-
2012
- 2012-01-19 CN CN2012200245575U patent/CN202488811U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102595714A (en) * | 2012-01-19 | 2012-07-18 | 江苏好的节能光电科技有限公司 | Shunt constant-current control circuit for LED chip matrix light source |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121010 |
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| CX01 | Expiry of patent term |