CN204465964U - A kind of multi-channel LED drive circuit - Google Patents
A kind of multi-channel LED drive circuit Download PDFInfo
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- CN204465964U CN204465964U CN201520105464.9U CN201520105464U CN204465964U CN 204465964 U CN204465964 U CN 204465964U CN 201520105464 U CN201520105464 U CN 201520105464U CN 204465964 U CN204465964 U CN 204465964U
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Abstract
The utility model discloses a kind of multi-channel LED drive circuit, comprise chip TN1000, resistance R1, inductance L 1, light-emitting diode D1 and triode Q1.The utility model circuit adopts triode Q1 as driving tube, by the mode of mirror current source, only with a driver module, namely triode Q1 just can drive multiple parallel LED channels, and for each LED channel produces the constant current of needs, circuit structure is simple, function-stable, cost is lower.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically a kind of multi-channel LED drive circuit.
Background technology
In common direct current transducer application, control circuit adopts the power stage be made up of an inductance and an electric capacity, and generates a constant voltage through regulating by the feedback of a resistance pressure-dividing network, thus obtains a constant current by resitstance voltage divider.
Substitute the upper resistance per square in feedback potential-divider network with a LED, i.e. an available constant current tube driving LED through regulating, the electric current flowing through LED equals the below resistance value of reference voltage divided by ground connection of direct current transducer.Although this mode can perform well in single LED channel, it can not be used for driving multiple parallel LED channels, because unmatched LED pressure drop can consume most of electric current in certain LED channel, so, a LED channel can only be lighted; The LED channel that existing multi-channel LED drive circuit adopts multiple driver module parallel drive different mostly, circuit structure is very complicated, and significantly adds cost.
Utility model content
The purpose of this utility model is to provide a kind of multi-channel LED drive circuit adopting a power tube to drive, 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 multi-channel LED drive circuit, comprise chip TN1000, resistance R1, inductance L 1, light-emitting diode D1 and triode Q1, described chip TN1000 pin 1 connects earth resistance R2, chip TN1000 pin 3 connects electric capacity C1 and resistance R1 respectively, the electric capacity C1 other end connects chip TN1000 pin 4 and ground connection, the described resistance R1 other end connects power supply VCC respectively, ground capacity C2, chip TN1000 pin 5, ground capacity C4, chip TN1000 pin 13 and resistance R4, chip TN1000 pin 6 connects chip TN1000 pin 7 respectively, chip TN1000 pin 10, chip TN1000 pin 11 and inductance L 1, chip TN1000 pin 8 connects chip TN1000 pin 9 and ground connection, the chip TN1000 pin 14 contact resistance R4 other end, chip TN1000 pin 15 contact resistance R3, the resistance R3 other end connects ground capacity C3, described chip TN1000 pin 16 is connecting triode Q1 base stage respectively, resistance R6 and earth resistance R7, described inductance L 1 other end connects ground capacity C5 respectively, resistance R5, light-emitting diode D1 positive pole and light-emitting diode D2 positive pole, the resistance R5 other end is connecting triode Q1 emitter respectively, triode Q2 base stage, triode Q3 base stage, triode Q4 base stage and triode Q5 base stage, triode Q1 grounded collector, described resistance R6 other end connecting luminous diode D1 negative pole, described triode Q2 emitter connects earth resistance R8, triode Q2 collector electrode connecting luminous diode D2 negative pole, described triode Q3 emitter connects earth resistance R9, triode Q3 collector electrode connecting luminous diode D3 negative pole, described triode Q4 emitter connects earth resistance R10, triode Q4 collector electrode connecting luminous diode D4 negative pole, described triode Q5 emitter connects earth resistance R11, triode Q5 collector electrode connecting luminous diode D5 negative pole.
As the utility model further scheme: described power supply VCC voltage is 9V.
Compared with prior art, the beneficial effects of the utility model are: the utility model circuit adopts triode Q1 as driving tube, by the mode of mirror current source, only with a driver module, namely triode Q1 just can drive multiple parallel LED channels, and for each LED channel produces the constant current of needs, circuit structure is simple, function-stable, cost is lower.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of multi-channel 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, in the utility model embodiment, a kind of multi-channel LED drive circuit, comprise chip TN1000, resistance R1, inductance L 1, light-emitting diode D1 and triode Q1, chip TN1000 pin 1 connects earth resistance R2, chip TN1000 pin 3 connects electric capacity C1 and resistance R1 respectively, the electric capacity C1 other end connects chip TN1000 pin 4 and ground connection, the resistance R1 other end connects power supply VCC respectively, ground capacity C2, chip TN1000 pin 5, ground capacity C4, chip TN1000 pin 13 and resistance R4, chip TN1000 pin 6 connects chip TN1000 pin 7 respectively, chip TN1000 pin 10, chip TN1000 pin 11 and inductance L 1, chip TN1000 pin 8 connects chip TN1000 pin 9 and ground connection, the chip TN1000 pin 14 contact resistance R4 other end, chip TN1000 pin 15 contact resistance R3, the resistance R3 other end connects ground capacity C3, chip TN1000 pin 16 is connecting triode Q1 base stage respectively, resistance R6 and earth resistance R7, inductance L 1 other end connects ground capacity C5 respectively, resistance R5, light-emitting diode D1 positive pole and light-emitting diode D2 positive pole, the resistance R5 other end is connecting triode Q1 emitter respectively, triode Q2 base stage, triode Q3 base stage, triode Q4 base stage and triode Q5 base stage, triode Q1 grounded collector, resistance R6 other end connecting luminous diode D1 negative pole, triode Q2 emitter connects earth resistance R8, triode Q2 collector electrode connecting luminous diode D2 negative pole, triode Q3 emitter connects earth resistance R9, triode Q3 collector electrode connecting luminous diode D3 negative pole, triode Q4 emitter connects earth resistance R10, triode Q4 collector electrode connecting luminous diode D4 negative pole, triode Q5 emitter connects earth resistance R11, triode Q5 collector electrode connecting luminous diode D5 negative pole.
Power supply VCC voltage is 9V.
Operation principle of the present utility model is: refer to Fig. 1, and this circuit voltage-boosting stage comprises inductance L 1 and electric capacity C5, and first LED channel drive current adjustment of light-emitting diode D1 is at 17mA, and it equals the 0.8V reference voltage of integrated circuit divided by resistance R5, voltage on electric capacity C3 is adjusted to needs to support the upper voltage of light-emitting diode D1 and resistance R6 and resistance R5 to be certain magnitude of voltage of 0.8V, triode Q1 drives the base stage of Q2 ~ Q5, the image current of light-emitting diode D1 is 17mA, triode Q2, Q3, the VBE pressure drop of Q4 and Q5 close to and compensate for the VBE pressure drop of triode Q1, therefore the voltage on resistance R8 ~ R11 is also a constant 0.8V, and light-emitting diode D2 ~ D5 is by the current drives of a constant 17mA, resistance R5 is for making the voltage on electric capacity C3 enough high, make triode Q2 ~ Q5 all can not be saturated.
Claims (2)
1. a multi-channel LED drive circuit, comprise chip TN1000, resistance R1, inductance L 1, light-emitting diode D1 and triode Q1, it is characterized in that, described chip TN1000 pin 1 connects earth resistance R2, chip TN1000 pin 3 connects electric capacity C1 and resistance R1 respectively, the electric capacity C1 other end connects chip TN1000 pin 4 and ground connection, the described resistance R1 other end connects power supply VCC respectively, ground capacity C2, chip TN1000 pin 5, ground capacity C4, chip TN1000 pin 13 and resistance R4, chip TN1000 pin 6 connects chip TN1000 pin 7 respectively, chip TN1000 pin 10, chip TN1000 pin 11 and inductance L 1, chip TN1000 pin 8 connects chip TN1000 pin 9 and ground connection, the chip TN1000 pin 14 contact resistance R4 other end, chip TN1000 pin 15 contact resistance R3, the resistance R3 other end connects ground capacity C3, described chip TN1000 pin 16 is connecting triode Q1 base stage respectively, resistance R6 and earth resistance R7, described inductance L 1 other end connects ground capacity C5 respectively, resistance R5, light-emitting diode D1 positive pole and light-emitting diode D2 positive pole, the resistance R5 other end is connecting triode Q1 emitter respectively, triode Q2 base stage, triode Q3 base stage, triode Q4 base stage and triode Q5 base stage, triode Q1 grounded collector, described resistance R6 other end connecting luminous diode D1 negative pole, described triode Q2 emitter connects earth resistance R8, triode Q2 collector electrode connecting luminous diode D2 negative pole, described triode Q3 emitter connects earth resistance R9, triode Q3 collector electrode connecting luminous diode D3 negative pole, described triode Q4 emitter connects earth resistance R10, triode Q4 collector electrode connecting luminous diode D4 negative pole, described triode Q5 emitter connects earth resistance R11, triode Q5 collector electrode connecting luminous diode D5 negative pole.
2. multi-channel LED drive circuit according to claim 1, is characterized in that, described power supply VCC voltage is 9V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520105464.9U CN204465964U (en) | 2015-02-13 | 2015-02-13 | A kind of multi-channel LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520105464.9U CN204465964U (en) | 2015-02-13 | 2015-02-13 | A kind of multi-channel LED drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204465964U true CN204465964U (en) | 2015-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520105464.9U Expired - Fee Related CN204465964U (en) | 2015-02-13 | 2015-02-13 | A kind of multi-channel LED drive circuit |
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| CN (1) | CN204465964U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552432A (en) * | 2021-07-16 | 2021-10-26 | 四川久远智能消防设备有限责任公司 | Electromagnetic valve, manipulator multiplexing control and online detection circuit and detection method thereof |
-
2015
- 2015-02-13 CN CN201520105464.9U patent/CN204465964U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552432A (en) * | 2021-07-16 | 2021-10-26 | 四川久远智能消防设备有限责任公司 | Electromagnetic valve, manipulator multiplexing control and online detection circuit and detection method thereof |
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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: 20150708 Termination date: 20160213 |
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| CF01 | Termination of patent right due to non-payment of annual fee |