CN104619085A - Ultralow ripple LED eye-protecting lamp - Google Patents
Ultralow ripple LED eye-protecting lamp Download PDFInfo
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- CN104619085A CN104619085A CN201510055539.1A CN201510055539A CN104619085A CN 104619085 A CN104619085 A CN 104619085A CN 201510055539 A CN201510055539 A CN 201510055539A CN 104619085 A CN104619085 A CN 104619085A
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Abstract
The invention discloses an ultralow ripple LED (light emitting diode) eye-protecting lamp. The eye-protecting lamp is characterized in that a magnetic amplification circuit for neutralizing direct current magnetic bias and a Darlington cascade circuit are connected between an LED driving source and an LED lamp according to a magnetic amplifier theory and a Darlington cascade method when the LED driving source isn't changed. According to the LED eye-protecting lamp, the purpose of reducing current ripples, stabilizing instead of frequently flashing and protecting eyes can be realized, thus the cost is low.
Description
Technical field
The invention belongs to LED technical field, be specifically related to ultralow ripple LED eye-protective lamp.
Technical background
In the incandescent lighting epoch, although light efficiency is low, every watt is only had 15 lumens, and because tungsten filament has thermal inertia, when AC power zero passage moment, red-hot tungsten filament also has little time cooling, so our eyes do not perceive 50 hertz of stroboscopics.
The fluorescent material of fluorescent lamp, has twilight sunset, if contain the fluorescent material of rare earth " europium " (EU) element, has longer twilight sunset, can cover the stroboscopic of 50 hz AC power supply zero passages.
LED is the swift light source of nanosecond, and especially the LED point light source of light efficiency 300 lumens up to every watt, very dazzling, not only obviously sees 50 hertz of stroboscopics, even also sees and show that direct-current LED power supply ripple is shaken, and is easy to cause visual fatigue! The particularly LED of nominal 18 watts, is the common low price LED in market, has obvious 100 hertz of stroboscopics, and actual measurement LED current ripples, more than 30 percent, can take with digital camera the light flash that LED current ripple causes.Although LED can save more than 95 percent electric power than incandescent lamp, and the legal stopping production in the whole world stops pin incandescent lamp bulb, people still can't forbid cherishing the memory of incandescent lamp, exactly because facts have proved that incandescent lamp protects order than LED.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind ofly reduce current ripples, realize stable without stroboscopic, protect order, ultralow ripple LED eye-protective lamp that cost is low.
The present invention adopts following technical scheme to solve the problems of the technologies described above:
Ultralow ripple LED eye-protective lamp, AC power, through LED drive power driving LED lamp, also accesses the magnetic amplifying circuit for offseting D.C. magnetic biasing and Darlington cascade circuit between LED drive power and LED;
Magnetic amplifying circuit comprises: symmetrical winding emitter-base bandgap grading winding and base stage winding on magnet ring B, and emitter-base bandgap grading winding comprises emitter-base bandgap grading winding N11 and emitter-base bandgap grading winding N12, and base stage winding comprises base stage winding Nb1 and base stage winding Nb2; The output cathode end of LED drive power connects the different name end of emitter-base bandgap grading winding N11 and the Same Name of Ends of emitter-base bandgap grading winding N12 simultaneously, and the output negative pole end of LED drive power connects the output cathode end of LED drive power after electric capacity C1N; The emitter of the Same Name of Ends connecting triode T2 of emitter-base bandgap grading winding N11, the emitter of the different name end connecting triode T5 of emitter-base bandgap grading winding N12; The base stage of the Same Name of Ends connecting triode T3 of base stage winding Nb1, the different name end of base stage winding Nb1 is connected the negative pole of LED again with the Same Name of Ends of base stage winding Nb2 simultaneously after electric capacity C03, the base stage of the different name end connecting triode T6 of base stage winding Nb2; The output negative pole end of LED drive power connects the negative pole of LED;
Darlington cascade circuit comprises: the base stage of the collector electrode connecting triode T1 of triode T2, the collector electrode of base stage connecting triode T3; The emitter of the emitter connecting triode T1 of triode T3; The emitter of triode T1 connects the positive pole of LED, and collector electrode connects the output cathode end of LED drive power; The base stage of the collector electrode connecting triode T4 of triode T5, the collector electrode of base stage connecting triode T6; The emitter of the emitter connecting triode T4 of triode T6; The emitter of triode T4 connects the positive pole of LED, and collector electrode connects the output cathode end of LED drive power; Series capacitance Cb1 and electric capacity C01 successively between the base stage of triode T3 and emitter, series capacitance Cb2 and electric capacity C02 successively between the base stage of triode T6 and emitter; The negative pole of LED is connected between electric capacity Cb1 and electric capacity C01, between electric capacity Cb2 and electric capacity C02;
The output cathode end of LED drive power also connects the different name end of base stage winding Nb1 and the Same Name of Ends of base stage winding Nb2, for soft start after resistance NCT simultaneously.
Described magnet ring B adopts high magnetic conduction cold-rolled silicon steel tape magnet ring, external diameter 20 millimeters, and internal diameter 14 millimeters is high 5 millimeters.
The turn ratio of emitter-base bandgap grading winding N11 and base stage winding Nb1 is 1:10; The turn ratio of emitter-base bandgap grading winding N12 and base stage winding Nb2 is 1:10.
Emitter-base bandgap grading winding N11 and emitter-base bandgap grading winding N12 is all with diameter 0.27 millimeter of silk-covered wire Double-wire parallel wound 10 circle; Base stage winding Nb1 and base stage winding Nb2 is all with diameter 0.01 silk-covered wire Double-wire parallel wound 100 circle.
The model of triode T1 and triode T4 is NPN type 8050; The model of triode T2 and triode T5 is positive-negative-positive 9015; The model of triode T3 and triode T6 is NPN type 9014; Electric capacity C01, electric capacity C02, electric capacity C03, electric capacity Cb1, electric capacity Cb2 and electric capacity C1N all adopt the solid capacitor of 1 microfarad 25 volts, and resistance NCT is the negative temperature coefficient resister of 10K.
The invention has the advantages that: LED of the present invention can realize ultralow current ripples, stablizes without stroboscopic, protect order, and cost is low.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention ultralow ripple LED eye-protective lamp.
Embodiment
Below the specific embodiment of the present invention is described in detail, but does not form limiting the scope of the invention.
As shown in Figure 1, ultralow ripple LED eye-protective lamp, AC power, through LED drive power driving LED lamp, also accesses the magnetic amplifying circuit for offseting D.C. magnetic biasing and Darlington cascade circuit between LED drive power and LED;
Magnetic amplifying circuit comprises: symmetrical winding emitter-base bandgap grading winding and base stage winding on magnet ring B, and emitter-base bandgap grading winding comprises emitter-base bandgap grading winding N11 and emitter-base bandgap grading winding N12, and base stage winding comprises base stage winding Nb1 and base stage winding Nb2; The output cathode end of LED drive power connects the different name end of emitter-base bandgap grading winding N11 and the Same Name of Ends of emitter-base bandgap grading winding N12 simultaneously, and the output negative pole end of LED drive power connects the output cathode end of LED drive power after electric capacity C1N; The emitter of the Same Name of Ends connecting triode T2 of emitter-base bandgap grading winding N11, the emitter of the different name end connecting triode T5 of emitter-base bandgap grading winding N12; The base stage of the Same Name of Ends connecting triode T3 of base stage winding Nb1, the different name end of base stage winding Nb1 is connected the negative pole of LED again with the Same Name of Ends of base stage winding Nb2 simultaneously after electric capacity C03, the base stage of the different name end connecting triode T6 of base stage winding Nb2; The output negative pole end of LED drive power connects the negative pole of LED;
Darlington cascade circuit comprises: the base stage of the collector electrode connecting triode T1 of triode T2, the collector electrode of base stage connecting triode T3; The emitter of the emitter connecting triode T1 of triode T3; The emitter of triode T1 connects the positive pole of LED, and collector electrode connects the output cathode end of LED drive power; The base stage of the collector electrode connecting triode T4 of triode T5, the collector electrode of base stage connecting triode T6; The emitter of the emitter connecting triode T4 of triode T6; The emitter of triode T4 connects the positive pole of LED, and collector electrode connects the output cathode end of LED drive power; Series capacitance Cb1 and electric capacity C01 successively between the base stage of triode T3 and emitter, series capacitance Cb2 and electric capacity C02 successively between the base stage of triode T6 and emitter; The negative pole of LED is connected between electric capacity Cb1 and electric capacity C01, between electric capacity Cb2 and electric capacity C02;
The output cathode end of LED drive power also connects the different name end of base stage winding Nb1 and the Same Name of Ends of base stage winding Nb2, for soft start after resistance NCT simultaneously.
Described magnet ring B adopts high magnetic conduction cold-rolled silicon steel tape magnet ring, external diameter 20 millimeters, and internal diameter 14 millimeters is high 5 millimeters.
The turn ratio of emitter-base bandgap grading winding N11 and base stage winding Nb1 is 1:10; The turn ratio of emitter-base bandgap grading winding N12 and base stage winding Nb2 is 1:10.
Emitter-base bandgap grading winding N11 and emitter-base bandgap grading winding N12 is all with diameter 0.27 millimeter of silk-covered wire Double-wire parallel wound 10 circle; Base stage winding Nb1 and base stage winding Nb2 is all with diameter 0.01 silk-covered wire Double-wire parallel wound 100 circle.
For below 1A LED current, the model of triode T1 and triode T4 is NPN type 8050; The model of triode T2 and triode T5 is positive-negative-positive 9015; The model of triode T3 and triode T6 is NPN type 9014; Electric capacity C01, electric capacity C02, electric capacity C03, electric capacity Cb1, electric capacity Cb2 and electric capacity C1N all adopt the electric capacity of 1 microfarad 25 volts, and resistance NCT is the negative temperature coefficient resister of 10K.For the LED current more than 1A, the model of palpus adaptive triode T1 to triode T4.
Magnetic amplifying circuit of the present invention, adopts the magnet ring B of small size, and use symmetric winding to offset D.C. magnetic biasing, winding exciting curent is only the power that ripple dynamic current is very little.Wherein, emitter-base bandgap grading winding N11 and emitter-base bandgap grading winding N12 is all with diameter 0.27 millimeter of silk-covered wire Double-wire parallel wound 10 circle; Base stage winding Nb1 and base stage winding Nb2 is all with diameter 0.01 silk-covered wire Double-wire parallel wound 100 circle, makes magnet ring B become amplification coefficient AO to be the magnetic coupling device of 10 times.Magnet ring B and emitter-base bandgap grading winding thereof and base stage winding are zero to pure dc component transfer function, not reaction; If the current amplification factor K1 of NPN type 9014, the current amplification factor K2 of positive-negative-positive 9015, the current amplification factor K3 of NPN type 8050, the then ripple coefficient of LED drive power output, after above-mentioned magnetic amplifying circuit and Darlington cascade circuit, LED load current ripples attenuation coefficient is one of (2 × AO × K1 × K2 × K3) part, realizes being similar to battery lightening LED lamp so steadily stable light source.Resistance NCT plays soft start effect, resistance NCT cold-state resistance is 10K, when the base current 2 × Ibe of two NPN type 9014 flows through resistance NCT, resistance NCT step-down is charged to electric capacity C03, along with the terminal voltage of electric capacity C03 rises gradually, LED achieves soft start, and after resistance NCT generates heat, resistance value drops to below 1K, and LED current stabilization is in rated value.Adaptive resistance NCT just can finely tune LED electric current and reach rated value steady operation all the time.
Claims (5)
1. ultralow ripple LED eye-protective lamp, AC power, through LED drive power driving LED lamp, is characterized in that, also accesses the magnetic amplifying circuit for offseting D.C. magnetic biasing and Darlington cascade circuit between LED drive power and LED;
Magnetic amplifying circuit comprises: symmetrical winding emitter-base bandgap grading winding and base stage winding on magnet ring B, and emitter-base bandgap grading winding comprises emitter-base bandgap grading winding N11 and emitter-base bandgap grading winding N12, and base stage winding comprises base stage winding Nb1 and base stage winding Nb2; The output cathode end of LED drive power connects the different name end of emitter-base bandgap grading winding N11 and the Same Name of Ends of emitter-base bandgap grading winding N12 simultaneously, and the output negative pole end of LED drive power connects the output cathode end of LED drive power after electric capacity C1N; The emitter of the Same Name of Ends connecting triode T2 of emitter-base bandgap grading winding N11, the emitter of the different name end connecting triode T5 of emitter-base bandgap grading winding N12; The base stage of the Same Name of Ends connecting triode T3 of base stage winding Nb1, the different name end of base stage winding Nb1 is connected the negative pole of LED again with the Same Name of Ends of base stage winding Nb2 simultaneously after electric capacity C03, the base stage of the different name end connecting triode T6 of base stage winding Nb2; The output negative pole end of LED drive power connects the negative pole of LED;
Darlington cascade circuit comprises: the base stage of the collector electrode connecting triode T1 of triode T2, the collector electrode of base stage connecting triode T3; The emitter of the emitter connecting triode T1 of triode T3; The emitter of triode T1 connects the positive pole of LED, and collector electrode connects the output cathode end of LED drive power; The base stage of the collector electrode connecting triode T4 of triode T5, the collector electrode of base stage connecting triode T6; The emitter of the emitter connecting triode T4 of triode T6; The emitter of triode T4 connects the positive pole of LED, and collector electrode connects the output cathode end of LED drive power; Series capacitance Cb1 and electric capacity C01 successively between the base stage of triode T3 and emitter, series capacitance Cb2 and electric capacity C02 successively between the base stage of triode T6 and emitter; The negative pole of LED is connected between electric capacity Cb1 and electric capacity C01, between electric capacity Cb2 and electric capacity C02;
The output cathode end of LED drive power also connects the different name end of base stage winding Nb1 and the Same Name of Ends of base stage winding Nb2, for soft start after resistance NCT simultaneously.
2. ultralow ripple LED eye-protective lamp according to claim 1, is characterized in that, described magnet ring B adopts high magnetic conduction cold-rolled silicon steel tape magnet ring, external diameter 20 millimeters, and internal diameter 14 millimeters is high 5 millimeters.
3. ultralow ripple LED eye-protective lamp according to claim 1, is characterized in that, the turn ratio of emitter-base bandgap grading winding N11 and base stage winding Nb1 is 1:10; The turn ratio of emitter-base bandgap grading winding N12 and base stage winding Nb2 is 1:10.
4. ultralow ripple LED eye-protective lamp according to claim 3, is characterized in that, emitter-base bandgap grading winding N11 and emitter-base bandgap grading winding N12 is all with diameter 0.27 millimeter of silk-covered wire Double-wire parallel wound 10 circle; Base stage winding Nb1 and base stage winding Nb2 is all with diameter 0.01 silk-covered wire Double-wire parallel wound 100 circle.
5. ultralow ripple LED eye-protective lamp according to claim 1, it is characterized in that, the model of triode T1 and triode T4 is NPN type 8050; The model of triode T2 and triode T5 is positive-negative-positive 9015; The model of triode T3 and triode T6 is NPN type 9014; Electric capacity C01, electric capacity C02, electric capacity C03, electric capacity Cb1, electric capacity Cb2 and electric capacity C1N all adopt the solid capacitor of 1 microfarad 25 volts, and resistance NCT is the negative temperature coefficient resister of 10K.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510055539.1A CN104619085B (en) | 2015-01-31 | 2015-01-31 | Ultralow ripple LED eye-protective lamps |
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| CN201510055539.1A CN104619085B (en) | 2015-01-31 | 2015-01-31 | Ultralow ripple LED eye-protective lamps |
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| CN104619085B CN104619085B (en) | 2017-07-04 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084331A (en) * | 1992-09-15 | 1994-03-23 | 陈广华 | Bridge rectifier and full-wave rectification converter ic |
| CN1462109A (en) * | 2001-03-16 | 2003-12-17 | 台达电子工业股份有限公司 | Auxiliary output voltage control realized using idirectional magnetization magnetic amplifier |
| CN101080126A (en) * | 2007-06-08 | 2007-11-28 | 灿瑞半导体(上海)有限公司 | High-power LED driving circuit |
| CN103066817A (en) * | 2012-12-24 | 2013-04-24 | 成都芯源系统有限公司 | Ripple suppression circuit, power supply system thereof and ripple suppression method |
-
2015
- 2015-01-31 CN CN201510055539.1A patent/CN104619085B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084331A (en) * | 1992-09-15 | 1994-03-23 | 陈广华 | Bridge rectifier and full-wave rectification converter ic |
| CN1462109A (en) * | 2001-03-16 | 2003-12-17 | 台达电子工业股份有限公司 | Auxiliary output voltage control realized using idirectional magnetization magnetic amplifier |
| CN101080126A (en) * | 2007-06-08 | 2007-11-28 | 灿瑞半导体(上海)有限公司 | High-power LED driving circuit |
| CN103066817A (en) * | 2012-12-24 | 2013-04-24 | 成都芯源系统有限公司 | Ripple suppression circuit, power supply system thereof and ripple suppression method |
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| CN104619085B (en) | 2017-07-04 |
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