CN204206529U - A kind of high efficiency extra small power non-isolated LED drive circuit - Google Patents

A kind of high efficiency extra small power non-isolated LED drive circuit Download PDF

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Publication number
CN204206529U
CN204206529U CN201420527359.XU CN201420527359U CN204206529U CN 204206529 U CN204206529 U CN 204206529U CN 201420527359 U CN201420527359 U CN 201420527359U CN 204206529 U CN204206529 U CN 204206529U
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CN
China
Prior art keywords
controller
type filter
source lead
high efficiency
drive circuit
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Expired - Fee Related
Application number
CN201420527359.XU
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Chinese (zh)
Inventor
苏松得
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GUANGDONG LIANGDE OPTOELECTRONICS TECHNOLOGY CO LTD
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GUANGDONG LIANGDE OPTOELECTRONICS TECHNOLOGY CO LTD
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Priority to CN201420527359.XU priority Critical patent/CN204206529U/en
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Publication of CN204206529U publication Critical patent/CN204206529U/en
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Abstract

The utility model embodiment discloses a kind of high efficiency extra small power non-isolated LED drive circuit, comprise rectification circuit, pi type filter, on-off controller, outputting inductance, described rectification circuit, pi type filter carries out rectifying and wave-filtering to input AC electricity, described on-off controller has drain lead D, source lead S, feed back input pin FB, bypass pin BP, described on-off controller drain lead D, source lead S is serially connected with on the output of described pi type filter, described bypass pin BP connects described source lead S by shunt capacitance, described outputting inductance is connected between the negative output terminal of described source lead S and described rectification circuit, fly-wheel diode is serially connected with between described outputting inductance and LED load.Adopt the utility model, by making on-off controller carry out work with the pattern of open loop, ensure that as load provides constant current, load current being exported and carries out energy supplement by each switch periods, do not need to adopt output filter capacitor, LED constant light emitting and without stroboscopic.

Description

A kind of high efficiency extra small power non-isolated LED drive circuit
Technical field
The utility model relates to a kind of LED drive circuit, particularly relates to a kind of high efficiency extra small power non-isolated LED drive circuit.
Background technology
LED has the advantages such as energy-conservation, long service life, driving voltage are low, is a kind of new green environment protection light source, is widely used among the various occasions such as reading lamp, flashlight, headlight for vehicles, baby spot, label, dome illumination, decoration bright lamp.
The LED drive circuit applied at present, be generally by civil power after over commutation, for minimizing EMC and current harmonics add power factor correction circuits, by right for the direct current voltage rise after rectification, then by pwm circuit isolation and amplifier, for obtaining comparatively galvanic current stream, isolation and amplifier end also add constant current constant voltage protective circuit, or in order to realize the comparatively high control precision of electric current, the isolation of primary and secondary limit have employed optocoupler, add use cost, and do not adopt its circuit output current control precision of optocoupler circuit poor, and detection resistance and more various device be have employed to output electric current measure, circuit is complicated, add circuit cost, circuit reliability is low.
Summary of the invention
The utility model embodiment technical problem to be solved is, provides a kind of high efficiency extra small power non-isolated LED drive circuit.Simply can realize high-efficiency constant-flow output by circuit structure.
In order to solve the problems of the technologies described above, the utility model embodiment provides a kind of high efficiency extra small power non-isolated LED drive circuit, comprise rectification circuit, pi type filter, on-off controller, outputting inductance, described rectification circuit carries out rectification to output AC electricity, described pi type filter carries out EMI filtering to rectification circuit, the MOSFET established in described on-off controller has, and there is drain lead D, source lead S, feed back input pin FB, bypass pin BP, described on-off controller drain lead D, source lead S is serially connected with on the output of described pi type filter, described bypass pin BP connects described source lead S by shunt capacitance, described outputting inductance is connected between the negative output terminal of described source lead S and described rectification circuit, fly-wheel diode is serially connected with between described outputting inductance and LED load.
Further, the feed back input pin FB of described on-off controller without input feedback, with fixed cycle ON operation.
Further, described fly-wheel diode is Ultrafast recovery diode or Schottky barrier diodes.
Further, described pi type filter is RC or LC filter.
Implement the utility model embodiment, there is following beneficial effect: carry out work by making on-off controller with the pattern of open loop, ensure that as load provides constant current, the electric current of load is exported and carries out energy supplement by each switch periods, do not need to adopt output filter capacitor, LED constant light emitting and without stroboscopic.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
With reference to the electrical block diagram of the present utility model shown in Fig. 1.
A kind of high efficiency extra small power non-isolated LED drive circuit of the utility model embodiment includes rectification circuit, pi type filter, on-off controller, outputting inductance.
Rectification circuit is rectifier bridge BR1, carries out rectification output to the civil power exported.
Pi type filter is RC or the LC filter carrying out EMI filtering into circuit, is preferably RC filter in the present embodiment, is made up of resistance RF2 and electric capacity C1, C2 of being parallel to resistance RF2 front stage.
The MOSFET established in on-off controller U1 has, and there is drain lead D, source lead S, feed back input pin FB, bypass pin BP, drain lead D, source lead S are serially connected with on the output of pi type filter, bypass pin BP connects described source lead S outputting inductance by shunt capacitance and is connected between the negative output terminal of source lead S and described rectification circuit, fly-wheel diode VD is serially connected with between outputting inductance L1 and LED load, the feed back input pin FB of on-off controller without input feedback, with fixed cycle ON operation.
Preferably, in order to improve efficiency of the present utility model, fly-wheel diode VD is Ultrafast recovery diode or Schottky barrier diodes, is preferably Schottky barrier diodes.
In the embodiment of the present invention, on-off controller U1 works in an open-loop manner, and no-output feedback, as constant-current LED driver, circuit limits function primarily of IC internal current, guarantee to the constant electric current of load, use the ON/OFF of current limit to control to adjust output current, this control changes the adaptability with inherence to any input voltage in whole working range.Owing to forever flowing into feedback pin without any electric current, device can, at each cycle ON operation, make electric current rise to current-limiting points.Peak current due to each switch periods is restricted and fixing, so the size that power output is inductance decides.In a continuous manner (CCM), more require that VD reverse recovery time is in claimed range, EMI characteristic is relatively good in the design of work.By each switch periods, energy supplement is carried out to output, does not therefore need output filter capacitor, LED constant light emitting and do not have stroboscopic.
Above disclosedly be only a kind of preferred embodiment of the utility model, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.

Claims (4)

1. a high efficiency extra small power non-isolated LED drive circuit, it is characterized in that, comprise rectification circuit, pi type filter, on-off controller, outputting inductance, described rectification circuit carries out rectification to output AC electricity, described pi type filter carries out EMI filtering to rectification circuit, the MOSFET established in described on-off controller has, and there is drain lead D, source lead S, feed back input pin FB, bypass pin BP, described on-off controller drain lead D, source lead S is serially connected with on the output of described pi type filter, described bypass pin BP connects described source lead S by shunt capacitance, described outputting inductance is connected between the negative output terminal of described source lead S and described rectification circuit, fly-wheel diode is serially connected with between described outputting inductance and LED load.
2. high efficiency extra small power non-isolated LED drive circuit according to claim 1, is characterized in that, the feed back input pin FB of described on-off controller without input feedback, with fixed cycle ON operation.
3. high efficiency extra small power non-isolated LED drive circuit according to claim 2, it is characterized in that, described fly-wheel diode is Ultrafast recovery diode or Schottky barrier diodes.
4. high efficiency extra small power non-isolated LED drive circuit according to claim 2, it is characterized in that, described pi type filter is RC or LC filter.
CN201420527359.XU 2014-09-15 2014-09-15 A kind of high efficiency extra small power non-isolated LED drive circuit Expired - Fee Related CN204206529U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420527359.XU CN204206529U (en) 2014-09-15 2014-09-15 A kind of high efficiency extra small power non-isolated LED drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420527359.XU CN204206529U (en) 2014-09-15 2014-09-15 A kind of high efficiency extra small power non-isolated LED drive circuit

Publications (1)

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CN204206529U true CN204206529U (en) 2015-03-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104302042A (en) * 2014-09-15 2015-01-21 广东良得光电科技有限公司 High-efficiency and ultralow-power non-isolated LED drive circuit
CN108811232A (en) * 2017-05-05 2018-11-13 东莞艾笛森光电有限公司 LED driving circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104302042A (en) * 2014-09-15 2015-01-21 广东良得光电科技有限公司 High-efficiency and ultralow-power non-isolated LED drive circuit
CN108811232A (en) * 2017-05-05 2018-11-13 东莞艾笛森光电有限公司 LED driving circuit
CN108811232B (en) * 2017-05-05 2020-04-07 东莞艾笛森光电有限公司 Light emitting diode driving circuit

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20150311

Termination date: 20210915