CN110312347A - A kind of constant current constant voltage LED drive circuit - Google Patents
A kind of constant current constant voltage LED drive circuit Download PDFInfo
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- CN110312347A CN110312347A CN201910710488.XA CN201910710488A CN110312347A CN 110312347 A CN110312347 A CN 110312347A CN 201910710488 A CN201910710488 A CN 201910710488A CN 110312347 A CN110312347 A CN 110312347A
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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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- 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]
- H05B45/30—Driver circuits
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Abstract
The present invention relates to field of LED drive technologies, in particular to a kind of constant current constant voltage LED drive circuit, by the way that EMC filter rectifier is arranged, it powers after EMC filter rectifier is by the alternating voltage filter rectification of input to pfc circuit, pfc circuit can carry out correction to power factor and provide voltage to LLC circuit, LLC circuit transfers the energy to secondary side current rectifying and wave filtering circuit by transformer isolation circuit, the electric current of input and voltage are converted into the electric current and voltage of LED needs by secondary side current rectifying and wave filtering circuit, the electric current and voltage that control circuit exports secondary side current rectifying and wave filtering circuit sample, the signal provided in conjunction with light adjusting circuit, control signal is fed back into LLC circuit by light-coupled isolation feed circuit, to realize the constant pressure of LED drive circuit, constant current and light modulation, be conducive to improve The reliability of LED driving.
Description
Technical field
The present invention relates to field of LED drive technology, in particular to a kind of constant current constant voltage LED drive circuit.
Background technique
LED driving is that input voltage is converted into voltage and current required for LED lamp bead.In order to be applicable in different number LED
Lamp is used in series, and LED drive power needs, and constant-current circuit is designed to, to adapt to the variation of different voltages；But in multiple LED
When lamp is used in parallel, constant-current circuit is still used, since electric current is mean allocation, it will cause the LED light electric currents on other roads
Become smaller, lamp is dimmed, so having constant pressure or two kinds of constant current drivings currently on the market.In practical applications, it needs according to specific feelings
Condition, purchases different classes of driving, but the not compatible use of the two.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of LED driving electricity that can be achieved at the same time constant pressure and constant current
Road.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of constant current constant voltage LED drive circuit, including primary side power-switching circuit, transformer isolation circuit, secondary side rectification
Filter circuit, light-coupled isolation feed circuit, control circuit and light adjusting circuit；
The primary side power-switching circuit is electrically connected with the transformer isolation circuit and light-coupled isolation feed circuit respectively,
The control circuit is electrically connected with the secondary side current rectifying and wave filtering circuit, light-coupled isolation feed circuit and light adjusting circuit respectively, described
Transformer isolation circuit is electrically connected with the secondary side current rectifying and wave filtering circuit；
The primary side power-switching circuit includes EMC filter rectifier, pfc circuit and LLC circuit, the pfc circuit
It is electrically connected respectively with the EMC filter rectifier and LLC circuit.
The beneficial effects of the present invention are:
By the way that EMC filter rectifier is arranged, given after EMC filter rectifier is by the alternating voltage filter rectification of input
Pfc circuit power supply, pfc circuit can carry out correction to power factor and provide voltage to LLC circuit, and LLC circuit passes through transformation
Device isolation circuit transfers the energy to secondary side current rectifying and wave filtering circuit, is turned the electric current of input and voltage by secondary side current rectifying and wave filtering circuit
Change the electric current and voltage of LED needs into, the electric current and voltage that control circuit export secondary side current rectifying and wave filtering circuit sample, knot
The signal that light adjusting circuit provides is closed, control signal is fed back into LLC circuit by light-coupled isolation feed circuit, to realize that LED drives
Constant pressure, constant current and the light modulation of dynamic circuit are conducive to the reliability for improving LED driving；The LED drive circuit of this programme design passes through
Pfc circuit and LLC circuit are set, in fully loaded output, it can be achieved that the high PF value in 94% high efficiency, 0.95 or more and low less than 10%
The driving circuit of harmonic wave.
Detailed description of the invention
Fig. 1 is a kind of circuit module schematic block diagram of constant current constant voltage LED drive circuit according to the present invention；
Fig. 2 is a kind of structural schematic diagram of the control circuit of constant current constant voltage LED drive circuit according to the present invention；
Fig. 3 is a kind of structural schematic diagram of the light adjusting circuit of constant current constant voltage LED drive circuit according to the present invention；
Fig. 4 is a kind of structural representation of the secondary side current rectifying and wave filtering circuit of constant current constant voltage LED drive circuit according to the present invention
Figure；
Fig. 5 is a kind of structural representation of the primary side power-switching circuit of constant current constant voltage LED drive circuit according to the present invention
Figure；
Label declaration:
1, primary side power-switching circuit；2, transformer isolation circuit；3, secondary side current rectifying and wave filtering circuit；4, light-coupled isolation is fed back
Circuit；5, control circuit；6, light adjusting circuit.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
Fig. 1 is please referred to, technical solution provided by the invention:
A kind of constant current constant voltage LED drive circuit, including primary side power-switching circuit, transformer isolation circuit, secondary side rectification
Filter circuit, light-coupled isolation feed circuit, control circuit and light adjusting circuit；
The primary side power-switching circuit is electrically connected with the transformer isolation circuit and light-coupled isolation feed circuit respectively,
The control circuit is electrically connected with the secondary side current rectifying and wave filtering circuit, light-coupled isolation feed circuit and light adjusting circuit respectively, described
Transformer isolation circuit is electrically connected with the secondary side current rectifying and wave filtering circuit；
The primary side power-switching circuit includes EMC filter rectifier, pfc circuit and LLC circuit, the pfc circuit
It is electrically connected respectively with the EMC filter rectifier and LLC circuit.
As can be seen from the above description, the beneficial effects of the present invention are:
By the way that EMC filter rectifier is arranged, given after EMC filter rectifier is by the alternating voltage filter rectification of input
Pfc circuit power supply, pfc circuit can carry out correction to power factor and provide voltage to LLC circuit, and LLC circuit passes through transformation
Device isolation circuit transfers the energy to secondary side current rectifying and wave filtering circuit, is turned the electric current of input and voltage by secondary side current rectifying and wave filtering circuit
Change the electric current and voltage of LED needs into, the electric current and voltage that control circuit export secondary side current rectifying and wave filtering circuit sample, knot
The signal that light adjusting circuit provides is closed, control signal is fed back into LLC circuit by light-coupled isolation feed circuit, to realize that LED drives
Constant pressure, constant current and the light modulation of dynamic circuit are conducive to the reliability for improving LED driving；The LED drive circuit of this programme design passes through
Pfc circuit and LLC circuit are set, in fully loaded output, it can be achieved that the high PF value in 94% high efficiency, 0.95 or more and low less than 10%
The driving circuit of harmonic wave.
Further, the control circuit includes resistance R30, resistance R31, resistance R32, resistance R33, resistance R34, resistance
R35, resistance R36, resistance R37, resistance R38, resistance R39, resistance R40, resistance R41, resistance R42, resistance R43, capacitor C32,
Capacitor C33, capacitor C34, capacitor C36, diode D20, diode D21, diode D22, chip U3 and chip U4；
The chip U3 include the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin,
7th pin and the 8th pin, the chip U4 include the first pin, second pin and third pin；
The first pin of the chip U3 is electrically connected with one end of one end of the resistance R33 and capacitor C32 respectively, described
The other end of resistance R33 by the diode D21 respectively with one end of the resistance R34, the cathode of diode D22 and two poles
The anode of pipe D20 is electrically connected, the other end of the resistance R34 anode with one end of the resistance R35 and diode D22 respectively
Electrical connection, another termination power of the resistance R35；
The second pin of the chip U3 is electrically connected with one end of one end of the resistance R32 and resistance R31 respectively, described
The other end of resistance R32 is electrically connected with the other end of the capacitor C32, the other end of the resistance R31 respectively with the resistance
One end of R30 and the other end electrical connection of resistance R37, another termination power of the resistance R30, the resistance R37's is another
End is electrically connected with one end of the resistance R43, the other end of the resistance R43 the first pin, the electricity with the chip U4 respectively
Hold the other end of one end of C36 and the 4th pin electrical connection of chip U3 and the resistance R43, the first pin, the electricity of chip U4
4th pin of one end and chip U3 for holding C36 is grounded, and the third pin of the chip U4 is another with the capacitor C36 respectively
One end electrical connection of one end, the second pin of chip U4, one end of resistance R39 and resistance R38, the other end of the resistance R38
Power supply is connect, the other end of the resistance R39 is electrically connected with the third pin of the chip U3；
The 5th pin of the chip U3 is electrically connected with one end of the resistance R42, another termination of the resistance R42
Ground, the 5th pin of the chip U3 and one end of resistance R42 connect power supply, the 6th pin and the resistance of the chip U3
One end of R41 is electrically connected, the other end of the resistance R41 be electrically connected with one end of the capacitor C34 and the resistance R41 it is another
One end and one end of capacitor C34 are grounded, and the other end of the capacitor C34 is electrically connected with one end of the resistance R40, the electricity
The other end of resistance R40 is electrically connected with the 7th pin of one end of the resistance R36 and chip U3 respectively, and the resistance R36's is another
One end is electrically connected with the cathode of the diode D20, and one end of the 8th pin and the capacitor C33 of the chip U3 is electrically connected
It connects, the other end ground connection of the capacitor C33, the 8th pin of the chip U3 and one end of capacitor C33 connect power supply.
Seen from the above description, base is provided for chip U3 by setting resistance R38, resistance R39, capacitor C36 and chip U4
Quasi- voltage samples output voltage by setting resistance R30, resistance R31, resistance R43 and resistance R37, by the two signal
It is compared voltage signal through primary side power-switching circuit, resistance R33, resistance R34, resistance R35 and diode D21 by light
Coupling isolation feedback circuit is transferred to LLC the regulation of electrical circuit output voltage, achievees the purpose that constant pressure.Likewise, passing through setting resistance R41
Output electric current is sampled with resistance R42, by signal compared with the dimming level of light adjusting circuit, by the way that resistance R40, electricity is arranged
Current signal is transferred to LLC the regulation of electrical circuit by light-coupled isolation feed circuit by resistance R36, resistance R34, resistance R35 and diode D20
Electric current is exported, achievees the purpose that constant current.Control circuit is by the way of two-path feedback, when electric current reaches setting value, electric current
By constant current mode operation；When electric current is not up to maximum operating currenbt, constant voltage circuit works, to reach constant pressure and constant current
Automatic conversion purpose.In addition, resistance R43, according to potentiometer, client can adjust constant pressure value, make according to actual use situation
With convenient, flexible.
Further, the light adjusting circuit includes resistance R44, resistance R45, resistance R46, resistance R47, resistance R48, resistance
R49, resistance R50, resistance R51, resistance R52, capacitor C37, capacitor C38, capacitor C39, capacitor C40, diode D23, pressure stabilizing two
Pole pipe ZD5, chip U5 and chip U6；
The chip U5 include the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin,
7th pin and the 8th pin, the chip U6 include the first pin, second pin and third pin；
The first pin of the chip U5 is electrically connected with one end of one end of the resistance R46 and resistance R47 respectively, described
The other end of resistance R47 respectively with one end of the resistance R45, two pole of one end of resistance R50, one end of resistance R52 and pressure stabilizing
The cathode of pipe ZD5 is electrically connected, the other end of the resistance R47 respectively with the second pin of the chip U5 and resistance R49 one
End electrical connection, the other end of the resistance R49 respectively with the 4th pin of the chip U5, one end of capacitor C37 and chip U6
The first pin electrical connection and the other end of the resistance R49, the 4th pin of chip U5, one end of capacitor C37 and chip U6
The first pin be grounded, the third pin of the chip U6 respectively with one end of the resistance R48, capacitor C37 the other end,
The second pin of chip U6 and one end electrical connection of resistance R44, another termination power of the resistance R44, the resistance R48's
The other end is electrically connected with the other end of the third pin of the chip U5 and resistance R45 respectively；
The 5th pin of the chip U6 is electrically connected with the other end of one end of the capacitor C40 and resistance R50 respectively, institute
The other end for stating capacitor C40 is electrically connected with one end, one end of capacitor C38 and the anode of zener diode of the capacitor C39 respectively
It connects and the other end of the capacitor C40, one end of capacitor C39, one end of capacitor C38 and the anode of zener diode is grounded,
The other end of the capacitor C38 is electrically connected with the 8th pin of the chip U6 and the other end and chip U6 of the capacitor C38
The 8th pin connect power supply, the other end of the capacitor C39 respectively with the 6th pin of the chip U5, diode D23
The electrical connection of one end of cathode and resistance R51, another termination power of the resistance R51.
Seen from the above description, rectification is played the role of by setting resistance R50, resistance R52 and capacitor C40；Setting is steady
Diode ZD5 is pressed to provide 10V voltage-stabilizing protection function；It is chip by setting resistance R44, resistance R48, capacitor C37 and chip U6
U5 provides reference voltage；Signal is amplified by setting resistance R45, resistance R46, resistance R47 and resistance R49, and is believed with input
It number is superposed to control circuit and one variable dimmer voltage is provided, to realize the adjustable of output electric current；Light adjusting circuit can be realized
Resistance, DC level and PWM three's signal it is adjustable, and a variety of lighting network controls can be compatible with simultaneously.
Further, the secondary side current rectifying and wave filtering circuit includes inductance L3, inductance L4, inductance L5, diode D17, two poles
Pipe D18, diode D22, electrolytic capacitor CE6, electrolytic capacitor CE8, electrolytic capacitor CE9, resistance R29 and transformer T3；
One end of the diode D17 is electrically connected with one end of the inductance L3, the other end difference of the diode D17
It is electrically connected with one end of one end of the diode D22, one end of electrolytic capacitor CE6 and electrolytic capacitor CE8, the inductance L3's
The other end is electrically connected with one end of the other end of the electrolytic capacitor CE6, one end of resistance R29 and inductance L4 respectively, the electricity
The other end of sense L4 is electrically connected with the other end of the diode D22, the other end and the electrolytic capacitor of the resistance R29
The other end of CE8 is electrically connected, and the transformer T3 is connected in parallel with each other with the electrolytic capacitor CE8；
One end of the inductance L5 is electrically connected with the anode of the diode D18, the cathode of the diode D18 with it is described
One end of electrolytic capacitor CE9 is electrically connected and the cathode of the diode D18 and one end of electrolytic capacitor CE9 connect power supply, described
The other end of electrolytic capacitor CE9 is electrically connected with the other end of the inductance L5 and the other end and inductance of the electrolytic capacitor CE9
The other end of L5 is grounded.
Seen from the above description, by setting inductance L3, inductance L4, diode D17, diode D22, electrolytic capacitor CE6,
Electrolytic capacitor CE8 and transformer T3, can be realized output rectification and filtering, by setting diode D18, electrolytic capacitor CE9 and
Inductance L5 can provide supply voltage for control circuit.
Further, the EMC filter rectifier includes capacitor C1, capacitor C2, capacitor C4, transformer T2, diode
D1, diode D2, diode D5, diode D6 and varistor NTC1；
One end of the capacitor C2 is electrically connected with the cathode of the anode of the diode D1 and diode D5 respectively, the electricity
The other end for holding C2 is electrically connected with the cathode of the anode of the diode D2 and diode D6 respectively, one end point of the capacitor C4
Be not electrically connected with the cathode of the cathode of the diode D1 and diode D2, the other end of the capacitor C4 respectively with two pole
The anode electrical connection of the anode and diode D6 of pipe D5, the transformer T2 are connected in parallel with each other with the capacitor C2, the change
Depressor T2 is connected in parallel with each other with the capacitor C1, and a termination varistor NTC1 of the capacitor C1, the capacitor C1's is another
One termination fuse.
Seen from the above description, abnormal protection is provided for power supply by setting fuse, setting resistance R53 can reduce drive
The dash current of dynamic circuit；By the way that capacitor C1, capacitor C2, capacitor C4, diode D1, diode D2, diode D5 and two is arranged
Pole pipe D6 can provide EMC filtering and AC rectification function for primary side power-switching circuit.
Further, the pfc circuit includes resistance R1, resistance R2, resistance R6, resistance R8, resistance R9, resistance R10, electricity
Hinder R11, resistance R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, capacitor C9, capacitor C11, capacitor C13,
Capacitor C14, electrolytic capacitor CE1, electrolytic capacitor CE3, diode D3, diode D4, diode D8, diode D10, diode
D11, field-effect tube Q1, transformer T1 and chip U1；
The chip U1 include the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin,
7th pin and the 8th pin, the first pin of the chip U1 are electrically connected with one end of the capacitor C11, the capacitor C11
The other end be electrically connected with one end of the resistance R13, the other end of the resistance R13 sun with the diode D8 respectively
Pole, one end of resistance R14, one end of resistance R18, one end of resistance R16, one end of capacitor C14, chip U1 the 5th pin,
One end ground connection of one end of electrolytic capacitor CE3 and one end electrical connection of resistance R17 and the electrolytic capacitor CE3, the chip U1
Second pin be electrically connected respectively with one end of one end of the resistance R14 and resistance R8, the third pin of the chip U1 point
Be not electrically connected with the other end of one end of the capacitor C13 and resistance R16, the 4th pin of the chip U1 respectively with the electricity
Hold one end electrical connection of the other end and resistance R10 of C14, the 6th pin of the chip U1 is electrically connected with the resistance R9, institute
The 7th pin for stating chip U1 is electrically connected with the cathode of the other end of the electrolytic capacitor CE3 and diode D11 respectively, the core
The 8th pin of piece U1 is electrically connected with one end of one end of the resistance R15 and resistance R2 respectively, the other end of the resistance R15
It is electrically connected with the other end of the resistance R17, the other end of the resistance R2 is electric with the cathode of the diode D3, electrolysis respectively
Hold one end of CE1 and the cathode electrical connection of diode D4, the anode of the diode D3 source with the field-effect tube Q1 respectively
One end of the armature winding of pole and transformer T1 is electrically connected, and the other end of the armature winding of the transformer T1 is respectively with described two
The electrical connection of the other end of the anode of pole pipe D4 and resistance R8, the other end of the secondary windings of the transformer T1 respectively with the electricity
One end of R11 and the anode electrical connection of diode D10 are hindered, the other end of the resistance R11 and one end of the capacitor C9 are electrically connected
Connect, the other end of the capacitor C9 is electrically connected with the cathode of the diode D8, the grid of the field-effect tube Q1 respectively with institute
State resistance R1 one end and resistance R9 the other end electrical connection, the other end of the resistance R1 respectively with the resistance R6 one
End, one end of secondary windings of transformer T1 and the other end of electrolytic capacitor CE1 are electrically connected, the other end of the resistance R6 and institute
State the drain electrode electrical connection of field-effect tube Q1.
Seen from the above description, in CRM critical conduction mode, the duty ratio by adjusting field-effect tube Q1 changes for transformer T1 work
Become the electric current of transformer T1, so that electric current and voltage synchronous, achieve the purpose that power is corrected；When field-effect tube Q1 conducting, give
Transformer T1 charging is compared after resistance R12 and capacitor C14 filtering with chip U1 internal signal by resistance R6, when
When electric current reaches setting value, field-effect tube Q1 shutdown.Transformer T1 is rectified by diode D3 and electrolytic capacitor CE1, by energy
It is transferred on electrolytic capacitor CE1, is used for LLC circuit.By the auxiliary winding of transformer T1, diode D10, resistance R10 and
Electric current on capacitor C14 sample detecting transformer T1, when current reduction is 0, field-effect tube Q1 can be again turned on.Resistance R2,
Resistance R15, resistance R17 and capacitor C15 constitute the voltage collection circuit of electrolytic capacitor CE1, for monitoring the both ends electrolytic capacitor CE1
Voltage.Resistance R11, capacitor C9, diode D7, diode D8 and electrolytic capacitor CE2 are rectification circuit, are provided for control chip
VCC voltage.Capacitor C11 and resistance R13 is internal error amplifier offset circuit, for setting the stability of loop.Resistance R8
With resistance R14 for detecting input voltage situation, when input voltage virtual value is lower than setting value, pfc circuit stops working, can
Under-voltage protection is done, prevents device from overheating.
Further, the LLC circuit includes field-effect tube Q2, field-effect tube Q3, resistance R3, resistance R4, resistance R5, electricity
Hinder R7, resistance R19, resistance R20, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27,
Resistance R28, capacitor C6, capacitor C13, capacitor C18, capacitor C19, capacitor 20, capacitor C24, capacitor C27, capacitor C28, electrolysis electricity
Hold CE2, electrolytic capacitor CE4, diode D12, diode D13, diode D14, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD4, chip U2, three
Pole pipe Q4 and photo resistance NTC3；
The chip U2 include the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin,
7th pin, the 8th pin, the 9th pin, the tenth pin, the 11st pin, the 12nd pin, the 13rd pin and the 14th
Pin；
The first pin of the chip U2 is electrically connected with resistance R28, the second pin of the chip U2 respectively with the electricity
Hold one end of C28 and one end electrical connection of resistance R19, the other end of the resistance R19 is electrically connected with the FPC circuit, described
The other end of capacitor C28 respectively with one end of the resistance R24, one end of capacitor C27, zener diode ZD2 anode, pressure-sensitive
One end of resistance NTC3, one end of resistance R26, the emitter of triode Q4, one end of capacitor C24, electrolytic capacitor CE4 one
One end electrical connection at end, the tenth pin of chip U2, one end of resistance R27 and capacitor C19, the third pin point of the chip U2
It is not electrically connected with the other end of the other end of the capacitor C27 and resistance R24, the 4th pin of the chip U2 and three pole
The collector of pipe Q4 is electrically connected, the 5th pin of the chip U2 respectively with the other end of the capacitor C24 and resistance R23 one
End electrical connection, the other end of the resistance R23 are electrically connected with the other end of the other end of the resistance R27 and capacitor C19 respectively,
The 6th pin of the chip U2 respectively with the cathode of the zener diode ZD2, one end of resistance R22 and resistance R25 one
End electrical connection, the other end of the resistance R25 are electrically connected with the other end of the varistor NTC3, and the resistance R22's is another
One end is electrically connected to a power source by the zener diode ZD4, and the 7th pin of the chip U2 is another with the resistance R26's
End electrical connection, the 8th pin of the chip U2 is electrically connected with the resistance R21, the 9th pin of the chip U2 respectively with institute
The anode electrical connection of the other end of electrolytic capacitor CE4, the cathode of diode D13 and diode D12 is stated, the diode D12's
Cathode is electrically connected with one end of the 14th pin of the chip U2 and capacitor C20 respectively by the resistance R20, the capacitor
The drain electrode and field-effect with the 13rd pin, one end of resistance R3, field-effect tube Q2 of the chip U2 respectively of the other end of C20
The source electrode of pipe Q3 is electrically connected, and the grid of the field-effect tube Q2 is electric with one end of the other end of the resistance R3 and resistance R4 respectively
Connection, the other end of the resistance R4 are electrically connected with the 12nd pin of the chip U2, the 11st pin of the chip U2
Be electrically connected with one end of the resistance R5, the other end of the resistance R5 respectively with one end of the resistance R7 and field-effect tube Q3
Grid electrical connection, the one end of the other end of the resistance R7 respectively with the drain electrode of the field-effect tube Q3 and capacitor C6 is electrically connected
It connects, the other end of the capacitor C6 is electrically connected with one end of the source electrode of the field-effect tube Q3 and capacitor C18 respectively, the capacitor
The other end of C18 is electrically connected with the resistance R23, the anode of diode D13 one end with the electrolytic capacitor CE2 respectively
It is electrically connected with the cathode of diode D14, the anode of the diode D14 is electrically connected with the other end of the electrolytic capacitor CE2.
Please refer to Fig. 1 to Fig. 5, the embodiment of the present invention one are as follows:
Please refer to Fig. 1, a kind of constant current constant voltage LED drive circuit, including primary side power-switching circuit 1, transformer isolation electricity
Road 2, secondary side current rectifying and wave filtering circuit 3, light-coupled isolation feed circuit 4, control circuit 5 and light adjusting circuit 6；
The primary side power-switching circuit 1 is electrically connected with the transformer isolation circuit 2 and light-coupled isolation feed circuit 4 respectively
It connects, the control circuit 5 is electrically connected with the secondary side current rectifying and wave filtering circuit 3, light-coupled isolation feed circuit 4 and light adjusting circuit 6 respectively
It connects, the transformer isolation circuit 2 is electrically connected with the secondary side current rectifying and wave filtering circuit 3；
The primary side power-switching circuit 1 includes EMC filter rectifier, pfc circuit and LLC circuit, the pfc circuit
It is electrically connected respectively with the EMC filter rectifier and LLC circuit.
Referring to figure 2., the control circuit 5 includes resistance R30 (model 1206, resistance value are 150K Ω), resistance R31
(model 0805, resistance value are 1K Ω), resistance R32 (model 0805, resistance value are 68K Ω), resistance R33 (model
0805, resistance value is 1K Ω), (model 0805, resistance value are 4.7K Ω), resistance R35 (model 0805, resistance to resistance R34
Value is 2.2K Ω), (model 0805, resistance value are 1K Ω), resistance R37 (model 0805, resistance value 4.7K to resistance R36
Ω), resistance R38 (model 0805, resistance value are 3.9K Ω), resistance R39 (model 0805, resistance value are 1K Ω), resistance
R40 (model 0805, resistance value are 3.3K Ω), resistance R41 (model 0805, resistance value are 100 Ω), resistance R42 (model
Be 0805, resistance value is 100 Ω), resistance R43 (adjustable resistance, resistance value be 0-10K Ω), capacitor C32 (model 0805, electricity
Capacitance is 100nF), capacitor C33 (model 0805, capacitance 100nF), (model 0805, capacitance are capacitor C34
220nF), capacitor C36 (model 0805, capacitance 1uF), diode D20 (model 1N4148W), diode D21 (type
Number be 1N4148W), diode D22 (for the diode of optocoupler LTV-1009), the chip U3 (operation amplifier of model LM258
Device) and chip U4 (model TL431)；
The chip U3 include the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin,
7th pin and the 8th pin, the chip U4 include the first pin, second pin and third pin；
The first pin of the chip U3 is electrically connected with one end of one end of the resistance R33 and capacitor C32 respectively, described
The other end of resistance R33 by the diode D21 respectively with one end of the resistance R34, the cathode of diode D22 and two poles
The anode of pipe D20 is electrically connected, the other end of the resistance R34 anode with one end of the resistance R35 and diode D22 respectively
Electrical connection, another termination power of the resistance R35；
The second pin of the chip U3 is electrically connected with one end of one end of the resistance R32 and resistance R31 respectively, described
The other end of resistance R32 is electrically connected with the other end of the capacitor C32, the other end of the resistance R31 respectively with the resistance
One end of R30 and the other end electrical connection of resistance R37, another termination power of the resistance R30, the resistance R37's is another
End is electrically connected with one end of the resistance R43, the other end of the resistance R43 the first pin, the electricity with the chip U4 respectively
Hold the other end of one end of C36 and the 4th pin electrical connection of chip U3 and the resistance R43, the first pin, the electricity of chip U4
4th pin of one end and chip U3 for holding C36 is grounded, and the third pin of the chip U4 is another with the capacitor C36 respectively
One end electrical connection of one end, the second pin of chip U4, one end of resistance R39 and resistance R38, the other end of the resistance R38
Power supply is connect, the other end of the resistance R39 is electrically connected with the third pin of the chip U3；
The 5th pin of the chip U3 is electrically connected with one end of the resistance R42, another termination of the resistance R42
Ground, the 5th pin of the chip U3 and one end of resistance R42 connect power supply, the 6th pin and the resistance of the chip U3
One end of R41 is electrically connected, the other end of the resistance R41 be electrically connected with one end of the capacitor C34 and the resistance R41 it is another
One end and one end of capacitor C34 are grounded, and the other end of the capacitor C34 is electrically connected with one end of the resistance R40, the electricity
The other end of resistance R40 is electrically connected with the 7th pin of one end of the resistance R36 and chip U3 respectively, and the resistance R36's is another
One end is electrically connected with the cathode of the diode D20, and one end of the 8th pin and the capacitor C33 of the chip U3 is electrically connected
It connects, the other end ground connection of the capacitor C33, the 8th pin of the chip U3 and one end of capacitor C33 connect power supply.
Referring to figure 3., the light adjusting circuit 6 includes resistance R44 (model 0805, resistance value are 3.9K Ω), resistance R45
(model 0805, resistance value are 9.53K Ω), resistance R46 (model 0805, resistance value are 510 Ω), resistance R47 (model
0805, resistance value is 10K Ω), resistance R48 (model 0805, resistance value be 510K Ω), resistance R49 (model 0805, electricity
Resistance value is 510K Ω), resistance R50 (model 0805, resistance value are 330K Ω), (model 0805, resistance value are resistance R51
9.1K Ω), resistance R52 (model 0805, resistance value be 2.2K Ω), capacitor C37 (model 0805, resistance value 100nF),
Capacitor C38 (model 0805, resistance value 100nF), capacitor C39 (model 0805, resistance value 100nF), capacitor C40
(model 0805, resistance value 100nF), diode D23 (model 1N4148W), zener diode ZD5 (model
BZT52B10V), chip U5 (operational amplifier of model LM258) and chip U6 (model TL431)；
The chip U5 include the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin,
7th pin and the 8th pin, the chip U6 include the first pin, second pin and third pin；
The first pin of the chip U5 is electrically connected with one end of one end of the resistance R46 and resistance R47 respectively, described
The other end of resistance R47 respectively with one end of the resistance R45, two pole of one end of resistance R50, one end of resistance R52 and pressure stabilizing
The cathode of pipe ZD5 is electrically connected, the other end of the resistance R47 respectively with the second pin of the chip U5 and resistance R49 one
End electrical connection, the other end of the resistance R49 respectively with the 4th pin of the chip U5, one end of capacitor C37 and chip U6
The first pin electrical connection and the other end of the resistance R49, the 4th pin of chip U5, one end of capacitor C37 and chip U6
The first pin be grounded, the third pin of the chip U6 respectively with one end of the resistance R48, capacitor C37 the other end,
The second pin of chip U6 and one end electrical connection of resistance R44, another termination power of the resistance R44, the resistance R48's
The other end is electrically connected with the other end of the third pin of the chip U5 and resistance R45 respectively；
The 5th pin of the chip U6 is electrically connected with the other end of one end of the capacitor C40 and resistance R50 respectively, institute
The other end for stating capacitor C40 is electrically connected with one end, one end of capacitor C38 and the anode of zener diode of the capacitor C39 respectively
It connects and the other end of the capacitor C40, one end of capacitor C39, one end of capacitor C38 and the anode of zener diode is grounded,
The other end of the capacitor C38 is electrically connected with the 8th pin of the chip U6 and the other end and chip U6 of the capacitor C38
The 8th pin connect power supply, the other end of the capacitor C39 respectively with the 6th pin of the chip U5, diode D23
The electrical connection of one end of cathode and resistance R51, another termination power of the resistance R51.
Referring to figure 4., the secondary side current rectifying and wave filtering circuit 3 includes inductance L3 (transformer output winding), inductance L4 (transformation
Device export winding), inductance L5 (transformer output winding), diode D17 (model SBR10U200CT), diode D18 (type
Number be MBRF20200CT-YITO-220AB), diode D22 (model MBRF20200CT-YITO-220AB), electrolytic capacitor
CE6 (specification 80V/1000uF), electrolytic capacitor CE8 (specification 80V/100uF), electrolytic capacitor CE9 (specification 50V/
47uF), resistance R29 (model 2512,0.05 Ω of resistance value) and the transformer T3 (common mode of model T10x6x5-2x100uH
Inductance)；
One end of the diode D17 is electrically connected with one end of the inductance L3, the other end difference of the diode D17
It is electrically connected with one end of one end of the diode D22, one end of electrolytic capacitor CE6 and electrolytic capacitor CE8, the inductance L3's
The other end is electrically connected with one end of the other end of the electrolytic capacitor CE6, one end of resistance R29 and inductance L4 respectively, the electricity
The other end of sense L4 is electrically connected with the other end of the diode D22, the other end and the electrolytic capacitor of the resistance R29
The other end of CE8 is electrically connected, and the transformer T3 is connected in parallel with each other with the electrolytic capacitor CE8；
One end of the inductance L5 is electrically connected with the anode of the diode D18, the cathode of the diode D18 with it is described
One end of electrolytic capacitor CE9 is electrically connected and the cathode of the diode D18 and one end of electrolytic capacitor CE9 connect power supply, described
The other end of electrolytic capacitor CE9 is electrically connected with the other end of the inductance L5 and the other end and inductance of the electrolytic capacitor CE9
The other end of L5 is grounded.
Referring to figure 5., the EMC filter rectifier includes capacitor C1 (X capacitor, specification 305Vac/100nF), electricity
Hold C2 (X capacitor, specification 305Vac/100nF), capacitor C4 (thin-film capacitor, model CL21X-450V-224P10), transformation
Device T2 (common mode inductance of model T18x10x7-2x20mH), diode D1, diode D2, diode D5, diode D6 (two
Pole pipe D1, diode D2, diode D5 and diode D6 constitute rectifier bridge, model GBU606-K) and varistor NTC1 (type
Number be SCK102R55AMSY)；
One end of the capacitor C2 is electrically connected with the cathode of the anode of the diode D1 and diode D5 respectively, the electricity
The other end for holding C2 is electrically connected with the cathode of the anode of the diode D2 and diode D6 respectively, one end point of the capacitor C4
Be not electrically connected with the cathode of the cathode of the diode D1 and diode D2, the other end of the capacitor C4 respectively with two pole
The anode electrical connection of the anode and diode D6 of pipe D5, the transformer T2 are connected in parallel with each other with the capacitor C2, the change
Depressor T2 is connected in parallel with each other with the capacitor C1, and a termination varistor NTC1 of the capacitor C1, the capacitor C1's is another
One termination fuse.
The pfc circuit includes resistance R1, resistance R2, resistance R6, resistance R8, resistance R9, resistance R10, resistance R11, electricity
Hinder R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, capacitor C9, capacitor C11, capacitor C13, capacitor C14,
Electrolytic capacitor CE1, electrolytic capacitor CE3, diode D3, diode D4, diode D8, diode D10, diode D11, field-effect
Pipe Q1, transformer T1 and chip U1；
The chip U1 include the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin,
7th pin and the 8th pin, the first pin of the chip U1 are electrically connected with one end of the capacitor C11, the capacitor C11
The other end be electrically connected with one end of the resistance R13, the other end of the resistance R13 sun with the diode D8 respectively
Pole, one end of resistance R14, one end of resistance R18, one end of resistance R16, one end of capacitor C14, chip U1 the 5th pin,
One end ground connection of one end of electrolytic capacitor CE3 and one end electrical connection of resistance R17 and the electrolytic capacitor CE3, the chip U1
Second pin be electrically connected respectively with one end of one end of the resistance R14 and resistance R8, the third pin of the chip U1 point
Be not electrically connected with the other end of one end of the capacitor C13 and resistance R16, the 4th pin of the chip U1 respectively with the electricity
Hold one end electrical connection of the other end and resistance R10 of C14, the 6th pin of the chip U1 is electrically connected with the resistance R9, institute
The 7th pin for stating chip U1 is electrically connected with the cathode of the other end of the electrolytic capacitor CE3 and diode D11 respectively, the core
The 8th pin of piece U1 is electrically connected with one end of one end of the resistance R15 and resistance R2 respectively, the other end of the resistance R15
It is electrically connected with the other end of the resistance R17, the other end of the resistance R2 is electric with the cathode of the diode D3, electrolysis respectively
Hold one end of CE1 and the cathode electrical connection of diode D4, the anode of the diode D3 source with the field-effect tube Q1 respectively
One end of the armature winding of pole and transformer T1 is electrically connected, and the other end of the armature winding of the transformer T1 is respectively with described two
The electrical connection of the other end of the anode of pole pipe D4 and resistance R8, the other end of the secondary windings of the transformer T1 respectively with the electricity
One end of R11 and the anode electrical connection of diode D10 are hindered, the other end of the resistance R11 and one end of the capacitor C9 are electrically connected
Connect, the other end of the capacitor C9 is electrically connected with the cathode of the diode D8, the grid of the field-effect tube Q1 respectively with institute
State resistance R1 one end and resistance R9 the other end electrical connection, the other end of the resistance R1 respectively with the resistance R6 one
End, one end of secondary windings of transformer T1 and the other end of electrolytic capacitor CE1 are electrically connected, the other end of the resistance R6 and institute
State the drain electrode electrical connection of field-effect tube Q1.
The LLC circuit includes field-effect tube Q2, field-effect tube Q3, resistance R3, resistance R4, resistance R5, resistance R7, resistance
R19, resistance R20, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28,
Capacitor C6, capacitor C13, capacitor C18, capacitor C19, capacitor 20, capacitor C24, capacitor C27, capacitor C28, electrolytic capacitor CE2, electricity
Solve capacitor CE4, diode D12, diode D13, diode D14, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD4, chip U2, triode Q4 and
Photo resistance NTC3；
The chip U2 include the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin,
7th pin, the 8th pin, the 9th pin, the tenth pin, the 11st pin, the 12nd pin, the 13rd pin and the 14th
Pin；
The first pin of the chip U2 is electrically connected with resistance R28, the second pin of the chip U2 respectively with the electricity
Hold one end of C28 and one end electrical connection of resistance R19, the other end of the resistance R19 is electrically connected with the FPC circuit, described
The other end of capacitor C28 respectively with one end of the resistance R24, one end of capacitor C27, zener diode ZD2 anode, pressure-sensitive
One end of resistance NTC3, one end of resistance R26, the emitter of triode Q4, one end of capacitor C24, electrolytic capacitor CE4 one
One end electrical connection at end, the tenth pin of chip U2, one end of resistance R27 and capacitor C19, the third pin point of the chip U2
It is not electrically connected with the other end of the other end of the capacitor C27 and resistance R24, the 4th pin of the chip U2 and three pole
The collector of pipe Q4 is electrically connected, the 5th pin of the chip U2 respectively with the other end of the capacitor C24 and resistance R23 one
End electrical connection, the other end of the resistance R23 are electrically connected with the other end of the other end of the resistance R27 and capacitor C19 respectively,
The 6th pin of the chip U2 respectively with the cathode of the zener diode ZD2, one end of resistance R22 and resistance R25 one
End electrical connection, the other end of the resistance R25 are electrically connected with the other end of the varistor NTC3, and the resistance R22's is another
One end is electrically connected to a power source by the zener diode ZD4, and the 7th pin of the chip U2 is another with the resistance R26's
End electrical connection, the 8th pin of the chip U2 is electrically connected with the resistance R21, the 9th pin of the chip U2 respectively with institute
The anode electrical connection of the other end of electrolytic capacitor CE4, the cathode of diode D13 and diode D12 is stated, the diode D12's
Cathode is electrically connected with one end of the 14th pin of the chip U2 and capacitor C20 respectively by the resistance R20, the capacitor
The drain electrode and field-effect with the 13rd pin, one end of resistance R3, field-effect tube Q2 of the chip U2 respectively of the other end of C20
The source electrode of pipe Q3 is electrically connected, and the grid of the field-effect tube Q2 is electric with one end of the other end of the resistance R3 and resistance R4 respectively
Connection, the other end of the resistance R4 are electrically connected with the 12nd pin of the chip U2, the 11st pin of the chip U2
Be electrically connected with one end of the resistance R5, the other end of the resistance R5 respectively with one end of the resistance R7 and field-effect tube Q3
Grid electrical connection, the one end of the other end of the resistance R7 respectively with the drain electrode of the field-effect tube Q3 and capacitor C6 is electrically connected
It connects, the other end of the capacitor C6 is electrically connected with one end of the source electrode of the field-effect tube Q3 and capacitor C18 respectively, the capacitor
The other end of C18 is electrically connected with the resistance R23, the anode of diode D13 one end with the electrolytic capacitor CE2 respectively
It is electrically connected with the cathode of diode D14, the anode of the diode D14 is electrically connected with the other end of the electrolytic capacitor CE2.
When field-effect tube Q2 conducting, field-effect tube Q3 is closed, and electric current flows into field-effect tube by the anode of electrolytic capacitor CE1
Q2, capacitor C6, cocurrent return the cathode of electrolytic capacitor CE1, and the output electric current after rectification is reduced to 0；Then field-effect tube Q2 is closed
Disconnected, the parasitic diode of field-effect tube Q3 can be connected at this time, when electric current flows through the direction diode of field-effect tube Q3, field-effect
Pipe Q3 both end voltage is 0, and field-effect tube Q3 conducting realizes that 0 voltage is open-minded, reduces switching loss, improve efficiency.Field-effect tube Q3
Shutdown, then electric current flows through field-effect tube Q2.When electric current flows through field-effect tube Q2, field-effect tube Q2 conducting realizes that 0 voltage is opened
Logical, field-effect tube is improved efficiency without switching loss.Chip U2 is field-effect tube Q2 and field-effect tube by resistance R4 and resistance R5
Q3 provides pwm switching signal, realizes the conducting and shutdown of field-effect tube.Resistance R3 and R4 are field-effect tube Q2 and field-effect tube Q3
Discharge loop is provided, the reliability of field-effect tube is provided.Diode D12, resistance R20 and capacitor C20 provide for field-effect tube Q2
Driving voltage；Capacitor C18, capacitor C19, resistance R27, resistance R23 and capacitor C24 are LLC resonator filter circuit, are mentioned for chip U2
For resonance current signal.Zener diode ZD4, resistance R22 and zener diode ZD2 are overvoltage crowbar, work as output voltage
When excessively high, VCC voltage is also increased, and causes zener diode ZD4 to be connected, when the 6th foot of chip U2 detects high-voltage signal
When, field-effect tube Q2 and field-effect tube Q3 shutdown, circuit realize overvoltage protection.When the temperature is excessively high, varistor NTC3 resistance value
Become smaller, the 6th pin of chip U2 is pulled low, and overheat protector is realized in field-effect tube Q2 and field-effect tube Q3 shutdown.Chip U2's
4th pin receives the signal of acquisition, controls the switching frequency of field-effect tube Q2 and field-effect tube Q3, when load increases, work frequency
Rate reduces, and when load reduces, working frequency increases, and realizes power adjustment.
In conclusion a kind of constant current constant voltage LED drive circuit provided by the invention, by the way that EMC filter rectifier is arranged,
After EMC filter rectifier is by the alternating voltage filter rectification of input give pfc circuit power supply, pfc circuit can to power because
Number carries out correction and provides voltage to LLC circuit, and LLC circuit transfers the energy to secondary side rectification filter by transformer isolation circuit
The electric current of input and voltage are converted into the electric current and voltage of LED needs, control circuit by secondary side current rectifying and wave filtering circuit by wave circuit
The electric current and voltage of the output of secondary side current rectifying and wave filtering circuit are sampled, in conjunction with the signal that light adjusting circuit provides, signal will be controlled
LLC circuit is fed back to by light-coupled isolation feed circuit, thus realize the constant pressure of constant current constant voltage LED drive circuit, constant current and light modulation,
Be conducive to improve the reliability of LED driving；The constant current constant voltage LED drive circuit of this programme design passes through setting pfc circuit and LLC
Circuit, in fully loaded output, it can be achieved that the high PF value in 94% high efficiency, 0.95 or more and less than the driving circuit of 10% low harmony wave.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (7)
1. a kind of constant current constant voltage LED drive circuit, which is characterized in that including primary side power-switching circuit, transformer isolation circuit,
Secondary side current rectifying and wave filtering circuit, light-coupled isolation feed circuit, control circuit and light adjusting circuit；
The primary side power-switching circuit is electrically connected with the transformer isolation circuit and light-coupled isolation feed circuit respectively, described
Control circuit is electrically connected with the secondary side current rectifying and wave filtering circuit, light-coupled isolation feed circuit and light adjusting circuit respectively, the transformation
Device isolation circuit is electrically connected with the secondary side current rectifying and wave filtering circuit；
The primary side power-switching circuit includes EMC filter rectifier, pfc circuit and LLC circuit, the pfc circuit difference
It is electrically connected with the EMC filter rectifier and LLC circuit.
2. constant current constant voltage LED drive circuit according to claim 1, which is characterized in that the control circuit includes resistance
R30, resistance R31, resistance R32, resistance R33, resistance R34, resistance R35, resistance R36, resistance R37, resistance R38, resistance R39,
Resistance R40, resistance R41, resistance R42, resistance R43, capacitor C32, capacitor C33, capacitor C34, capacitor C36, diode D20, two
Pole pipe D21, diode D22, chip U3 and chip U4；
The chip U3 includes the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin, the 7th
Pin and the 8th pin, the chip U4 include the first pin, second pin and third pin；
The first pin of the chip U3 is electrically connected with one end of one end of the resistance R33 and capacitor C32 respectively, the resistance
The other end of R33 passes through the diode D21 cathode and diode with one end of the resistance R34, diode D22 respectively
The anode of D20 is electrically connected, and the other end of the resistance R34 is electric with the anode of one end of the resistance R35 and diode D22 respectively
Connection, another termination power of the resistance R35；
The second pin of the chip U3 is electrically connected with one end of one end of the resistance R32 and resistance R31 respectively, the resistance
The other end of R32 is electrically connected with the other end of the capacitor C32, and the other end of the resistance R31 is respectively with the resistance R30's
The electrical connection of the other end of one end and resistance R37, another termination power of the resistance R30, the other end of the resistance R37 and institute
State one end electrical connection of resistance R43, the other end of the resistance R43 respectively with the first pin of the chip U4, capacitor C36
The electrical connection of the 4th pin of one end and chip U3 and the other end of the resistance R43, the first pin of chip U4, capacitor C36
The 4th pin of one end and chip U3 are grounded, the third pin of the chip U4 other end, the core with the capacitor C36 respectively
One end of the second pin of piece U4, one end of resistance R39 and resistance R38 is electrically connected, another termination power of the resistance R38,
The other end of the resistance R39 is electrically connected with the third pin of the chip U3；
The 5th pin of the chip U3 is electrically connected with one end of the resistance R42, the other end ground connection of the resistance R42, institute
One end of the 5th pin and resistance R42 of stating chip U3 connects power supply, and the 6th pin of the chip U3 is with the resistance R41's
One end electrical connection, the other end of the resistance R41 is electrically connected with one end of the capacitor C34 and the other end of the resistance R41
It is grounded with one end of capacitor C34, the other end of the capacitor C34 is electrically connected with one end of the resistance R40, the resistance
The other end of R40 is electrically connected with the 7th pin of one end of the resistance R36 and chip U3 respectively, and the resistance R36's is another
End is electrically connected with the cathode of the diode D20, and the 8th pin of the chip U3 is electrically connected with one end of the capacitor C33,
The other end of the capacitor C33 is grounded, and the 8th pin of the chip U3 and one end of capacitor C33 connect power supply.
3. constant current constant voltage LED drive circuit according to claim 1, which is characterized in that the light adjusting circuit includes resistance
R44, resistance R45, resistance R46, resistance R47, resistance R48, resistance R49, resistance R50, resistance R51, resistance R52, capacitor C37,
Capacitor C38, capacitor C39, capacitor C40, diode D23, zener diode ZD5, chip U5 and chip U6；
The chip U5 includes the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin, the 7th
Pin and the 8th pin, the chip U6 include the first pin, second pin and third pin；
The first pin of the chip U5 is electrically connected with one end of one end of the resistance R46 and resistance R47 respectively, the resistance
The other end of R47 respectively with one end of the resistance R45, one end of resistance R50, one end of resistance R52 and zener diode ZD5
Cathode electrical connection, the one end of the other end of the resistance R47 respectively with the second pin of the chip U5 and resistance R49 is electrically connected
Connect, the other end of the resistance R49 respectively with the 4th pin of the chip U5, one end of capacitor C37 and chip U6 first
Pin electrical connection and the other end of the resistance R49, the 4th pin of chip U5, one end of capacitor C37 and chip U6 first
Pin is grounded, the third pin of the chip U6 respectively with one end of the resistance R48, the other end of capacitor C37, chip U6
Second pin and resistance R44 one end electrical connection, another termination power of the resistance R44, the other end of the resistance R48
It is electrically connected respectively with the other end of the third pin of the chip U5 and resistance R45；
The 5th pin of the chip U6 is electrically connected with the other end of one end of the capacitor C40 and resistance R50 respectively, the electricity
Hold C40 the other end be electrically connected respectively with one end of the capacitor C39, one end of capacitor C38 and the anode of zener diode and
The other end of the capacitor C40, one end of capacitor C39, one end of capacitor C38 and the anode of zener diode are grounded, described
The other end of capacitor C38 be electrically connected with the 8th pin of the chip U6 and the other end of the capacitor C38 and chip U6
Eight pins connect power supply, the other end of the capacitor C39 cathode with the 6th pin of the chip U5, diode D23 respectively
It is electrically connected with one end of resistance R51, another termination power of the resistance R51.
4. constant current constant voltage LED drive circuit according to claim 1, which is characterized in that pair side current rectifying and wave filtering circuit
Including inductance L3, inductance L4, inductance L5, diode D17, diode D18, diode D22, electrolytic capacitor CE6, electrolytic capacitor
CE8, electrolytic capacitor CE9, resistance R29 and transformer T3；
One end of the diode D17 is electrically connected with one end of the inductance L3, the other end of the diode D17 respectively with institute
One end electrical connection of one end of diode D22, one end of electrolytic capacitor CE6 and electrolytic capacitor CE8 is stated, the inductance L3's is another
End is electrically connected with one end of the other end of the electrolytic capacitor CE6, one end of resistance R29 and inductance L4 respectively, the inductance L4
The other end be electrically connected with the other end of the diode D22, the other end of the resistance R29 and the electrolytic capacitor CE8's
Other end electrical connection, the transformer T3 are connected in parallel with each other with the electrolytic capacitor CE8；
One end of the inductance L5 is electrically connected with the anode of the diode D18, the cathode of the diode D18 and the electrolysis
One end of capacitor CE9 is electrically connected and the cathode of the diode D18 and one end of electrolytic capacitor CE9 connect power supply, the electrolysis
The other end of capacitor CE9 is electrically connected with the other end of the inductance L5 and the other end of the electrolytic capacitor CE9 and inductance L5
The other end is grounded.
5. constant current constant voltage LED drive circuit according to claim 1, which is characterized in that the EMC filter rectifier packet
Include capacitor C1, capacitor C2, capacitor C4, transformer T2, diode D1, diode D2, diode D5, diode D6 and varistor
NTC1；
One end of the capacitor C2 is electrically connected with the cathode of the anode of the diode D1 and diode D5 respectively, the capacitor C2
The other end be electrically connected respectively with the cathode of the anode of the diode D2 and diode D6, one end of the capacitor C4 respectively with
The electrical connection of the cathode of the cathode of the diode D1 and diode D2, the other end of the capacitor C4 respectively with the diode D5
Anode and diode D6 anode electrical connection, the transformer T2 is connected in parallel with each other with the capacitor C2, the transformer
T2 is connected in parallel with each other with the capacitor C1, a termination varistor NTC1 of the capacitor C1, the other end of the capacitor C1
Connect fuse.
6. constant current constant voltage LED drive circuit according to claim 1, which is characterized in that the pfc circuit includes resistance
R1, resistance R2, resistance R6, resistance R8, resistance R9, resistance R10, resistance R11, resistance R13, resistance R14, resistance R15, resistance
R16, resistance R17, resistance R18, capacitor C9, capacitor C11, capacitor C13, capacitor C14, electrolytic capacitor CE1, electrolytic capacitor CE3, two
Pole pipe D3, diode D4, diode D8, diode D10, diode D11, field-effect tube Q1, transformer T1 and chip U1；
The chip U1 includes the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin, the 7th
Pin and the 8th pin, the first pin of the chip U1 are electrically connected with one end of the capacitor C11, and the capacitor C11's is another
One end is electrically connected with one end of the resistance R13, the other end of resistance R13 anode, the electricity with the diode D8 respectively
Hinder one end of R14, one end of resistance R18, one end of resistance R16, one end of capacitor C14, the 5th pin of chip U1, electrolysis electricity
The one end for holding one end of CE3 and one end electrical connection of resistance R17 and the electrolytic capacitor CE3 is grounded, and the second of the chip U1
Pin is electrically connected with one end of one end of the resistance R14 and resistance R8 respectively, the third pin of the chip U1 respectively with institute
State capacitor C13 one end and resistance R16 the other end electrical connection, the 4th pin of the chip U1 respectively with the capacitor C14
The other end and resistance R10 one end electrical connection, the 6th pin of the chip U1 is electrically connected with the resistance R9, the chip
The 7th pin of U1 is electrically connected with the cathode of the other end of the electrolytic capacitor CE3 and diode D11 respectively, the chip U1's
8th pin is electrically connected with one end of one end of the resistance R15 and resistance R2 respectively, the other end of the resistance R15 with it is described
The other end of resistance R17 is electrically connected, the other end of the resistance R2 respectively with the cathode of the diode D3, electrolytic capacitor CE1
One end and diode D4 cathode electrical connection, the anode of the diode D3 respectively with the source electrode of the field-effect tube Q1 and change
One end of the armature winding of depressor T1 is electrically connected, the other end of the armature winding of the transformer T1 respectively with the diode D4
Anode and resistance R8 the other end electrical connection, the other end of the secondary windings of the transformer T1 respectively with the resistance R11
One end and diode D10 anode electrical connection, the other end of the resistance R11 is electrically connected with one end of the capacitor C9, institute
The other end for stating capacitor C9 is electrically connected with the cathode of the diode D8, the grid of the field-effect tube Q1 respectively with the resistance
The electrical connection of the other end of one end of R1 and resistance R9, the other end of the resistance R1 respectively with one end of the resistance R6, transformation
One end of the secondary windings of device T1 and the other end electrical connection of electrolytic capacitor CE1, the other end of the resistance R6 and the field are imitated
Should pipe Q1 drain electrode electrical connection.
7. constant current constant voltage LED drive circuit according to claim 1, which is characterized in that the LLC circuit includes field-effect
Pipe Q2, field-effect tube Q3, resistance R3, resistance R4, resistance R5, resistance R7, resistance R19, resistance R20, resistance R21, resistance R22,
Resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, capacitor C6, capacitor C13, capacitor C18, capacitor
C19, capacitor 20, capacitor C24, capacitor C27, capacitor C28, electrolytic capacitor CE2, electrolytic capacitor CE4, diode D12, diode
D13, diode D14, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD4, chip U2, triode Q4 and photo resistance NTC3；
The chip U2 includes the first pin, second pin, third pin, the 4th pin, the 5th pin, the 6th pin, the 7th
Pin, the 8th pin, the 9th pin, the tenth pin, the 11st pin, the 12nd pin, the 13rd pin and the 14th pin；
The first pin of the chip U2 is electrically connected with resistance R28, the second pin of the chip U2 respectively with the capacitor C28
One end and resistance R19 one end electrical connection, the other end of the resistance R19 is electrically connected with the FPC circuit, the capacitor
The other end of C28 respectively with one end of the resistance R24, one end of capacitor C27, the anode of zener diode ZD2, varistor
One end of NTC3, one end of resistance R26, the emitter of triode Q4, one end of capacitor C24, one end of electrolytic capacitor CE4, core
One end of the tenth pin of piece U2, one end of resistance R27 and capacitor C19 is electrically connected, the third pin of the chip U2 respectively with
The other end electrical connection of the other end and resistance R24 of the capacitor C27, the 4th pin and the triode Q4 of the chip U2
Collector electrical connection, the 5th pin of the chip U2 respectively with one end of the other end of the capacitor C24 and resistance R23 electricity
Connection, the other end of the resistance R23 is electrically connected with the other end of the other end of the resistance R27 and capacitor C19 respectively, described
The 6th pin of chip U2 is electric with one end of the cathode of the zener diode ZD2, one end of resistance R22 and resistance R25 respectively
Connection, the other end of the resistance R25 are electrically connected with the other end of the varistor NTC3, the other end of the resistance R22
It is electrically connected to a power source by the zener diode ZD4, the 7th pin of the chip U2 and the other end electricity of the resistance R26
Connection, the 8th pin of the chip U2 is electrically connected with the resistance R21, the 9th pin of the chip U2 respectively with the electricity
Solve the anode electrical connection of the other end of capacitor CE4, the cathode of diode D13 and diode D12, the cathode of the diode D12
It is electrically connected respectively with one end of the 14th pin of the chip U2 and capacitor C20 by the resistance R20, the capacitor C20
The other end drain electrode and field-effect tube with the 13rd pin, one end of resistance R3, field-effect tube Q2 of the chip U2 respectively
The source electrode of Q3 is electrically connected, and the one end of the grid of the field-effect tube Q2 respectively with the other end of the resistance R3 and resistance R4 is electrically connected
Connect, the other end of the resistance R4 is electrically connected with the 12nd pin of the chip U2, the 11st pin of the chip U2 with
One end of the resistance R5 is electrically connected, the other end of the resistance R5 respectively with one end of the resistance R7 and field-effect tube Q3
Grid electrical connection, the other end of the resistance R7 are electrically connected with one end of the drain electrode of the field-effect tube Q3 and capacitor C6 respectively,
The other end of the capacitor C6 is electrically connected with one end of the source electrode of the field-effect tube Q3 and capacitor C18 respectively, the capacitor C18
The other end be electrically connected with the resistance R23, the anode of the diode D13 respectively with one end of the electrolytic capacitor CE2 and
The cathode of diode D14 is electrically connected, and the anode of the diode D14 is electrically connected with the other end of the electrolytic capacitor CE2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910710488.XA CN110312347A (en) | 2019-08-02 | 2019-08-02 | A kind of constant current constant voltage LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910710488.XA CN110312347A (en) | 2019-08-02 | 2019-08-02 | A kind of constant current constant voltage LED drive circuit |
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| CN110312347A true CN110312347A (en) | 2019-10-08 |
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| CN201910710488.XA Pending CN110312347A (en) | 2019-08-02 | 2019-08-02 | A kind of constant current constant voltage LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039759A (en) * | 2020-08-11 | 2020-12-04 | 福建雪人股份有限公司 | Gateway circuit |
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| CN112039759A (en) * | 2020-08-11 | 2020-12-04 | 福建雪人股份有限公司 | Gateway circuit |
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