CN108040400A - LED drive circuit and LED lamp - Google Patents
LED drive circuit and LED lamp Download PDFInfo
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- CN108040400A CN108040400A CN201810032445.6A CN201810032445A CN108040400A CN 108040400 A CN108040400 A CN 108040400A CN 201810032445 A CN201810032445 A CN 201810032445A CN 108040400 A CN108040400 A CN 108040400A
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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]
- H05B45/40—Details of LED load circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of LED drive circuit and LED lamp, wherein, LED drive circuit includes：Rectification filtering module, for being pulsating dc voltage by the ac voltage rectifier of input；Power factor correction module, is connected to rectification filtering module, and power factor correction module is used to improve driving power factor；Linear constant current module, is connected to power factor correction module, for limiting the peak value of driving current；First electrolytic capacitor, one end of the first electrolytic capacitor are arranged between power factor correction module and linear constant current module, the other end of the first electrolytic capacitor ground connection, in peak voltage to LED load module for power supply.By technical scheme, LED load light bulb can be on the premise of guarantee power factor be more than 0.9, within reduction stroboscopic index to 20%, so as to achieve the purpose that protect eyes.
Description
Technical field
The present invention relates to drive circuit field, in particular to a kind of LED drive circuit and a kind of LED lamp.
Background technology
LED has the advantages that energy-saving and environmental protection, long lifespan, is widely used in industry, agriculture as a kind of New Solid light source
The fields such as industry, commercial lighting.At present it is generally believed that the ideal operation mode of LED is driven using constant-current supply, if normal
LED is lighted, it is necessary to a power supply changeover device, to realize the function of rectification and decompression/constant current, the LED driving electricity in correlation technique
There are following defect on road：
(1) for power factor below 0.5, harmonic wave is more than 25%, pollutes power grid, when input voltage reduces, lamps and lanterns cannot be normal
Work, does not accomplish that full voltage works normally；
(2) alternating current is fluctuated according to certain frequency cycle, due to the presence of LED itself cut-in voltages, only
When instantaneous voltage exceedes cut-in voltage, LED can just be turned on and shone, conversely, LED be off it is non-luminous.The prior art
This circuit make it that the luminous efficiency of LED is very low, stroboscopic index 100%, and the bright eyes to people sent, which produce, to stimulate and hinder
Evil.
The content of the invention
It is contemplated that at least solve one of technical problem present in the prior art or correlation technique.
For this reason, an object of the present invention is to provide a kind of LED drive circuit.
For this reason, it is another object of the present invention to propose a kind of LED lamp.
To achieve the above object, the embodiment of the first aspect of the present invention provides a kind of LED drive circuit, including：It is whole
Filter module is flowed, for being pulsating dc voltage by the ac voltage rectifier of input；Power factor correction module, is connected to
Rectification filtering module, power factor correction module are used to improve driving power factor；Linear constant current module, is connected to power
Factor correcting module, for limiting the peak value of driving current；First electrolytic capacitor, one end of the first electrolytic capacitor are arranged at power
Between factor correcting module and linear constant current module, the other end of the first electrolytic capacitor ground connection, in peak voltage to LED
Power load modules.
In the technical scheme, the electrolysis of setting first electricity between power factor correction module and linear constant current module is being set
Hold, on the one hand, by setting power factor correction module to improve the power factor of drive circuit, on the other hand, by linear
Constant flow module limits the maximum current that LED load is flowed through in drive circuit, to prevent LED load from overcurrent occur, so as to be lifted
The stability that LED load is shown, another further aspect, by setting the first electrolytic capacitor, when driving voltage is in trough state,
Discharge LED load, to maintain the continuous illumination of LED load.
The LED drive circuit proposed according to the technical program, can meet in low pressure 85V, the input voltage of high pressure 277V
The use demand of lower LED stabilized illuminations.
For stroboscopic problem, it has its source in ripple voltage on LED or ripple current is excessive, by rectification filtering module
Voltage when in trough, discharged by the first electrolytic capacitor, the normal luminous of LED load maintained, according to the work(of LED load
Rate rotates suitable first electrolytic capacitor value, real to ensure to occur without larger ripple voltage or ripple current in LED load
Now without stroboscopic.
In addition, the LED drive circuit in above-described embodiment provided by the invention can also have following additional technical feature：
In the above-mentioned technical solutions, it is preferable that power coefficient correction module includes：Transformation submodule, transformation submodule
Input terminal is connected to the output terminal of rectification filtering module, becomes press operation for being performed to pulsating dc voltage；Submodule is buffered, even
It is connected to the first output terminal of transformation submodule；Correction module, is respectively connected to the first output terminal of transformation submodule, transformation submodule
Second output terminal of block and the first output terminal of buffer sublayer module, for performing PFC.
In the technical scheme, by being arranged to power coefficient correction module to include transformation submodule, buffering submodule
And correction module, the DC voltage generated after current rectifying and wave filtering circuit, performs after transformation submodule and becomes press operation,
And directly input correction module or by inputting correction module after buffering submodule, to realize the lifting of power factor.
In any of the above-described technical solution, it is preferable that transformation submodule includes：Transformer, the first input of transformer
End is connected to the output terminal of rectification filtering module, the second input end grounding of transformer, and the first output terminal of transformer is connected to
Submodule is buffered, the second output terminal of transformer is the first output terminal of transformation submodule, is connected to the one of the first parallel resistance
End, the other end of the first parallel resistance are grounded after connecting successively with the first capacitance, zener diode；The first series connection being connected in series
Resistance and the second electrolytic capacitor, the input terminal of the first series resistance are connected to the output terminal of rectification filtering module, the second electrolysis electricity
The output head grounding of appearance；First diode, the anode of the first diode are arranged between the first capacitance and zener diode, and first
The cathode of diode is arranged between the first series resistance and the second electrolytic capacitor, using the second output as transformation submodule
End.
In the technical scheme, by setting transformer, transformation is performed with the DC voltage exported to rectification filtering module
Operation, to realize the storage of energy and transmission.
Wherein, the first parallel resistance can include three resistance in parallel, and the first series resistance can include two series connection
Resistance.
In any of the above-described technical solution, it is preferable that correction module includes：Factor correcting control chip, including first
End, second end, the 3rd end, the 4th end, the 5th end and the 6th end, first end are grounded after connecting with first resistor with the second capacitance,
Second end is grounded, and is grounded after the 3rd capacitance of the 3rd end series connection, the 4th end is connected to metal-oxide-semiconductor by second resistance and 3rd resistor
Grid, the 5th end are connected to the cathode of the first diode, and six end connecting extremely buffers the first output terminal of submodule, metal-oxide-semiconductor
Drain electrode is connected to one end ground connection of the first output terminal of transformer, the source electrode of metal-oxide-semiconductor and the second parallel resistance, the second parallel resistance
The other end ground connection, be additionally provided with the 4th resistance between the other end of the second parallel resistance and the 3rd end.
In the technical scheme, by setting Power Factor Correction Control chip, to pass through Power Factor Correction Control core
Piece controls to adjust power factor, by setting metal-oxide-semiconductor to be used as switching tube, by the output voltage values of the 6th pin, controls metal-oxide-semiconductor
Conducting and cut-off, charge the first electrolytic capacitor with being realized in cut-off, by setting the 4th resistance detection to flow through three-prong
Current signal, to detect whether to occur over-current signal, and detect there is over-current signal when, pass through the control of the 6th pin and cut
Only metal-oxide-semiconductor, to realize overcurrent protection.
Wherein, the first pin (COMP) is that the second pin (GND) is ground pin, and three-prong (CS/ZCP) is used to press down
High-frequency noise processed, the 4th pin are NV pins, and the 5th pin (VCC) is used for the operating voltage for providing controller and control circuit,
6th pin is GD pins.
In any of the above-described technical solution, it is preferable that power coefficient correction module further includes：4th capacitance, the 4th capacitance
One end be connected to the first end of control chip, the other end ground connection of the 4th capacitance；Second diode, the anode of the second diode
Grid is connected to, the cathode of the second diode is arranged between second resistance and 3rd resistor；5th resistance, the one of the 5th resistance
End is connected to the anode of the second diode, and the other end of the 5th resistance is connected to source electrode.
In any of the above-described technical solution, it is preferable that buffering submodule includes：3rd diode, the 3rd diode
Anode is connected to the first output terminal of transformer, and the cathode of the 3rd diode is determined as buffering the second output terminal of submodule, and
It is connected to linear constant current module；Second series resistance, one end of the second series resistance are connected to the cathode of the 3rd diode, and second
The other end of series resistance is determined as buffering the first output terminal of submodule；6th resistance, one end of the 6th resistance are connected to
The other end of two series resistances, the other end ground connection of the 6th resistance；5th capacitance, is connected with the 6th resistor coupled in parallel.
In the technical scheme, when being used for buffering MOS official's shut-off by buffering the buffer loop in submodule, leakage inductance is released
The high voltage released, when detecting the over-current signal of metal-oxide-semiconductor, that is, to block the output signal of control chip, realize overcurrent
Protection.
In any of the above-described technical solution, it is preferable that linear constant current module includes：3rd electrolytic capacitor；3rd electrolysis electricity
One end of appearance is connected to the cathode of the 3rd diode, the other end ground connection of the 3rd electrolytic capacitor；Two current constant control cores in parallel
Piece, current constant control chip include OUT pins, GND pins and REXT pins, and REXT is grounded after connecting with divider resistance, GND pins
Ground connection；LED load, one end of LED load are connected to one end of the 3rd electrolytic capacitor, and the other end of LED load is connected to OUT pipes
Foot.
In the technical scheme, by setting the 3rd electrolytic capacitor, charging electricity of the 3rd electrolytic capacitor in charging process
Stream is at a steady state value, and two current constant control chips can be considered as two current constant control chips, two current constant control cores
The output control terminal of piece is connected with LED load, to realize the control to shine to LED load, wherein, in OUT pins and GND pins
Between there are voltage difference, when pressure difference is not higher than the constant current threshold voltage of chip, it is non-constant to flow through the electric current of chip, and electric current can be with
The increase of the pressure drop between OUT pins and GND pins and increase, when the voltage difference between OUT pins and GND pins is higher than chip
Constant current threshold voltage after, chip present constant current operation state, that is, the electric current for flowing through chip is held essentially constant, so that further
The ripple current in LED load is reduced, to improve the service life of the light efficiency of LED load and LED load.
In any of the above-described technical solution, it is preferable that rectification filtering module includes：Rectification submodule, including：First common mode
Inductance, the first input end of the first common mode inductance are connected to the zero line of AC power by fuse, the first common mode inductance
Second input terminal is connected to the zero line side of AC power；Second common mode inductance, the first input end of the second common mode inductance are connected to
To the first output terminal of the first work mould inductance, the second input terminal of the second common mode inductance is connected to the second of the first work mould inductance
Output terminal.
In the technical scheme, by setting common mode inductance, to eliminate common mode interference, rectifier bridge stack passes through fuse and city
Electrical fire line L is connected, and since fuse has certain resistance value, can absorb peak voltage, has Anti-surging effect.
Wherein, when the electric current that cartridge fuse passes through exceedes 1.25~1.5 times of rated current, the fuse of cartridge fuse will be quick
Fusing.
In any of the above-described technical solution, it is preferable that rectification submodule further includes：Differential mode capacitor, is connected in parallel as
Between the first input end of one common mode inductance and the second input terminal；Variable resistor, is connected in parallel with differential mode capacitor；Rectifier bridge stack,
The first input end of rectifier bridge stack is connected to the first output terminal of the second common mode inductance, and the second input terminal of rectifier bridge stack is connected to
Second output terminal of the second common mode inductance, the first output head grounding of rectifier bridge stack.
In the technical scheme,, can power transformation to filter out the interference of the higher hamonic wave in power supply by setting differential mode capacitor
Hinder for negative tempperature coefficient thermistor, for the moment current-limiting protection that is powered.
In addition, rectifier bridge stack is full rectifier bridge stack, connected by 4 rectifier diodes by the form of full-wave bridge rectifier circuit
And the rectifier bridge stack being packaged as a whole, and there are two input terminals and two output terminals respectively, two input terminals pass through common mode electricity
Sense access alternating current, two output terminals are respectively direct current output cathode and earthing pole, and DC output end is connected to filtering submodule.
In any of the above-described technical solution, it is preferable that rectification filtering module includes：Submodule is filtered, including：Filtered electrical
Sense, one end of filter inductance are connected to the second output terminal of rectifier bridge stack, and the other end of inductance is determined as rectification filtering module
Output terminal；First filter capacitor, one end of the first filter capacitor are connected to one end of filter inductance, the first filter capacitor it is another
End ground connection；Second filter capacitor, one end of the second filter capacitor are connected to the other end of filter inductance, the second filter capacitor it is another
One end is grounded；7th resistance, is arranged in parallel with filter inductance.
In the technical scheme, by setting filter inductance and filter capacitor, to reduce the ripple in drive circuit.
Technique according to the invention scheme, LED load light bulb can be on the premise of guarantee power factor be more than 0.9, drop
Low frequency dodges index within 20%, so as to achieve the purpose that protect eyes.
The embodiment of the second aspect of the present invention provides a kind of LED lamp, includes the implementation of the first aspect of the present invention
LED drive circuit any one of example.
The additional aspect and advantage of the present invention will become obvious in following description section, or the practice by the present invention
Recognize.
Brief description of the drawings
Fig. 1 shows the structure diagram of LED drive circuit according to an embodiment of the invention；
Fig. 2 shows the structure diagram of LED drive circuit according to another embodiment of the invention.
Embodiment
It is to better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the case where there is no conflict, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented using other different from other modes described here, therefore, protection scope of the present invention is not limited to following public affairs
The limitation for the specific embodiment opened.
As shown in Figure 1, LED drive circuit according to an embodiment of the invention, including：AC power, AC power
For providing alternating voltage；Rectification filtering module 10, for being pulsating dc voltage by the ac voltage rectifier of input；Power because
Number correction module 20, is connected to rectification filtering module 10, and power factor correction module 20 is used to improve driving power factor；
Linear constant current module 30, is connected to power factor correction module 20, for limiting the peak value of driving current；First electrolysis electricity
Hold 40, one end of the first electrolytic capacitor 40 is arranged between power factor correction module 20 and linear constant current module 30, the first electricity
Solve capacitance 40 the other end ground connection, in peak voltage to LED load module for power supply.
In the technical scheme, the electricity of setting first between power factor correction module 20 and linear constant current module 30 is being set
Solve capacitance 40, on the one hand, by setting power factor correction module 20 to improve the power factor of drive circuit, on the other hand,
The maximum current that LED load is flowed through in drive circuit is limited by linear constant current module 30, to prevent LED load from occurring
Stream, so that the stability that LED load is shown is improved, another further aspect, by setting the first electrolytic capacitor 40, at driving voltage
When trough state, discharge LED load, to maintain the continuous illumination of LED load.
The LED drive circuit proposed according to the technical program, can meet in low pressure 85V, the input voltage of high pressure 277V
The use demand of lower LED stabilized illuminations.
For stroboscopic problem, it has its source in ripple voltage on LED or ripple current is excessive, by rectification filtering module
10 voltage is discharged by the first electrolytic capacitor 40 when in trough, the normal luminous of LED load is maintained, according to LED load
Power rotate suitable first electrolytic capacitor 40 and be worth, to ensure to occur without larger ripple voltage or line in LED load 312
Ripple electric current, realizes no stroboscopic.
In addition, the LED drive circuit in above-described embodiment provided by the invention can also have following additional technical feature：
In the above-mentioned technical solutions, it is preferable that power coefficient correction module includes：Transformation submodule, transformation submodule
Input terminal is connected to the output terminal of rectification filtering module 10, becomes press operation for being performed to pulsating dc voltage；Buffer submodule,
It is connected to the first output terminal of transformation submodule；Correction module, is respectively connected to the first output terminal of transformation submodule, transformation
Second output terminal of module and the first output terminal of buffer sublayer module, for performing PFC.
In the technical scheme, by being arranged to power coefficient correction module to include transformation submodule, buffering submodule
And correction module, the DC voltage generated after current rectifying and wave filtering circuit, performs after transformation submodule and becomes press operation,
And directly input correction module or by inputting correction module after buffering submodule, to realize the lifting of power factor.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that transformation submodule includes：Transformer 202, transformation
The first input end of device 202 is connected to the output terminal of rectification filtering module 10, the second input end grounding of transformer 202, transformation
First output terminal of device 202 is connected to buffering submodule, and the second output terminal of transformer 202 exports for the first of transformation submodule
End, is connected to one end of the first parallel resistance 204, the other end of the first parallel resistance 204 successively with the first capacitance 206, voltage stabilizing
Diode 208 is grounded after connecting；The first series resistance 210 being connected in series and the second electrolytic capacitor 212, the first series resistance
210 input terminal is connected to the output terminal of rectification filtering module 10, the output head grounding of the second electrolytic capacitor 212；One or two pole
Pipe 214, the anode of the first diode 214 are arranged between the first capacitance 206 and zener diode 208, the first diode 214
Cathode is arranged between the first series resistance 210 and the second electrolytic capacitor 212, using the second output terminal as transformation submodule.
In the technical scheme, by setting transformer 202, performed with the DC voltage exported to rectification filtering module 10
Become press operation, to realize the storage of energy and transmission.
Wherein, the first parallel resistance 204 can include three resistance in parallel, and the first series resistance 210 can include two
The resistance of a series connection.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that correction module includes：Power Factor Correction Control
Chip 216, including first end, second end, the 3rd end, the 4th end, the 5th end and the 6th end, first end and first resistor 218 with
It is grounded, second end ground connection, is grounded after the 3rd capacitance 222 of the 3rd end series connection, the 4th end passes through the second electricity after the series connection of second capacitance 220
Resistance 224 is connected to the grid of metal-oxide-semiconductor 228 with 3rd resistor 226, and the 5th end is connected to the cathode of the first diode 214, the 6th end
The first output terminal of buffering submodule is connected to, the drain electrode of metal-oxide-semiconductor 228 is connected to the first output terminal of transformer 202, metal-oxide-semiconductor
One end of 228 source electrode and the second parallel resistance 230 is grounded, the other end ground connection of the second parallel resistance 230, the second parallel resistance
The 4th resistance 232 is additionally provided between 230 other end and the 3rd end.
In the technical scheme, by setting Power Factor Correction Control chip 216, to pass through Power Factor Correction Control
Chip 216 controls to adjust power factor, by setting metal-oxide-semiconductor 228 to be used as switching tube, by the output voltage values of the 6th pin,
The conducting of metal-oxide-semiconductor 228 and cut-off are controlled, is charged with being realized in cut-off to the first electrolytic capacitor 40, by setting the 4th resistance 232
Detection flows through the current signal of three-prong, to detect whether to occur over-current signal, and detect there is over-current signal when, lead to
The 6th pin control cut-off metal-oxide-semiconductor 228 is crossed, to realize overcurrent protection.
Wherein, the first pin (COMP) is that the second pin (GND) is ground pin, and three-prong (CS/ZCP) is used to press down
High-frequency noise processed, the 4th pin are NV pins, and the 5th pin (VCC) is used for the operating voltage for providing controller and control circuit,
6th pin is GD pins.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that power coefficient correction module further includes：4th capacitance
234, one end of the 4th capacitance 234 is connected to the first end of control chip, the other end ground connection of the 4th capacitance 234；Two or two pole
Pipe 236, the anode of the second diode 236 are connected to grid, and the cathode of the second diode 236 is arranged at second resistance 224 and
Between three resistance 226；5th resistance 238, one end of the 5th resistance 238 are connected to the anode of the second diode 236, the 5th resistance
238 other end is connected to source electrode.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that buffering submodule includes：3rd diode 240,
The anode of 3rd diode 240 is connected to the first output terminal of transformer 202, and the cathode of the 3rd diode 240 is determined as buffering
Second output terminal of submodule, and it is connected to linear constant current module 30；Second series resistance 242, the one of the second series resistance 242
End is connected to the cathode of the 3rd diode 240, and the other end of the second series resistance 242 is determined as buffering the first output of submodule
End；6th resistance 244, one end of the 6th resistance 244 are connected to the other end of the second series resistance 242, the 6th resistance 244 it is another
One end is grounded；5th capacitance 246, is connected in parallel with the 6th resistance 244.
In the technical scheme, when being used for buffering MOS official's shut-off by buffering the buffer loop in submodule, leakage inductance is released
The high voltage released, when detecting the over-current signal of metal-oxide-semiconductor 228, that is, to block the output signal of control chip, realize
Stream protection.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that linear constant current module 30 includes：3rd electrolytic capacitor
302；One end of 3rd electrolytic capacitor 302 is connected to the cathode of the 3rd diode 240, another termination of the 3rd electrolytic capacitor 302
Ground；Two current constant control chips (304 and 306) in parallel, current constant control chip include OUT pins, GND pins and REXT pipes
Foot, REXT are grounded after connecting with divider resistance (308 and 310), GND pins ground connection；LED load 312, one end of LED load 312
One end of the 3rd electrolytic capacitor 302 is connected to, the other end of LED load 312 is connected to OUT pins.
In the technical scheme, by setting the 3rd electrolytic capacitor 302, the 3rd electrolytic capacitor 302 is in charging process
Charging current is at a steady state value, and two current constant control chips can be considered as two current constant control chips, two constant currents
The output control terminal of control chip is connected with LED load 312, to realize the control to shine to LED load 312, wherein, in OUT
There are voltage difference between pin and GND pins, when pressure difference is not higher than the constant current threshold voltage of chip, the electric current of chip is flowed through not
Constant, electric current can increase as the pressure drop between OUT pins and GND pins increases, when between OUT pins and GND pins
After voltage difference is higher than the constant current threshold voltage of chip, constant current operation state is presented in chip, that is, the electric current for flowing through chip is kept substantially
It is constant, so that the ripple current in LED load 312 is further reduced, to improve the light efficiency of LED load 312 and LED load 312
Service life.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that rectification filtering module 10 includes：Rectification submodule,
Including：First common mode inductance 102, the first input end of the first common mode inductance 102 are connected to AC power by fuse 104
Zero line, the second input terminal of the first common mode inductance 102 are connected to the zero line side of AC power；Second common mode inductance 106, second
The first input end of common mode inductance 106 is connected to the first output terminal of the first work mould inductance, and the second of the second common mode inductance 106
Input terminal is connected to the second output terminal of the first work mould inductance.
In the technical scheme, by setting common mode inductance, to eliminate common mode interference, rectifier bridge stack 112 passes through fuse
104 are connected with alternating current firewire L, since fuse 104 has certain resistance value, can absorb peak voltage, and there is Anti-surging to make
With.
Wherein, when the electric current that cartridge fuse passes through exceedes 1.25~1.5 times of rated current, the fuse of cartridge fuse will be quick
Fusing.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that rectification submodule further includes：Differential mode capacitor 108, and
Connection connection is as between the first input end and the second input terminal of the first common mode inductance 102；Variable resistor 110, with differential mode capacitor
108 are connected in parallel；It is first defeated to be connected to the second common mode inductance 106 for rectifier bridge stack 112, the first input end of rectifier bridge stack 112
Outlet, the second input terminal of rectifier bridge stack 112 are connected to the second output terminal of the second common mode inductance 106, and the of rectifier bridge stack 112
One output head grounding.
In the technical scheme,, can to filter out the interference of the higher hamonic wave in power supply by setting differential mode capacitor 108
Become resistance 110 as negative tempperature coefficient thermistor, for the moment current-limiting protection that is powered.
In addition, rectifier bridge stack 112 is full rectifier bridge stack 112, the shape of full-wave bridge rectifier circuit is pressed by 4 rectifier diodes
The rectifier bridge stack 112 that formula is connected and is packaged as a whole, and there are two input terminals and two output terminals respectively, two input terminals lead to
Common mode inductance access alternating current is crossed, two output terminals are respectively direct current output cathode and earthing pole, and DC output end is connected to filtering
Submodule.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that rectification filtering module 10 includes：Filter submodule,
Including：Filter inductance 114, one end of filter inductance 114 are connected to the second output terminal of rectifier bridge stack 112, the other end of inductance
It is determined as the output terminal of rectification filtering module 10；First filter capacitor 116, one end of the first filter capacitor 116 are connected to filtering
One end of inductance 114, the other end ground connection of the first filter capacitor 116；Second filter capacitor 118, the one of the second filter capacitor 118
End is connected to the other end of filter inductance 114, the other end ground connection of the second filter capacitor 118；7th resistance 120, with filtered electrical
Sense 114 is arranged in parallel.
In the technical scheme, by setting filter inductance 114 and filter capacitor, to reduce the ripple in drive circuit
Line.
Technical scheme is described in detail above in association with attached drawing, the present invention provides a kind of LED drive circuit,
Set and the first electrolytic capacitor be set between power factor correction module and linear constant current module, on the one hand, by set power because
Number correction module improves the power factor of drive circuit, on the other hand, is limited by linear constant current module in drive circuit
The maximum current of LED load is flowed through, to prevent LED load from overcurrent occur, so that the stability that LED load is shown is improved, then
On the one hand, by setting the first electrolytic capacitor, when driving voltage is in trough state, discharge LED load, to maintain LED
The continuous illumination of load.
According to the LED lamp of the embodiment of invention, including the LED drive circuit described in above-mentioned any embodiment.
In the present invention, term " first ", " second ", " the 3rd " are only used for the purpose described, and it is not intended that instruction
Or imply relative importance；Term " multiple " then refers to two or more, unless otherwise restricted clearly.Term " installation ",
The term such as " connected ", " connection ", " fixation " should all be interpreted broadly, for example, " connection " can be fixedly connected or can
Dismantling connection, or be integrally connected；" connected " can be directly connected, and can also be indirectly connected by intermediary.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In description of the invention, it is to be understood that the instruction such as term " on ", " under ", "left", "right", "front", "rear"
Orientation or position relationship are based on orientation shown in the drawings or position relationship, are for only for ease of the description present invention and simplification is retouched
State, rather than instruction or imply signified device or unit there must be specific direction, with specific azimuth configuration and operation,
It is thus impossible to it is interpreted as limitation of the present invention.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean to combine at least one reality that the particular features, structures, materials, or characteristics that the embodiment or example describe are contained in the present invention
Apply in example or example.In the present specification, schematic expression of the above terms is not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more embodiments or example with
Suitable mode combines.
It these are only the preferred embodiment of the present invention, be not intended to limit the invention, for those skilled in the art
For member, the invention may be variously modified and varied.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (11)
- A kind of 1. LED drive circuit, it is characterised in that including：Rectification filtering module, for being pulsating dc voltage by the ac voltage rectifier of input；Power factor correction module, is connected to the rectification filtering module, and the power factor correction module is used to improve Driving power factor；Linear constant current module, is connected to the power factor correction module, for limiting the peak value of driving current；First electrolytic capacitor, one end of first electrolytic capacitor are arranged at the power factor correction module and the linear perseverance Between flow module, the other end of first electrolytic capacitor ground connection, in peak voltage to LED load module for power supply.
- 2. LED drive circuit according to claim 1, it is characterised in that the power coefficient correction module includes：Transformation submodule, the input terminal of the transformation submodule is connected to the output terminal of the rectification filtering module, for institute State pulsating dc voltage and perform and become press operation；Submodule is buffered, is connected to the first output terminal of the transformation submodule；Correction module, is respectively connected to first output terminal of transformation submodule, the second output terminal of the transformation submodule With it is described buffering submodule the first output terminal, for performing PFC.
- 3. LED drive circuit according to claim 2, it is characterised in that the transformation submodule includes：Transformer, the first input end of the transformer are connected to the output terminal of the rectification filtering module, the transformer Second input end grounding, the first output terminal of the transformer is the first output terminal of the transformation submodule, to be connected to Buffering submodule is stated, the second output terminal of the transformer is connected to one end of the first parallel resistance, first parallel resistance The other end connect successively with the first capacitance, zener diode after be grounded；The first series resistance for being connected in series and the second electrolytic capacitor, the input terminal of first series resistance are connected to described whole Flow the output terminal of filter module, the output head grounding of second electrolytic capacitor；First diode, the anode of first diode are arranged between first capacitance and the zener diode, institute The cathode for stating the first diode is arranged between first series resistance and second electrolytic capacitor, to be used as the transformation Second output terminal of submodule.
- 4. LED drive circuit according to claim 3, it is characterised in that the correction module includes：Factor correcting control chip, including first end, second end, the 3rd end, the 4th end, the 5th end and the 6th end, described first End is grounded after connecting with first resistor with the second capacitance, the second end ground connection, is grounded after the 3rd capacitance of the 3rd end series connection, 4th end is connected to the grid of metal-oxide-semiconductor by second resistance and 3rd resistor, and the 5th end is connected to the described 1st The cathode of pole pipe, the first output terminal of the six end connecting to the buffering submodule, the drain electrode of the metal-oxide-semiconductor are connected to institute State one end ground connection of the first output terminal of transformer, the source electrode of the metal-oxide-semiconductor and the second parallel resistance, second parallel resistance The other end ground connection, be additionally provided with the 4th resistance between the other end of second parallel resistance and the 3rd end.
- 5. LED drive circuit according to claim 4, it is characterised in that the power coefficient correction module further includes：4th capacitance, one end of the 4th capacitance are connected to the first end of the control chip, the 4th capacitance it is another End ground connection；Second diode, the anode of second diode are connected to the grid, and the cathode of second diode is arranged at Between the second resistance and the 3rd resistor；5th resistance, one end of the 5th resistance are connected to the anode of second diode, the 5th resistance it is another End is connected to the source electrode.
- 6. LED drive circuit according to claim 5, it is characterised in that the buffering submodule includes：3rd diode, the anode of the 3rd diode are connected to the first output terminal of the transformer, the three or two pole The cathode of pipe is determined as the second output terminal of the buffering submodule, and is connected to the linear constant current module；Second series resistance, one end of second series resistance are connected to the cathode of the 3rd diode, second string The other end of connection resistance is determined as the first output terminal of the buffering submodule；6th resistance, one end of the 6th resistance are connected to the other end of second series resistance, the 6th resistance The other end is grounded；5th capacitance, is connected with the 6th resistor coupled in parallel.
- 7. LED drive circuit according to claim 1, it is characterised in that the linear constant current module includes：3rd electrolytic capacitor；One end of 3rd electrolytic capacitor is connected to the cathode of the 3rd diode, the 3rd electricity Solve the other end ground connection of capacitance；Two current constant control chips in parallel, the current constant control chip includes OUT pins, GND pins and REXT pins, described REXT is grounded after connecting with divider resistance, the GND pins ground connection；LED load, one end of the LED load are connected to one end of the 3rd electrolytic capacitor, the LED load it is another One end is connected to the OUT pins.
- 8. LED drive circuit according to any one of claim 1 to 7, it is characterised in that the rectification filtering module bag Include：Rectification submodule, including：First common mode inductance, the first input end of first common mode inductance are connected to the fire of the AC power by fuse Line end, the second input terminal of first common mode inductance are connected to the zero line side of the AC power；Second common mode inductance, the first input end of second common mode inductance are connected to first defeated to the first work mould inductance Outlet, the second input terminal of second common mode inductance are connected to the second output terminal of the first work mould inductance.
- 9. LED drive circuit according to claim 8, it is characterised in that the rectification submodule further includes：Differential mode capacitor, is connected in parallel between first input end and the second input terminal as first common mode inductance；Variable resistor, is connected in parallel with the differential mode capacitor；Rectifier bridge stack, the first input end of the rectifier bridge stack is connected to the first output terminal of second common mode inductance, described Second input terminal of rectifier bridge stack is connected to the second output terminal of second common mode inductance, the first output of the rectifier bridge stack End ground connection.
- 10. LED drive circuit according to claim 9, it is characterised in that the rectification filtering module includes：Submodule is filtered, including：Filter inductance, one end of the filter inductance are connected to the second output terminal of the rectifier bridge stack, the inductance it is another End is determined as the output terminal of the rectification filtering module；First filter capacitor, one end of first filter capacitor are connected to one end of the filter inductance, first filtering The other end ground connection of capacitance；Second filter capacitor, one end of second filter capacitor are connected to the other end of the filter inductance, second filter The other end ground connection of ripple capacitance；7th resistance, is arranged in parallel with the filter inductance.
- A kind of 11. LED lamp, it is characterised in that including：LED drive circuit as any one of claims 1 to 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810032445.6A CN108040400B (en) | 2018-01-12 | 2018-01-12 | LED driving circuit and LED lamp |
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| CN201810032445.6A CN108040400B (en) | 2018-01-12 | 2018-01-12 | LED driving circuit and LED lamp |
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| CN108040400B CN108040400B (en) | 2023-07-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714865A (en) * | 2019-02-27 | 2019-05-03 | 东北林业大学 | A kind of LED drive circuit and method of no stroboscopic High Power Factor |
| CN111225474A (en) * | 2020-01-13 | 2020-06-02 | 深圳市明微电子股份有限公司 | Light source driving circuit for improving power factor, lighting system and light source driving method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527503A (en) * | 2008-03-08 | 2009-09-09 | 林福泳 | High-power factor correcting circuit |
| KR100987403B1 (en) * | 2008-12-23 | 2010-10-14 | 카멜테크 주식회사 | Power supply device for led |
| CN203181299U (en) * | 2013-03-15 | 2013-09-04 | 无锡科技职业学院 | Constant-current driving circuit structure for small-power lamps |
| CN104507198B (en) * | 2014-11-12 | 2017-11-07 | 瑞芙贝（武汉）光电科技发展有限公司 | Active clamping forward, flyback recommend integrated lamp controller |
| CN105323930B (en) * | 2015-11-13 | 2018-01-09 | 余塘 | LED dims constant-current drive circuit |
| CN208190964U (en) * | 2018-01-12 | 2018-12-04 | 江西美的贵雅照明有限公司 | LED drive circuit and LED lamp |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714865A (en) * | 2019-02-27 | 2019-05-03 | 东北林业大学 | A kind of LED drive circuit and method of no stroboscopic High Power Factor |
| CN111225474A (en) * | 2020-01-13 | 2020-06-02 | 深圳市明微电子股份有限公司 | Light source driving circuit for improving power factor, lighting system and light source driving method |
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