CN104640269A - Light source device - Google Patents
Light source device Download PDFInfo
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- CN104640269A CN104640269A CN201310552846.1A CN201310552846A CN104640269A CN 104640269 A CN104640269 A CN 104640269A CN 201310552846 A CN201310552846 A CN 201310552846A CN 104640269 A CN104640269 A CN 104640269A
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Abstract
A light source device comprises a boosting circuit, a light emitting component, a feedback resistor, a feedback circuit and a control unit. The boosting circuit decides boosting times of input voltage according to boosting controls signals of the control unit and provides driving voltage to the light emitting component. The feedback resistor is serially connected with the light emitting component. The feedback circuit receives feedback voltage provided by the feedback resistor and provides feedback reference voltage and control reference voltage to the control unit, and the feedback reference voltage is higher than the feedback voltage. The control unit adjusts duty cycle of the boosting control signals according to the received control reference voltage.
Description
Technical field
The present invention relates to a kind of light supply apparatus, particularly a kind of light supply apparatus with light-emitting diode.
Background technology
Along with the evolution of lighting technology, the light emitting source that light fixture adopts advances to light-emitting diode (light emitting diode, LED) flourish fast in recent years from incandescent lamp bulb, fluorescent tube always.Light-emitting diode has power saving, long service life, environmental protection, startup is quick, volume is little ... etc. multiple advantage, and the power that light-emitting diode can reach becomes large gradually along with the maturation of technology, therefore light-emitting diode has and is applied to general lighting gradually to replace the trend of fluorescent tube.
In light supply apparatus, light-emitting component can be connected in series at least one feedback resistance, judges with the feedback voltage provided by feedback resistance the electric current flowing through light-emitting component.In order to the luminosity of stabilized illumination element, the driving voltage that light supply apparatus can receive according to the electric current adjustment light-emitting component flowing through light-emitting component.But when light-emitting component serial connection feedback resistance, if the driving voltage that light-emitting component receives is a high voltage (such as 200 volts), then the electric current flowing through light-emitting component can uprise, and makes the cross-pressure of feedback resistance uprise.Now, the power consumption of feedback resistance can improve, to such an extent as to causes the waste of electric power, and too high cross-pressure may cause burning of feedback resistance.
Summary of the invention
The invention provides a kind of light supply apparatus, the cross-pressure of feedback resistance can be reduced and do not affect the FEEDBACK CONTROL of light-emitting diode, thus the power loss of feedback resistance can be reduced and reduce the probability that feedback resistance burns.
Other object of the present invention and advantage can be further understood from the technical characteristic disclosed by the present invention.
For reaching one of above-mentioned or partly or entirely object or other object, one embodiment of the invention provide a kind of light supply apparatus, comprise booster circuit, light-emitting component, feedback resistance, feedback circuit and control unit.Booster circuit receives input voltage and voltage up control signal, in order to determine the boosting multiple of input voltage according to voltage up control signal, to provide driving voltage.Light-emitting component couples booster circuit, to receive driving voltage.Feedback resistance is coupled between light-emitting component and earthed voltage, and provides feedback voltage.Feedback circuit couples feedback resistance to receive feedback voltage, and provides feedback reference voltage according to feedback voltage and control reference voltage, and wherein feedback reference voltage is greater than feedback voltage.Control unit has reference voltage end, compare end and lock control end, and wherein lock control end couples booster circuit to provide voltage up control signal, reference voltage end and compare end and couple feedback circuit to receive feedback reference voltage respectively and to control reference voltage.Feedback circuit controls reference voltage according to feedback reference voltage adjustment, and control unit is according to the responsibility cycle controlling reference voltage adjustment voltage up control signal.
The light supply apparatus of one embodiment of the invention, wherein feedback circuit comprises the first resistance, is coupled to reference voltage end and compares between end; First electric capacity, is coupled to reference voltage end and compares between end; Second resistance, is coupled between reference voltage end and reference voltage; 3rd resistance, one end of the 3rd resistance couples reference voltage end; 4th resistance, between the other end being coupled to the 3rd resistance and feedback resistance; And the 5th resistance, between the other end being coupled to the 3rd resistance and earthed voltage.
The light supply apparatus of one embodiment of the invention, wherein control unit comprises: operational amplifier and PWM circuit, the first input end of operational amplifier couples reference voltage end, and the second input of operational amplifier receives comparative voltage, and the output of operational amplifier couples and compares end; PWM circuit couples and compares end to receive control reference voltage, and couples lock control end to provide voltage up control signal.
The light supply apparatus of one embodiment of the invention, wherein booster circuit comprises inductance, diode, switch and the second electric capacity, the first end of inductance receives input voltage, the anode of diode couples the second end of inductance, the negative electrode outputting drive voltage of diode, the first end of switch couples the second end of inductance, and the control end of switch receives voltage up control signal, second end of switch couples earthed voltage, and the second electric capacity is coupled between the negative electrode of diode and earthed voltage.
The light supply apparatus of one embodiment of the invention, its breaker in middle comprises transistor.
The light supply apparatus of one embodiment of the invention, wherein light-emitting component comprises at least one light-emitting diode.
Based on above-mentioned, the light supply apparatus of the embodiment of the present invention, can reduce the cross-pressure of feedback resistance and not affect the FEEDBACK CONTROL of light-emitting diode.Thus the power loss of feedback resistance can be reduced and reduce the feedback resistance probability of burning.The control unit of the light supply apparatus of the embodiment of the present invention can use the integrated circuit determining voltage, and the function of voltage integrated circuit is determined in expansion, can replace the integrated circuit determining electric current in a straightforward manner.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing to be described in detail below.
Accompanying drawing explanation
Fig. 1 is the system schematic of the light supply apparatus according to the embodiment of the present invention.
Fig. 2 is the circuit diagram of the light supply apparatus according to the embodiment of the present invention.
Fig. 3 is the control unit of Fig. 2 and the ac equivalent circuit figure of feedback circuit of the foundation embodiment of the present invention.
Fig. 4 is the control unit of stable feedback and the ac equivalent circuit figure of feedback circuit of the foundation embodiment of the present invention.
Embodiment
Aforementioned and other technology contents, feature and effect for the present invention, in the detailed description of following cooperation with reference to graphic multiple embodiments, can clearly present.The direction term mentioned in following examples, such as " on ", D score, "front", "rear", "left", "right" etc., be only the direction with reference to annexed drawings.Therefore, the direction term of use is used to illustrate, but not is used for limiting the present invention.
Fig. 1 is the system schematic of the light supply apparatus according to one embodiment of the invention.Please refer to Fig. 1, in the present embodiment, light supply apparatus 100 comprises booster circuit 110, light-emitting component 120, feedback circuit 130, control unit 140 and feedback resistance RF.Booster circuit 110 receives input voltage vin and voltage up control signal SCB, in order to determine the boosting multiple (i.e. multiplication factor) of input voltage vin according to voltage up control signal SCB, to provide driving voltage Vdr.
Light-emitting component 120 couples booster circuit 110, to receive driving voltage Vdr.Feedback resistance RF is coupled between light-emitting component 120 and earthed voltage, and provides feedback voltage V F.Feedback circuit 130 couples feedback resistance RF to receive feedback voltage V F, and provide feedback reference voltage VFR according to feedback voltage V F and control reference voltage VCR, wherein feedback reference voltage VFR is greater than feedback voltage V F, that is feedback circuit 130 is the feedback circuit of boost mode.Control unit 140 has reference voltage end TV, compares end TC and lock control end TG.Lock control end TG couples booster circuit 110 to provide voltage up control signal SCB, reference voltage end TV and compare end TC and couple feedback circuit 130 to receive feedback reference voltage VFR respectively and to control reference voltage VCR.Wherein, feedback circuit 130 adjusts according to feedback reference voltage VFR and controls reference voltage VCR, and control unit 140 adjusts the responsibility cycle of voltage up control signal SCB according to controlling reference voltage VCR.
According to above-mentioned, due to the design of feedback circuit 130, feedback resistance RF can provide lower feedback voltage V F and not affect the running of control unit 140, and can reduce the power loss of feedback resistance and reduce the feedback resistance probability of burning.
Fig. 2 is the circuit diagram of the light supply apparatus according to one embodiment of the invention.Please refer to Fig. 1 and Fig. 2, in the present embodiment, the circuit structure of light supply apparatus 200 is approximately identical to light supply apparatus 100, and wherein same or similar element uses same or similar label, and control unit 140a can be Controlled in Current Mode and Based wafer (such as UC3843).
Booster circuit 110a comprises inductance L 1, diode (at this for Zener diode D1), switch (at this for transistor M1) and electric capacity C1.The first end of inductance L 1 receives input voltage vin, and the second end of inductance L 1 is coupled to the anode of diode D1, and the negative electrode of diode D1 exports the driving voltage Vdr of driving light source 120a.The drain electrode (first end to inductive switch) of transistor M1 is coupled to the second end of inductance L 1, the grid (control end to inductive switch) of transistor M1 is coupled to the lock control end TG of control unit 140a to receive voltage up control signal SCB, and the source electrode (the second end to inductive switch) of transistor M1 is coupled to earthed voltage.Between the negative electrode that electric capacity C1 is coupled to diode D1 and earthed voltage.
In an embodiment of the present invention, voltage up control signal SCB is such as pulse wave width modulation (PWM) signal, to control the conduction period of transistor M1.When transistor M1 conducting, the anode voltage of diode D1 can be less than cathode voltage, and now diode D1 ends, and input voltage vin can be charged to inductance L 1, and inductance L 1 starts storage power.Otherwise when transistor M1 ends, now diode D1 conducting, the electric current of inductance L 1 can continue charge to electric capacity C1 and supply energy to light-emitting component 120a, the conduction period of transistor M1 just can be utilized to adjust the size of driving voltage Vdr thus.
In the present embodiment, light-emitting component 120a is by multiple light-emitting diode (Light emitting diode, LED) LD series connection formed, the anode of the 1st light-emitting diode LD couples booster voltage 110a to receive driving voltage Vdr, the negative electrode of last light-emitting diode LD couples one end of feedback resistance RF, the other end of feedback resistance RF then couples earthed voltage, and wherein one end of feedback resistance RF provides feedback voltage V F.In other embodiments, light-emitting component 120a can be made up of a light-emitting diode LD, but the embodiment of the present invention is not as limit.
Feedback circuit 130a comprises resistance R1 ~ R5, electric capacity C2.The reference voltage end TV and comparing that resistance R1 and electric capacity C2 are coupled to control unit 140a holds between TC.Resistance R2 is coupled to reference voltage end TV and the reference voltage VR(such as 5 volts of control unit 140a) between.One end of resistance R3 couples the reference voltage end TV of control unit 140a, and the other end of resistance R3 is coupled to one end of resistance R4.The other end of resistance R4 then couples feedback resistance RF to receive feedback voltage V F.Between the other end that resistance R5 is coupled to resistance R3 and earthed voltage.
Control unit 140a comprises operational amplifier OP and PWM circuit 141.The negative input end (corresponding first input end) of operational amplifier OP is coupled to reference voltage end TV to receive feedback reference voltage VFR, the positive input terminal (corresponding second input) of operational amplifier OP receives comparative voltage Vcm(such as 2.5 volts), the output of operational amplifier OP is then coupled to and compares end TC.PWM circuit 141 is coupled to and compares end TC to receive control reference voltage VCR, and PWM circuit 141 can be coupled to lock control end TG to provide voltage up control signal SCB.
With reference to shown in Fig. 2, suppose that comparative voltage Vcm is 2.5 volts, the voltage of the common port of resistance R3, R4 and R5 is U, according to Kirchhoff s current law (Kirchoffs Current Law, KCL), the total current of the common port of resistance R3, R4 and R5 is zero, as shown in following equation:
(2.5-U)/R3+(VF-U)/R4+(0-U)/R5=0……………(1)
Wherein, above-mentioned R3, R4 and R5 are the resistance value representing resistance R3, R4 and R5 respectively.Moreover, suppose that the resistance value of resistance R4 is very large, and the reference voltage end TV input impedance of control unit 140a is very high, so the electric current entering resistance R4 and reference voltage end TV all can be left in the basket.Further, hypothetical reference voltage VR is 5 volts, and current value I such as the following equation flowed through on resistance R2 represents:
I=2.5/R2=(2.5-U)/R3=(5-U)/(R2+R3)……………(2)
Wherein, above-mentioned R2 and R3 is the resistance value representing resistance R2 and R3 respectively.In conjunction with (1) formula and (2) formula, the relation of the size of feedback voltage V F and the resistance value of resistance R2 to R5 can be obtained after cancellation U, as following equation represents:
VF=2.5(R2-R3)(R4+R5)/(R2*R5)-2.5R4/R2
According to above-mentioned, the voltage relationship of feedback voltage V F and feedback reference voltage VFR can be changed by adjusting resistance R2, R3 and R5, namely adjust the voltage multiplication of feedback voltage V F and feedback reference voltage VFR.
Fig. 3 is the control unit of Fig. 2 and the ac equivalent circuit figure of feedback circuit of foundation one embodiment of the invention.Fig. 4 is the control unit of stable feedback and the ac equivalent circuit figure of feedback circuit of foundation one embodiment of the invention.Can the circuit of light supply apparatus 200 shown in Fig. 2 realize, and depends on whether the control system of circuit is stablized, and therefore the ac equivalent circuit of following ac equivalent circuit and the present embodiment to stablizing feedback compares.
Please also refer to Fig. 3 and Fig. 4, in the present embodiment, the system function that setting feedback voltage V F is corresponding is Uin, and the system function controlling reference voltage corresponding is Uout.System function such as the following equation of ac equivalent circuit shown in Fig. 4 represents:
F(S)=Uout(S)/Uin(S)=-Ra/(Rb*(1+SRaCa))
Wherein, above-mentioned Ra and Rb is the resistance value representing resistance Ra and Rb respectively, and above-mentioned Ca is the capacitance representing electric capacity Ca, and S is an algebraically.System function such as the following equation of ac equivalent circuit shown in Fig. 3 represents:
F(S)=Uout(S)/Uin(S)=-R1R5/((1+SR1C2)*(R4(R3+R5)+R3R5)
Wherein, above-mentioned R1, R3 and R4 are the resistance value representing resistance R1, R3 and R4 respectively, and above-mentioned C2 is the capacitance representing electric capacity C2, and S is an algebraically.Due to the ac equivalent circuit that Fig. 4 is stable feedback, if the system function of ac equivalent circuit shown in Fig. 3 and Fig. 4 is identical, ac equivalent circuit shown in representative graph 3 is the circuit of stable feedback, and imposing a condition of resistance R1, R3 and R4 and electric capacity C2 can with reference to following:
Ra=R1
RaCa=R1C2
Rb=(R4(R3+R5)+R3R5)/R5
In one embodiment, selecting of each element is such as: resistance Ra=100K, resistance Rb=1K, electric capacity Ca=0.1uF.Resistance R5=1K, resistance R1=resistance Ra, electric capacity Ca=electric capacity C2, resistance R4=0.5K, resistance R3=1/3K, resistance R2=0.91K, calculates feedback voltage V F=1V, and the feedback voltage compared to front case is generally 2.5V, and the present embodiment can reduce feedback voltage really.
According to above-mentioned, the light supply apparatus of the embodiment of the present invention can reduce the power loss of feedback resistance and reduce the probability that feedback resistance burns.The control unit of the light supply apparatus of the embodiment of the present invention can use the integrated circuit determining voltage, and the function of voltage integrated circuit is determined in expansion, can replace the integrated circuit determining electric current in a straightforward manner.
The above, be only the preferred embodiments of the present invention, can not limit scope of the invention process with this, and the simple equivalence namely generally done according to the claims in the present invention and invention description content changes and modification, all still remains within the scope of the patent.In addition, any embodiment of the present invention or claim must not reach whole object disclosed by the present invention or advantage or feature.In addition, summary part and title are only used to the use of auxiliary patent document search, are not used for the interest field of restriction the present invention.
[symbol description]
100,200: light supply apparatus
110,110a: booster circuit
120,120a: light-emitting component
130,130a: feedback circuit
140,140a: control unit
141: PWM circuit
C1, C2, Ca: electric capacity
D1: diode
L1: inductance
LD: light-emitting diode
M1: transistor
OP: operational amplifier
R1 ~ R5, Ra, Rb: resistance
RF: feedback resistance
SCB: voltage up control signal
TC: compare end
TG: lock control end
TV: reference voltage end
Vcm: comparative voltage
VCR: control reference voltage
Vdr: driving voltage
VF: feedback voltage
VFR: feedback reference voltage
Vin: input voltage
VR: reference voltage.
Claims (6)
1. a light supply apparatus, comprising:
Booster circuit, receives input voltage and voltage up control signal, in order to determine the boosting multiple of described input voltage according to described voltage up control signal, to provide driving voltage;
Light-emitting component, couples described booster circuit, to receive described driving voltage;
Feedback resistance, is coupled between described light-emitting component and earthed voltage, and provides feedback voltage;
Feedback circuit, couples described feedback resistance to receive described feedback voltage, and provides feedback reference voltage according to described feedback voltage and control reference voltage, and wherein said feedback reference voltage is greater than described feedback voltage; And
Control unit, there is reference voltage end, compare end and lock control end, described lock control end couples described booster circuit to provide described voltage up control signal, described reference voltage end and the described end that compares couple described feedback circuit to receive described feedback reference voltage and described control reference voltage respectively, wherein said feedback circuit adjusts described control reference voltage according to described feedback reference voltage, and described control unit adjusts the responsibility cycle of described voltage up control signal according to described control reference voltage.
2. light supply apparatus as claimed in claim 1, wherein said feedback circuit comprises:
First resistance, is coupled to described reference voltage end and compares between end with described;
First electric capacity, is coupled to described reference voltage end and compares between end with described;
Second resistance, is coupled between described reference voltage end and reference voltage;
3rd resistance, one end of described 3rd resistance couples described reference voltage end;
4th resistance, between the other end being coupled to described 3rd resistance and described feedback resistance; And
5th resistance, between the described other end being coupled to described 3rd resistance and described earthed voltage.
3. light supply apparatus as claimed in claim 1, wherein said control unit comprises:
Operational amplifier, the first input end of described operational amplifier couples described reference voltage end, and the second input of described operational amplifier receives comparative voltage, and the output of described operational amplifier couples and describedly compares end; And
PWM circuit, couples the described end that compares to receive described control reference voltage, and couples described lock control end to provide described voltage up control signal.
4. light supply apparatus as claimed in claim 1, wherein said booster circuit comprises:
Inductance, the first end of described inductance receives described input voltage;
Diode, the anode of described diode couples the second end of described inductance, and the negative electrode of described diode exports described driving voltage;
Switch, the first end of described switch couples described second end of described inductance, and the control end of described switch receives described voltage up control signal, and the second end of described switch couples described earthed voltage; And
Second electric capacity, is coupled between the described negative electrode of described diode and described earthed voltage.
5. light supply apparatus as claimed in claim 4, wherein said switch comprises transistor.
6. light supply apparatus as claimed in claim 1, wherein said light-emitting component comprises at least one light-emitting diode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310552846.1A CN104640269A (en) | 2013-11-08 | 2013-11-08 | Light source device |
| TW103113692A TWI567445B (en) | 2013-11-08 | 2014-04-15 | Light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310552846.1A CN104640269A (en) | 2013-11-08 | 2013-11-08 | Light source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104640269A true CN104640269A (en) | 2015-05-20 |
Family
ID=53218444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310552846.1A Pending CN104640269A (en) | 2013-11-08 | 2013-11-08 | Light source device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN104640269A (en) |
| TW (1) | TWI567445B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151775A (en) * | 2016-12-05 | 2018-06-12 | 株式会社三丰 | The light source of encoder and encoder |
| CN108966416A (en) * | 2018-07-11 | 2018-12-07 | 昆山仕优威电子科技有限公司 | A kind of control system of UV LED light source |
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| JP4123819B2 (en) * | 2002-05-15 | 2008-07-23 | ウシオ電機株式会社 | Light source device |
| TWI377534B (en) * | 2007-07-06 | 2012-11-21 | Chimei Innolux Corp | Light sources control circuit |
| US7888888B2 (en) * | 2007-07-11 | 2011-02-15 | Industrial Technology Research Institute | Light source apparatus and driving apparatus thereof |
| TWI381341B (en) * | 2007-09-21 | 2013-01-01 | Chimei Innolux Corp | Backlight control circuit |
| CN102209413B (en) * | 2010-08-16 | 2013-11-13 | 深圳市航嘉驰源电气股份有限公司 | Current feedback circuit and LED (light-emitting diode) lamp drive circuit |
| TWI439169B (en) * | 2011-07-08 | 2014-05-21 | Ind Tech Res Inst | Light emitting diode driving circuit |
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- 2014-04-15 TW TW103113692A patent/TWI567445B/en not_active IP Right Cessation
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8217592B2 (en) * | 2009-02-06 | 2012-07-10 | Au Optronics Corp. | Light emitting diode driving device and driving method thereof |
| CN201388317Y (en) * | 2009-03-23 | 2010-01-20 | 山东交通职业学院 | LCD backlight-driving power saving circuit |
| CN102404917A (en) * | 2010-11-12 | 2012-04-04 | 孙善齐 | Reactance type LED lighting current control method |
| CN102752908A (en) * | 2011-04-18 | 2012-10-24 | 松下电器产业株式会社 | Semiconductor light-emiting element driver circuit and light fixture using the same |
| CN102739044A (en) * | 2012-06-29 | 2012-10-17 | 圣邦微电子（北京）股份有限公司 | DC/DC (direct current) boost converter and LED (light emitting diode) driver |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151775A (en) * | 2016-12-05 | 2018-06-12 | 株式会社三丰 | The light source of encoder and encoder |
| CN108151775B (en) * | 2016-12-05 | 2022-01-25 | 株式会社三丰 | Encoder and light source of encoder |
| CN108966416A (en) * | 2018-07-11 | 2018-12-07 | 昆山仕优威电子科技有限公司 | A kind of control system of UV LED light source |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201518803A (en) | 2015-05-16 |
| TWI567445B (en) | 2017-01-21 |
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Application publication date: 20150520 |