CN205793545U - 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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- CN205793545U CN205793545U CN201620706768.5U CN201620706768U CN205793545U CN 205793545 U CN205793545 U CN 205793545U CN 201620706768 U CN201620706768 U CN 201620706768U CN 205793545 U CN205793545 U CN 205793545U
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Abstract
This utility model belongs to LED and drives control field, it is provided that a kind of constant current driver circuit for LED and LED light device.This constant current driver circuit for LED is that High Power Factor is without stroboscopic LED drive circuit, including Isobarically Control module, feedback control module and constant-current driven module module, the output voltage of LED string is sampled by feedback control module, and after sampled voltage and preset reference voltage are compared and processed, export the first control voltage and constant voltage, Isobarically Control module controls voltage according to first makes the output voltage of LED string equal with preset reference voltage, constant-current driven module carries out current constant control according to constant voltage to the electric current flowing through LED string, thus eliminate the impact on LED string of the working frequency ripple wave of existing conventional high power LED drive circuit output end current, and then eliminate the stroboscopic phenomenon of LED.
Description
Technical field
This utility model belongs to LED and drives control field, particularly relates to a kind of constant current driver circuit for LED and LED illumination dress
Put.
Background technology
At present, LED (Light Emitting Diode, light emitting diode) is as a kind of new type light source, owing to it has
Energy consumption is low, brightness is strong and the advantage of life-span length, has been widely used in every field.LED is typical current mode device, its
Stability requirement to operating current is the highest, if there is power frequency ripple for driving in the electric current of LED, then LED can be caused to go out
Existing stroboscopic phenomenon, and people's long-term work is under the light source of stroboscopic, can produce visual fatigue.
Existing LED drive circuit without stroboscopic is that the AC rectification of input electrical network is filtered into unidirectional current to drive LED,
Thus realize LED without stroboscopic, but because the input of existing LED drive circuit without stroboscopic is connected to bulky capacitor, cause whole electricity
The power factor on road is the lowest, so public gauze can be caused a certain degree of harmonic pollution.And in order to meet high power because of
The requirement of number, the input of existing High Power Factor LED drive circuit does not the most connect electric capacity, but so can cause its outfan
Electric current there is the biggest power frequency ripple, it is impossible to realize LED without stroboscopic.
In summary, existing High Power Factor LED drive circuit is because of the output end current bigger power frequency ripple of existence
Cause realizing LED without stroboscopic.
Utility model content
The purpose of this utility model is to provide a kind of constant current driver circuit for LED and LED light device, it is intended to solve existing
High Power Factor LED drive circuit because output end current exist bigger power frequency ripple and cause to realize LED without stroboscopic
Problem.
This utility model is achieved in that a kind of constant current driver circuit for LED, connects with LED series winding, described LED constant current
Drive circuit includes that rectification module, energy storage inductor and diode, described rectification module carry out rectification to alternating current, and export direct current
Electricity is powered by described energy storage inductor and described diode pair LED string, and described constant current driver circuit for LED also includes: permanent
Pressure control module, feedback control module and constant-current driven module；
First end of described Isobarically Control module is connected with the anode of the second end of described energy storage inductor and described diode,
First end of the sampling end of described feedback control module and described constant-current driven module is connected to the outfan of described LED string altogether,
First outfan of described feedback control module and the second outfan respectively with the input of described Isobarically Control module and described
The input of constant-current driven module connects, and the second end of described Isobarically Control module is with the second end of described constant-current driven module altogether
It is connected to ground；
Described Isobarically Control module controls the energy storage of described energy storage inductor and releases energy；Described feedback control module is to described
The output voltage of LED string is sampled, and exports first after sampled voltage and preset reference voltage are compared and processed
Controlling voltage and constant voltage, described Isobarically Control module controls the energy storage of energy storage inductor described in voltage-regulation according to described first
Time and release can the time so that the output voltage of described LED string is equal with described preset reference voltage；Meanwhile, described constant current
Drive module, according to described constant voltage, the electric current flowing through described LED string is carried out current constant control.
This utility model additionally provides a kind of LED light device, is connected with alternating current power supply, and includes LED string, described
LED light device also includes above-mentioned constant current driver circuit for LED.
This utility model provide constant current driver circuit for LED be High Power Factor without stroboscopic LED drive circuit, including constant voltage
Control module, feedback control module and constant-current driven module module, the output voltage of LED string is adopted by feedback control module
Sample, and export the first control voltage and constant voltage, constant voltage after sampled voltage and preset reference voltage are compared and processed
Control module controls voltage according to first makes the output voltage of LED string equal with preset reference voltage, constant-current driven module root
According to constant voltage, the electric current flowing through LED string carried out current constant control, thus eliminate the output of existing high-power LED driving circuit
The impact on LED string of the electric current working frequency ripple wave of end, 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 this utility model embodiment provides；
Fig. 2 is the modular structure schematic diagram of the constant current driver circuit for LED that another embodiment of this utility model provides；
Fig. 3 is the electrical block diagram of the constant current driver circuit for LED that this utility model embodiment provides；
Fig. 4 is the different cuts of SCR control switch in the constant current driver circuit for LED that this utility model embodiment provides
Input voltage, input current and the waveform diagram of output electric current corresponding to angle.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing and enforcement
Example, is further elaborated to this utility model.Should be appreciated that specific embodiment described herein is only in order to explain
This utility model, is not used to limit this utility model.
The constant current driver circuit for LED that this embodiment provides be High Power Factor without stroboscopic LED drive circuit, including constant voltage
Control module, feedback control module and constant-current driven module module, the output voltage of LED string is adopted by feedback control module
Sample, and export the first control voltage and constant voltage, constant voltage after sampled voltage and preset reference voltage are compared and processed
Control module controls voltage according to first makes the output voltage of LED string equal with preset reference voltage, constant-current driven module root
According to constant voltage, the electric current flowing through LED string carried out current constant control, thus eliminate the output of existing high-power LED driving circuit
The impact on LED string of the working frequency ripple wave of end electric current, and then eliminate the stroboscopic phenomenon of LED.
Fig. 1 shows the modular structure of the constant current driver circuit for LED that this utility model embodiment provides, for the ease of saying
Bright, illustrate only the part relevant to this utility model embodiment, 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, and exports unidirectional current by energy storage inductor L1 and two alternating current
LED string 2 is powered by pole pipe D1.Wherein, LED string 2 by multiple light emitting diodes according to the moon of a upper light emitting diode
The form of the anode that pole connects 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, in LED string 2, the negative electrode of last light emitting diode is the outfan of 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.
First end of Isobarically Control module 11 is connected with the anode of second end of energy storage inductor L1 and diode D1, feedback control
First end of the sampling end of molding block 12 and constant-current driven module 13 is connected to the outfan of LED string 2, feedback control module 12 altogether
The first outfan and the second outfan respectively with input and the input of constant-current driven module 13 of Isobarically Control module 11
Connecting, the second end of Isobarically Control module 11 and the second end of constant-current driven module 13 are 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 control module
The output voltage of 12 pairs of LED strings 2 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 11 is according to the first energy storage time controlling voltage-regulation energy storage inductor L1
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 the electric current flowing through LED string 2 is carried out current constant control.
In this utility model embodiment, the first outfan of rectification module 10 is connected with first end of energy storage inductor L1,
Second end of energy storage inductor L1 is connected with the anode of diode D1, and the negative electrode of diode D1 is connected with the input of LED string 2,
The ground connection of the second output of rectification module 10.In actual applications, rectification module 10 can be bridge rectifier.
In this utility model embodiment, when Isobarically Control module 11 turns on, the unidirectional current pair of rectification module 10 output
Energy storage inductor 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 leads to
Cross diode D1 and LED string 2 is discharged (i.e. energy storage inductor L1 releases energy or demagnetization).Output voltage when LED string 2
Time higher, the first control voltage of feedback control module 12 output is the lowest, and Isobarically Control module controls voltage according to first, makes storage
Can the energy storage time of inductance L1 reduce, so that the electric energy minimizing that energy storage inductor L1 discharge to LED string 2, LED string 2 defeated
Going out voltage to reduce, vice versa.By sampling repeatedly and the regulation repeatedly of Isobarically Control module 11 of feedback control module 12,
Make the output voltage stabilization of LED string 2 at preset reference voltage eventually.And constant-current driven module 13 is defeated according to feedback control module 12
The constant voltage output constant current gone out, so that LED string 2 flows through constant current, thus eliminates existing high-capacity LED and drives
The impact on LED string 2 of the working frequency ripple wave of circuit output end electric current, and then eliminate the stroboscopic phenomenon of LED.
As this utility model one embodiment, constant current driver circuit for LED 1 also includes SCR control switch 14, controllable silicon
Control switch 14 to be connected between the positive output end of alternating current power supply AC and the first input end of rectification module 10, rectification module 10
Second input 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 switchs the cut of 14 with SCR control
Angle is corresponding, and feedback control mould 12 tuber exports corresponding constant voltage according to the output voltage of LED string 2 and makes constant-current driven module
13 pairs of electric currents flowing through LED string 2 carry out corresponding current constant control.
In this utility model embodiment, can be controlled it to exchange by controlling the cut angle of SCR control switch 14
The cut of electricity.The cut angle of SCR control switch is the least, and it is the biggest to the cut of alternating current, each line after alternating current is rectified
The net cycle galvanic meansigma methods of output is the least so that the output voltage of LED string 2 is the least, when the output of LED string 2
When voltage is less than preset voltage value, feedback control module 12 exports the constant voltage reduction to constant-current driven module 13, so that
The electric current obtaining constant-current driven module 13 output reduces, and the electric current i.e. flowing through LED string 2 reduces, and LED string 2 is dimmed, thus can be right
LED string 2 realizes brightness regulation.
Fig. 2 shows the modular structure of the constant current driver circuit for LED 1 that another embodiment of this utility model provides, in order to just
In explanation, illustrate only the part relevant to this utility model embodiment, details are as follows:
As this utility model one embodiment, Isobarically Control module 11 includes: switch element 110, control unit 111, pass
Break signal generation unit 111 and Continuity signal generation unit 113.
Wherein, the hot end of switch element 110 connects as constant voltage control altogether with the first end of Continuity signal generation unit 113
First end of molding block 11, the second end of Continuity signal generation unit 113 connects altogether with the second end of cut-off signals generation unit 112
The first end as the second end of Isobarically Control module 11, the cold end of switch element 110 and cut-off signals generation unit 112
Connect, the outfan of cut-off signals generation unit 112 and the outfan of Continuity signal generation unit 113 respectively with control unit
The first input end of 111 and the second input connect, and the outfan of control unit 111 is connected with the control end 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 control unit 111 controls switch element 110 and turns on.Cut-off signals generation unit 112 is detecting storage
When the peak point current of energy inductance L1 reaches pre-set peak value electric current, output cut-off signals is to control unit 111, so that control unit
111 control switch element 110 turns off.
As this utility model one embodiment, feedback control module 12 includes the second reference voltage source 120, error amplifier
U5 and voltage regulation unit 121.
Wherein, in-phase input end and second reference voltage source 120 of error amplifier U5 connect, and error amplifier U5's is anti-
Phase input is the sampling end of feedback control module 12, the input of the output termination voltage regulation unit 121 of error amplifier U5, surely
First outfan of pressure unit 121 and the second outfan are respectively the first outfan and second output of feedback control module 12
End.
Fig. 3 shows the circuit structure of the constant current driver circuit for LED 1 that this utility model embodiment provides, for the ease of saying
Bright, illustrate only the part relevant to this utility model embodiment, details are as follows:
As this utility model one embodiment, switch element 112 is NMOS tube Q2, and the drain electrode of NMOS tube Q2 is switch element
The hot end of 112, the source electrode of NMOS tube Q2 is the cold end of switch element 112, and the grid of NMOS tube Q2 is switch element
The control end of 112.
As this utility model one embodiment, Continuity signal generation unit 113 include the 3rd resistance R3, the second electric capacity C2,
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 negative pole of the second electric capacity C2
First it is connected to altogether for the second end of Continuity signal generation unit 113, second end of the 3rd resistance R3 and the positive pole of the second electric capacity C2
The in-phase input end of comparator U1, inverting input and first reference voltage source 1130 of the first comparator U1 connect, the first ratio
The relatively outfan of device U1 is the outfan of Continuity signal generation unit 113.
As this utility model one embodiment, cut-off signals generation unit 112 includes the second comparator U2 and the second resistance
R2。
The input that in-phase input end is cut-off signals generation unit 112 of the second comparator U2, the second comparator U2's
First end of inverting input and the second resistance R2 meets the first end as cut-off signals generation unit 112, the second resistance R2 altogether
The second end that the second end is cut-off signals generation unit 112, the outfan of the second comparator U2 is cut-off signals generation unit
The outfan of 112.
As this utility model one embodiment, 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 is respectively first input end and second input of control unit 111
End, the input of the in-phase output end Q and phase inverter U8 of rest-set flip-flop U7 is connected, and the outfan of phase inverter U8 is control unit
The outfan of 111.
As this utility model one embodiment, voltage regulation unit 121 includes: the 3rd switching tube Q3, the 4th resistance R4, the 5th electricity
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 switch
Pipe 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 potential termination electricity of the 3rd switching tube Q3
First end of electronegative potential termination the 4th resistance R4 of source VCC, the 3rd switching tube Q3, second end of the 4th resistance R4 and the 5th resistance
First end of R5 is connected to the in-phase input end of the first operational amplifier U3 altogether, second end of the 5th resistance R5 and the 6th resistance R6's
First end connects the first outfan as voltage regulation unit 121 altogether, the second end ground connection of the 6th resistance R6, the height of the 4th switching tube Q4
The outfan controlling termination the first operational amplifier U3 of current potential termination power VCC, the 4th switching tube Q4, the first operational amplifier
The inverting input of U3 and first end of the 7th resistance R7 are connected to the cold end of the 4th switching tube Q4 altogether, the of the 7th resistance R7
First end of two ends and the 8th resistance R8 is connected to the inverting input of the second operational amplifier U4 altogether, the second operational amplifier U4's
The 3rd reference voltage source 1210 of input termination in the same direction, the outfan of the second operational amplifier U4 and second end of the 8th resistance R8 are altogether
Connect the second outfan as voltage regulation unit 121.
In this utility model embodiment, the 4th switching tube Q4 is NMOS tube, and the drain electrode of NMOS tube is the 4th switching tube Q4
Hot end, the source electrode of NMOS tube is the cold end of the 4th switching tube Q4, and the grid of NMOS tube is the 4th switching tube Q4's
Control end.
In this utility model embodiment, the 5th switching tube Q5 is NMOS tube, and the drain electrode of NMOS tube is the 5th switching tube Q5
Hot end, the source electrode of NMOS tube is the cold end of the 5th switching tube Q5, and the grid of NMOS tube is the 5th switching tube Q5's
Control end.
As this utility model one embodiment, feedback control module 12 also includes the first electric capacity C1, and the first electric capacity C1 is just
Pole connects the outfan of error amplifier U5, the minus earth of the first electric capacity C1.
As this utility model one embodiment, constant-current driven module 13 includes: the first switching tube Q1, the 3rd operational 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 control termination of the first switching tube Q1
The outfan of the 3rd operational amplifier U6, the input that in-phase input end is constant-current control module 13 of the 3rd operational amplifier U6
End, the inverting input of the 3rd operational amplifier U6 and first end of the first resistance R1 are connected to the electronegative potential of the first switching tube Q1 altogether
End, second end that the second end is constant-current driven module 13 of the first resistance R1.
In this utility model embodiment, the first switching tube Q1 is NMOS tube, and the drain electrode of NMOS tube is the first switching tube Q1
Hot end, the source electrode of NMOS tube is the cold end of the first switching tube Q1, and the grid of NMOS tube is the first switching tube Q1
Control end.
As this utility model one embodiment, constant current driver circuit for LED 1 also includes the 3rd electric capacity C3, the 3rd electric capacity C3's
Positive pole connects the negative electrode of diode D1 and the anode of LED string 2, the minus earth of the 3rd electric capacity C3.In this utility model embodiment
In, when second switch pipe Q2 turns on, LED string 2 is powered by the 3rd electric capacity C3, to ensure that LED string 2 will not extinguish.
This utility model embodiment additionally provides a kind of LED light device, is connected with alternating current power supply AC, LED light device
Including LED string 2, LED light device also includes above-mentioned constant current driver circuit for LED 1.
Below in conjunction with operation principle, this utility model embodiment is described further:
Being realized as it is shown on figure 3, LED string 2 exports Isobarically Control by the turn-on and turn-off of second switch pipe Q2, second opens
Closing pipe Q2 and be operated in critical conduction mode, when second switch pipe Q2 turns on, the unidirectional current of rectification module 10 output 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
LED string 2 is discharged (i.e. energy storage inductor L1 releases energy or demagnetization) by pipe D1.Concrete, when Continuity signal generation unit
At the end of detecting in 113 that energy storage inductor L1 releases energy (demagnetization), output Continuity signal is to control unit 111, control unit 111
Second switch pipe Q2 conducting is controlled, when cut-off signals generation unit 112 detects the peak of energy storage inductor L1 according to described Continuity signal
When value electric current reaches pre-set peak value electric current, output cut-off signals to control unit 111, control unit 111 turns off letter according to described
Number control second switch pipe Q2 turn off.More specifically, the 3rd resistance R3 and the second electric capacity C2 composition releases energy testing circuit, works as energy storage
At the end of inductance L1 releases energy, the first comparator U1 is by by the voltage of the 3rd resistance R3 the second end and the electricity of the first reference voltage source
After pressure compares, output unlatching signal is to control unit 111, and now, control unit 111 exports high level signal and opens to second
Close the control end of pipe Q2, to control second switch pipe Q2 conducting；After second switch pipe Q2 turns on, the second resistance R2 there is electric current
Passing through, when reaching pre-set peak value electric current by the electric current of the second resistance, the voltage cs of i.e. second resistance R2 the first end reaches default
During crest voltage vt_cs, the second comparator U2 output cut-off signals is to control unit 111, and now control unit 111 exports low electricity
Ordinary mail number to the control end of second switch pipe Q2, turns off controlling second switch pipe Q2.
The output voltage of LED string 2 is sampled by feedback control module 13, and by sampled voltage and preset reference voltage
(voltage of the second reference voltage source) compares, and exports the first control voltage vt_cs and constant voltage vt_out.LED
The output voltage of string 2 is the highest, and the first control voltage vt_cs of feedback control module 12 output is the lowest, and cut-off signals produces mould
The speed that block 112 produces cut-off signals is the fastest, i.e. second switch pipe Q2 turns off the soonest, so, and energy storage inductor L1 storage
Electric energy is the fewest, so that the electric energy that energy storage inductor L1 discharges to LED string 2 reduces, 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 the output voltage of LED string 2
Stable at preset reference voltage (voltage of the i.e. second reference voltage source).And constant-current driven module 13 is according to feedback control module 12
The constant voltage vt_out output constant current (the electric current Iout=vt_out/R1 of constant-current driven module 13 output) of output, with
Make LED string 2 flow through constant current, thus eliminate the working frequency ripple wave pair of existing high-power LED driving circuit output end current
The impact of LED string 2, and then eliminate the stroboscopic phenomenon of LED.
When LED string 2 being carried out brightness regulation by SCR control switch 14, switch by controlling SCR control
The cut angle of 14 controls its cut to alternating current.As shown in Figure 4, the cut angle of SCR control switch 14 is the least, and it is right
The cut of alternating current is the biggest, and after alternating current is rectified, the galvanic meansigma methods of output of each gauze cycle is the least so that LED
The output voltage of lamp string 2 is the least, when LED string 2 output voltage less than preset voltage value time, feedback control module 12 export to
The constant voltage of constant-current driven module 13 reduces, so that the electric current of constant-current driven module 13 output reduces, i.e. flows through LED
The electric current of string 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 follows input voltage
Phase place, therefore can realize High Power Factor.
In sum, the constant current driver circuit for LED 1 that this utility model embodiment provides is meeting the requirement of High Power Factor
Under, 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 be High Power Factor without stroboscopic LED drive circuit, including perseverance
Pressure control module, feedback control module and constant-current driven module module, the output voltage of LED string is carried out by feedback control module
Sampling, and export the first control voltage and constant voltage after sampled voltage and preset reference voltage are compared and processed, permanent
Voltage-controlled molding tuber controls voltage according to first makes the output voltage of LED string equal with preset reference voltage, constant-current driven module
According to constant voltage, the electric current flowing through LED string is carried out current constant control, thus it is defeated to eliminate existing high-power LED driving circuit
Go out the power frequency ripple the held impact on LED string, and then eliminate the stroboscopic phenomenon of LED.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in this utility model
Protection domain within.
Claims (10)
1. a constant current driver circuit for LED, connects with LED series winding, and described constant current driver circuit for LED includes rectification module, energy storage
Inductance and diode, described rectification module carries out rectification to alternating current, and exports unidirectional current by described energy storage inductor and described
Described in diode pair, LED string is powered, it is characterised in that described constant current driver circuit for LED also includes: Isobarically Control mould
Block, feedback control module and constant-current driven module；
First end of described Isobarically Control module is connected with the anode of the second end of described energy storage inductor and described diode, described
First end of the sampling end of feedback control module and described constant-current driven module is connected to the outfan of described LED string altogether, described
First outfan of feedback control module and the second outfan respectively with input and the described constant current of described Isobarically Control module
The input driving module connects, and the second end of described Isobarically Control module is connected to altogether with the second end of described constant-current driven module
Ground；
Described Isobarically Control module controls the energy storage of described energy storage inductor and releases energy；Described feedback control module is to described LED
The output voltage of string is sampled, and exports the first control electricity after sampled voltage and preset reference voltage are compared and processed
Pressure and constant voltage, described Isobarically Control module according to the described first energy storage time controlling energy storage inductor described in voltage-regulation and
Release the energy time, so that the output voltage of described LED string is equal with described preset reference voltage；Meanwhile, described constant-current driving mould
Tuber carries out current constant control according to described constant voltage to the electric current flowing through described LED string.
2. constant current driver circuit for LED as claimed in claim 1, it is characterised in that described constant current driver circuit for LED also includes can
Control silicon controls switch, and the positive output end that described SCR control switch is connected to alternating current power supply is defeated with the first of described rectification module
Entering between end, the second input of described rectification module is connected with the negative output terminal of described alternating current power supply；
When described LED string is carried out brightness regulation, the output voltage of described LED string and described SCR control switch
Cut angle is corresponding, and described feedback control module exports corresponding constant voltage according to the output voltage of described LED string and makes institute
State constant-current driven module and the electric current flowing through described LED string is carried out corresponding current constant control.
3. constant current driver circuit for LED as claimed in claim 1 or 2, it is characterised in that described Isobarically Control module includes: open
Close unit, control unit, cut-off signals generation unit and Continuity signal generation unit；
The hot end of described switch element connects as described Isobarically Control altogether with the first end of described Continuity signal generation unit
First end of module, the second end of described Continuity signal generation unit connects work altogether with the second end of described cut-off signals generation unit
For the second end of described Isobarically Control module, the cold end of described switch element and the first of described cut-off signals generation unit
End connect, the outfan of described cut-off signals generation unit and the outfan of described Continuity signal generation unit respectively with described control
The first input end of unit processed and the second input connect, the outfan of described control unit and the control end of described switch element
Connecting, the input of described cut-off signals generation unit is the input of described Isobarically Control module；
Described Continuity signal generation unit is at the end of detecting that described energy storage inductor releases energy, and output Continuity signal is to described control
Unit, described control unit controls described switching means conductive according to described Continuity signal；Described cut-off signals generation unit exists
Detecting when the peak point current of described energy storage inductor reaches pre-set peak value electric current, output cut-off signals is to described control unit, institute
State control unit and control the shutoff of described switch element according to described cut-off signals.
4. constant current driver circuit for LED as claimed in claim 3, it is characterised in that described Continuity signal generation unit includes the
Three 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, the negative pole of described second electric capacity is institute
State the second end of Continuity signal generation unit, the second end of described 3rd resistance and the positive pole of described second electric capacity and be connected to described altogether
The in-phase input end of the first comparator, the inverting input of described first comparator is connected with described first reference voltage source, institute
State the outfan that outfan is described Continuity signal generation unit of the first comparator.
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
Two comparators and the second resistance；
The in-phase input end of described second comparator is the input of described cut-off signals generation unit, described second comparator
First end of inverting input and described second resistance connects the first end as described cut-off signals generation unit altogether, and described second
Second end of resistance is the second end of described cut-off signals generation unit, and the outfan of described second comparator is that described shutoff is believed
The outfan of number generation unit.
6. constant current driver circuit for LED as claimed in claim 3, it is characterised in that described control unit include rest-set flip-flop and
Phase inverter；
The set end of described rest-set flip-flop and reset terminal are respectively first input end and second input of described control unit, institute
The input of the in-phase output end and described phase inverter of stating rest-set flip-flop is connected, and the outfan of described phase inverter is that described control is single
The outfan of 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 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, described error amplifier anti-phase defeated
Entering the end sampling end for described feedback control module, the output of described error amplifier terminates the input of described voltage regulation unit,
First outfan of described voltage regulation unit and the second outfan are respectively first outfan and second of described feedback control module
Outfan.
8. constant current driver circuit for LED as claimed in claim 7, it is characterised in that described voltage regulation unit includes: the 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 input that control end is described voltage regulation unit of described 3rd switching tube, the high potential termination electricity of described 3rd switching tube
Source, the electronegative potential of described 3rd switching tube terminates the first end of described 4th resistance, and the second end of described 4th resistance is with described
First end of the 5th resistance is connected to the in-phase input end of described first operational amplifier, the second end of described 5th resistance and institute altogether
State the first end of the 6th resistance and connect the first outfan as described voltage regulation unit altogether, the second end ground connection of described 6th resistance,
The high potential termination power of described 4th switching tube, the control of described 4th switching tube terminates the defeated of described first operational amplifier
Going out end, the inverting input of described first operational amplifier is connected to described 4th switching tube altogether with the first end of described 7th resistance
Cold end, the second end of described 7th resistance and the first end of described 8th resistance are connected to described second operational amplifier altogether
Inverting input, the input in the same direction of described second operational amplifier terminates described second reference voltage source, described second computing
The outfan of amplifier connects the second outfan as described voltage regulation unit altogether with the second end of described 8th resistance.
9. constant current driver circuit for LED as claimed in claim 1 or 2, it is characterised in that described constant-current driven module includes: the
One 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, the control end of described first switching tube
Connecing the outfan of described 3rd operational amplifier, the in-phase input end of described 3rd operational amplifier is described constant-current control module
Controlled end, the inverting input of described 3rd operational amplifier and the first end of described first resistance are connected to described first altogether and open
Close the cold end of pipe, second end that the second end is described constant-current driven module of described first resistance.
10. a LED light device, is connected with alternating current power supply, and includes LED string, it is characterised in that described LED illumination fills
Put the constant current driver circuit for LED also included as described in claim 1-9 any one.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620706768.5U CN205793545U (en) | 2016-07-06 | 2016-07-06 | A kind of constant current driver circuit for LED and LED light device |
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| CN201620706768.5U CN205793545U (en) | 2016-07-06 | 2016-07-06 | A kind of constant current driver circuit for LED and LED light device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105979662A (en) * | 2016-07-06 | 2016-09-28 | 深圳市明微电子股份有限公司 | LED constant current drive circuit and LED lighting device |
| CN106604473A (en) * | 2017-01-04 | 2017-04-26 | 山东中大电源科技有限公司 | LED driving power supply capable of closing through light adjusting |
| CN108055730A (en) * | 2017-12-28 | 2018-05-18 | 深圳市富满电子集团股份有限公司 | Constant-current switch power source control circuit, chip and LED drive circuit |
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2016
- 2016-07-06 CN CN201620706768.5U patent/CN205793545U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105979662A (en) * | 2016-07-06 | 2016-09-28 | 深圳市明微电子股份有限公司 | LED constant current drive circuit and LED lighting device |
| CN105979662B (en) * | 2016-07-06 | 2018-02-16 | 深圳市明微电子股份有限公司 | A kind of constant current driver circuit for LED and LED light device |
| CN106604473A (en) * | 2017-01-04 | 2017-04-26 | 山东中大电源科技有限公司 | LED driving power supply capable of closing through light adjusting |
| CN106604473B (en) * | 2017-01-04 | 2018-04-10 | 山东中大电源科技有限公司 | Can be by dimming the LED drive power turned off |
| CN108055730A (en) * | 2017-12-28 | 2018-05-18 | 深圳市富满电子集团股份有限公司 | Constant-current switch power source control circuit, chip and LED drive circuit |
| CN108055730B (en) * | 2017-12-28 | 2023-07-11 | 富满微电子集团股份有限公司 | Constant-current switching power supply control circuit, chip and LED driving circuit |
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