CN103428939A - Light emitting diode module and driving circuit of light emitting diode - Google Patents
Light emitting diode module and driving circuit of light emitting diode Download PDFInfo
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- CN103428939A CN103428939A CN2012101594313A CN201210159431A CN103428939A CN 103428939 A CN103428939 A CN 103428939A CN 2012101594313 A CN2012101594313 A CN 2012101594313A CN 201210159431 A CN201210159431 A CN 201210159431A CN 103428939 A CN103428939 A CN 103428939A
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- emitting diode
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- control unit
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Abstract
The invention discloses a light emitting diode module and a driving circuit of the light emitting diode. The light emitting diode module comprises a first light emitting diode unit, a second light emitting diode unit, a first constant current control unit and a second constant current control unit. The first constant current control unit is connected between the cathode terminal of the first light emitting diode unit and the ground terminal of the first light emitting diode in a coupling mode, and a first current path between the first light emitting diode unit and the ground terminal is selectively conducted by the first constant current control unit according to the time varying direct voltage. The second constant current control unit is connected between the cathode terminal of the second light emitting diode and the ground terminal of the second light emitting diode in a coupling mode. When the first current path is conducted, the second constant current control unit selectively conducts a second current path from the first light emitting diode unit and the second light emitting diode unit which are connected in series to the ground terminal according to the time varying direct voltage, and cuts off the first current path through the second current path.
Description
Technical field
The present invention relates to light-emitting diode, particularly relate to light-emitting diode (LED) module and drive circuit thereof.
Background technology
Light-emitting diode (Light Emitting Diode, LED) there is splendid luminous efficiency, more traditional lighting device (as osram lamp, fluorescent lamp etc.) has more energy-conservation performance, and therefore the trend that progressively replaces traditional lighting arranged in recent years.
Please refer to Fig. 1, Fig. 1 is the circuit diagram of the constant-current driver of traditional light-emitting diode.Constant-current driver 1 is by alternating voltage AC with ac/dc (AC/DC) conversion, and the ac/dc conversion needs the elements such as bridge rectifier and electric capacity usually.AC/DC converter 11 will be higher alternating voltage AC be converted to lower direct voltage DC after, the feedback mechanism of determining current control unit 12 meeting formation formed with transformer (not shown), coil inductance 121, MOS (metal-oxide-semiconductor) memory (MOSFET) 122, diode 123, electric capacity 124, resistance 125, comparator 126 and voltage control unit (DC/DC conversion) 127 etc., reach by this to determine current drives light emitting diode 13(and comprise a plurality of light-emitting diodes 130).The advantage of constant-current driver 1 is to use the exchange type power technology, therefore can reach high efficiency.And the driving of light emitting diode 13 is constant current source, so brightness stability can not change with output voltage is unstable.
Traditional constant-current driver 1 can use the direct voltage conversion of determining electric current output of bridge rectifier, transformer, DC-DC (DC/DC), expensive wire-wound inductor and electrochemical capacitor etc., therefore major defect for be element many, take volume, have higher manufacture and element cost.Especially when using electrochemical capacitor, improper if light-emitting diode dispels the heat, can make the rising of lamp socket body temperature, electrochemical capacitor easily causes component ageing to lose efficacy because of heat, cause integrated circuit shortening in useful life.Simultaneously, because adopting the exchange type power technology, there is oscillating circuit Switching power switch repeatedly inside, and the problem such as electromagnetic radiation interference is easily arranged.
Summary of the invention
The invention provides a kind of light-emitting diode (LED) module and drive circuit thereof can be to determine the current drives light-emitting diode under the situation that receives alternating current.
The embodiment of the present invention provides a kind of light-emitting diode (LED) module, and it comprises that the first light emitting diode, the second light emitting diode, first determine current control unit and second and determine current control unit.The anode tap of the first light emitting diode straightens stream voltage when receiving.The cathode terminal of anode tap coupled in series first light emitting diode of the second light emitting diode.First determines between cathode terminal and earth terminal that current control unit is coupled to the first light emitting diode, and according to the time straighten the voltage swing of stream voltage, optionally conducting the first light emitting diode is to the first current path between earth terminal.Second determines between cathode terminal and earth terminal that current control unit is coupled to the second light emitting diode.When the first current path conducting, second determine current control unit according to the time straighten stream voltage voltage swing, optionally the first light emitting diode of conducting series connection and the second light emitting diode be to the second current path between earth terminal, and end according to this first current path.
The embodiment of the present invention provides a kind of LED driving circuit, in order to provide through bridge rectifier, cross the time straighten stream voltage and drive the first light emitting diode and second light emitting diode of series connection.LED driving circuit comprises that first determines current control unit, second and determine current control unit and bleeder circuit.First determines between cathode terminal and earth terminal that current control unit is coupled to the first light emitting diode, and according to the time straighten the voltage swing of stream voltage, optionally conducting the first light emitting diode is to the first current path between earth terminal.Second determines between cathode terminal and earth terminal that current control unit is coupled to the second light emitting diode.When the first current path conducting, second determine current control unit according to the time straighten stream voltage voltage swing, optionally the first light emitting diode of conducting series connection and the second light emitting diode be to the second current path between earth terminal, and end according to this first current path.
In sum, the light-emitting diode (LED) module that the embodiment of the present invention provides and drive circuit thereof can avoid using the wire-wound inductor of higher cost, and utilize less and circuit element lower cost to drive light-emitting diode.
For enabling further to understand feature of the present invention and technology contents, refer to following about detailed description of the present invention and accompanying drawing, but these explanations with appended graphic be only for the present invention is described, but not claim scope of the present invention is done to any restriction.
The accompanying drawing explanation
Fig. 1 is the circuit diagram of the constant-current driver of traditional light-emitting diode.
Fig. 2 is the circuit diagram of the light-emitting diode (LED) module of the embodiment of the present invention.
Fig. 3 be the embodiment of the present invention after bridge rectifier the time straighten stream voltage oscillogram.
Fig. 4 is the circuit block diagram of determining current control unit of the embodiment of the present invention.
Fig. 5 A is the oscillogram of electric current of the first current path of the embodiment of the present invention.
Fig. 5 B is the oscillogram of electric current of the second current path of the embodiment of the present invention.
Fig. 6 is the circuit diagram of the light-emitting diode (LED) module of the embodiment of the present invention.
Fig. 7 is the circuit diagram of the light-emitting diode (LED) module of another embodiment of the present invention.
Fig. 8 is the circuit diagram of determining current control unit of the parallel connection of another embodiment of the present invention.
[main element symbol description]
1: constant-current driver
11: AC/DC converter
12: determine current control unit
121: coil inductance
122: MOS (metal-oxide-semiconductor) memory
123: diode
124: electric capacity
125, R
1～R
6, R
N, R
11, R
21, R
N1, R
12, R
22, R
N2: resistance
126: comparator
127: voltage control unit
13,210,220, M
1, M
2, M
N, 700,710: light emitting diode
210a, 220a: anode tap
210b, 220b: cathode terminal
130, D
1, D
J, D
K: light-emitting diode
GND: earth terminal
2,6,7: light-emitting diode (LED) module
200,600: bridge rectifier
CS
1, CS
2, CS
N, CS
2A, CS
2B: determine current control unit
250,610,730: bleeder circuit
280: voltage gain circuit
290: voltage-current converter circuit
Embodiment
(embodiment of light-emitting diode (LED) module and drive circuit thereof)
The light-emitting diode (LED) module of the embodiment of the present invention and drive circuit thereof can make the direct voltage (positive half cycle string ripple) of light-emitting diode receiving cycle, and sequentially periodically conducting or close light-emitting diode (or light emitting diode).When the light-emitting diode conducting, light-emitting diode (LED) module and drive circuit thereof can make the electric current that flows through light-emitting diode for to determine electric current, so the brightness stability of light-emitting diode.The pressure drop that the bleeder circuit that the light-emitting diode (LED) module of the present embodiment and drive circuit thereof have can produce varying level when light-emitting diode receives the direct voltage of positive half cycle string ripple, and sequentially close accordingly or current control unit is determined in conducting.Please refer to the detailed description of follow-up light-emitting diode (LED) module and drive circuit thereof for the embodiment of the present invention.
Please refer to Fig. 2, Fig. 2 is the circuit diagram of the light-emitting diode (LED) module of the embodiment of the present invention.Light-emitting diode (LED) module 2 comprises bridge rectifier 200, light emitting diode 210,220, determines current control unit CS
1, CS
2With bleeder circuit 250.Light emitting diode 210,220 has the light-emitting diode of a plurality of series connection.Take Fig. 2 as example, and light emitting diode 210 has light-emitting diode D
1～D
J(be J light-emitting diode, wherein J is positive integer), light emitting diode 220 has light-emitting diode D
1～D
K(be K light-emitting diode, wherein K is positive integer).Bleeder circuit has resistance R
1, R
2.
It is worth mentioning that, the number of the light emitting diode that the light-emitting diode (LED) module 2 in Fig. 2 has (210,220) is two, but therefore the present invention does not limit, and the execution mode with light-emitting diode (LED) module of plural light emitting diode will illustrate in follow-up embodiment.In addition, in light-emitting diode (LED) module 2, the circuit except light emitting diode 210,220 is the LED driving circuit that drives light-emitting diode 210,220.
Referring to Fig. 2 and Fig. 3, Fig. 3 be the embodiment of the present invention after bridge rectifier the time straighten stream voltage oscillogram.Bridge rectifier 200 straightens stream voltage V when alternating voltage AC is rectified into
B.When alternating voltage AC flows through bridge rectifier 200, bridge rectifier 200 can be by alternating voltage AC rectification positive half cycle string ripple the time straighten stream voltage V
B.Shi Bianzhi stream voltage V
BCan increase in time and increase magnitude of voltage, reaching maximum during to 1/4 cycle (1/4T) of string ripple.Reach again minimum voltage while gradually reducing afterwards 1/2 cycle (1/2T).In other words, alternating voltage AC after over commutation, the time straighten stream voltage VB can be with 1/2nd cycles of alternating voltage AC frequency repeatedly to light emitting diode 210,220 power supplies.It is worth mentioning that, therefore the present invention does not limit while being obtained by alternating voltage AC and straightens stream voltage V
BMode, bridge rectifier 200 can be replaced with other half-wave rectifier or full-wave rectifier, wherein in general the power-efficient of full-wave rectifier is higher than half-wave rectifier.
Pass through to determine current control unit CS between light emitting diode 210 and earth terminal
1Form the first constant current path ICH
1.Determine current control unit CS
1And CS
2When negative terminal (-) voltage of input is less than anode (+) voltage, can produce constant current ICH respectively
1And ICH
2Otherwise, if, when negative terminal (-) voltage of input is greater than anode (+) voltage, determines current control unit and can close, now electric current is 0.Pass through to determine current control unit CS between the light emitting diode 210,220 of series connection and earth terminal GND
2Form the second constant current path ICH
2.The light emitting diode 210,220 of series connection straightens stream voltage V while receiving
B, straightened at that time stream voltage V
BDuring higher than the conducting voltage VF1 of light emitting diode 210,210 conductings of light emitting diode are also luminous.Straightened at that time stream voltage V
BDuring higher than the conducting voltage (VF1+VF2) of light emitting diode 210,220 of series connection, light emitting diode 210,220 conductings simultaneously luminous.V now
1Voltage can be because of the second constant current path ICH
2Electric current pour into resistance R
2And become large, cause and determine current control unit CS
1Negative terminal (-) voltage of input is greater than anode (+) voltage, makes to determine current control unit CS
1Close constant current source.Light emitting diode 210 is by D
1To D
JDeng light-emitting diode, be in series, thus the light-emitting diode of total J series connection, if the conducting voltage of each light-emitting diode is made as V
F, the required conducting voltage of light emitting diode 210 is V
F* J=VF1.Light emitting diode 220 is by D
1To D
KDeng light-emitting diode, be in series, thus the light-emitting diode of total K series connection, so the required conducting voltage of light emitting diode 220 is V
F* K=VF2.Voltage strides across 1/4T week after date and descends gradually, when voltage lower than VF1+VF2 but while being greater than VF1, light emitting diode 220 can be closed, now the second constant current path ICH
2Electric current be 0, V
1Voltage drop, this causes determines current control unit CS
1Conducting, current path returns again determines current control unit CS
1.As voltage during again lower than VF1 voltage, light emitting diode 210,220 and determines current control unit CS
1And CS
2Close simultaneously, now complete the samsara of one-period.
Multiple with reference to Fig. 2, bleeder circuit 250 with determine current control unit CS
1Coupling of voltage detecting end (not icon) a little there is the first feedback voltage V
1, bleeder circuit 250 with determine current control unit CS
2(not shown) of voltage detecting end couple and a little there is the second feedback voltage V
2.In Fig. 2, bleeder circuit 250 is by resistance R
1～R
3The formation of connecting, but therefore the present invention does not limit.Other execution modes of bleeder circuit of the present invention will illustrate in follow-up embodiment.
Referring to Fig. 2 and Fig. 4, Fig. 4 is the circuit block diagram of determining current control unit of the embodiment of the present invention.Fig. 2 determines current control unit CS
1, CS
2All there is reference voltage end VP, voltage detecting end VN, current input terminal I
InWith current output terminal I
out, as shown in Fig. 4 left side.Determine current control unit CS
1, CS
2Receive respectively reference voltage VR
1, VR
2, reference voltage VR
1, VR
2By resistance R
3, R
4, R
5To voltage V
DD1Dividing potential drop produces, and reference voltage VR
2Higher than reference voltage VR
1.Determine current control unit CS
1Current input terminal I
InCouple light emitting diode 210,220, determine current control unit CS
1Voltage detecting end VN couple and determine current control unit CS
1The current output terminal I of itself
out, determine current control unit CS
1Voltage detecting end VN and the point (with resistance R 1 couple a little) that couples of bleeder circuit 250 there is the first feedback voltage V
1, so can cause and determine current control unit CS
1Negative feedback paths.
Determine current control unit CS
2Current input terminal I
InCouple light emitting diode 220, determine current control unit CS
2Voltage detecting end VN couple and determine current control unit CS
2The current output terminal I of itself
out, determine current control unit CS
2Voltage detecting end VN and the point that couples of bleeder circuit 250 (be resistance R
1With resistance R
2Between) there is the second feedback voltage V
2.It is worth mentioning that, in the present embodiment, current control unit CS
2Current output terminal I
outCouple and determine current control unit CS
1Current output terminal I
out, above-mentioned connected mode makes resistance R
1To be connected across current control unit CS
2Current output terminal I
outAnd, between voltage detecting end VN, so caused current control unit CS
2Negative feedback paths.
Multiple simultaneously with reference to Fig. 2 and Fig. 4, determine current control unit CS
1, CS
2Stream can be equivalent to voltage gain circuit 280 and voltage-current converter circuit 290, as shown in the right-hand part of Fig. 4.Voltage gain circuit 280 can produce voltage gain according to the difference value by reference voltage end VP and the received voltage of voltage detecting end VN.Such as: voltage gain circuit 280 can be an operational amplifier (Operation Amplifier) or comparator (comparator) etc., reference voltage end VP and voltage detecting end VN are respectively the non-inverting inputs (Non-inverted Input) and reverse input end (Inverted Input) of operational amplifier, but therefore the present invention does not limit.Voltage-current converter circuit 290 is controlled by the voltage gain of voltage gain circuit 280, and On current input I accordingly
InWith current output terminal I
out.Voltage-current converter circuit 290 can be for example a mos field effect transistor (MOSFET), but therefore the present invention does not limit.
In other words, determine current control unit CS
1Can compare the first reference voltage level VR
1With the first feedback voltage V
1Voltage swing, determine whether On current input I
InWith current output terminal I
out, whether determine conducting the first current path ICH
1.Same, determine current control unit CS
2Can compare the second reference voltage level VR
2With the second feedback voltage V
2Voltage swing, determine whether On current input I
InWith current output terminal I
out, whether determine conducting the second current path ICH
2.
Referring to Fig. 2, Fig. 4 and Fig. 5 A, Fig. 5 A is the oscillogram of electric current of the first current path of the embodiment of the present invention.The time straighten stream voltage V
BOnly be enough in the situation of conducting light emitting diode 210 the first current path ICH
1Electric current as shown in Figure 5A.Suppose to determine current control unit CS
1 Voltage gain device 280 approach infinities, in Fig. 2, under the effect due to negative feedback loop and large voltage gain device, determine current control unit CS
1The first feedback voltage V of voltage detecting end VN
1Can approach but lower than the first reference voltage VR
1So, determine current control unit CS
1Can produce very close to VR
1/ (R
1+ R
2) determine electric current.In other words, first determines current control unit CS
1Current value (the VR carried
1/ (R
1+ R
2)) according to the first reference voltage VR
1With first determine current control unit CS
1Voltage detecting end VN to the total resistance value (R between earth terminal GND
1+ R
2) decide.
Briefly, determine current control unit CS
1Can according to the time straighten stream voltage V
BVoltage swing, the first current path ICH between the cathode terminal of conducting diode unit 210 and earth terminal GND optionally
1.Straightened at that time stream voltage V
BDuring higher than the conducting voltage VF1 of light emitting diode 210 and lower than the conducting voltage (VF1+VF2) of the light emitting diode 210,220 of series connection, determine current control unit CS
1Conducting the first current path ICH
1, and make the first current path ICH of light emitting diode 210
1In electric current remain unchanged.
Referring to Fig. 2, Fig. 4 and Fig. 5 B, Fig. 5 B is the oscillogram of electric current of the second current path of the embodiment of the present invention.Straightened at that time stream voltage V
BMagnitude of voltage continue to increase and during higher than the conducting voltage (VF1+VF2) of the light emitting diode 210,220 of series connection, light emitting diode 210,220 conducting simultaneously, light emitting diode 220 starts to have electric current to flow through and is luminous, now determines current control unit CS
2(current control unit CS flows through to start generation current
2Current input terminal I
InWith current output terminal I
out), and through resistance R
1With R
2And be conducting to earth terminal GND.Due to degenerative effect, determine current control unit CS
2The second feedback voltage V of voltage detecting end VN
2Can approach but lower than reference voltage VR
2So, determine current control unit CS
2Can produce very close to VR
2/ R
2Determine electric current.
In other words, second determines current control unit CS
2Current value (the VR carried
2/ R
2) according to the second reference voltage VR
2With second determine current control unit CS
2Voltage detecting end VN to the total resistance value (R between earth terminal GND
2) decide.The second feedback voltage V now
2Level off to the second reference voltage VR
2, can make the first feedback voltage V
1Voltage is drawn high to cause determines current control unit CS
1Close (i.e. On current control unit CS not
2Current input terminal I
InWith current output terminal I
out), and then end the first current path ICH
1.
Briefly, in the second current path ICH
2During conducting, determine current control unit CS
2Can according to the time straighten stream voltage V
BVoltage swing, the second current path ICH between the light emitting diode 210,220 to earth terminal GND of conducting series winding optionally
2, and end according to this first current path ICH
1.As direct voltage V
BDuring higher than the conducting voltage (VF1+VF2) of light emitting diode 210,220 of series connection, determine current control unit CS
2Conducting the second current path ICH
2, and make the second current path ICH of light emitting diode 210,220 of series connection
2In electric current remain unchanged.
Multiple simultaneously with reference to Fig. 2, Fig. 4 and Fig. 5 A, when the time, through 1/4 week after date, in time, straightened and flows voltage V
BDescend gradually.At voltage during lower than the conducting voltage (VF1+VF2) of the light emitting diode 210,220 of series connection but higher than the conducting voltage (VF1) of light emitting diode 210, light emitting diode 220 can end, surplus light emitting diode 210 conductings, now current path returns to again the first current path ICH
1.As previously mentioned, determine current control unit CS
1To produce very close to VR
1/ (R
1+ R
2) determine electric current.Straightened at that time stream voltage V
BContinue toward descending, and the time straighten stream voltage V
BDuring lower than the conducting voltage (VF1) of light emitting diode 210, light emitting diode 210 with determine current control unit CS
1Close (not conducting) simultaneously, now complete the circulation of one-period.
Referring to Fig. 2, Fig. 4 and Fig. 6, Fig. 6 is the circuit diagram of the light-emitting diode (LED) module of the embodiment of the present invention.Light-emitting diode (LED) module of the present invention can have a plurality of light emitting diodes, and the light-emitting diode (LED) module 6 of Fig. 6 has the light emitting diode of N series connection, and wherein N is positive integer.Light-emitting diode (LED) module 6 comprises bridge rectifier 600, light emitting diode M
1～M
N, determine current control unit CS
1～CS
NWith bleeder circuit 610.Bleeder circuit 610 comprises the resistance R of series connection
1～R
N.Light-emitting diode (LED) module 6 is roughly the same with the light-emitting diode (LED) module of Fig. 2, and its difference only is that light-emitting diode (LED) module 6 has N light emitting diode and determines current control unit with N, and bleeder circuit 610 is the resistance R of contacting
1～R
N, and determine current control unit CS
1～CS
NCouple respectively resistance R
1～R
NTo obtain feedback voltage separately.
In more detail, determine current control unit CS for the 3rd
3(not icon) determines current control unit (CS with follow-up
4～CS
N) current output terminal I separately
outBe connected to and determine current control unit CS
1Current output terminal I
out, and the 3rd determined current control unit CS
3(not icon) determines current control unit (CS with follow-up
4～CS
N) voltage detecting end VN separately contact resistance R sequentially respectively
3～R
N, so caused and determined current control unit CS
3～CS
NNegative feedback paths separately.In other words, determine current control unit CS
3～CS
NCan form the 1st grade of constant current source to the N level.
Light-emitting diode (LED) module 6 is roughly the same with the operating principle of the light-emitting diode (LED) module 2 of Fig. 2, light-emitting diode (LED) module 6 is that the constant current source of two-stage that the light-emitting diode (LED) module of Fig. 22 is had is extended for the constant current source of multistage (N level), and when the constant current source conducting of next stage, the constant current source of previous stage all can be closed (not conducting), and then ends the current path of determining of previous stage.In other words, when determining current control unit CS
2During conducting, determine current control unit CS
1Be closed, and then end the first current path ICH
1.When determining current control unit CS
3During conducting, determine current control unit CS
2Be closed, and then end the second current path ICH
2.When determining current control unit CS
NDuring conducting, determine current control unit CS
N-1Be closed, and then end N-1 current path (not icon).
In more detail, straightened at that time stream voltage V
BOnly be enough to conducting light emitting diode M
1The time, determine current control unit CS
1Maintain conducting light emitting diode M
1Determine electric current.Straightened at that time stream voltage V
BBe enough to conducting light emitting diode M
1, M
2The time, determine current control unit CS
2Maintain conducting light emitting diode M
1, M
2Determine electric current, and the front one-level determine current control unit CS
1Be closed (not conducting), and then end the first current path ICH
1.Straightened at that time stream voltage V
BBe enough to conducting light emitting diode M
1～M
3The time, determine current control unit CS
3Maintain conducting light emitting diode M
1～M
3Determine electric current, and the front two-stage determine current control unit CS
1, CS
2Be closed (not conducting), and then end the second current path ICH
2(the first current path ICH
1Also be cut off).Straightened at that time stream voltage V
BBe enough to conducting light emitting diode M
1～M
NThe time, determine current control unit CS
NMaintain conducting light emitting diode M
1～M
NDetermine electric current, and front N-1 level determine current control unit CS
1～CS
N-1Be closed (not conducting), and then the current path of cut-off front N-1 level.
(another embodiment of light-emitting diode (LED) module and drive circuit thereof)
Please refer to Fig. 7, Fig. 7 is the circuit diagram of the light-emitting diode (LED) module of another embodiment of the present invention.Light-emitting diode (LED) module 7 comprises light emitting diode 700,710, determines current control unit CS
1, parallel circuits 730, bleeder circuit 740 and resistance R
4～R
6.Light emitting diode 700 comprises J light-emitting diode (D1～DJ), and light emitting diode 710 comprises K light-emitting diode (D
1～D
K), parallel circuits 730 is by determining current control unit CS
2A, CS
2BInstitute is in parallel to be formed, and also determines current control unit CS
2BCurrent control unit CS is determined in parallel connection
2A.Bleeder circuit 740 comprises resistance R
1～R
3.
In the circuit at Fig. 2 and Fig. 6, the electric current that the current path of every one-level is flowed through is not identical, and the electric current more flow through in rear class can be healed greatly, so the determining current control unit and can bear larger thermal source of rear class, thermal source may make element over-temperature and cause the problems such as the excessive or damage of resistance.Light-emitting diode (LED) module 7 is roughly the same with the light-emitting diode (LED) module 2 of Fig. 2, and its difference only is that the light-emitting diode (LED) module 7 of Fig. 7 can, by the large electric current of rear class, on average be scattered in two and determine current control unit CS
2A, CS
2BUpper, so can reduce and determine current control unit CS
2A, CS
2BIn each thermal source born.Can contribute to the heat radiation of whole system, extend component life etc.
Multiple simultaneously with reference to Fig. 2 and Fig. 7, the difference of the bleeder circuit 250 of the bleeder circuit 730 of light-emitting diode (LED) module 7 and the light-emitting diode (LED) module 2 of Fig. 2 is the resistance R of bleeder circuit 730
2, R
3Parallel connection, resistance R in parallel
2, R
3Pass through again resistance R
1Be connected to earth terminal GND.Yet therefore the present invention does not limit the connected mode of the resistance had of bleeder circuit (250,610,730).
Determine current control unit CS
1Current output terminal I
outPass through resistance R
1Be connected to earth terminal GND, determine current control unit CS
2Current output terminal I
outPass through resistance R
1, R
2Be connected to earth terminal GND, determine current control unit CS
3Current output terminal I
outPass through resistance R
1, R
3Be connected to earth terminal GND.Light-emitting diode (LED) module 7 make flowing mode, can, with reference to the explanation of front embodiment, wherein determine current control unit CS
3Make flowing mode and determine current control unit CS
2Identical.Briefly, straightened at that time stream voltage V
BWhile only being enough to conducting light-emitting diode (LED) module 700, determine current control unit CS
1What maintain conducting light-emitting diode (LED) module 700 determines electric current VR
1/ R
1(i.e. the first current path ICH
1Electric current).Straightened at that time stream voltage V
BBe enough to the light-emitting diode (LED) module of conducting simultaneously at 700,710 o'clock, determine current control unit CS
2Maintain and determine electric current VR
2/ (R
1+ R
2) (be current path ICH
2AElectric current), and determine current control unit CS
3Maintain and determine electric current VR
2/ (R
1+ R
3) (being the electric current of current path ICH2B).Be enough to the light-emitting diode (LED) module of conducting simultaneously at 700,710 o'clock at direct voltage VB, higher than reference voltage VR1, can make via the resistance value of suitable design resistance R 2, R3 to determine the first feedback voltage V of the current output terminal Iout of current control unit CS1 due to reference voltage VR2
1Higher than reference voltage VR
1, so determine current control unit CS
1Will be closed (not conducting), and and then end the first current path ICH
1.
Referring to Fig. 7 and Fig. 8, Fig. 8 is the circuit diagram of determining current control unit of the parallel connection of another embodiment of the present invention.Parallel circuits 730 in Fig. 7 not only can be determined current control unit CS by two
2A, CS
2BInstitute is in parallel to be formed, parallel circuits 730 also can a plurality ofly determine current control unit (for example: as shown in Figure 8 determine current control unit CS
2～CS
N) formation in parallel.And each determines the current output terminal I of current control unit
outCan series resistance on the negative feedback paths that current output terminal and voltage detecting end VN form.For example: determine current control unit CS
2Current output terminal I
outSeries resistance R between current output terminal and voltage detecting end VN
11, determine current control unit CS
3Current output terminal I
outSeries resistance R between current output terminal and voltage detecting end VN
21, determine current control unit CS
N1Current output terminal I
outSeries resistance R between current output terminal and voltage detecting end VN
N1, as shown in Figure 8.
In addition, the resistance R of the parallel connection in Fig. 8
12, R
22, R
N2It is the resistance R by Fig. 7
1Extremely be connected to earth terminal GND, in other words, resistance R in parallel
12, R
22, R
N2Can with the resistance R of Fig. 7
1The circuit structure formed is the bleeder circuit 730 that is similar to Fig. 7.Determine current control unit CS shown in Fig. 8
2～CS
NDetermine current control unit CS in the mode of start and Fig. 7
2A～CS
2BThe mode of start is identical, repeats no more.
(the possible effect of embodiment)
According to the embodiment of the present invention, above-mentioned light-emitting diode (LED) module and drive circuit thereof can be to determine the current drives light-emitting diode under the situation that receives alternating current, and can avoid using wire-wound inductor and the DC-DC voltage transitions technology of higher cost, can promote power conversion efficiency, power factor (PF) with circuit unit lower cost with less.In addition, than the constant current source of rear class, can utilize the in parallel current control unit of determining effectively to disperse the electric current than rear class, make heat radiation that better efficiency be arranged.
The foregoing is only embodiments of the invention, it is not in order to limit to the scope of the claims of the present invention.
Claims (14)
1. a light-emitting diode (LED) module, is characterized in that, comprising:
One first light emitting diode, the anode tap of described the first light emitting diode straightens stream voltage for the moment in order to receive;
One second light emitting diode, the cathode terminal of described first light emitting diode of anode tap coupled in series of described the second light emitting diode;
One first determines current control unit, be coupled between the cathode terminal and an earth terminal of described the first light emitting diode, foundation straightens the voltage swing of stream voltage when described, optionally described the first light emitting diode of conducting is to one first current path between described earth terminal; And
One second determines current control unit, be coupled between the cathode terminal and described earth terminal of described the second light emitting diode, when described the first current path conducting, described second determines the voltage swing that current control unit straightens stream voltage when described, described the first light emitting diode that optionally conducting is connected and described the second light emitting diode be one second current path between described earth terminal extremely, and ends according to this described the first current path.
2. light-emitting diode (LED) module according to claim 1, is characterized in that, straightens stream voltage while being less than the conducting voltage of described the first light emitting diode when described, and described first determines current control unit ends described the first current path; While straightening stream voltage higher than the conducting voltage of described the first light emitting diode and lower than the conducting voltage of described first light emitting diode of series connection and described the second light emitting diode when described, described first determines described the first current path of current control unit conducting and the electric current in described the first current path is remained unchanged; While straightening stream voltage higher than described first light emitting diode of series connection and the conducting voltage of described the second light emitting diode when described, described second determines described the second current path of current control unit conducting and the electric current in described the second current path is remained unchanged.
3. light-emitting diode (LED) module according to claim 2, it is characterized in that, also comprise: a bleeder circuit, being coupled to described first determines current control unit, described second and determines between current control unit and described earth terminal, the coupling of one first voltage detecting end that described bleeder circuit and described first is determined current control unit a little has one first feedback voltage, and the coupling of a second voltage test side that described bleeder circuit and described second is determined current control unit a little has one second feedback voltage.
4. light-emitting diode (LED) module according to claim 3, it is characterized in that, described first determines current control unit has one first current input terminal and one first current output terminal, described the first current input terminal couples respectively the cathode terminal of described the first light emitting diode and the anode tap of described the second light emitting diode, described first determines the voltage swing that current control unit compares one first reference voltage and described the first feedback voltage, determine whether described the first current input terminal of conducting and described the first current output terminal, when described the first current input terminal and described the first current output terminal are switched on, the described first one first current value of determining the current control unit carrying decides according to described the first reference voltage and described the first voltage detecting end to the total resistance value between described earth terminal.
5. light-emitting diode (LED) module according to claim 4, it is characterized in that, described second determines current control unit has a second voltage test side, one second current input terminal and one second current output terminal, described the second current input terminal couples the cathode terminal of described the second light emitting diode, described second determines current control unit relatively higher than one second reference voltage of described the first reference voltage and the voltage swing of described the second feedback voltage, determine whether described the second current input terminal of conducting and described the second current output terminal, when described the second current input terminal and described the second current output terminal are switched on, the described second one second current value of determining the current control unit carrying decides according to described the second reference voltage and described second voltage test side to the total resistance value between described earth terminal, now described second determines current control unit and makes described the first feedback voltage be greater than described the first reference voltage, the described first described the first current input terminal and described the first not conducting of current output terminal of determining current control unit by this.
6. light-emitting diode (LED) module according to claim 5, is characterized in that, also comprises:
One the 3rd determines current control unit, in parallel described second determines current control unit, there is a tertiary voltage test side, one the 3rd current input terminal and one the 3rd current output terminal, described the 3rd current input terminal couples the cathode terminal of described the second light emitting diode, described tertiary voltage test side couples described bleeder circuit, the place of coupling of described tertiary voltage test side and described bleeder circuit has one the 3rd feedback voltage, the described the 3rd determines the voltage swing of more described the second reference voltage of current control unit and described the 3rd feedback voltage, determine whether described the 3rd current input terminal of conducting and described the 3rd current output terminal, wherein when described the 3rd current input terminal and described the 3rd current output terminal are switched on, the described the 3rd determine one the 3rd current value that current control unit carries according to described the second reference voltage and described tertiary voltage test side extremely the total resistance value between described earth terminal decide.
7. light-emitting diode (LED) module according to claim 1, is characterized in that, also comprises:
One rectifier, couple the anode tap of described the first light emitting diode, straightens stream voltage when an ac voltage rectifier is become to described.
8. a LED driving circuit, is characterized in that, in order to provide, through bridge rectifier, crosses
Straighten for the moment one first light emitting diode and one second light emitting diode that stream voltage drives series connection, described LED driving circuit comprises:
One first determines current control unit, be coupled between the cathode terminal and an earth terminal of described the first light emitting diode, foundation straightens the voltage swing of stream voltage when described, optionally described the first light emitting diode of conducting is to one first current path between described earth terminal; And
One second determines current control unit, be coupled between the cathode terminal and described earth terminal of described the second light emitting diode, when described the first current path conducting, described second determines the voltage swing that current control unit straightens stream voltage when described, described the first light emitting diode that optionally conducting is connected and described the second light emitting diode be one second current path between described earth terminal extremely, and ends according to this described the first current path.
9. LED driving circuit according to claim 8, is characterized in that, straightens stream voltage while being less than the conducting voltage of described the first light emitting diode when described, and described first determines current control unit ends described the first current path; While straightening stream voltage higher than the conducting voltage of described the first light emitting diode and lower than the conducting voltage of described first light emitting diode of series connection and described the second light emitting diode when described, described first determines described the first current path of current control unit conducting and the electric current in described the first current path is remained unchanged; While straightening stream voltage higher than described first light emitting diode of series connection and the conducting voltage of described the second light emitting diode when described, described second determines described the second current path of current control unit conducting and the electric current in described the second current path is remained unchanged.
10. LED driving circuit according to claim 9, is characterized in that, also comprises:
One bleeder circuit, being coupled to described first determines current control unit, described second and determines between current control unit and described earth terminal, the coupling of one first voltage detecting end that described bleeder circuit and described first is determined current control unit a little has one first feedback voltage, and the coupling of a second voltage test side that described bleeder circuit and described second is determined current control unit a little has one second feedback voltage.
11. LED driving circuit according to claim 8, is characterized in that, also comprises:
One rectifier, straighten stream voltage when an ac voltage rectifier is become to described.
12. LED driving circuit according to claim 8, it is characterized in that, described first determines current control unit has one first current input terminal and one first current output terminal, described the first current input terminal couples respectively the cathode terminal of described the first light emitting diode and the anode tap of described the second light emitting diode, described first determines the voltage swing that current control unit compares one first reference voltage and described the first feedback voltage, determine whether described the first current input terminal of conducting and described the first current output terminal, when described the first current input terminal and described the first current output terminal are switched on, the described first described the first reference voltage of foundation and described the first voltage detecting end to total resistance value between described earth terminal of determining one first current value of current control unit carrying decides.
13. LED driving circuit according to claim 12, it is characterized in that, described second determines current control unit has a second voltage test side, one second current input terminal and one second current output terminal, described the second current input terminal couples the cathode terminal of described the second light emitting diode, described second determines current control unit relatively higher than one second reference voltage of described the first reference voltage and the voltage swing of described the second feedback voltage, determine whether described the second current input terminal of conducting and described the second current output terminal, when described the second current input terminal and described the second current output terminal are switched on, the described second one second current value of determining the current control unit carrying decides according to described the second reference voltage and described second voltage test side to the total resistance value between described earth terminal, now described second determines current control unit and makes described the first feedback voltage be greater than described the first reference voltage, the described first described the first current input terminal and described the first not conducting of current output terminal of determining current control unit by this.
14. LED driving circuit according to claim 13, is characterized in that, also comprises:
One the 3rd determines current control unit, in parallel described second determines current control unit, there is a tertiary voltage test side, one the 3rd current input terminal and one the 3rd current output terminal, described the 3rd current input terminal couples the cathode terminal of described the second light emitting diode, described tertiary voltage test side couples described bleeder circuit, the place of coupling of described tertiary voltage test side and described bleeder circuit has one the 3rd feedback voltage, the described the 3rd determines the voltage swing of more described the second reference voltage of current control unit and described the 3rd feedback voltage, determine whether described the 3rd current input terminal of conducting and described the 3rd current output terminal, wherein when described the 3rd current input terminal and described the 3rd current output terminal are switched on, the described the 3rd determine one the 3rd current value that current control unit carries according to described the second reference voltage and described tertiary voltage test side extremely the total resistance value between described earth terminal decide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101594313A CN103428939A (en) | 2012-05-21 | 2012-05-21 | Light emitting diode module and driving circuit of light emitting diode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101594313A CN103428939A (en) | 2012-05-21 | 2012-05-21 | Light emitting diode module and driving circuit of light emitting diode |
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| CN105323910A (en) * | 2014-07-11 | 2016-02-10 | 株式会社流明斯 | Lighting device and light-emitting device |
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