CN103889127B - Without the linear LED drive module of stroboscopic and method of work thereof - Google Patents
Without the linear LED drive module of stroboscopic and method of work thereof Download PDFInfo
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Abstract
The invention discloses a kind of without the linear LED drive module of stroboscopic, comprise analog digital controll block, LED load module, power control switching; Described LED load module is: LED load and current source I
lEDbeing in series into a branch road, is LED load and current source I
lEDbranch road; Storage capacitor C
dwith above-mentioned LED load and current source I
lEDbranch road is in parallel and forms LED load module; Analog digital controll block controls power control switching according to the output signal of LED load module.Described analog digital controll block is made up of operational amplifier, comparator and digital circuit; Described power control switching is the diverter switch be made up of active switch and passive switch.Adopt several linear LED drive module without stroboscopic of the present invention and linear current source I
iNafter combination, the system of gained has following high efficiency, LED output light does not have the technical advantages such as stroboscopic.
Description
Technical field
The present invention relates to a kind of without the linear LED drive module of stroboscopic and method of work thereof.
Background technology
Relative switching mode LED drive power, linear LED drive power can be saved very complicated EMI problem and makes the design of this linear LED drive power and implement fairly simple.In the application of high voltage-small current, its (linear LED drive power) has unique advantage.In the alternating current-direct current Linear Driving scheme extensively implemented at present, main efficiency and the power factor adopting drive part by part mode (as shown in Figure 1) to improve Linear Driving power supply.In alternating current-direct current drive part by part scheme, linear current source goes interrupted driving LED load with certain duty ratio.Drive current due to LED is an interrupted electric current, and the problem existing for this scheme is that the light efficiency utilance of LED is low, and LED is the stroboscopic with twice mains frequency.Improve the light efficiency utilance of LED, and overcome the stroboscopic of this twice mains frequency, wish that the drive current of this LED is a continuous print direct driving current.
The drive current that the simplest method reaches LED is a continuous print and method close to direct driving current is a bulky capacitor C in parallel in LED load
dcarry out energy storage (as shown in Figure 2).Although linear current source removes driving LED load and large storage capacitor C with certain duty ratio
d, due to bulky capacitor C
denergy storage, this makes LED continue have drive current to become possibility.The product TPS92411 of Texas Instrument adopts this thinking to form LED drive module.In this drive part by part scheme, the LED drive module combination that several TPS92411 are formed just can make the efficiency of this Linear Driving scheme and power factor high, and there is no the problem of EMI.But in this LED drive module, the ripple size of LED drive current is by this bulky capacitor C
ddetermine with the cycle T of the timeconstantτ of LED load and the duty ratio of linear current source.Obvious τ is more greater than T, and the ripple of this drive current is less.LED load can be regarded as by a voltage source V
lEDwith a dynamic electric resistor R
dbe in series.This bulky capacitor C
dcan be expressed as follows with the timeconstantτ of LED load:
τ＝C
D．R
D；
The dynamic electric resistor R of LED load
dnormally smaller; Make electric capacity C
dlarge with the timeconstantτ of LED load, electric capacity C will be made
dbe worth large as far as possible.There is the problem of cost performance in this.How to increase electric capacity C
dwith the timeconstantτ of LED drive module, make the ripple of this drive current little as far as possible, and without the need to increasing considerably electric capacity C
dvalue is the problem that the industry urgently wishes to solve at present.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of high efficiency, linear LED drive module without stroboscopic.
In order to solve the problems of the technologies described above, the invention provides a kind of without the linear LED drive module of stroboscopic, comprising analog digital controll block, LED load module, power control switching;
Described LED load module is: LED load and current source I
lEDbeing in series into a branch road, is LED load and current source I
lEDbranch road; Storage capacitor C
dwith above-mentioned LED load and current source I
lEDbranch road is in parallel and forms LED load module;
Analog digital controll block controls power control switching according to the output signal of LED load module.
As the improvement without the linear LED drive module of stroboscopic of the present invention:
Described analog digital controll block is made up of operational amplifier, comparator and digital circuit;
Described power control switching is the diverter switch be made up of active switch and passive switch.
As the further improvement without the linear LED drive module of stroboscopic of the present invention:
LOGIC module contains operational amplifier and digital circuit;
Described active switch is K switch;
Described passive switch is diode D;
Linear current source I
iNthe linear LED drive module without stroboscopic is driven through IN+ and IN-end;
Current source I
lEDterminal voltage be connected with one of input of the comparator of the comparator of corresponding V1, corresponding V2, the comparator of corresponding V3 respectively; Another input of the comparator of the comparator of above-mentioned corresponding V1, the comparator of corresponding V2, corresponding V3 is connected with the reference level of V1, V2, V3 respectively;
The output of the comparator of corresponding V1, the comparator of corresponding V2, the comparator of corresponding V3 is the input of LOGIC module; The input of this LOGIC module is also CONT input simultaneously;
K switch is controlled by LOGIC module; The two ends of K switch are respectively linear current source I
iNiN+ end and IN-hold;
Diode D is in parallel with the two ends of K switch with the branch road formed after LED load block coupled in series;
OUT1 and OUT2 is respectively the output of LOGIC module.
As the further improvement without the linear LED drive module of stroboscopic of the present invention:
The output OUT1 of LOGIC module controls current source I
lEDsize.
As the further improvement without the linear LED drive module of stroboscopic of the present invention:
The described linear LED drive module without stroboscopic also comprises resistance Rs and corresponding two LOGIC module inputs; Hold series resistance Rs at the IN-of the linear LED drive module without stroboscopic, two inputs of above-mentioned LOGIC module are connected with the two ends of resistance Rs respectively.
The present invention also provides simultaneously and utilizes the above-mentioned linear LED drive system of the alternating current-direct current without stroboscopic be prepared from without the linear LED drive module of stroboscopic: at least 2 without after the series connection of stroboscopic linear LED drive module, with one outside be attached with the linear current source I of communication function
iNcombination.
The present invention also provides simultaneously and utilizes above-mentioned a kind of method of work without the linear LED drive module of stroboscopic:
When input CONT is low level " 0 ", the conducting of LOGIC module controls K switch; IN+ and IN-without the linear LED drive module of stroboscopic holds by K switch conducting short circuit in zero level, linear current source I
iNthis linear LED drive module without stroboscopic is not powered; Only by storage capacitor C
denergy storage LED load is powered;
When input CONT is high level " 1 ", IN+ and IN-without the linear LED drive module of stroboscopic holds not by LOGIC module input CONT control switch K conducting short circuit; Hold through IN+ and IN-of the linear LED drive module without stroboscopic, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply; As current source I
lEDon terminal voltage V
iLEDlower than V1, output OUT1 is that high level feeds back to linear current source I
iNto increase input current; As current source I
lEDon terminal voltage V
iLEDv2<V
iLED<V3, LOGIC module controls K switch is opened a way, and output OUT2 is low level, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply; IN+ and IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage; But as current source I
lEDon voltage V
iLEDbe greater than V3, the conducting of LOGIC module controls K switch, output OUT2 is high level, linear current source I
iNthrough K switch short circuit, IN+ and the IN-end without the linear LED drive module of stroboscopic presents zero level, storage capacitor C
dlED load is powered; Storage capacitor C
dvoltage starts to reduce until current source I
lEDon terminal voltage V
iLEDbe less than V2; As current source I
lEDon terminal voltage V
iLEDbe less than V2, LOGIC module controls K switch is opened a way, and output OUT2 is low level, linear current source I
iNby diode D to LED load and storage capacitor C
dstart power supply; Storage capacitor C
dvoltage starts to increase until current source I
lEDon terminal voltage V
iLEDbe greater than V3; During this period, IN+ and the IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage; The switching of K switch is used to control storage capacitor C
dvoltage changes in allowed limits, namely controls the size of its ripple voltage; Due to the switching of K switch, IN+ and the IN-end without the linear LED drive module of stroboscopic will present zero level or storage capacitor C
dvoltage; The output level signal OUT1 of module and OUT2 and input CONT is undertaken combining control by participating in other linear LED drive module without stroboscopic.
The present invention also provides simultaneously and utilizes the above-mentioned another kind of method of work without the linear LED drive module of stroboscopic:
When input CONT is low level " 0 ", the conducting of LOGIC module controls K switch, the linear current source I of corresponding period demand and duty ratio
iNzero input current; This IN+ and IN-without the linear LED drive module of stroboscopic holds by K switch conducting short circuit in zero level, linear current source I
iNpowering to this linear LED drive module without stroboscopic is zero; Only by storage capacitor C
dlED load is powered;
When input CONT is high level " 1 ", the linear current source I of corresponding period demand and duty ratio
iNinput current, this IN+ and IN-without the linear LED drive module of stroboscopic holds not by LOGIC module input CONT control switch K conducting short circuit; Hold through IN+ and IN-of the linear LED drive module without stroboscopic, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply; IN+ and IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage; As current source I
lEDon voltage V
iLEDexport low reference level lower than V1, LOGIC module output OUT1 and regulate current source I
lEDvalue (makes current source I
lEDvalue reduces), thus make storage capacitor C
denough charging currents are had to carry out energy storage; As current source I
lEDon voltage V
iLEDbe be greater than V3, LOGIC module output OUT1 exports high with reference to level adjustment current source I
lEDvalue (makes current source I
lEDvalue increases), to reduce storage capacitor C
denergy storage charging current;
In every duty cycle start time, the K switch that namely LOGIC module input CONT controls turns off the moment, current source I by being conducting to
lEDon terminal voltage V
iLEDcompare with V2 reference level; Its difference is used for regulating current source I through output variable OUT1
lEDvalue; As current source I
lEDon voltage V
iLED>V2, this shows storage capacitor C
dcharging current large, current source I be increased
lEDvalue reduces storage capacitor C
dcharging current, i.e. I
iN-I
lED; As current source I
lEDon terminal voltage V
iLED<V2, this shows storage capacitor C
dcharging current little, current source I be reduced
lEDvalue increases storage capacitor C
dcharging current, i.e. I
iN-I
lED.
The present invention also provides simultaneously and utilizes above-mentioned another method of work without the linear LED drive module of stroboscopic:
Resistance R
sremove Gather and input linear current source I
iNcurrent value and through this linear current source I
iNthe digital controlled signal of transmission; Due to resistance R
svoltage drop give input queued switches current value, this is conducive to LOGIC module and produces suitable output controlled quentity controlled variable OUT1 and control current source I
lED; Linear current source I in addition
iNthe digital controlled signal of transmission is at resistance R
sthe corresponding digital signal voltage of upper generation is transferred to LOGIC module, and the Digital Signals K switch that LOGIC module inputs according to this is opened or turned off.
In above-mentioned LED load module of the present invention, current source I
lEDdynamic electric resistor can be considered to infinitely great, that is, LED load and current source I
lEDthe dynamic electric resistor R of branch road
dinfinity can be regarded as; Therefore, the timeconstantτ of the LED load module of this formation can much larger than linear current source I
iNthe cycle T of duty ratio.
It is the one order inertia system that a time constant is very large that described LED load module presents in control characteristic.The one order inertia system very large to a time constant adopts various existing control method to control this system than being easier to.
Electric current due to LED load is by current source I
lEDdetermine, linear current source I
iNduring to this LED load module for power supply, be greater than I
lEDelectric current be to storage capacitor C
dcharging; Storage capacitor C
dcharging voltage expression formula be:
Wherein V
cD(0) be the charging initial value of storage capacitor voltage.
As linear current source I
iNwhen stopping this LED load module for power supply, storage capacitor C
dto this LED load and current source I
lEDbranch road is powered, storage capacitor C
ddischarge voltage expression formula be:
Wherein V
cD(T) be storage capacitor C
dthe electric discharge initial value of voltage.
From this storage capacitor C
ddischarge and recharge expression formula is seen, as linear current source I
iNwith corresponding cycle duty ratio to this LED load module drive, storage capacitor C
dvoltage increases when charging with triangular wave patterns, reduces when discharging.As storage capacitor C
ddischarge and recharge be balance time, when namely charging charge equals discharge charge, storage capacitor C
dthe electric discharge final voltage V of voltage
cD_
f(T) be equal storage capacitor C
dthe charging initial value V of voltage
cD(0).This storage capacitor C
dthe ripple voltage of voltage is divided by storage capacitor C by charging charge or discharge charge
dvalue determines.Obviously along with storage capacitor C
dvalue increases, storage capacitor C
dthe ripple voltage of voltage reduces.
Make linear current source I
iNenergy driven LED load module, this needs to ensure storage capacitor C
ddischarge and recharge be balance, thus ensure that the operating voltage of LED load module is in controlled scope.That is, the electric discharge final voltage V of storage capacitor voltage
cD_
f(T) be the charging initial value V equaling storage capacitor voltage
cD(0).Concrete control method is: according to the electric discharge final voltage V of storage capacitor voltage
cD_
f(T) corresponding linear current source I is controlled with the gap of the final voltage of required control
iNduty when the cycle reaches, or regulate LED load and current source I
lEDthe current source I of branch road
lEDsize reach.
At LED load and current source I
lEDin branch road, because the dynamic electric resistor of LED is smaller, LED load and current source I
lEDthe dynamic electric resistor of branch road is primarily of current source I
lEDdynamic electric resistor determine.The ripple voltage of storage capacitor is by LED load and current source I
lEDvoltage drop reflection on dynamic electric resistor in branch road.Current source I
lEDon terminal voltage V
iLEDcan provide enough control informations to control the discharge and recharge of storage capacitor is balance.Control storage capacitor C
ddischarge and recharge balance, have two kinds of control methods to implement.The first controls corresponding linear current source I
iNthe duty when cycle; It two is linear current source I at period demand and duty ratio
iNcondition lowers current source I
lEDsize.
Mode one, control corresponding linear current source I
iNduty when cycle methods is as follows:
Current source I
lEDon terminal voltage V
iLEDfollowing situation analysis and control can be divided: (establishing: V1<V2<V3)
1.V
iLED<V1, shows this linear current source I
iNcurrent value be not enough to drive this LED load module, need increase linear current source I
iNcurrent value.
2.V
iLED>V3, shows that the voltage of this LED load module has exceeded its rated value, should automatically stop this linear current source I
iNto this LED load module drive.Storage capacitor C
dstart to LED load and current source I
lEDbranch road is powered.
3.V1<V
iLED<V2, shows storage capacitor C
dclose to releasing its all energy storage, need this linear current source I
iNto this LED load module automatic power.This linear current source I
iNto power and to storage capacitor C to LED load
dstorage power.
Obviously according to current source I
lEDon voltage V
iLED, the LED drive module without stroboscopic controlling diverter switch and LED load block combiner by some voltage comparators and corresponding logical circuit regulates the linear current source I of equivalence
iNinput duty cycle and cycle, like this this LED drive module without stroboscopic and external linear current source I
iNjust can form the linear LED drive module without stroboscopic.
Mode two, linear current source I in period demand and duty ratio
iNcondition lowers current source I
lEDthe method of size as follows:
Current source I
lEDon terminal voltage V
iLEDfollowing situation analysis and control can be divided: (establishing: V1<V2<V3, when the high level of duty ratio corresponding)
1.V
iLED<V1, shows this linear current source I
iNcurrent value be not enough to drive this LED load module, need to reduce the current source I in this LED load module
lEDcurrent value.
2.V
iLED>V3, shows that the voltage of this LED load module has exceeded its rated value, should increase current source I
lEDvalue is to reduce storage capacitor C
denergy storage electric current.
3. when duty ratio from low to high level time, V1<V
iLED<V2, shows storage capacitor C
dclose to releasing its all energy storage, need to reduce the current source I in this LED load module
lEDcurrent value, this linear current source I
iNstorage capacitor C will be increased
dstorage power; When duty ratio from low to high level time, V
iLED>V2, shows storage capacitor C
dthere is unnecessary energy storage, need to increase the current source I in this LED load module
lEDcurrent value.This linear current source I
iNstorage capacitor C will be reduced
dstorage power.
The linear current source I of obvious corresponding period demand and dutyfactor value
iN, according to current source I
lEDon terminal voltage V
iLED, the LED drive module without stroboscopic controlling diverter switch and LED load block combiner by some amplifiers and voltage comparator and corresponding logical circuit regulates the current source I in LED load module
lEDcurrent value, this linear LED drive module without stroboscopic and the linear current source I of external period demand and duty ratio like this
iNjust can form the linear LED drive module without stroboscopic.
In sum, the present invention in terms of existing technologies, adopts several linear LED drive module without stroboscopic of the present invention (remarks illustrate: connect each other) and linear current source I
iNafter combination, the system of gained has following technical advantage:
1, power factor can be greater than 0.9.
2, high efficiency.
3, LED is driven by Constant Direct Current electric current.
4, LED exports light does not have stroboscopic.
5, the utilance of LED module is the highest.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is existing alternating current-direct current drive part by part scheme;
The drive part by part scheme of the product TPS92411 formation of Tu2Shi Texas Instrument;
Fig. 3 is the physical circuit figure of the linear LED drive module embodiment 1 without stroboscopic of the present invention;
Fig. 4 is the physical circuit figure of the linear LED drive module embodiment 2 without stroboscopic of the present invention;
Fig. 5 be of the present invention have communication function the physical circuit figure of the linear LED drive module embodiment 3 without stroboscopic;
Fig. 6 be of the present invention have have more communication function the concrete system application circuit of the linear LED drive module without stroboscopic.
Embodiment
Embodiment 1, a kind of linear LED drive module (as shown in Figure 3) without stroboscopic,
LED load and current source I
lEDbeing in series into a branch road, is LED load and current source I
lEDbranch road; Storage capacitor C
dwith above-mentioned LED load and current source I
lEDbranch road is in parallel and forms LED load module; Linear current source drives the linear LED drive module without stroboscopic through IN+ and IN-end.The described linear LED drive module without stroboscopic comprises LOGIC module, K switch and diode D.
This LOGIC module can be formed by the corresponding analog circuit of existing operational amplifier and Digital Logical Circuits; This belongs to routine techniques.
Current source I
lEDterminal voltage be connected with one of input of the comparator of the comparator of corresponding V1, corresponding V2, the comparator of corresponding V3 respectively; Another input of the comparator of the comparator of above-mentioned corresponding V1, the comparator of corresponding V2, corresponding V3 is connected with the reference level of V1, V2, V3 respectively.
The output of the comparator of corresponding V1, the comparator of corresponding V2, the comparator of corresponding V3 is the input of LOGIC module; The input of this LOGIC module is also CONT input simultaneously.
K switch is controlled by LOGIC module; The two ends of K switch are respectively IN+ end and the IN-end of linear current source.
Diode D is in parallel with the two ends of K switch with the branch road formed after LED load block coupled in series.
OUT1 and OUT2 is respectively the output of LOGIC module.
Specific works is as follows:
When input CONT is low level " 0 ", the conducting of LOGIC module controls K switch.IN+ and IN-without the linear LED drive module of stroboscopic holds by K switch conducting short circuit in zero level, linear current source I
iNthis linear LED drive module without stroboscopic is not powered; Only by storage capacitor C
denergy storage LED load is powered.
When input CONT is high level " 1 ", IN+ and IN-without the linear LED drive module of stroboscopic holds not by LOGIC module input CONT control switch K conducting short circuit.Hold through IN+ and IN-of the linear LED drive module without stroboscopic, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply.As current source I
lEDon terminal voltage V
iLEDlower than V1, output OUT1 is that high level feeds back to linear current source I
iNto increase input current.As current source I
lEDon terminal voltage V
iLEDv2<V
iLED<V3, LOGIC module controls K switch is opened a way, and output OUT2 is low level, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply.IN+ and IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage.But as current source I
lEDon voltage V
iLEDbe greater than V3, the conducting of LOGIC module controls K switch, output OUT2 is high level, linear current source I
iNthrough K switch short circuit, IN+ and the IN-end without the linear LED drive module of stroboscopic presents zero level.Storage capacitor C
dlED load is powered.Storage capacitor C
dvoltage starts to reduce until current source I
lEDon terminal voltage V
iLEDbe less than V2.As current source I
lEDon terminal voltage V
iLEDbe less than V2, LOGIC module controls K switch is opened a way, and output OUT2 is low level, linear current source I
iNby diode D to LED load and storage capacitor C
dstart power supply.Storage capacitor C
dvoltage starts to increase until current source I
lEDon terminal voltage V
iLEDbe greater than V3; During this period, IN+ and the IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage.The switching of K switch is used to control storage capacitor C
dvoltage changes in allowed limits, namely controls the size of its ripple voltage.Due to the switching of K switch, IN+ and the IN-end without the linear LED drive module of stroboscopic will present zero level or storage capacitor C
dvoltage.The output level signal OUT1 of module and OUT2 and input CONT is undertaken combining control by participating in other linear LED drive module without stroboscopic.
Without the storage capacitor C in the linear LED drive module of stroboscopic
dvalue is determined by its maximum discharge charge value.If the discharge time of storage capacitor CD is TDIS, storage capacitor CD minimum value CD_MIN is:
The working method of this embodiment 1 is for described in the mode one of above-mentioned " summary of the invention ".
Further work is specifically stated as follows:
The linear current source I that obvious correspondence is given
iNwith current source I
lED, according to current source I
lEDon terminal voltage V
iLED, constitute LOGIC module by some amplifiers and voltage comparator, logical circuit; This LOGIC module controls diverter switch K, linear adjustment current source I
iNcorresponding cycle and duty ratio.
Embodiment 2, a kind of linear LED drive module (as shown in Figure 4) without stroboscopic,
This embodiment 2, for embodiment 1, is done to change as follows: the output OUT1 of LOGIC module controls current source I
lEDsize.
All the other contents are equal to embodiment 1.
Linear current source I
iNthis linear LED drive module without stroboscopic is driven through IN+ and IN-end.
When input CONT is low level " 0 ", the conducting of LOGIC module controls K switch, the linear current source I of corresponding period demand and duty ratio
iNzero input current.This IN+ and IN-without the linear LED drive module of stroboscopic holds by K switch conducting short circuit in zero level, linear current source I
iNpowering to this linear LED drive module without stroboscopic is zero; Only by storage capacitor C
dlED load is powered.
When input CONT is high level, the linear current source I of corresponding period demand and duty ratio
iNinput current, this IN+ and IN-without the linear LED drive module of stroboscopic holds not by LOGIC module input CONT control switch K conducting short circuit.Hold through IN+ and IN-of the linear LED drive module without stroboscopic, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply.IN+ and IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage.As current source I
lEDon voltage V
iLEDexport low reference level lower than V1, LOGIC module output OUT1 and regulate current source I
lEDvalue (makes current source I
lEDvalue reduces), thus make storage capacitor C
denough charging currents are had to carry out energy storage.As current source I
lEDon voltage V
iLEDbe be greater than V3, LOGIC module output OUT1 exports high with reference to level adjustment current source I
lEDvalue (makes current source I
lEDvalue increases), to reduce storage capacitor C
denergy storage charging current.
In every duty cycle start time, the K switch that namely LOGIC module input CONT controls turns off the moment, current source I by being conducting to
lEDon terminal voltage V
iLEDcompare with V2 reference level.Its difference is used for regulating current source I through output variable OUT1
lEDvalue.As current source I
lEDon voltage V
iLED>V2, this shows storage capacitor C
dcharging current large, current source I be increased
lEDvalue reduces storage capacitor C
dcharging current, i.e. I
iN-I
lED; As current source I
lEDon terminal voltage V
iLED<V2, this shows storage capacitor C
dcharging current little, current source I be reduced
lEDvalue increases storage capacitor C
dcharging current, i.e. I
iN-i
lED.
The one order inertia system very large to a time constant, to the control signal CONT of period demand and duty ratio, can according to current source I
lEDon terminal voltage V
iLEDby the output variable OUT1 of LOGIC module to current source I
lEDvalue adjustment makes through several cycle after-currents source I
lEDon terminal voltage V
iLEDvalue converges to V2 in each cycle start time.The output level signal OUT2 of module and input CONT is undertaken combining control by participating in other linear LED drive module without stroboscopic.
Without the storage capacitor C in the linear LED drive module of stroboscopic
dvalue is determined by its maximum discharge charge value.If the discharge time of storage capacitor CD is TDIS, the stable state maximum of the current source ILED in LED load module is ILED_MAX, storage capacitor C
dminimum value C
d_
mINbe:
The working method of this embodiment 2 is for described in the mode two of above-mentioned " summary of the invention ".
Further work is specifically stated as follows:
The dutyfactor value of obvious corresponding period demand, according to current source I
lEDon terminal voltage V
iLED, constitute LOGIC module by some amplifiers and voltage comparator, logical circuit; This LOGIC module controls diverter switch K, the current source I regulated in LED load module
lEDcurrent value be combined into LED drive module without stroboscopic, the linear current source I of this LED drive module without stroboscopic and external period demand and duty ratio like this
iNjust can form the linear LED drive module without stroboscopic.
Embodiment 3, a kind of linear LED drive module (as shown in Figure 5) without stroboscopic,
This embodiment 3, for embodiment 2, has done following change:
Add resistance Rs and corresponding two LOGIC module inputs.The IN-of the linear LED drive module without stroboscopic described in embodiment 2 holds series resistance Rs, and two inputs of above-mentioned LOGIC module are connected with the two ends of resistance Rs respectively.
All the other contents are with above-described embodiment 2.
The working method of this embodiment 3, under the prerequisite of working method described in above-described embodiment 2, also add following content:
In this specific embodiment, add resistance R
sremove Gather and input linear current source I
iNcurrent value and through this linear current source I
iNthe digital controlled signal of transmission.Due to resistance R
svoltage drop give input queued switches current value, this is conducive to LOGIC module and produces suitable output controlled quentity controlled variable OUT1 and control current source I
lED.Linear current source I in addition
iNthe digital controlled signal of transmission is at resistance R
sthe corresponding digital signal voltage of upper generation is transferred to LOGIC module, and the Digital Signals K switch that LOGIC module inputs according to this is opened or turned off.
Embodiment 4, the linear LED drive system of a kind of alternating current-direct current without stroboscopic (as shown in Figure 6),
The linear LED drive module (as shown in Figure 5) without stroboscopic as described in Example 3 containing 3 series connection in this system, with one outside be attached with the linear current source I of communication function
iNcombination, defines without the high efficiency LED drive system of stroboscopic alternating current-direct current High Power Factor.
Because these three the linear LED drive module without stroboscopic float to drive, they can increase this equivalent LED driving voltage gear number to reduce the increment size of LED driving voltage by the formation multiple combination shown in Fig. 2, thus reduce external linear current source I
iNpower consumption.Embody rule schematic diagram as shown in Figure 6.Wherein civil power AC full-wave rectification is powered to without the linear LED drive module 1,2,3 of stroboscopic and linear current source I by rectifier bridge A
iN.Module B produces corresponding coding according to the voltage of this input civil power AC and phase place and outputs to linear current source I
iN.This digital coding is through this linear current source I
iNthe linear LED drive module 1,2,3 be transferred to without stroboscopic goes to control to open without the K switch in the linear LED drive module of stroboscopic or turn off accordingly.Owing to being three linear LED drive module tandem compounds without stroboscopic, in each interchange half cycle, 8 plateau voltage change combinations can be had.This makes linear current source I
iNon voltage drop can be lower and make low in energy consumption, the height that the efficiency of such system is suitable.Because rectifier bridge A has sizable angle of flow and constant output current, the power factor of such system can be greater than 0.9.Because LED has constant direct current driven, LED output light does not have stroboscopic and the utilance of LED module is the highest.
Finally, it is also to be noted that what enumerate above is only several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, many distortion can also be had.All distortion that those of ordinary skill in the art can directly derive from content disclosed by the invention or associate, all should think protection scope of the present invention.
Claims (7)
1. without the linear LED drive module of stroboscopic, it is characterized in that: comprise analog digital controll block, LED load module, power control switching;
Described LED load module is: LED load and current source I
lEDbeing in series into a branch road, is LED load and current source I
lEDbranch road; Storage capacitor C
dwith above-mentioned LED load and current source I
lEDbranch road is in parallel and forms LED load module;
Analog digital controll block controls power control switching according to the output signal of LED load module;
Described analog digital controll block is made up of comparator and LOGIC module, and described LOGIC module is made up of operational amplifier and digital circuit;
Described power control switching is the diverter switch be made up of active switch and passive switch;
Described active switch is K switch;
Described passive switch is diode D;
Linear current source I
iNthe linear LED drive module without stroboscopic is driven through IN+ and IN-end;
Current source I
lEDend be connected with one of input of the comparator of the comparator of corresponding V1, corresponding V2, the comparator of corresponding V3 respectively; Another input of the comparator of the comparator of above-mentioned corresponding V1, the comparator of corresponding V2, corresponding V3 is connected with the reference level of V1, V2, V3 respectively;
The output of the comparator of corresponding V1, the comparator of corresponding V2, the comparator of corresponding V3 is the input of LOGIC module; The input of this LOGIC module is also CONT input simultaneously;
K switch is controlled by LOGIC module; The two ends of K switch are respectively linear current source I
iNiN+ end and IN-hold;
Diode D is in parallel with the two ends of K switch with the branch road formed after LED load block coupled in series;
OUT1 and OUT2 is respectively the output of LOGIC module.
2. according to claim 1 without the linear LED drive module of stroboscopic, it is characterized in that:
The output OUT1 of LOGIC module controls current source I
lEDsize.
3. according to claim 1 and 2 without the linear LED drive module of stroboscopic, it is characterized in that:
The described linear LED drive module without stroboscopic also comprises resistance Rs and corresponding two LOGIC module inputs; Hold series resistance Rs at the IN-of the linear LED drive module without stroboscopic, two inputs of above-mentioned LOGIC module are connected with the two ends of resistance Rs respectively.
4. utilize the linear LED drive system of the alternating current-direct current without stroboscopic be prepared from without the linear LED drive module of stroboscopic as claimed in claim 3, it is characterized in that:
At least 2 without after the series connection of stroboscopic linear LED drive module, with one outside be attached with the linear current source I of communication function
iNcombination.
5. utilize the described method of work without the linear LED drive module realization of stroboscopic as arbitrary in claims 1 to 3, it is characterized in that:
When input CONT is low level " 0 ", the conducting of LOGIC module controls K switch; IN+ and IN-without the linear LED drive module of stroboscopic holds by K switch conducting short circuit in zero level, linear current source I
iNthis linear LED drive module without stroboscopic is not powered; Only by storage capacitor C
denergy storage LED load is powered;
When input CONT is high level " 1 ", IN+ and IN-without the linear LED drive module of stroboscopic holds not by LOGIC module input CONT control switch K conducting short circuit; Hold through IN+ and IN-of the linear LED drive module without stroboscopic, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply; As current source I
lEDon terminal voltage V
iLEDlower than V1, output OUT1 is that high level feeds back to linear current source I
iNto increase input current; As current source I
lEDon terminal voltage V
iLEDv2<V
iLED<V3, LOGIC module controls K switch is opened a way, and output OUT2 is low level, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply; IN+ and IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage; But as current source I
lEDon voltage V
iLEDbe greater than V3, the conducting of LOGIC module controls K switch, output OUT2 is high level, linear current source I
iNthrough K switch short circuit, IN+ and the IN-end without the linear LED drive module of stroboscopic presents zero level, storage capacitor C
dlED load is powered; Storage capacitor C
dvoltage starts to reduce until current source I
lEDon terminal voltage V
iLEDbe less than V2; As current source I
lEDon terminal voltage V
iLEDbe less than V2, LOGIC module controls K switch is opened a way, and output OUT2 is low level, linear current source I
iNby diode D to LED load and storage capacitor C
dstart power supply; Storage capacitor C
dvoltage starts to increase until current source I
lEDon terminal voltage V
iLEDbe greater than V3; During this period, IN+ and the IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage; The switching of K switch is used to control storage capacitor C
dvoltage changes in allowed limits, namely controls the size of its ripple voltage; Due to the switching of K switch, IN+ and the IN-end without the linear LED drive module of stroboscopic will present zero level or storage capacitor C
dvoltage; The output level signal OUT1 of module and OUT2 and input CONT is undertaken combining control by participating in other linear LED drive module without stroboscopic.
6. the method for work utilized without the linear LED drive module realization of stroboscopic according to claim 5, is characterized in that:
When input CONT is low level " 0 ", the conducting of LOGIC module controls K switch, the linear current source I of corresponding period demand and duty ratio
iNzero input current; This IN+ and IN-without the linear LED drive module of stroboscopic holds by K switch conducting short circuit in zero level, linear current source I
iNpowering to this linear LED drive module without stroboscopic is zero; Only by storage capacitor C
dlED load is powered;
When input CONT is high level " 1 ", the linear current source I of corresponding period demand and duty ratio
iNinput current, this IN+ and IN-without the linear LED drive module of stroboscopic holds not by LOGIC module input CONT control switch K conducting short circuit; Hold through IN+ and IN-of the linear LED drive module without stroboscopic, linear current source I
iNby diode D to LED load and storage capacitor C
dpower supply; IN+ and IN-end without the linear LED drive module of stroboscopic presents storage capacitor C
dvoltage; As current source I
lEDon voltage V
iLEDexport low reference level lower than V1, LOGIC module output OUT1 and regulate current source I
lEDvalue, thus make storage capacitor C
denough charging currents are had to carry out energy storage; As current source I
lEDon voltage V
iLEDbe be greater than V3, LOGIC module output OUT1 exports high with reference to level adjustment current source I
lEDvalue, to reduce storage capacitor C
denergy storage charging current;
In every duty cycle start time, the K switch that namely LOGIC module input CONT controls turns off the moment, current source I by being conducting to
lEDon terminal voltage V
iLEDcompare with V2 reference level; Its difference is used for regulating current source I through output variable OUT1
lEDvalue; As current source I
lEDon voltage V
iLED>V2, this shows storage capacitor C
dcharging current large, current source I be increased
lEDvalue reduces storage capacitor C
dcharging current, i.e. I
iN-I
lED; As current source I
lEDon terminal voltage V
iLED<V2, this shows storage capacitor C
dcharging current little, current source I be reduced
lEDvalue increases storage capacitor C
dcharging current, i.e. I
iN-I
lED.
7. the method for work utilized without the linear LED drive module realization of stroboscopic according to claim 6, is characterized in that:
Resistance R
sremove Gather and input linear current source I
iNcurrent value and through this linear current source I
iNthe digital controlled signal of transmission; Due to resistance R
svoltage drop give input queued switches current value, this is conducive to LOGIC module and produces suitable output controlled quentity controlled variable OUT1 and control current source I
lED; Linear current source I in addition
iNthe digital controlled signal of transmission is at resistance R
sthe corresponding digital signal voltage of upper generation is transferred to LOGIC module, and the Digital Signals K switch that LOGIC module inputs according to this is opened or turned off.
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| CN105848376B (en) * | 2015-01-14 | 2019-02-22 | 矽力杰股份有限公司 | For dynamically reducing method, driver, driving circuit and the illuminating circuit of LED current |
| CN108449825A (en) * | 2017-12-27 | 2018-08-24 | 苏州菲达旭微电子有限公司 | A kind of High Power Factor high pressure is without stroboscopic LED linear driving circuit |
| CN114286467B (en) * | 2022-01-25 | 2023-12-22 | 维沃移动通信有限公司 | Flash lamp circuit, control method, electronic device, and readable storage medium |
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| CN101640967B (en) * | 2008-07-30 | 2013-01-02 | 普诚科技股份有限公司 | Drive circuit, dimming circuit and dimming method for fluorescent lamp |
| JP4618381B2 (en) * | 2008-09-05 | 2011-01-26 | ソニー株式会社 | Flyback booster and strobe device using the same |
| AT508195B1 (en) * | 2009-04-30 | 2012-03-15 | Tridonic Gmbh & Co Kg | OPERATING CIRCUIT FOR LIGHT DIODES |
| EP2653011B1 (en) * | 2010-12-15 | 2020-03-18 | Signify Holding B.V. | Linear driver for reduced perceived light flicker |
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Effective date of registration: 20191023 Address after: 214500 No. 8 Building East 2, Zhenjiang Pinglu, Xieqiao, Jingjiang City, Taizhou City, Jiangsu Province Patentee after: Jiangsu Xinhao Air Conditioning Equipment Co., Ltd. Address before: 310012 Qixia garden, Guihua Road, two West Wen Road, Hangzhou, Zhejiang, Xihu District 13-1-102 Patentee before: Wei Qicui |