CN105979662B - A kind of constant current driver circuit for LED and LED light device - Google Patents
A kind of constant current driver circuit for LED and LED light device Download PDFInfo
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- CN105979662B CN105979662B CN201610527874.1A CN201610527874A CN105979662B CN 105979662 B CN105979662 B CN 105979662B CN 201610527874 A CN201610527874 A CN 201610527874A CN 105979662 B CN105979662 B CN 105979662B
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- 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 LED drive controls field, there is provided a kind of constant current driver circuit for LED and LED light device.The constant current driver circuit for LED is High Power Factor without stroboscopic LED drive circuit, including Isobarically Control module, feedback control module and constant-current driven module module, feedback control module samples to the output voltage of LED string, and export the first control voltage and constant voltage by sampled voltage compared with preset reference voltage and after handling, Isobarically Control module makes the output voltage of LED string equal with preset reference voltage according to the first control voltage, constant-current driven module carries out current constant control according to constant voltage to the electric current for flowing through LED string, so as to eliminate influence of the working frequency ripple wave of existing conventional high power LED drive circuit output end current to LED string, and then eliminate LED stroboscopic phenomenon.
Description
Technical field
The invention belongs to LED drive controls field, more particularly to a kind of constant current driver circuit for LED and LED light device.
Background technology
At present, LED (Light Emitting Diode, light emitting diode) is used as a kind of new type light source, because it has
Energy consumption is low, brightness is strong and the advantages of long lifespan, has been widely used in every field.LED is typical current mode device, its
Stability requirement to operating current is very high, if power frequency ripple in LED electric current be present for driving, LED can be caused to go out
Existing stroboscopic phenomenon, and people's long-term work can produce visual fatigue under the light source of stroboscopic.
Existing no stroboscopic LED drive circuit is that the AC rectification for inputting power network is filtered into direct current to drive LED,
So as to realize LED without stroboscopic, but because the input of existing no stroboscopic LED drive circuit is terminated with bulky capacitor, cause whole electricity
The power factor on road is very low, so can cause a certain degree of harmonic pollution to public gauze.And in order to meet high power because
Several requirements, the input of existing High Power Factor LED drive circuit does not connect electric capacity typically, but can so cause its output end
Electric current exist very big power frequency ripple, can not realize LED without stroboscopic.
In summary, the existing High Power Factor LED drive circuit power frequency ripple larger because output end current is present and
Lead to not to realize LED without stroboscopic.
The content 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 solves existing height
Power factor LED drive circuit output end current is present larger power frequency ripple because leading to not realize LED asking without stroboscopic
Topic.
The present invention is achieved in that a kind of constant current driver circuit for LED, is connect with LED series winding, the LED constant current driving
Circuit includes rectification module, energy storage inductor and diode, and the rectification module carries out rectification to alternating current, and exports direct current and lead to
Cross the energy storage inductor and the diode pair LED string is powered, the constant current driver circuit for LED also includes：Constant pressure control
Molding block, feedback control module and constant-current driven module；
The first end of the Isobarically Control module is connected with the anode at the second end of the energy storage inductor and the diode,
The first end of the sampling end of the feedback control module and the constant-current driven module is connected to the output end of the LED string altogether,
The first output end and the second output end of the feedback control module respectively with the input of the Isobarically Control module and described
The input connection of constant-current driven module, the second end of the Isobarically Control module is total to the second end of the constant-current driven module
It is connected to ground；
The Isobarically Control module controls the energy storage of the energy storage inductor and releases energy；The feedback control module is to described
The output voltage of LED string is sampled, and sampled voltage is exported into first compared with preset reference voltage and after handling
Control voltage and constant voltage, the Isobarically Control module adjust the energy storage of the energy storage inductor according to first control voltage
Time and release can the time so that the output voltage of the LED string is equal with the preset reference voltage；Meanwhile the constant current
Drive module carries out current constant control according to the constant voltage to the electric current for flowing through the LED string.
Present invention also offers a kind of LED light device, it is connected with AC power, and is shone including LED string, the LED
Bright device also includes above-mentioned constant current driver circuit for LED.
Constant current driver circuit for LED provided by the invention is High Power Factor without stroboscopic LED drive circuit, including Isobarically Control
Module, feedback control module and constant-current driven module module, feedback control module sample to the output voltage of LED string,
And export the first control voltage and constant voltage, Isobarically Control by sampled voltage compared with preset reference voltage and after handling
Module makes that the output voltage of LED string is equal with preset reference voltage, and constant-current driven module is according to perseverance according to the first control voltage
Determine voltage and current constant control is carried out to the electric current for flowing through LED string, so as to eliminate existing high-power LED driving circuit output end
Influence of the electric current working frequency ripple wave to LED string, and then eliminate LED stroboscopic phenomenon.
Brief description of the drawings
Fig. 1 is the modular structure schematic diagram of constant current driver circuit for LED provided in an embodiment of the present invention；
Fig. 2 is the modular structure schematic diagram for the constant current driver circuit for LED that another embodiment of the present invention provides；
Fig. 3 is the electrical block diagram of constant current driver circuit for LED provided in an embodiment of the present invention；
Fig. 4 is the different cut angle institutes that SCR control switchs in constant current driver circuit for LED provided in an embodiment of the present invention
The waveform diagram of corresponding input voltage, input current and output current.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The constant current driver circuit for LED that this hair embodiment provides is High Power Factor without stroboscopic LED drive circuit, including constant pressure
Control module, feedback control module and constant-current driven module module, feedback control module are adopted to the output voltage of LED string
Sample, and export the first control voltage and constant voltage, constant pressure by sampled voltage compared with preset reference voltage and after handling
Control module makes the output voltage of LED string equal with preset reference voltage according to the first control voltage, constant-current driven module root
Current constant control is carried out to the electric current for flowing through LED string according to constant voltage, so as to eliminate existing high-power LED driving circuit output
Influence of the working frequency ripple wave of electric current to LED string is held, and then eliminates LED stroboscopic phenomenon.
Fig. 1 shows the modular structure of constant current driver circuit for LED provided in an embodiment of the present invention, for convenience of description, only
The part related to the embodiment of the present invention is shown, 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 includes rectification module 10, storage
Energy inductance L1 and diode D1, rectification module 10 carries out rectification to alternating current, and exports direct current and pass through energy storage inductor L1 and two
Pole pipe D1 is powered to LED string 2.Wherein, the moon of LED string 2 by multiple light emitting diodes according to a upper light emitting diode
The form that pole connects the anode of next light emitting diode is followed in series to form, the anode of first light emitting diode in LED string 2
For the input of LED string 2, the negative electrode of last light emitting diode is the output end of LED string 2 in LED string 2.
Constant current driver circuit for LED 1 also includes：Isobarically Control module 11, feedback control module 12 and constant-current driven module 13.
The first end of Isobarically Control module 11 is connected with energy storage inductor L1 the second end and diode D1 anode, feedback control
The sampling end of molding block 12 is connected to the output end of LED string 2, feedback control module 12 with the first end of constant-current driven module 13 altogether
The first output end and the second output end respectively with the input of Isobarically Control module 11 and the input of constant-current driven module 13
Connection, the second end of Isobarically Control module 11 are connected to ground altogether with the second end of constant-current driven module 13.
Isobarically Control module 11 controls energy storage inductor L1 energy storage and releases energy by turn-on and turn-off；Feedback control module
The output voltage of 12 pairs of LED strings 2 is sampled, and sampled voltage is exported compared with preset reference voltage and after handling
First control voltage and constant voltage, Isobarically Control module 11 adjust energy storage inductor L1 energy storage time according to the first control voltage
With release can the time so that the output voltage of LED string 2 is equal with preset reference voltage；Meanwhile constant-current driven module 13 is according to perseverance
Determine voltage and current constant control is carried out to the electric current for flowing through LED string 2.
In embodiments of the present invention, the first output end of rectification module 10 is connected with energy storage inductor L1 first end, energy storage
Inductance L1 the second end is connected with diode D1 anode, and diode D1 negative electrode is connected with the input of LED string 2, rectification
The ground connection of second output of module 10.In actual applications, rectification module 10 can be bridge rectifier.
In embodiments of the present invention, when Isobarically Control module 11 turns on, the direct current that rectification module 10 exports is to energy storage
Inductance L1 is charged (i.e. energy storage inductor L1 carries out energy storage), and when Isobarically Control module 11 turns off, energy storage inductor L1 passes through two
Pole pipe D1 is discharged LED string 2 (i.e. energy storage inductor L1 carries out releasing energy or demagnetization).When the output voltage of LED string 2 is higher
When, the first control voltage that feedback control module 12 exports is lower, and Isobarically Control module makes energy storage electric according to the first control voltage
The energy storage time for feeling L1 reduces, so that energy storage inductor L1 is reduced to the electric energy that LED string 2 discharges, the output electricity of LED string 2
Pressure drop is low, and vice versa.By the sampling repeatedly and the regulation repeatedly of Isobarically Control module 11 of feedback control module 12, finally make
The output voltage stabilization of LED string 2 is in preset reference voltage.And what constant-current driven module 13 exported according to feedback control module 12
Constant voltage exports constant current, so that LED string 2 flows through constant current, so as to eliminate existing high-power LED driving circuit
Influence of the working frequency ripple wave of output end current to LED string 2, and then eliminate LED stroboscopic phenomenon.
As one embodiment of the invention, constant current driver circuit for LED 1 also includes SCR control switch 14, SCR control
Switch 14 is connected between AC power AC positive output end and the first input end of rectification module 10, and the second of rectification module 10
Input is connected with AC power AC negative output terminal.
When carrying out brightness regulation to LED string 2, the cut of the output voltage and SCR control switch 14 of LED string 2
Angle is corresponding, and the root tuber of feedback control mould 12 exports corresponding constant voltage according to the output voltage of LED string 2 makes constant-current driven module
13 pairs of electric currents for flowing through LED string 2 carry out corresponding current constant control.
In embodiments of the present invention, it can be controlled to alternating current by controlling the cut angle of SCR control switch 14
Cut.The cut angle of SCR control switch is smaller, and its cut to alternating current is bigger, each gauze week after alternating current is rectified
The average value of the direct current of phase output is with regard to smaller so that the output voltage of LED string 2 is smaller, when the output voltage of LED string 2
During less than preset voltage value, feedback control module 12 is exported to the constant voltage reduction of constant-current driven module 13, so that permanent
Flow the electric current that drive module 13 exports to reduce, that is, the electric current for flowing through LED string 2 reduces, and LED string 2 is dimmed, thus can be to LED
Lamp string 2 realizes brightness regulation.
Fig. 2 shows the modular structure for the constant current driver circuit for LED 1 that another embodiment of the present invention provides, for the ease of saying
It is bright, the part related to the embodiment of the present invention is illustrate only, details are as follows：
As one embodiment of the invention, Isobarically Control module 11 includes：Switch element 110, control unit 111, shut-off letter
Number generation unit 111 and Continuity signal generation unit 113.
Wherein, the first end of the hot end of switch element 110 and Continuity signal generation unit 113 connects as constant pressure control altogether
The first end of molding block 11, the second end of Continuity signal generation unit 113 connect altogether with the second end of cut-off signals generation unit 112
As the second end of Isobarically Control module 11, the cold end of switch element 110 and the first end of cut-off signals generation unit 112
Connection, the output end of cut-off signals generation unit 112 and the output end of Continuity signal generation unit 113 respectively with control unit
111 first input end and the connection of the second input, the output end of control unit 111 are connected with the control terminal of switch element 110,
The input of cut-off signals generation unit 112 is the input of Isobarically Control module 11.
Continuity signal generation unit 113 is at the end of detecting that energy storage inductor L1 releases energy (demagnetization), and output Continuity signal is extremely
Control unit 111, so that the controlling switch unit 110 of control unit 111 turns on.Cut-off signals generation unit 112 is detecting storage
When energy inductance L1 peak point current reaches pre-set peak value electric current, output cut-off signals are to control unit 111, so that control unit
111 controlling switch units 110 turn off.
As one embodiment of the invention, feedback control module 12 include the second reference voltage source 120, error amplifier U5 and
Voltage regulation unit 121.
Wherein, error amplifier U5 in-phase input end is connected with the second reference voltage source 120, and error amplifier U5's is anti-
Phase input is the sampling end of feedback control module 12, and error amplifier U5 output terminates the input of voltage regulation unit 121, surely
It is respectively that the first output end of feedback control module 12 and second export to press the first output end of unit 121 and the second output end
End.
Fig. 3 shows the circuit structure of constant current driver circuit for LED 1 provided in an embodiment of the present invention, for convenience of description, only
The part related to the embodiment of the present invention is shown, details are as follows：
As one embodiment of the invention, switch element 112 is NMOS tube Q2, and NMOS tube Q2 drain electrode is switch element 112
Hot end, NMOS tube Q2 source electrode is the cold end of switch element 112, and NMOS tube Q2 grid is switch element 112
Control terminal.
As one embodiment of the invention, Continuity signal generation unit 113 includes 3rd resistor R3, the second electric capacity C2, first
Comparator U1 and the first reference voltage source 1130.
Wherein, 3rd resistor R3 first end be Continuity signal generation unit 113 first end, the second electric capacity C2 negative pole
For the second end of Continuity signal generation unit 113,3rd resistor R3 the second end and the second electric capacity C2 positive pole are connected to first altogether
Comparator U1 in-phase input end, first comparator U1 inverting input are connected with the first reference voltage source 1130, the first ratio
Output end compared with device U1 is the output end of Continuity signal generation unit 113.
As one embodiment of the invention, cut-off signals generation unit 112 includes the second comparator U2 and second resistance R2.
Second comparator U2 in-phase input end is the input of cut-off signals generation unit 112, the second comparator U2's
Inverting input and second resistance R2 first end meet the first end as cut-off signals generation unit 112, second resistance R2 altogether
The second end be cut-off signals generation unit 112 the second end, the second comparator U2 output end is cut-off signals generation unit
112 output end.
As one embodiment of the invention, control unit 111 includes rest-set flip-flop U7 and phase inverter U8.
Rest-set flip-flop U7 set end S and reset terminal R is respectively first input end and the second input of control unit 111
End, rest-set flip-flop U7 in-phase output end Q are connected with phase inverter U8 input, and phase inverter U8 output end is control unit
111 output end.
As one embodiment of the invention, voltage regulation unit 121 includes：3rd switching tube Q3, the 4th resistance R4, the 5th resistance
R5, the 6th resistance R6, the first operational amplifier U3, the second operational amplifier U4, the 3rd reference voltage source 1210, the 4th switching tube
Q4, the 7th resistance R7 and the 8th resistance R8.
3rd switching tube Q3 control terminal is the input of voltage regulation unit 121, and the 3rd switching tube Q3 high potential termination is electric
Source VCC, the 3rd switching tube Q3 low potential terminate the 4th resistance R4 first end, the 4th resistance R4 the second end and the 5th resistance
R5 first end is connected to the first operational amplifier U3 in-phase input end altogether, and the 5th resistance R5 the second end is with the 6th resistance R6's
First end connects the first output end as voltage regulation unit 121, the 6th resistance R6 the second end ground connection, the 4th switching tube Q4 height altogether
Current potential termination power VCC, the 4th switching tube Q4 the first operational amplifier U3 of control termination output end, the first operational amplifier
U3 inverting input and the 7th resistance R7 first end are connected to the 4th switching tube Q4 cold end altogether, and the of the 7th resistance R7
Two ends and the 8th resistance R8 first end are connected to the second operational amplifier U4 inverting input altogether, the second operational amplifier U4's
The 3rd reference voltage source 1210 of input termination in the same direction, the second operational amplifier U4 output end and the 8th resistance R8 the second end are total to
Connect the second output end as voltage regulation unit 121.
In embodiments of the present invention, the 4th switching tube Q4 is NMOS tube, and the drain electrode of NMOS tube is the 4th switching tube Q4 height
Potential end, the source electrode of NMOS tube are the 4th switching tube Q4 cold end, and the grid of NMOS tube is the 4th switching tube Q4 control
End.
In embodiments of the present invention, the 5th switching tube Q5 is NMOS tube, and the drain electrode of NMOS tube is the 5th switching tube Q5 height
Potential end, the source electrode of NMOS tube are the 5th switching tube Q5 cold end, and the grid of NMOS tube is the 5th switching tube Q5 control
End.
As one embodiment of the invention, feedback control module 12 also includes the first electric capacity C1, and the first electric capacity C1 positive pole connects
Error amplifier U5 output end, the first electric capacity C1 negative pole ground connection.
As one embodiment of the invention, constant-current driven module 13 includes：First switch pipe Q1, the 3rd operational amplifier U6 and
First resistor R1.
First switch pipe Q1 hot end is the first end of constant-current driven module 13, and first switch pipe Q1 control terminates
3rd operational amplifier U6 output end, the 3rd operational amplifier U6 in-phase input end are the input of constant-current control module 13
End, the 3rd operational amplifier U6 inverting input are connected to first switch pipe Q1 low potential with first resistor R1 first end altogether
End, first resistor R1 the second end are the second end of constant-current driven module 13.
In embodiments of the present invention, first switch pipe Q1 is NMOS tube, and the drain electrode of NMOS tube is first switch pipe Q1 height
Potential end, the source electrode of NMOS tube are first switch pipe Q1 cold end, and the grid of NMOS tube is first switch pipe Q1 control
End.
As one embodiment of the invention, constant current driver circuit for LED 1 also includes the 3rd electric capacity C3, the 3rd electric capacity C3 positive pole
Connect diode D1 negative electrode and the anode of LED string 2, the 3rd electric capacity C3 negative pole ground connection.In embodiments of the present invention, when second
When switching tube Q2 is turned on, the 3rd electric capacity C3 powers to LED string 2, 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 AC power AC, LED light device includes
LED string 2, LED light device also include above-mentioned constant current driver circuit for LED 1.
Below in conjunction with operation principle, embodiments of the present invention is further illustrated：
As shown in figure 3, LED string 2 exports Isobarically Control realizes that second opens by second switch pipe Q2 turn-on and turn-off
Close pipe Q2 and be operated in critical conduction mode, when second switch pipe Q2 is turned on, the direct current that rectification module 10 exports is to energy storage electricity
Sense L1 is charged (i.e. energy storage inductor L1 carries out energy storage), and when Isobarically Control module 11 turns off, energy storage inductor L1 passes through two poles
Pipe D1 is discharged LED string 2 (i.e. energy storage inductor L1 carries out releasing energy or demagnetization).Specifically, work as Continuity signal generation unit
At the end of detecting that energy storage inductor L1 releases energy (demagnetization) in 113, output Continuity signal to control unit 111, control unit 111
According to Continuity signal control second switch pipe Q2 conductings, when cut-off signals generation unit 112 detects energy storage inductor L1 peak
When value electric current reaches pre-set peak value electric current, output cut-off signals to control unit 111, control unit 111 is believed according to the shut-off
Number control second switch pipe Q2 shut-off.More specifically, 3rd resistor R3 and the second electric capacity C2, which forms to release, can detect circuit, work as energy storage
At the end of inductance L1 releases energy, first comparator U1 is by by the electricity of the voltage at the ends of 3rd resistor R3 second and the first reference voltage source
After pressure is compared, output open signal to control unit 111, now, the output high level signal of control unit 111 to second are opened
Pipe Q2 control terminal is closed, to control second switch pipe Q2 to turn on；After second switch pipe Q2 is turned on, there is electric current on second resistance R2
By the way that when the electric current by second resistance reaches pre-set peak value electric current, i.e. the voltage cs of second resistance R2 first ends reaches default
During crest voltage vt_cs, the second comparator U2 exports cut-off signals to control unit 111, and now control unit 111 exports low electricity
Ordinary mail number to second switch pipe Q2 control terminal, with control second switch pipe Q2 turn off.
Feedback control module 13 samples to the output voltage of LED string 2, and by sampled voltage and preset reference voltage
(voltage of the second reference voltage source) is compared, and exports the first control voltage vt_cs and constant voltage vt_out.LED
The output voltage of string 2 is higher, and the first control voltage vt_cs that feedback control module 12 exports is lower, and cut-off signals produce mould
The speed that block 112 produces cut-off signals is faster, i.e. the faster shut-offs of second switch pipe Q2, so, energy storage inductor L1 storages
Electric energy is fewer, so that energy storage inductor L1 is reduced to the electric energy that LED string 2 discharges, the output voltage of LED string 2 reduces.It is logical
The sampling repeatedly and the regulation repeatedly of Isobarically Control module 11 of feedback control module 12 are crossed, finally makes the output voltage of LED string 2
Stabilization is at preset reference voltage (i.e. the voltage of the second reference voltage source).And constant-current driven module 13 is according to feedback control module 12
The constant voltage vt_out outputs constant current (the electric current Iout=vt_out/R1 that constant-current driven module 13 exports) of output, with
LED string 2 is set to flow through constant current, so as to eliminate the working frequency ripple wave pair of existing high-power LED driving circuit output end current
The influence of LED string 2, and then eliminate LED stroboscopic phenomenon.
When switching 14 pairs of progress brightness regulations of LED strings 2 by SCR control, by controlling SCR control to switch
14 cut angle controls its cut to alternating current.As shown in figure 4, the cut angle of SCR control switch 14 is smaller, its is right
The cut of alternating current is bigger, and the average value of the direct current of each gauze cycle output is with regard to smaller after alternating current is rectified so that LED
The output voltage of lamp string 2 is smaller, when the output voltage of LED string 2 is less than preset voltage value, feedback control module 12 export to
The constant voltage of constant-current driven module 13 reduces, so that the electric current that constant-current driven module 13 exports reduces, that is, flows through LED
The electric current of string 2 reduces, and LED string 2 is dimmed, thus can realize brightness regulation to LED string 2.
Simultaneously as the output end of rectification module 10 does not connect bulky capacitor, therefore input current phase follows input voltage
Phase, therefore High Power Factor can be realized.
In summary, constant current driver circuit for LED 1 provided in an embodiment of the present invention is under the requirement for meeting High Power Factor,
The LED brightness regulation without stroboscopic and to LED string 2 can be achieved.
The constant current driver circuit for LED of the bright offer of this hair embodiment is High Power Factor without stroboscopic LED drive circuit, including perseverance
Control module, feedback control module and constant-current driven module module are pressed, feedback control module is carried out to the output voltage of LED string
Sampling, and the first control voltage and constant voltage are exported by sampled voltage compared with preset reference voltage and after handling, it is permanent
Voltage-controlled molding root tuber makes the output voltage of LED string equal with preset reference voltage according to the first control voltage, constant-current driven module
Current constant control is carried out to the electric current for flowing through LED string according to constant voltage, it is defeated so as to eliminate existing high-power LED driving circuit
Go out influence of the power frequency ripple at end to LED string, and then eliminate LED stroboscopic phenomenon.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of constant current driver circuit for LED, connect with LED series winding, the constant current driver circuit for LED includes rectification module, energy storage
Inductance and diode；First output end of the rectification module is connected with the first end of the energy storage inductor, the energy storage inductor
The second end be connected with the anode of the diode, the negative electrode of the diode is connected with the input of the LED string, described
Second output head grounding of rectification module；The rectification module carries out rectification to alternating current, and exports direct current and pass through the storage
LED string described in energy inductance and the diode pair is powered, it is characterised in that the constant current driver circuit for LED also includes：
Isobarically Control module, feedback control module and constant-current driven module；
The first end of the Isobarically Control module is connected with the anode at the second end of the energy storage inductor and the diode, described
The first end of the sampling end of feedback control module and the constant-current driven module is connected to the output end of the LED string altogether, described
The input with the Isobarically Control module and the constant current respectively of the first output end and the second output end of feedback control module
The input connection of drive module, the second end of the Isobarically Control module is connected to altogether with the second end of the constant-current driven module
Ground；
The Isobarically Control module controls the energy storage of the energy storage inductor and releases energy；The feedback control module is to the LED
The output voltage of string is sampled, and the first control electricity is exported by sampled voltage compared with preset reference voltage and after handling
Pressure and constant voltage, the Isobarically Control module according to first control voltage adjust the energy storage inductor energy storage time and
The energy time is released, so that the output voltage of the LED string is equal with the preset reference voltage；Meanwhile the constant current driving mould
Root tuber carries out current constant control according to the constant voltage to the electric current for flowing through the LED string；
The Isobarically Control module includes：Switch element, control unit, cut-off signals generation unit and Continuity signal produce single
Member；
The first end of the hot end of the switch element and the Continuity signal generation unit connects as the Isobarically Control altogether
The first end of module, the second end of the Continuity signal generation unit and the second end of the cut-off signals generation unit connect work altogether
For the second end of the Isobarically Control module, the cold end of the switch element and the first of the cut-off signals generation unit
End connection, the output end of the output end of the cut-off signals generation unit and the Continuity signal generation unit respectively with the control
The first input end of unit processed and the connection of the second input, the output end of described control unit and the control terminal of the switch element
Connection, the input of the cut-off signals generation unit are the input of the Isobarically Control module；
The Continuity signal generation unit is at the end of detecting that the energy storage inductor releases energy, output Continuity signal to the control
Unit, described control unit control the switching means conductive according to the Continuity signal；The cut-off signals generation unit exists
When detecting that the peak point current of the energy storage inductor reaches pre-set peak value electric current, output cut-off signals to described control unit, institute
State control unit controls the switch element to turn off according to the cut-off signals.
2. constant current driver circuit for LED as claimed in claim 1, it is characterised in that the constant current driver circuit for LED also includes can
Control silicon controlling switch, it is first defeated to be connected to the positive output end of AC power and the rectification module for SCR control switch
Between entering end, the second input of the rectification module is connected with the negative output terminal of the AC power；
When carrying out brightness regulation to the LED string, output voltage and the SCR control switch of the LED string
Cut angle is corresponding, and the feedback control module exports corresponding constant voltage according to the output voltage of the LED string makes institute
State constant-current driven module and corresponding current constant control is carried out to the electric current for flowing through the LED string.
3. constant current driver circuit for LED as claimed in claim 1, it is characterised in that the Continuity signal generation unit includes the
Three resistance, the second electric capacity, first comparator and the first reference voltage source；
The first end of the 3rd resistor is the first end of the Continuity signal generation unit, and the negative pole of second electric capacity is institute
State the second end of Continuity signal generation unit, the positive pole of the second end of the 3rd resistor and second electric capacity is connected to described altogether
The in-phase input end of first comparator, the inverting input of the first comparator are connected with first reference voltage source, institute
The output end for stating first comparator is the output end of the Continuity signal generation unit.
4. constant current driver circuit for LED as claimed in claim 1, it is characterised in that the cut-off signals generation unit includes the
Two comparators and second resistance；
The in-phase input end of second comparator is the input of the cut-off signals generation unit, second comparator
The first end of inverting input and the second resistance connects the first end as the cut-off signals generation unit altogether, and described second
Second end of resistance is the second end of the cut-off signals generation unit, and the output end of second comparator is believed for the shut-off
The output end of number generation unit.
5. constant current driver circuit for LED as claimed in claim 1, it is characterised in that described control unit include rest-set flip-flop and
Phase inverter；
The set end and reset terminal of the rest-set flip-flop are respectively the first input end and the second input of described control unit, institute
The in-phase output end for stating rest-set flip-flop is connected with the input of the phase inverter, and the output end of the phase inverter is single for the control
The output end of member.
6. constant current driver circuit for LED as claimed in claim 1 or 2, it is characterised in that the feedback control module includes second
Reference voltage source, error amplifier and voltage regulation unit；
The in-phase input end of the error amplifier is connected with second reference voltage source, the error amplifier it is anti-phase defeated
Entering sampling end of the end for the feedback control module, the output of the error amplifier terminates the input of the voltage regulation unit,
The first output end and the second output end of the voltage regulation unit are respectively the first output end and second of the feedback control module
Output end.
7. constant current driver circuit for LED as claimed in claim 6, it is characterised in that the voltage regulation unit includes：3rd switch
Pipe, the 4th resistance, the 5th resistance, the 6th resistance, the first operational amplifier, the second operational amplifier, the second reference voltage source,
Four switching tubes, the 7th resistance and the 8th resistance；
The control terminal of 3rd switching tube is the input of the voltage regulation unit, and the high potential termination of the 3rd switching tube is electric
Source, the low potential of the 3rd switching tube terminate the first end of the 4th resistance, the second end of the 4th resistance with it is described
The first end of 5th resistance is connected to the in-phase input end of first operational amplifier, the second end of the 5th resistance and institute altogether
The first end for stating the 6th resistance connects the first output end as the voltage regulation unit altogether, the second end ground connection of the 6th resistance,
The high potential termination power of 4th switching tube, the control of the 4th switching tube terminate the defeated of first operational amplifier
Go out end, the first end of the inverting input of first operational amplifier and the 7th resistance is connected to the 4th switching tube altogether
Cold end, the second end of the 7th resistance and the first end of the 8th resistance are connected to second operational amplifier altogether
Inverting input, the input in the same direction of second operational amplifier terminates second reference voltage source, second computing
Second end of the output end of amplifier and the 8th resistance connects the second output end as the voltage regulation unit altogether.
8. constant current driver circuit for LED as claimed in claim 1 or 2, it is characterised in that the constant-current driven module includes：The
One switching tube, the 3rd operational amplifier and first resistor；
The hot end of the first switch pipe be the constant-current driven module first end, the control terminal of the first switch pipe
The output end of the 3rd operational amplifier is connect, the in-phase input end of the 3rd operational amplifier is the constant-current control module
Controlled end, the inverting input of the 3rd operational amplifier and the first end of the first resistor are connected to described first and opened altogether
The cold end of pipe is closed, the second end of the first resistor is the second end of the constant-current driven module.
9. a kind of LED light device, is connected with AC power, and including LED string, it is characterised in that the LED light device
Also include the constant current driver circuit for LED as described in claim 1-8 any one.
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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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| CN105979662B true CN105979662B (en) | 2018-02-16 |
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| CN111642041B (en) * | 2019-03-01 | 2022-11-08 | 华润微集成电路(无锡)有限公司 | Linear LED driving circuit, system and driving method thereof |
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| CN112788812B (en) * | 2019-11-07 | 2023-07-18 | 华润微集成电路(无锡)有限公司 | Linear LED driving system and driving method |
| CN110740544A (en) * | 2019-12-09 | 2020-01-31 | 深圳市晟碟半导体有限公司 | dimming circuit, device and dimming method for reducing silicon controlled rectifier dimming stroboflash |
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