CN102255485A - Light-emitting diode (LED) reflector lamp power circuit - Google Patents
Light-emitting diode (LED) reflector lamp power circuit Download PDFInfo
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- CN102255485A CN102255485A CN2011101869415A CN201110186941A CN102255485A CN 102255485 A CN102255485 A CN 102255485A CN 2011101869415 A CN2011101869415 A CN 2011101869415A CN 201110186941 A CN201110186941 A CN 201110186941A CN 102255485 A CN102255485 A CN 102255485A
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Abstract
The invention discloses a light-emitting diode (LED) reflector lamp power circuit, which mainly comprises a power module and a corresponding peripheral circuit. The power circuit further comprises a magnetic bead, wherein the magnetic bead suppresses electromagnetic interference (EMI) and high transient current in the circuit. The LED reflector lamp power circuit can suppress the EMI, solve the problem of low electromagnetic compatibility (EMC) and simultaneously suppress the high transient current introduced by a capacitor.
Description
Technical field
The present invention relates to a kind of power driving circuit, be specifically related to a kind of LED shot-light power circuit.
Background technology
Superiority along with continuous maturation of the technology of LED and performance thereof obtains application more and more widely.For example utilize 8WLED shot-light (luminous flux is equivalent to original 50W Halogen lamp LED) to replace original Halogen lamp LED.But directly replace original Halogen lamp LED, in actual application, have following problem with the 8WLED shot-light:
(1) the EMC electromagnetic compatibility passes through than difficulty: because the space is little, element is few, the chip frequency height that Switching Power Supply adopts;
(2) poor compatibility of light fixture; Owing to be substitute products, the power supply of LED shot-light will adopt the power supply of interchange 20KHZ (different manufacturers the is slightly different) 12V that electronic transformer produced of former Halogen lamp LED; The problem of bringing is that the input end capacitor of 8W shot-light power supply is difficult to choose; little then flicker; big run into that Chang Wufa lights when containing protective circuit in the electronic transformer (owing to triggered the protective circuit of primary electron transformer, overcurrent (instantaneous large-current) protection or overtemperature protection) poor compatibility.In actual applications, it is also not necessarily just fine that those can be lighted, because he does not have protective circuit to have overcurrent or risk of overheating, their inside does not have protective circuit not embody.
At the problems referred to above, people generally adopt following solution:
Be suitable for the electronic transformer of most of brands well for the compatibility that makes product, at the capacity that guarantees to reduce under the prerequisite of not glimmering input capacitance as far as possible, but this has brought trouble to batch process again, because the difference of components and parts itself causes some lamp flicker, some lamp does not work; For making the Switching Power Supply volume little, can improve as far as possible Switching Power Supply frequency this brought problem for again the EMC electromagnetic compatibility.
The function that guarantees product no problem (promptly not glimmering) has only increasing electric capacity, and some lamp will can not use (overcurrent, overtemperature protection) behind the increasing electric capacity in some electronic transformer.Because electric capacity is excessive; charging current excessive trigger protection circuit of moment, electric capacity is big more obvious more, if capacitance is in critical localisation; often then can trigger overheating protection circuit after a while, so when selecting big electric capacity, can suppress the instantaneous large-current that big electric capacity is introduced again.
As from the foregoing, under how little and the prerequisite that quantity is few, guarantee that the compatibility of product is the problem that this area is needed solution badly at components and parts.
Summary of the invention
The present invention is directed to when utilizing the LED shot-light to replace Halogen lamp LED, it exists the power circuit can't perfect compatible problem, and a kind of LED shot-light power circuit is provided.This power circuit can the fine problem that solves EMC electromagnetic compatibility and light fixture compatibility.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of LED shot-light power circuit, described power circuit mainly is made up of power module and correspondent peripheral circuit, also includes a magnetic bead in the described power circuit, and described magnetic bead suppresses EMI and the instantaneous large-current in the circuit.
In optimum example of the present invention, the model of described magnetic bead is BLM41PG102SN1, and its impedance is 1000 ohm/100M, and equivalent d.c. resistance is 0.09 ohm.
The present invention increases a magnetic bead in power circuit, it is used for the components and parts that small-power switching power-supply suppresses EMI, is equivalent to a small resistor and an inductance series connection, and to high-frequency current, signal all has the good restraining effect.
Magnetic bead at first can play inhibitory action to EMI in the present invention, solves the problem of the difficult mistake of EMC, and the instantaneous large-current introduced of electric capacity has had the equivalent resistance of magnetic bead that corresponding inhibitory action is also arranged in addition.Select suitable magnetic bead can play the effect of inhibition equally.
Description of drawings
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is power circuit principle figure.
Fig. 2 is circuit theory diagrams of the present invention.
Fig. 3 is the EMCCe Shibaogao of circuit shown in Figure 1.
Fig. 4 is the EMCCe Shibaogao of circuit shown in Figure 2.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1, the power circuit that the present invention relates to comprises power module U1,6 capacitor C 1-C6,4 diode D1-D4, voltage stabilizing didoe D5, two resistance R 1-R2, inductance L 1 and two plug-in unit P1-P2.
Wherein power module U1 employing model is the chip of PT4115, and the SW pin of U1 connects the positive pole of voltage stabilizing didoe D5 and an end of inductance L 1, and the other end of inductance L 1 connects the pin 2 of plug-in unit P2; The CSN pin connects an end of resistance R 1 and the pin 1 of plug-in unit P2 respectively; The VIN pin of U1 connects the other end of the negative pole resistance R1 of voltage stabilizing didoe D5 respectively.
4 diode D1-D4 connect to form rectifier bridge successively, and this rectifier bridge connects plug-in unit P1, and are connected to the VIN pin of power module U1.Between this rectifier bridge and the power module U1 also successively and meet capacitor C 1-C6, and the capacitor C 1 that connects and C2 between series resistor R2.。
Resistance R 2 sizes are 0.5 ohm in the present invention, and resistance R 1 size is 0.18.
When the power circuit that such scheme forms is applied to the 8WLED shot-light, also there is the problem of EMC electromagnetic compatibility and overcurrent poor compatibility.For addressing this problem, the present invention is proposing a kind of improvement project again on the basis of such scheme: add magnetic bead in above-mentioned power circuit.
Referring to Fig. 2, magnetic bead L2 is serially connected between capacitor C 3 and the C4, and itself and components and parts are constant, and connected mode is not given unnecessary details with above-mentioned consistent herein.
Magnetic bead L2 model is BLM41PG102SN1 in the present invention, and its impedance is 1000 ohm/100M, and equivalent d.c. resistance is 0.09 ohm.Can effectively solve by this magnetic bead and to utilize the 8WLED shot-light to replace the EMC electromagnetic compatibility that original Halogen lamp LED exists and the problem of overcurrent compatibility, as described below:
Referring to Fig. 3, this figure is depicted as the EMCCe Shibaogao of the power circuit (being power circuit shown in Figure 1) of not introducing magnetic bead, and pk among this figure (PEAK) is meant peak value (peak in the unit interval).QP (QUASI-PEAK) is meant quasi-peak value (stipulate allowed the peak value upper limit) in EN55015.AV (AVERAGE) is a mean value).The EMC test peak value permissible value that is above standard in 400K～600K scope as we know from the figure, EMC can not pass through.
Referring to Fig. 4, this figure is depicted as the EMCCe Shibaogao of the power circuit (being power circuit shown in Figure 2) of introducing magnetic bead, and pk among this figure (PEAK) is meant peak value (peak in the unit interval).QP (QUASI-PEAK) is meant quasi-peak value (stipulate allowed the peak value upper limit) in EN55015.AV (AVERAGE) is a mean value).From this figure as can be known, EMC test peak value obviously is suppressed in the scope of standard permission in 400K～600K scope, and EMC can pass through.
This shows, can play inhibitory action to the EMI in the circuit, effectively solve the problem that the EMC difficulty is passed through by introducing magnetic bead.
Moreover power circuit shown in Figure 1 is when practical application, and the crest voltage V=1.86V at resistance R 2 two ends owing to resistance R 2=0.5 Ω, then passes through the peak current I=V/R2=3.72A of R2.
And in the power circuit shown in Figure 2 owing to introduce magnetic bead, the crest voltage V=1.34V at its resistance R 2 two ends because resistance R 2=0.5 Ω, the peak current I=V/R2=2.68A by R2 then.
This shows, can effectively suppress the instantaneous large-current that electric capacity is introduced by introducing magnetic bead.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (2)
1. LED shot-light power circuit, described power circuit mainly is made up of power module and correspondent peripheral circuit, it is characterized in that, also includes a magnetic bead in the described power circuit, and described magnetic bead suppresses EMI and the instantaneous large-current in the circuit.
2. a kind of LED shot-light power circuit according to claim 1 is characterized in that the model of described magnetic bead is BLM41PG102SN1, and its impedance is 1000 ohm/100M, and equivalent d.c. resistance is 0.09 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101869415A CN102255485A (en) | 2011-07-05 | 2011-07-05 | Light-emitting diode (LED) reflector lamp power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101869415A CN102255485A (en) | 2011-07-05 | 2011-07-05 | Light-emitting diode (LED) reflector lamp power circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102255485A true CN102255485A (en) | 2011-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101869415A Pending CN102255485A (en) | 2011-07-05 | 2011-07-05 | Light-emitting diode (LED) reflector lamp power circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6541926B1 (en) * | 1999-02-03 | 2003-04-01 | Antonio Forghieri | Electronically controlled, power saving, power supply system for fluorescent tubes |
| CN2689106Y (en) * | 2004-01-16 | 2005-03-30 | 广东新的科技集团有限公司 | Control system for wire box of air cooling tubular apparatus |
| CN201616937U (en) * | 2009-12-30 | 2010-10-27 | 谢冬荣 | Power circuit of four 1W LED spot lights |
-
2011
- 2011-07-05 CN CN2011101869415A patent/CN102255485A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6541926B1 (en) * | 1999-02-03 | 2003-04-01 | Antonio Forghieri | Electronically controlled, power saving, power supply system for fluorescent tubes |
| CN2689106Y (en) * | 2004-01-16 | 2005-03-30 | 广东新的科技集团有限公司 | Control system for wire box of air cooling tubular apparatus |
| CN201616937U (en) * | 2009-12-30 | 2010-10-27 | 谢冬荣 | Power circuit of four 1W LED spot lights |
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Application publication date: 20111123 |