CN106211468A - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN106211468A CN106211468A CN201610697360.0A CN201610697360A CN106211468A CN 106211468 A CN106211468 A CN 106211468A CN 201610697360 A CN201610697360 A CN 201610697360A CN 106211468 A CN106211468 A CN 106211468A
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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]
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Abstract
The invention discloses a kind of LED drive circuit, EMI protection circuit that LED drive circuit includes being sequentially connected with, current rectifying and wave filtering circuit, constant-current circuit, the input termination alternating current power supply of EMI protection circuit, the output terminating load LED of constant-current circuit, described constant-current circuit includes regulating circuit and sampling feedback circuit, described regulation circuit is for the regulation of voltage and current, and described sampling feedback circuit is for giving regulation circuit by output voltage and current feedback.By the scheme of the application, circuit performance is stable, and work long hours the electrical property remaining to keep good, can extend the service life of LED drive circuit.
Description
Technical field
The invention belongs to LED field, particularly relate 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 feature makes answering of it
More and more wider with face.LED is the electric light source extremely grown in a kind of life-span, can reach service life 100,000 hours, but applies in reality
In, the actual life of LED is the highest, and even have just damaged less than 1 year.This is owing to the unilateal conduction of LED is special
Property makes LED must be equipped with LED drive circuit could to work, and the reliability of LED drive circuit is the highest, and driveability is bad.Mesh
Before in field of LED drive, commonly used constant-current drive circuit makes LED operationally keep constant operating current to reach LED
Luminous stability and the service life of prolongation LED, but existing constant-current drive circuit has certain limitation in actual applications
Property, the occasion that line voltage is more stable can only be suitable for.
Summary of the invention
Goal of the invention: for solving the problem that prior art exists, improves the luminous stability of LED, and the present invention provides a kind of
LED drive circuit.
Technical scheme: a kind of LED drive circuit, EMI protection circuit that described LED drive circuit includes being sequentially connected with, whole
Stream filter circuit, constant-current circuit, the input termination alternating current power supply of EMI protection circuit, the output terminating load LED of constant-current circuit,
Described constant-current circuit includes regulating circuit and sampling feedback circuit, and described regulation circuit is for the regulation of voltage and current, described
Sampling feedback circuit is for giving regulation circuit by output voltage and current feedback.
Further, regulation circuit includes DC-DC control chip U1 and peripheral circuit, one end of the armature winding of transformator
Connecing the output head anode of current rectifying and wave filtering circuit, the drain electrode of another termination metal-oxide-semiconductor Q2 of armature winding, the drain electrode of metal-oxide-semiconductor Q2 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 the two ends of resistance R5, transformator time
One end of level winding is as the anode of output terminating load LED of constant-current circuit after diode D4, and diode D5 is attempted by two
The two ends of pole pipe D4, the other end ground connection of the secondary windings of transformator, a termination rectifying and wave-filtering electricity of the auxiliary winding of transformator
The negative pole of output end on road, the anode of another terminating diode D1, the negative electrode of diode D1 connects the colelctor electrode of audion Q1, diode
The negative electrode of D1 connects the negative pole of output end of current rectifying and wave filtering circuit through electric capacity C7, and the base stage of audion Q1 connects rectification through Zener diode D2
The negative pole of output end of filter circuit, the base stage of audion Q1 connects the colelctor electrode of audion Q1, the Enable Pin of chip U1 through resistance R2
Connecing the output head anode of current rectifying and wave filtering circuit, the end that compensates of chip U1 connects the negative pole of output end of current rectifying and wave filtering circuit through electric capacity C2,
The outfan of the feedback termination optocoupler OC of chip U1, the outfan of the input termination sampling feedback circuit of optocoupler OC, chip U1's
First earth terminal ground connection, the overcurrent protection end of chip U1 is divided into three tunnels, and the first via connects the output of current rectifying and wave filtering circuit through resistance R1
Rectifying 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 the source of metal-oxide-semiconductor Q2 through resistance R3
Pole, the outfan of chip U1 connects the grid of metal-oxide-semiconductor Q2 through resistance R4, and second ground connection of chip U1 terminates the defeated of current rectifying and wave filtering circuit
Going out and hold negative pole, the power input of chip U1 is divided into two-way, and a road connects the negative pole of output end of current rectifying and wave filtering circuit through electric capacity C3, separately
One tunnel connects the emitter stage of audion Q1.
Further, sampling feedback circuit includes current/voltage feedback chip U2 and peripheral circuit, feedback chip U2's
Power input connects the outfan of constant-current circuit, the input of the output termination optocoupler OC of feedback chip U2, resistance R9, resistance
After R10, resistance R11 concatenation, entirety is in parallel with load LED, and the voltage sample of feedback chip U2 is terminated at resistance R9 and resistance R10
Junction point, the current sample of feedback chip U2 is terminated at the junction point of resistance R10 and resistance R11, and resistance R10 and resistance
The junction point of R11 is through resistance R12 ground connection.
Further, EMI protection circuit is three grades of protection circuits.Described EMI protection circuit includes the common mode being connected in series
Inductance L21, common mode inductance L22, common mode inductance L23, the input termination alternating current of common mode inductance L21, the output of common mode inductance L23
Termination rectification circuit, electric capacity C21 and the sequential circuit of electric capacity C22, resistance R21, electric capacity C23 are attempted by alternating current and common mode successively
Between the input of inductance L21, the sequential circuit of electric capacity C24, resistance R22, electric capacity C25 and electric capacity C26 is attempted by common mode successively
Between outfan and the input of common mode inductance L22 of inductance L21, electric capacity C27, electric capacity C28 and the sequential circuit of electric capacity C29,
Resistance R23 is attempted by between the outfan of common mode inductance L22 and the input of common mode inductance L23 successively, and electric capacity C30 is attempted by altogether
Between outfan and the input of rectification circuit of mould inductance L23, the junction point ground connection of electric capacity C21 and electric capacity C22, electric capacity C25
With junction point ground connection after common mode inductance L24 of electric capacity C26, the junction point ground connection of electric capacity C28 and electric capacity C29.
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, the present invention is by design regulation circuit and sampling feedback in constant-current circuit
Circuit, can regulate electric current and the voltage of circuit output, in real time to reach the effect of constant-current driving；EMI protection circuit uses three
Level safeguard procedures, can filter noise jamming to greatest extent, and circuit integrity can be stable in addition, works long hours and remains to keep good
Good electrical property, can extend the service life of LED drive circuit.
Accompanying drawing explanation
Fig. 1 illustrates that the circuit of the present invention constitutes block diagram.
Fig. 2 illustrates the circuit diagram of the present invention.
Fig. 3 illustrates the EMI circuit diagram of the present invention.
Detailed description of the invention
Technical scheme is further illustrated below in conjunction with Figure of description and specific embodiment.Should be appreciated that this
Specific embodiment described by place only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1, EMI protection circuit that this LED drive circuit includes being sequentially connected with, current rectifying and wave filtering circuit, constant-current circuit,
The input termination alternating current power supply of EMI protection circuit, the output terminating load LED of constant-current circuit.
With reference to Fig. 2, specifically depicting the composition diagram of LED drive circuit, wherein constant-current circuit includes regulating circuit and sampling
Feedback circuit, described regulation circuit is for the regulation of voltage and current, and described sampling feedback circuit is for by 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 adopts
Be DK806, it is possible to use it may occur to persons skilled in the art that other have above-mentioned functions pin DC-DC control
Chip.The output head anode of one termination current rectifying and wave filtering circuit of the armature winding of transformator, another termination metal-oxide-semiconductor of armature winding
The drain electrode of Q2, the drain electrode of metal-oxide-semiconductor Q2 is followed by the output head anode of current rectifying and wave filtering circuit through diode D3, resistance R5, and electric capacity C5 is also
Be connected on the two ends of resistance R5, one end of the secondary windings of transformator after diode D4 as the output terminating load of constant-current circuit
The anode of LED, diode D5 is attempted by the two ends of diode D4, the other end ground connection of the secondary windings of transformator, transformator
The negative pole of output end of one termination current rectifying and wave filtering circuit of auxiliary winding, the anode of another terminating diode D1, the moon of diode D1
Pole connects the colelctor electrode of audion Q1, and the negative electrode of diode D1 connects the negative pole of output end of current rectifying and wave filtering circuit, audion through electric capacity C7
The base stage of Q1 connects the negative pole of output end of current rectifying and wave filtering circuit through Zener diode D2, and the base stage of audion Q1 connects three poles through resistance R2
The colelctor electrode of pipe Q1, the Enable Pin 1 of chip U1 connects the output head anode of current rectifying and wave filtering circuit, and the compensation end 2 of chip U1 is through electric capacity
C2 connects the negative pole of output end of current rectifying and wave filtering circuit, and the feedback end 3 of chip U1 connects the outfan of optocoupler OC, the input termination of optocoupler OC
The outfan of sampling feedback circuit, first earth terminal 4 ground connection of chip U1, the overcurrent protection end 5 of chip U1 is divided into three tunnels, and first
Road connects the output head anode of current rectifying and wave filtering circuit through resistance R1, and the outfan that the second tunnel connects current rectifying and wave filtering circuit through electric capacity C4 is born
Pole, the 3rd tunnel connects the source electrode of metal-oxide-semiconductor Q2 through resistance R3, and the outfan 6 of chip U1 connects the grid of metal-oxide-semiconductor Q2, chip through resistance R4
Second earth terminal 7 of U1 connects the negative pole of output end of current rectifying and wave filtering circuit, and the power input 8 of chip U1 is divided into two-way, a road warp
Electric capacity C3 connects the negative pole of output end of current rectifying and wave filtering circuit, and another road connects the emitter stage of audion Q1.
Sampling feedback circuit includes current/voltage feedback chip U2 and peripheral circuit, and current/voltage feedback chip U2 is same
Time have voltage detecting and current detecting current/voltage feedback chip, feedback chip U2 power input 1 connect constant-current circuit
Outfan, the outfan 2 of feedback chip U2 connects the input of optocoupler OC, overall after resistance R9, resistance R10, resistance R11 concatenation
In parallel with load LED, the voltage sample end 3 of feedback chip U2 is connected to the junction point of resistance R9 and resistance R10, feedback chip U2's
Current sample end 4 is connected to the junction point of resistance R10 and resistance R11, and the junction point of resistance R10 and resistance R11 connects through resistance R12
Ground.
The electric current of sampling feedback circuit real-time sampling regulation circuit output and voltage, and compare with reference value, simultaneously
According to result of the comparison, produce feedback output, and be transferred to regulate the feedback of DC-DC control chip U1 in circuit by optocoupler OC
End 3, DC-DC control chip U1 can control the output of metal-oxide-semiconductor according to the result of feedback, thus regulation circuit is defeated
Go out, to reach the effect of constant-current driving.In addition overcurrent protection end 5 real-time sampling of DC-DC control chip U1 flows through at the beginning of transformator
The electric current of level winding, in the situation that circuital current is bigger, can control DC-DC control chip U1 and quit work or reduce MOS
The turn-on cycle of pipe Q2, to reach the effect of protection circuit.
EMI protection circuit is three grades of protection circuits, and as Fig. 3 illustrates, described EMI protection circuit includes the common mode being connected in series
Inductance L21, common mode inductance L22, common mode inductance L23, the input termination alternating current of common mode inductance L21, the output of common mode inductance L23
Termination rectification circuit, electric capacity C21 and the sequential circuit of electric capacity C22, resistance R21, electric capacity C23 are attempted by alternating current and common mode successively
Between the input of inductance L21, the sequential circuit of electric capacity C24, resistance R22, electric capacity C25 and electric capacity C26 is attempted by common mode successively
Between outfan and the input of common mode inductance L22 of inductance L21, electric capacity C27, electric capacity C28 and the sequential circuit of electric capacity C29,
Resistance R23 is attempted by between the outfan of common mode inductance L22 and the input of common mode inductance L23 successively, and electric capacity C30 is attempted by altogether
Between outfan and the input of rectification circuit of mould inductance L23, the junction point ground connection of electric capacity C21 and electric capacity C22, electric capacity C25
With junction point ground connection after common mode inductance L24 of electric capacity C26, the junction point ground connection of electric capacity C28 and electric capacity C29.Prevented by three grades
Protect measure, noise jamming can be filtered to greatest extent, improve circuit stability.
Described above is only illustrative, and it is to be understood that the amendment of layout described herein and details 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 presented by the way of above description and explanation limits.
Claims (6)
1. a LED drive circuit, it is characterised in that: EMI protection circuit that described LED drive circuit includes being sequentially connected with, whole
Stream filter circuit, constant-current circuit, the input termination alternating current power supply of EMI protection circuit, the output terminating load LED of constant-current circuit,
Described constant-current circuit includes regulating circuit and sampling feedback circuit, and described regulation circuit is for the regulation of voltage and current, described
Sampling feedback circuit is for giving regulation circuit by output voltage and current feedback.
LED drive circuit the most according to claim 1, it is characterised in that: regulation circuit include DC-DC control chip U1 and
Peripheral circuit, the output head anode of a termination current rectifying and wave filtering circuit of the armature winding of transformator, another termination of armature winding
The drain electrode of metal-oxide-semiconductor Q2, the drain electrode of metal-oxide-semiconductor Q2 is followed by the output head anode of current rectifying and wave filtering circuit, electric capacity through diode D3, resistance R5
C5 is attempted by the two ends of resistance R5, one end of the secondary windings of transformator after diode D4 as constant-current circuit output terminate
The anode of load LED, diode D5 is attempted by the two ends of diode D4, the other end ground connection of the secondary windings of transformator, transformation
The negative pole of output end of one termination current rectifying and wave filtering circuit of the auxiliary winding of device, the anode of another terminating diode D1, diode D1
Negative electrode connect the colelctor electrode of audion Q1, the negative electrode of diode D1 connects the negative pole of output end of current rectifying and wave filtering circuit through electric capacity C7, three
The base stage of pole pipe Q1 connects the negative pole of output end of current rectifying and wave filtering circuit through Zener diode D2, and the base stage of audion Q1 connects through resistance R2
The colelctor electrode of audion Q1, the output head anode enabling termination current rectifying and wave filtering circuit of chip U1, the compensation end of chip U1 is through electricity
Hold C2 and connect the negative pole of output end of current rectifying and wave filtering circuit, the outfan of the feedback termination optocoupler OC of chip U1, the input of optocoupler OC
Connect the outfan of sampling feedback circuit, the first earth terminal ground connection of chip U1, the overcurrent protection end of chip U1 is divided into three tunnels, and first
Road connects the output head anode of current rectifying and wave filtering circuit through resistance R1, and the outfan that the second tunnel connects current rectifying and wave filtering circuit through electric capacity C4 is born
Pole, the 3rd tunnel connects the source electrode of metal-oxide-semiconductor Q2 through resistance R3, and the outfan of chip U1 meets the grid of metal-oxide-semiconductor Q2, chip U1 through resistance R4
Second ground connection termination current rectifying and wave filtering circuit negative pole of output end, the power input of chip U1 is divided into two-way, and a road is through electric capacity
C3 connects the negative pole of output end of current rectifying and wave filtering circuit, and another road connects the emitter stage of audion Q1.
LED drive circuit the most according to claim 1, it is characterised in that: sampling feedback circuit includes that current/voltage feeds back
Chip U2 and peripheral circuit, the power input of feedback chip U2 connects the outfan of constant-current circuit, the output of feedback chip U2
The input of termination optocoupler OC, overall in parallel with load LED after resistance R9, resistance R10, resistance R11 concatenation, feedback chip U2's
Voltage sample is terminated at the junction point of resistance R9 and resistance R10, and the current sample of feedback chip U2 is terminated at resistance R10 and resistance
The junction point of R11, and the junction point of resistance R10 and resistance R11 is through resistance R12 ground connection.
LED drive circuit the most according to claim 1, it is characterised in that: EMI protection circuit is three grades of protection circuits.
LED drive circuit the most according to claim 4, it is characterised in that: described EMI protection circuit includes being connected in series
Common mode inductance L21, common mode inductance L22, common mode inductance L23, the input termination alternating current of common mode inductance L21, common mode inductance L23's
Output termination rectification circuit, electric capacity C21 and the sequential circuit of electric capacity C22, resistance R21, electric capacity C23 be attempted by successively alternating current with
Between the input of common mode inductance L21, the sequential circuit of electric capacity C24, resistance R22, electric capacity C25 and electric capacity C26 is attempted by successively
Between outfan and the input of common mode inductance L22 of common mode inductance L21, the concatenation electricity of electric capacity C27, electric capacity C28 and electric capacity C29
Road, resistance R23 are attempted by between the outfan of common mode inductance L22 and the input of common mode inductance L23 successively, and electric capacity C30 also connects
Between the outfan and the input of rectification circuit of common mode inductance L23, the junction point ground connection of electric capacity C21 and electric capacity C22, electric capacity
Junction point ground connection after common mode inductance L24 of C25 and electric capacity C26, the junction point ground connection of electric capacity C28 and electric capacity C29.
LED drive circuit the most according to claim 1, it is characterised in that: current rectifying and wave filtering circuit includes rectifier bridge and filtering
Circuit, filter circuit includes the output head anode of a termination rectifier bridge of electric capacity C1, electric capacity C1, 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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN106211468A true CN106211468A (en) | 2016-12-07 |
| CN106211468B CN106211468B (en) | 2018-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592702A (en) * | 2017-09-18 | 2018-01-16 | 佛山市国星光电股份有限公司 | A kind of power conditioning circuitry and LED drive device |
| CN108901100A (en) * | 2018-07-17 | 2018-11-27 | 浙江金来奥光电科技有限公司 | Multiple LED lamp beads are stablized with the constant-current supply drive system lighted |
| 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 |
| CN112218407A (en) * | 2020-08-27 | 2021-01-12 | 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 |
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| 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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| US20090267523A1 (en) * | 2008-04-24 | 2009-10-29 | Articulated Technologies, Llc | Driver circuit for light sheet module with direct connection to power source |
| 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 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107592702A (en) * | 2017-09-18 | 2018-01-16 | 佛山市国星光电股份有限公司 | A kind of power conditioning circuitry and LED drive device |
| 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 |
| CN108901100A (en) * | 2018-07-17 | 2018-11-27 | 浙江金来奥光电科技有限公司 | Multiple LED lamp beads are stablized with the constant-current supply drive system lighted |
| 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 |
| CN112218407A (en) * | 2020-08-27 | 2021-01-12 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106211468B (en) | 2018-02-02 |
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