CN102821510A - AC/DC dual-purpose LED drive circuit - Google Patents
AC/DC dual-purpose LED drive circuit Download PDFInfo
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Abstract
An AC/DC LED driving circuit comprises an input power circuit, a buck-boost converter and a pulse width modulation signal controller. The buck-boost converter comprises a switching transistor and a feedback resistor, receives a current signal output by the input power circuit and drives the light-emitting diode by a driving signal. The pulse width modulation signal controller outputs a pulse width modulation signal according to the driving signal to selectively start or close the switching transistor. One end of the feedback resistor is coupled with the light emitting diode, and the floating grounding end of the pulse width modulation signal controller is coupled with the other ends of the switch transistor and the feedback resistor. Therefore, the AC/DC dual-purpose LED driving circuit can dynamically adjust the conduction time of the pulse width modulation signal without an external photoelectric coupler.
Description
Technical field
The present invention relates to a kind of LED driving circuit, particularly a kind of AC/DC LED driving circuit.
Background technology
In recent years, along with the new line of human environmental consciousness, how saving the energy becomes important subject under discussion.In the lighting device aspect because light-emitting diode compares with general light emitting source, light-emitting diode have the life-span long, power consumption is low, advantage such as not fragile, it is human in the important object of research and development with the application facet of living to make light-emitting diode become.
Existing LED driving circuit comprises transformer, PWM integrated circuit, constant-current circuit and feedback circuit.Transformer comprises primary side (primary side) and primary side (secondary side), and feedback circuit comprises sensing resistor and optical coupler.The PWM integrated circuit is electrically coupled to the primary side of transformer, and constant-current circuit is electrically coupled to the primary side of transformer.Feedback circuit is coupled to feedback signal the PWM integrated circuit of primary side according to electric current and optical coupler through sensing resistor.The PWM integrated circuit utilizes the feedback signal of optical coupler reception primary side, with the ON time of adjustment pulse width modulation signal.
Because above-mentioned LED driving circuit need comprise photoelectrical coupler, just can feedback signal be coupled to the PWM integrated circuit, and then the ON time of adjustment PWM integrated circuit institute output pulse width modulating signal.Therefore, existing LED driving circuit has accommodation space and the cost of manufacture problem of higher that component count is more, needs are bigger.
Summary of the invention
The objective of the invention is to propose a kind of AC/DC LED driving circuit, use the existing problem of prior art that solves.
According to an embodiment of the AC/DC LED driving circuit that the present invention disclosed, the AC/DC LED driving circuit comprises input power circuit, a buck-boost converter and a pulse width modulation signal controller.Wherein, buck-boost converter comprises a switching transistor and a feedback resistance.Buck-boost converter receives the current signal that the input power circuit exports and exports a drive signal, and the AC/DC LED driving circuit utilizes drive one light-emitting diode.The pulse width modulation signal controller is exported a pulse width modulation signal according to drive signal, optionally to start or the off switch transistor.
Wherein, an end and the light-emitting diode of feedback resistance couple, and a floating earth end of pulse width modulation signal controller couples the other end of switching transistor and feedback resistance.
In one embodiment, the input power circuit comprises an ac signal which, one first filter and a bridge rectifier.Ac signal which is exported AC signal to the first filter, the noise in the first filter filtering AC signal.Bridge rectifier receives AC signal and the output current signal of first filter of flowing through.
In one embodiment, the input power circuit is a direct current signal source.
According to another embodiment of the AC/DC LED driving circuit that the present invention disclosed, the AC/DC LED driving circuit is applicable to and drives a light-emitting diode.The AC/DC LED driving circuit comprises input power circuit, a buck-boost converter and a pulse width modulation signal controller.Wherein, buck-boost converter comprises a switching transistor, a feedback resistance, a low pass filter and a free-wheel diode (Freewheeling Diode).One end of low pass filter coupled free-wheel diode, the other end and the light-emitting diode of free-wheel diode couple.One floating earth end of pulse width modulation signal controller couples switching transistor and low pass filter, and two ends of feedback resistance couple floating earth end and low pass filter respectively.Buck-boost converter receives the current signal that the input power circuit exports and exports a drive signal, and the AC/DC LED driving circuit utilizes the drive light-emitting diode.The pulse width modulation signal controller is exported a pulse width modulation signal according to a feedback signal of the low pass filter of flowing through, optionally to start or the off switch transistor.
According to the AC/DC LED driving circuit that the present invention disclosed, be applicable to the driven for emitting lights diode.Can make the AC/DC LED driving circuit not need external photoelectrical coupler can dynamically adjust the ON time of pulse width modulation signal through the design of buck-boost converter and pulse width modulation signal controller floating earth.Wherein, when the input power circuit comprises ac signal which, can promote the power factor of the high merit of AC/DC because of LED driving circuit, power factor is meant the ratio between effective power and the apparent power (apparent power).When the input power circuit was dc signal source, no matter the voltage of dc signal source is greater than or less than the voltage (voltage of second electric capacity) of output, the electric current of driven for emitting lights diode (drive signal) was a set point.No matter the input power circuit comprises ac signal which or is dc signal source; All can be through the flow through high-frequency signal of switching signal of free-wheel diode of low pass filter filters out, make pulse width modulation signal controller receiving feedback signals and export corresponding pulse width modulation signal.
Describe the present invention below in conjunction with accompanying drawing and specific embodiment, but not as to qualification of the present invention.
Description of drawings
Fig. 1 is the embodiment circuit block diagram according to the AC/DC LED driving circuit that the present invention disclosed;
Fig. 2 is the first embodiment electrical block diagram according to Fig. 1;
Fig. 3 is the error enlarged ends according to Fig. 2, an embodiment circuit framework sketch map of compensation end, feedback end and control end;
Fig. 4 A is the signal waveform sequential chart according to an embodiment AC signal of the circuit framework of Fig. 2;
Fig. 4 B is the signal waveform sequential chart according to an embodiment current signal of the circuit framework of Fig. 2;
Fig. 4 C is the signal waveform sequential chart according to an embodiment first electric current of the circuit framework of Fig. 2;
Fig. 4 D is the signal waveform sequential chart according to an embodiment pulse width modulation signal of the circuit framework of Fig. 2;
Fig. 4 E is the signal waveform sequential chart according to an embodiment drive signal of the circuit framework of Fig. 2;
Fig. 5 is the second embodiment electrical block diagram according to Fig. 1;
Fig. 6 is the embodiment electrical block diagram according to the AC/DC LED driving circuit that the present invention disclosed;
Fig. 7 A is the waveform sequential chart according to an embodiment current signal of the circuit framework of Fig. 6;
Fig. 7 B is the waveform sequential chart according to an embodiment first electric current of the circuit framework of Fig. 6;
Fig. 7 C is the waveform sequential chart according to an embodiment pulse width modulation signal of the circuit framework of Fig. 6;
Fig. 7 D is the waveform sequential chart according to an embodiment drive signal of the circuit framework of Fig. 6;
Fig. 7 E is the waveform sequential chart according to an embodiment switching signal of the circuit framework of Fig. 6;
Fig. 7 F is the waveform sequential chart according to an embodiment feedback signal of the circuit framework of Fig. 6.
Wherein, Reference numeral
10 input power circuits
20 error amplifying units
22 comparators
24 sawtooth generators
26 computing resistance
30 switching transistors
32 feedback resistances
42 free-wheel diodes
44 low pass filters
46 second filter capacitors
48 filter resistances
50 light-emitting diodes
70 starting resistances
72 second filter capacitors
74 compensators
76 the 3rd filter capacitors
80 filter inductances
82 first filter capacitors
90 first inductance
92 first electric capacity
94 second electric capacity
96 first diodes
98 second diodes
99 sensing resistor
100 AC/DC LED driving circuits
102 ac signal whiches
104 first filters
106 bridge rectifiers
108 buck-boost converters
110 pulse width modulation signal controllers
112 control power subsystems
Embodiment
Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are done concrete description:
Please, be an embodiment circuit block diagram according to the AC/DC LED driving circuit that the present invention disclosed with reference to Fig. 1.AC/DC LED driving circuit 100 is applicable to and drives five light-emitting diodes 50.In the present embodiment, the quantity of light-emitting diode 50 can be but is not limited to five and light-emitting diode 50 series systems capable of using and interconnects, but present embodiment is not in order to limit the present invention.That is to say that the quantity of light-emitting diode 50 also can be ten and light-emitting diode 50 parallel waies capable of using and interconnects, and can adjust according to actual demand.
AC/DC LED driving circuit 100 comprises input power circuit 10, buck-boost converter (Buck-Boost Converter) 108 and pulse width modulation signal controller 110.Wherein, Buck-boost converter 108 comprises switching transistor 30 and feedback resistance 32; One of them couples one end of feedback resistance 32 and five light-emitting diodes 50, and the floating earth end GNDF of pulse width modulation signal controller 110 couples the other end of switching transistor 30 and feedback resistance 32.
Please, be the first embodiment electrical block diagram according to Fig. 1 with reference to Fig. 2.In the present embodiment, input power circuit 10 can comprise ac signal which 102, first filter 104 and bridge rectifier 106.Wherein, first filter 104 can include but not limited to the filter inductance 80 and first filter capacitor 82, and filter inductance 80 can be connected with ac signal which 102, and first filter capacitor 82 can be parallelly connected with ac signal which 102.Switching transistor 30 can be but is not limited to N type passage metal-oxide half field effect transistor (N-channel Metal-Oxide Semiconductor Field Effect Transistor; NMOSFET); That is to say; Switching transistor 30 also can be bipolar transistor (Bipolar Junction Transistor, BJT) or P type passage metal-oxide half field effect transistor (P-channel Metal-Oxide Semiconductor Field Effect Transistor, PMOSFET).Pulse width modulation signal controller 110 can include but not limited to floating earth end GNDF, feedback end V
FBWith control end V
GOne end and the light-emitting diode 50 of feedback resistance 32 couple, and floating earth end GNDF couples the other end of switching transistor 30 (being the source S of N type passage metal-oxide half field effect transistor) and feedback resistance 32.Control end V
GCouple the grid G of N type passage metal-oxide half field effect transistor, the drain D of N type passage metal-oxide half field effect transistor couples bridge rectifier 106.
Ac signal which 102 is output AC signal I
ACTo first filter, 104, the first filters, 104 filtering AC signal I
ACIn noise.Bridge rectifier 106 is the AC signal I that receive first filter 104 of flowing through
ACAnd output current signal I
C, buck-boost converter 108 is received current signal I
CAnd output drive signal I
O, AC/DC LED driving circuit 100 is to utilize drive signal I
ODrive five light-emitting diodes 50.Pulse width modulation signal controller 110 is according to drive signal I
OOutput pulse width modulating signal V
PWM, optionally to start or off switch transistor 30 (being N type passage metal-oxide half field effect transistor).Holding the back about AC/DC LED driving circuit 100 detailed operation workflows describes.
In addition, AC/DC LED driving circuit 100 also comprises control power subsystem 112, and control power subsystem 112 gives pulse width modulation signal controller 110 in order to power supply.Wherein, control power subsystem 112 can include but not limited to starting resistance 70, second filter capacitor 72 and first diode 96.One end of starting resistance 70 couples bridge rectifier 106, and starting resistance 70 other ends couple circuit voltage V
DDOne end of second filter capacitor 72 couples circuit voltage V
DD, the other end of second filter capacitor 72 couples floating earth end GNDF, and the output of first diode 96 couples circuit voltage V
DDWherein, circuit voltage V
DDIt is operating voltage for pulse width modulation signal controller 110.
As circuit voltage V
DDWhen not setting up current potential as yet, 106 output current signal I of bridge rectifier
CCan charge through 70 pairs second filter capacitors 72 of starting resistance.The operating voltage that reaches pulse width modulation signal controller 110 when the voltage of second filter capacitor 72 (is circuit voltage V
DD) time, pulse width modulation signal controller 110 can begin output pulse width modulating signal V
PWM, optionally to start or off switch transistor 30 (being N type passage metal-oxide half field effect transistor).After control power subsystem 112 began to be powered at pulse width modulation signal controller 110, control power subsystem 112 can further be powered at pulse width modulation signal controller 110 through first diode 96.Buck-boost converter 108 can comprise first inductance 90, second electric capacity 94, second diode 98 and sensing resistor 99 in addition.One end ground connection of first inductance 90 also couples the input of first diode 96 and second diode 98, and the other end of first inductance 90 couples bridge rectifier 106.The output of second diode 98 couples an end of second electric capacity 94, and the other end of second electric capacity 94 couples floating earth end GNDF.One end of sensing resistor 99 couples floating earth end GNDF.Wherein, sensing resistor 99 is in order to flow through first electric current I of first inductance 90 of detection
L1, and limit first electric current I
L1Current value, with the protection switch transistor 30 and second diode 98.
In the present embodiment, buck-boost converter 108 also can comprise an end ground connection of first electric capacity, 92, the first electric capacity 92, and the other end couples the drain D of N type passage metal-oxide half field effect transistor.Wherein, first electric capacity 92 can be in order to filtering current signal I
CIn noise, but present embodiment is not in order to limit the present invention.
Pulse width modulation signal controller 110 can comprise compensator 74, the 3rd filter capacitor 76, error enlarged ends V in addition
EAO, compensation end V
Comp, light modulation end V
DIMWith protection end V
CSOne end of compensator 74 couples error enlarged ends V
EAO, the other end of compensator 74 couples compensation end V
CompOne end of the 3rd filter capacitor 76 couples light modulation end V
DIM, the other end of the 3rd filter capacitor 76 couples floating earth end GNDF.Protection end V
CSCouple the other end of first inductance 90 and sensing resistor 99.
In addition, please with reference to Fig. 3, be the error enlarged ends of foundation 2 figure, an embodiment circuit framework sketch map of compensation end, feedback end and control end.Pulse width modulation signal controller 110 also can comprise error amplifying unit 20, comparator 22, sawtooth generator 24 and computing resistance 26.Wherein, the positive input terminal of error amplifying unit 20 couples reference voltage V
Ref2, the negative input end of error amplifying unit 20 couples compensation end V
CompWith an end of computing resistance 26, the other end of computing resistance 26 couples feedback end V
FB, the output of error amplifying unit 20 couples the positive input terminal of comparator 22, and sawtooth generator 24 couples the negative input end of comparator 22, and the output of comparator 22 couples control end V
G
In more detail; Please with reference to Fig. 2, Fig. 3, Fig. 4 A, Fig. 4 B, Fig. 4 C, Fig. 4 D and Fig. 4 E, Fig. 4 A to Fig. 4 E is respectively the signal waveform sequential chart according to an embodiment AC signal, current signal, first electric current, pulse width modulation signal and the drive signal of the circuit framework of Fig. 2.Ac signal which 102 is output AC signal I
ACTo first filter, 104, the first filters, 104 filtering AC signal I
ACIn noise.Bridge rectifier 106 is the AC signal I that receive first filter 104 of flowing through
ACAnd output current signal I
CTo buck-boost converter 108, buck-boost converter 108 received current signal I
CBack output drive signal I
O, to drive five light-emitting diodes 50.Pulse width modulation signal controller 110 is through feedback end V
FBReceive drive signal I
OAfter, can with error enlarged ends V
EAOAnd compensation end V
CompThe signal that is received carries out error through computing resistance 26, error amplifying unit 20 and compensator 74 and amplifies operation program and output error amplifying signal V
Err, and then compare program through sawtooth generator 24 and comparator 22, with output pulse width modulating signal V
PWM(V
PWMCycle be T
s).
As pulse width modulation signal V
PWMIn high potential (is V
PWMIn time t
OnIn) time, because switching transistor 30 is activated first electric current I of feasible first inductance 90 of flowing through
L1Linear and the proportional relation with the time.As pulse width modulation signal V
PWMIn electronegative potential and in time t
DSCWhen interior, switching transistor 30 is closed, 98 conductings of second diode, and second electric capacity 94 and light-emitting diode 50, first electric current I of feasible first inductance 90 of flowing through are given in 90 power supplies of first inductance
L1Linear and the inverse relation with the time.As pulse width modulation signal V
PWMIn electronegative potential and in time t
OffWhen interior, switching transistor 30 keep shut state and first electric current I of first inductance 90 of flowing through
L1Make zero, make second diode 98 be closed.Therefore, protection end V
CSThe signal that is received (first electric current I of first inductance 90 of promptly flowing through
L1) can be but be not limited to non-continuous mode (Discontinuous Current Mode, DCM).
In the present embodiment, pulse width modulation signal V
PWMHas fixed cycle T
s(that is to say pulse width modulation signal V
PWMHave fixed frequency), but present embodiment is not in order to limit the present invention.In other words, pulse width modulation signal V
PWMFrequency also can be underrange.Wherein, pulse width modulation signal V
PWMFrequency can be relevant with the frequency of sawtooth generator 24.
Please, be the second embodiment electrical block diagram according to Fig. 1 with reference to Fig. 5.In the present embodiment, input power circuit 10 can be dc signal source.Buck-boost converter 108 is to receive the current signal I that dc signal source is exported
CAnd output drive signal I
O, AC/DC LED driving circuit 100 is to utilize drive signal I
ODrive five light-emitting diodes 50.Pulse width modulation signal controller 110 is according to drive signal I
OOutput pulse width modulating signal V
PWM, optionally to start or off switch transistor 30.How to pass through drive signal I about pulse width modulation signal controller 110
OOutput pulse width modulating signal V
PWM, and then optionally start or the description of off switch transistor 30 identical with the described embodiment of Fig. 2, repeat no more in this.
Please, be an embodiment electrical block diagram according to the AC/DC LED driving circuit that the present invention disclosed with reference to Fig. 6.In the present embodiment, AC/DC LED driving circuit 100 is applicable to and drives five light-emitting diodes 50.In the present embodiment, the quantity of light-emitting diode 50 can be but is not limited to five and light-emitting diode 50 series systems capable of using and interconnects, but present embodiment is not in order to limit the present invention.For example, the quantity of light-emitting diode 50 also can be ten and light-emitting diode 50 parallel waies capable of using and interconnects, and can adjust according to actual demand.
AC/DC LED driving circuit 100 comprises input power circuit 10, buck-boost converter (Buck-Boost Converter) 108 and pulse width modulation signal controller 110.In the present embodiment, input power circuit 10 can be but is not limited to the input power circuit 10 of Fig. 2 or Fig. 5.Buck-boost converter 108 is except the switching transistor 30 of the buck-boost converter 108 that comprises Fig. 2, feedback resistance 32, first inductance 90, second electric capacity 94, sensing resistor 99 and first electric capacity 92, and buck-boost converter 108 also comprises low pass filter 44 and free-wheel diode 42.Wherein, low pass filter 44 couples an end of free-wheel diode 42, and one of them couples the other end of free-wheel diode 42 and five light-emitting diodes 50.The floating earth end GNDF of pulse width modulation signal controller 110 couples switching transistor 30 and low pass filter 44, and two ends of feedback resistance 32 coupling are respectively taken off floating earth end GNDF and low pass filter 44.
In the present embodiment; Low pass filter 44 can include but not limited to second filter capacitor 46 and filter resistance 48; One end of second filter capacitor 46 and floating earth end GNDF couple; One end of the other end of second filter capacitor 46 and filter resistance 48 couples, and the other end of filter resistance 48 couples feedback resistance 32 and free-wheel diode 42.
In more detail; Please with reference to Fig. 3, Fig. 6, Fig. 7 A, Fig. 7 B, Fig. 7 C, Fig. 7 D, Fig. 7 E and Fig. 7 F, Fig. 7 A to Fig. 7 F is the waveform sequential chart that is respectively according to an embodiment current signal, first electric current, pulse width modulation signal, drive signal, switching signal and the feedback signal of the circuit framework of Fig. 6.Wherein, input power circuit 10 is that the input power circuit 10 with Fig. 2 be that example is described, but is not in order to qualification the present invention.Input power circuit 10 output current signal I
C, buck-boost converter 108 is received current signal I
CAnd output drive signal I
OTo drive five light-emitting diodes 50.When the voltage of second filter capacitor 72 does not reach the operating voltage of pulse width modulation signal controller 110,10 output current signal I of input power circuit
CCan charge through 70 pairs second filter capacitors 72 of starting resistance.When the voltage of second filter capacitor 72 reaches the operating voltage of pulse width modulation signal controller 110, pulse width modulation signal controller 110 feedback end V capable of using
FBThe signal that is received (is feedback signal V
B) and error enlarged ends V
EAOAnd compensation end V
CompThe signal that is received carries out error through computing resistance 26, error amplifying unit 20 and compensator 74 and amplifies operation program and output error amplifying signal V
Err, and then compare program through sawtooth generator 24 and comparator 22, with output pulse width modulating signal V
PWM(V
PWMCycle be T
s).Optionally to start or off switch transistor 30 (being N type passage metal-oxide half field effect transistor).After control power subsystem 112 began to be powered at pulse width modulation signal controller 110, control power subsystem 112 can further be powered at pulse width modulation signal controller 110 through first diode 96.
As pulse width modulation signal V
PWMIn high potential (is V
PWMIn time t
OnIn) time, because switching transistor 30 is activated first electric current I of feasible first inductance 90 of flowing through
L1Linear and the proportional relation with the time.As pulse width modulation signal V
PWMIn electronegative potential and in time t
DSCWhen interior, switching transistor 30 is closed, free-wheel diode 42 conductings, and second electric capacity 94 and light-emitting diode 50, first electric current I of feasible first inductance 90 of flowing through are given in 90 power supplies of first inductance
L1Linear and the inverse relation with the time, and the switching signal I of the free-wheel diode 42 of flowing through
DThe also linear and inverse relation with the time.As pulse width modulation signal V
PWMIn electronegative potential and in time t
OffWhen interior, switching transistor 30 keep shut state and first electric current I of first inductance 90 of flowing through
L1Make zero, make free-wheel diode 42 be closed.Therefore, protection end V
CSThe signal that is received (first electric current I of first inductance 90 of promptly flowing through
L1) can be but be not limited to non-continuous mode (Discontinuous Current Mode, DCM).
In the present embodiment, pulse width modulation signal V
PWMHas fixed cycle T
s(that is to say pulse width modulation signal V
PWMHave fixed frequency), but present embodiment is not in order to limit the present invention.In other words, pulse width modulation signal V
PWMFrequency also can be underrange.Wherein, pulse width modulation signal V
PWMFrequency can be relevant with the frequency of sawtooth generator 24.
According to the AC/DC LED driving circuit that the present invention disclosed, be applicable to the driven for emitting lights diode.Can make the AC/DC LED driving circuit not need external photoelectrical coupler can dynamically adjust the ON time of pulse width modulation signal through the design of buck-boost converter and pulse width modulation signal controller floating earth.Wherein, the ON time of pulse width modulation signal is relevant with the drive signal size of driven for emitting lights diode.When the input power circuit comprises ac signal which, can promote the power factor of AC/DC LED driving circuit, wherein power factor is meant the ratio between effective power and the apparent power (apparent power).When the input power circuit was dc signal source, no matter the voltage of dc signal source is greater than or less than the voltage (voltage of second electric capacity) of output, the electric current of driven for emitting lights diode (drive signal) was a set point.No matter the input power circuit comprises ac signal which or is dc signal source; All can be through the flow through high-frequency signal of switching signal of free-wheel diode of low pass filter filters out, make pulse width modulation signal controller receiving feedback signals and export corresponding pulse width modulation signal.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (16)
1. an AC/DC LED driving circuit is applicable to drive a light-emitting diode, it is characterized in that, comprising:
One input power circuit is in order to export a current signal;
One buck-boost converter; Receive this current signal and export a drive signal; This AC/DC LED driving circuit utilizes this light-emitting diode of this drive; Wherein, this buck-boost converter comprises a switching transistor and a feedback resistance, and an end and this light-emitting diode of this feedback resistance couple; And
One pulse width modulation signal controller; Export a pulse width modulation signal according to this drive signal; Optionally to start or to close this switching transistor, wherein, a floating earth end of this pulse width modulation signal controller couples the other end of this switching transistor and this feedback resistance.
2. AC/DC LED driving circuit according to claim 1 is characterized in that, this input power circuit comprises:
One ac signal which is exported an AC signal;
One first filter, the noise in this AC signal of filtering; And
One bridge rectifier receives this AC signal of this first filter of flowing through and exports this current signal.
3. AC/DC LED driving circuit according to claim 1 is characterized in that, this input power circuit is a direct current signal source.
4. AC/DC LED driving circuit according to claim 1 is characterized in that, the frequency of this pulse width modulation signal is not a definite value.
5. AC/DC LED driving circuit according to claim 1 is characterized in that, the frequency of this pulse width modulation signal is a definite value.
6. AC/DC LED driving circuit according to claim 1; It is characterized in that; This pulse width modulation signal controller also comprises a feedback end and a control end, and this feedback end is in order to receive this direct current signal, and this control end is in order to export this pulse width modulation signal.
7. AC/DC LED driving circuit according to claim 1 is characterized in that, this pulse width modulation signal controller is the control circuit of a voltage mode.
8. AC/DC LED driving circuit according to claim 1 is characterized in that, this buck-boost converter also comprises one first inductance, and one first electric current of this first inductance of flowing through is a non-continuous mode.
9. AC/DC LED driving circuit is applicable to drive a light-emitting diode, its characteristic in, comprising:
One input power circuit is in order to export a current signal;
One buck-boost converter; Receive this current signal and export a drive signal; This AC/DC LED driving circuit utilizes this light-emitting diode of this drive, and wherein, this buck-boost converter comprises a switching transistor, a feedback resistance, a low pass filter and a free-wheel diode; One end of this this free-wheel diode of low pass filter coupled, the other end of this free-wheel diode and this light-emitting diode couple; And
One pulse width modulation signal controller; Feedback signal according to this low pass filter of flowing through is exported a pulse width modulation signal; Optionally to start or to close this switching transistor; Wherein, a floating earth end of this pulse width modulation signal controller couples this switching transistor and this low pass filter, and two ends of this feedback resistance couple this floating earth end and this low pass filter respectively.
10. AC/DC LED driving circuit according to claim 9 is characterized in that, this input power circuit comprises:
One ac signal which is exported an AC signal;
One first filter, the noise in this AC signal of filtering; And
One bridge rectifier receives this AC signal of this first filter of flowing through and exports this current signal.
11. AC/DC LED driving circuit according to claim 9 is characterized in that this input power circuit is a direct current signal source.
12. AC/DC LED driving circuit according to claim 9 is characterized in that, the frequency of this pulse width modulation signal is a underrange.
13. AC/DC LED driving circuit according to claim 9 is characterized in that, the frequency of this pulse width modulation signal is a definite value.
14. AC/DC LED driving circuit according to claim 9; It is characterized in that; This pulse width modulation signal controller also comprises a feedback end and a control end, and this feedback end is in order to receive this feedback signal, and this control end is in order to export this pulse width modulation signal.
15. AC/DC LED driving circuit according to claim 9 is characterized in that, this pulse width modulation signal controller is the control circuit of a voltage mode.
16. AC/DC LED driving circuit according to claim 9 is characterized in that, this buck-boost converter also comprises one first inductance, and one first electric current of this first inductance of flowing through is a non-continuous mode.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW100120049 | 2011-06-08 | ||
| TW100120049 | 2011-06-08 | ||
| TW100137341 | 2011-10-14 | ||
| TW100137341A TWI446820B (en) | 2011-06-08 | 2011-10-14 | Light emitting diode driving circuit for ac or dc power source |
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| Publication Number | Publication Date |
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| CN102821510A true CN102821510A (en) | 2012-12-12 |
| CN102821510B CN102821510B (en) | 2014-11-05 |
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| CN201110327290.7A Active CN102821510B (en) | 2011-06-08 | 2011-10-20 | AC/DC dual-purpose LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716816A (en) * | 2013-12-17 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Power conversion device, isolation driving circuit and isolation driving method |
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| US20090261748A1 (en) * | 2008-04-15 | 2009-10-22 | Mckinney Steven | Modified dimming LED driver |
| US20100118572A1 (en) * | 2008-11-12 | 2010-05-13 | Alexander Mednik | Led driver with low harmonic distortion of input ac current and methods of controlling the same |
| EP2228787A2 (en) * | 2009-03-13 | 2010-09-15 | Samsung Electronics Co., Ltd. | Light source driving apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050151518A1 (en) * | 2004-01-08 | 2005-07-14 | Schneiker Henry D. | Regulated open-loop constant-power power supply |
| JP2009533015A (en) * | 2006-04-03 | 2009-09-10 | アレグロ・マイクロシステムズ・インコーポレーテッド | Method and apparatus for switching regulator control |
| US20090261748A1 (en) * | 2008-04-15 | 2009-10-22 | Mckinney Steven | Modified dimming LED driver |
| US20100118572A1 (en) * | 2008-11-12 | 2010-05-13 | Alexander Mednik | Led driver with low harmonic distortion of input ac current and methods of controlling the same |
| EP2228787A2 (en) * | 2009-03-13 | 2010-09-15 | Samsung Electronics Co., Ltd. | Light source driving apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104716816A (en) * | 2013-12-17 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Power conversion device, isolation driving circuit and isolation driving method |
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| CN102821510B (en) | 2014-11-05 |
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