CN104540287B - LED dimming driving circuits - Google Patents
LED dimming driving circuits Download PDFInfo
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- CN104540287B CN104540287B CN201410829583.9A CN201410829583A CN104540287B CN 104540287 B CN104540287 B CN 104540287B CN 201410829583 A CN201410829583 A CN 201410829583A CN 104540287 B CN104540287 B CN 104540287B
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Abstract
The present invention relates to a kind of LED dimming driving circuits, including rectification unit and N level LED DC drive circuits.Wherein, i-stage LED DC drive circuits are by the i-th voltage sampling unit, the i-th switch element and the i-th LED light source module composition.N is natural number, i=1,2,3 ..., N；The input of the first end of i-th voltage sampling unit and the i-th LED light source module is commonly connected to the first output end of rectification unit when i is 1, and the output end of the i-th 1 LED light source modules is commonly connected to when i is not 1.The second end ground connection of i-th voltage sampling unit, the partial pressure end of the i-th voltage sampling unit is connected to the second input of the i-th switch element.The first input end of i-th switch element is connected to the output end of the i-th LED light source module, the output end of the i-th switch element and the second output head grounding of rectification unit.Compatible traditional controllable silicon dimmer of the invention, without other independent wiring, realizes the regulation of brightness, colour temperature or color.
Description
The present invention be original applying number be 201210424253.2, original application day be October 30, former denomination of invention in 2012
The divisional application of the dimming driving circuit of LED module is directly driven for alternating current.
Technical field
The present invention relates to lighting field, more particularly to a kind of LED dimming driving circuits of compatible silicon controlled light modulator.
Background technology
LED is expected to turn into a new generation's illumination as a kind of New Solid light source with the advantages that its energy-saving and environmental protection, long lifespan
Light source.It is well known that LED is direct voltage drive, and our production and living electricity consumption is exchange cycle electricity.Therefore,
Think normally to light LED, it is necessary to which a power supply changeover device, realizes rectification and the function being depressured.The introducing of power supply changeover device, brings very
More negative effects.First, life-span of the life-span of power supply changeover device well below LED itself so that the service life of light-emitting device
Shorten；Second, power supply changeover device can reduce the efficiency of light-emitting device；Third, in low-power applications, power supply changeover device can cause
The decline of power factor and the increase of current total harmonic.In order to give full play to LED intrinsic advantage, people have invented to use and handed over
Flow the LED light emission device of electric power direct drive.
In the technical scheme of known LED drivings, when compatible traditional controllable silicon dimmer, only it is conceived to duplication
Traditional brightness control function, and the characteristics of have ignored LED colour temperature, Color tunable.In addition, current alternating current direct drive
LED technology scheme mostly be using plurality of LEDs component according to the circuit topological structure of reverse parallel connection or bridge rectifier connection and
Into to meet the driving requirement of alternating electromotive force.But alternating current is fluctuated according to certain frequency cycle, due to LED certainly
The presence of body cut-in voltage, when instantaneous voltage exceedes cut-in voltage, LED can just be turned on and lighted；Conversely, LED is off not
Luminous.This circuit make it that LED luminous efficiency is very low, and in AC voltage fluctuations, it may appear that light-emitting flash phenomenon.
Chinese patent CN 102202441A disclose the current constant control that a kind of LED illumination lamp is directly powered with AC power
Device topological circuit, it includes EMI circuits, rectification circuit, circuit of power factor correction and constant-current drive circuit.Its working method
For：Circuit of power factor correction changes leading for power factor control circuit 31 and 32 according to the big minizone of input ac voltage
Logical state so that the quantity of lighting of LED illumination lamp changes, so as to improve power factor.In real work, power factor
As long as 31,32 equivalent switch of control circuit will switch immediately when reaching 1/3,2/3 crest voltage, with this improve power because
Number.Referring to Fig. 1, in power factor control circuit 31,32 K1, K2 conducting state only by corresponding biasing resistor R6, R7 or
The influence of voltage on the circuit of R8, R9 composition.
And the i-th switch element receives the i-th cut-in voltage through the i-th LED light source module and adopted through the i-th voltage in the present invention
The partial pressure end of sample unit receives the i-th shut-off voltage.There is similar and different colour temperature and color per one-level LED light source module, if
The parameter for putting voltage sampling unit in every one-level LED drive circuit carrys out the turn-off time of controlling switch unit, so as to adjust LED's
Colour temperature and color.Therefore, the present invention in switch element on off operating mode by cut-in voltage and shut-off voltage joint effect.Enter
One step, the present invention uses switch not using the conventional switch switching topological circuit as disclosed in above-mentioned documents
Unit receives cut-in voltage and shut-off voltage from corresponding LED light source module output end and voltage sampling unit partial pressure end.Switch
Unit receives the cut-in voltage for reaching threshold value and turned on, and maintains conducting state to reach its threshold value until the shut-off voltage of reception
Turn it off.Each switch element can maintain specific ON time as required, be adjusted so as to meet LED colour temperature and color
The demand of section.
The company of constant-current circuit input in the connected mode and documents of two inputs of switch element of the present invention
There is significant difference in the mode of connecing, and there is also difference for the particular circuit configurations of switch element and constant current unit in documents：
In constant-current source 42 metal-oxide-semiconductor V2 grid connection R3 and R4 partial pressure end, the present invention in switch element M2 grid connection R5.These
Difference in structure result in the present invention and the working method of documents has foregoing difference.
In summary, the technical problem that aforementioned comparison's file solves is how to improve exchange driving LED power factor, this
The technical problem that invention solves is that LED colour temperature and color how are adjusted in the case where exchange drives, while compatible silicon controlled regulation.Two
The technical problem technological means that are different, and using that person solves, the working method of drive circuit are also different.Therefore, it is foregoing right
There is no technical inspiration to the present invention than file.
The content of the invention
It is especially a kind of compatible it is an object of the invention to provide a kind of circuit of alternating current direct drive LED light source module
The dimming driving circuit of controllable silicon dimmer.
According to an aspect of the invention, there is provided a kind of alternating current dimming driving circuit for LED, including：Rectification
Unit and the first order LED direct currents being made up of first voltage sampling unit, first switch unit and the first LED light source module drive
Dynamic circuit；Rectification unit receives alternating current, carries out rectification to the alternating current of reception and exports DC voltage；Rectification unit will export
DC voltage through the first output end be output to the first LED light source module input and first voltage sampling unit first
End, the output end of the first LED light source module are connected to first switch unit first input end, the partial pressure of first voltage sampling unit
End is connected to the second input of first switch unit；The output at the second end, first switch unit of first voltage sampling unit
End and the second output head grounding of rectification unit；First switch unit receives the first cut-in voltage through the first LED light source module
And the partial pressure end through first voltage sampling unit receives the first shut-off voltage；When the rise of the first cut-in voltage reaches first switch
During the first turn on voltage threshold of unit, first switch unit is connected and the first LED light source module continuous illumination；When reception
When first shut-off voltage is increased to the first shut-off voltage threshold of first switch unit, first switch unit shut-off so that first
LED light source module stops luminous.
Wherein, the first shut-off voltage threshold is adjusted by setting the inner parameter of first switch unit.
Wherein, the alternating current dimming driving circuit for LED further comprises：
Protection location is inputted, its input is connected to alternating current, and output end is connected to the input of rectification unit.
Wherein, the first LED light source module includes：
The LED luminescence units of multiple series connection；
Multiple LED luminescence units in parallel；Or
The LED luminescence units of multiple serial-parallel mirrors.
Wherein, first voltage sampling unit includes：
First resistor, its one end are connected to the first output end of the rectification unit；
Second resistance, its one end are connected to the other end of first resistor and as the partial pressures of each voltage sampling unit
End, the other end ground connection of second resistance.
Wherein, the turn-off time of first switch unit is adjusted by setting the resistance of the first and second resistance.
Wherein, first switch unit includes the 3rd to the 5th resistance, the first and second voltage-regulator diodes and first and
Two FETs, wherein
One end of 3rd resistor is connected to the partial pressure end；
The negative terminal of first voltage-regulator diode divides press bond, positive ending grounding with described；
The grid of first FET is connected to the other end of 3rd resistor, source ground；
The drain electrode of first FET, one end of the 4th resistance, one end of the 5th resistance, the negative terminal of the second voltage-regulator diode
Connection；
The other end of 5th resistance is connected with the grid of the second FET；The drain electrode of second FET, the 4th resistance
The other end, the first LED light source module negative terminal connection；
The source ground of the anode of second voltage-regulator diode and the second FET.
Further, the alternating current dimming driving circuit for LED includes：Controllable silicon dimmer, it is connected in series in exchange
Between electric live wire and the rectification unit.
Further, the alternating current dimming driving circuit for LED includes：Controllable silicon dimmer, it is connected in series in exchange
Between electric live wire and the input protection location.
According to another aspect of the present invention, there is provided a kind of alternating current dimming driving circuit for LED, its feature exist
In, including：Rectification unit and N level LED DC drive circuits, i-stage LED DC drive circuits are by the i-th voltage sampling unit, and
I switch elements and the i-th LED light source module composition, N are natural number more than 1, i=2,3 ..., N；
Rectification unit receives alternating current, carries out rectification to the alternating current of reception and exports DC voltage；
The input of the first end of i-th voltage sampling unit and the i-th LED light source module is commonly connected to when i is 1
First output end of rectification unit, the output end of the i-th -1LED light source module groups is commonly connected to when i is not 1；I-th voltage sample
The second end ground connection of unit, the partial pressure end of the i-th voltage sampling unit is connected to the second input of the i-th switch element；
The first input end of i-th switch element is connected to the output end of the i-th LED light source module, the i-th switch element it is defeated
Go out the second output head grounding of end and rectification unit；
I-th switch element receives the i-th cut-in voltage and dividing through the i-th voltage sampling unit through the i-th LED light source module
Pressure side receives the i-th shut-off voltage；
When the rise of the i-th cut-in voltage reaches the i-th turn on voltage threshold of the i-th switch element, the i-th switch element is connected simultaneously
And the 1st to the i-th LED light source module continuous illumination, while make i+1 to the input/output terminal of N level LED DC drive circuits
Short circuit；When the i-th shut-off voltage of reception is increased to the i-th shut-off voltage threshold of the i-th switch element, the shut-off of the i-th switch element,
And the i+1 cut-in voltage of i+1 switch element is caused to be increased to i+1 turn on voltage threshold when i is less than N, so as to the 1st
Lighted to i+1 LED light source module, cause the 1st to stop lighting to N LED light sources module when i is equal to N.
Wherein, there is similar and different colour temperature and color per one-level LED light source module；
Inner parameter per the voltage sampling unit in one-level LED DC drive circuits is set, to cause i LED light source
Module illuminated in combination, realize default colour temperature or color adjustment.
Wherein, the i-th LED light source module includes：
The LED luminescence units of multiple series connection；
Multiple LED luminescence units in parallel；Or
The LED luminescence units of multiple serial-parallel mirrors.
Further, the alternating current dimming driving circuit for LED includes：Protection location is inputted, its input is connected to
Alternating current, output end are connected to the input of rectification unit.
Wherein, each voltage sampling unit includes：
First resistor, its one end are connected to the first output end of the rectification unit；
Second resistance, its one end are connected to the other end of first resistor and as the partial pressures of each voltage sampling unit
End, the other end ground connection of second resistance.
Wherein, the switch in every one-level LED DC drive circuits is adjusted by setting the resistance of the first and second resistance
The turn-off time of unit.
Wherein, each switch element includes the 3rd to the 5th resistance, the first and second voltage-regulator diodes and the first He
Second FET, wherein
One end of 3rd resistor is connected to the partial pressure end；
The negative terminal of first voltage-regulator diode divides press bond, positive ending grounding with described；
The grid of first FET is connected to the other end of 3rd resistor, source ground；
The drain electrode of first FET, one end of the 4th resistance, one end of the 5th resistance, the negative terminal of the second voltage-regulator diode
Connection；
The other end of 5th resistance is connected with the grid of the second FET；The drain electrode of second FET, the 4th resistance
The other end, the first LED light source module negative terminal connection；
The source ground of the anode of second voltage-regulator diode and the second FET.
Further, the alternating current dimming driving circuit for LED includes：Controllable silicon dimmer, it is connected in series in exchange
Between electric live wire and the rectification unit.
Further, the alternating current dimming driving circuit for LED includes：Controllable silicon dimmer, it is connected in series in exchange
Between electric live wire and the input protection location.
In the present invention, when the instantaneous value of alternating voltage reaches the cut-in voltage of each LED light source module, switch element is led
Logical, LED light source module starts to light；When the instantaneous value of alternating voltage exceedes default shut-off voltage, switch element shut-off, phase
The next stage LED light source module answered also begins to light.When adjusting the knob of controllable silicon dimmer, the angle of flow of controllable silicon occurs
Change so that the LED light source module of each different-colour or different colours lights alone or in combination, realizes the colour temperature of whole circuit
Or Color tunable；When alternating electromotive force fluctuates, within normal operating voltage range, i.e. opening in LED light source module
When opening between voltage and default shut-off voltage, the time point of the simply turn-on and turn-off of switch element to change, LED light
The luminous of source module does not change.Therefore, fluctuated in alternating electromotive force, the device is not in light-emitting flash phenomenon.
The present invention outstanding advantages be：Using the dimming driving circuit of alternating current direct drive LED module, compatible tradition can
Silicon light modulator is controlled, without other independent wiring, realizes the regulation of brightness, colour temperature or color；Circuit is simple, small volume, in light weight,
Cost is low.Protection location is inputted, the reliability and security of device is improved, enhances the ability of anti-electromagnetic disturbance, reduce
To the electromagnetic interference of power network.Sampling resistor network, the on or off of controlling switch unit, pass through a preset appropriate shut-off
Voltage, realize that alternating electromotive force direct drive LED matrix will not flash when AC voltage fluctuations.Also, in alternating electromotive force
Instantaneous voltage it is too high when, switch element shut-off, LED light source module do not light, improves the utilization ratio of power supply, reduce electricity
Power is lost.Meanwhile the situation for also avoiding LED light source module from being burnt because electric current is excessive, extend the service life of device.
Brief description of the drawings
Fig. 1 shows the principle schematic of the alternating current dimming driving circuit for LED of one embodiment of the present of invention.
Fig. 2 shows the exemplary circuit figure of Fig. 1 alternating current dimming driving circuit for LED.
Fig. 3 shows that the alternating current dimming driving circuit principle in accordance with another embodiment of the present invention for LED is illustrated
Figure.
Fig. 4 shows the exemplary circuit figure of the alternating current dimming driving circuit for LED of embodiment illustrated in fig. 3.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, referring to the drawings and preferred reality is enumerated
Example is applied, the present invention is described in more detail.However, it is necessary to illustrate, many details listed in specification are only to be
Reader is set to have a thorough explanation to the one or more aspects of the present invention, even without these specific details can also
Realize the aspects of the invention.
Fig. 1 shows the principle schematic of the alternating current dimming driving circuit for LED of one embodiment of the present of invention.
As shown in figure 1, alternating current dimming driving circuit includes rectification unit 12, first voltage sampling unit 14, first switch unit 16
And the first LED light source module 18.Rectification unit 12 includes four diodes, and 4 diodes form bridge rectifier.It can replace
Ground is changed, rectification unit 12 can also be the rectification unit of other circuit structures.Rectification unit 12 receives alternating current and to alternating current
Carry out rectification.DC voltage after rectification is that anode is output to the first LED light source module through the first output end by rectification unit 12
18 input and the first end of first voltage sampling unit 14.The output end of first LED light source module 18 is connected to first
It is second defeated to be connected to first switch unit 16 for the first input end of switch element 16, the partial pressure end of first voltage sampling unit 14
Enter end.It is second end of first voltage sampling unit 14, the second of the output end of first switch unit 16 and rectification unit 12 defeated
Go out end i.e. negativing ending grounding.First switch unit 16 receives the first cut-in voltage and through the first electricity through the first LED light source module 18
The partial pressure end of sampling unit 14 is pressed to receive the first shut-off voltage.When the rise of the first cut-in voltage reaches the of first switch unit 16
During one turn on voltage threshold, first switch unit 16 is connected and the continuous illumination of the first LED light source module 18.When received
When one shut-off voltage is increased to the first shut-off voltage threshold of first switch unit 16, first switch unit 16 turns off so that the
One LED light source module 18 stops luminous.In the present invention, adjusted by setting the inner parameter of first voltage sampling unit 14
The output voltage at partial pressure end, the first of adjustment first switch unit 16 turns off voltage threshold so as to adjust the turn-off time.
In the present invention, LED light source module is made up of the LED luminescence units of multiple series connection, can also be by multiple LED in parallel
Luminescence unit forms, or is made up of the LED luminescence units of multi-series and parallel series-parallel connection.LED light source module can be identical or different color
LED light source module that is warm, can also being identical or different color.
Alternatively, as shown in figure 1, in order to be protected to whole electric current, alternating current dimming driving circuit also includes input
Protection location 10.The input of input protection location 10 is connected to alternating current, and output end is connected to the input of rectification unit 12.
It will be appreciated by those skilled in the art that input protection location it is not necessary to.Protection location 10 is inputted to provide whole circuit
Basic defencive function, it is made up of piezo-resistance, thermistor, fuse, may also include common mode during applied to particular surroundings grips
Stream circle and gas-discharge tube.
Further, alternating current dimming driving circuit also includes the first and second exchange electric connecting terminals.Alternating current is through first
Input protection location 10 is input to the second AC terminal.
Fig. 2 shows the exemplary circuit figure of Fig. 1 alternating current dimming driving circuit for LED.As shown in Fig. 2 input
Protection location 10 is made up of fuse and piezo-resistance VR.As it was previously stated, input protection location 10 can not also be included.First electricity
Pressure sampling unit 14 is made up of the first and second resistance R1 and R2.First switch unit is by two FET MOSFET, 3 electricity
Resistance and two voltage-regulator diodes are formed.First exchange electric connecting terminals are connected with fuse FUSE one end, as alternating electromotive force
Zero line L, one of the second exchange electric connecting terminals and the rectifier bridge in piezo-resistance VR one end and rectification unit exchange it is defeated
Enter end connection, as alternating current zero line side N.The fuse other end and piezo-resistance the VR other end and rectification unit 12
Another exchange end connection of rectifier bridge.The output plus terminal of rectifier bridge connects with first resistor R1 one end, while is connected to
The anode of one LED light source module, the output negativing ending grounding of rectifier bridge.The first resistor R1 other end and the one of second resistance R2
End, the first voltage-regulator diode DZ1 negative terminal, 3rd resistor R3 one end connection；The 3rd resistor R3 other end and first effect
Should pipe M1 grid connection；First FET M1 drain electrode, the 4th resistance R4 one end, the 5th resistance R5 one end, second
Voltage-regulator diode DZ2 negative terminal connection；The 5th resistance R5 other end is connected with the second FET M2 grid；Second effect
Should pipe M2 drain electrode, the negative terminal connection of the 4th resistance R4 other end, the first LED light source module.The second resistance R2 other end,
First voltage-regulator diode DZ1 anode, the second voltage-regulator diode DZ2 anode, the first FET M1 source electrode, second effect
Should pipe M2 source electrode be connected to ground.
In Fig. 2 embodiment, it is connected by plug with AC network.Alternating current passes through input protection location, and by rectification
Unit is supplied to first voltage sampling unit, first switch unit and the first LED light source module after being rectified into direct current.Each
In ac cycle, rectifier bridge output voltage is started from scratch rising, when voltage is increased to the first cut-in voltage of first switch unit
When, the first FET M1 shut-offs, the second FET M2 is turned on, and the first LED light source module starts to light.With input voltage
Rise, the electric current increase that the first LED module passes through, is less than default shut-off in the voltage that the partial pressure end of the first sampling unit exports
During voltage threshold, so that the first FET M1 is turned on, M1 is protected the undertension of the partial pressure end output of first voltage sampling unit
Shut-off is held, the second FET M2 is held on, the first LED light source module continuous illumination.When voltage continues to raise, cause first
When the voltage of the partial pressure end output of voltage sampling unit exceedes the default first shut-off voltage threshold, the first FET M1 starts
Conducting, the second FET M2 shut-offs, the first LED light source module do not light, and protect the first LED light source module from high current
Impact.As it was previously stated, the resistance by setting first resistor R1 and second resistance R2 in first voltage sampling unit, can adjust
First FET M1 ON time, so as to adjust the first shut-off voltage threshold.Alternatively, switching tube in above embodiment
Realized with FET M1, M2, those skilled in the art can use bipolar crystal type transistor BJT or other tools
The switching device for having equivalent efficacy replaces FET to realize the present invention.It will be appreciated by those skilled in the art that when FET is led
When logical (i.e. first switch unit is connected), the pressure drop very little between drain electrode and source electrode, i.e., in short-circuit condition.
Fig. 3 shows that the alternating current dimming driving circuit principle in accordance with another embodiment of the present invention for LED is illustrated
Figure.Identical with embodiment as shown in Figure 1, alternating current dimming driving circuit includes rectification unit 12, first voltage sampling unit
14, the LED light source module 18 of first switch unit 16 and first.First voltage sampling unit 14, first switch unit 16 and
First LED light source module 18 forms first order LED direct current dimming driving circuits.Further, the alternating current light modulation of the present embodiment is driven
Dynamic circuit also includes second voltage sampling unit 20, second switch unit 22, the second level of the second LED light source module 24 composition
LED direct currents dimming driving circuit and tertiary voltage sampling unit 26, the 3rd switch element 28 and the 3rd LED light source module 30 form
Third level LED direct current dimming driving circuits.In the present embodiment, second voltage sampling unit 20, second switch unit 22, second
LED light source module 24 respectively with first voltage sampling unit 14, the phase of 16 and first LED light source module of first switch unit 18
Together, tertiary voltage sampling unit 26, the 3rd switch element 28 and the 3rd LED light source module 30 respectively with first voltage sampling unit
14, the LED light source module 18 of first switch unit 16 and first is identical.
Fig. 4 shows the exemplary circuit figure of the alternating current dimming driving circuit for LED of embodiment illustrated in fig. 3.Fig. 4
In, the input of the first end of second voltage sampling unit 20 and the second LED light source module 24 is commonly connected to the first LED light
The output end of source module 18.The second end ground connection of second voltage sampling unit 20, the partial pressure end of second voltage sampling unit 20 connect
It is connected to the second input of second switch unit 22.The first input end of second switch unit 22 is connected to the second LED light source mould
The output end of group 24, the output head grounding of second switch unit 22.It is similar with first order LED DC drive circuits, second switch
Unit 22 receives through the second LED light source module 24 the second cut-in voltage of reception and the partial pressure end through second voltage sampling unit 20
Second shut-off voltage.When first cut-in voltage reaches the first turn on voltage threshold, first switch unit is connected, then the first LED light
Source module lights, while second and the input and output end of third level LED DC drive circuits after short circuit, therefore second
LED light source module will not light.First opens the light after unit short circuit, and the second cut-in voltage gradually rises.When the second cut-in voltage liter
When up to arriving the second turn on voltage threshold of second switch unit 22, second switch unit 22 is connected and the second LED light source mould
The LED light source module continuous illumination together of group 24 and first.When the second shut-off voltage received is increased to second switch unit 22
The second shut-off voltage threshold when, second switch unit 22 turns off so that the second LED light source module 24 stops luminous.
Equally, the identical company according to second level LED direct currents dimming driving circuit with first order LED direct current dimming driving circuits
Mode is connect, third level LED direct current dimming driving circuits are connected on the LED direct current dimming driving circuits of the second level.Specifically,
The first end of three voltage sampling units 26 and the input of the 3rd LED light source module 28 are commonly connected to the second LED light source mould
The output end of group 24.The second end ground connection of tertiary voltage sampling unit 26, the partial pressure end of tertiary voltage sampling unit 26 is connected to
Second input of the 3rd switch element 30.The first input end of 3rd switch element 30 is connected to the 3rd LED light source module 28
Output end, the output head grounding of the 3rd switch element 30.It is similar with first order LED DC drive circuits, the 3rd switch element
30 receive the 3rd through the 3rd LED light source module 28 the 3rd cut-in voltage of reception and the partial pressure end through tertiary voltage sampling unit 26
Turn off voltage.When one of first and second switch elements are switched on, third level LED DC drive circuits are short-circuited, therefore the
Three LED light source modules do not light.After the first and second switch elements are turned off, the 3rd cut-in voltage gradually rises.When the 3rd
Cut-in voltage rise is when reaching three turn on voltage threshold of the 3rd switch element 30, and the 3rd switch element 30 is connected and first
To the continuous illumination of three LED light source module 28.Closed when the 3rd shut-off voltage received is increased to the 3rd of the 3rd switch element 30
During disconnected voltage threshold, the 3rd switch element 30 turns off so that all LED light source modules 28 stop lighting, and reach protection LED module
The purpose of unit.
In the LED DC drive circuits of the second level, second voltage sampling unit is made up of two resistance, second switch unit by
Two MOSFET, 3 resistance and two voltage-regulator diodes are formed.Equally, in third level LED DC drive circuits, tertiary voltage
Sampling unit is made up of two resistance, and the 3rd switch element is made up of two MOSFET, 3 resistance and two voltage-regulator diodes.
Second and third level LED DC drive circuits concrete structure in element annexation such as first order LED DC drive circuits
In element annexation, will not be repeated here.
In the present embodiment, alternating current dimming driving circuit can adjust the brightness of the first to the 3rd LED light source module, colour temperature
Or color.Specifically, by set respectively first to tertiary voltage sampling unit inner parameter, such as each voltage is set
The resistance of two divider resistances in sampling unit so that the turn-off time per one-level switch element is different, each so as to control
The ON time of the LED light source module of kind colour temperature or color, to adjust the colour temperature of whole lighting device or color change.
Alternatively, alternating current dimming driving circuit can also include input protection location 10, to be protected to whole circuit
Shield.
In the above embodiments, the alternating current dimming driving circuit for LED includes one-level LED direct current dimming driving circuits
Or three-level LED direct current dimming driving circuits.Using the principle of above-described embodiment, it will be appreciated by those skilled in the art that the present invention can
With the situation applied to two level LED or more than 3 grades of LED direct current dimming driving circuits.
(N is the natural number more than 1), first order LED in except the situation including N level LED direct current dimming driving circuits
The annexation of direct current dimming driving circuit as it was previously stated, i-stage with the i-th -1 grade of connection such as the foregoing second level and first
The annexation of level LED direct current dimming driving circuits.Wherein, i is integer, and i=2,3,4 ..., N.I-stage LED DC drivens
Circuit includes the i-th voltage sampling unit, the i-th LED light source module and the i-th switch element.The tool of i-stage LED DC drive circuits
Body structure is identical with the structure of the first LED direct current dimming driving circuits in foregoing embodiment.I-th switch element is through I
LED light source module receives the i-th cut-in voltage and the partial pressure end through the i-th voltage sampling unit receives the i-th shut-off voltage.When i-th
When cut-in voltage rise reaches the i-th turn on voltage threshold of the i-th switch element, the i-th switch element is connected and preceding i LED light
Source module while continuous illumination.Now, after being connected due to the i-th switch element, next stage is i+1 level LED DC drivens by it
The input and output side short circuit of circuit, therefore i+1 LED light source module does not light.When the i-th shut-off voltage received is increased to
During the i-th shut-off voltage threshold of the i-th switch element, the shut-off of the i-th switch element.If i<N, after the shut-off of the i-th switch element, then the
The i+1 cut-in voltage of i+1 switch element in i+1 level LED DC drive circuits will gradually rise, and reach i+1 unlatching
During voltage threshold, i+1 switch element is connected, then preceding i+1 unit starts to light together.If i=N, the i-th switch element closes
Have no progeny, then whole LED light source modules stop luminous.
Similarly, by setting the inner parameter of the i-th voltage sampling unit respectively, such as each voltage sample list is set
The resistance of two divider resistances in member so that the turn-off time per one-level switch element is different, so as to control each colour temperature
Or the ON time of the LED light source module of color, to adjust the colour temperature or color of the i-th LED light source module in whole lighting device
Change.
As can be seen that in the above embodiment of the present invention, voltage sampling unit can monitoring input voltage, while also have pair
The defencive function of LED light source module.When big fluctuation occurs in alternating voltage, the switch element in every one-level can break in time
Open, protect the LED light source module in this grade not damaged because electric current is excessive.
In addition, the alternating current dimming driving circuit for LED of the present invention (can also not show including controllable silicon dimmer
Go out).In this case, the input for inputting protection location is connected to alternating current through controllable silicon dimmer.Controllable silicon dimmer will
The alternating voltage cut of input, therefore the voltage waveform for being input to rectification unit is not complete sinusoidal waveform.Due to every one-level
Voltage sampling unit in LED DC drive circuits sets the shut-off electrical voltage point of every one-level switch element so that different-colour
Or the light source module of color lights alone or in combination, so as to realize the regulation of the colour temperature of LED light source module or color.The present invention
In, controllable silicon dimmer series connection directly can be accessed into whole circuit loop, it is not necessary to which individually laying control loop can is real
The regulation of existing brightness, colour temperature or color.
In the present invention, the dimming driving circuit of LED module, compatible traditional controllable silicon light modulation are directly driven using alternating current
Device, without other independent wiring, realize the regulation of brightness, colour temperature or color.The circuit of the present invention is simple, small volume, in light weight,
Cost is low.The use of protection location is inputted, improves the reliability and security of device, enhances the ability of anti-electromagnetic disturbance,
Reduce the electromagnetic interference to power network.Pass through the voltage sample resistor network preset one of the on or off to controlling switch unit
Individual appropriate shut-off voltage, realize that alternating current directly drives LED light source module, and LED light when AC voltage fluctuations
Source module will not flash.Also, when the instantaneous voltage of alternating electromotive force is too high, switch element shut-off, LED light source module is not sent out
Light, the utilization ratio of power supply is improved, reduces power consumption.Meanwhile LED light source module is also avoided to be burnt because electric current is excessive
Situation, extend the service life of device.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (3)
1. a kind of LED dimming driving circuits, it includes rectification unit and N level LED DC drive circuits, it is characterised in that also wraps
Controllable silicon dimmer is included, it is connected in series between alternating current fire wire and the rectification unit；
I-stage LED DC drive circuits are made up of the i-th voltage sampling unit, the i-th switch element and the i-th LED light source module,
N is natural number, i=1,2,3 ..., N；
The input of the first end of i-th voltage sampling unit and the i-th LED light source module is commonly connected to rectification when i is 1
First output end of unit, the output end of the i-th -1LED light source module groups is commonly connected to when i is not 1；I-th voltage sampling unit
The second end ground connection, the partial pressure end of the i-th voltage sampling unit is connected to the second input of the i-th switch element；
The first input end of i-th switch element is connected to the output end of the i-th LED light source module, the output end of the i-th switch element
With the second output head grounding of rectification unit；
Each switch element includes the 3rd to the 5th resistance, the first and second voltage-regulator diodes and the first and second field-effects
Pipe, wherein
One end of 3rd resistor is connected to the partial pressure end；
The negative terminal of first voltage-regulator diode divides press bond, positive ending grounding with described；
The grid of first FET is connected to the other end of 3rd resistor, source ground；
The drain electrode of first FET, one end of the 4th resistance, one end of the 5th resistance, the negative terminal of the second voltage-regulator diode connect
Connect；
The other end of 5th resistance is connected with the grid of the second FET；The drain electrode of second FET, the 4th resistance it is another
One end, the negative terminal connection of the first LED light source module；
The source ground of the anode of second voltage-regulator diode and the second FET；
Each described voltage sampling unit includes：
First resistor, its one end are connected to the first output end of the rectification unit；
Second resistance, its one end are connected to the other end of first resistor and as the partial pressure ends of each voltage sampling unit, and
The other end ground connection of two resistance；
The shut-off of the switch element in every one-level LED DC drive circuits is adjusted by setting the resistance of the first and second resistance
Time.
2. LED dimming driving circuits as claimed in claim 1, it is characterised in that the i-th switch element is through the i-th LED light source mould
Group receives the i-th cut-in voltage and the partial pressure end through the i-th voltage sampling unit receives the i-th shut-off voltage；
When the rise of the i-th cut-in voltage reaches the i-th turn on voltage threshold of the i-th switch element, the i-th switch element is connected and the
1 to the i-th LED light source module continuous illumination, while make i+1 to the input and output terminal shortcircuit of N level LED DC drive circuits；
When the i-th shut-off voltage of reception is increased to the i-th shut-off voltage threshold of the i-th switch element, the shut-off of the i-th switch element, and
The i+1 cut-in voltage of i+1 switch element is caused to be increased to i+1 turn on voltage threshold when i is less than N, so as to the 1st to the
I+1LED light source module groups light, and cause the 1st to stop lighting to N LED light sources module when i is equal to N,
Wherein, there is similar and different colour temperature and color per one-level LED light source module；
Inner parameter per the voltage sampling unit in one-level LED DC drive circuits is set so that per one-level switch element
Turn-off time difference controls corresponding LED light source module, so that i LED light source module light alone or in combination, realizes
Default colour temperature or color adjustment.
3. LED dimming driving circuits as claimed in claim 1 or 2, it is characterised in that further comprise input protection location and
Controllable silicon dimmer, wherein
The input of the input protection location is connected to alternating current, and output end is connected to the input of rectification unit；
The controllable silicon dimmer is connected in series between alternating current fire wire and the input protection location.
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| CN201410829583.9A CN104540287B (en) | 2012-10-30 | 2012-10-30 | LED dimming driving circuits |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210424253.2A CN102892238B (en) | 2012-10-30 | 2012-10-30 | Dimming drive circuit of AC (Alternating Current) direct drive LED module |
| CN201410829583.9A CN104540287B (en) | 2012-10-30 | 2012-10-30 | LED dimming driving circuits |
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| US11838999B2 (en) | 2018-07-16 | 2023-12-05 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED lighting system, apparatus, and dimming method |
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| CN105682307B (en) * | 2016-04-25 | 2018-03-16 | 电子科技大学中山学院 | drive method for continuously driving L ED |
| CN106211486B (en) * | 2016-08-31 | 2018-09-28 | 深圳市明微电子股份有限公司 | A kind of LED lamp and its light modulation toning circuit |
| US11191136B2 (en) | 2018-07-16 | 2021-11-30 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED lighting system, apparatus, and dimming method |
| CN112188684B (en) * | 2020-09-29 | 2022-10-28 | 深圳市晟碟半导体有限公司 | Constant-current LED driving circuit, device and driving method thereof |
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