CN103298183A - Light-emitting diode driving circuit - Google Patents
Light-emitting diode driving circuit Download PDFInfo
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- CN103298183A CN103298183A CN2012100449115A CN201210044911A CN103298183A CN 103298183 A CN103298183 A CN 103298183A CN 2012100449115 A CN2012100449115 A CN 2012100449115A CN 201210044911 A CN201210044911 A CN 201210044911A CN 103298183 A CN103298183 A CN 103298183A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
A light-emitting diode driving circuit is used for driving a light-emitting diode module. The light-emitting diode driving circuit comprises a voltage-raising circuit, a controller, an output resistor and an output current adjusting circuit. The voltage-raising circuit raises an input voltage to generate an output voltage to drive the light-emitting diode module. The controller controls operation of the voltage-raising circuit according to a starting signal and provides an output current to the light-emitting diode module. The output resistor is electrically coupled with a light-emitting diode current set connecting foot, so that the output current of the controller and the resistance value of the output resistor are in inverse proportion. The output current adjusting circuit is electrically coupled with the output resistor and increases the resistance value of the output resistor when the starting signal is received, so that the output current is lowered, and when preset time is over, the resistance value of the output resistor is lowered, so that the output current is increased. Accordingly, the effect and the purpose that the output current is adjusted flexibly are achieved.
Description
Technical field
The present invention relates to a kind of drive circuit, particularly relate to a kind of LED driving circuit.
Background technology
Referring to shown in Figure 1, a kind of LED driving circuit 1 in the past, in order to drive a light-emitting diode (LED) module 10 of being formed by plural number light-emitting diode D1n～D4n, it comprises an input voltage vin is boosted, to produce the booster circuit 11 that an output voltage V out drives light-emitting diode (LED) module 10, an and controller 12, it starts 11 runnings of signal En control booster circuit according to one, and set the output current Iout offer light-emitting diode (LED) module 10 and (comprise Iout1～Iout4), and the value of output current Iout is to be inversely proportional to the resistance of electric coupling at the output resistance Ro of the led current setting pin Iout of controller 12 set, that is Iout=C/Ro, wherein C is a constant, therefore output current Iout is certain value, and the load current value of light-emitting diode (LED) module 10 normally.
Therefore, referring to shown in Figure 2, LED driving circuit is when starting at the beginning, except needs provide specified output current Iout to the light-emitting diode (LED) module 10, also to provide enough electric currents to charge to the output capacitance C2 in the booster circuit 11, to reach the effect that allows output voltage boost, therefore, the input current Ip1 of booster circuit of flowing through is very big, cause the inductance L in the booster circuit 11, transistor switch Q and diode D must bear very big rush of current, therefore booster circuit 11 must adopt rated current (current-limiting points) specification to be equivalent to the highest input current Iocp or higher inductance, transistor switch and diode assembly, cause circuit cost to improve, and cause meaningless power consumption.
Summary of the invention
But the drive circuit of the light-emitting diode of the output current when the object of the present invention is to provide a kind of elasticity adjustment to start.
The drive circuit of light-emitting diode of the present invention drives a light-emitting diode (LED) module that comprises plural light-emitting diode in order to start signal according to one.This LED driving circuit comprises:
One booster circuit boosts to produce an output voltage and an output current drives this light-emitting diode (LED) module to an input voltage;
One controller operates in order to receive this startup signal, and can regulate the output current of this booster circuit;
One output resistance, electric coupling is set pin in a led current of this controller, and this controller is regulated the output current of this booster circuit according to this output resistance, and the size of this output current and the resistance of this output resistance are inversely proportional to; And
One output current is adjusted circuit, with this output resistance electric coupling, and when receiving this startup signal, increases the resistance of this output resistance, and this output current is reduced, and when finishing to a late Preset Time, reduces the resistance of this output resistance, and this output current is increased.
Preferably, this output resistance comprises one first output resistance and one second output resistance, the led current of this first output resistance, one this controller of end electric coupling is set pin, other end ground connection, one end of this second output resistance is connected with an end of this first output resistance, this output current is adjusted circuit and is comprised first switch that is serially connected between the other end of the other end of this first output resistance and this second output resistance, one end connects this input voltage, the other end connects first resistance of this first switch, reach this first switch conduction whether delay circuit of control, when this delay circuit is received this startup signal, make this not conducting of first switch, make this first output resistance not in parallel with this second output resistance, make this output current reduce, when finishing to late this Preset Time, this delay circuit makes this first switch conduction, makes this first output resistance in parallel with this second output resistance, makes this output current increase.
Preferably, this delay circuit comprises an end and this first switch are connected to control this first switch conduction whether second switch, one first comparator and one is connected the output of this first comparator and resistance capacitance (RC) circuit between this second switch, this first comparator is accepted a reference signal and the input of this startup signal, when this starts signal reference position greater than this reference signal, this first comparator is exported a high voltage and is controlled this second switch conducting via this resistor capacitor circuit, and make this not conducting of first switch, up to this high voltage discharges this Preset Time through this resistor capacitor circuit after, control this not conducting of second switch, make this input voltage via this this first switch of first resistance conducting.
Preferably, this delay circuit also comprises one second comparator and the 3rd switch that is connected with the output of this second comparator, whether itself and this second switch electric coupling is to control this second switch conducting, one input of this second comparator is connected with this controller, another input is accepted a reference signal, and this controller is also detected this output voltage and whether is reached a preset value, if, then output is controlled this second comparator greater than the control signal of this reference signal and is exported a high voltage and control the 3rd switch conduction in the position surely, makes this not conducting of second switch of control.
In addition, above-mentioned output current is adjusted the replaceable one-tenth of circuit and is comprised first switch that is serially connected between the other end of the other end of this first output resistance and this second output resistance, one end connects this input voltage, the other end connects one first resistance of this first switch, one this first switch conduction whether second switch of control, reach this second switch conducting whether comparator of control, one input of this comparator is connected with this controller, another input is accepted a reference signal, and when this controller is received this startup signal, output is a control signal greater than this reference signal surely, control this second comparator and export this second switch of high levle voltage turn-on, make this not conducting of first switch of control, make this first output resistance not in parallel with this second output resistance, and reduce this output current, detect this output voltage up to this controller and reach a preset value, then output is controlled this second comparator less than the control signal of this reference signal and is exported this not conducting of second switch of a low level voltage control in the position surely, then this input voltage is via this this first switch of first resistance conducting, make this first output resistance in parallel with this second output resistance, and increase this output current.
Beneficial effect of the present invention is: the initial start up phase that does not reach predetermined voltage at the output voltage of booster circuit as yet, reduce the output current that offers light-emitting diode (LED) module earlier, make most input current offer the output capacitance charging, after output voltage can be continued in Preset Time and boost fast reach predetermined voltage, increase the output current that offers light-emitting diode (LED) module again, reduce electric current whereby to the inductance in the booster circuit, switch, the impact of assembly such as diode and output capacitance, make booster circuit can adopt the inductance of low rated current specification, switch, diode and output capacitance are made, and the manufacturing cost of reduction circuit, and the consumption of minimizing electric energy.
Description of drawings
Fig. 1 is a kind of LED driving circuit in the past;
Fig. 2 is output voltage and the output current contrast schematic diagram of the LED driving circuit of Fig. 1;
Fig. 3 is first preferred embodiment of LED driving circuit of the present invention;
Fig. 4 is output voltage and the output current contrast schematic diagram of the LED driving circuit of first embodiment;
Fig. 5 is the detailed circuit diagram of the delay circuit of first embodiment;
Fig. 6 is second preferred embodiment of LED driving circuit of the present invention;
Fig. 7 is the detailed circuit diagram of the delay circuit of second embodiment;
Fig. 8 is the 3rd preferred embodiment of LED driving circuit of the present invention.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
Referring to shown in Figure 3, the drive circuit of light-emitting diode of the present invention comprises the plural light-emitting diode (light-emitting diode (LED) module 30 of D11～D1n, D21～D2n, D31～D3n, D41～D4n), and first preferred embodiment of the present invention comprises that a booster circuit 31, a controller 32, an output resistance Ro and an output current adjust circuit 33 in order to driving.
Output resistance Ro electric coupling is set pin Iout set in a led current of controller 32, and the value of the output current Iout that controller 32 sets and the resistance of output resistance Ro are inversely proportional to, that is Iout=C/Ro, and wherein C is a constant.
Output current is adjusted circuit 33 and output resistance Ro electric coupling, and when receiving startup signal En, increase the resistance of output resistance Ro, make output current Iout reduce (Iout=Ip2), as shown in Figure 4, when finishing to a late Preset Time, reduce the resistance of output resistance Ro, make output current Iout increase to the rated value (being Iout=Ip3) of light-emitting diode (LED) module 30.Whereby, when the drive circuit of light-emitting diode has just started, reduce the output current that offers light-emitting diode (LED) module 30 earlier, make most input current Lin be able to output capacitance C2 is charged, after output voltage V out can be continued in Preset Time and boost fast reach predetermined voltage, increase output current Iout again to the rated current Ip3 of light-emitting diode (LED) module 30, allow light-emitting diode (LED) module 30 be maintained certain brightness, and the inductance L of the booster circuit 31 of flowing through when just having started owing to circuit, switch Q, the magnitude of current of diode D and output capacitance C2 reduces, therefore, can adopt the inductance L of low rated current specification, switch Q, diode D and output capacitance C2, and the manufacturing cost of reduction circuit, and the consumption of minimizing electric energy.
Specifically, the output resistance Ro of present embodiment comprises one first output resistance Ro1 and one second output resistance Ro2, the led current of the end electric coupling controller 32 of the first output resistance Ro1 is set pin Iout set, other end ground connection, the end of the second output resistance Ro2 and the led current of controller 32 are set pin Iout set electric coupling, and with the end electric coupling of the first output resistance Ro1.Output current is adjusted the first switch Q1 between the other end that circuit 33 comprises an other end that is serially connected in the first output resistance Ro1 and the second output resistance Ro2, one end connects input voltage vin, the other end connects first resistance R 1 of the first switch Q1, an and the control first switch Q1 conducting whether delay circuit 34, delay circuit 34 is received when starting signal En, control the first not conducting of switch Q1, the second output resistance Ro2 is opened circuit and not in parallel with the first output resistance Ro1, then the resistance of output resistance Ro increases (being the Ro=first output resistance Ro1), make output current Iout reduce, when finishing to late Preset Time, delay circuit 34 makes the first switch Q1 conducting, make the first output resistance Ro1 in parallel with the second output resistance Ro2, then the resistance of output resistance Ro reduces (being Ro=Ro1//Ro2), makes output current Iout increase.
Or rather, as shown in Figure 5, delay circuit 34 comprises that an end is connected with the first switch Q1, with control the first switch Q1 conducting whether second switch Q2, one first comparator 341 and is connected the output of first comparator 341 and resistance capacitance (hereinafter to be referred as the RC) circuit 342 between the second switch Q2.
Again referring to Fig. 6 and shown in Figure 7, in second preferred embodiment of the drive circuit of light-emitting diode of the present invention, delay circuit 34 ' also comprises one second comparator 343, and one be connected with the output of second comparator 343, and be subjected to voltage-controlled the 3rd switch Q3 of output, itself and second switch Q2 electric coupling, with control second switch Q2 conducting whether.One input of second comparator 343 is connected with controller 32, and another input is accepted a reference signal Vref (2.5V).In the present embodiment, in the process that output voltage V out continues to boost, output voltage V out via a proportioner 35 suitably decay (for example decaying to 5V by 50V) become one to feedback signal Vfb and feedbacking to controller 32, and a decision circuitry 36 of controller 32 inside judges according to this back coupling signal Vfb whether output voltage V out reaches a predeterminated voltage value (for example 50V), if, then export a control signal greater than reference signal Vref surely, control second comparator, 343 output positive voltages and control the 3rd switch Q3 conducting, then not conducting of second switch Q2, and make the switch Q1 conducting of winning, make the second output resistance Ro2 in parallel with the first output resistance Ro1, and the output current Iout that controller 32 is set increase.That is, the controller 32 of present embodiment is when judging that output voltage V out has reached the predeterminated voltage value, even do not finish the discharge time of RC circuit 342 (being the above-mentioned scheduled time) as yet, controller 32 can shift to an earlier date the conducting first switch Q1, makes output current Iout recover (increase) to the rated current Ip3 of light-emitting diode (LED) module 30.
Again referring to shown in Figure 8, it is the 3rd preferred embodiment of the drive circuit of light-emitting diode of the present invention, wherein output resistance Ro comprises one first output resistance Ro1 and one second output resistance Ro2, the led current of the end electric coupling controller 32 of the first output resistance Ro1 is set pin Iout set, other end ground connection, the end of the second output resistance Ro2 is in parallel with the end of the first output resistance Ro1; Output current is adjusted the first switch Q1 between the other end that circuit 33 ' comprises an other end that is serially connected in the first output resistance Ro1 and the second output resistance Ro2, one end connects input voltage vin, the other end connects one first resistance R 1 of the first switch Q1, one control is the first switch Q1 conducting whether second switch Q2, an and control second switch Q2 conducting whether comparator 331, one input of comparator 331 is connected with controller 32, another input is accepted a reference signal Vref (2.5V), and controller 32 is received when starting signal En, output is a control signal greater than reference signal Vref surely, control comparator 331 outputs one positive voltage conducting second switch Q2, make the control first not conducting of switch Q1, make the second output resistance Ro2 open circuit and not in parallel with the first output resistance Ro1, then output resistance Ro increases (Ro=Ro1), and the output current Iout that controller 32 is set reduces (Iout=Ip2), when the decision circuitry 36 of controller 32 judges that according to above-mentioned back coupling signal Vfb output voltage V out reaches predeterminated voltage, then output is controlled not conducting of second switch Q2 less than control signal control comparator 331 outputs one negative voltage of reference signal Vref in the position surely, then input voltage vin is via first resistance R, 1 conducting, the first switch Q1, make the second output resistance Ro2 in parallel with the first output resistance Ro1, and reducing output resistance Ro (Ro=Ro1//Ro2), the output current Iout that makes controller 32 set increases (Iout=Ip3).Whereby, the output current Iout that controller 32 is set reduces when circuit just starts, to impel booster circuit 31 quickly output voltage V out to be boosted to preset value, and after output voltage V out reaches preset value, the output current Iout that controller 32 is set increases, to provide enough output current to light-emitting diode (LED) module 30.
In sum, above-described embodiment does not reach the initial start up phase of predetermined voltage as yet at the output voltage V out of booster circuit 31, reduce the output current Iout that offers light-emitting diode (LED) module 30 earlier, make most input current Lin offer output capacitance C2 charging, after output voltage V out can be continued in Preset Time and boost fast reach predetermined voltage, increase the output current Iout that offers light-emitting diode (LED) module 30 again, reduce electric current whereby to the inductance L in the booster circuit 31, switch Q, the impact of diode D and output capacitance C2, make booster circuit 31 can adopt the inductance L of low rated current specification, switch Q, diode D and output capacitance C2, and the manufacturing cost of reduction circuit, and the consumption of minimizing electric energy, reach effect of the present invention and purpose.
Claims (5)
1. a LED driving circuit drives a light-emitting diode (LED) module that comprises plural light-emitting diode in order to start signal according to one, it is characterized in that:
This LED driving circuit comprises:
One booster circuit boosts to produce an output voltage and an output current drives this light-emitting diode (LED) module to an input voltage;
One controller operates in order to receive this startup signal, and can regulate the output current of this booster circuit;
One output resistance, electric coupling is set pin in a led current of this controller, and this controller is regulated the output current of this booster circuit according to this output resistance, and the size of this output current and the resistance of this output resistance are inversely proportional to; And
One output current is adjusted circuit, with this output resistance electric coupling, and when receiving this startup signal, increases the resistance of this output resistance, and this output current is reduced, and when finishing to a late Preset Time, reduces the resistance of this output resistance, and this output current is increased.
2. LED driving circuit according to claim 1, it is characterized in that: this output resistance comprises one first output resistance and one second output resistance, the led current of this first output resistance, one this controller of end electric coupling is set pin, other end ground connection, one end of this second output resistance is connected with an end of this first output resistance, this output current is adjusted circuit and is comprised first switch that is serially connected between the other end of the other end of this first output resistance and this second output resistance, one end connects this input voltage, the other end connects first resistance of this first switch, reach this first switch conduction whether delay circuit of control, when this delay circuit is received this startup signal, make this not conducting of first switch, make this first output resistance not in parallel with this second output resistance, make this output current reduce, when finishing to late this Preset Time, this delay circuit makes this first switch conduction, make this first output resistance in parallel with this second output resistance, make this output current increase.
3. LED driving circuit according to claim 2, it is characterized in that: this delay circuit comprises an end and this first switch are connected to control this first switch conduction whether second switch, one first comparator and one is connected the output of this first comparator and the resistor capacitor circuit between this second switch, this first comparator is accepted a reference signal and the input of this startup signal, when this starts signal reference position greater than this reference signal, this first comparator is exported a high voltage and is controlled this second switch conducting via this resistor capacitor circuit, and make this not conducting of first switch, up to this high voltage discharges this Preset Time through this resistor capacitor circuit after, control this not conducting of second switch, make this input voltage via this this first switch of first resistance conducting.
4. according to claim 2 or 3 described LED driving circuit, it is characterized in that: this delay circuit also comprises one second comparator and the 3rd switch that is connected with the output of this second comparator, whether itself and this second switch electric coupling is to control this second switch conducting, one input of this second comparator is connected with this controller, another input is accepted a reference signal, and this controller is also detected this output voltage and whether is reached a preset value, if, then output is controlled this second comparator greater than the control signal of this reference signal and is exported a high voltage and control the 3rd switch conduction in the position surely, makes this not conducting of second switch of control.
5. a LED driving circuit drives a light-emitting diode (LED) module that comprises plural light-emitting diode in order to start signal according to one, it is characterized in that:
This LED driving circuit comprises:
One booster circuit boosts to produce an output voltage and an output current drives this light-emitting diode (LED) module to an input voltage;
One controller operates in order to receive this startup signal, and can regulate the output current of this booster circuit;
One output resistance, electric coupling is set pin in a led current of this controller, and this controller is regulated the output current of this booster circuit according to this output resistance, and the size of this output current and the resistance of this output resistance are inversely proportional to; And
One output current is adjusted circuit, with this output resistance electric coupling, and when receiving this startup signal, increases the resistance of this output resistance, and this output current is reduced;
Wherein, this output resistance comprises one first output resistance and one second output resistance, the led current of this first output resistance, one this controller of end electric coupling is set pin, other end ground connection, one end of this second output resistance is connected with an end of this first output resistance, this output current is adjusted circuit and is comprised first switch that is serially connected between the other end of the other end of this first output resistance and this second output resistance, one end connects this input voltage, the other end connects one first resistance of this first switch, one this first switch conduction whether second switch of control, reach this second switch conducting whether comparator of control, one input of this comparator is connected with this controller, another input is accepted a reference signal, and when this controller is received this startup signal, output is a control signal greater than this reference signal surely, control this comparator and export this second switch of high levle voltage turn-on, make this not conducting of first switch of control, make this first output resistance not in parallel with this second output resistance, and reduce this output current, detect this output voltage up to this controller and reach a preset value, then output is controlled this comparator less than the control signal of this reference signal and is exported this not conducting of second switch of a low level voltage control in the position surely, then this input voltage is via this this first switch of first resistance conducting, make this first output resistance in parallel with this second output resistance, and increase this output current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100449115A CN103298183A (en) | 2012-02-24 | 2012-02-24 | Light-emitting diode driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100449115A CN103298183A (en) | 2012-02-24 | 2012-02-24 | Light-emitting diode driving circuit |
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| CN103298183A true CN103298183A (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100449115A Pending CN103298183A (en) | 2012-02-24 | 2012-02-24 | Light-emitting diode driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106455188A (en) * | 2016-08-03 | 2017-02-22 | 袁志贤 | Starting control circuit used for LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7015654B1 (en) * | 2001-11-16 | 2006-03-21 | Laughing Rabbit, Inc. | Light emitting diode driver circuit and method |
| TW200838356A (en) * | 2007-03-02 | 2008-09-16 | Wintek Corp | Light emitting diode drive apparatus |
| TWM395981U (en) * | 2010-07-29 | 2011-01-01 | Top Victory Invest Ltd | Light-emitting diode (LED) current balance circuit |
| TW201123974A (en) * | 2009-12-21 | 2011-07-01 | Top Victory Invest Ltd | Light-emitting diode (LED) driver |
-
2012
- 2012-02-24 CN CN2012100449115A patent/CN103298183A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7015654B1 (en) * | 2001-11-16 | 2006-03-21 | Laughing Rabbit, Inc. | Light emitting diode driver circuit and method |
| TW200838356A (en) * | 2007-03-02 | 2008-09-16 | Wintek Corp | Light emitting diode drive apparatus |
| TW201123974A (en) * | 2009-12-21 | 2011-07-01 | Top Victory Invest Ltd | Light-emitting diode (LED) driver |
| TWM395981U (en) * | 2010-07-29 | 2011-01-01 | Top Victory Invest Ltd | Light-emitting diode (LED) current balance circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106455188A (en) * | 2016-08-03 | 2017-02-22 | 袁志贤 | Starting control circuit used for LED lamp |
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Application publication date: 20130911 |