CN206024166U - A kind of LED drive circuit - Google Patents
A kind of LED drive circuit Download PDFInfo
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- CN206024166U CN206024166U CN201620911229.5U CN201620911229U CN206024166U CN 206024166 U CN206024166 U CN 206024166U CN 201620911229 U CN201620911229 U CN 201620911229U CN 206024166 U CN206024166 U CN 206024166U
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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 utility model discloses a kind of LED drive circuit, EMI protection circuit that LED drive circuit includes being sequentially connected, 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, the constant-current circuit includes adjusting circuit and sampling feedback circuit, the circuit that adjusts is used for the regulation of voltage and current, and the sampling feedback circuit is used 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 for remaining to keep good, can extend the service life of LED drive circuit.
Description
Technical field
This utility model belongs to LED field, more particularly to a kind of LED drive circuit.
Background technology
LED illumination be in recent years rapid rising development a kind of new type light source, its many good feature cause it should
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 the just damage less than a year having.This is as 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 not high, and driveability is bad.Mesh
Front in field of LED drive, generally adopt constant-current drive circuit to make 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 more stable occasion of line voltage can only be suitable for.
Utility model content
Utility model purpose：For solving the problems, such as prior art, the luminous stability of LED, this utility model is improved
A kind of LED drive circuit is provided.
Technical scheme：A kind of LED drive circuit, EMI protection circuit that the LED drive circuit includes being sequentially connected, 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,
The constant-current circuit includes adjusting circuit and sampling feedback circuit, and the regulation circuit is used for the regulation of voltage and current, described
Sampling feedback circuit is used for giving regulation circuit by output voltage and current feedback.
Further, adjusting circuit includes DC-DC control chips U1 and peripheral circuit, one end of the armature winding of transformator
Connect 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 after diode D4 as constant-current circuit output terminating load LED anode, 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 assists winding of transformator
The negative pole of output end on road, the anode of another terminating diode D1, the negative electrode of diode D1 connect 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 connect the colelctor electrode of audion Q1, the Enable Pin of chip U1 through resistance R2
The output head anode of current rectifying and wave filtering circuit is connect, the compensation end 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 is grounded, and 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
Proper pole, the second tunnel connect 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 connect 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
Go out and hold negative pole, the power input of chip U1 is divided into two-way, connects the negative pole of output end of current rectifying and wave filtering circuit all the way through electric capacity C3, separately
The emitter stage of audion Q1 is connect all the way.
Further, sampling feedback circuit includes current/voltage feedback chip U2 and peripheral circuit, feeds back chip U2's
Power input terminates the outfan of constant-current circuit, feeds back the input of the output termination optocoupler OC of chip U2, resistance R9, resistance
Overall in parallel with load LED after R10, resistance R11 concatenation, the voltage sample for feeding back chip U2 is terminated at resistance R9 and resistance R10
Junction point, the current sample for feeding back 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 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, the input termination alternating current of common mode inductance L21, the output of common mode inductance L23
Termination rectification circuit, the sequential circuit of electric capacity C21 and 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 the input of the outfan of inductance L21 and common mode inductance L22, electric capacity C27, the sequential circuit of electric capacity C28 and electric capacity C29,
Resistance R23 is attempted by between the input of the outfan of common mode inductance L22 and common mode inductance L23 successively, and electric capacity C30 is attempted by altogether
Between the outfan and the input of rectification circuit of mould inductance L23, the junction point of electric capacity C21 and electric capacity C22 is grounded, electric capacity C25
It is grounded after common mode inductance L24 with the junction point of electric capacity C26, the junction point of electric capacity C28 and electric capacity C29 is grounded.
Further, current rectifying and wave filtering circuit includes that rectifier bridge and filter circuit, filter circuit include electric capacity C1, electric capacity C1's
The output head anode of one termination rectifier bridge, the other end are grounded.
Beneficial effect：Compare prior art, and this utility model passes through design in constant-current circuit and adjusts circuit and sampling
Feedback circuit, can be with the electric current of real-time regulation circuit output and voltage, to reach the effect of constant-current driving；EMI protection circuit is adopted
Three-level safeguard procedures are used, noise jamming can be filtered to greatest extent, circuit integrity can be stablized in addition, work long hours and remain to protect
Good electrical property is held, the service life of LED drive circuit can be extended.
Description of the drawings
Fig. 1 illustrates that circuit of the present utility model constitutes block diagram.
Fig. 2 illustrates circuit diagram of the present utility model.
Fig. 3 illustrates EMI circuit diagrams of the present utility model.
Specific embodiment
The technical solution of the utility model is further illustrated below in conjunction with Figure of description and specific embodiment.Should manage
Solution, specific embodiment described herein only in order to explain this utility model, are not used to limit this utility model.
With reference to Fig. 1, EMI protection circuit that the LED drive circuit includes being sequentially connected, 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, the composition figure of LED drive circuit is specifically depicted, wherein constant-current circuit includes adjusting 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.
Adjusting circuit includes DC-to-dc (DC-DC) control chip U1 and peripheral circuit, and the chip U1 in the present embodiment is adopted
DK806, it is also possible to using 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 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 the two ends of resistance R5, the output terminating load of one end of the secondary windings of transformator after diode D4 as constant-current circuit
The anode of LED, diode D5 are attempted by the two ends of diode D4, and the other end of the secondary windings of transformator is grounded, transformator
The negative pole of output end of one termination current rectifying and wave filtering circuit of assists 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 connect 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 of chip U1 are grounded, 5 Fen Wei of overcurrent protection end, tri- tunnels of chip U1, and first
Road connects the output head anode of current rectifying and wave filtering circuit through resistance R1, and the second tunnel is born through the outfan that electric capacity C4 connects current rectifying and wave filtering circuit
Pole, the 3rd tunnel connect 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 8 points of the power input of chip U1 is 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 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
When there is the current/voltage feedback chip of voltage detecting and current detecting, the power input 1 for feeding back chip U2 to connect constant-current circuit
Outfan, the outfan 2 for feeding back chip U2 connects the input of optocoupler OC, overall after resistance R9, resistance R10, resistance R11 concatenations
In parallel with load LED, the voltage sample end 3 for feeding back chip U2 is connected to the junction point of resistance R9 and resistance R10, feeds back 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 is connect through resistance R12
Ground.
Sampling feedback circuit real-time sampling adjusts the electric current and voltage of circuit output, and is compared with reference value, while
According to result of the comparison, feedback output is produced, and the feedback for being transferred to adjust DC-DC control chip U1 in circuit 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 circuit
Go out, to reach the effect of constant-current driving.In addition 5 real-time sampling of overcurrent protection end of DC-DC control chips U1 is flowed through at the beginning of transformator
The electric current of level winding, in the situation that circuital current is larger, 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-level protection circuit, and such as Fig. 3 illustrates that the 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, the sequential circuit of electric capacity C21 and 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 the input of the outfan of inductance L21 and common mode inductance L22, electric capacity C27, the sequential circuit of electric capacity C28 and electric capacity C29,
Resistance R23 is attempted by between the input of the outfan of common mode inductance L22 and common mode inductance L23 successively, and electric capacity C30 is attempted by altogether
Between the outfan and the input of rectification circuit of mould inductance L23, the junction point of electric capacity C21 and electric capacity C22 is grounded, electric capacity C25
It is grounded after common mode inductance L24 with the junction point of electric capacity C26, the junction point of electric capacity C28 and electric capacity C29 is grounded.Anti- by three-level
Shield measure, can filter noise jamming to greatest extent, improve circuit stability.
Described above be only illustrative, and it is to be understood that 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 presented is limiting by above description and by way of explaining.
Claims (6)
1. a kind of LED drive circuit, it is characterised in that：EMI protection circuit that the LED drive circuit includes being sequentially connected, 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,
The constant-current circuit includes adjusting circuit and sampling feedback circuit, and the regulation circuit is used for the regulation of voltage and current, described
Sampling feedback circuit is used for giving regulation circuit by output voltage and current feedback.
2. LED drive circuit according to claim 1, it is characterised in that：Adjust circuit include DC-DC control chips 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 are 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, and one end of the secondary windings of transformator is terminated as the output of constant-current circuit after diode D4
The anode of load LED, diode D5 are 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 assists 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 is connect through resistance R2
The colelctor electrode of audion Q1, the output head anode of the enable termination current rectifying and wave filtering circuit of chip U1, the compensation end of chip U1 is through electricity
Hold the negative pole of output end that C2 connects 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 are divided into three tunnels, first
Road connects the output head anode of current rectifying and wave filtering circuit through resistance R1, and the second tunnel is born through the outfan that electric capacity C4 connects current rectifying and wave filtering circuit
Pole, the 3rd tunnel connect 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, all the way 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.
3. LED drive circuit 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 for feeding back chip U2 terminate the outfan of constant-current circuit, feed back the output of chip U2
The input of termination optocoupler OC, overall in parallel with load LED after resistance R9, resistance R10, resistance R11 concatenations, feed back chip U2's
Voltage sample is terminated at the junction point of resistance R9 and resistance R10, and the current sample for feeding back 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.
4. LED drive circuit according to claim 1, it is characterised in that：EMI protection circuit is three-level protection circuit.
5. LED drive circuit according to claim 4, it is characterised in that：The 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, the sequential circuit of electric capacity C21 and 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 the input of the outfan of common mode inductance L21 and common mode inductance L22, the concatenation electricity of electric capacity C27, electric capacity C28 and electric capacity C29
Road, resistance R23 are attempted by between the input of outfan and common mode inductance L23 of common mode inductance L22 successively, and electric capacity C30 simultaneously connects
Between the input of the outfan and rectification circuit of common mode inductance L23, the junction point of electric capacity C21 and electric capacity C22 is grounded, electric capacity
The junction point of C25 and electric capacity C26 is grounded after common mode inductance L24, and the junction point of electric capacity C28 and electric capacity C29 is grounded.
6. 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 that electric capacity C1, the output head anode of a termination rectifier bridge of electric capacity C1, the other end are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620911229.5U CN206024166U (en) | 2016-08-19 | 2016-08-19 | A kind of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620911229.5U CN206024166U (en) | 2016-08-19 | 2016-08-19 | A kind of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206024166U true CN206024166U (en) | 2017-03-15 |
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ID=58250292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620911229.5U Expired - Fee Related CN206024166U (en) | 2016-08-19 | 2016-08-19 | A kind of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206024166U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106211468A (en) * | 2016-08-19 | 2016-12-07 | 盐城工学院 | A kind of LED drive circuit |
| 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 |
-
2016
- 2016-08-19 CN CN201620911229.5U patent/CN206024166U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106211468A (en) * | 2016-08-19 | 2016-12-07 | 盐城工学院 | A kind of LED drive circuit |
| CN106211468B (en) * | 2016-08-19 | 2018-02-02 | 盐城工学院 | A kind of LED drive circuit |
| 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 |
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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: 20170315 Termination date: 20180819 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |