CN103687206A - LED flashlight - Google Patents
LED flashlight Download PDFInfo
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- CN103687206A CN103687206A CN201310615514.3A CN201310615514A CN103687206A CN 103687206 A CN103687206 A CN 103687206A CN 201310615514 A CN201310615514 A CN 201310615514A CN 103687206 A CN103687206 A CN 103687206A
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- circuit
- led
- power supply
- drive circuit
- led flashlight
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Abstract
The invention relates to an LED flashlight comprising a housing, an LED lamp, and a drive circuit. The LED flashlight is characterized in that the drive circuit is composed of a switching mode power supply circuit and a feedback circuit, the feedback circuit samples a load and performs duty ratio adjustment or frequency adjustment on pulse of the switching mode power supply circuit, and accordingly output of the switching mode power supply circuit is controlled. The LED flashlight has the advantages that the design is scientific and reasonable, the drive circuit has few devices and high reliability, and the cost is low.
Description
Technical field
The invention belongs to a kind of decorating lighting lamp, relate to a kind of high-power LED light source energy-saving lamp.
Background technology
LED wall lamp is again line style LED flood light etc., because its profile strip, also there is people that it is called to LED line lamp, mainly only to use for doing building decoration illumination, be used in addition sketching the contours the profile of heavy construction, traditional prior art is all with power supply of single configuration, and manufacture process bothers relatively, and use is the not easy-maintaining damaging.So make attendant's workload increase, the numerous prices of the similar LED light fixture of existing market kind are also relatively costly, the fail safe of using at product and all process imperfection in short problem the useful life of product, can not be fully and lifetime of LED match, lack a kind of deficiencies such as power supply of long service life.
Summary of the invention
The object of the invention is, for the deficiencies in the prior art, proposes a kind of LED flashlight.
LED flashlight of the present invention, comprises housing, LED lamp, drive circuit forms, and it is characterized in that: its drive circuit be by
switchthe such form of power circuit+feedback circuit forms, and after feedback circuit samples from load, switching circuit is carried out duty ratio adjustment or the frequency adjustment of pulse, to reach
control switchthe object of circuit output.Its drive circuit works principle: connect
power supplyafter, VT1 connects negative pole because of R1, and c1 both end voltage can not be suddenlyd change.VT1 (b) electrode potential is lower than the e utmost point, VT1 conducting, and VT2 (b) utmost point has electric current to flow into, VT2 is conducting also, and electric current to the e utmost point, flows back to power cathode through L, VT2 (c) utmost point from positive source, power supply charges to L, L storage power, and the self induction electromotive force on L is left positive right negative.Through the feedback effect of c1, VT1 base potential is lower than emitter current potential, VT1 penetration depth saturation condition, and while VT2 is penetration depth saturation condition, i.e. Ib>Ic/ β (β is multiplication factor) also.Along with the charging of power supply to c1, C1 both end voltage raises gradually, i.e. V
tI(b) electrode potential rises gradually, and Ib1 reduces gradually, and when Ib1<=Ic1/ β, VT1 exits saturation region, and VT2 also exits saturation region, and the charging current of L is reduced.Now the self induction electromotive force on .L is just becoming the left negative right side, through c1 feedback effect.VT1 base potential further rises, and VT1 ends rapidly, and VT2 also ends, and the energy of the upper storage of L discharges, and the supply voltage on luminous tube is added on L and has produced self induction electromotive force, and reaching boosts makes
lED is luminous.
The present invention's beneficial effect compared with prior art: have design science, reasonable, drive circuit simple Devices is few, reliability is strong, low cost and other advantages.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described, but embodiments of the present invention are not limited to this.
Fig. 1-circuit diagram.
In figure: C1 is capacitor, and D1 is diode, D2, D3, D4 is LED lamp, R1 is charge discharging resisting resistance.
Embodiment
As shown in Figure 1: C1 is capacitor, and D1 is diode, D2, D3, D4 is LED lamp, R1 is charge discharging resisting resistance.
LED flashlight of the present invention, comprises housing, LED lamp, drive circuit forms, and it is characterized in that: its drive circuit be by
switchthe such form of power circuit+feedback circuit forms, and after feedback circuit samples from load, switching circuit is carried out duty ratio adjustment or the frequency adjustment of pulse, to reach
control switchthe object of circuit output.Its drive circuit works principle: connect
power supplyafter, VT1 connects negative pole because of R1, and c1 both end voltage can not be suddenlyd change.VT1 (b) electrode potential is lower than the e utmost point, VT1 conducting, and VT2 (b) utmost point has electric current to flow into, VT2 is conducting also, and electric current to the e utmost point, flows back to power cathode through L, VT2 (c) utmost point from positive source, power supply charges to L, L storage power, and the self induction electromotive force on L is left positive right negative.Through the feedback effect of c1, VT1 base potential is lower than emitter current potential, VT1 penetration depth saturation condition, and while VT2 is penetration depth saturation condition, i.e. Ib>Ic/ β (β is multiplication factor) also.Along with the charging of power supply to c1, C1 both end voltage raises gradually, i.e. V
tI(b) electrode potential rises gradually, and Ib1 reduces gradually, and when Ib1<=Ic1/ β, VT1 exits saturation region, and VT2 also exits saturation region, and the charging current of L is reduced.Now the self induction electromotive force on .L is just becoming the left negative right side, through c1 feedback effect.VT1 base potential further rises, and VT1 ends rapidly, and VT2 also ends, and the energy of the upper storage of L discharges, and the supply voltage on luminous tube is added on L and has produced self induction electromotive force, and reaching boosts makes
lED is luminous.In accompanying drawing, boost
transformeravailable
electricity-saving lamp's
magnet ring, with the enamelled wire Double-wire parallel wound 20T of Φ 0.21MM, attention Same Name of Ends is not wanted wrong, and LED only meets 1-3 as required, adjusts R1 and makes LED the brightest, and total current is in 100MA.This torch front end is 5～8 high brightness
luminous tube, use 1～2 joint
battery.Owing to using super brightness, send out
light pipereason, luminous efficiency is very high, operating current is smaller, 5 torches of a joint No.5 cell are used in actual measurement, electric current only has 100mA left and right.The light of breaking forth night can reach 10 meters far away.Whole circuit is contained in the small flashlight of No. 5 batteries of a joint, very convenient and practical, very power saving.If use large capacity rechargeable battery, can use continuously tens hours.
Claims (1)
1. a LED flashlight, comprises housing, LED lamp, drive circuit forms, and it is characterized in that: its drive circuit be by
switchthe such form of power circuit+feedback circuit forms, and after feedback circuit samples from load, switching circuit is carried out duty ratio adjustment or the frequency adjustment of pulse, to reach
control switchthe object of circuit output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310615514.3A CN103687206A (en) | 2013-11-27 | 2013-11-27 | LED flashlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310615514.3A CN103687206A (en) | 2013-11-27 | 2013-11-27 | LED flashlight |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103687206A true CN103687206A (en) | 2014-03-26 |
Family
ID=50323102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310615514.3A Pending CN103687206A (en) | 2013-11-27 | 2013-11-27 | LED flashlight |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103687206A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201467523U (en) * | 2009-08-06 | 2010-05-12 | 中山市明华电器有限公司 | Power supply driving circuit of LED lamp |
| WO2012127844A1 (en) * | 2011-03-24 | 2012-09-27 | ローム株式会社 | Switching power source control circuit for driving light-emitting element, and light-emitting device and electronic apparatus using same |
-
2013
- 2013-11-27 CN CN201310615514.3A patent/CN103687206A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201467523U (en) * | 2009-08-06 | 2010-05-12 | 中山市明华电器有限公司 | Power supply driving circuit of LED lamp |
| WO2012127844A1 (en) * | 2011-03-24 | 2012-09-27 | ローム株式会社 | Switching power source control circuit for driving light-emitting element, and light-emitting device and electronic apparatus using same |
Non-Patent Citations (1)
| Title |
|---|
| CAI486: "《高亮度LED电路大全》", 《百度文库》, 26 April 2011 (2011-04-26), pages 1 - 2 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140326 |