CN206061209U - LED drive - Google Patents
LED drive Download PDFInfo
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- CN206061209U CN206061209U CN201620854447.XU CN201620854447U CN206061209U CN 206061209 U CN206061209 U CN 206061209U CN 201620854447 U CN201620854447 U CN 201620854447U CN 206061209 U CN206061209 U CN 206061209U
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Abstract
The utility model discloses a kind of LED drive, which can include switch module, energy-storage module and processing module.Energy-storage module can be connected with switch module, direct-current input power supplying and LED light lamp and can store the energy of direct-current input power supplying input.Processing module can be connected with switch module and direct-current input power supplying, and changeable switch module, make energy-storage module export energy to LED light lamp.Wherein, processing module can receive the default working cycle to export modulating signal to switch switch module, so that LED drive is operable with determining power mode output.
Description
Technical field
This utility model is related to a kind of LED drive, particularly a kind of fixed power led driver.
Background technology
Due to the progress of science and technology, the technology of light emitting diode (LED) illuminator also more and more improves, light emitting diode
(LED) illuminator has many advantages, such as life-span length, energy-saving and environmental protection, small volume and response speed is fast etc., therefore is well suited for
Become following main flow illuminator.
However, the rated power of major part light emitting diode illuminating apparatus is although close at present, but its used specified electricity
Stream or rated voltage are but differed, and the at present conventional light emitting diodes adopted by major part light emitting diode illuminating apparatus drive
Device is to determine current driver；For example, if there is three kinds of different light emitting diode illuminating apparatus, its rated current/rated voltage point
Not Wei 80V/350mA, 56V/500mA and 40V/700mA, then need 350mA to determine current driver, 500mA and determine current driver
And 700mA determines current driver, to drive above-mentioned light emitting diode illuminating apparatus respectively.Therefore, manufacturer is needed for different
Light emitting diode illuminating apparatus design difference determines current driver, the cost of light emitting diode illuminating apparatus is significantly lifted.
Be illustrated in figure 1 the circuit diagram of conventional light emitting diodes driver, shown in figure for traditional direction flyback converter
(Flyback converter) 1, which is a kind of conventional LED drive.
As illustrated, transformator TM stores the energy of direct-current input power supplying Pin, and pulse width modulation circuit PM is then exported
Modulating signal makes transformator TM export the energy of its storage to LED light lamp LD to switch switch S, additionally, traditional flyback
Formula transducer 1 is also needed comprising feedback circuit FB, to transmit electric current feedback signal to pulse width modulation circuit PM to adjust its ripple
Width, so makes traditional direction flyback converter 1 be operable with constant current mode.
However, as traditional direction flyback converter 1 needs to arrange feedback circuit FB, therefore be a loop circuit circuit, therefore
When the phase shift of feedback signal reaches 180 °, the easily generation vibration of traditional direction flyback converter 1, therefore direction flyback converter 1
Stability is also to be hoisted.
Additionally, the parasitic capacitance (Coss) of switch S can produce resonance with the leakage inductance of transformator when S closings are switched, therefore
The stability of direction flyback converter 1 can be reduce further.
Further, since the opening time of the pulse wave of pulse width modulation circuit PM outputs is often less than 50%, and it is general micro-
The built-in pulse width modulation circuit of controller (MCU) its output pulse wave opening time be 50% when, its resolution is only capable of
Reach 56 ranks.Therefore, if user is dimmed to LED light lamp LD, it can be seen that apparent flicker situation, therefore
Be unable to reach it is real dim without section, therefore the efficiency of direction flyback converter 1 also needs to further be lifted.And other are traditional luminous
Diode (led) driver, such as lifting/voltage reducing transducer (Buck＆Booster converter), also have above-mentioned problem.
Therefore, a kind of LED drive how is proposed, existing LED drive can be effectively improved
The situation that high cost, stability is not good and efficiency is low becomes an instant problem.
Utility model content
In view of above-mentioned the problems of the prior art, a wherein purpose of the present utility model is just to provide a kind of light-emitting diodes
Pipe driver, to solve the problems, such as existing LED drive high cost, stability is not good and efficiency is low.
According to a wherein purpose of the present utility model, propose a kind of LED drive, its can comprising switch module,
Energy-storage module and processing module.Energy-storage module can be connected with switch module, direct-current input power supplying and LED light lamp and can be stored up
Deposit the energy of direct-current input power supplying input.Processing module can be connected with switch module and direct-current input power supplying, and changeable switch
Module, makes energy-storage module export energy to LED light lamp.Wherein, processing module can receive the default working cycle to export tune
Varying signal is to switch switch module, so that LED drive is operable with determining power mode output.
According to a wherein purpose of the present utility model, a kind of LED drive is proposed again, which can include switching molding
Block, energy-storage module and processing module.Energy-storage module can be connected with switch module, direct-current input power supplying and LED light lamp and can
The energy of storage direct-current input power supplying input.Processing module can be connected with switch module and direct-current input power supplying and can be received default
Modulation parameter makes the exportable energy of energy-storage module to LED light lamp, with right to export modulating signal to switch switch module
LED light lamp is dimmed.Wherein, the resolution of the open-interval maximum of the pulse wave of modulating signal can include multiple
Stage, processing module can make the modulating signal can be comprising multiple real rank sections, and respectively according to default modulation parameter adjustment modulating signal
Individual real rank section can also include virtual rank section.
From the above, the LED drive that this utility model is provided, which can have one or more following advantages：
(1), in an embodiment of the present utility model, the processing module of LED drive can be input into by preset value
Port is implanted into default working cycle and default input voltage in procedure for producing, so that the modulating signal of processing module output and straight
The input voltage of stream input power is definite value, therefore works in can LED drive and determine power mode, therefore applicable
In all light emitting diode illuminating apparatus with same nominal power, the cost of light emitting diode illuminating apparatus is made significantly to drop
It is low.
(2) in an embodiment of the present utility model, the modulating signal of the processing module of LED drive output and
The input voltage of direct-current input power supplying is definite value, therefore can ensure that LED drive works in discontinuous conduction mode
(Discontinuous Conduction Mode) with continuous firing in determining power mode, therefore LED drive tool
Splendid reliability.
(3) in an embodiment of the present utility model, the modulating signal of the processing module of LED drive output and
The input voltage of direct-current input power supplying is definite value, even if therefore the change of the load voltage of LED drive, light emitting diode
Driver still may operate in determines power mode output, using upper more elasticity.
(4), in an embodiment of the present utility model, the processing module of LED drive can be input into by preset value
Port is implanted into default modulation parameter in procedure for producing, thereby controls the maximum current of energy-storage module, therefore can ensure light-emitting diodes
Pipe driver continuous firing in discontinuous conduction mode with continuous firing in determining power mode, therefore LED drive
Cost is greatly reduced and has splendid reliability.
(4), in an embodiment of the present utility model, LED drive can pass through the waveform for adjusting modulating signal, make
Which can change with the waveform of the input voltage of direct-current input power supplying, therefore can effectively improve ripple phenomenon.
(5), in an embodiment of the present utility model, LED drive is to open loop circuit, therefore does not have loop circuit
The shortcoming of circuit, is lifted the stability of LED drive.
(6), in an embodiment of the present utility model, LED drive is operable with determining power mode, even if therefore
Multiple LED drive directly connect in series or in parallel will not also make power consumption concentrate on any one
Optical diode driver, therefore using upper more extensive.
(7), in an embodiment of the present utility model, LED drive can be comprising resonance suppression circuit, and which can be effective
Ground suppresses the leakage inductance of parasitic capacitance and the energy-storage module (becoming electrical equipment or inductance etc.) of switch to produce the phenomenon of resonance, therefore further
Improve the stability of LED drive.
(8), in an embodiment of the present utility model, the processing module of LED drive can be input into by preset value
Port is implanted into default modulation parameter in procedure for producing, make processing module output modulating signal can comprising multiple real rank sections and
Multiple virtual rank sections, therefore the lack of resolution of the pulse wave of modulating signal can be solved the problems, such as, and can reach and real adjust without section
Light.
Description of the drawings
Circuit diagrams of the Fig. 1 for conventional light emitting diodes driver；
The circuit diagram of the first embodiment of the LED drive that Fig. 2 is provided for this utility model；
The modulating signal oscillogram of the first embodiment of the LED drive that Fig. 3 is provided for this utility model；
The modulating signal oscillogram of the first embodiment of the LED drive that Fig. 4 is provided for this utility model；
The circuit diagram of the second embodiment of the LED drive that Fig. 5 is provided for this utility model；
The circuit diagram of the 3rd embodiment of the LED drive that Fig. 6 is provided for this utility model；
The circuit diagram of the fourth embodiment of the LED drive that Fig. 7 is provided for this utility model；
The schematic diagram of the fourth embodiment of the LED drive that Fig. 8 is provided for this utility model；
The circuit diagram of the 5th embodiment of the LED drive that Fig. 9 is provided for this utility model；
The input voltage waveform figure of the 5th embodiment of the LED drive that Figure 10 a are provided for this utility model；
The modulating signal oscillogram of the 5th embodiment of the LED drive that Figure 10 b are provided for this utility model；
The current waveform figure of the 5th embodiment of the LED drive that Figure 10 c are provided for this utility model；
The output oscillogram of the 5th embodiment of the LED drive that Figure 10 d are provided for this utility model.
Description of reference numerals：The programmable Gamma correction buffer circuits of 1-；2- LED drive；S- is switched；TM- becomes
Depressor；M- microcontrollers；P- preset value input ports；PM- pulse width modulation circuits；LD- LED light lamp；PWin- is straight
Stream input power；FB- feedback circuits；RRC- resonance suppression circuits；DD- presets the working cycle；DV- presets input voltage；DMS-
Default modulation parameter；Vin- input voltages；Ip- maximum currents；D1～D3- diodes；TR1- transistors；C- electric capacity；R- resistance；
ID- inductance；OP- operational amplifiers；The T- cycles；The To- opening times；N- n-ths reality rank section；The virtual rank sections of Nv1～Nv3-；
The pulsewidth in Wn- n-th stages；The pulsewidth in N+1 stage of Wn+1-.
Specific embodiment
Hereinafter with reference to correlative type, the embodiment of the LED drive that this utility model is provided is illustrated, to make
Readily appreciate, the same components in following embodiments are illustrated with identical symbology.
The circuit diagram of the first embodiment of the LED drive of this utility model offer, this reality are provided
Apply example illustrate by it is of the present utility model design be applied to wherein the one of direction flyback converter (Flyback converter)
Individual preferably example.As illustrated, LED drive 2 can include switch module, energy-storage module and processing module；At this
In embodiment, switch module can be switch S, and which can be metal oxide semiconductor field effect transistor (n-channel
MOSFET), energy-storage module can be transformator TM, and processing module can be microcontroller M；In other preferred embodiments, switch
S is alternatively bipolarity junction transistor (BJT).
The primary side of transformator TM can be connected with microcontroller M and direct-current input power supplying PWin, and can pass through diode D1
It is connected with switch S；The secondary side of transformator TM can be connected with LED light lamp LD by diode D2 and electric capacity C；Transformator
TM can store the energy of direct-current input power supplying PWin inputs.
Microcontroller M can be connected with switch S and direct-current input power supplying PWin；Microcontroller M can control direct-current input power supplying
The input voltage vin of PWin, and changeable switch S, make transformator TM export energy to LED light lamp LD；Wherein, direct current
The input voltage vin of input power PWin can be constant DC voltage or pulsating dc voltage, and pulsating dc voltage can be triangle
(direct current described in this specification is comprising perseverance for the pulsating dc voltage of ripple, full-wave-rectified sinewave or any other form
Determine direct current or pulsating direct current).In the present embodiment, microcontroller M can include preset value input port P, and microcontroller M can be by pre-
If value input port P receives preset energy with controlling switch S and/or transformator TM, so that LED drive 2 is worked in
Determine power mode output (Constant-power mode)；In the present embodiment, preset energy can for default working cycle DD and
Default input voltage DV or the two one of.Microcontroller M can export modulating signal to switch out according to default working cycle DD
S is closed, so that LED drive 2 is operable with determining power mode output (Constant-power mode)；Wherein, in advance
If the working cycle, DD may be less than or equal to 50%；Additionally, microcontroller M also can receive default input by preset value input port P
Voltage DV, and the input voltage vin of direct-current input power supplying PWin can be controlled according to default input voltage DV, drive light emitting diode
Dynamic device 2 is operable with determining power mode output.
From the foregoing, the microcontroller M of the LED drive 2 of the present embodiment can include preset value input port
P, therefore manufacturer can enter default working cycle DD and default input voltage by preset value input port P prior values in procedure for producing
DV, you can ensure in each working cycle of switch S, the energy of energy-storage module energy storage is definite value, drives light emitting diode
Dynamic device 2 is operable with determining power mode output, as long as and from appropriate energy-storage module, you can ensure switch S each
In working cycle, energy-storage module can discharge the energy of its storage completely to LED light lamp LD, make LED drive
2 are operable with discontinuous conduction mode (Discontinuous-conduction mode).Therefore, by above-mentioned design, make
LED drive 2 can keep working in determines power mode output, therefore is applicable to equal-wattage but has not
The various light emitting diode illuminating apparatus of same rated current/voltage；Therefore, manufacturer need not therefore light emitting diode illuminating apparatus
Again exclusive LED drive is designed for which with different rated current/voltages, therefore light-emitting diodes can be greatly reduced
The cost of pipe illuminator.Certainly, citing is above are only, this utility model is not limited thereto.
The modulation letter of the first embodiment of the LED drive for providing for this utility model as shown in Figures 3 and 4
Number oscillogram.Fig. 3 and Fig. 4 illustrate how the LED drive 2 of the present embodiment keeps working in that to determine power defeated
Exit pattern.
Fig. 3 show the modulating signal of microcontroller M, and wherein T is the cycle, and To represents opening time, triangle block table
Show electric current, the maximum current of Ip indication transformer TM, Vin represent the input voltage of direct-current input power supplying PWin.
From the figure 3, it may be seen that in the case where input voltage vin is fixed, maximum current Ip, average current Iav and power P in can
It is expressed as follows：
Ip=Vin/L*To ... ... ... ... ... ... ... ... ... ... ... ... .. (1)
Iav=Ip/2*Duty cycle=Ip/2*To/T.... ... ... ... ... ... ... ... ... (2)
Pin=Vin*Iav
=Vin*Ip/2*To/T
=Vin* (Vin/L*To)/2*To/T
=1/2Vin2To2/ (L*T) ... ... ... ... ... .... ... ... ... .. ... (3)
Inductance value of the wherein L for energy-storage module (transformator TM), working cycle of the Duty cycle for modulating signal.
As shown in figure 4, input voltage vin be promoted to 2 times and in the case that opening time To is reduced to half, maximum electricity
Stream Ip, average current Iav and power P in can be expressed as follows：
Ip=2Vin/L*To/2 ... ... ... ... ... ... ... ... ... ... ... .. (4)
Iav=Ip/2*Duty cycle=Ip/2* (To/2)/T.... ... .. ... .... ... ... ... ...
(5)
Pin=2Vin*Iav
=2Vin*Ip/2* (To/2)/T
=2Vin* (Vin/L*To)/2* (To/2)/T
=1/2Vin2To2/ (L*T) ... ... ... ... ... .... ... ... ... .. ... (6)
As long as from the foregoing, above-mentioned energy storage parameter constant, or when input voltage vin changes, while adjusting modulation
The working cycle (Duty cycle) of signal, you can make the inductance of energy-storage module (transformator TM) store in each opening time To
Energy be definite value, and then make power P in for definite value, can so making LED drive 2 keep working in, to determine power defeated
Exit pattern；Likewise, when changing the working cycle of modulating signal, while adjusting input voltage vin can make energy-storage module (transformation
Device TM) the energy that stores in each opening time To of inductance be definite value, and then make power P in for definite value, can equally make to light
Diode (led) driver 2 keeps working in determining power mode output.
As long as that is, manufacturer select suitable inductance, and in the procedure for producing of LED drive 2 by
Preset value input port P prior values enter default working cycle DD and default input voltage DV, you can the modulation of fixed microcontroller M
The working cycle of signal and the input voltage vin of direct-current input power supplying PWin, no matter input voltage vin is direct current or pulsating direct current
Can ensure that LED drive 2 keeps working in determining power mode output.
Even if additionally, input voltage vin or modulating signal working cycle change and cause power P in change, light two
Pole pipe driver 2 still can keep working in determining power mode output.For example, if input voltage vin drops to original 1/2, and
Power P in can also drop to original 1/4, but LED drive 2 can still keep working in determining power mode output, and
Even if now load voltage changes, LED drive 2 still can keep working in determining power mode output.
From the foregoing, the above embodiments are the energy storage parameters for limiting LED drive 2, therefore need not basis
Feedback signal adjusts modulating signal, therefore need not arrange feedback circuit, so can then form one and open circuit system, therefore can
Change the shortcoming of loop circuit circuit, lifted the stability of LED drive 2.Certainly, citing, this practicality be above are only
It is new to be not limited thereto.
The circuit diagram of the second embodiment of the LED drive of this utility model offer is provided.As schemed
Shown, LED drive 2 can be comprising switch S, transformator TM, microcontroller M.
The primary side of transformator TM can be connected with microcontroller M and direct-current input power supplying PWin, and can pass through diode D1
It is connected with switch S；The secondary side of transformator TM can be connected with LED light lamp LD by diode D2 and electric capacity C；Transformator
TM can store the energy of direct-current input power supplying PWin inputs.
Microcontroller M can be connected with switch S and direct-current input power supplying PWin；Microcontroller M can control direct-current input power supplying
The input voltage vin of PWin, and changeable switch S, make transformator TM export energy to LED light lamp LD.In the present embodiment
In, microcontroller M can include preset value input port P, and microcontroller M can receive default work week by preset value input port P
Phase DD, and modulating signal can be exported according to default working cycle DD to switch switch S, so that LED drive 2 can work
Make in determine power mode output；Wherein, preset working cycle DD and may be less than or equal to 50%；Additionally, microcontroller M also can be by pre-
If value input port P receives default input voltage DV, and can control direct-current input power supplying PWin's according to default input voltage DV
Input voltage vin, makes LED drive 2 be operable with determining power mode output.
From unlike previous embodiment, in the present embodiment, LED drive 2 can also suppress electricity comprising resonance
Road RRC, which can include diode D3 and transistor TR1.
Wherein, transistor TR1 can be PNP bipolarity junction transistors, and the collector of transistor TR1 can be with diode D3 just
Pole connects, and the emitter-base bandgap grading of transistor TR1 can be connected with switch S, and the base stage of transistor TR1 can be with one end of the primary side of transformator TM
Connection, the negative pole of diode D3 can be connected with the other end of the primary side of transformator TM and direct-current input power supplying PWin.
As the parasitic capacitance (Coss) for switching S can produce showing for resonance with the leakage inductance of transformator TM when S closings are switched
As, therefore can cause to produce unstable situation during transformator TM energy storage.And the LED drive 2 of the present embodiment can be wrapped
The suppression circuit RRC containing resonance, therefore the parasitic capacitance released energy to LED light lamp LD in transformator TM and switch S is anti-to transformator
When energy is released, transistor TR1 can be switched on, and the voltage that the parasitic capacitance of switch S is produced is input into direct-current input power supplying
PWin, therefore the covibration that the leakage inductance of the parasitic capacitance and transformator TM that can effectively eliminate switch S is produced.
By above-mentioned design, LED drive 2 is kept working in and is determined power mode output, therefore can fit
For with equal-wattage but the various light emitting diode illuminating apparatus with different rated current/voltages；Therefore, manufacturer is not
Again exclusive light emitting diode must be designed for which and is driven because light emitting diode illuminating apparatus have different rated current/voltages
Device, therefore the cost of light emitting diode illuminating apparatus can be greatly reduced.Additionally, LED drive 2 also effectively can suppress
The parasitic capacitance of switch produces the phenomenon of resonance with the leakage inductance for becoming electrical equipment or inductance, therefore further improves light emitting diode drive
The stability of dynamic device 2.Certainly, citing is above are only, this utility model is not limited thereto.
The circuit diagram of the 3rd embodiment of the LED drive of this utility model offer, this reality are provided
Apply example illustrate by it is of the present utility model design be applied to lifting/voltage reducing transducer (Buck＆Booster converter)
One of them preferably example.As illustrated, LED drive 2 can be comprising switch module, energy-storage module and process mould
Block；In the present embodiment, switch module can be switch S, and which can be metal oxide semiconductor field effect transistor (n-channel
MOSFET), energy-storage module can be inductance ID, and processing module can be microcontroller M；In other preferred embodiments, S is switched
Alternatively bipolarity junction transistor (BJT).
One end of inductance ID can be connected with microcontroller M and direct-current input power supplying PWin, and the other end of inductance ID can pass through
Diode D1 is connected with switch S；And LED light lamp LD then can be connected with inductance ID by diode D2 and electric capacity C；Inductance
ID can store the energy of direct-current input power supplying PWin inputs.
Microcontroller M can be connected with switch S and direct-current input power supplying PWin；Microcontroller M can control direct-current input power supplying
The input voltage vin of PWin, and changeable switch S, make inductance ID export energy to LED light lamp LD.In the present embodiment
In, microcontroller M can include preset value input port P, and microcontroller M can receive default work week by preset value input port P
Phase DD, and modulating signal can be exported according to default working cycle DD to switch switch S, so that LED drive 2 can work
Make in determine power mode output；Wherein, preset working cycle DD and may be less than or equal to 50%；Additionally, microcontroller M also can be by
Preset value input port P receives default input voltage DV, and can control direct-current input power supplying PWin according to default input voltage DV
Input voltage vin, make LED drive 2 be operable with determining power mode output.
Likewise, in the present embodiment, LED drive 2 also can be comprising resonance suppression circuit RRC, and which can include
Diode D3 and transistor TR1, the resonance that the leakage inductance of its parasitic capacitance and inductance ID that can effectively eliminate switch S is produced are existing
As, and suppression circuit RRC is similar to previous embodiment due to resonating, therefore here is not added to repeat.
By above-mentioned design, LED drive 2 is kept working in and is determined power mode output, therefore can fit
For with equal-wattage but the various light emitting diode illuminating apparatus with different rated current/voltages；Therefore, manufacturer is not
Therefore light emitting diode illuminating apparatus there must be different rated current/voltages and exclusive light emitting diode be designed for which again and driven
Device, therefore the cost of light emitting diode illuminating apparatus can be greatly reduced.Additionally, LED drive 2 also effectively can suppress
The parasitic capacitance of switch produces the phenomenon of resonance with the leakage inductance for becoming electrical equipment or inductance, therefore further improves light emitting diode drive
The stability of dynamic device 2.Certainly, citing is above are only, this utility model is not limited thereto.
It is noted that conventional light emitting diodes driver is determine current driver, thus manufacturer's needs be with
The light emitting diode illuminating apparatus of different rated current design it is different determine current driver, make light emitting diode illuminating apparatus
Cost is significantly lifted.Contrary, in an embodiment of the present utility model, the processing module of LED drive can pass through
Preset value input port is implanted into default working cycle and default input voltage in procedure for producing, so that the tune of processing module output
The input voltage of varying signal and direct-current input power supplying is definite value, therefore works in can LED drive and determine power mould
Formula, therefore all light emitting diode illuminating apparatus with same nominal power are applicable to, make light emitting diode illuminating apparatus
Cost be greatly reduced.
Also, conventional light emitting diodes driver is loop circuit circuit, therefore when the phase shift of feedback signal reaches 180 °
Vibration is easily produced, therefore makes the stability of conventional light emitting diodes driver not good.Contrary, an embodiment of the present utility model
In, LED drive is to open loop circuit, therefore does not have the shortcomings that loop circuit circuit, makes LED drive
Stability is lifted.
In addition, parasitic capacitance (Coss) meeting and energy storage when switch is closed of the switch of conventional light emitting diodes driver
The leakage inductance of module (transformator or inductance etc.) produces resonance, therefore can reduce further the steady of conventional light emitting diodes driver
It is qualitative.Contrary, in an embodiment of the present utility model, LED drive can be comprising resonance suppression circuit, and which can have
Effect ground suppresses the parasitic capacitance of switch to produce the phenomenon of resonance with the leakage inductance of energy-storage module, therefore further improves light-emitting diodes
The stability of pipe driver.
Additionally, in an embodiment of the present utility model, the modulating signal of the processing module output of LED drive
And the input voltage of direct-current input power supplying be definite value, therefore can ensure LED drive work in discontinuous conduction mode with
Continuous firing is in determining power mode, therefore LED drive has splendid reliability.
In addition, in an embodiment of the present utility model, the modulating signal of the processing module output of LED drive
And the input voltage of direct-current input power supplying is definite value, even if therefore the change of the load voltage of LED drive, light-emitting diodes
Pipe driver still may operate in determines power mode output, using upper more elasticity.
In addition, in an embodiment of the present utility model, LED drive is operable with determining power mode, therefore is
Multiple LED drive is directly connected in series or in parallel will not also make power consumption concentrate on any one
LED drive, therefore using upper more extensive.The LED drive of this utility model offer is provided
Fourth embodiment circuit diagram, example illustrates that by it is of the present utility model design be applied to lifting/voltage reducing transducer
One of them preferably example.As illustrated, LED drive 2 can include switch module, energy-storage module and process
Module；In the present embodiment, switch module can be switch S, and which can be metal oxide semiconductor field effect transistor (n-
Channel MOSFET), energy-storage module can be inductance ID, and processing module can be microcontroller M；In other preferred embodiments
In, switch S is alternatively bipolarity junction transistor (BJT).
One end of inductance ID can be connected with microcontroller M and direct-current input power supplying PWin, and the other end of inductance ID can pass through
Diode D1 is connected with switch S；And LED light lamp LD then can be connected with inductance ID by diode D2 and electric capacity C；Inductance
ID can store the energy of direct-current input power supplying PWin inputs.
Microcontroller M can be connected with switch S and direct-current input power supplying PWin；Microcontroller M can control direct-current input power supplying
The input voltage vin of PWin, and changeable switch S, make inductance ID export energy to LED light lamp LD.In the present embodiment
In, microcontroller M can include preset value input port P, and microcontroller M can receive default modulation ginseng by preset value input port P
Number DMS, and can modulating signal be exported according to default modulation parameter DMS to switch switch S, make inductance ID export energy to luminous two
Pole pipe lamp LD, thereby carries out light modulation 1 to LED light lamp LD.
Wherein, the resolution of the open-interval maximum of the pulse wave of modulating signal can include multiple stages, and microcontroller
Device M can adjust modulating signal according to default modulation parameter DMS, make modulating signal include multiple real rank sections and multiple extra
Virtual rank section, makes the increase resolution of the pulse wave of modulating signal.
Due to modulating signal pulse wave working cycle Jing often below 50%, and in general, microcontroller M outputs
When the working cycle of the pulse wave of modulating signal is below 50%, its resolution only had for 56 stages, i.e., which is only capable of output with 56 kinds
The pulse wave of pulsewidth, therefore when making LED drive 2 dim LED light lamp LD, often there is flicker
Phenomenon, it is impossible to reach and real dim without section.Contrary, the microcontroller M of the LED drive 2 of the present embodiment can be wrapped
The P of input port containing preset value, therefore manufacturer can enter default modulation parameter by preset value input port P prior values in procedure for producing
DMS, makes microcontroller M adjust modulating signal according to default modulation parameter DMS, and which can be in the multiple real rank section of modulating signal
The extra multiple virtual rank section of insertion, makes the resolution of the pulse wave of modulating signal be substantially improved, therefore makes light emitting diode
Driver 2 will not occur the phenomenon for flashing when dimming to LED light lamp LD, real be dimmed without section with reaching.
Likewise, in the present embodiment, LED drive 2 also can be comprising resonance suppression circuit RRC, and which can include
Diode D3 and transistor TR1, which effectively eliminates the covibration of the parasitic capacitance with the leakage inductance generation of inductance ID of switch S,
And due to resonating, suppression circuit RRC is similar to previous embodiment, therefore here is not added to repeat.Certainly, citing, this reality be above are only
It is not limited thereto with new.
The schematic diagram of the fourth embodiment of the LED drive of this utility model offer is provided.
For example when the operating frequency of the modulating signal of microcontroller M outputs is 200KHz, its cycle is 5us, now micro-control
The working cycle of the pulse wave of the modulating signal of device M outputs processed its resolution at 0～50% has K stage, i.e., which is only capable of output
Pulse wave with K kind pulsewidths, therefore the modulating signal of microcontroller M outputs can be comprising K real rank section.
As illustrated, microcontroller M can adjust modulating signal according to default modulation parameter DMS, which can be joined in default modulation
The real rank section of several K inserts extra virtual rank section, such as inserts the virtual rank section in extra 3；If each Shi Jie area
There is the pulse wave in 40 cycles in section, then n-th reality rank section can continue 200us (5us*40=200us), therefore, n-th reality rank
Section is 50us/200us (Wn)+50us/200us (Wn)+50us/200us (Wn)+50us/200us (Wn)；Wherein Wn is represented
The pulsewidth in n-th stage.
And first virtual rank section Nv-1 can be 50us/200us (Wn)+50us/200us (Wn)+50us/200us
(Wn)+50us/200us(Wn+1)；Wherein Wn represents the pulsewidth in n-th stage, and Wn+1 represents the pulsewidth in N+1 stage,
The plurality of pulse wave phase of the 75% of the plurality of pulse wave of i.e. first virtual rank section Nv-1 and corresponding n-th reality rank section
Together, the 25% of the plurality of pulse wave of first virtual rank section Nv-1 and next reality rank section (the N+1 real rank section)
The plurality of pulse wave is identical.
Second virtual rank section Nv-2 can be 50us/200us (Wn)+50us/200us (Wn)+50us/200us (Wn+
1)+50us/200us(Wn+1)；The 50% of the plurality of pulse wave of i.e. second virtual rank section Nv-2 and corresponding n-th reality rank
The plurality of pulse wave of section is identical, 50% and next reality rank section of the plurality of pulse wave of first virtual rank section Nv-1
The plurality of pulse wave of (the N+1 real rank section) is identical.
3rd virtual rank section Nv-3 can be 50us/200us (Wn)+50us/200us (Wn+1)+50us/200us (Wn
+1)+50us/200us(Wn+1) ；The 25% of the plurality of pulse wave of i.e. the 3rd virtual rank section Nv-3 and corresponding n-th reality
The plurality of pulse wave of rank section is identical, 75% and next reality rank section of the plurality of pulse wave of the 3rd virtual rank section Nv-3
The plurality of pulse wave of (the N+1 real rank section) is identical.
From the foregoing, n-th reality rank section can also include 3 extra virtual rank section Nv-1～Nv-3, and n-th
The composition of the virtual rank section Nv-1～Nv-3 of real rank section is differed；That is, by n-th reality rank section to N+1
3 extra virtual rank section Nv-1～Nv-3 can be included between individual real rank section, the resolution of the pulse wave of modulating signal is made
224 ranks are promoted to from 56 ranks, are original 4 times, LED drive 2 can so adjusted to LED light lamp LD
Light time will not occur the phenomenon for flashing, and real be dimmed without section with reaching.Certainly, citing is above are only, this utility model is not
As limit.
It is noted that the resolution of the pulse width modulation circuit of conventional light emitting diodes driver is not good, therefore
Be unable to reach it is real dim without section, therefore the efficiency of conventional light emitting diodes driver also needs to further be lifted.Contrary, this
In one embodiment of utility model, the processing module of LED drive can be by preset value input port in procedure for producing
Modulation parameter is preset in middle implantation, makes the modulating signal of processing module output include multiple real rank sections and multiple virtual rank areas
Section, therefore can solve the problems, such as the lack of resolution of the pulse wave of modulating signal, and can reach and real dim without section.
The circuit diagram of the 5th embodiment of the LED drive of this utility model offer, this reality are provided
Apply example to illustrate one of them preferably example for designing and being applied to lifting/voltage reducing transducer of the present utility model.As schemed
Shown, LED drive 2 can include switch module, energy-storage module and processing module；In the present embodiment, switch module
Can be switch S, which can be metal oxide semiconductor field effect transistor (n-channel MOSFET), and energy-storage module can be inductance
ID, and processing module can be microcontroller M.
One end of inductance ID can be connected with microcontroller M and direct-current input power supplying PWin, and the other end of inductance ID can pass through
Diode D1 is connected with switch S；And LED light lamp LD can then lead to diode D2 and electric capacity C is connected with inductance ID；Inductance ID
The energy of direct-current input power supplying PWin inputs can be stored.
Microcontroller M can be connected with switch S and direct-current input power supplying PWin, and the source electrode for switching S can be connected with resistance R,
The source electrode of switch S may connect to microcontroller M with the contact of resistance R, make microcontroller M detect the electric current of inductance ID；Micro-control
The input voltage vin of the controllable direct-current input power supplying PWin of device M processed, and changeable switch S, make inductance ID export energy to luminous
Diode lights LD.In the present embodiment, microcontroller M can include preset value input port P, and microcontroller M can detect inductance ID
Electric current, and default modulation parameter DMS can be received by preset value input port P, and can be adjusted according to the output of default modulation parameter DMS
Varying signal switchs S to switch, so that LED drive 2 is operable with determining power mode output；Wherein, preset work week
Phase, DD may be less than or equal to 50%.
Wherein, microcontroller M can be adjusted in the cut-out when the electric current of inductance ID reaches preset value according to default modulation parameter DMS
Varying signal, then modulating signal is exported again, thereby control the maximum current Ip of the electric current of inductance ID.Can by Fig. 3, Fig. 4 and formula (1)
Know, the maximum current Ip of inductance ID is not only relevant with the input voltage vin of direct-current input power supplying PWin, also open with modulating signal
Open time Ton relevant, and from formula (3), power P in is relevant with the maximum current Ip of inductance ID；Therefore, in the present embodiment
In, microcontroller M can detect the electric current of inductance ID, and modulating signal can be cut off when the electric current of inductance ID reaches preset value, then
Again modulating signal is exported, i.e., goes to control the maximum current Ip of inductance ID by another way, so that the maximum electricity of inductance ID
Stream Ip always remains at this preset value, and thereby can control power P in is definite value, is operable with LED drive 2
Determine power mode output.
As Figure 10 a, Figure 10 b, Figure 10 c and Figure 10 d show the of the LED drive of this utility model offer
The input voltage waveform figure of five embodiments, modulating signal oscillogram, current waveform figure and output oscillogram.
As shown in Figure 10 a, the input voltage vin of direct-current input power supplying PWin is pulsating dc voltage, and its waveform is all-wave
Rectified sine wave, therefore output Pout should also have similar waveform；However, this wave mode substantially has serious ripple phenomenon.
As shown in fig. lob, microcontroller M can control modulating signal according to default modulation parameter DMS, make modulating signal
Waveform is inversely proportional to the waveform of the input voltage vin of direct-current input power supplying PWin, and current waveform is then as shown in figure l oc.
As shown in fig. 10d, as microcontroller M can control modulating signal according to default modulation parameter DMS, make modulating signal
Waveform be inversely proportional to the waveform of the input voltage vin of direct-current input power supplying PWin, therefore the waveform of output Pout can be obtained
To adjustment；In the present embodiment, the similar trapezoidal wave of the waveform of output Pout, therefore ripple phenomenon is substantially significantly changed
It is kind.
From the foregoing, in the present embodiment, microcontroller M can control modulating signal according to default modulation parameter DMS, make
The waveform of modulating signal changes with the waveform of the input voltage vin of direct-current input power supplying PWin, thereby effectively can improve
Ripple phenomenon.
Likewise, in the present embodiment, LED drive 2 also can be comprising resonance suppression circuit RRC, and which can include
Diode D3 and transistor TR1, the resonance that the leakage inductance of its parasitic capacitance and inductance ID that can effectively eliminate switch S is produced are existing
As, and suppression circuit RRC is similar to previous embodiment due to resonating, therefore here is not added to repeat.
By above-mentioned design, LED drive 2 is kept working in and is determined power mode output, therefore can fit
For with equal-wattage but the various light emitting diode illuminating apparatus with different rated current/voltages；Therefore, manufacturer is not
Therefore light emitting diode illuminating apparatus there must be different rated current/voltages and exclusive light emitting diode be designed for which again and driven
Device, therefore the cost of light emitting diode illuminating apparatus can be greatly reduced.Additionally, LED drive 2 also effectively can suppress
The parasitic capacitance of switch produces the phenomenon of resonance with the leakage inductance for becoming electrical equipment or inductance, therefore further improves light emitting diode drive
The stability of dynamic device 2.In addition, LED drive 2 can also pass through the waveform for adjusting modulating signal so as to can be with direct current
The waveform change of the input voltage vin of input power PWin, therefore can effectively improve ripple phenomenon.Certainly, citing is above are only,
This utility model is not limited thereto.
In sum, in an embodiment of the present utility model, the processing module of LED drive can be by default
Value input port is implanted into default working cycle and default input voltage in procedure for producing, so that the modulation letter of processing module output
Number and the input voltage of direct-current input power supplying be definite value, therefore work in can LED drive and determine power mode, therefore
All light emitting diode illuminating apparatus with same nominal power are applicable to, the cost of light emitting diode illuminating apparatus is made
It is greatly reduced.
In an embodiment of the present utility model, the modulating signal and direct current of the processing module output of LED drive
The input voltage of input power is definite value, therefore can ensure that LED drive works in discontinuous conduction mode with lasting work
Make in determine power mode, therefore LED drive has splendid reliability.
In an embodiment of the present utility model, the modulating signal and direct current of the processing module output of LED drive
The input voltage of input power is definite value, even if therefore the change of the load voltage of LED drive, light emitting diode driving
Device still can be operated on determines power mode output, using upper more elasticity.
In an embodiment of the present utility model, the processing module of LED drive can pass through preset value input port
Default modulation parameter is implanted in procedure for producing, the maximum current of energy-storage module is thereby controlled, therefore can be ensured that light emitting diode drives
Dynamic device continuous firing is in discontinuous conduction mode with continuous firing in determining power mode, therefore the cost of LED drive
It is greatly reduced and has splendid reliability.
In an embodiment of the present utility model, LED drive can pass through the waveform for adjusting modulating signal so as to
Can change with the waveform of the input voltage of direct-current input power supplying, therefore can effectively improve ripple phenomenon.
Also, in an embodiment of the present utility model, LED drive is to open loop circuit, therefore does not have loop circuit
The shortcoming of circuit, is lifted the stability of LED drive.
In addition, in an embodiment of the present utility model, LED drive is operable with determining power mode, therefore is
Multiple LED drive is directly connected in series or in parallel will not also make power consumption concentrate on any one
LED drive, therefore using upper more extensive.
Additionally, in an embodiment of the present utility model, LED drive can be comprising resonance suppression circuit, and which can have
Effect ground suppresses the parasitic capacitance of switch and the leakage inductance for becoming electrical equipment or inductance to produce the phenomenon of resonance, therefore further improves luminous
The stability of diode (led) driver.
In addition, in an embodiment of the present utility model, the processing module of LED drive can be defeated by preset value
Inbound port is implanted into default modulation parameter in procedure for producing, makes the modulating signal of processing module output include multiple Shi Jie areas
Section and multiple virtual rank sections, therefore the lack of resolution of the pulse wave of modulating signal can be solved the problems, such as, and can reach real nothing
Section light modulation.
Illustrative is the foregoing is only, rather than is restricted.Other are any without departing from spirit and scope of the present utility model,
And equivalent modifications which is carried out or change, should be contained in this case scope of the claims.
Claims (22)
1. a kind of LED drive, it is characterised in that include：
One switch module；
One energy-storage module, is connected with the switch module, a direct-current input power supplying and a LED light lamp and to store the direct current defeated
Enter the energy of power input；And
One processing module, is connected and switches the switch module with the switch module and the direct-current input power supplying, makes the energy-storage module
Output energy is to the LED light lamp；
Wherein, the processing module receives a default working cycle to export a modulating signal to switch the switch module, so that should
LED drive works in certain power mode output.
2. LED drive according to claim 1, it is characterised in that the processing module receives a default input
Voltage, controls the direct-current input power supplying according to the default input voltage, makes the LED drive work in this and determines power
Output mode.
3. LED drive according to claim 1, it is characterised in that the processing module also includes a preset value
Input port, the processing module receive the default working cycle or a preset energy by the preset value input port.
4. LED drive according to claim 1, it is characterised in that the default working cycle is less than or equal to
50%.
5. LED drive according to claim 1, it is characterised in that also comprising a resonance suppression circuit, should
Resonance suppression circuit includes a diode and a transistor.
6. LED drive according to claim 1, it is characterised in that the switch module is metal oxidation half
Conductor field-effect transistor or bipolar junction transistor, the energy-storage module are an inductance or a transformator, and the processing module is
One microcontroller.
7. LED drive according to claim 2, it is characterised in that the processing module also includes a preset value
Input port, the processing module receive the default working cycle and the default input voltage or by the preset value input port
Preset energy.
8. LED drive according to claim 2, it is characterised in that the LED drive is worked in
One discontinuous conduction mode.
9. LED drive according to claim 5, it is characterised in that the transistor is connect for a PNP bipolaritys
Junction transistor, the collector of the transistor are connected with the positive pole of the diode, and the emitter-base bandgap grading of the transistor is connected with the switch module, should
The base stage of transistor is connected with one end of the energy-storage module, the negative pole of the diode and the other end of the energy-storage module and the direct current
Input power connects.
10. a kind of LED drive, it is characterised in that include：
One switch module；
One energy-storage module, is connected with the switch module, a direct-current input power supplying and a LED light lamp and to store the direct current defeated
Enter the energy of power input；And
One processing module, is connected and receives a default modulation parameter to export a tune with the switch module and the direct-current input power supplying
Varying signal makes the energy-storage module export energy to the LED light lamp, with to the light emitting diode to switch the switch module
Lamp is dimmed；
Wherein, the resolution of the open-interval maximum of a pulse wave of the modulating signal includes multiple stages, the processing module
According to the default modulation parameter adjustment modulating signal, the modulating signal is made to include multiple real rank sections, and each Shi Jie area
Section also includes a virtual rank section.
11. LED drive according to claim 10, it is characterised in that the processing module is also default comprising one
Value input port, the processing module receive the default modulation parameter by the preset value input port.
12. LED drive according to claim 10, it is characterised in that the switch module is aoxidized for a metal
Semiconductcor field effect transistor or bipolar junction transistor, the energy-storage module are an inductance or a transformator, the processing module
For a microcontroller.
13. LED drive according to claim 10, it is characterised in that each real rank section is comprising multiple
The pulse wave in cycle, the pulse wave of the virtual rank section comprising multiple cycles of each real rank section, the virtual rank section
A part for the plurality of pulse wave is identical with the plurality of pulse wave of the corresponding real rank section, the plurality of pulse wave of the virtual rank section
Another part it is identical with the plurality of pulse wave of the next real rank section.
14. LED drive according to claim 10, it is characterised in that the processing module is according to the default tune
Variable element adjusts the modulating signal, makes the modulating signal comprising multiple Shi Jie areas, and each real rank section also includes multiple void
Intend rank section.
15. LED drive according to claim 14, it is characterised in that each real rank section is comprising multiple
The pulse wave in cycle, the pulse wave of each virtual rank section of each real rank section comprising multiple cycles, each this it is virtual
A part for the plurality of pulse wave of rank section is identical with the plurality of pulse wave of the corresponding real rank section, the virtual rank section should
Another part of multiple pulse waves is identical with the plurality of pulse wave of the next real rank section.
16. LED drive according to claim 15, it is characterised in that each real rank section it is the plurality of
The composition of virtual rank section is differed.
17. a kind of LED drive, it is characterised in that include：
One switch module；
One energy-storage module, is connected with the switch module, a direct-current input power supplying and a LED light lamp and to store the direct current defeated
Enter the energy of power input；And
One processing module, is connected and switches the switch module with the switch module and the direct-current input power supplying, makes the energy-storage module
Output energy is to the LED light lamp；
Wherein, the processing module detect the energy-storage module electric current and receive a default modulation parameter with export a modulating signal with
Switch the switch module, the processing module is according to the default modulation parameter when the electric current of the energy-storage module reaches a preset value
The modulating signal is cut off, then exports again the modulating signal, so that the LED drive works in certain power output
Pattern.
18. LED drive according to claim 17, it is characterised in that the switch module is aoxidized for a metal
Semiconductcor field effect transistor or bipolar junction transistor, the energy-storage module are an inductance or a transformator, the processing module
For a microcontroller.
19. LED drive according to claim 17, it is characterised in that the LED drive works
In a discontinuous conduction mode.
20. LED drive according to claim 17, it is characterised in that the processing module is according to the default tune
The VARIABLE PARAMETER PID CONTROL modulating signal, makes the waveform of the modulating signal and the ripple of an input voltage of the direct-current input power supplying be formed instead
Than.
21. LED drive according to claim 17, it is characterised in that the processing module is also default comprising one
Value input port, the processing module receive the default modulation parameter by the preset value input port.
22. LED drive according to claim 17, it is characterised in that also comprising a resistance, the resistance with
The switch module connects, and the resistance is connected with the processing module with the contact of the switch module.
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|---|---|---|---|
| CN201620854447.XU CN206061209U (en) | 2016-08-09 | 2016-08-09 | LED drive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620854447.XU CN206061209U (en) | 2016-08-09 | 2016-08-09 | LED drive |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107708246A (en) * | 2016-08-09 | 2018-02-16 | 东林科技股份有限公司 | LED drive and its driving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107708246A (en) * | 2016-08-09 | 2018-02-16 | 东林科技股份有限公司 | LED drive and its driving method |
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