CN103369769B - LED fly-back constant-current drive circuit - Google Patents
LED fly-back constant-current drive circuit Download PDFInfo
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- CN103369769B CN103369769B CN201210093452.XA CN201210093452A CN103369769B CN 103369769 B CN103369769 B CN 103369769B CN 201210093452 A CN201210093452 A CN 201210093452A CN 103369769 B CN103369769 B CN 103369769B
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Abstract
nullA kind of LED fly-back constant-current drive circuit，Including current rectifying and wave filtering circuit、Flyback transformer、Current sampling feedback circuit、Phototube Coupling voltage detecting circuit、PWM ripple generating unit、Switching tube，The output of described current rectifying and wave filtering circuit connects one end of the primary side winding of described flyback transformer，The other end of the primary side winding of described flyback transformer connects the first end of described switching tube，Second end of described switching tube passes through resistance eutral grounding，The end that controls of described switching tube connects the output of described PWM ripple generating unit，Described PWM ripple generating unit has the PWM ripple of certain dutycycle according to the output of current sampling feedback circuit，The input of described Phototube Coupling voltage detecting circuit is connected to the rectified filtered output of vice-side winding of described flyback transformer，Detect the voltage of the rectified filtered output of vice-side winding of described flyback transformer，When the voltage detected exceedes predetermined value，Described PWM ripple generating unit reduces the dutycycle of output PWM.
Description
Technical field
The present invention relates to LED technology field, particularly relate to a kind of LED fly-back constant-current drive circuit.
Background technology
LED is as new type light source, and it has energy-saving and environmental protection, efficient feature, and technology is ripe and answers
For every field, LED is widely used as lighting source.At present at the low-power LED occurred on the market
It is mostly based on the constant-current control circuit of BUCK structure, although this circuit simple in construction, low cost, but reliably
Property low, and be Non-isolation model, once drive that plate work is abnormal will burn out LED.
Summary of the invention
Based on this, it is necessary to provide the LED fly-back constant-current drive circuit that a kind of reliability is high.
A kind of LED fly-back constant-current drive circuit, including current rectifying and wave filtering circuit, flyback transformer, electric current
Sampling feedback circuit, Phototube Coupling voltage detecting circuit, PWM ripple generating unit, switching tube, described rectification
The output of filter circuit connects one end of the primary side winding of described flyback transformer, described inverse-excitation type transformation
The other end of the primary side winding of device connects the first end of described switching tube, and the second end of described switching tube is by electricity
Resistance ground connection, the end that controls of described switching tube connects the output of described PWM ripple generating unit, described PWM
Ripple generating unit has the PWM ripple of certain dutycycle according to the voltage output that current sampling feedback circuit feeds back,
The input of described Phototube Coupling voltage detecting circuit is connected to the vice-side winding of described flyback transformer through whole
Flow filtered output, detect the rectified filtered output of vice-side winding of described flyback transformer
Voltage, when the voltage detected exceedes predetermined value, described PWM ripple generating unit reduce output PWM
Dutycycle.
Wherein in an embodiment, described current sampling feedback circuit include the first operational amplifier, second
Operational amplifier, sampling resistor and the first voltage-reference, described sampling resistor is serially connected in LED load institute
Loop in, the in-phase input end of the high one end of described sampling resistor current potential and described first operational amplifier
Connecting, the other end of described sampling resistor is connected with the inverting input of described first operational amplifier, described
The output of the first operational amplifier is connected with the inverting input of described second operational amplifier, and described second
The in-phase input end of operational amplifier is connected with the output of described first voltage-reference, described second computing
The output of amplifier is connected with the feedback input end of described PWM ripple generating unit.
Wherein in an embodiment, described current sampling feedback circuit also include first frequency compensate circuit and
Second frequency compensates circuit, and described first frequency compensates the anti-phase input being electrically connected to the first operational amplifier
Between end and output, described second frequency compensates the inverting input being electrically connected to the second operational amplifier
And between output.
Wherein in an embodiment, described first frequency compensates circuit and includes the first electric capacity and the first resistance,
Described first electric capacity and the first resistor coupled in parallel are connected to the inverting input of described first operational amplifier after connecting
With between output, described second frequency compensates circuit and includes the second electric capacity, the 3rd electric capacity and the second resistance,
Described second electric capacity and the second resistant series connect, and described 3rd electric capacity is connected in parallel on described second electric capacity and second
It is connected to after on resistance between inverting input and the output of described second operational amplifier.
Wherein in an embodiment, described PWM ripple generation unit is UCC2803 chip.
Wherein in an embodiment, described Phototube Coupling voltage detecting circuit include photoelectrical coupler, second
Voltage-reference, described second voltage-reference is connected with the input cathode of described photoelectrical coupler, photoelectricity
The input anode of coupler connects the rectified filtered output of vice-side winding of flyback transformer, institute
The rectified filtered output of vice-side winding stating flyback transformer connects the positive pole of LED load.
Wherein in an embodiment, also include soft starting circuit, soft starting circuit include the 3rd resistance, two
Pole pipe, the 4th electric capacity, PNP triode, the VREF pin of described chip UCC2803 connects described two poles
The negative electrode of pipe, the negative electrode of described diode D1 connects one end of described 3rd resistance, described 3rd resistance another
One end connects the anode of described diode, the anode of described diode connect described 4th electric capacity one end and
The base stage of PNP triode, the other end of described 4th electric capacity connects the colelctor electrode of described PNP triode and is followed by
Power supply ground, the emitter stage of described PNP triode Q2 connects the COMP pin of described chip UCC2803.
Above-mentioned LED fly-back constant-current drive circuit, when described LED fly-back constant-current drive circuit zero load,
When the most not accessing LED load or LED load open circuit, described current sampling feedback circuit feeds back to PWM
The value of ripple generating unit is zero, promotes PWM ripple generating unit constantly to increase the dutycycle of output PWM, from
And make the voltage on the rectified filtered output of vice-side winding of flyback transformer constantly increase, instead
Swash and be connected to Phototube Coupling voltage detecting circuit on the rectified filtered output of vice-side winding of formula transformer
After, the voltage on the rectified filtered output of vice-side winding of detection flyback transformer, if detecting
Voltage exceed predetermined value, then make PWM ripple generating unit reduce output PWM dutycycle, make output electricity
Pressure is maintained at predetermined value, improves the reliability of LED fly-back constant-current drive circuit.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram of the LED fly-back constant-current drive circuit of a kind of embodiment；
Fig. 2 is the circuit diagram of the LED fly-back constant-current drive circuit of a kind of embodiment；
Fig. 3 is the circuit diagram of the LED fly-back constant-current drive circuit of another kind of embodiment.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage more clearly, below in conjunction with accompanying drawing and enforcement
Example, the present invention is described in more detail.Should be appreciated that specific embodiment described herein is only in order to solve
Release the present invention, be not intended to limit the present invention.
The switching tube 600 in switching tube Q1 i.e. Fig. 1 in Fig. 2, Fig. 3.
As it is shown in figure 1, the LED fly-back constant-current drive circuit that present embodiment provides, including rectifying and wave-filtering
Circuit 100, flyback transformer 200, current sampling feedback circuit 300, Phototube Coupling voltage detecting circuit
400, PWM ripple generating unit 500 and switching tube 600.The output of current rectifying and wave filtering circuit 100 connects anti-
Swashing one end of the primary side winding of formula transformer 200, the other end of the primary side winding of flyback transformer 200 is even
Connecing the first end of switching tube 600, the second end of switching tube 600 passes through resistance eutral grounding, the control of switching tube 600
End processed connects the output for exporting PWM waveform of PWM ripple generating unit 500, and PWM ripple occurs
Unit 500 has the PWM of certain dutycycle according to the voltage output that current sampling feedback circuit 300 feeds back
Ripple, the input of Phototube Coupling voltage detecting circuit 400 is connected to the vice-side winding of flyback transformer 200
Rectified filtered output, after the rectified filtering of vice-side winding detecting flyback transformer 200
The voltage of output, when the voltage detected exceedes predetermined value, PWM ripple generating unit 500 reduces defeated
Go out the dutycycle of PWM, to reduce the voltage of flyback transformer 200 vice-side winding output.
Referring to Fig. 2, current rectifying and wave filtering circuit 100 includes full-bridge rectification bridge heap BR1 and filter capacitor C1, entirely
The input of bridge rectistack BR1 connects alternating current, and the output head anode of full-bridge rectification heap BR1 connects filtered electrical
Holding the positive pole of C1, the negative pole of output end of full-bridge rectification bridge heap BR1 connects the negative pole of filter capacitor C1.
The output head anode of full-bridge rectification heap BR1 is also connected with one end of the primary side winding of flyback transformer 200,
First end of the other end connecting valve pipe Q1 of the primary side winding of flyback transformer 200, switching tube Q1's
Second end pass through resistance eutral grounding, switching tube Q1 control end connect PWM ripple generating unit 500 for defeated
Go out the output of PWM waveform.
Current sampling feedback circuit 300 includes the first operational amplifier U1, the second operational amplifier U2, adopts
Sample resistance R1 and the first voltage-reference, sampling resistor R1 is serially connected in the loop at LED load place,
One end that sampling resistor R1 current potential is high is connected with the in-phase input end of the first operational amplifier U1, sampling resistor
The other end and the first operational amplifier U1 inverting input connect, the output of the first operational amplifier U1
End is connected with the inverting input of the second operational amplifier U2, the in-phase input end of the second operational amplifier U2
Being connected with the output of the first voltage-reference, the output of the second operational amplifier U2 occurs with PWM ripple
The feedback input end of unit 200 connects.
The inverting input of the second operational amplifier U2 and the output of the first voltage-reference connect, the second fortune
The output calculating amplifier U2 is connected with the feedback input end of PWM ripple generating unit 500.
In a preferred embodiment, current sampling feedback circuit 300 also includes that first frequency compensates circuit 301 He
Second frequency compensates circuit 302, and first frequency compensates circuit 301 and is connected to the same of the first operational amplifier U1
Between phase input and output, second frequency compensates circuit 302 and is connected to the same of the second operational amplifier U2
Between phase input and output.
In the present embodiment, first frequency compensates circuit 301 and includes the first electric capacity C2 and the first resistance R2, the
One electric capacity C2 and the first resistance R2 is connected to the inverting input of the first operational amplifier U1 after being connected in parallel
And between output.
Second frequency compensates circuit 302 and includes the second electric capacity C3, the 3rd electric capacity C4 and the second resistance R3,
Second electric capacity C3 and the second resistance R3 is connected in series, and the 3rd electric capacity C4 is connected in parallel on the second electric capacity C3 and second
It is connected to after on resistance R3 between inverting input and the output of the second operational amplifier U2.
Phototube Coupling voltage detecting circuit 400 includes photoelectrical coupler U3, the second voltage-reference, the second electricity
Pressure a reference source is connected with the input negative pole of photoelectrical coupler U3, and the input anode of photoelectrical coupler U3 connects
The rectified filtered output of vice-side winding of flyback transformer 200.
In the present embodiment, PWM ripple generating unit 500 is UCC2803 chip, and photoelectrical coupler U3's is defeated
Going out proper pole and connect COMP pin, the negative pole of output end of photoelectrical coupler U3 connects FB pin.Photoelectricity every
Ionization voltage testing circuit 400 detects the rectified filtered output of vice-side winding of flyback transformer 200
Voltage, when the voltage detected is more than the voltage of the second voltage-reference, the luminescence of photoelectrical coupler U3
Device is luminous, makes the phototriode of photoelectrical coupler U3 turn on, the COMP pin input of UCC2803 chip
Less than the voltage of VREF, after this voltage compares with the predeterminated voltage within UCC2803, control PWM ripple
Generating unit 500 reduces the dutycycle of output PWM.
LED fly-back constant-current drive circuit band carries after starting, and current sampling feedback circuit 300 is to LED load
Current sampling, and amplify and export to the feedback input end of PWM generating unit 500.If the electricity sampled
Stream increases, then PWM generating unit 200 reduces the dutycycle of output PWM；If the electric current sampled subtracts
Little, then PWM generating unit 200 increases the dutycycle of output PWM, makes the current constant of LED load.
If when LED load open circuit or zero load, Phototube Coupling voltage detecting circuit 400 detects flyback transformer 200
The voltage of the rectified filtered output of vice-side winding, when the voltage detected is more than the second voltage reference
During source, control PWM ripple generating unit 500 and reduce the dutycycle of output PWM.When LED load is normal
During work, Phototube Coupling voltage detecting circuit 400 does not works.
In the present embodiment, LED fly-back constant-current drive circuit also includes soft starting circuit, soft starting circuit bag
Include the 3rd resistance R4, diode D1, the 4th electric capacity C5, PNP triode Q2, chip UCC2803's
VREF pin connects the negative electrode of diode D1, and the negative electrode of diode D1 connects one end of the 3rd resistance R4,
The other end of the 3rd resistance R4 connects the anode of diode D1, and the anode of diode D1 connects the 4th electric capacity
One end of C5 and the base stage of PNP triode Q2, the other end of the 4th electric capacity C5 connects PNP triode
The colelctor electrode of Q2 is followed by power supply ground, and the emitter stage of PNP triode Q2 connects the COMP of chip UCC2803
Pin.
PWM ripple generating unit 500 has certain dutycycle according to current sampling feedback circuit 300 output
PWM ripple.
In a preferred embodiment, refer to Fig. 3, current rectifying and wave filtering circuit 100 also include transformer L1, second
Two outputs of filter capacitor C6 and the 3rd filter capacitor C7, transformer L1 connect full-bridge rectification respectively
Two inputs of bridge heap BR1, are also connected with the second filter between two inputs of full-bridge rectification bridge heap BR1
The input of ripple electric capacity C6, transformer L1 connects alternating current, between two inputs of transformer L1 also
Connect the 3rd filter capacitor C7.Can get what we wanted by transformer L1 and full-bridge rectification bridge heap BR1
DC voltage.
Above-mentioned LED fly-back constant-current drive circuit, when described LED fly-back constant-current drive circuit zero load,
When the most not accessing LED load or LED load open circuit, current sampling feedback circuit feeds back to PWM ripple and sends out
The value of raw unit is zero, promotes PWM ripple generating unit constantly to increase the dutycycle of output PWM, so that
Voltage on the rectified filtered output of vice-side winding of flyback transformer constantly increases, at inverse-excitation type
After being connected to Phototube Coupling voltage detecting circuit on the rectified filtered output of vice-side winding of transformer,
Voltage on the rectified filtered output of vice-side winding of detection flyback transformer, if the electricity detected
Pressure exceedes predetermined value, then make PWM ripple generating unit reduce the dutycycle of output PWM, make output voltage protect
Hold in predetermined value, improve the reliability of LED fly-back constant-current drive circuit.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for this area
Those of ordinary skill for, without departing from the inventive concept of the premise, it is also possible to make some deformation and
Improving, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended
Claim is as the criterion.
Claims (6)
1. a LED fly-back constant-current drive circuit, it is characterised in that include current rectifying and wave filtering circuit, anti-
Swash formula transformer, current sampling feedback circuit, Phototube Coupling voltage detecting circuit, PWM ripple generating unit,
Switching tube, the output of described current rectifying and wave filtering circuit connects one end of the primary side winding of described flyback transformer,
The other end of the primary side winding of described flyback transformer connects the first end of described switching tube, described switching tube
The second end by resistance eutral grounding, the end that controls of described switching tube connects the output of described PWM ripple generating unit
End, the voltage output that described PWM ripple generating unit feeds back according to current sampling feedback circuit has certain duty
The PWM ripple of ratio, the input of described Phototube Coupling voltage detecting circuit is connected to described flyback transformer
The rectified filtered output of vice-side winding, the output of described Phototube Coupling voltage detecting circuit is with described
PWM ripple generating unit connects；Described Phototube Coupling voltage detecting circuit is used for detecting described flyback transformer
The voltage of the rectified filtered output of vice-side winding, when the voltage detected exceedes predetermined value, institute
State PWM ripple generating unit and reduce the dutycycle of output PWM；Described current sampling feedback circuit includes first
Operational amplifier, the second operational amplifier, sampling resistor and the first voltage-reference, described sampling resistor
Being serially connected in the loop at LED load place, one end that described sampling resistor current potential is high is put with described first computing
The in-phase input end of big device connects, and the other end of described sampling resistor is anti-phase with described first operational amplifier
Input connects, the output of described first operational amplifier and the anti-phase input of described second operational amplifier
End connects, and the in-phase input end of described second operational amplifier connects with the output of described first voltage-reference
Connecing, the output of described second operational amplifier is connected with the feedback input end of described PWM ripple generating unit.
LED fly-back constant-current drive circuit the most according to claim 1, it is characterised in that described electricity
Stream sampling feedback circuit also includes that first frequency compensates circuit and second frequency compensates circuit, described first frequency
Compensation is electrically connected between inverting input and the output of the first operational amplifier, and described second frequency is mended
Repay and be electrically connected between inverting input and the output of the second operational amplifier.
LED fly-back constant-current drive circuit the most according to claim 2, it is characterised in that described
One frequency compensated circuit includes that the first electric capacity and the first resistance, described first electric capacity and the first resistor coupled in parallel connect
After be connected between inverting input and the output of described first operational amplifier, described second frequency compensates
Circuit includes that the second electric capacity, the 3rd electric capacity and the second resistance, described second electric capacity and the second resistant series are even
Connecing, described 3rd electric capacity is connected to described second computing after being connected in parallel on described second electric capacity and the second resistance and puts
Between inverting input and the output of big device.
4. according to the LED fly-back constant-current drive circuit described in claim 1, it is characterised in that described PWM
Ripple generating unit is UCC2803 chip.
LED fly-back constant-current drive circuit the most according to claim 4, it is characterised in that described light
Electric isolution voltage detecting circuit includes photoelectrical coupler, the second voltage-reference, described second voltage-reference
Being connected with the input cathode of described photoelectrical coupler, the input anode of photoelectrical coupler connects inverse-excitation type and becomes
The rectified filtered output of vice-side winding of depressor, the vice-side winding of described flyback transformer is rectified
Filtered output connects the positive pole of LED load.
LED fly-back constant-current drive circuit the most according to claim 4, it is characterised in that also include
Soft starting circuit, soft starting circuit includes the 3rd resistance, diode, the 4th electric capacity, PNP triode, institute
The VREF pin stating UCC2803 chip connects the negative electrode of described diode, and the negative electrode of described diode connects
One end of described 3rd resistance, the anode of the other end described diode of connection of described 3rd resistance, described two
The anode of pole pipe connects one end and the base stage of PNP triode of described 4th electric capacity, described 4th electric capacity another
One end connects the colelctor electrode of described PNP triode and is followed by power supply ground, and the emitter stage of described PNP triode connects
The COMP pin of described UCC2803 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210093452.XA CN103369769B (en) | 2012-03-31 | 2012-03-31 | LED fly-back constant-current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210093452.XA CN103369769B (en) | 2012-03-31 | 2012-03-31 | LED fly-back constant-current drive circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN103369769A CN103369769A (en) | 2013-10-23 |
| CN103369769B true CN103369769B (en) | 2016-09-07 |
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| CN201210093452.XA Expired - Fee Related CN103369769B (en) | 2012-03-31 | 2012-03-31 | LED fly-back constant-current drive circuit |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659755A (en) * | 2013-11-21 | 2015-05-27 | 海洋王（东莞）照明科技有限公司 | LED constant current driving protection circuit and lamp |
| CN104039039B (en) * | 2014-05-23 | 2017-01-04 | 中国科学院广州能源研究所 | A kind of constant current LED drive circuit exporting two-way |
| CN106466507B (en) * | 2016-10-13 | 2023-09-08 | 上海健康医学院 | Isolated program-controlled electric stimulator |
| CN107318197A (en) * | 2017-08-17 | 2017-11-03 | 无锡市益明光电有限公司 | A kind of LED multi-path current balance circuit |
| CN112968425B (en) * | 2021-04-30 | 2023-02-21 | 重庆斯微奇电子技术有限公司 | Secondary short-circuit protection circuit of switching power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201204722Y (en) * | 2007-12-28 | 2009-03-04 | 王元成 | Automatic light-adjusting LED illumination driver |
| CN101677214A (en) * | 2008-09-17 | 2010-03-24 | 比亚迪股份有限公司 | Switching mode power source |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100201302B1 (en) * | 1996-04-19 | 1999-06-15 | 이장헌 | Strange lamp automatic detection apparatus |
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2012
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201204722Y (en) * | 2007-12-28 | 2009-03-04 | 王元成 | Automatic light-adjusting LED illumination driver |
| CN101677214A (en) * | 2008-09-17 | 2010-03-24 | 比亚迪股份有限公司 | Switching mode power source |
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