CN104995994A - Multimode light-emitting diode driver - Google Patents

Multimode light-emitting diode driver Download PDF

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Publication number
CN104995994A
CN104995994A CN201280076852.8A CN201280076852A CN104995994A CN 104995994 A CN104995994 A CN 104995994A CN 201280076852 A CN201280076852 A CN 201280076852A CN 104995994 A CN104995994 A CN 104995994A
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CN
China
Prior art keywords
rectifier
circuit
switch
electric capacity
inductance
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Application number
CN201280076852.8A
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Chinese (zh)
Inventor
黄向鹏
康霞光
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Huanya Environmental Protection Technology Shanghai Co ltd
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Huanya Environmental Protection Technology Shanghai Co ltd
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Publication of CN104995994A publication Critical patent/CN104995994A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

A multimode light-emitting diode driver, comprising: a rectifier and filter circuit (101), a power supply control circuit (102), first to fourth auxiliary circuits (103, 104, 105, 106), and a selector switch group (107). Two input ends of a rectifier are connected to alternating current mains electricity, and a dimmer (110) is connected between the alternating current mains electricity and a positive input end of the rectifier. Two input ends of the filter circuit are connected to two output ends of the rectifier. The power supply control circuit (102) comprises a transformer and a power conversion controller (201). The first to fourth auxiliary circuits (103, 104, 105, 106) are designed to have different properties, and are optionally added into the circuit via the selector switch group (107), so that the circuit has the characteristics of high efficiency, good compatibility, and a wide dimming range.

Description

Multimode light-emitting diode driver
Multi-mode LED drive technical field
The present invention relates to LED driving circuit, more particularly, to a kind of multi-mode LED drive.Background technology
Light emitting diode (LED) viable commercial product, various technological difficulties have obtained effective solution.With the light fixture extensive use using light emitting diode as light source, LED lamp starts to replace incandescent light source with it in terms of source benefit, life-span and stability in a lot of application.But compatibility issue much relevant with light adjusting system is found during substitution, common failure is narrow for dimming scope, flicker etc..
The light-dimming method of conventional incandescent lights is relatively simple.Light modulator is series between power supply and load, by phase control technology, makes light modulator built-in switch with fixing angle relationship conducting into one according to AC power phase and turning off.
Phase dimming is divided to two classes, preceding cut position and rear cut position.Preceding cut position mode is：Dimmer switch is held off in after alternating current zero passage, it is open-minded after one section of adjustable delay, switch keeping is turned on, until the next zero crossing shut-off of AC power, switching sequence is repeated twice per civil power power frequency period, delay is shorter, and ON time is longer, and supply load effective power is bigger.Cut position mode is afterwards：Dimmer switch is begun to turn on by civil power power frequency zero crossing, is turned off after one section of adjustable delay, switch keeping shut-off, until the next zero crossing of AC power is open-minded.Controllable silicon, simple structure are used the mode of preceding cut position more, but being disturbed larger.Cut position mode uses diode and single-chip microcomputer afterwards, and construction is complicated, but signal is clean.
Because phase dimmer emerges for a long time on the market, add up that the style that gets off is a lot, be not that every money light modulator can be adapted to LED illumination System and use originally for the thinking that tengsten lamp and Halogen lamp LED are designed.These substantial amounts of light modulators are expensive due to its, are impermissible for arbitrarily replacing, therefore user wishes that LED lamp can coordinate existing various light modulators to use.
Asked to meet these, the product of phase dimming signal transacting can be received by having diode chip for backlight unit producer to be proposed one by one, and some additional functionalities are provided and ensure that phase dimmer is in stable working condition.These functions include：LED information display system maintains the controllable silicon in phase dimmer to work when maintaining controllable silicon electric current in debugging underpower there is provided weak current, it is to avoid allow it to turn off and cause LED to flash. Because LED belongs to the illuminator of energy-conservation, the weak current of the above and fictitious load belong to sacrifice energy-saving efficiency to reach the stability of system.But because the species of phase dimmer is various, the degree required for weak current, fictitious load is also inconsistent.Some is set in needs and takes into account energy-conservation and reach that perfect effect is very difficult in numerous light modulators.So many producers all select to abandon energy-saving efficiency, it is target that the numerous light modulators of matching are reached as far as possible.
Weak current and fictitious load are added in addition, can also change the phase of input, cause LED can not debug such as tengsten lamp Halogen lamp LED very dark dimming effect.This causes the LED driver having on the market to debug maximum mostly（100%) to minimum (20%).But due to human eye in the case of low-light level it is more sensitive, it is overall still to feel very bright therefore to during the minimum light modulation settings of 20 %.General tengsten lamp Halogen lamp LED can all be transferred to 0.1 %.The content of the invention
The technical problems to be solved by the invention are to provide a kind of multi-mode LED driver, to take into account performances of the LED in terms of stability, energy-conservation and dimming behavior.
The present invention is to propose a kind of multi-mode LED drive to solve the technical scheme that above-mentioned technical problem is used, including rectifier, filter circuit, power control circuit, first to fourth auxiliary circuit and selecting switch group.Two input incoming transport civil powers of the rectifier, and it is connected between electric main and the positive input terminal of the rectifier light modulator.Two inputs of the filter circuit connect two output ends of the rectifier.Power control circuit includes a transformer, a power conversion controller, the transformer has primary side winding, primary side winding and assists winding, one end of the primary side winding connects an output end of the filter circuit, the other end of the primary side winding connects the power conversion controller, one end of the assists winding connects another output end and the power conversion controller of the filter circuit, and the other end of the assists winding connects the power conversion controller.First auxiliary circuit includes the first RC circuits and the 2nd RC circuits, is optionally coupled to respectively between two output ends of the rectifier.Second auxiliary circuit includes 3rd resistor and the 4th resistance, is optionally coupled to respectively between the light modulator and the positive input terminal of the rectifier.3rd auxiliary circuit includes the first inductance and the second inductance, is optionally coupled to respectively between the light modulator and the positive input terminal of the rectifier.4th auxiliary circuit includes the 3rd electric capacity and the 4th electric capacity, is optionally coupled to respectively between two output ends of the rectifier.Selecting switch group includes：First switch, second switch, respectively with the first RC circuits and the 2nd RC circuit connected in series, to provide the optional connection of the first RC circuits and the 2nd RC circuits； 3rd switch and the 4th switch, respectively with the 3rd resistor and the 4th resistant series, to provide the optional connection of the 3rd resistor and the 4th resistance；5th switch and the 6th switch, connect with first inductance and second inductance, to provide the optional connection of first inductance and second inductance respectively；7th switch and the 8th switch, connect with the 3rd electric capacity and the 4th electric capacity, to provide the optional connection of the 3rd electric capacity and the 4th electric capacity respectively.
In one embodiment of this invention, the first RC circuits include first resistor and the first electric capacity being serially connected.
In one embodiment of this invention, the 2nd RC circuits include second resistance and the second electric capacity being serially connected.
In one embodiment of this invention, the light modulator is phase dimmer.
In one embodiment of this invention, the phase dimmer is frontier phase light modulator.
In one embodiment of this invention, the phase dimmer is reverse phase light modulator.
In one embodiment of this invention, the rectifier is bridge rectifier.
The present invention is due to using above technical scheme, it is allowed to compared with prior art, various characteristics are introduced by multiple auxiliary circuits, such as compatibility, stability and big dimming scope, select these characteristics to add in traditional LED driver using switch so as to allow user, reach preferable dimming effect.Summary of drawings
Feature, the performance of the present invention is further described by following embodiment and its accompanying drawing.
Fig. 1 shows the circuit block diagram of the LED driver of one embodiment of the invention.
Fig. 2 shows the circuit diagram of the original circuit and power control circuit in Fig. 1.
Fig. 3 shows the circuit diagram of the power control circuit of the first auxiliary circuit comprising one embodiment of the invention.Fig. 4 shows the circuit diagram of the power control circuit of the second auxiliary circuit comprising one embodiment of the invention.Fig. 5 shows the circuit diagram of the power control circuit of the 3rd auxiliary circuit comprising one embodiment of the invention.Fig. 6 shows the circuit diagram of the power control circuit of the 4th auxiliary circuit comprising one embodiment of the invention.The preferred forms of the present invention
Summarily say, The embodiment provides the pattern of plurality of optional, to allow LED driver to take into account multi-effect, for example improve as far as possible efficiency, the phase dimmer of the numerous styles of matching and Dimming scope is tried one's best greatly.
Fig. 1 shows the circuit block diagram of the LED driver of one embodiment of the invention.Shown in reference picture 1, LED drivers 100 include rectification and filter circuit 101, power control circuit 102, the first auxiliary circuit 103, the second auxiliary circuit 104, the 3rd auxiliary circuit 105, the 4th auxiliary circuit 106 and selecting switch group 107.Selecting switch group may include multiple switch, and first to fourth auxiliary circuit 103- 106 is connected in power control circuit 102 by respective switch respectively.
The input of the input receiving phase light modulator 1 10 of LED driver 100.The output end output driving current of LED driver 100 is to LED illumination module 120.In actual fabrication, LED driver 100 can be integrated together with LED illumination module 120, as LED lamp, to replace the conventional light sources such as incandescent lamp, and the existing phase dimmer of these compatible conventional light sources.
Fig. 2 shows the rectification in Fig. 1 and the circuit diagram of filter circuit 101 and power control circuit 102.Shown in reference picture 2, rectification and filter circuit 101 include rectifier BR, diode D, electric capacity C3, C4 and inductance L3 in circuit.Wherein, electric capacity C3, C4 and inductance L3 compositions π type filter circuits.Power control circuit 102 includes power conversion controller 201, high frequency transformer Τ Χ, diode D5, feedback control circuit 202, electric capacity C5 and optocoupler U.Specifically the course of work is：Civil power is after light modulator 1 10, fuse F 1, become direct current after rectification, pass through C3, after the π type filter circuits of L3, C4 composition, by transformer Τ Χ, power conversion controller 201, corresponding high-frequency ac output voltage is obtained, obtain DC voltage by diode D5 rectifications, after electric capacity C5 filtering powers to LED lamp.The corresponding overvoltage protection of this circuit, overcurrent protection function feed back to the power conversion controller 201 of transformer primary to realize by feedback control circuit 202 and optocoupler U.Rectifier BR can be bridge rectifier, and it is for example constituted by a diode.
Above-mentioned circuit is efficient and dimming scope is big, but the weak current that its cost is to provide, and fictitious load is minimum, or even nothing.This circuit is only suitable for the preceding phase-cut dimmer or good rear phase-cut dimmer of high-quality.
Fig. 3 shows the circuit diagram of the power control circuit of the first auxiliary circuit comprising one embodiment of the invention.Shown in reference picture 3, the first auxiliary circuit 103 includes resistance Rl, R2, and electric capacity C l, C2, wherein resistance Rl, electric capacity C I constitute RC circuits all the way, and resistance R2, electric capacity C2 constitute another road RC circuits.Two-way RC circuits are respectively added in the circuit behind rectifier BR by two switches SW1, SW2 of selecting switch group 107.The alternative model of first auxiliary circuit 103 is that RC circuits do not work, wherein all the way RC works or two road RC work, so as to match different dimmer operations, the maintenance electric current and conducting electric current for meeting its requirement is provided for corresponding light modulator, the flicker of the abnormal appearance of dimmer operation is avoided with this and turns off situation in advance.
Fig. 4 shows the circuit diagram of the power control circuit of the second auxiliary circuit comprising one embodiment of the invention.Shown in reference picture 4, the second auxiliary circuit 104 includes resistance R3, R4, is connected in series to respectively between light modulator 110 and rectifier BR.Two-way resistance is respectively connected in series in circuit by two switches SW3, SW4 of selecting switch group 107.Two resistance R3, R4 have different resistance values.In this embodiment, the corresponding resistor resistance matched with it can be selected by switching, the pattern that can be selected is according to corresponding light modulator characteristic：Wherein any one resistant series incoming transport circuit or be to access alternating current circuit after two resistor coupled in parallel.For such mode, the maintenance electric current and conducting electric current of corresponding light modulator can not only be improved, and certain inhibitory action can be played for the overshoot current of Switching Power Supply booting moment, it is not only that light modulator provides corresponding steady operation electric current, and improves the functional reliability of whole power-supply system.
Fig. 5 shows the circuit diagram of the power control circuit of the 3rd auxiliary circuit comprising one embodiment of the invention.Shown in reference picture 5, the 3rd auxiliary circuit 105 includes inductance Ll, L2, is connected in series to respectively between light modulator 110 and rectifier BR.Two-way inductance is respectively connected in series in circuit by two switches SW5, SW6 of selecting switch group 107.Two inductance Ll, L2 have different inductance values.In this embodiment, the corresponding inductance matched with it can be selected by switching according to corresponding light modulator characteristic, the pattern that can be selected is：Wherein any one inductance series connection accesses alternating current circuit.According to inductance equiva lent impedance Z=Q L, utilize its corresponding equiva lent impedance, enough maintenance electric current and conducting electric current can be not only provided for corresponding light modulator, and conduction and radiation inhibition of its inductance characteristic for whole power supply are had than larger lifting.
Fig. 6 shows the circuit diagram of the power control circuit of the 4th auxiliary circuit comprising one embodiment of the invention.Shown in reference picture 6, the 4th auxiliary circuit 106 includes electric capacity C7, C8.Two-way electric capacity is respectively added in the circuit behind rectifier BR by two switches SW7, SW8 of selecting switch group 107.In one embodiment, control whether electric capacity C7, C8 are accessed in circuit respectively by switching SW7, SW8, to control whether circuit enters relevant work pattern.According to capacitor equivalent impedance Z=1/, " C, when capacitance is bigger, equiva lent impedance is smaller, when operating voltage is constant, and the phase induced current that it is produced is bigger, also improves maintenance electric current and conducting electric current numerical value when light modulator 110 is accessed.Selected by different switches, the mode of operation matched with corresponding light modulator can be selected, and for whole light adjusting system, variable capacitance, numerous light modulators are not only have matched, the compatible maximization of dimming behavior is realized, and equally can be to total system Conduction and radiation inhibition can be more preferable.Another benefit that this auxiliary circuit 106 is brought is will significantly to extend overall working life.After parallel connection accesses more electric capacity, the comparatively temperature rise of each electric capacity can be reduced accordingly, so that its working life can accordingly extend, also extend the working life of whole light adjusting system.
Above-mentioned multiple auxiliary circuit 103-106 can be partly or entirely provided in LED driver 100, user can utilize the selecting switch group 107 provided during use, the pattern needed is selected, turns off or on required auxiliary circuit to reach preferable dimming effect.
Although the present invention is described with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, embodiment above is intended merely to the explanation present invention, various equivalent change or replacement can be also made in the case of without departing from spirit of the invention, therefore, as long as change, modification to above-described embodiment in the spirit of the present invention will all fall in the range of following claims.

Claims (7)

  1. Claim
    1. a kind of multi-mode LED drive, including：
    Rectifier, two input incoming transport civil powers of the rectifier, and it is connected between electric main and the positive input terminal of the rectifier light modulator；
    Filter circuit, two inputs of the filter circuit connect two output ends of the rectifier；
    Power control circuit, it includes a transformer, a power conversion controller, the transformer has primary side winding, primary side winding and assists winding, one end of the primary side winding connects an output end of the filter circuit, the other end of the primary side winding connects the power conversion controller, one end of the assists winding connects another output end and the power conversion controller of the filter circuit, and the other end of the assists winding connects the power conversion controller；
    First auxiliary circuit, including the first RC circuits and the 2nd RC circuits, are optionally coupled between two output ends of the rectifier respectively；
    Second auxiliary circuit, including 3rd resistor and the 4th resistance, are optionally coupled between the light modulator and the positive input terminal of the rectifier respectively；
    3rd auxiliary circuit, including the first inductance and the second inductance, are optionally coupled between the light modulator and the positive input terminal of the rectifier respectively；
    4th auxiliary circuit, including the 3rd electric capacity and the 4th electric capacity, are optionally coupled between two output ends of the rectifier respectively；
    Selecting switch group, including：First switch, second switch, respectively with the first RC circuits and the 2nd RC circuit connected in series, to provide the optional connection of the first RC circuits and the 2nd RC circuits；3rd switch and the 4th switch, respectively with the 3rd resistor and the 4th resistant series, to provide the optional connection of the 3rd resistor and the 4th resistance；5th switch and the 6th switch, connect with first inductance and second inductance, to provide the optional connection of first inductance and second inductance respectively；7th switch and the 8th switch, connect with the 3rd electric capacity and the 4th electric capacity, to provide the optional connection of the 3rd electric capacity and the 4th electric capacity respectively.
    2. multi-mode LED drive as claimed in claim 1, it is characterised in that the first RC circuits include first resistor and the first electric capacity being serially connected.
    3. multi-mode LED drive as claimed in claim 1, it is characterised in that the 2nd RC Circuit includes the second resistance being serially connected and the second electricity
    The pole pipe drivers 4. multi-mode as claimed in claim 1 lights, it is characterised in that the light modulator is phase dimmer.
    The pole pipe drivers 5. multi-mode as claimed in claim 4 lights, it is characterised in that the phase dimmer is frontier phase light modulator.
    The pole pipe drivers 6. multi-mode as claimed in claim 4 lights, it is characterised in that the phase dimmer is reverse phase light modulator.
    The pole pipe drivers 7. multi-mode as claimed in claim 1 lights, it is characterised in that the rectifier is bridge rectifier.
CN201280076852.8A 2012-11-05 2012-11-05 Multimode light-emitting diode driver Pending CN104995994A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2012/084064 WO2014067155A1 (en) 2012-11-05 2012-11-05 Multimode light-emitting diode driver

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Publication Number Publication Date
CN104995994A true CN104995994A (en) 2015-10-21

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CN (1) CN104995994A (en)
HK (1) HK1212851A1 (en)
WO (1) WO2014067155A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105282934A (en) * 2015-10-30 2016-01-27 上海路千电子科技有限公司 Linear constant-current LED driving circuit and method compatible with SCR light modulator

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8203276B2 (en) * 2008-11-28 2012-06-19 Lightech Electronic Industries Ltd. Phase controlled dimming LED driver system and method thereof
CN201657406U (en) * 2010-01-05 2010-11-24 英飞特电子（杭州）有限公司 Circuit for improving silicon controlled dimmer to be suitable for capacitive load
TW201141303A (en) * 2010-05-07 2011-11-16 Light Engine Ltd Triac dimmable power supply unit for LED
CN102143636A (en) * 2011-03-14 2011-08-03 苏州达方电子有限公司 Light-emitting diode driving device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105282934A (en) * 2015-10-30 2016-01-27 上海路千电子科技有限公司 Linear constant-current LED driving circuit and method compatible with SCR light modulator
CN105282934B (en) * 2015-10-30 2018-02-13 上海路千电子科技有限公司 The linear constant current LED drive circuit and method of a kind of compatible silicon controlled light modulator

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Publication number Publication date
HK1212851A1 (en) 2016-06-17
WO2014067155A1 (en) 2014-05-08

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