CN105979662A - LED constant current drive circuit and LED lighting device - Google Patents
LED constant current drive circuit and LED lighting device Download PDFInfo
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- CN105979662A CN105979662A CN201610527874.1A CN201610527874A CN105979662A CN 105979662 A CN105979662 A CN 105979662A CN 201610527874 A CN201610527874 A CN 201610527874A CN 105979662 A CN105979662 A CN 105979662A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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Abstract
The invention belongs to the field of LED driving control and provides a LED constant current drive circuit and a LED lighting apparatus. The LED constant current circuit is a LED drive circuit having high power factor and no stroboscopic effect. The LED constant current drive circuit includes a constant voltage control module, a feedback control module and a constant current drive module. The feedback control module samples an output voltage of a LED string light, compares the sample voltage with a preset benchmark voltage, and outputs a first control voltage and a constant voltage after performing processing. The constant voltage control module enables the output voltage of the LED string light to be equal to the preset benchmark voltage based on the first control voltage. The constant current drive circuit conducts constant current control on currents passing by the LED string light based on the constant voltage. The LED constant current drive circuit eliminates effects on the LED string light imposed by power frequency of the current of an output end of current regular high power LED drive circuits, and further eliminates stroboscopic phenomenon of LEDs.
Description
Technical field
The invention belongs to LED and drive control field, particularly relate to a kind of constant current driver circuit for LED and LED
Illuminator.
Background technology
At present, a kind of new type light source of LED (Light Emitting Diode, light emitting diode) conduct, due to
It has, and energy consumption is low, brightness strong and the advantage of life-span length, has been widely used in every field.LED is
Typical current mode device, it is the highest to the stability requirement of operating current, if for the electric current driving LED
In there is power frequency ripple, then LED can be caused to there will be stroboscopic phenomenon, and people's long-term work is at the light of stroboscopic
Under source, visual fatigue can be produced.
Existing LED drive circuit without stroboscopic is that the AC rectification of input electrical network is filtered into unidirectional current
Drive LED, thus realize LED without stroboscopic, but because of the input of existing LED drive circuit without stroboscopic
Being terminated with bulky capacitor, the power factor causing whole circuit is the lowest, so can cause public gauze necessarily
The harmonic pollution of degree.And in order to meet the requirement of High Power Factor, existing High Power Factor LED drives
The input of circuit does not the most connect electric capacity, but the electric current of its outfan so can be caused to there is the biggest power frequency ripple
Stricture of vagina, it is impossible to realize LED without stroboscopic.
In summary, there is bigger power frequency because of output end current in existing High Power Factor LED drive circuit
Ripple and causing cannot realize LED without stroboscopic.
Summary of the invention
It is an object of the invention to provide a kind of constant current driver circuit for LED and LED light device, it is intended to solve
Certainly existing High Power Factor LED drive circuit causes because output end current there is bigger power frequency ripple
The LED problem without stroboscopic cannot be realized.
The present invention is achieved in that a kind of constant current driver circuit for LED, connects with LED series winding, described
Constant current driver circuit for LED includes rectification module, energy storage inductor and diode, and described rectification module is to alternating current
Carry out rectification, and export unidirectional current and supplied by described energy storage inductor and described diode pair LED string
Electricity, described constant current driver circuit for LED also includes: Isobarically Control module, feedback control module and constant-current driving
Module；
First end of described Isobarically Control module and the second end of described energy storage inductor and the anode of described diode
Connecting, the sampling end of described feedback control module is connected to described with the first end of described constant-current driven module altogether
The outfan of LED string, the first outfan of described feedback control module and the second outfan are respectively with described
The input of Isobarically Control module and the input of described constant-current driven module connect, described Isobarically Control module
The second end of the second end and described constant-current driven module be connected to ground altogether；
Described Isobarically Control module controls the energy storage of described energy storage inductor and releases energy；Described feedback control module pair
The output voltage of described LED string is sampled, and sampled voltage and preset reference voltage is compared also
Exporting the first control voltage and constant voltage after process, described Isobarically Control module controls electricity according to described first
Pressure regulate the energy storage time of described energy storage inductor and release can the time so that the output voltage of described LED string with
Described preset reference voltage is equal；Meanwhile, described constant-current driven module according to described constant voltage to flowing through
The electric current stating LED string carries out current constant control.
Present invention also offers a kind of LED light device, be connected with alternating current power supply, and include LED string,
Described LED light device also includes above-mentioned constant current driver circuit for LED.
The constant current driver circuit for LED that the present invention provides is that High Power Factor is without stroboscopic LED drive circuit, bag
Including Isobarically Control module, feedback control module and constant-current driven module module, feedback control module is to LED
The output voltage of string is sampled, and exports after sampled voltage and preset reference voltage are compared and processed
First controls voltage and constant voltage, and Isobarically Control module controls voltage according to first makes the output of LED string
Voltage is equal with preset reference voltage, and constant-current driven module is according to the constant voltage electric current to flowing through LED string
Carry out current constant control, thus eliminate the electric current working frequency ripple wave pair of existing high-power LED driving circuit outfan
The impact of LED string, and then eliminate the stroboscopic phenomenon of LED.
Accompanying drawing explanation
Fig. 1 is the modular structure schematic diagram of the constant current driver circuit for LED that the embodiment of the present invention provides；
Fig. 2 is the modular structure schematic diagram of the constant current driver circuit for LED that another embodiment of the present invention provides；
Fig. 3 is the electrical block diagram of the constant current driver circuit for LED that the embodiment of the present invention provides；
Fig. 4 is that in the constant current driver circuit for LED that the embodiment of the present invention provides, the difference of SCR control switch is cut
Input voltage, input current and the waveform diagram of output electric current corresponding to phase angle.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
Only in order to explain the present invention, it is not intended to limit the present invention.
The constant current driver circuit for LED that this embodiment provides be High Power Factor without stroboscopic LED drive circuit,
Including Isobarically Control module, feedback control module and constant-current driven module module, feedback control module is to LED
The output voltage of lamp string is sampled, and defeated after sampled voltage is compared with preset reference voltage and processed
Going out the first control voltage and constant voltage, Isobarically Control module controls voltage according to first makes the defeated of LED string
Going out voltage equal with preset reference voltage, constant-current driven module is according to the constant voltage electricity to flowing through LED string
Stream carries out current constant control, thus eliminates the working frequency ripple wave of existing high-power LED driving circuit output end current
Impact on LED string, and then eliminate the stroboscopic phenomenon of LED.
Fig. 1 shows the modular structure of the constant current driver circuit for LED that the embodiment of the present invention provides, for the ease of
Illustrating, illustrate only the part relevant to the embodiment of the present invention, details are as follows:
A kind of constant current driver circuit for LED 1, is connected with LED string 2, and constant current driver circuit for LED 1 is wrapped
Including rectification module 10, energy storage inductor L1 and diode D1, rectification module 10 carries out rectification to alternating current,
And export unidirectional current and LED string 2 is powered by energy storage inductor L1 and diode D1.Wherein,
LED string 2 is connected next light emitting diode by multiple light emitting diodes according to the negative electrode of a upper light emitting diode
The form of anode be followed in series to form, in LED string 2, the anode of first light emitting diode is LED
The input of lamp string 2, in LED string 2, the negative electrode of last light emitting diode is LED string 2
Outfan.
Constant current driver circuit for LED 1 also includes: Isobarically Control module 11, feedback control module 12 and constant current
Drive module 13.
First end of Isobarically Control module 11 connects with the anode of second end of energy storage inductor L1 and diode D1
Connecing, the sampling end of feedback control module 12 is connected to LED string 2 altogether with the first end of constant-current driven module 13
Outfan, the first outfan of feedback control module 12 and the second outfan respectively with Isobarically Control module
The input of 11 and the input of constant-current driven module 13 connect, and the second end of Isobarically Control module 11 is with permanent
Stream drives the second end of module 13 to be connected to ground altogether.
Isobarically Control module 11 controls the energy storage of energy storage inductor L1 by turn-on and turn-off and releases energy；Feedback
The output voltage of LED string 2 is sampled by control module 12, and by sampled voltage and preset reference electricity
Pressure exports the first control voltage and constant voltage after comparing and processing, Isobarically Control module 11 is according to first
Control the energy storage time of voltage-regulation energy storage inductor L1 and release the energy time, so that the output electricity of LED string 2
Press equal with preset reference voltage；Meanwhile, constant-current driven module 13 according to constant voltage to flowing through LED
The electric current of string 2 carries out current constant control.
In embodiments of the present invention, the first outfan of rectification module 10 connects with first end of energy storage inductor L1
Connecing, second end of energy storage inductor L1 is connected with the anode of diode D1, the negative electrode of diode D1 and LED
The input of lamp string 2 connects, the ground connection of the second output of rectification module 10.In actual applications, rectification mould
Block 10 can be bridge rectifier.
In embodiments of the present invention, when Isobarically Control module 11 turns on, the direct current of rectification module 10 output
Electricity is charged (i.e. energy storage inductor L1 carries out energy storage), when Isobarically Control module 11 to energy storage inductor L1
During shutoff, LED string 2 is discharged (i.e. energy storage inductor L1 by energy storage inductor L1 by diode D1
Carry out releasing energy or demagnetization).When the output voltage of LED string 2 is higher, feedback control module 12 exports
First control voltage the lowest, Isobarically Control module according to first control voltage, make the storage of energy storage inductor L1
Can reduce the time, so that the electric energy that energy storage inductor L1 discharges to LED string 2 reduces, LED string 2
Output voltage reduce, vice versa.By sampling repeatedly and the Isobarically Control module of feedback control module 12
The regulation repeatedly of 11, finally makes the output voltage stabilization of LED string 2 at preset reference voltage.And constant current
Drive the constant voltage output constant current that module 13 exports according to feedback control module 12, so that LED
String 2 flows through constant current, thus eliminates the power frequency stricture of vagina of existing high-power LED driving circuit output end current
The ripple impact on LED string 2, and then eliminate the stroboscopic phenomenon of LED.
As one embodiment of the invention, constant current driver circuit for LED 1 also includes SCR control switch 14, can
Control silicon controls switch 14 and is connected to the positive output end of alternating current power supply AC and the first input end of rectification module 10
Between, the second input of rectification module 10 is connected with the negative output terminal of alternating current power supply AC.
When LED string 2 is carried out brightness regulation, the output voltage of LED string 2 and SCR control
The cut angle of switch 14 is corresponding, and feedback control mould 12 tuber exports phase according to the output voltage of LED string 2
The constant voltage answered makes constant-current driven module 13 that the electric current flowing through LED string 2 is carried out corresponding constant current control
System.
In embodiments of the present invention, can be controlled it to friendship by controlling the cut angle of SCR control switch 14
The cut of stream electricity.The cut angle of SCR control switch is the least, and it is the biggest to the cut of alternating current, alternating current
After rectified, the galvanic meansigma methods of output of each gauze cycle is the least so that the output of LED string 2
Voltage is the least, and when the output voltage of LED string 2 is less than preset voltage value, feedback control module 12 is defeated
Go out the constant voltage reduction to constant-current driven module 13, so that the electric current of constant-current driven module 13 output
Reducing, the electric current i.e. flowing through LED string 2 reduces, and LED string 2 is dimmed, thus can be to LED string
2 realize brightness regulation.
Fig. 2 shows the modular structure of the constant current driver circuit for LED 1 that another embodiment of the present invention provides, for
Being easy to explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows:
As one embodiment of the invention, Isobarically Control module 11 includes: switch element 110, control unit 111,
Cut-off signals generation unit 111 and Continuity signal generation unit 113.
Wherein, the hot end of switch element 110 connects work altogether with the first end of Continuity signal generation unit 113
For the first end of Isobarically Control module 11, the second end of Continuity signal generation unit 113 produces with cut-off signals
Second end of unit 112 connects the second end as Isobarically Control module 11, the electronegative potential of switch element 110 altogether
End be connected with the first end of cut-off signals generation unit 112, the outfan of cut-off signals generation unit 112 with
The outfan of Continuity signal generation unit 113 respectively with the first input end of control unit 111 and the second input
End connects, and the outfan of control unit 111 is connected with the control end of switch element 110, and cut-off signals produces
The input of unit 112 is the input of Isobarically Control module 11.
Continuity signal generation unit 113, at the end of detecting that energy storage inductor L1 releases energy (demagnetization), exports
Continuity signal is to control unit 111, so that control unit 111 controls switch element 110 and turns on.Turn off letter
Number generation unit 112 when peak point current energy storage inductor L1 being detected reaches pre-set peak value electric current, output
Cut-off signals is to control unit 111, so that control unit 111 controls switch element 110 and turns off.
As one embodiment of the invention, feedback control module 12 includes that the second reference voltage source 120, error are put
Big device U5 and voltage regulation unit 121.
Wherein, in-phase input end and second reference voltage source 120 of error amplifier U5 connect, and error is put
The sampling end that inverting input is feedback control module 12 of big device U5, the outfan of error amplifier U5
Connecing the input of voltage regulation unit 121, the first outfan of voltage regulation unit 121 and the second outfan are respectively anti-
First outfan of feedback control module 12 and the second outfan.
Fig. 3 shows the circuit structure of the constant current driver circuit for LED 1 that the embodiment of the present invention provides, in order to just
In explanation, illustrate only the part relevant to the embodiment of the present invention, details are as follows:
As one embodiment of the invention, switch element 112 is NMOS tube Q2, the leakage of NMOS tube Q2
The extremely hot end of switch element 112, the source electrode of NMOS tube Q2 is the electronegative potential of switch element 112
End, the grid of NMOS tube Q2 is the control end of switch element 112.
As one embodiment of the invention, Continuity signal generation unit 113 includes the 3rd resistance R3, the second electric capacity
C2, the first comparator U1 and the first reference voltage source 1130.
Wherein, first end that the first end is Continuity signal generation unit 113 of the 3rd resistance R3, the second electricity
Hold second end that negative pole is Continuity signal generation unit 113 of C2, second end and second of the 3rd resistance R3
The positive pole of electric capacity C2 is connected to the in-phase input end of the first comparator U1 altogether, and the first comparator U1's is anti-phase defeated
Entering end to be connected with the first reference voltage source 1130, the outfan of the first comparator U1 is that Continuity signal produces list
The outfan of unit 113.
As one embodiment of the invention, cut-off signals generation unit 112 includes the second comparator U2 and second
Resistance R2.
The input that in-phase input end is cut-off signals generation unit 112 of the second comparator U2, the second ratio
The inverting input of relatively device U2 and first end of the second resistance R2 connect altogether as cut-off signals generation unit 112
The first end, second end that the second end is cut-off signals generation unit 112 of the second resistance R2, second ratio
The relatively outfan of device U2 is the outfan of cut-off signals generation unit 112.
As one embodiment of the invention, control unit 111 includes rest-set flip-flop U7 and phase inverter U8.
The set end S of rest-set flip-flop U7 and reset terminal R be respectively control unit 111 first input end and
Second input, the input of the in-phase output end Q and phase inverter U8 of rest-set flip-flop U7 is connected, anti-phase
The outfan of device U8 is the outfan of control unit 111.
As one embodiment of the invention, voltage regulation unit 121 includes: the 3rd switching tube Q3, the 4th resistance R4,
5th resistance R5, the 6th resistance R6, the first operational amplifier U3, the second operational amplifier U4, the 3rd
Reference voltage source the 1210, the 4th switching tube Q4, the 7th resistance R7 and the 8th resistance R8.
3rd switching tube Q3 controls the input that end is voltage regulation unit 121, the high electricity of the 3rd switching tube Q3
First end of electronegative potential termination the 4th resistance R4 of position termination power VCC, the 3rd switching tube Q3, the 4th
The homophase that second end of resistance R4 and first end of the 5th resistance R5 are connected to the first operational amplifier U3 altogether is defeated
Entering end, second end of the 5th resistance R5 and first end of the 6th resistance R6 connect altogether as voltage regulation unit 121
First outfan, the second end ground connection of the 6th resistance R6, the high potential termination power of the 4th switching tube Q4
The outfan controlling termination the first operational amplifier U3 of VCC, the 4th switching tube Q4, the first operation amplifier
The inverting input of device U3 and first end of the 7th resistance R7 are connected to the cold end of the 4th switching tube Q4 altogether,
Second end of the 7th resistance R7 and first end of the 8th resistance R8 are connected to the anti-of the second operational amplifier U4 altogether
Phase input, termination the 3rd reference voltage source 1210 of input in the same direction of the second operational amplifier U4, the second fortune
It is defeated that second end of the outfan and the 8th resistance R8 of calculating amplifier U4 connects as voltage regulation unit 121 second altogether
Go out end.
In embodiments of the present invention, the 4th switching tube Q4 is NMOS tube, and the drain electrode of NMOS tube is the 4th
The hot end of switching tube Q4, the source electrode of NMOS tube is the cold end of the 4th switching tube Q4, NMOS
The grid of pipe is the control end of the 4th switching tube Q4.
In embodiments of the present invention, the 5th switching tube Q5 is NMOS tube, and the drain electrode of NMOS tube is the 5th
The hot end of switching tube Q5, the source electrode of NMOS tube is the cold end of the 5th switching tube Q5, NMOS
The grid of pipe is the control end of the 5th switching tube Q5.
As one embodiment of the invention, feedback control module 12 also includes the first electric capacity C1, the first electric capacity C1
Positive pole connect the outfan of error amplifier U5, the minus earth of the first electric capacity C1.
As one embodiment of the invention, constant-current driven module 13 includes: the first switching tube Q1, the 3rd computing
Amplifier U6 and the first resistance R1.
First end that hot end is constant-current driven module 13 of the first switching tube Q1, the first switching tube Q1
Control termination the 3rd operational amplifier U6 outfan, the in-phase input end of the 3rd operational amplifier U6 is
The input of constant-current control module 13, the inverting input of the 3rd operational amplifier U6 and the first resistance R1
The first end be connected to the cold end of the first switching tube Q1 altogether, second end of the first resistance R1 is constant-current driving
Second end of module 13.
In embodiments of the present invention, the first switching tube Q1 is NMOS tube, and the drain electrode of NMOS tube is first
The hot end of switching tube Q1, the source electrode of NMOS tube is the cold end of the first switching tube Q1, NMOS
The grid of pipe is the control end of the first switching tube Q1.
As one embodiment of the invention, constant current driver circuit for LED 1 also includes the 3rd electric capacity C3, the 3rd electricity
The positive pole holding C3 connects the negative electrode of diode D1 and the anode of LED string 2, and the negative pole of the 3rd electric capacity C3 connects
Ground.In embodiments of the present invention, when second switch pipe Q2 turns on, the 3rd electric capacity C3 is to LED string
2 power supplies, to ensure that LED string 2 will not extinguish.
The embodiment of the present invention additionally provides a kind of LED light device, is connected with alternating current power supply AC, and LED shines
Bright device includes LED string 2, and LED light device also includes above-mentioned constant current driver circuit for LED 1.
Below in conjunction with operation principle, embodiments of the present invention is further illustrated:
As it is shown on figure 3, LED string 2 exports the Isobarically Control turn-on and turn-off by second switch pipe Q2
Realizing, second switch pipe Q2 is operated in critical conduction mode, when second switch pipe Q2 turns on, and rectification mould
The unidirectional current of block 10 output is charged (i.e. energy storage inductor L1 carries out energy storage) to energy storage inductor L1, when
When Isobarically Control module 11 turns off, LED string 2 is discharged by energy storage inductor L1 by diode D1
(i.e. energy storage inductor L1 carries out releasing energy or demagnetization).Concrete, when Continuity signal generation unit 113 is examined
Measuring that energy storage inductor L1 releases can be at the end of (demagnetization), and output Continuity signal, to control unit 111, controls single
Unit 111 controls second switch pipe Q2 conducting according to described Continuity signal, when cut-off signals generation unit 112
Detecting when the peak point current of energy storage inductor L1 reaches pre-set peak value electric current, output cut-off signals is to controlling list
Unit 111, control unit 111 controls second switch pipe Q2 according to described cut-off signals and turns off.More specifically,
3rd resistance R3 and the second electric capacity C2 composition releases energy testing circuit, at the end of energy storage inductor L1 releases energy,
First comparator U1 is by carrying out the voltage of the 3rd resistance R3 the second end and the voltage of the first reference voltage source
After Bi compare, output unlatching signal is to control unit 111, and now, control unit 111 exports high level signal
To the control end of second switch pipe Q2, to control second switch pipe Q2 conducting；When second switch pipe Q2 leads
After Tong, the second resistance R2 there is electric current to pass through, when reaching pre-set peak value electric current by the electric current of the second resistance,
When the voltage cs of i.e. second resistance R2 the first end reaches pre-set peak value voltage vt_cs, the second comparator U2 is defeated
Going out cut-off signals to control unit 111, now control unit 111 output low level signal is to second switch pipe
The control end of Q2, to control second switch pipe Q2 shutoff.
The output voltage of LED string 2 is sampled by feedback control module 13, and by sampled voltage with pre-
If reference voltage (voltage of the second reference voltage source) compares, and export the first control voltage vt_cs
With constant voltage vt_out.The output voltage of LED string 2 is the highest, the first of feedback control module 12 output
Controlling voltage vt_cs the lowest, the speed that cut-off signals generation module 112 produces cut-off signals is the fastest,
I.e. second switch pipe Q2 turns off the soonest, and so, the electric energy of energy storage inductor L1 storage is the fewest, so that
The electric energy that energy storage inductor L1 discharges to LED string 2 reduces, and the output voltage of LED string 2 reduces.Logical
Cross sampling repeatedly and the regulation repeatedly of Isobarically Control module 11 of feedback control module 12, finally make LED
The output voltage stabilization of string 2 is at preset reference voltage (voltage of the i.e. second reference voltage source).And constant current is driven
The constant voltage vt_out output constant current that dynamic model block 13 exports according to feedback control module 12 (drive by constant current
The electric current Iout=vt_out/R1 of dynamic model block 13 output) so that LED string 2 flows through constant current, thus
Eliminate the impact on LED string 2 of the working frequency ripple wave of existing high-power LED driving circuit output end current,
And then eliminate the stroboscopic phenomenon of LED.
When LED string 2 being carried out brightness regulation by SCR control switch 14, controlled by controlling
Silicon controls the cut angle of switch 14 and controls its cut to alternating current.As shown in Figure 4, SCR control is opened
The cut angle of pass 14 is the least, and it is the biggest to the cut of alternating current, and after alternating current is rectified, each gauze cycle is defeated
The galvanic meansigma methods gone out is the least so that the output voltage of LED string 2 is the least, when LED string
When the output voltage of 2 is less than preset voltage value, feedback control module 12 exports to constant-current driven module 13
Constant voltage reduces, so that the electric current of constant-current driven module 13 output reduces, i.e. flows through LED string
The electric current of 2 reduces, and LED string 2 is dimmed, thus LED string 2 can be realized brightness regulation.
Simultaneously as the outfan of rectification module 10 does not connect bulky capacitor, therefore input current phase place is followed defeated
Enter voltage-phase, therefore can realize High Power Factor.
In sum, the constant current driver circuit for LED 1 that the embodiment of the present invention provides is meeting High Power Factor
Under requirement, can realize LED without stroboscopic and the brightness regulation to LED string 2.
The constant current driver circuit for LED of this bright offer of embodiment is that High Power Factor drives electricity without stroboscopic LED
Road, including Isobarically Control module, feedback control module and constant-current driven module module, feedback control module pair
The output voltage of LED string is sampled, and sampled voltage is compared with preset reference voltage and processed
Rear output first controls voltage and constant voltage, and Isobarically Control module controls voltage according to first makes LED string
Output voltage equal with preset reference voltage, constant-current driven module according to constant voltage to flowing through LED string
Electric current carry out current constant control, thus eliminate the power frequency ripple of existing high-power LED driving circuit outfan
Impact on LED string, and then eliminate the stroboscopic phenomenon of LED.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Any amendment, equivalent and the improvement etc. made within bright spirit and principle, should be included in the present invention
Protection domain within.
Claims (10)
1. a constant current driver circuit for LED, connects with LED series winding, described constant current driver circuit for LED
Including rectification module, energy storage inductor and diode, described rectification module carries out rectification to alternating current, and exports
Unidirectional current is powered by LED string described in described energy storage inductor and described diode pair, and its feature exists
In, described constant current driver circuit for LED also includes: Isobarically Control module, feedback control module and constant-current driving
Module；
First end of described Isobarically Control module and the second end of described energy storage inductor and the anode of described diode
Connecting, the sampling end of described feedback control module is connected to described with the first end of described constant-current driven module altogether
The outfan of LED string, the first outfan of described feedback control module and the second outfan are respectively with described
The input of Isobarically Control module and the input of described constant-current driven module connect, described Isobarically Control module
The second end of the second end and described constant-current driven module be connected to ground altogether；
Described Isobarically Control module controls the energy storage of described energy storage inductor and releases energy；Described feedback control module pair
The output voltage of described LED string is sampled, and sampled voltage and preset reference voltage is compared also
Exporting the first control voltage and constant voltage after process, described Isobarically Control module controls electricity according to described first
Pressure regulate the energy storage time of described energy storage inductor and release can the time so that the output voltage of described LED string with
Described preset reference voltage is equal；Meanwhile, described constant-current driven module according to described constant voltage to flowing through
The electric current stating LED string carries out current constant control.
2. constant current driver circuit for LED as claimed in claim 1, it is characterised in that described LED constant current
Drive circuit also includes that SCR control switchs, and described SCR control switch is connected to the most defeated of alternating current power supply
Go out between end and the first input end of described rectification module, the second input of described rectification module and described friendship
The negative output terminal of stream power supply connects；
When described LED string is carried out brightness regulation, the output voltage of described LED string with described can
The cut angle that control silicon controls switch is corresponding, and described feedback control module is according to the output electricity of described LED string
Pressure exports corresponding constant voltage makes described constant-current driven module carry out the electric current flowing through described LED string
Corresponding current constant control.
3. constant current driver circuit for LED as claimed in claim 1 or 2, it is characterised in that described constant voltage
Control module includes: switch element, control unit, cut-off signals generation unit and Continuity signal generation unit；
The hot end of described switch element connects as described altogether with the first end of described Continuity signal generation unit
First end of Isobarically Control module, the second end of described Continuity signal generation unit produces with described cut-off signals
Second end of unit connects the second end as described Isobarically Control module, the cold end of described switch element altogether
It is connected with the first end of described cut-off signals generation unit, the outfan of described cut-off signals generation unit and institute
State the outfan of Continuity signal generation unit respectively with first input end and second input of described control unit
Connecting, the outfan of described control unit is connected with the control end of described switch element, and described cut-off signals produces
The input that input is described Isobarically Control module of raw unit；
Described Continuity signal generation unit, at the end of detecting that described energy storage inductor releases energy, exports Continuity signal
To described control unit, described control unit controls described switching means conductive according to described Continuity signal；Institute
State cut-off signals generation unit when the peak point current described energy storage inductor being detected reaches pre-set peak value electric current,
Output cut-off signals controls described switch to described control unit, described control unit according to described cut-off signals
Unit turns off.
4. constant current driver circuit for LED as claimed in claim 3, it is characterised in that described Continuity signal
Generation unit includes the 3rd resistance, the second electric capacity, the first comparator and the first reference voltage source；
First end that first end is described Continuity signal generation unit of described 3rd resistance, described second electric capacity
The second end that negative pole is described Continuity signal generation unit, second end and described second of described 3rd resistance
The positive pole of electric capacity is connected to the in-phase input end of described first comparator, the anti-phase input of described first comparator altogether
End is connected with described first reference voltage source, and the outfan of described first comparator is that described Continuity signal produces
The outfan of unit.
5. constant current driver circuit for LED as claimed in claim 3, it is characterised in that described cut-off signals
Generation unit includes the second comparator and the second resistance；
The in-phase input end of described second comparator is the input of described cut-off signals generation unit, described
The inverting input of two comparators connects as the generation of described cut-off signals single with the first end of described second resistance altogether
First end of unit, the second end of described second resistance is the second end of described cut-off signals generation unit, described
The outfan of the second comparator is the outfan of described cut-off signals generation unit.
6. constant current driver circuit for LED as claimed in claim 3, it is characterised in that described control unit
Including rest-set flip-flop and phase inverter；
The set end of described rest-set flip-flop and reset terminal are respectively the first input end and of described control unit
Two inputs, the in-phase output end of described rest-set flip-flop is connected with the input of described phase inverter, described instead
The outfan of phase device is the outfan of described control unit.
7. constant current driver circuit for LED as claimed in claim 1 or 2, it is characterised in that described feedback
Control module includes the second reference voltage source, error amplifier and voltage regulation unit；
The in-phase input end of described error amplifier is connected with described second reference voltage source, and described error is amplified
The inverting input of device is the sampling end of described feedback control module, and the output of described error amplifier terminates institute
State the input of voltage regulation unit, the first outfan of described voltage regulation unit and the second outfan be respectively described instead
First outfan of feedback control module and the second outfan.
8. constant current driver circuit for LED as claimed in claim 7, it is characterised in that described voltage regulation unit
Including: the 3rd switching tube, the 4th resistance, the 5th resistance, the 6th resistance, the first operational amplifier, second
Operational amplifier, the second reference voltage source, the 4th switching tube, the 7th resistance and the 8th resistance；
The input that control end is described voltage regulation unit of described 3rd switching tube, the height of described 3rd switching tube
Current potential termination power, the electronegative potential of described 3rd switching tube terminates the first end of described 4th resistance, and described the
The homophase that second end of four resistance is connected to described first operational amplifier altogether with the first end of described 5th resistance is defeated
Entering end, the second end of described 5th resistance and the first end of described 6th resistance connect altogether as described voltage regulation unit
The first outfan, the second end ground connection of described 6th resistance, described 4th switching tube high potential termination electricity
Source, the outfan controlling described first operational amplifier of termination of described 4th switching tube, described first computing
First end of the inverting input of amplifier and described 7th resistance is connected to the electronegative potential of described 4th switching tube altogether
End, the second end of described 7th resistance and the first end of described 8th resistance are connected to described second operation amplifier altogether
The inverting input of device, the input in the same direction of described second operational amplifier terminates described second reference voltage source,
The outfan of described second operational amplifier connects as described voltage regulation unit altogether with the second end of described 8th resistance
The second outfan.
9. constant current driver circuit for LED as claimed in claim 1 or 2, it is characterised in that described constant current
Driving module includes: the first switching tube, the 3rd operational amplifier and the first resistance；
First end that hot end is described constant-current driven module of described first switching tube, described first switch
The outfan controlling described 3rd operational amplifier of termination of pipe, the homophase input of described 3rd operational amplifier
End is the controlled end of described constant-current control module, the inverting input of described 3rd operational amplifier and described the
First end of one resistance is connected to the cold end of described first switching tube altogether, and the second end of described first resistance is
Second end of described constant-current driven module.
10. a LED light device, is connected with alternating current power supply, and includes LED string, and its feature exists
In, described LED light device also includes that the LED constant current as described in claim 1-9 any one drives
Circuit.
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| CN201610527874.1A CN105979662B (en) | 2016-07-06 | 2016-07-06 | A kind of constant current driver circuit for LED and LED light device |
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| CN201610527874.1A CN105979662B (en) | 2016-07-06 | 2016-07-06 | A kind of constant current driver circuit for LED and LED light device |
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| CN108112129A (en) * | 2018-01-10 | 2018-06-01 | 生迪智慧科技有限公司 | Constant current driver circuit for LED |
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| CN108112129B (en) * | 2018-01-10 | 2023-12-12 | 生迪智慧科技有限公司 | LED constant current driving circuit |
| CN108650738A (en) * | 2018-06-06 | 2018-10-12 | 深圳市巴丁微电子有限公司 | A kind of LED control circuit |
| CN108650738B (en) * | 2018-06-06 | 2024-04-23 | 深圳率能半导体有限公司 | LED control circuit |
| CN108966459A (en) * | 2018-07-27 | 2018-12-07 | 深圳市明微电子股份有限公司 | A kind of intelligent dimming control circuit and system |
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| CN108966459B (en) * | 2018-07-27 | 2023-09-12 | 深圳市明微电子股份有限公司 | Intelligent dimming control circuit and system |
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| CN108712807B (en) * | 2018-08-03 | 2024-01-09 | 美智光电科技股份有限公司 | Driving circuit of light emitting diode |
| CN108712807A (en) * | 2018-08-03 | 2018-10-26 | 江西美的贵雅照明有限公司 | The driving circuit of light emitting diode |
| CN111263490A (en) * | 2018-11-30 | 2020-06-09 | 松下知识产权经营株式会社 | Load controller |
| CN111263490B (en) * | 2018-11-30 | 2022-03-29 | 松下知识产权经营株式会社 | Load controller |
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| CN109348587A (en) * | 2018-12-14 | 2019-02-15 | 上海源微电子科技有限公司 | A kind of constant current driver circuit for LED with high PF without stroboscopic |
| CN109600880A (en) * | 2018-12-18 | 2019-04-09 | 陕西亚成微电子股份有限公司 | A kind of no stroboscopic LED driving method and circuit |
| CN109600880B (en) * | 2018-12-18 | 2024-03-26 | 陕西亚成微电子股份有限公司 | Stroboscopic-free LED driving method and circuit |
| CN111642041A (en) * | 2019-03-01 | 2020-09-08 | 华润矽威科技（上海）有限公司 | Linear LED driving circuit, system and driving method thereof |
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