CN103687151A - Drive circuit - Google Patents
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- CN103687151A CN103687151A CN201210351983.4A CN201210351983A CN103687151A CN 103687151 A CN103687151 A CN 103687151A CN 201210351983 A CN201210351983 A CN 201210351983A CN 103687151 A CN103687151 A CN 103687151A
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Abstract
The invention provides a drive circuit which is used for driving a light emitting module. The light emitting module comprises a first light emitting unit,..., a Nth light emitting unit, a first connecting end,..., and a N+1th connecting end, wherein N is no less than 2. The drive circuit comprises a rectifier which receives external alternating current power and is used for rectifying the alternating current power to generate rectification power, a power factor corrector which receives the rectification power, and is used for generating drive power according to the rectification power, outputting the drive power to the first connecting end of the light emitting module and changing the current circulation time of the rectifier to improve the power factor of the alternating current power, and a current control module which receives the drive power, and is used for drawing current from at least one target connecting end in the second connecting end to the N+1th connecting end according to the voltage amplitude of the drive power.
Description
Technical field
The present invention relates to a kind of drive circuit, particularly relate to a kind of for driving the drive circuit of light-emitting diode.
Background technology
Consult Fig. 1 and Fig. 2, a kind of existing drive circuit 10 is for driving an illuminating module 13.Illuminating module 13 comprises the first link 131, the second link 132, and is connected on a plurality of light-emitting diodes 133 of 132 of the first link 131 and the second links.Drive circuit 10 comprises a full-bridge rectifier 11 and a current regulator 12.Full-bridge rectifier 11 receives an alternating electromotive force, is electrically connected to the first link 131 of illuminating module 13, for alternating electromotive force is carried out to rectification, to produce a rectification electric power, and exports rectification electric power to illuminating module 13.Current regulator 12 is electrically connected to the second link 132 of illuminating module 13, for drawing electric current from the second link 132, and adjusts the amplitude of the electric current draw.
The voltage of rectification electric power is as shown in curve 141, and the brightness of illuminating module 13 is as shown in curve 142.When the voltage magnitude of rectification electric power is greater than the forward voltage amplitude Vf (forward voltage) of illuminating module 13, illuminating module 13 has electric current to flow through (current amplitude is determined by current regulator 12), thereby luminous, and brightness is proportional to current amplitude that current regulator 12 determines and the number of light-emitting diode 133, and when the voltage magnitude of rectification electric power is less than the forward voltage amplitude Vf of illuminating module 13, illuminating module 13 does not have electric current to flow through, thereby not luminous, zero luminance.
Yet existing drive circuit 10 has following shortcoming:
(1) make the power factor of alternating electromotive force on the low side.
(2) make illuminating module 13 have the point of the alternating electromotive force two frequencys multiplication phenomenon of going out, user can feel that when long-term use eyes are uncomfortable, and the mean flow rate of illuminating module 13 is lower.
(3) when the voltage magnitude of rectification electric power is greater than the forward voltage amplitude Vf of illuminating module 13, voltage differences can be across being added on current regulator 12 and is caused power loss, and the difference of the forward voltage amplitude Vf of the voltage peak of rectification electric power and illuminating module 13 is larger, power loss is larger, and efficiency is poorer.
Summary of the invention
An object of the present invention is to provide a kind of drive circuit, can improve the part shortcoming of background technology.
Drive circuit of the present invention is used for driving an illuminating module.This illuminating module comprises the first luminescence unit to the N luminescence unit, and the first link to the N+1 link.This M luminescence unit is connected electrically between this M link and this M+1 link.Each luminescence unit comprises at least one light-emitting diode.N≥2，M=1,…,N。This drive circuit comprises a rectifier, a power factor corrector (Power factor corrector, PFC) and a Current Control module.This rectifier receives an alternating electromotive force from outside, for this alternating electromotive force is carried out to rectification, to produce a rectification electric power.This power factor corrector is electrically connected to this rectifier to receive this rectification electric power, be electrically connected to the first link of this illuminating module, for producing one according to this rectification electric power, drive electric power, and export this driving electric power to this illuminating module, and change the current flowing time of this rectifier, to promote the power factor of this alternating electromotive force.This Current Control module is electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to the second link to the N+1 link of this illuminating module, for the voltage magnitude that drives electric power according to this, at least one target link from this second link to the N+1 link draws electric current.
Drive circuit of the present invention, this Current Control module comprises: the first current regulator to the N current regulator, be electrically connected to respectively the second link to the N+1 link of this illuminating module, M current regulator is used for drawing electric current from M+1 link, and regulates the amplitude of the electric current drawing; The first switch to the N switch, be electrically connected to respectively this first current regulator to this N current regulator, each switch is controlled to be switched between conducting and not conducting, this M current regulator is when M switch conduction, from this M+1 link, draw electric current, and when this not conducting of M switch, from this M+1 link, do not draw electric current; An and switch control unit, be electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to described switch, for controlling described switch according to the voltage magnitude of this driving electric power, so that a wherein target switch conducting corresponding with this target link, and make not conducting of rest switch.
N=2 in drive circuit of the present invention, the first luminescence unit of this illuminating module and the second luminescence unit comprise respectively P1 light-emitting diode and P2 light-emitting diode, and the current amplitude ratio of this first current regulator and this second current regulator is (P1+P2): P1.
N >=3 in drive circuit of the present invention, this Current Control module comprises: the first current regulator to the N current regulator, be electrically connected to respectively the second link to the N+1 link of this illuminating module, M current regulator is used for drawing electric current from this M+1 link, and regulates the amplitude of the electric current drawing; The first switch to the L switch, each switch is electrically connected at least one in described current regulator, and controlledly between conducting and not conducting, switch, this M current regulator is when the voltage magnitude of this corresponding switch conduction and this driving electric power is enough to make M luminescence unit forward conduction, from this M+1 link, draw electric current, otherwise, from this M+1 link, do not draw electric current, 1<L<N; An and switch control unit, be electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to described switch, for controlling described switch according to the voltage magnitude of this driving electric power, so that a wherein target switch conducting corresponding with this target link, and make not conducting of rest switch.
In drive circuit of the present invention, this power factor corrector is one and fills out paddy power factor corrector.
Another object of the present invention is to provide a kind of drive circuit, can improve the part shortcoming of background technology.
Drive circuit of the present invention is used for driving an illuminating module.This illuminating module comprises the first luminescence unit to the three luminescence units, and the first link to the four links.This first luminescence unit is connected electrically between this first link and the second link.This second luminescence unit is connected electrically between this second link and the 3rd link.The 3rd luminescence unit is connected electrically between this first link and the 4th link.Each luminescence unit comprises at least one light-emitting diode.This drive circuit comprises a rectifier, a power factor corrector and a Current Control module.This rectifier receives an alternating electromotive force from outside, for this alternating electromotive force is carried out to rectification, to produce a rectification electric power.This power factor corrector is electrically connected to this rectifier to receive this rectification electric power, be electrically connected to the first link of this illuminating module, for producing one according to this rectification electric power, drive electric power, and export this driving electric power to this illuminating module, and change the current flowing time of this rectifier, to promote the power factor of this alternating electromotive force.This Current Control module is electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to the 3rd link and the 4th link of this illuminating module, for the voltage magnitude that drives electric power according to this, the target link from the 3rd link and the 4th link draws electric current.
The Current Control module of drive circuit of the present invention comprises: the first current regulator and the second current regulator, be electrically connected to respectively the 3rd link and the 4th link of this illuminating module, M current regulator is for drawing electric current from M+2 link, and regulate the amplitude of the electric current draw, M=1,2; The first switch and second switch, be electrically connected to respectively this first current regulator and this second current regulator, each switch is controlled to be switched between conducting and not conducting, this M current regulator is when M switch conduction, from this M+2 link, draw electric current, and when this not conducting of M switch, from this M+2 link, do not draw electric current; A switch control unit, be electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to described switch, for controlling described switch according to the voltage magnitude of this driving electric power, so that a wherein target switch conducting corresponding with this target link, and make not conducting of rest switch.
Drive circuit of the present invention, this Current Control module also comprises: a diode, there is an anode that is electrically connected to the second link of this illuminating module, and a negative electrode that is electrically connected to the 4th link of this illuminating module.
Drive circuit of the present invention, the current amplitude ratio of this first current regulator and this second current regulator is 1:2.
Drive circuit of the present invention, this power factor corrector is one and fills out paddy power factor corrector.
Beneficial effect of the present invention is: by this power factor corrector, can improve the power factor of this alternating electromotive force; Make this illuminating module continue to light, the point of these alternating electromotive force two frequencys multiplication phenomenon of going out not, user can not feel that when long-term use eyes are uncomfortable, and can improve the mean flow rate of this illuminating module.
Accompanying drawing explanation
Fig. 1 is a circuit diagram, and a kind of existing drive circuit is described, for driving an illuminating module;
Fig. 2 is a sequential chart, the voltage of the rectification electric power that the drive circuit of key diagram 1 produces, and the brightness of the illuminating module of Fig. 1;
Fig. 3 is a circuit diagram, and the first preferred embodiment of drive circuit of the present invention is described, for driving an illuminating module;
Fig. 4 is a sequential chart, the voltage of the driving electric power that the first preferred embodiment of key diagram 3 produces, and the brightness of the illuminating module of Fig. 3;
Fig. 5 is a circuit diagram, and the second preferred embodiment of drive circuit of the present invention is described, for driving an illuminating module;
Fig. 6 is a sequential chart, the voltage of the driving electric power that the second preferred embodiment of key diagram 5 produces, and the brightness of the illuminating module of Fig. 5;
Fig. 7 is a circuit diagram, the 3rd preferred embodiment of drive circuit of the present invention is described, for driving an illuminating module;
Fig. 8 is a circuit diagram, the 4th preferred embodiment of drive circuit of the present invention is described, for driving an illuminating module;
Fig. 9 is a sequential chart, the voltage of the driving electric power that the 4th preferred embodiment of key diagram 8 produces, and the brightness of the illuminating module of Fig. 8;
Figure 10 is a circuit diagram, the 5th preferred embodiment of drive circuit of the present invention is described, for driving an illuminating module.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The first preferred embodiment
Consult Fig. 3 and Fig. 4, the first preferred embodiment 20 of drive circuit of the present invention is for driving an illuminating module 24.Illuminating module 24 comprises the first luminescence unit 251, the second luminescence unit 252, and the first link 261, the second link 262, the 3rd link 263.M luminescence unit is connected electrically between M link and M+1 link, M=1,2.Each luminescence unit (251 and 252) comprises at least one light-emitting diode 250.In the present embodiment, the first luminescence unit 251 and the second luminescence unit 252 have the light-emitting diode 250 of equal number.
The present embodiment drive circuit 20 comprises a rectifier 21, a power factor corrector 22 and a Current Control module 23.
Power factor corrector 22 is electrically connected to rectifier 21 to receive rectification electric power, be electrically connected to the first link 261 of illuminating module 24, for producing one according to rectification electric power, drive electric power, and output drives electric power to illuminating module 24, and change the current flowing time of rectifier 21, to promote the power factor of alternating electromotive force.In the present embodiment, power factor corrector 22 be a passive type fill out paddy (valley fill) power factor corrector, but in other embodiments, power factor corrector 22 can be an active power factor corrector.
In the present embodiment, Current Control module 23 comprises the first current regulator 2311 and the second current regulator 2312, the first switch 2321 and second switch 2322, and a switch control unit 233.
The first current regulator 2311 and the second current regulator 2312 are electrically connected to respectively the second link 262 and the 3rd link 263 of illuminating module 24.M current regulator is used for drawing electric current from M+1 link, and regulates the amplitude of the electric current drawing.In the present embodiment, the current amplitude ratio of the first current regulator 2311 and the second current regulator 2312 is essentially 1:1.
The first switch 2321 is electrically connected to respectively the first current regulator 2311 and the second current regulator 2312 with second switch 2322.Each switch (2321 and 2322) is controlled to be switched between conducting and not conducting.M current regulator, when M switch conduction, draws electric current from M+1 link, and when the not conducting of M switch, from M+1 link, does not draw electric current.
Drive the voltage of electric power as shown in curve 271, the brightness of illuminating module 24 is as shown in curve 272.The operation of the present embodiment drive circuit 20 can be divided into two stages, is respectively first stage I and second stage II.Below describe this two stages in detail.
First stage I
When driving the voltage magnitude of electric power to be greater than the forward voltage amplitude Vf1 of the first luminescence unit 251 and the second luminescence unit 252, during the summation of Vf2, drive the voltage of electric power to be enough to make Zener diode 2335 collapses, and drive the difference of the voltage of electric power and the breakdown voltage of Zener diode 2335 through resistance 2333, 2334 dividing potential drop metapedes are so that second switch 2322 conductings, now, diode 2336 makes the first switch 2321 not conductings, the second current regulator 2312 is from the 3rd link 263(of illuminating module 24 target link namely) draw electric current, make the first luminescence unit 251 and the second luminescence unit 252 have electric current to flow through (current amplitude is determined by the second current regulator 2312), thereby luminous, and the brightness of illuminating module 24 is proportional to the current amplitude that the second current regulator 2312 determines, and the total number of the light-emitting diode 250 of first luminescence unit 251 and the second luminescence unit 252.
Second stage II
When driving the voltage magnitude of electric power to be greater than the forward voltage amplitude Vf1 of the first luminescence unit 251, but be less than the forward voltage amplitude Vf1 of the first luminescence unit 251 and the second luminescence unit 252, during the summation of Vf2, drive the undertension of electric power so that second switch 2322 conductings, but through resistance 2331, 2332 dividing potential drop metapedes are so that the first switch 2321 conductings, now, the first current regulator 2311 is from the second link 262(of illuminating module 24 target link namely) draw electric current, make the first luminescence unit 251 have electric current to flow through (current amplitude is determined by the first current regulator 2311), thereby luminous, and the brightness of illuminating module 24 is proportional to the current amplitude that the first current regulator 2311 determines, and the number of the light-emitting diode 250 of the first luminescence unit 251.
In the present embodiment, because the current amplitude ratio of the first current regulator 2311 and the second current regulator 2312 is essentially 1:1, and the total number of the light-emitting diode 250 of the first luminescence unit 251 and the second luminescence unit 252 is 2:1 to the ratio of the number of the light-emitting diode 250 of the first luminescence unit 251, so illuminating module 24 is essentially 2:1 in the brightness ratio of first stage I and second stage II.
The present embodiment drive circuit 20 has the following advantages:
(1), by power factor corrector 22, can improve the power factor of alternating electromotive force.
(2) make illuminating module 24 continue to light, there is no the point of the alternating electromotive force two frequencys multiplication phenomenon of going out, user more can not feel that when long-term use eyes are uncomfortable, and can improve the mean flow rate of illuminating module 24.
Preferably, in other embodiments, when the first luminescence unit 251 of illuminating module 24 and the second luminescence unit 252 comprise respectively P1 and P2 light-emitting diode 250, the current amplitude ratio of the first current regulator 2311 and the second current regulator 2312 is designed to be essentially (P1+P2): P1, thereby illuminating module 24 is essentially 1:1 in the brightness ratio of first stage I and second stage II, this can further promote the eyes comfort level of user when long-term use.
The second preferred embodiment
Consult Fig. 5 and Fig. 6, the second preferred embodiment 30 of drive circuit of the present invention is for driving an illuminating module 34.Illuminating module 34 comprises the first to the 6th luminescence unit 351～356, and the first to the 7th link 361～367.M luminescence unit is connected electrically between M link and M+1 link, M=1 ..., 6.Each luminescence unit 351～356 comprises at least one light-emitting diode 350.
The present embodiment drive circuit 30 comprises a rectifier 31, a power factor corrector 32 and a Current Control module 33.The rectifier 21(that rectifier 31 and power factor corrector 32 are same as respectively the first preferred embodiment is shown in Fig. 3) and power factor corrector 22(see Fig. 3), no longer add explanation herein.
In the present embodiment, Current Control module 33 comprises the first to the 6th current regulator 3311～3316, the first to the 6th switch 3321～3326, and a switch control unit 333.
The first to the 6th current regulator 3311～3316 is electrically connected to respectively the second to the 7th link 362～367 of illuminating module 34.M current regulator is used for drawing electric current from M+1 link, and regulates the amplitude of the electric current drawing.
The first to the 6th switch 3321～3326 is electrically connected to respectively the first to the 6th current regulator 3311～3316.Switch 3321～3326 is controlled between conducting and not conducting, switches for each.M current regulator, when M switch conduction, draws electric current from M+1 link, and when the not conducting of M switch, from M+1 link, does not draw electric current.
Drive the voltage of electric power as shown in curve 371, the brightness of illuminating module 34 is as shown in curve 372.The operation of the present embodiment drive circuit 30 can be divided into six stages, is respectively first stage I to the six stages VI.Below describe this six stages in detail.
First stage I
When driving the voltage magnitude of electric power to be greater than the summation of forward voltage amplitude Vf1～Vf6 of the first to the 6th luminescence unit 351～356, the 6th switch 3326 conductings, rest switch 3321～3325 not conductings, the 6th current regulator 3316 is from the 7th link 367(of illuminating module 34 target link namely) draw electric current, make the first to the 6th luminescence unit 351～356 have electric current to flow through (current amplitude is determined by the 6th current regulator 3316), thereby luminous, and the brightness of illuminating module 34 is proportional to the current amplitude that the 6th current regulator 3316 determines, and the total number of the first light-emitting diode 350 to the 6th luminescence unit 351～356.
Second stage II
When driving the voltage magnitude of electric power to be greater than the summation of the forward voltage amplitude Vf1～Vf5 of the first to the 5th luminescence unit 351～355, but while being less than the summation of forward voltage amplitude Vf1～Vf6 of the first to the 6th luminescence unit 351～356, the 5th switch 3325 conductings, rest switch 3321～3324, 3326 not conductings, the 5th current regulator 3315 is from the 6th link 366(of illuminating module 34 target link namely) draw electric current, make the first to the 5th luminescence unit 351～355 have electric current to flow through (current amplitude is determined by the 5th current regulator 3315), thereby luminous, and the brightness of illuminating module 34 is proportional to the current amplitude that the 5th current regulator 3315 determines, and the total number of the first light-emitting diode 350 to the 5th luminescence unit 351～355.
Phase III III
When driving the voltage magnitude of electric power to be greater than the summation of the forward voltage amplitude Vf1～Vf4 of first to fourth luminescence unit 351～354, but while being less than the summation of forward voltage amplitude Vf1～Vf5 of the first to the 5th luminescence unit 351～355, the 4th switch 3324 conductings, rest switch 3321, 3322, 3323, 3325, 3326 not conductings, the 4th current regulator 3314 is from the 5th link 365(of illuminating module 34 target link namely) draw electric current, make first to fourth luminescence unit 351～354 have electric current to flow through (current amplitude is determined by the 4th current regulator 3314), thereby luminous, and the brightness of illuminating module 34 is proportional to the current amplitude that the 4th current regulator 3314 determines, and the total number of the light-emitting diode 350 of first to fourth luminescence unit 351～354.
Fourth stage IV
After phase III III, when driving the voltage magnitude of electric power to be greater than the summation of the forward voltage amplitude Vf1～Vf3 of the first to the 3rd luminescence unit 351 ~～353, but while being less than the summation of forward voltage amplitude Vf1～Vf4 of first to fourth luminescence unit 351～354, the 3rd switch 3323 conductings, rest switch 3321, 3322, 3324, 3325, 3326 not conductings, the 3rd current regulator 3313 is from the 4th link 364(of illuminating module 34 target link namely) draw electric current, make the first to the 3rd luminescence unit 351～353 have electric current to flow through (current amplitude is determined by the 3rd current regulator 3313), thereby luminous, and the brightness of illuminating module 34 is proportional to the current amplitude that the 3rd current regulator 3313 determines, and the total number of the first light-emitting diode 350 to the 3rd luminescence unit 351～353.
Five-stage V
After fourth stage IV, when driving the voltage magnitude of electric power to be greater than the forward voltage amplitude Vf1 of the first luminescence unit 351 and the second luminescence unit 352, the summation of Vf2, but while being less than the summation of forward voltage amplitude Vf1～Vf3 of the first to the 3rd luminescence unit 351～353, second switch 3322 conductings, rest switch 3321, 3323～3326 not conductings, the second current regulator 3312 is from the 3rd link 363(of illuminating module 34 target link namely) draw electric current, make the first luminescence unit 351 and the second luminescence unit 352 have electric current to flow through (current amplitude is determined by the second current regulator 3312), thereby luminous, and the brightness of illuminating module 34 is proportional to the current amplitude that the second current regulator 3312 determines, and the total number of the light-emitting diode 350 of first luminescence unit 351 and the second luminescence unit 352.
The 6th stage VI
After five-stage V, when driving the voltage magnitude of electric power to be greater than the forward voltage amplitude Vf1 of the first luminescence unit 351, but while being less than the summation of forward voltage amplitude Vf1～Vf4 of first to fourth luminescence unit 351～354, the first switch 3322 conductings, rest switch 3322～3326 not conductings, the first current regulator 3311 is from the second link 362(of illuminating module 34 target link namely) draw electric current, make the first luminescence unit 351 have electric current to flow through (current amplitude is determined by the first current regulator 3311), thereby luminous, and the brightness of illuminating module 34 is proportional to the current amplitude that the first current regulator 3311 determines, and the number of the light-emitting diode 350 of the first luminescence unit 351.
The present embodiment drive circuit 30 has the following advantages:
(1), by power factor corrector 32, can improve the power factor of alternating electromotive force.
(2) make illuminating module 34 continue to light, there is no the point of the alternating electromotive force two frequencys multiplication phenomenon of going out, user more can not feel that when long-term use eyes are uncomfortable, and can improve the mean flow rate of illuminating module 24.
Preferably, can be by suitably adjusting the first to the 6th luminescence unit 351～356 number of included light-emitting diode 350 separately in the design phase, and the amplitude of the first to the 6th electric current of drawing separately of current regulator 3311～3316, make illuminating module 34 less in the brightness variation of first stage I to the six stages VI, this can further promote the eyes comfort level of user when long-term use.
(3) make illuminating module 34 operate in the more multistage, can reduce across the voltage being added on the first to the 6th current regulator 3311～3316, thereby reduce power loss, and raise the efficiency.
The 3rd preferred embodiment
Consult Fig. 7, the 3rd preferred embodiment 30 ' of drive circuit of the present invention is shown in Fig. 5 to the second preferred embodiment 30() similar, different places is Current Control module 33 '.
In the present embodiment, Current Control module 33 ' is for according to the voltage magnitude that drives electric power, and at least one target link the from second to the 7th link 362～367 draws electric current, and is to comprise the first switch 3321 ' and second switch 3322 '.The first switch 3321 ' is electrically connected to the first to the 3rd current regulator 3311～3313.Second switch 3322 ' is electrically connected to the 4th to the 6th current regulator 3314～3316.M current regulator, when the voltage magnitude of corresponding switch conduction and driving electric power is enough to make M luminescence unit forward conduction, draws electric current from M+1 link, otherwise, from M+1 link, do not draw electric current.Switch control unit 333 ' is electrically connected to switch 3321 ', 3322 ', for according to the voltage magnitude control switch 3321 ', 3322 ' that drives electric power, so that a wherein target switch conducting corresponding with target link, and make not conducting of rest switch.
When second switch 3322 ' conducting, the first switch 3321 ' not conducting, drive the voltage magnitude of electric power to be enough to make first during to the 6th luminescence unit 351～356 forward conduction, the the 4th to the 6th current regulator 3314～3316 is respectively from the 5th to the 7th link 365～367(of illuminating module 34 target link namely) draw electric current, make the first to the 6th luminescence unit 351～356 have electric current to flow through, thereby luminous, and the brightness of illuminating module 34 is affected by current amplitude that the 4th to the 6th current regulator 3314～3316 determines and the number of the first light-emitting diode 350 to the 6th luminescence unit 351～356.
When second switch 3322 ' conducting, the first switch 3321 ' not conducting, drive the voltage magnitude of electric power to be enough to make the first to the 5th luminescence unit 351～355 forward conductions, but during not enough so that the 6th luminescence unit 356 forward conduction, the 4th current regulator 3314 and the 5th current regulator 3315 are respectively from the 5th link 365 of illuminating module 34 and the 6th link 366(target link namely) draw electric current, make the first to the 5th luminescence unit 351～355 have electric current to flow through, thereby luminous, and the brightness of illuminating module 34 is affected by current amplitude that the 4th current regulator 3314 and the 5th current regulator 3315 determine and the number of the first light-emitting diode 350 to the 5th luminescence unit 351～355.
When second switch 3322 ' conducting, the first switch 3321 ' not conducting, drive the voltage magnitude of electric power to be enough to make first to fourth luminescence unit 351～354 forward conductions, but when not enough so that the 5th luminescence unit 355 and the 6th luminescence unit 356 forward conduction, the 4th current regulator 3314 is from the 5th link 365(of illuminating module 34 target link namely) draw electric current, make first to fourth luminescence unit 351～354 have electric current to flow through, thereby luminous, and the brightness of illuminating module 34 is affected by the number of the light-emitting diode 350 of current amplitude that the 4th current regulator 3314 determines and first to fourth luminescence unit 351～354.
When the first switch 3321 ' conducting, second switch 3322 ' not conducting, drive the voltage magnitude of electric power to be enough to make the first to the 3rd luminescence unit 351～353 forward conductions, but not enough so that the 4th during to the 6th luminescence unit 354～356 forward conduction, the first to the 3rd current regulator 3311～3313 is respectively from second to the 4th link 362～364(of illuminating module 34 target link namely) draw electric current, make the first to the 3rd luminescence unit 351～353 have electric current to flow through, thereby luminous, and the brightness of illuminating module 34 is affected by current amplitude that the first to the 3rd current regulator 3311～3313 determines and the number of the first light-emitting diode 350 to the 3rd luminescence unit 351～353.
When the first switch 3321 ' conducting, second switch 3322 ' not conducting, drive the voltage magnitude of electric power to be enough to make the first luminescence unit 351 and the second luminescence unit 352 forward conductions, but not enough so that the 3rd during to the 6th luminescence unit 353～356 forward conduction, the first current regulator 3311 and the second current regulator 3312 are respectively from the second link 362 of illuminating module 34 and the 3rd link 363(target link namely) draw electric current, make the first luminescence unit 351 and the second luminescence unit 352 have electric current to flow through, thereby luminous, and the brightness of illuminating module 34 is affected by the number of the light-emitting diode 350 of current amplitude that the first current regulator 3311 and the second current regulator 3312 determine and the first luminescence unit 351 and the second luminescence unit 352.
When the first switch 3321 ' conducting, second switch 3322 ' not conducting, drive the voltage magnitude of electric power to be enough to make the first luminescence unit 351 forward conductions, but not enough so that second during to the 6th luminescence unit 352～356 forward conduction, the first current regulator 3311 is from the second link 362(of illuminating module 34 target link namely) draw electric current, make the first luminescence unit 351 have electric current to flow through, thereby luminous, and the brightness of illuminating module 34 is affected by the number of the light-emitting diode 350 of current amplitude that the first current regulator 3311 determines and the first luminescence unit 351.
It should be noted that, in other embodiments, Current Control module 33 ' can comprise two more switches of switch than the present embodiment, but the number of switch must be less than the number of current regulator, and each switch can be electrically connected to and be greater than three or be less than three current regulators.
The 4th preferred embodiment
Consult Fig. 8 and Fig. 9, the 4th preferred embodiment 40 of drive circuit of the present invention is for driving an illuminating module 44.Illuminating module 44 comprises the first to the 3rd luminescence unit 451～453, and first to fourth link 461～464.The first luminescence unit 451 is connected electrically in 462 of the first link 461 and the second links.The second luminescence unit 452 is connected electrically in 463 of the second link 462 and the 3rd links.The 3rd luminescence unit is connected electrically in 464 of the first link 461 and the 4th links.Each luminescence unit 451～453 comprises at least one light-emitting diode 450.In the present embodiment, the first to the 3rd luminescence unit 451～453 has the light-emitting diode 450 of equal number.
The present embodiment drive circuit 40 comprises a rectifier 41, a power factor corrector 42 and a Current Control module 43.The rectifier 21(that rectifier 41 and power factor corrector 42 are same as respectively the first preferred embodiment is shown in Fig. 3) and power factor corrector 22(see Fig. 3), no longer add explanation herein.
In the present embodiment, Current Control module 43 comprises the first current regulator 4311 and the second current regulator 4312, the first switch 4321 and second switch 43214322, and a switch control unit 433.
The first current regulator 4311 and the second current regulator 4312 are electrically connected to respectively the 3rd link 463 and the 4th link 464 of illuminating module 44.M current regulator is used for drawing electric current from M+2 link, and regulates the amplitude of the electric current drawing, M=1,2.In the present embodiment, the current amplitude ratio of the first current regulator 4311 and the second current regulator 4312 is essentially 1:2.
The first switch 4321 is electrically connected to respectively the first current regulator 4311 and the second current regulator 4312 with second switch 4322. Switch 4321,4322 is controlled between conducting and not conducting, switches for each.M current regulator, when M switch conduction, draws electric current from M+2 link, and when the not conducting of M switch, from this M+2 link, does not draw electric current.
Drive the voltage of electric power as shown in curve 471, the brightness of illuminating module 44 is as shown in curve 472.The operation of the present embodiment drive circuit 40 can be divided into two stages, is respectively first and second Phase I, II.Below describe this two stages in detail.
First stage I
When driving the voltage magnitude of electric power to be greater than the forward voltage amplitude Vf1 of the first luminescence unit 451 and the second luminescence unit 452, during the summation of Vf2, the first switch 4321 conductings, second switch 4322 not conductings, the first current regulator 4311 is from the 3rd link 463(of illuminating module 44 target link namely) draw electric current, make the first luminescence unit 451 and the second luminescence unit 452 have electric current to flow through (current amplitude is determined by the first current regulator 4311), thereby luminous, and the brightness of illuminating module 44 is proportional to the current amplitude that the first current regulator 4311 determines, and the total number of the light-emitting diode 450 of first luminescence unit 451 and the second luminescence unit 452.
Second stage II
When driving the voltage magnitude of electric power to be greater than the forward voltage amplitude Vf3 of the 3rd luminescence unit 453, but be less than the forward voltage amplitude Vf1 of the first luminescence unit 451 and the second luminescence unit 452, during the summation of Vf2, second switch 4322 conductings, the first switch 4321 not conductings, now, the second current regulator 4312 is from the 4th link 464(of illuminating module 44 target link namely) draw electric current, make the 3rd luminescence unit 453 have electric current to flow through (current amplitude is determined by the second current regulator 4312), thereby luminous, and the brightness of illuminating module 44 is proportional to the current amplitude that the second current regulator 4312 determines, and the number of the light-emitting diode 450 of the 3rd luminescence unit 453.
In the present embodiment, because the current amplitude ratio of the first current regulator 4311 and the second current regulator 4312 is essentially 1:2, and the total number of the light-emitting diode 450 of the first luminescence unit 451 and the second luminescence unit 452 is 2:1 to the ratio of the number of the light-emitting diode 450 of the 3rd luminescence unit 453, so illuminating module 44 is essentially 1:1 in the brightness ratio of first stage and second stage.Certainly, in other embodiments, in when design also can be by adjusting illuminating module 44 the first to the 3rd luminescence unit 451～453 number of included light-emitting diode 450 separately, and the current amplitude ratio of first current regulator 4311 and the second current regulator 4312, making illuminating module 34 is not 1:1 in the brightness ratio of first stage I and second stage II.
The present embodiment drive circuit 40 has the following advantages:
(1), by power factor corrector 42, can improve the power factor of alternating electromotive force.
(2) make illuminating module 44 continue to light, there is no the point of the alternating electromotive force two frequencys multiplication phenomenon of going out, user more can not feel that when long-term use eyes are uncomfortable, and can improve the mean flow rate of illuminating module 44.
The 5th preferred embodiment
Consult Figure 10, the 5th preferred embodiment 40 ' of drive circuit of the present invention is shown in Fig. 8 to the 4th preferred embodiment 40() similar, different places is Current Control module 43 '.
In the present embodiment, Current Control module 43 ' also comprises a diode 434.Diode 434 has an anode that is electrically connected to the second link 462 of illuminating module 44, and a negative electrode that is electrically connected to the 4th link 464 of illuminating module 44.
When driving the voltage magnitude of electric power to be greater than the summation of forward voltage amplitude Vf1, Vf2 of the first luminescence unit 451 and the second luminescence unit 452, the first switch 4321 conductings, second switch 4322 not conductings, the first current regulator 4311 is from the 3rd link 463(of illuminating module 44 target link namely) draw electric current, make the first luminescence unit 451 and the second luminescence unit 452 have electric current to flow through (current amplitude is determined by the first current regulator 4311), thus luminous.
When driving the voltage magnitude of electric power to be greater than the forward voltage amplitude Vf1 of the first luminescence unit 451 and the 3rd luminescence unit 453, both are identical in fact for Vf3(), but be less than the forward voltage amplitude Vf1 of the first luminescence unit 451 and the second luminescence unit 452, during the summation of Vf2, second switch 4322 conductings, the first switch 4321 not conductings, now, the second current regulator 4312 is from the 4th link 464(of illuminating module 44 target link namely) draw electric current, make the first luminescence unit 451 and the 3rd luminescence unit 453 have electric current to flow through (total current amplitude is determined by the second current regulator 4312), thereby luminous.
Claims (10)
1. a drive circuit, for driving an illuminating module, this illuminating module comprises the first luminescence unit to the N luminescence unit, and first link to the N+1 link, M luminescence unit is connected electrically between M link and M+1 link, and each luminescence unit comprises at least one light-emitting diode, N >=2, M=1 ..., N, this drive circuit comprises: a rectifier, from outside, receive an alternating electromotive force, for this alternating electromotive force is carried out to rectification, to produce a rectification electric power; It is characterized in that: this drive circuit also comprises: a power factor corrector, be electrically connected to this rectifier to receive this rectification electric power, be electrically connected to the first link of this illuminating module, for producing one according to this rectification electric power, drive electric power, and export this driving electric power to this illuminating module, and change the current flowing time of this rectifier, to promote the power factor of this alternating electromotive force; An and Current Control module, be electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to the second link to the N+1 link of this illuminating module, for the voltage magnitude that drives electric power according to this, at least one the target link from this second link to the N+1 link draws electric current.
2. drive circuit according to claim 1, it is characterized in that: this Current Control module comprises: the first current regulator to the N current regulator, be electrically connected to respectively the second link to the N+1 link of this illuminating module, M current regulator is used for drawing electric current from this M+1 link, and regulates the amplitude of the electric current drawing; The first switch to the N switch, be electrically connected to respectively this first current regulator to this N current regulator, each switch is controlled to be switched between conducting and not conducting, this M current regulator is when M switch conduction, from this M+1 link, draw electric current, and when this not conducting of M switch, from this M+1 link, do not draw electric current; An and switch control unit, be electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to described switch, for controlling described switch according to the voltage magnitude of this driving electric power, so that a wherein target switch conducting corresponding with this target link, and make not conducting of rest switch.
3. drive circuit according to claim 2, it is characterized in that: N=2, the first luminescence unit of this illuminating module and the second luminescence unit comprise respectively P1 light-emitting diode and P2 light-emitting diode, and the current amplitude ratio of this first current regulator and this second current regulator is (P1+P2): P1.
4. drive circuit according to claim 1, it is characterized in that: N >=3, this Current Control module comprises: the first current regulator to the N current regulator, be electrically connected to respectively the second link to the N+1 link of this illuminating module, M current regulator is used for drawing electric current from this M+1 link, and regulates the amplitude of the electric current drawing; The first switch to the L switch, each switch is electrically connected at least one in described current regulator, and controlledly between conducting and not conducting, switch, this M current regulator is when the voltage magnitude of this corresponding switch conduction and this driving electric power is enough to make this M luminescence unit forward conduction, from this M+1 link, draw electric current, otherwise, from this M+1 link, do not draw electric current, 1<L<N; An and switch control unit, be electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to described switch, for controlling described switch according to the voltage magnitude of this driving electric power, so that a wherein target switch conducting corresponding with this target link, and make not conducting of rest switch.
5. drive circuit according to claim 1, is characterized in that: this power factor corrector is one and fills out paddy power factor corrector.
6. a drive circuit, be used for driving an illuminating module, this illuminating module comprises the first luminescence unit to the three luminescence units, and first link to the four link, this first luminescence unit is connected electrically between this first link and this second link, this second luminescence unit is connected electrically between this second link and the 3rd link, the 3rd luminescence unit is connected electrically between this first link and the 4th link, each luminescence unit comprises at least one light-emitting diode, this drive circuit comprises: a rectifier, from outside, receive an alternating electromotive force, for this alternating electromotive force is carried out to rectification, to produce a rectification electric power, it is characterized in that: this drive circuit also comprises: a power factor corrector, be electrically connected to this rectifier to receive this rectification electric power, be electrically connected to the first link of this illuminating module, for producing one according to this rectification electric power, drive electric power, and export this driving electric power to this illuminating module, and change the current flowing time of this rectifier, to promote the power factor of this alternating electromotive force, an and Current Control module, be electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to the 3rd link and the 4th link of this illuminating module, for the voltage magnitude that drives electric power according to this, a target link from the 3rd link and the 4th link draws electric current.
7. drive circuit according to claim 6, it is characterized in that: this Current Control module comprises: the first current regulator and the second current regulator, be electrically connected to respectively the 3rd link and the 4th link of this illuminating module, M current regulator is for drawing electric current from M+2 link, and regulate the amplitude of the electric current draw, M=1,2; The first switch and second switch, be electrically connected to respectively this first current regulator and this second current regulator, each switch is controlled to be switched between conducting and not conducting, this M current regulator is when M switch conduction, from this M+2 link, draw electric current, and when this not conducting of M switch, from this M+2 link, do not draw electric current; A switch control unit, be electrically connected to this power factor corrector to receive this driving electric power, be electrically connected to described switch, for controlling described switch according to the voltage magnitude of this driving electric power, so that a wherein target switch conducting corresponding with this target link, and make not conducting of rest switch.
8. drive circuit according to claim 7, it is characterized in that: this Current Control module also comprises: a diode, there is an anode that is electrically connected to the second link of this illuminating module, and a negative electrode that is electrically connected to the 4th link of this illuminating module.
9. according to the drive circuit described in claim 7 or 8, it is characterized in that: the current amplitude ratio of this first current regulator and this second current regulator is 1:2.
10. drive circuit according to claim 6, is characterized in that: this power factor corrector is one and fills out paddy power factor corrector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210351983.4A CN103687151A (en) | 2012-09-20 | 2012-09-20 | Drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210351983.4A CN103687151A (en) | 2012-09-20 | 2012-09-20 | Drive circuit |
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| CN103687151A true CN103687151A (en) | 2014-03-26 |
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| CN201210351983.4A Pending CN103687151A (en) | 2012-09-20 | 2012-09-20 | Drive circuit |
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| WO2017063630A1 (en) * | 2015-10-14 | 2017-04-20 | Atlas Elektronik Gmbh | Circuit for operating light-emitting diodes having low flicker and in accordance with standards, and lighting means and lamp |
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Application publication date: 20140326 |