CN104039039A - Two-way output constant current LED (Light-Emitting Diode) driving circuit - Google Patents
Two-way output constant current LED (Light-Emitting Diode) driving circuit Download PDFInfo
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- CN104039039A CN104039039A CN201410222393.0A CN201410222393A CN104039039A CN 104039039 A CN104039039 A CN 104039039A CN 201410222393 A CN201410222393 A CN 201410222393A CN 104039039 A CN104039039 A CN 104039039A
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Abstract
The invention discloses a two-way output constant current LED (Light-Emitting Diode) driving circuit which comprises a rectifying and filtering module, a master control output module and a constant current control module, wherein the rectifying and filtering module performs filtering and rectification treatment on alternating current output by a power supply, and then outputs the alternating current to the master control output module; the master control output module sequentially performs voltage transformation, rectification and filtering treatment on voltage output by the rectifying and filtering module, and then supplies power to an LED lamp; and the constant current control module samples output current of the master control output module, amplifies the sampling current, and adjusts output voltage of the master control output module according to the amplified sampling current. Therefore, the output current of the master control output module is constant, the output power is improved, harmonic pollution to a power grid is reduced greatly, and long-term stable operation of a driver is ensured.
Description
Technical field
The present invention relates to LED drive circuit, particularly a kind of constant current LED drive circuit of exporting two-way.
Background technology
LED lighting technology has the advantages such as energy-saving and environmental protection, life-span are long and easy to control, is 21 century one of high-tech sector most with prospects, and it becomes the leading of illumination market by replacing incandescent lamp and fluorescent lamp.Under LED Lighting Industry bright prospect like this, for the different application of lighting field, various LED lamp drive circuits are also in development rapidly, and it adopts switch power technology mostly.LED Switching Power Supply is with efficiently, environmental protection, and the advantage such as good backlight is just being used to each field, become the main flow of technical development, yet LED field also exists a lot of problems now, as: power factor is lower, power-efficient is not high, high in cost of production.
Thereby prior art need to improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of constant current LED drive circuit of exporting two-way, can make the constant output current of LED drive circuit.
In order to achieve the above object, the present invention has taked following technical scheme:
A constant current LED drive circuit of exporting two-way, comprising:
Rectification filtering module, for carrying out the alternating current of power supply output filtering and rectification processing;
Master control output module, powers to LED lamp for the voltage of rectification filtering module output is carried out after transformation, rectification and filtering are processed successively;
Constant-current control module, for the output current of master control output module is sampled, and amplifies sample rate current, adjusts the output voltage of master control output module according to the sampled voltage amplifying, and makes the constant output current of master control output module;
The input of described rectification filtering module connects power supply, the output of rectification filtering module connects the first input end of master control output module, the output of constant-current control module connects the second input of master control output module, described master control output module has positive output end, the first negative output terminal and the second negative output terminal, described the first negative output terminal connects the first input end of constant-current control module, and the second negative output terminal connects the second input of constant-current control module.
In the constant current LED drive circuit of described output two-way, described rectification filtering module comprises:
EMI filter unit, for carrying out filtering processing to the alternating current of power supply output;
Bridge rectifier unit, for carrying out rectification processing to the signal of EMI filter unit output;
The input of described EMI filter unit connects power supply, and the output of EMI filter unit connects master control output module by described bridge rectifier unit.
In the constant current LED drive circuit of described output two-way, described EMI filter unit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity, the first resistance, the second resistance and CML inductor;
One end of described the first electric capacity connects the live wire of power supply and the 2nd end of CML inductor, also by the first resistance, is connected successively the 1st end of CML inductor with the second resistance, and the other end of the first electric capacity connects the 1st end of CML inductor and the zero line of power supply; The 3rd end of described CML inductor connects ground wire and the bridge rectifier unit of power supply by the second electric capacity, the 4th end of CML inductor connects ground wire and the bridge rectifier unit of power supply by the 3rd electric capacity.
In the constant current LED drive circuit of described output two-way, described bridge rectifier unit comprises bridge rectifier and the 4th electric capacity, the first ac input end of described bridge rectifier connects the 4th end of CML inductor, the second ac input end of bridge rectifier connects the 3rd end of CML inductor, the direct current minus earth of bridge rectifier, the direct-flow positive pole of bridge rectifier connects master control output module, also by the 4th capacity earth.
In the constant current LED drive circuit of described output two-way, described master control output module comprises: transformer, rectifier diode, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity and the 8th electric capacity;
The Same Name of Ends of the armature winding of described transformer connects the direct-flow positive pole of the different name end connection bridge rectifier of constant-current control module, armature winding, the Same Name of Ends of the secondary winding of transformer connects A1 end and the A2 end of rectifier diode, the different name end ground connection of secondary winding; The K end of described rectifier diode respectively by the 5th electric capacity, the 6th electric capacity and the 7th capacity earth, be also connected master control output module positive output end, also by the 8th electric capacity, connect the first negative output terminal of master control output module and first input end and second negative input end of the second negative output terminal and constant-current control module.
In the constant current LED drive circuit of described output two-way, described constant-current control module comprises:
Double-current adopts unit, for respectively two of master control output module output branch roads being carried out to current sample;
Amplifying unit, for amplifying the sampled signal of double-current employing unit;
Voltage feedback unit, for feeding back to adjustment unit by the output voltage of amplifying unit;
Adjustment unit, for adjust the power output of transformer according to the feedback voltage value of voltage feedback unit, makes the constant output current of master control output module;
Described master control output module, double-current adopt unit, amplifying unit, voltage feedback unit, adjustment unit to be in turn connected to form loop.
In the constant current LED drive circuit of described output two-way, described double-current adopts unit to comprise the first power resistor and the second power resistor, one end of described the first power resistor connects the first negative output terminal of master control output module and the first input end of amplifying unit, also by the 8th electric capacity, is connected master control output module positive output end, the other end ground connection of the first power resistor; One end of described the second power resistor connects the second negative output terminal of master control output module and the second input of amplifying unit, also by the 8th electric capacity, is connected master control output module positive output end, the other end ground connection of the second power resistor.
In the constant current LED drive circuit of described output two-way, described amplifying unit comprises described the first operational amplifier, the second operational amplifier, the first diode, the second diode and current-limiting resistance;
The in-phase input end of described the first operational amplifier connects one end of described the first power resistor, and the inverting input of the first operational amplifier connects reference voltage end, and the output of the first operational amplifier connects the positive pole of the second diode;
The in-phase input end of described the second operational amplifier connects one end of described the second power resistor, and the inverting input of the second operational amplifier connects reference voltage end, and the output of the second operational amplifier connects the positive pole of the first diode;
The negative pole of the negative pole of described the first diode and the second diode is connected voltage feedback unit by described current-limiting resistance.
In the constant current LED drive circuit of described output two-way, described voltage feedback unit comprises TL431 voltage stabilizing didoe and opto-coupler chip, the R end of described TL431 voltage stabilizing didoe connects the negative pole of the first diode and the negative pole of the second diode by described current-limiting resistance, the A end ground connection of TL431 voltage stabilizing didoe, the K end of TL431 voltage stabilizing didoe connects the 2nd pin of opto-coupler chip, the 1st pin of opto-coupler chip connects the 3rd pin connection adjustment unit of the first feeder ear, opto-coupler chip, the 4th pin of opto-coupler chip connects the second feeder ear.
In the constant current LED drive circuit of described output two-way, described adjustment unit comprises, Current Control chip, the 9th electric capacity, the tenth electric capacity, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity, the 14 electric capacity, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and metal-oxide-semiconductor; The model of described Current Control chip is UC3844;
The 1st pin of described Current Control chip connects the 2nd pin of Current Control chip by the 9th electric capacity, also by the 3rd resistance, connect the 2nd pin of Current Control chip, the 2nd pin of described Current Control chip connects the 3rd pin of opto-coupler chip, the 3rd pin of described Current Control chip is respectively by described the 12 electric capacity and the 4th grounding through resistance, the 4th pin of described Current Control chip connects the 8th pin of Current Control chip by described the 6th resistance, also by the 14 capacity earth, the 8th pin of described Current Control chip is by the 13 capacity earth, the 5th pin ground connection of Current Control chip, the 7th pin of Current Control chip U4 connects the direct-flow positive pole of bridge rectifier, also respectively by the tenth electric capacity, the 11 capacity earth, the 6th pin of Current Control chip connects the grid of metal-oxide-semiconductor by the 5th resistance, the Same Name of Ends of the armature winding of the drain electrode connection transformer of described metal-oxide-semiconductor, the source ground of metal-oxide-semiconductor.
Compared to prior art, the constant current LED drive circuit of output two-way provided by the invention, comprise rectification filtering module, master control output module and constant-current control module, the alternating current of power supply being exported by rectification filtering module carries out filtering and master control output module is exported in rectification processing, by master control output module, the voltage of rectification filtering module output is carried out to transformation successively, rectification and filtering are powered to LED lamp after processing, by constant-current control module, the output current of master control output module is sampled simultaneously, and sample rate current is amplified, according to the sample rate current amplifying, adjust the output voltage of master control output module, make the constant output current of master control output module, thereby raising power output, greatly alleviate the harmonic pollution to electrical network, also guarantee the operation of driver long-term stability simultaneously.
Accompanying drawing explanation
Fig. 1 is the structured flowchart that the present invention exports the constant current LED drive circuit of two-way.
Fig. 2 is the circuit diagram that the present invention exports the constant current LED drive circuit of two-way.
Embodiment
The invention provides a kind of constant current LED drive circuit of exporting two-way, for making object of the present invention, technical scheme and effect clearer, clear and definite, referring to accompanying drawing, developing simultaneously, the present invention is described in more detail for embodiment.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, it exports the structured flowchart of the constant current LED drive circuit of two-way for the present invention.As shown in Figure 1, the constant current LED drive circuit of output two-way of the present invention comprises: rectification filtering module 10, master control output module 20 and constant-current control module 30.
Wherein, the input of described rectification filtering module 10 connects power supply, for the alternating current of power supply output being carried out to filtering and rectification processing.The output of rectification filtering module 10 connects the first input end of master control output module 20, the output of constant-current control module 30 connects the second input of master control output module 20, for the voltage of rectification filtering module 10 outputs being carried out successively to transformation, rectification and filtering, processes rear to the power supply of LED lamp.
Described master control output module 20 has positive output end OUT+, the first negative output terminal OUT1-and the second negative output terminal OUT2-, accessible several LED lamps between positive output end OUT+ and each negative output terminal.Described the first negative output terminal OUT1-connects the first input end of constant-current control module 30, and the second negative output terminal OUT2-connects the second input of constant-current control module 30.Two output branch roads of described master control output module 20 share a positive output end OUT+, constant-current control module 30 respectively connects the negative output terminal of a branch road, for the output current of master control output module 20 is sampled, and sample rate current is amplified, according to the sampled voltage amplifying, adjust the output voltage of master control output module 20, make the constant output current of master control output module 20, thereby power output is improved, greatly alleviate the harmonic pollution to electrical network, also guarantee the operation of driver long-term stability simultaneously.
See also Fig. 2, described rectification filtering module 10 comprises: EMI (Electromagnetic Interference, electromagnetic interference) filter unit 101 and bridge rectifier unit 102, the input of described EMI filter unit 101 connects power supply, and the output of EMI filter unit 101 connects master control output module 20 by described bridge rectifier unit 102.EMI filter unit 101 is for carrying out filtering processing to the alternating current of power supply output, and the EMI that reduces power supply disturbs.Described bridge rectifier unit 102 is for carrying out rectification processing to the signal of EMI filter unit 101 outputs.
In the embodiment of the present invention, described EMI filter unit 101 comprises the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the first resistance R 1, the second resistance R 2 and CML inductor L1, filtering is to the noise signal in the alternating current of power supply input, and the EMI that reduces power supply disturbs.
One end of described the first capacitor C 1 connects the live wire L of power supply and the 2nd end of CML inductor L1, also by the first resistance R 1, is connected successively the 1st end of CML inductor L1 with the second resistance R 2, and the other end of the first capacitor C 1 connects the 1st end of CML inductor L1 and the zero line N of power supply; The 3rd end of described CML inductor L1 connects ground wire FG and the bridge rectifier unit 102 of power supply by the second capacitor C 2, the 4th end of CML inductor L1 (being the output of rectification filtering module) connects ground wire and the bridge rectifier unit 102 of power supply by the 3rd capacitor C 3.
Described bridge rectifier unit 102 comprises bridge rectifier BD1 and the 4th capacitor C 4, the first ac input end of described bridge rectifier BD1 connects the 4th end of CML inductor L1, the second ac input end of bridge rectifier BD1 connects the 3rd end of CML inductor L1, the direct current minus earth of bridge rectifier BD1, the direct-flow positive pole of bridge rectifier BD1 connects master control output module 20 and constant-current control module 30, also by the 4th capacitor C 4 ground connection.
Please continue to refer to Fig. 1 and Fig. 2, described master control output module 20 comprises: transformer T1, rectifier diode D11, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7 and the 8th capacitor C 8, wherein, the model of described rectifier diode D11 is STTH2003C.Described the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7 formation filter circuits are load (as LED lamp) power supply after the noise signal of filtering transformer T1 output.
The Same Name of Ends of the armature winding of described transformer T1, be the second input of master control output module, connect constant-current control module 30, armature winding different name end, be the first input end of master control output module, the direct-flow positive pole that connects bridge rectifier BD1, the Same Name of Ends of the secondary winding of transformer T1 connects A1 end and the A2 end of rectifier diode D11, the different name end ground connection of secondary winding; The K end of described rectifier diode D11 respectively by the 5th capacitor C 5, the 6th capacitor C 6 and the 7th capacitor C 7 ground connection, be also connected master control output module 20 positive output ends, also by the 8th capacitor C 8, connect the first negative output terminal OUT1-, the second negative output terminal OUT2-of master control output modules 20 and first input end and second negative input end of constant-current control module 30.Owing to being two-way output, also can be understood as master control output module 20 herein has two positive output end OUT1+ and OUT2+.
Please again consult Fig. 1 and Fig. 2, described constant-current control module 30 comprises: double-current adopts unit 301, amplifying unit 302, voltage feedback unit 303 and adjustment unit 304, and described master control output module 20, double-current adopt unit 301, amplifying unit 302, voltage feedback unit 303, adjustment unit 304 to be in turn connected to form loop.
Described double-current adopts unit 301 for respectively two of master control output module 20 output branch roads being carried out to current sample; Amplifying unit 302 adopts the sampled signal of unit 301 for amplifying double-current; Voltage feedback unit 303 is for feeding back to adjustment unit 304 by the output voltage of amplifying unit 302; Adjustment unit 304, for adjust the power output of transformer T1 according to the feedback voltage value of voltage feedback unit 303, makes the constant output current of master control output module 20.
During concrete enforcement, described double-current adopts unit 301 to comprise the first power resistor Ra1 and the second power resistor Ra2, one end of described the first power resistor Ra1, be the first input end of constant-current control module 30, the the first negative output terminal OUT1-that connects master control output module 20 with the first input end of amplifying unit 302, also by the 8th capacitor C 8, be connected master control output module 20 positive output ends, the other end ground connection of the first power resistor Ra1; One end of described the second power resistor Ra2, be the second input of constant-current control module 30, connect the second negative output terminal OUT2-of master control output module 20 and the second input of amplifying unit, also by the 8th capacitor C 8, be connected master control output module 20 positive output ends, the other end ground connection of the second power resistor Ra2.
Described amplifying unit 302 comprises described the first operational amplifier U1, the second operational amplifier U2, the first diode D1, the second diode D2 and current-limiting resistance Ra3.Wherein, described the first operational amplifier U1 and the second operational amplifier U2 are analog computing amplifier, can be integrated in an amplifier chip, as the model amplifier chip that is LF353.
The in-phase input end of described the first operational amplifier U1, be the first input end of amplifying unit 302, the one end that connects described the first power resistor Ra1, the inverting input of the first operational amplifier U1 connects the first feeder ear Vf+, and the output of the first operational amplifier U1 connects the positive pole of the second diode D2.
The in-phase input end of described the second operational amplifier U2, be the second input of amplifying unit 302, the one end that connects described the second power resistor Ra2, the inverting input of the second operational amplifier U2 connects the first feeder ear Vf+, and the output of the second operational amplifier U2 connects the positive pole of the first diode D1.The negative pole of the negative pole of described the first diode D1 and the second diode D2 is connected voltage feedback unit 303 by described current-limiting resistance Ra3.
Described voltage feedback unit 303 comprises TL431 voltage stabilizing didoe Q11 and opto-coupler chip U3, and the model of described opto-coupler chip U3 is TL521, mainly plays buffer action, and anti-stop signal disturbs.
The R end of described TL431 voltage stabilizing didoe Q11 connects the negative pole of the first diode D1 and the negative pole of the second diode D2 by described current-limiting resistance Ra3, the A end ground connection of TL431 voltage stabilizing didoe Q11, the K end of TL431 voltage stabilizing didoe Q11 connects the 2nd pin of opto-coupler chip U3, the 1st pin of opto-coupler chip U3 connects the 3rd pin connection adjustment unit 304 of the first feeder ear Vf+, opto-coupler chip U3, the 4th pin of opto-coupler chip U3 connects the second feeder ear Vref+5V.
Described adjustment unit 304 comprises Current Control chip U4, the 9th capacitor C 9, the tenth capacitor C the 10, the 11 capacitor C the 11, the 12 capacitor C the 12, the 13 capacitor C the 13, the 14 capacitor C 14, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6 and metal-oxide-semiconductor Q1; The model of described Current Control chip U4 is UC3844, is mainly used in adjusting its output voltage according to the size of voltage feedback unit 303 feedback voltages, and the power output of terminal control transformer T1, makes current constant.
The 1st pin of described Current Control chip U4 connects the 2nd pin of Current Control chip U4 by the 9th capacitor C 9, also by the 3rd resistance R 3, connect the 2nd pin of Current Control chip U4, the 2nd pin of described Current Control chip U4 connects the 3rd pin of opto-coupler chip U3, the 3rd pin of described Current Control chip U4 is respectively by described the 12 capacitor C 12 and the 4th resistance R 4 ground connection, the 4th pin of described Current Control chip U4 connects the 8th pin of Current Control chip U4 by described the 6th resistance R 6, also by the 14 capacitor C 14 ground connection, the 8th pin of described Current Control chip U4 is by the 13 capacitor C 13 ground connection, the 5th pin ground connection of Current Control chip U4, the 7th pin of Current Control chip U4 connects the direct-flow positive pole of bridge rectifier BD1, also respectively by the tenth capacitor C 10, the 11 capacitor C 11 ground connection, the 6th pin of Current Control chip U4 connects the grid of metal-oxide-semiconductor Q1 by the 5th resistance R 5, the Same Name of Ends of the armature winding of the drain electrode of described metal-oxide-semiconductor Q1 (being the output of constant-current control module) connection transformer T1, the source ground of metal-oxide-semiconductor Q1.
Below in conjunction with Fig. 1 and Fig. 2, the operation principle of the constant current LED drive circuit of output two-way of the present invention is elaborated:
AC-input voltage is sent into bridge rectifier unit 102 and is carried out rectification processing after EMI filter unit 101 carries out EMI filtering processing, through transformer T1, carry out energy primary and secondary coupled transfer afterwards, through rectifier diode D11, carry out rectification processing afterwards, through the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, form filter circuit again and carry out after filtering processing, output LED load required voltage and electric current.
In order to maintain stable output, need to detect output branch road, the current signal that is about to the first power resistor Ra1 and the second power resistor Ra2 sends into respectively the in-phase input end of the first operational amplifier U1 and the in-phase input end of the second operational amplifier U2 amplifies, the output signal of described the first operational amplifier U1 and the second operational amplifier U2 is delivered in the voltage feedback unit 303 being comprised of TL431 voltage stabilizing didoe Q11 and opto-coupler chip U3 after second diode D2 the first diode D1 and current-limiting resistance Ra3, through adjustment unit 304, adjust again the size of voltage, the object of controlling to reach constant current.
Owing to there being two branch roads in constant current LED drive circuit of the present invention, and shared positive output end OUT+, each negative output terminal power resistor of all connecting (is Ra1, Ra2) receive " power supply ground ", by power resistor Ra1, the size of current of two output branch roads of Ra2 sampling, and then sampled signal is delivered to respectively to the first operational amplifier U1 and the second operational amplifier U2, through analog computing amplifier, compare amplifier, output constant current control signal, this constant current control signal is directly controlled the R end size of current of TL431 voltage stabilizing didoe Q11, the voltage feedback unit 303 forming by TL431 voltage stabilizing didoe Q11 and opto-coupler chip U3, the 2 pin feedback voltages of Current Control chip U4 are changed, after being processed by Current Control chip U4, adjust the output voltage size of its 6th pin, make the output voltage of metal-oxide-semiconductor Q1 conducting transmission current control chip U4, the power output of control transformer T1, thereby make two branch currents keep constant.
Because two branch road institute bringing onto loads are identical, and the present invention realizes branch road constant current by adjusting the size of total voltage, as long as so guarantee that wherein the branch current of maximum current is constant, other each branch road output currents are also constant, and one road branch road zero load can not affect the normal work of other branch roads, improve power output, greatly alleviated the harmonic pollution to electrical network, also guaranteed the operation of driver long-term stability simultaneously.And the present invention adopted the electronic component of a small amount of routine to realize the stable output of each branch road constant current, its cost is low, is applicable to promoting the use of.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. a constant current LED drive circuit of exporting two-way, is characterized in that, comprising:
Rectification filtering module, for carrying out the alternating current of power supply output filtering and rectification processing;
Master control output module, powers to LED lamp for the voltage of rectification filtering module output is carried out after transformation, rectification and filtering are processed successively;
Constant-current control module, for the output current of master control output module is sampled, and amplifies sample rate current, adjusts the output voltage of master control output module according to the sampled voltage amplifying, and makes the constant output current of master control output module;
The input of described rectification filtering module connects power supply, the output of rectification filtering module connects the first input end of master control output module, the output of constant-current control module connects the second input of master control output module, described master control output module has positive output end, the first negative output terminal and the second negative output terminal, described the first negative output terminal connects the first input end of constant-current control module, and the second negative output terminal connects the second input of constant-current control module.
2. the constant current LED drive circuit of output two-way according to claim 1, is characterized in that, described rectification filtering module comprises:
EMI filter unit, for carrying out filtering processing to the alternating current of power supply output;
Bridge rectifier unit, for carrying out rectification processing to the signal of EMI filter unit output;
The input of described EMI filter unit connects power supply, and the output of EMI filter unit connects master control output module by described bridge rectifier unit.
3. the constant current LED drive circuit of output two-way according to claim 2, is characterized in that, described EMI filter unit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity, the first resistance, the second resistance and CML inductor;
One end of described the first electric capacity connects the live wire of power supply and the 2nd end of CML inductor, also by the first resistance, is connected successively the 1st end of CML inductor with the second resistance, and the other end of the first electric capacity connects the 1st end of CML inductor and the zero line of power supply; The 3rd end of described CML inductor connects ground wire and the bridge rectifier unit of power supply by the second electric capacity, the 4th end of CML inductor connects ground wire and the bridge rectifier unit of power supply by the 3rd electric capacity.
4. the constant current LED drive circuit of output two-way according to claim 3, it is characterized in that, described bridge rectifier unit comprises bridge rectifier and the 4th electric capacity, the first ac input end of described bridge rectifier connects the 4th end of CML inductor, the second ac input end of bridge rectifier connects the 3rd end of CML inductor, the direct current minus earth of bridge rectifier, the direct-flow positive pole of bridge rectifier connects master control output module, also by the 4th capacity earth.
5. the constant current LED drive circuit of output two-way according to claim 4, is characterized in that, described master control output module comprises: transformer, rectifier diode, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity and the 8th electric capacity;
The Same Name of Ends of the armature winding of described transformer connects the direct-flow positive pole of the different name end connection bridge rectifier of constant-current control module, armature winding, the Same Name of Ends of the secondary winding of transformer connects A1 end and the A2 end of rectifier diode, the different name end ground connection of secondary winding; The K end of described rectifier diode respectively by the 5th electric capacity, the 6th electric capacity and the 7th capacity earth, be also connected master control output module positive output end, also by the 8th electric capacity, connect the first negative output terminal of master control output module and first input end and second negative input end of the second negative output terminal and constant-current control module.
6. the constant current LED drive circuit of output two-way according to claim 5, is characterized in that, described constant-current control module comprises:
Double-current adopts unit, for respectively two of master control output module output branch roads being carried out to current sample;
Amplifying unit, for amplifying the sampled signal of double-current employing unit;
Voltage feedback unit, for feeding back to adjustment unit by the output voltage of amplifying unit;
Adjustment unit, for adjust the power output of transformer according to the feedback voltage value of voltage feedback unit, makes the constant output current of master control output module;
Described master control output module, double-current adopt unit, amplifying unit, voltage feedback unit, adjustment unit to be in turn connected to form loop.
7. the constant current LED drive circuit of output two-way according to claim 6, it is characterized in that, described double-current adopts unit to comprise the first power resistor and the second power resistor, one end of described the first power resistor connects the first negative output terminal of master control output module and the first input end of amplifying unit, also by the 8th electric capacity, is connected master control output module positive output end, the other end ground connection of the first power resistor; One end of described the second power resistor connects the second negative output terminal of master control output module and the second input of amplifying unit, also by the 8th electric capacity, is connected master control output module positive output end, the other end ground connection of the second power resistor.
8. the constant current LED drive circuit of output two-way according to claim 7, is characterized in that, described amplifying unit comprises described the first operational amplifier, the second operational amplifier, the first diode, the second diode and current-limiting resistance;
The in-phase input end of described the first operational amplifier connects one end of described the first power resistor, and the inverting input of the first operational amplifier connects reference voltage end, and the output of the first operational amplifier connects the positive pole of the second diode;
The in-phase input end of described the second operational amplifier connects one end of described the second power resistor, and the inverting input of the second operational amplifier connects reference voltage end, and the output of the second operational amplifier connects the positive pole of the first diode;
The negative pole of the negative pole of described the first diode and the second diode is connected voltage feedback unit by described current-limiting resistance.
9. the constant current LED drive circuit of output two-way according to claim 8, it is characterized in that, described voltage feedback unit comprises TL431 voltage stabilizing didoe and opto-coupler chip, the R end of described TL431 voltage stabilizing didoe connects the negative pole of the first diode and the negative pole of the second diode by described current-limiting resistance, the A end ground connection of TL431 voltage stabilizing didoe, the K end of TL431 voltage stabilizing didoe connects the 2nd pin of opto-coupler chip, the 1st pin of opto-coupler chip connects the 3rd pin connection adjustment unit of the first feeder ear, opto-coupler chip, the 4th pin of opto-coupler chip connects the second feeder ear.
10. the constant current LED drive circuit of output two-way according to claim 9, it is characterized in that, described adjustment unit comprises, Current Control chip, the 9th electric capacity, the tenth electric capacity, the 11 electric capacity, the 12 electric capacity, the 13 electric capacity, the 14 electric capacity, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and metal-oxide-semiconductor; The model of described Current Control chip is UC3844;
The 1st pin of described Current Control chip connects the 2nd pin of Current Control chip by the 9th electric capacity, also by the 3rd resistance, connect the 2nd pin of Current Control chip, the 2nd pin of described Current Control chip connects the 3rd pin of opto-coupler chip, the 3rd pin of described Current Control chip is respectively by described the 12 electric capacity and the 4th grounding through resistance, the 4th pin of described Current Control chip connects the 8th pin of Current Control chip by described the 6th resistance, also by the 14 capacity earth, the 8th pin of described Current Control chip is by the 13 capacity earth, the 5th pin ground connection of Current Control chip, the 7th pin of Current Control chip U4 connects the direct-flow positive pole of bridge rectifier, also respectively by the tenth electric capacity, the 11 capacity earth, the 6th pin of Current Control chip connects the grid of metal-oxide-semiconductor by the 5th resistance, the Same Name of Ends of the armature winding of the drain electrode connection transformer of described metal-oxide-semiconductor, the source ground of metal-oxide-semiconductor.
Priority Applications (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104540296A (en) * | 2015-01-08 | 2015-04-22 | 福建思科通电子科技有限公司 | Compatible LED intelligent fluorescent lamp tube and control method thereof |
| CN105916258A (en) * | 2016-06-16 | 2016-08-31 | 广东科谷电源股份有限公司 | Constant current power source capable of converting double LED path driving mode to single LED path driving mode |
| CN108646839A (en) * | 2018-07-06 | 2018-10-12 | 广东奥普特科技股份有限公司 | A kind of constant-current circuit fast-response control device |
| CN110996426A (en) * | 2019-12-19 | 2020-04-10 | 江苏科谷电子有限公司 | Multi-path output LED drive circuit with current protection |
| CN112333889A (en) * | 2020-11-25 | 2021-02-05 | 深圳创维－Rgb电子有限公司 | Double-direct-drive LED power circuit and television |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4039850A (en) * | 1976-05-17 | 1977-08-02 | Fairchild Camera And Instrument Corporation | Voltage converter |
| CN201286184Y (en) * | 2008-10-16 | 2009-08-05 | 杭州奥能电源设备有限公司 | Multipath outputting constant current LED driver circuit |
| CN101621871A (en) * | 2009-08-07 | 2010-01-06 | 烟台奥星电器设备有限公司 | New type high-power LED driving power source |
| CN103220856A (en) * | 2013-04-10 | 2013-07-24 | 浙江大学城市学院 | Self-adapting light emitting diode (LED) driving power circuit |
| CN103369769A (en) * | 2012-03-31 | 2013-10-23 | 海洋王照明科技股份有限公司 | LED fly-back constant current driving circuit |
-
2014
- 2014-05-23 CN CN201410222393.0A patent/CN104039039B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4039850A (en) * | 1976-05-17 | 1977-08-02 | Fairchild Camera And Instrument Corporation | Voltage converter |
| CN201286184Y (en) * | 2008-10-16 | 2009-08-05 | 杭州奥能电源设备有限公司 | Multipath outputting constant current LED driver circuit |
| CN101621871A (en) * | 2009-08-07 | 2010-01-06 | 烟台奥星电器设备有限公司 | New type high-power LED driving power source |
| CN103369769A (en) * | 2012-03-31 | 2013-10-23 | 海洋王照明科技股份有限公司 | LED fly-back constant current driving circuit |
| CN103220856A (en) * | 2013-04-10 | 2013-07-24 | 浙江大学城市学院 | Self-adapting light emitting diode (LED) driving power circuit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104540296A (en) * | 2015-01-08 | 2015-04-22 | 福建思科通电子科技有限公司 | Compatible LED intelligent fluorescent lamp tube and control method thereof |
| CN105916258A (en) * | 2016-06-16 | 2016-08-31 | 广东科谷电源股份有限公司 | Constant current power source capable of converting double LED path driving mode to single LED path driving mode |
| CN105916258B (en) * | 2016-06-16 | 2018-02-16 | 广东科谷电源股份有限公司 | Two-way LED drivings are converted to the constant-current supply of single LED driving |
| CN108646839A (en) * | 2018-07-06 | 2018-10-12 | 广东奥普特科技股份有限公司 | A kind of constant-current circuit fast-response control device |
| CN110996426A (en) * | 2019-12-19 | 2020-04-10 | 江苏科谷电子有限公司 | Multi-path output LED drive circuit with current protection |
| CN112333889A (en) * | 2020-11-25 | 2021-02-05 | 深圳创维－Rgb电子有限公司 | Double-direct-drive LED power circuit and television |
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| CN104039039B (en) | 2017-01-04 |
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