CN106211468B - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN106211468B CN106211468B CN201610697360.0A CN201610697360A CN106211468B CN 106211468 B CN106211468 B CN 106211468B CN 201610697360 A CN201610697360 A CN 201610697360A CN 106211468 B CN106211468 B CN 106211468B
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a kind of LED drive circuit, LED drive circuit includes EMI protection circuit, current rectifying and wave filtering circuit, the constant-current circuit being sequentially connected, the input termination AC power of EMI protection circuit, the output terminating load LED of constant-current circuit, the constant-current circuit includes regulation circuit and sampling feedback circuit, the regulation circuit is used for the regulation of voltage and current, and the sampling feedback circuit is used to give output voltage and current feedback to regulation circuit.By the scheme of the application, circuit performance is stable, and work long hours the electrical property for remaining to keep good, can extend the service life of LED drive circuit.
Description
Technical field
The invention belongs to LED field, more particularly to a kind of LED drive circuit.
Background technology
LED illumination is a kind of new type light source of rapid rising development in recent years, and its many good features cause answering for it
It is more and more wider with face.LED is a kind of extremely long electric light source of life-span, and service life can reach 100,000 hours, but in practical application
In, the actual life of LED is not high, or even some was just damaged less than 1 year.This is due to that LED unilateal conduction is special
Property, which makes LED must be equipped with LED drive circuit, to work, and the reliability of LED drive circuit is not high, and driveability is bad.Mesh
It is preceding in field of LED drive, generally use constant-current drive circuit LED is kept constant operating current at work to reach LED
Luminous stability and extension LED service life, but existing constant-current drive circuit has certain limitation in actual applications
Property, the more stable occasion of line voltage can only be adapted to.
The content of the invention
Goal of the invention：To solve the problems, such as that prior art is present, the luminous stability of LED is improved, the present invention provides a kind of
LED drive circuit.
Technical scheme：A kind of LED drive circuit, the LED drive circuit include the EMI protection circuit, whole being sequentially connected
Stream filter circuit, constant-current circuit, the input termination AC power of EMI protection circuit, the output terminating load LED of constant-current circuit,
The constant-current circuit includes regulation circuit and sampling feedback circuit, and the regulation circuit is used for the regulation of voltage and current, described
Sampling feedback circuit is used to give output voltage and current feedback to regulation circuit.
Further, regulation circuit includes DC-DC control chips U1 and peripheral circuit, one end of the armature winding of transformer
The output head anode of current rectifying and wave filtering circuit is connect, another termination metal-oxide-semiconductor Q2 of armature winding drain electrode, metal-oxide-semiconductor Q2 drain electrode is through two
Pole pipe D3, resistance R5 are followed by the output head anode of current rectifying and wave filtering circuit, and electric capacity C5 is attempted by resistance R5 both ends, time of transformer
The anode that exports terminating load LED of the one end of level winding after diode D4 as constant-current circuit, diode D5 are attempted by two
Pole pipe D4 both ends, the other end ground connection of the secondary windings of transformer, a termination rectifying and wave-filtering electricity of the assists winding of transformer
The negative pole of output end on road, another terminating diode D1 anode, diode D1 negative electrode connect triode Q1 colelctor electrode, diode
D1 negative electrode connects the negative pole of output end of current rectifying and wave filtering circuit through electric capacity C7, and triode Q1 base stage connects rectification through voltage-regulator diode D2
The negative pole of output end of filter circuit, triode Q1 base stage connect triode Q1 colelctor electrode, chip U1 Enable Pin through resistance R2
The output head anode of current rectifying and wave filtering circuit is connect, chip U1 compensating end connects the negative pole of output end of current rectifying and wave filtering circuit through electric capacity C2,
Chip U1 feedback termination optocoupler OC output end, the output end of optocoupler OC input termination sampling feedback circuit, chip U1's
First earth terminal is grounded, and chip U1 overcurrent protection end is divided into three tunnels, and the first via connects the output of current rectifying and wave filtering circuit through resistance R1
Rectify pole, the second tunnel connects the negative pole of output end of current rectifying and wave filtering circuit through electric capacity C4, and the 3rd tunnel connects metal-oxide-semiconductor Q2 source through resistance R3
Pole, chip U1 output end connect metal-oxide-semiconductor Q2 grid through resistance R4, and chip U1 the second ground connection terminates the defeated of current rectifying and wave filtering circuit
Go out and hold negative pole, chip U1 power input is divided into two-way, connects the negative pole of output end of current rectifying and wave filtering circuit through electric capacity C3 all the way, separately
Triode Q1 emitter stage is connect all the way.
Further, sampling feedback circuit includes Current Voltage feedback chip U2 and peripheral circuit, feedback chip U2's
Power input terminates the output end of constant-current circuit, feedback chip U2 output termination optocoupler OC input, resistance R9, resistance
Overall in parallel with load LED after R10, resistance R11 concatenation, feedback chip U2 voltage sample is terminated at resistance R9 and resistance R10
Tie point, feedback chip U2 current sample is terminated at resistance R10 and resistance R11 tie point, and resistance R10 and resistance
R11 tie point is grounded through resistance R12.
Further, EMI protection circuit is three-level protection circuit.The EMI protection circuit includes the common mode being connected in series
Inductance L21, common mode inductance L22, common mode inductance L23, common mode inductance L21 input termination alternating current, common mode inductance L23 output
Termination rectification circuit, electric capacity C21 and electric capacity C22 sequential circuit, resistance R21, electric capacity C23 are attempted by alternating current and common mode successively
Between inductance L21 input, electric capacity C24, resistance R22, electric capacity C25 and electric capacity C26 sequential circuit are attempted by common mode successively
Between inductance L21 output end and common mode inductance L22 input, electric capacity C27, electric capacity C28 and electric capacity C29 sequential circuit,
Resistance R23 is attempted by between common mode inductance L22 output end and common mode inductance L23 input successively, and electric capacity C30 is attempted by altogether
Between mould inductance L23 output end and the input of rectification circuit, electric capacity C21 and electric capacity C22 tie point is grounded, electric capacity C25
It is grounded with electric capacity C26 tie point after common mode inductance L24, electric capacity C28 and electric capacity C29 tie point is grounded.
Further, current rectifying and wave filtering circuit includes rectifier bridge and filter circuit, and filter circuit includes electric capacity C1, electric capacity C1's
The output head anode of one termination rectifier bridge, other end ground connection.
Beneficial effect：Compare prior art, and the present invention in constant-current circuit by designing regulation circuit and sampling feedback
Circuit, the electric current and voltage of circuit output can be adjusted in real time, to reach the effect of constant current driving；EMI protection circuit uses three
Level safeguard procedures, can filter out noise jamming to greatest extent, circuit integrity can be stablized in addition, work long hours and remain to keep good
Good electrical property, the service life of LED drive circuit can be extended.
Brief description of the drawings
Fig. 1 shows that the circuit of the present invention forms block diagram.
Fig. 2 shows the circuit diagram of the present invention.
Fig. 3 shows the EMI circuit diagrams of the present invention.
Embodiment
Technical scheme is further illustrated below in conjunction with Figure of description and specific embodiment.It should be appreciated that this
The specific embodiment of place description is not intended to limit the present invention only to explain the present invention.
Reference picture 1, the LED drive circuit include EMI protection circuit, current rectifying and wave filtering circuit, the constant-current circuit being sequentially connected,
The input termination AC power of EMI protection circuit, the output terminating load LED of constant-current circuit.
Reference picture 2, the composition figure of LED drive circuit is specifically depicted, wherein constant-current circuit includes regulation circuit and sampling
Feedback circuit, the regulation circuit are used for the regulation of voltage and current, and the sampling feedback circuit is used for output voltage and electricity
Stream feeds back to regulation circuit.
Regulation circuit includes DC-to-dc (DC-DC) control chip U1 and peripheral circuit, and the chip U1 in the present embodiment is adopted
DK806, can also use it may occur to persons skilled in the art that other have above-mentioned functional pin DC-DC control
Chip.The output head anode of one termination current rectifying and wave filtering circuit of the armature winding of transformer, another termination metal-oxide-semiconductor of armature winding
Q2 drain electrode, metal-oxide-semiconductor Q2 drain electrode are followed by the output head anode of current rectifying and wave filtering circuit through diode D3, resistance R5, and electric capacity C5 is simultaneously
It is connected on resistance R5 both ends, the output terminating load of one end of the secondary windings of transformer after diode D4 as constant-current circuit
LED anode, diode D5 are attempted by diode D4 both ends, and the other end of the secondary windings of transformer is grounded, transformer
The negative pole of output end of one termination current rectifying and wave filtering circuit of assists winding, another terminating diode D1 anode, diode D1 the moon
Pole connects triode Q1 colelctor electrode, and diode D1 negative electrode connects the negative pole of output end of current rectifying and wave filtering circuit, triode through electric capacity C7
Q1 base stage connects the negative pole of output end of current rectifying and wave filtering circuit through voltage-regulator diode D2, and triode Q1 base stage connects three poles through resistance R2
Pipe Q1 colelctor electrode, chip U1 Enable Pin 1 connect the output head anode of current rectifying and wave filtering circuit, and chip U1 compensating end 2 is through electric capacity
C2 connects the negative pole of output end of current rectifying and wave filtering circuit, and chip U1 feedback end 3 connects optocoupler OC output end, optocoupler OC input termination
The output end of sampling feedback circuit, chip U1 the first earth terminal 4 are grounded, the chip U1 tunnels of 5 Fen Wei of overcurrent protection end tri-, and first
Road connects the output head anode of current rectifying and wave filtering circuit through resistance R1, and the output end that the second tunnel connects current rectifying and wave filtering circuit through electric capacity C4 is born
Pole, the 3rd tunnel connect metal-oxide-semiconductor Q2 source electrode through resistance R3, and chip U1 output end 6 connects metal-oxide-semiconductor Q2 grid, chip through resistance R4
U1 the second earth terminal 7 connects the negative pole of output end of current rectifying and wave filtering circuit, and chip U1 power input 8 divides for two-way, passes through all the way
Electric capacity C3 connects the negative pole of output end of current rectifying and wave filtering circuit, and another way connects triode Q1 emitter stage.
Sampling feedback circuit includes Current Voltage feedback chip U2 and peripheral circuit, and Current Voltage feedback chip U2 is same
When there is the Current Voltage of voltage detecting and current detecting to feed back chip, feedback chip U2 power input 1 connects constant-current circuit
Output end, feedback chip U2 output end 2 connects optocoupler OC input, overall after resistance R9, resistance R10, resistance R11 concatenations
In parallel with load LED, feedback chip U2 voltage sampling port 3 is connected to resistance R9 and resistance R10 tie point, feedback chip U2's
Current sampling port 4 is connected to resistance R10 and resistance R11 tie point, and resistance R10 and resistance R11 tie point connects through resistance R12
Ground.
Sampling feedback circuit real-time sampling adjusts the electric current and voltage of circuit output, and compared with a reference value, simultaneously
According to result of the comparison, feedback output is produced, and the feedback of DC-DC control chips U1 in regulation circuit is transferred to by optocoupler OC
End 3, DC-DC control chips U1 can control the output of metal-oxide-semiconductor according to the result of feedback, so as to adjust the defeated of regulation circuit
Go out, to reach the effect of constant current driving.In addition at the beginning of the DC-DC control chips U1 real-time sampling of overcurrent protection end 5 flows through transformer
The electric current of level winding, in the situation that circuital current is larger, can control DC-DC control chips U1 to be stopped or reduce MOS
Pipe Q2 turn-on cycle, to reach the effect of protection circuit.
EMI protection circuit is three-level protection circuit, and as Fig. 3 is shown, the EMI protection circuit includes the common mode being connected in series
Inductance L21, common mode inductance L22, common mode inductance L23, common mode inductance L21 input termination alternating current, common mode inductance L23 output
Termination rectification circuit, electric capacity C21 and electric capacity C22 sequential circuit, resistance R21, electric capacity C23 are attempted by alternating current and common mode successively
Between inductance L21 input, electric capacity C24, resistance R22, electric capacity C25 and electric capacity C26 sequential circuit are attempted by common mode successively
Between inductance L21 output end and common mode inductance L22 input, electric capacity C27, electric capacity C28 and electric capacity C29 sequential circuit,
Resistance R23 is attempted by between common mode inductance L22 output end and common mode inductance L23 input successively, and electric capacity C30 is attempted by altogether
Between mould inductance L23 output end and the input of rectification circuit, electric capacity C21 and electric capacity C22 tie point is grounded, electric capacity C25
It is grounded with electric capacity C26 tie point after common mode inductance L24, electric capacity C28 and electric capacity C29 tie point is grounded.Prevented by three-level
Shield measure, noise jamming can be filtered out to greatest extent, improve circuit stability.
Described above be only it is illustrative, and it is to be understood that it is described herein arrangement and details modification and
Change will be apparent to those skilled in the art.It is therefore intended that only by scope of the following claims rather than by
The specific detail that is presented limits by way of above description and explaining.
Claims (4)
- A kind of 1. LED drive circuit, it is characterised in that：The LED drive circuit includes the EMI protection circuit, whole being sequentially connected Stream filter circuit, constant-current circuit, the input termination AC power of EMI protection circuit, the output terminating load LED of constant-current circuit, The constant-current circuit includes regulation circuit and sampling feedback circuit, and the regulation circuit is used for the regulation of voltage and current, described Sampling feedback circuit is used to give output voltage and current feedback to regulation circuit；Regulation circuit includes DC-DC control chips U1 and peripheral circuit, a termination rectifying and wave-filtering electricity of the armature winding of transformer The output head anode on road, another termination metal-oxide-semiconductor Q2 of armature winding drain electrode, metal-oxide-semiconductor Q2 drain electrode is through diode D3, resistance R5 The output head anode of current rectifying and wave filtering circuit is followed by, electric capacity C5 is attempted by resistance R5 both ends, one end of the secondary windings of transformer The anode for exporting terminating load LED after diode D4 as constant-current circuit, diode D5 are attempted by diode D4 both ends, The other end ground connection of the secondary windings of transformer, the output end of a termination current rectifying and wave filtering circuit of the assists winding of transformer are born Pole, another terminating diode D1 anode, diode D1 negative electrode connect triode Q1 colelctor electrode, and diode D1 negative electrode is through electricity Hold the negative pole of output end that C7 connects current rectifying and wave filtering circuit, triode Q1 base stage connects the defeated of current rectifying and wave filtering circuit through voltage-regulator diode D2 Go out and hold negative pole, triode Q1 base stage connects triode Q1 colelctor electrode, chip U1 enabled termination rectifying and wave-filtering electricity through resistance R2 The output head anode on road, chip U1 compensating end connect the negative pole of output end of current rectifying and wave filtering circuit, chip U1 feedback through electric capacity C2 Terminate optocoupler OC output end, the output end of optocoupler OC input termination sampling feedback circuit, chip U1 the first ground connection termination Ground, chip U1 overcurrent protection end are divided into three tunnels, and the first via connects the output head anode of current rectifying and wave filtering circuit, the second tunnel through resistance R1 The negative pole of output end of current rectifying and wave filtering circuit is connect through electric capacity C4, the 3rd tunnel connects metal-oxide-semiconductor Q2 source electrode, chip U1 output through resistance R3 End meets metal-oxide-semiconductor Q2 grid, the negative pole of output end of chip U1 the second ground connection termination current rectifying and wave filtering circuit, chip U1 through resistance R4 Power input be divided into two-way, the negative pole of output end of current rectifying and wave filtering circuit is connect through electric capacity C3 all the way, another way meets triode Q1 Emitter stage；Sampling feedback circuit includes Current Voltage feedback chip U2 and peripheral circuit, and feedback chip U2 power input termination is permanent The output end of current circuit, feedback chip U2 output termination optocoupler OC input, resistance R9, resistance R10, resistance R11 concatenations Overall in parallel with load LED afterwards, feedback chip U2 voltage sample is terminated at resistance R9 and resistance R10 tie point, feeds back core Piece U2 current sample is terminated at resistance R10 and resistance R11 tie point, and resistance R10 and resistance R11 tie point is through resistance R12 is grounded.
- 2. LED drive circuit according to claim 1, it is characterised in that：EMI protection circuit is three-level protection circuit.
- 3. LED drive circuit according to claim 2, it is characterised in that：The EMI protection circuit includes what is be connected in series Common mode inductance L21, common mode inductance L22, common mode inductance L23, common mode inductance L21 input termination alternating current, common mode inductance L23's Output termination rectification circuit, electric capacity C21 and electric capacity C22 sequential circuit, resistance R21, electric capacity C23 be attempted by successively alternating current with Between common mode inductance L21 input, electric capacity C24, resistance R22, electric capacity C25 and electric capacity C26 sequential circuit are attempted by successively Between common mode inductance L21 output end and common mode inductance L22 input, electric capacity C27, electric capacity C28 and electric capacity C29 concatenation electricity Road, resistance R23 are attempted by between common mode inductance L22 output end and common mode inductance L23 input successively, and electric capacity C30 simultaneously connects Between common mode inductance L23 output end and the input of rectification circuit, electric capacity C21 and electric capacity C22 tie point is grounded, electric capacity C25 and electric capacity C26 tie point is grounded after common mode inductance L24, and electric capacity C28 and electric capacity C29 tie point is grounded.
- 4. LED drive circuit according to claim 1, it is characterised in that：Current rectifying and wave filtering circuit includes rectifier bridge and filtering Circuit, filter circuit include electric capacity C1, the output head anode of an electric capacity C1 termination rectifier bridge, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610697360.0A CN106211468B (en) | 2016-08-19 | 2016-08-19 | A kind of LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610697360.0A CN106211468B (en) | 2016-08-19 | 2016-08-19 | A kind of LED drive circuit |
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| Publication Number | Publication Date |
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| CN106211468A CN106211468A (en) | 2016-12-07 |
| CN106211468B true CN106211468B (en) | 2018-02-02 |
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| CN201610697360.0A Expired - Fee Related CN106211468B (en) | 2016-08-19 | 2016-08-19 | A kind of LED drive circuit |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592702B (en) * | 2017-09-18 | 2024-04-09 | 佛山市国星光电股份有限公司 | Power regulating circuit and LED lamp driving device |
| CN108901100B (en) * | 2018-07-17 | 2020-07-28 | 浙江金来奥光电科技有限公司 | Constant current power supply driving system capable of stably lighting multiple L ED lamp beads |
| CN110996442A (en) * | 2019-12-04 | 2020-04-10 | 江西洪都航空工业集团有限责任公司 | LED drive circuit |
| CN112218407B (en) * | 2020-08-27 | 2023-04-18 | 盐城工学院 | LED drive circuit without drive chip |
| CN114173460A (en) * | 2021-11-19 | 2022-03-11 | 深圳市多思迈光电有限公司 | Lamp control circuit and controller |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203340336U (en) * | 2013-03-04 | 2013-12-11 | 江南大学 | LED driving power and light modulation system |
| CN104066244A (en) * | 2014-06-16 | 2014-09-24 | 上海大学 | Universal LED simulation dimming circuit |
| CN204518147U (en) * | 2015-03-18 | 2015-07-29 | 盐城工学院 | A kind of LED drive circuit |
| CN105451391A (en) * | 2015-12-17 | 2016-03-30 | 盐城工学院 | LED driving circuit and lamp |
| CN105578641A (en) * | 2015-12-17 | 2016-05-11 | 盐城工学院 | LED light fixture |
| CN206024166U (en) * | 2016-08-19 | 2017-03-15 | 盐城工学院 | A kind of LED drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090267523A1 (en) * | 2008-04-24 | 2009-10-29 | Articulated Technologies, Llc | Driver circuit for light sheet module with direct connection to power source |
-
2016
- 2016-08-19 CN CN201610697360.0A patent/CN106211468B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203340336U (en) * | 2013-03-04 | 2013-12-11 | 江南大学 | LED driving power and light modulation system |
| CN104066244A (en) * | 2014-06-16 | 2014-09-24 | 上海大学 | Universal LED simulation dimming circuit |
| CN204518147U (en) * | 2015-03-18 | 2015-07-29 | 盐城工学院 | A kind of LED drive circuit |
| CN105451391A (en) * | 2015-12-17 | 2016-03-30 | 盐城工学院 | LED driving circuit and lamp |
| CN105578641A (en) * | 2015-12-17 | 2016-05-11 | 盐城工学院 | LED light fixture |
| CN206024166U (en) * | 2016-08-19 | 2017-03-15 | 盐城工学院 | A kind of LED drive circuit |
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| CN106211468A (en) | 2016-12-07 |
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