CN203492228U - LED (Light Emitting Diode) driving device - Google Patents

LED (Light Emitting Diode) driving device Download PDF

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Publication number
CN203492228U
CN203492228U CN201320563168.4U CN201320563168U CN203492228U CN 203492228 U CN203492228 U CN 203492228U CN 201320563168 U CN201320563168 U CN 201320563168U CN 203492228 U CN203492228 U CN 203492228U
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CN
China
Prior art keywords
emitting diode
electrically connected
light
unit
light emitting
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Expired - Fee Related
Application number
CN201320563168.4U
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Chinese (zh)
Inventor
陈建宏
林哲宇
徐玮志
李忠树
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Chicony Power Technology Co Ltd
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Chicony Power Technology Co Ltd
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Priority to CN201320563168.4U priority Critical patent/CN203492228U/en
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Abstract

The utility model provides an LED (Light Emitting Diode) driving device, which is electrically connected to a voltage source and an LED serial interface; the LED driving device comprises a constant-voltage output module, a rectifying unit and a constant-current control unit; the constant-voltage output module is electrically connected to the voltage source; the constant-voltage output module comprises a switching unit, a resonant unit, a conversion unit and a power balancing unit; the resonant unit is electrically connected to the switching unit; the conversion unit comprises a primary winding, a first secondary winding and a second secondary winding; the primary winding is electrically connected to the resonant unit; the power balancing unit comprises a balancing transformer; the balancing transformer comprises a balancing coil; the balancing coil is electrically connected to the first secondary winding; the rectifying unit is electrically connected to the power balancing unit and the LED serial interface; and the constant-current control unit is electrically connected to the second secondary winding and the LED serial interface.

Description

Light emitting diode drive device
Technical field
The utility model relates to a kind of drive unit, especially relates to a kind of drive unit of light-emitting diode.
background technology
Flat display, for example, be liquid crystal indicator, because having the advantages such as high image quality, volume be little, lightweight, become the main flow of display unit.For further reaching the feature of low consumpting power, at present more while using the little light-emitting diode (Light Emitting Diode, LED) of power consumption to replace traditional incandescent lamp tube or fluorescent tube to show as flat display required light source provide.
Light-emitting diode is a kind of low-voltage asymmetrical circuit element of current drives, the luminous flux that adds light-emitting diode itself changes to some extent along with flowing through the electric current of this light-emitting diode, therefore luminous for what make that flat display can uniform luminance, must provide a constant current source to supply with serial or the array being formed by light-emitting diode, make its brightness reach consistency.Existing is mainly certain current element of connecting in each light-emitting diode serial in order to the LED driving circuit of light-emitting diode serial constant current source to be provided, it is for example current mirror, yet this circuit framework certainly will increase and become huge because of the quantity of light-emitting diode serial, therefore, how effectively to stablize conducting to the electric current of light-emitting diode serial and make to reach consistent by the electric current of all light-emitting diode serials, the circuit framework (or volume) that simultaneously reaches reduction light emitting diode drive device, becomes art technology people problem demanding prompt solution.
utility model content
Described in prior art, a technical approach of the present utility model, be to provide a kind of light emitting diode drive device, described light emitting diode drive device, in order to provide stabling current and electric current to give light-emitting diode serial, makes the brightness of light-emitting diode serial consistent.
One execution mode of this technical approach provides a kind of light emitting diode drive device, described light-emitting diode assembly is electrically connected on a voltage source and a plurality of light-emitting diode serial, and light emitting diode drive device comprises certain voltage output module, a rectification unit and certain current control unit.Determine Voltage-output module and be electrically connected on voltage source, describedly determine Voltage-output module and comprise a switch unit, a resonant element, a converting unit and a power balance unit; Resonant element is electrically connected on switch unit, and converting unit comprises an armature winding, two the first secondary winding and a second subprime winding, and armature winding is electrically connected on resonant element.Power balance unit comprises a balancing transformer, and described balancing transformer comprises two balance coils, and balance coil is electrically connected on the first secondary winding.Rectification unit is electrically connected on power balance unit and light-emitting diode serial.Determine current control unit and be electrically connected on this second subprime winding and light-emitting diode serial.
In other execution mode of the utility model, to determine current control unit and comprise a driving element and a power conversion circuit, driving element is electrically connected on light-emitting diode serial, and power conversion circuit is electrically connected on driving element and second subprime winding.
In other execution mode of the utility model, power balance unit also comprises two balanced capacitors, and balanced capacitor is electrically connected on the first secondary winding and rectification unit, and balanced capacitor, the first secondary winding and balance coil are and are connected in series.
In other execution mode of the utility model, light emitting diode drive device also comprises a controller, is electrically connected on second subprime winding and switch unit, and controller is controlled the switching frequency of switch unit.
In other execution mode of the utility model, light emitting diode drive device also comprises a plurality of capacitor for voltage protections, and capacitor for voltage protection is parallel to light-emitting diode serial.
In other execution mode of the utility model, rectification unit comprises two the first rectifiers and one second rectifier, and the first rectifier is electrically connected on respectively the first secondary winding and light-emitting diode serial, and the second rectifier is electrically connected on second subprime winding.
In other execution mode of the utility model, light emitting diode drive device also comprises a level Detection capacitance device, is electrically connected on the second rectifier.
In other execution mode of the utility model, balance coil has the identical number of turn.
In other execution mode of the utility model, resonant element comprises a resonant capacitor, a resonant inductor and a magnetizing inductance device, resonant capacitor, resonant inductor and magnetizing inductance device are and are electrically connected in series, the parallel connection of magnetizing inductance device is electrically connected on armature winding, and magnetizing inductance device is electrically connected on resonant inductor.
In other execution mode of the utility model, switch unit comprises two switching devices, is electrically connected on controller, the switching frequency of controller modulation switching device.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the light emitting diode drive device of the utility model the first execution mode;
Fig. 2 is the circuit diagram of the light emitting diode drive device of the utility model the first execution mode.
Reference numeral
1: light emitting diode drive device 10: switch unit
100: switching device 11: controller
12: resonant element 120: resonant capacitor
122: resonant inductor 124: magnetizing inductance device
14: converting unit 140: armature winding
Within 142: the first, secondary winding 144: second subprime winding
15: level Detection capacitance device 16: rectification unit
Within 160: the first, rectifier 161,163: diode
Within 162: the second, rectifier 18: power balance unit
180: balancing transformer 182: balanced capacitor
184: balance coil 20: determine current control unit
200: driving element 202: power conversion circuit
22: capacitor for voltage protection 3: light-emitting diode serial
30: light-emitting diode 4: determine Voltage-output module
VIN: voltage source
Embodiment
Please refer to accompanying drawing, above and extra object, feature and advantage of the present utility model are by the following illustrative by better embodiment of the present utility model and non-limitingly describe better and understand in detail.
Coordinating and consult Fig. 1, is the circuit block diagram of light emitting diode drive device of the present utility model.Light emitting diode drive device 1 is electrically connected on a plurality of light-emitting diode serials 3, in order to drive light-emitting diode serial 3 to emit beam.Light emitting diode drive device 1 comprises certain voltage output module 4, a rectification unit 16 and certain current control unit 20, determine Voltage-output module 4 in order to constant voltage output to be provided, to stablize conducting to the voltage of light-emitting diode serial 3, determine current control unit 20 in order to constant current output to be provided, make light-emitting diode serial 3 be able to the luminous of uniform luminance.
Coordinating and to consult Fig. 2, is the circuit diagram of the light emitting diode drive device of the utility model the first execution mode.Light emitting diode drive device 1 is electrically connected on a voltage source V IN and light-emitting diode serial 3, and described voltage source V IN is direct voltage source.Light-emitting diode serial 3 comprises a plurality of light-emitting diodes 30, and described light-emitting diode 30 is and is connected in series.In the present embodiment, the quantity of light-emitting diode serial 3 is usingd three groups as being illustrated as example.Light-emitting diode 30 can be for example LED crystal particle or LED package, and LED crystal particle is comprised of a plurality of semiconductor layer, and LED package coated light-transmissive resin material or fluorescence coating in aforementioned LED crystal particle.Light emitting diode drive device 1, in order to drive light-emitting diode serial 3, makes light-emitting diode 30 uniform luminance ground luminous.
Determine Voltage-output module 4 and comprise a switch unit 10, a resonant element 12, a converting unit 14 and a power balance unit 18.Switch unit 10 is electrically connected on voltage source V IN, and resonant element 12 is electrically connected on switch unit 10, and converting unit 14 is electrically connected on resonant element 12, and power balance unit 18 is electrically connected on converting unit 14.Rectification unit 16 is electrically connected on power balance unit 18, determines current control unit 20 and light-emitting diode serial 3.
Switch unit 10 is in order to be switching to pulsating direct current signal by voltage source V IN.In the present embodiment, the semi-bridge switching circuit of switch unit 10 for comprising two switching devices 100, and switching device 100 for example (but not limiting) is mos field effect transistor (metal-oxide-semiconductor field-effect transistor, MOSEFT).When reality is implemented, switch unit 10 can be also full-bridge switching circuit, and arranges in pairs or groups and use other to have the power switch of handoff functionality, for example igbt (insulated gate bipolar transistor, IGBT).Switch unit 10 is electrically connected on a controller 11, and controller 11 is in order to control the switching frequency of switching device 100.
Resonant element 12 is electrically connected between switching device 100, with switching device 100 alternate conduction and cut-off time receive pulsating direct current signal, and carry out voltage modulation according to the frequency of the pulsating direct current signal of switch unit 100 outputs, with stable output voltage.Resonant element 12 comprises a resonant capacitor 120, resonant inductor 122 and a magnetizing inductance device 124, resonant capacitor 120 is electrically connected in series in resonant inductor 122, magnetizing inductance device 124 is parallel to an armature winding 140 of converting unit 14, and magnetizing inductance device 124 is electrically connected on resonant inductor 122 simultaneously.Resonant capacitor 120 is in order to intercept the direct current composition of DC pulse signal, and forms resonant circuits with resonant inductor 122.In the present embodiment, magnetizing inductance device 124 is implemented as external inductor as shown in Figure 2, and during actual enforcement, magnetizing inductance device 124 can be also the magnetizing inductance of converting unit 14.
Converting unit 14 comprises armature winding 140, two the first secondary winding 142 and second subprime windings 144.Armature winding 140 is electrically connected on resonant element 12, in order to convert electrical energy into magnetic energy, and magnetic energy is passed to the first secondary winding 142 and second subprime winding 144.The first secondary winding 142 and second subprime winding 144 are converted to electric energy by magnetic energy, to reach, boost or the function of step-down.The first secondary winding 142 has the identical number of turn, and the number of turn of second subprime winding 144 can be same as the number of turn of the first secondary winding 142, or the number of turn of second subprime winding 144 can not be same as the number of turn of the first secondary winding 142.In the present embodiment, tap type winding centered by second subprime winding 144.
Second subprime winding 144 is electrically connected on a level Detection capacitance device 15.Described level Detection capacitance device 15 is in order to detect the voltage of second subprime winding 144 outputs.By the turn ratio of adjusting second subprime winding 144 and the first secondary winding 142, just can learn via detecting the voltage of level Detection capacitance device 15 voltage of the first secondary winding 142 outputs.In addition, controller 11 is also electrically connected on second subprime winding 144, the frequency that controller 11 switches to control switching device 100 by the voltage that detects 144 outputs of second subprime winding, so as to the voltage of modulation the first secondary winding 142 and 144 outputs of second subprime winding.
Rectification unit 16 comprises two the first rectifiers 160 and second rectifier 162, the first rectifier 160 is electrically connected on the first secondary winding 142 and light-emitting diode serial 3, in order to the electric energy that is alternating current form of the first secondary winding 142 outputs is converted to the direct current of tool dither composition.The second rectifier 162 is electrically connected on second subprime winding 144 and determines current control unit 20.In the present embodiment, the first rectifier 160 is the bridge rectifiers that consist of four diodes 161, and the second rectifier 162 is the full-wave rectifiers that consist of two diodes 163.
Power balance unit 18 comprises a balancing transformer 180 and two balanced capacitors 182, and balancing transformer 180 comprises two balance coils 184, and described balance coil 184 has the identical number of turn.Balance coil 184 is electrically connected on respectively the first secondary winding 142 and the first rectifier 160, the electric current in order to equiulbrium flow through balance coil 184, and the electric current that makes to be passed to rectification unit 16 is consistent.Balanced capacitor 182 is electrically connected on the first secondary winding 142 and the first rectifier 160, and described balanced capacitor 182 has the function of burning voltage.Respectively this balanced capacitor 182, respectively this first secondary winding 142 and respectively this balance coil 184 be and be connected in series.
Determine current control unit 20 and comprise a driving element 200 and a power conversion circuit 202, driving element 200 is in order to detect conducting in the electric current of light-emitting diode serial 3, and by described current feedback to power conversion circuit 202.When conducting excessive or when too small, power conversion circuit 202 is corresponding to be reduced or improve by the voltage of determining 4 outputs of Voltage-output module, makes conducting maintain certain value in the electric current of light-emitting diode serial 3 in the electric current of light-emitting diode serial 3.In the present embodiment, power conversion circuit 202 is usingd booster circuit as illustrative example, and during actual enforcement, power conversion circuit 202 can be also reduction voltage circuit.
In addition, light emitting diode drive device 1 also comprises a plurality of capacitor for voltage protections 22, and each capacitor for voltage protection 22 is connected in parallel in a light-emitting diode serial 3.Each light-emitting diode serial 3 has specific operating voltage, and described operating voltage equals the summation of forward conducting voltage of the light-emitting diode 30 of each light-emitting diode serial 3.Because the operating voltage of each light-emitting diode serial 3 is not quite similar, therefore for effectively driving all light-emitting diode serials 3, the voltage of the first secondary winding 142 outputs of converting unit 14 must be same as the operating voltage in these light-emitting diode serials 3 with the light-emitting diode serial 3 of maximum working voltage.And the light-emitting diode serial 3 that wherein operating voltage is less than aforementioned maximum working voltage just must utilize capacitor for voltage protection 22 to store by the first secondary winding 142 outputs but higher than the difference voltage of operating voltage, damage so as to avoiding light-emitting diode 30 to bear excessive voltage.
In addition, be noted that, when the quantity of light-emitting diode serial 3 increases, must increase the quantity of the first secondary side winding 142, balance coil 184 and the first rectifier 160, and first secondary side winding 142 of every increase, just can increase by two and be the light-emitting diode serial 3 being connected in parallel; Certainly, increase by a secondary side winding 142 and also can only increase a light-emitting diode serial 3.And first secondary side winding 142 of every increase, just must correspondingly increase a balance coil 184 and first rectifier 160.
When practical operation, after the direct current signal that light emitting diode drive device 1 receiver voltage source VIN provides, switch unit 10 switches to pulsating direct current signal by direct current power, the voltage that resonant element 12 is exported with modulation according to the switching frequency of pulsating direct current signal, and described voltage is passed to converting unit 14.Converting unit 14, in order to power source conversion function to be provided, makes the first secondary winding 142 outputs of converting unit 14 can supply to light the voltage of light-emitting diode serial 3, and second subprime winding 144 outputs of converting unit 14 are as the voltage of calibration requirements simultaneously.
Balance coil 182 use of power balance unit 18 are to be passed to the electric current of the first rectifier 160 of converting unit 16 consistent, balanced capacitor 182 is in order to burning voltage, thus, just can allow the electric current that is passed to light-emitting diode serial 3 be certain value, so as to making light-emitting diode serial 3 reach consistent brightness.The driving element 200 of determining current control unit 20 detects conducting and whether reaches a predetermined value in the electric current of light-emitting diode serial 3, for example conducting is 200 micromicroamperes in each light-emitting diode serial 3,, for making the luminosity of three light-emitting diode serials 3 of present embodiment consistent, determine the electric current that Voltage-output module 4 must provide 600 micromicroamperes.When determining current control unit 20, detect the voltage of determine 4 outputs of Voltage-output module and can make conducting to the electric current of light-emitting diode serial 3 reach aforementioned predetermined value, make to determine the magnitude of voltage that Voltage-output module 4 exports and maintain definite value.If determining current control unit 20 detects and determine the electric current that Voltage-output module 4 exports and does not reach aforementioned predetermined value, driving element 200 is sent a signal to power conversion circuit 202, and make the switching frequency of controller 11 modulation switching devices 100, so as to improving conducting in the voltage of light-emitting diode serial 3.
Comprehensive the above, light-emitting diode assembly 1 of the present utility model utilizes to be determined Voltage-output module 4 and determines current control unit 20 to make conducting maintain definite value in voltage and the electric current of light-emitting diode serial 3, thus, just can allow light-emitting diode serial 3 reach the luminous of consistent brightness.Secondly, light-emitting diode assembly 4 of the present utility model determine Voltage-output module 4 and current control unit 20 and can be connected in a plurality of light-emitting diode serials 3 simultaneously, thus, can effectively reduce the circuit framework of light emitting diode drive device 1, and then dwindle the volume of light emitting diode drive device 1.
Yet the foregoing is only preferred embodiment of the present utility model; can not limit the scope that the utility model is implemented; be all equalization variations of doing according to the utility model claims and modification etc., all should still belong to the category of patent covering scope intention of the present utility model protection.

Claims (10)

1. a light emitting diode drive device, is characterized in that, is electrically connected on a voltage source and a plurality of light-emitting diode serial, and this light emitting diode drive device comprises:
Certain voltage output module, is electrically connected on this voltage source, and this is determined Voltage-output module and comprises:
One switch unit;
One resonant element, is electrically connected on this switch unit;
One converting unit, comprises an armature winding, two the first secondary winding and a second subprime winding, and this armature winding is electrically connected on this resonant element;
One power balance unit, comprises a balancing transformer, and this balancing transformer comprises two balance coils, and those balance coils are electrically connected on those the first secondary winding;
One rectification unit, is electrically connected on this power balance unit and those light-emitting diode serials; And
Certain current control unit, is electrically connected on this second subprime winding and those light-emitting diode serials.
2. light emitting diode drive device according to claim 1, it is characterized in that, this is determined current control unit and comprises a driving element and a power conversion circuit, this driving element is electrically connected on those light-emitting diode serials, and this power conversion circuit is electrically connected on this driving element and this second subprime winding.
3. light emitting diode drive device according to claim 2, it is characterized in that, this power balance unit also comprises two balanced capacitors, those balanced capacitors are electrically connected on those first secondary winding and this rectification unit, respectively this balanced capacitor, respectively this first secondary winding and respectively this balance coil be and be connected in series.
4. light emitting diode drive device according to claim 3, is characterized in that, also comprises a controller, is electrically connected on this second subprime winding and this switch unit, and this controller is controlled the switching frequency of this switch unit.
5. light emitting diode drive device according to claim 4, is characterized in that, also comprises a plurality of capacitor for voltage protections, and respectively this capacitor for voltage protection is parallel to respectively this light-emitting diode serial.
6. light emitting diode drive device according to claim 5, it is characterized in that, this rectification unit comprises two the first rectifiers and one second rectifier, those first rectifiers are electrically connected on respectively those first secondary winding and those light-emitting diode serials, and this second rectifier is electrically connected on this second subprime winding.
7. light emitting diode drive device according to claim 6, is characterized in that, also comprises a level Detection capacitance device, is electrically connected on this second rectifier.
8. light emitting diode drive device according to claim 7, is characterized in that, those balance coils have the identical number of turn.
9. light emitting diode drive device according to claim 8, it is characterized in that, this resonant element comprises a resonant capacitor, a resonant inductor and a magnetizing inductance device, this resonant capacitor, this resonant inductor and this magnetizing inductance device are and are electrically connected in series, this magnetizing inductance device parallel connection is electrically connected on this armature winding, and this magnetizing inductance device is electrically connected on this resonant inductor.
10. light emitting diode drive device according to claim 9, is characterized in that, this switch unit comprises two switching devices, is electrically connected on this controller, the switching frequency of these those switching devices of controller modulation.
CN201320563168.4U 2013-09-11 2013-09-11 LED (Light Emitting Diode) driving device Expired - Fee Related CN203492228U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320563168.4U CN203492228U (en) 2013-09-11 2013-09-11 LED (Light Emitting Diode) driving device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320563168.4U CN203492228U (en) 2013-09-11 2013-09-11 LED (Light Emitting Diode) driving device

Publications (1)

Publication Number Publication Date
CN203492228U true CN203492228U (en) 2014-03-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201320563168.4U Expired - Fee Related CN203492228U (en) 2013-09-11 2013-09-11 LED (Light Emitting Diode) driving device

Country Status (1)

Country Link
CN (1) CN203492228U (en)

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GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140319

Termination date: 20170911

CF01 Termination of patent right due to non-payment of annual fee