CN205213071U - Intelligence LED lighting drive circuit - Google Patents
Intelligence LED lighting drive circuit Download PDFInfo
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- CN205213071U CN205213071U CN201520983529.XU CN201520983529U CN205213071U CN 205213071 U CN205213071 U CN 205213071U CN 201520983529 U CN201520983529 U CN 201520983529U CN 205213071 U CN205213071 U CN 205213071U
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Abstract
The utility model discloses an intelligence LED lighting drive circuit, including diode D1, one -way silicon controlled rectifier VS, resistance R1, U1 is put to fortune, MOS pipe VR and electric capacity C1, the diode D1 negative pole VCC that connects respectively, one -way silicon controlled rectifier VS's the K utmost point, one -way silicon controlled rectifier VS's the G utmost point, resistance R2, U1's power end and emitting diode LED positive pole are put to fortune, the anodal electric capacity C1 that connects of diode D1, one -way silicon controlled rectifier VS's A utmost point connecting resistance R1, the resistance R2 other end is connection control chip DA1 respectively, U1 homophase end is put to resistance R3 and fortune, the S utmost point and resistance R6 that U1 inverting terminal connects MOS pipe VR are respectively put to fortune, MOS pipe VR's G extremely distinguishes connecting resistance R4 and resistance R5, the U1 output is put to resistance R4 other end connection fortune, MOS pipe VR's D extremely connects the emitting diode LED negative pole through resistance R7. The utility model discloses intelligence LED lighting drive circuit adopts constant current drive, and circuit structure is simple, and is with low costs, small, especially adapted using widely.
Description
Technical field
The utility model relates to a kind of drive circuit, specifically a kind of Intelligent LED lighting drive circuit.
Background technology
In recent years, semiconductor light sources just progressively enters lighting field with the role of novel solid light source.By solid luminescence physics principle, luminous efficiency can close to 100%, have that operating voltage is low, power consumption is little, the response time is short, luminous efficiency is high, shock resistance, long service life, photochromic pure, stable and reliable for performance and low cost and other advantages.Along with the continuous reduction of LED price, improving constantly of luminosity, semiconductor light sources presents application prospect widely in lighting field.The voltage-current characteristic of LED is identical with the voltage-current characteristic of general-purpose diode, the sharply change that will cause forward current compared with minor swing of forward voltage.The size of LED forward current can change with variation of ambient temperature, and environment reaches uniform temperature, and LED allows forward current sharply to reduce; In the case, if still by big current, easily cause LED aging, reduction of service life, therefore LED needs one to have constant temperature, current constant control in application process, has the LED drive system of reliably protecting function.
Utility model content
The purpose of this utility model is to provide a kind of Intelligent LED lighting drive circuit, 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 Intelligent LED lighting drive circuit, comprise diode D1, one-way SCR VS, resistance R1, amplifier U1, metal-oxide-semiconductor VR and electric capacity C1, described diode D1 negative pole connects power supply VCC respectively, the K pole of one-way SCR VS, the G pole of one-way SCR VS, resistance R2, the power end of amplifier U1 and LED positive pole, diode D1 positive pole connects electric capacity C1, the A pole contact resistance R1 of one-way SCR VS, the resistance R2 other end is connection control chip DA1 respectively, resistance R3 and amplifier U1 in-phase end, amplifier U1 end of oppisite phase connects S pole and the resistance R6 of metal-oxide-semiconductor VR respectively, the G pole contact resistance R4 and resistance R5 respectively of metal-oxide-semiconductor VR, the resistance R4 other end connects amplifier U1 output, the D pole of metal-oxide-semiconductor VR is by resistance R7 connecting luminous diode LED negative pole, the resistance R6 other end is the contact resistance R5 other end respectively, amplifier U1 earth terminal, the resistance R3 other end, the resistance R1 other end and the electric capacity C1 other end ground connection.
As further program of the utility model: described amplifier U1 adopts LM358.
As the utility model further scheme: described power supply VCC voltage is 5V.
Compared with prior art, the beneficial effects of the utility model are: the utility model Intelligent LED lighting drive circuit adopts constant current to drive, and circuit structure is simple, and cost is low, and volume is little, is applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of Intelligent LED lighting 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 Intelligent LED lighting drive circuit, comprise diode D1, one-way SCR VS, resistance R1, amplifier U1, metal-oxide-semiconductor VR and electric capacity C1, diode D1 negative pole connects power supply VCC respectively, the K pole of one-way SCR VS, the G pole of one-way SCR VS, resistance R2, the power end of amplifier U1 and LED positive pole, diode D1 positive pole connects electric capacity C1, the A pole contact resistance R1 of one-way SCR VS, the resistance R2 other end is connection control chip DA1 respectively, resistance R3 and amplifier U1 in-phase end, amplifier U1 end of oppisite phase connects S pole and the resistance R6 of metal-oxide-semiconductor VR respectively, the G pole contact resistance R4 and resistance R5 respectively of metal-oxide-semiconductor VR, the resistance R4 other end connects amplifier U1 output, the D pole of metal-oxide-semiconductor VR is by resistance R7 connecting luminous diode LED negative pole, the resistance R6 other end is the contact resistance R5 other end respectively, amplifier U1 earth terminal, the resistance R3 other end, the resistance R1 other end and the electric capacity C1 other end ground connection.
Amplifier U1 adopts LM358.
Power supply VCC voltage is 5V.
Operation principle of the present utility model is: refer to Fig. 1, and this drive circuit belongs to the topological structure of series electric circuit negative feedback, and wherein LED is load, and R6 is sampling resistor.Control to realize tabilized current power supply, the adjustable voltage signal DA1 exported by Single Chip Microcomputer (SCM) system D/A is introduced at the in-phase input end of amplifier U1, become controlled constant-current source, namely reference voltage, sampling resistor R6 is connected at reverse input end, amplifier U1 is operated in profound and negative feedbck state, it coordinates power MOS pipe to follow input reference voltage by feedback, power MOS pipe is connected with the base stage of amplifier U1, be used for increasing drive current, when the in-phase end input voltage of amplifier U1 is constant, due to degenerative existence, ensure that the constant of output voltage, thus make the electric current flowing through LED load be constant current, the output current of constant-current source directly depends on the output voltage of D/A and the ratio of sampling resistor R6, owing to employing amplifier U1 in feedback element, the loop gain of feedback control loop strengthens, depth of feedback strengthens, the output impedance of constant-current drive circuit is very large, meet instructions for use.
Output current and voltage signal DA1 direct relation, amplifier imbalance has same impact with reference voltage to output current, thus the stability of output current, depend on the stability of reference voltage and the offset drift of amplifier U1, select the reference voltage source of high stability as control voltage, and select low drifting operating amplifier, be the important channel of improving this circuit output current stability.The integrated transporting discharging LM358 adopted in circuit, inside include two independently, high-gain, operational amplifier that internal frequency compensates, there is high-gain, advantage that offset voltage influence is little.
In order to obtain stable drive current, improve the photostability of LED, this circuit, by changing the peripheral voltage of constant-current source, utilizes the change of voltage, controls the size of output current.This circuit external control section is core by Single Chip Microcomputer (SCM) system, in conjunction with button input and display screen, by A/D sampled voltage by closed loop feedback compared with input voltage, adjust accordingly, finally changed the DA1 exported by D/A, as the reference input voltage of constant-current source.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technical scheme in each embodiment also through appropriately combined, can form other execution modes that it will be appreciated by those skilled in the art that.
Claims (3)
1. an Intelligent LED lighting drive circuit, comprise diode D1, one-way SCR VS, resistance R1, amplifier U1, metal-oxide-semiconductor VR and electric capacity C1, it is characterized in that, described diode D1 negative pole connects power supply VCC respectively, the K pole of one-way SCR VS, the G pole of one-way SCR VS, resistance R2, the power end of amplifier U1 and LED positive pole, diode D1 positive pole connects electric capacity C1, the A pole contact resistance R1 of one-way SCR VS, the resistance R2 other end is connection control chip DA1 respectively, resistance R3 and amplifier U1 in-phase end, amplifier U1 end of oppisite phase connects S pole and the resistance R6 of metal-oxide-semiconductor VR respectively, the G pole contact resistance R4 and resistance R5 respectively of metal-oxide-semiconductor VR, the resistance R4 other end connects amplifier U1 output, the D pole of metal-oxide-semiconductor VR is by resistance R7 connecting luminous diode LED negative pole, the resistance R6 other end is the contact resistance R5 other end respectively, amplifier U1 earth terminal, the resistance R3 other end, the resistance R1 other end and the electric capacity C1 other end ground connection.
2. Intelligent LED lighting drive circuit according to claim 1, is characterized in that, described amplifier U1 adopts LM358.
3. Intelligent LED lighting drive circuit according to claim 1, is characterized in that, described power supply VCC voltage is 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520983529.XU CN205213071U (en) | 2015-11-27 | 2015-11-27 | Intelligence LED lighting drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520983529.XU CN205213071U (en) | 2015-11-27 | 2015-11-27 | Intelligence LED lighting drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205213071U true CN205213071U (en) | 2016-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520983529.XU Expired - Fee Related CN205213071U (en) | 2015-11-27 | 2015-11-27 | Intelligence LED lighting drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205213071U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604481A (en) * | 2017-02-20 | 2017-04-26 | 王汉忠 | LED linear constant current soft start drive circuit |
-
2015
- 2015-11-27 CN CN201520983529.XU patent/CN205213071U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604481A (en) * | 2017-02-20 | 2017-04-26 | 王汉忠 | LED linear constant current soft start drive circuit |
| CN106604481B (en) * | 2017-02-20 | 2018-04-13 | 王汉忠 | A kind of LED linear constant current soft start 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: 20160504 Termination date: 20161127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |