CN103957649B - LED driving methods and LED illumination circuit - Google Patents
LED driving methods and LED illumination circuit Download PDFInfo
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- CN103957649B CN103957649B CN201410211945.8A CN201410211945A CN103957649B CN 103957649 B CN103957649 B CN 103957649B CN 201410211945 A CN201410211945 A CN 201410211945A CN 103957649 B CN103957649 B CN 103957649B
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Abstract
The invention discloses a kind of LED driving methods and LED illumination circuit, and it is that civil power AC is converted into Rectified alternating current by rectifier bridge, and the voltage of Rectified alternating current is more than zero, maximum working voltage V specified less than or equal to Rectified alternating currentWR3~7 sections of LED loads are set on Rectified alternating current, each section of LED load is cascaded to form LED load series block group, in the voltage rise of Rectified alternating current, the hop count of LED load series connection increases step by step, when the voltage of Rectified alternating current declines, the hop count of LED load series connection reduces step by step, and the hop count of LED load series connection is the LED load hop count for being actually connected into Rectified alternating current.The present invention on the premise of meeting to power to LED chip, can to greatest extent reduce the complexity of driving power.
Description
Technical field
The present invention relates to a kind of LED driving methods and LED illumination circuit, belong to technical field of LED illumination.
Background technology
Application number 201310140124.5,201310140138.7,201310140150.8,201310140105.2,
201310140134.9, the Chinese patent applications such as 201310140106.7,201310140151.2,201310140136.8 disclose
Multiple ray machine module technical schemes that can be used in LED bulb that is general and exchanging.These technologies are foundation with LED bulb
Centered on Lighting Industry framework, make LED bulb (lighting source), light fixture, Lighting control turn into it is independent produce, the terminal of application
The basic concept of product is laid a good foundation.But above-mentioned patent not yet solves the problems, such as driving power built in ray machine module.
Single LEDs chip power supply usually requires direct current supply, and civil power be rated for exchanging AC220~240V or AC110~
127V, if powered using civil power as LED illumination, the general direct current higher using offer quality after Switching Power Supply step-down rectifier
Electricity is used as driving power.The problem of this driving power is present is that Switching Power Supply volume is big, power supply difficult arrangement, cost are high；For
Reduction cost and volume, also there is the linear power supply using small volume, but its driving chip is more with DIP dual-in-lines or SMD
Paster encapsulation pattern coordinates auxiliary element again, and its volume is still not enough to small to can be placed into bulb.Except power volume
Outside, another problem is that all to provide a constant electric current to LED chip as far as possible be design criteria to these power supplys, subjective increasing
The complexity for having added driving power to design.
The content of the invention
It is an object of the present invention to provide a kind of LED driving methods and LED illumination circuit.It is able to can meet to give
On the premise of LED chip is powered, the complexity of driving power is reduced to greatest extent.
Technical scheme：LED driving methods, are characterized in：Civil power AC is converted into pulsation directly by rectifier bridge
Stream electricity, the voltage of Rectified alternating current are more than zero, maximum working voltage V specified less than or equal to Rectified alternating currentWR, in Rectified alternating current
3~7 sections of LED loads of upper setting, each section of LED load is cascaded to form LED load series block group, in the electricity of Rectified alternating current
During pressure rise, the hop count of LED load series connection increases step by step, when the voltage of Rectified alternating current declines, the hop count of LED load series connection
Reduce step by step, the hop count of LED load series connection is the hop count for the LED load series connection for being actually connected into Rectified alternating current.Civil power AC passes through
Become Rectified alternating current, example after rectifier bridge：After the rectified bridge rectification of AC220V, 50Hz alternating current, voltage is half period (180
Degree) wavy curve, cycle pulsating dc voltage at 0 degree is zero, and at 90 degree, pulsating dc voltage reaches maximum VWRFor
Highest DC311V, during 180 degree, voltage is reduced to zero again, goes round and begins again.
In foregoing LED driving methods, the section of the LED load series connection is controlled by switch, the control section of switch
Point is the segmentation boundary of voltage, and the number of fragments of the voltage is corresponding with the hop count that LED load is connected.LED load can be divided into 3
~7 sections, segmentation is few, and circuit is simple, but curent change is larger, easily produces low-order harmonic in power network；Segmentation is more, then circuit structure
It is complicated.Typically 4~6 sections are taken to be preferred.
In foregoing LED driving methods, the control method of the hop count of the LED load series connection is：By every section of LED load
Negative pole direction connects the negative pole of Rectified alternating current by switching respectively, is then opened according to the voltage change of Rectified alternating current each
The break-make of pass is controlled, and realizes that LED load is connected using by the mode of a few sections of switch open circuits (so as to which LED load is also breaking)
Hop count change.
In foregoing LED driving methods, the pulsating direct current operating voltage V of Rectified alternating current is setWMore than VWmaxPeriod,
Control it is all switch off, stop to all LED loads power, realize the overvoltage and surge protection to LED；Set by outside
Put a given voltage VTTo adjust the maximum allowable pulsating dc voltage V of Rectified alternating currentWmaxSize, so as to realize to LED's
Luminosity adjusts.
In foregoing LED driving methods, described switch is in pulsating dc voltage ascent stage delay tm(such as tm=
0.1ms) millisecond acts；Shift to an earlier date t in the pulsating dc voltage decline stagem(such as tm=0.1ms) millisecond action；To obtain relatively
Stable LED operation electric current.
In foregoing LED driving methods, by setting current sensor to measure effective operating current I in circuitW, work as IWIt is super
Cross design load KIWRWhen, close all switches to realize current protection, switch on need to be reloaded in next time it is extensive after voltage
Multiple, wherein K is regulation coefficient, IWRFor specified effective operating current.
In foregoing LED driving methods, set 2 groups of bands to drive and worked together simultaneously with the complete circuit of LED load, its
In：1 group of LED load has higher colour temperature, as described given voltage VTWhen value tends to be low, described maximum allowable pulsation is straight
Flow voltage VWmaxTend to high level；And another 1 group of LED load has relatively low colour temperature, as described given voltage VTWhen value tends to be low,
Described maximum allowable pulsating dc voltage VWmaxTend to low value.The described given voltage V of regulationTLED illumination colour temperature can be achieved in value
Adjustment.
In foregoing LED driving methods, it is with different maximum carryings to set each section of LED load being cascaded
The LED chip group of magnitude of voltage；The LED load series block group that can make to work in the case where switch controls obtains the work close to ideal sine wave
Make current curve.
In foregoing LED driving methods, the adjustment of the maximum carrying voltage of the LED chip group of each section of LED load
Method is：(key is to calculate the total maximum carrying magnitude of voltage of series block group) is 1. using pulsating dc voltage as ordinate, arteries and veins
The dynamic direct current cycle (180 degree) maps for abscissa；2. assuming a pure resistor load, its power is formed in pulsating direct current half-wave
Sinusoidal graphics area is 1, mapping；3. because LED voltage increase electric current increases, substantially power damages.Set LED load string
The load power for joining section group is the 120% of pure resistor load, makees the rectangle echo that an area is 1.2, the vertical seat of rectangle shade
Scale value is the total maximum carrying magnitude of voltage of series block group；4. similarly, it is known that under LED chip group carrying voltage condition, can map
The graphics area of chipset is drawn, the area sum of piecewise proofing chip group is more than the pulsating direct current under the control node of switch just
Accumulate on string corrugated；5. choosing the carrying magnitude of voltage of chipset in series block group by commodity, it is added that to be more than or equal to series block group total
Maximum carrying magnitude of voltage；Wherein, the higher LED chip group of magnitude of voltage is carried close to positive terminal (beginning section), carries magnitude of voltage
Relatively low LED chip group is close to negative pole end (latter end).
The LED illumination circuit of preceding method is realized, is characterized in：Include the rectifier bridge of input connection civil power, rectifier bridge
Output end positive pole be connected to 3~7 sections of concatenations LED load positive pole, the negative pole of every section of LED load is respectively connected to drive
In the connecting node of dynamic power supply chip, the negative pole of the output end of rectifier bridge is connected to the earth terminal of driving power chip, the drive
The operating voltage test side for the front end for being connected to all LED loads, the driving power chip are additionally provided with dynamic power supply chip
On be additionally provided with maximum allowable pulsating dc voltage adjustable side.
In foregoing LED illumination circuit, the driving power chip includes voltage detecting and logic switch controller, voltage
Detection and logic switch controller are provided with operating voltage test side and maximum allowable pulsating dc voltage adjustable side；Also include connecting
Node is connect, each connecting node is respectively connected to earth terminal by switching tube, and the control terminal of each switching tube is both connected to
In voltage detecting and logic switch controller.
In foregoing LED illumination circuit, each connecting node is respectively connected to same by switching tube and merged
On connecting line, then by merging connecting line it is connected to earth terminal, merges connecting line and be provided with current detection circuit, current detecting is electric
The output end on road is connected on voltage detecting and logic switch controller.
Compared with prior art, civil power is converted into Rectified alternating current by the present invention by rectifier bridge, while by each cycle
Interior voltage is multistage by phase division, and using the different characteristic of voltage in multistage, using switch to concatenating into working condition
The hop count of LED load be adjusted so that LED load enters controlization, one very close pulsating direct current power of acquisition
The operational mode of characteristic, the operational mode can meet that LED chip is powered, and this LED type of drive of the present invention can be with
Greatly reduce the complexity of LED drive power so that driving power built in LED light machine module is possibly realized, this for
LED bulb realizes that bigger versatility and interchangeability are significant.
Brief description of the drawings
Fig. 1 is the LED voltage current waveform figure of the embodiment of the present invention；
Fig. 2 is that the extra-high voltage of the embodiment of the present invention runs power waveform figure；
The light modulation operation power waveform figure of Fig. 3 embodiment of the present invention；
The circuit connection diagram of Fig. 4 embodiment of the present invention；
The driving power chip internal circuits figure of Fig. 5 embodiment of the present invention；
The LED voltage current waveform figure of Fig. 6 embodiment of the present invention；
Fig. 7：The LED chip array module power loading distribution map of DC52V of embodiment of the present invention series connection；
Fig. 8：LED chip array of the embodiment of the present invention carries voltage tentative calculation figure；
Fig. 9：Single DC52V chip bearing power tentative calculation figure of the embodiment of the present invention；
Figure 10：The LED chip array module power loading distribution map of 2*52V+4*35V of embodiment of the present invention series connection.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
Embodiment.LED driving methods：Civil power AC is converted into Rectified alternating current, the voltage of Rectified alternating current by rectifier bridge
More than zero, maximum working voltage V specified less than or equal to Rectified alternating currentWR, 3~7 sections of LED loads are set on Rectified alternating current,
Series system is formed between each section of LED load, in the voltage rise of Rectified alternating current, the hop count of LED load series connection increases step by step,
When the voltage of Rectified alternating current declines, the hop count of LED load series connection reduces step by step, and the hop count of LED load series connection is actually to connect
Enter the LED load hop count of Rectified alternating current.The section of the LED load series connection is controlled by switch, the control node of switch
It is corresponding with the hop count of LED load for the segmentation boundary of voltage, the number of fragments of the voltage.By the negative pole of every section of LED load
Direction connects the negative pole of Rectified alternating current by switching respectively, then according to the voltage change of Rectified alternating current to each switch
Break-make is controlled, and uses the change for the hop count that the mode of a few sections of LED load open circuits is realized to LED load series connection.Set whole
The pulsating direct current operating voltage V of Rectified alternating currentWMore than VWmaxPeriod, control it is all switches off, stop bearing to all LED
Power supply is carried, a given voltage V is then set by outsideTTo adjust the maximum allowable pulsating dc voltage V of Rectified alternating currentWmax
Size, so as to realize the light modulation to LED；And LED voltage protection can be realized in a like fashion.Described switch exists
Pulsating dc voltage ascent stage delay tm(such as tm=0.1ms) millisecond action；Shift to an earlier date t in the pulsating dc voltage decline stagem
(such as tm=0.1ms) millisecond action；To obtain relatively stable LED operation electric current.By setting current sensor to measure electricity
Effective operating current I in roadW, work as IWMore than design load KIWRWhen, all switches are closed to realize current protection, are switched on
Recover after voltage need to being reloaded in next time, wherein K is regulation coefficient, IWRFor specified effective operating current；2 groups of band drivings are set
Worked together simultaneously with the complete circuit of LED load, wherein：1 group of LED load has higher colour temperature, when described given electricity
Press VTWhen value tends to be low, described maximum allowable pulsating dc voltage VWmaxTend to high level；And another 1 group of LED load have it is relatively low
Colour temperature, as described given voltage VTWhen value tends to be low, described maximum allowable pulsating dc voltage VWmaxTend to low value.Regulation
Described given voltage VTThe adjustment of LED illumination colour temperature can be achieved in value；Set each section of LED load being cascaded be with
The LED chip group of different maximum carrying magnitudes of voltage；Wherein, working condition is just entered when the hop count of LED load series connection is higher
LED load be arranged to have the LED chip group of relatively low maximum carrying magnitude of voltage, so as to solve LED chip utilization
The shortcomings that rate is low.Adjustment side's key of the maximum carrying voltage of each section of LED load is to calculate series block group always most
Big carrying magnitude of voltage：1. it is abscissa mapping by ordinate, pulsating direct current cycle (180 degree) of pulsating dc voltage；2. due to
LED voltage increase electric current increases, and substantially power damages.It is assumed that a pure resistor load, its power is in pulsating direct current half-wave
The sinusoidal graphics area of formation is 1, is mapped (referring to Fig. 8)；3. the load power for setting LED load series block group is born as pure resistance
120% carried, make the rectangle echo that an area is 1.2, the ordinate value of rectangle shade is that the total maximum of series block group is held
Carry magnitude of voltage；4. similarly, it is known that under LED chip group carrying voltage condition, it can map and draw the graphics area of chipset, (referring to
Fig. 9), the area sum of piecewise proofing chip group is more than the pulsating direct current sine wave area under the control node of switch；5. press business
To choose the carrying magnitude of voltage of chipset in series block group, be added the maximum carrying magnitude of voltage total more than or equal to series block group is product
Can；Wherein, the higher LED chip group of magnitude of voltage is carried to lean on close to positive terminal (beginning section), the relatively low LED chip group of carrying magnitude of voltage
Nearly negative pole end (latter end).
Realize the LED illumination circuit of front method：Include the rectifier bridge B of input connection civil power1, rectifier bridge B1Output end
Positive pole be connected to multistage concatenation LED load positive pole, the negative pole of every section of LED load is respectively connected to driving power chip
U1Connecting node J1、J2…JnOn, rectifier bridge B1The negative pole of output end be connected to driving power chip U1Earth terminal GND,
The driving power chip U1On be additionally provided with the operating voltage test side V of the front end for being connected to all LED loadsW, the driving
Power supply chip U1On be additionally provided with maximum allowable pulsating dc voltage adjustable side VWmax.The driving power chip U1Examined including voltage
Survey and logic switch controller U2, voltage detecting and logic switch controller U2It is provided with operating voltage test side VWPermit with maximum
Perhaps pulsating dc voltage adjustable side VWmax；Also include connecting node J1、J2…Jn, each connecting node J1、J2…JnRespectively lead to
Cross switching tube K1、K2…KnIt is connected to earth terminal GND, and each switching tube K1、K2…KnControl terminal be both connected to voltage detecting
And logic switch controller U2On.Each connecting node J1、J2…JnRespectively pass through switching tube K1、K2…KnIt is connected to same
One merges on connecting line, then is connected to earth terminal GND by merging connecting line, merges connecting line and is provided with current detecting electricity
Road, the output end of current detection circuit are connected to voltage detecting and logic switch controller U2On.
It is hereafter the operation principle of the invention by taking 6 groups of LED loads as an example.I.e. n values are 6.
First, alternating current AC becomes Rectified alternating current, example after rectifier bridge：The rectified bridge of AC220V, 50Hz alternating current
After rectification, referring to Fig. 1, voltage is the wavy curve of half period (180 degree), and cycle pulsating dc voltage at 0 degree is zero,
Pulsating dc voltage reaches maximum V at 90 degreeWRFor highest DC311V, during 180 degree, voltage is reduced to zero again, goes round and begins again.
It is more than zero with being less than or equal to V in pulsating dc voltageWRBetween, 6 sections of loads are set altogether, series connection is formed between each section of load
Mode, raised with voltage, load (i.e. LED load) series connection hop count increases step by step, and load voltage is by switch controlled loading, referring to figure
1 and Fig. 4, voltage switch node are that voltage is segmented boundary.
Power supply management operational mode：Design current control device, the keying of switches at different levels are not only dependent upon V to the present inventionW's
Change, referring to Fig. 1, Fig. 4 and Fig. 5.
During 0~90 degree of cycle：
1st section：Work original state, i.e. the cycle switchs K from 0 starting, circuit1~K6In opening (ON), electric current
Mainly through node J1By switching K1Path is formed, it is 1V to load by rated voltageWRThe LED compositions of/6 tandem workings；
2nd section：Work as VWMore than or equal to 1VWRWhen/6, switch K1 closes (OFF), and electric current is mainly through node J2 by switching K2
Path is formed, it is 2V to load by rated voltageWRThe LED compositions of/6 tandem workings；
3rd section：Work as VWMore than or equal to 2VWRWhen/6, switch K1 is in OFF, and switch K2 closes (OFF), the main warp knuckle of electric current
Point J3 forms path by switching K3, and it is 3V to load by rated voltageWRThe LED compositions of/6 tandem workings；
4th section：Work as VWMore than or equal to 3VWRWhen/6, switch K1~K2 is in OFF, and switch K3 closes (OFF), and electric current is main
Path is formed by switching K4 through node J4, it is 4V to load by rated voltageWRThe LED compositions of/6 tandem workings；
5th section：Work as VWMore than or equal to 4VWRWhen/6, switch K1~K3 is in OFF, and switch K4 closes (OFF), and electric current is main
Path is formed by switching K5 through node J5, it is 5V to load by rated voltageWRThe LED compositions of/6 tandem workings；
6th section：Work as VWMore than or equal to 5VWRWhen/6, switch K1~K4 is in OFF, and switch K5 closes (OFF), electric current warp knuckle
Point J6 forms path by switching K6, and it is 6V to load by rated voltageWRThe LED compositions of/6 tandem workings；
When switching K1~K6 closings, delay 0.1ms method for closing can be used, relatively stable electric current can be obtained.
During 90~180 degree of cycle：
6th section：Worked original state, and voltage is reduced downwards by maximum, and K1~K5 is switched in circuit and is closed
(OFF), switch K6 is in opening, and electric current forms path through node J6 by switching K6, and it is 6V to load by rated voltageWR/6
The LED compositions of tandem working；
5th section：Work as VWLess than or equal to 5VWRWhen/6, switch K5~K6 opens (ON), and electric current mainly passes through switch through node J5
K5 forms path, and it is 5V to load by rated voltageWRThe LED compositions of/6 tandem workings；
4th section：Work as VWLess than or equal to 4VWRWhen/6, switch K4~K6 opens (ON), and electric current mainly passes through switch through node J4
K4 forms path, and it is 4V to load by rated voltageWRThe LED compositions of/6 tandem workings；
3rd section：Work as VWLess than or equal to 3VWRWhen/6, switch K3~K6 opens (ON), and electric current mainly passes through switch through node J3
K3 forms path, and it is 3V to load by rated voltageWRThe LED compositions of/6 tandem workings；
2nd section：Work as VWLess than or equal to 2VWRWhen/6, switch K2~K6 opens (ON), and electric current mainly passes through switch through node J2
K2 forms path, and it is 2V to load by rated voltageWRThe LED compositions of/6 tandem workings；
1st section：Work as VWLess than or equal to 1VWRWhen/6, switch K1~K6 opens (ON), and electric current mainly passes through switch through node J1
K1 forms path, and it is 1V to load by rated voltageWRThe LED compositions of/6 tandem workings.
When switching K1~K6 unlatchings, the open method of 0.1ms in advance can be used, relatively stable electric current can be obtained.
Dim operational mode：Outside sets a given voltage VTWhen=0, VWmaxCorresponding CVWR, external voltage gives VT=5V
When, VWmaxCorresponding 0V, sets 0≤VWmax≤CVWR, C regulation coefficients, for the multiple of rated voltage, such as C=1.12.VWMore than VWmax
Period, corresponding each section of switch will close (OFF), and stop powering to the load.It act as a kind of dimming arrangement.Referring to Fig. 3,
Fig. 4 and Fig. 5, adjust VWmaxLess than VWR, dash area will increase in figure, be input to the power of load and will reduce, be adjusted so as to reach
The purpose of light.Example：When LED is in AC220V civil power normal works, during the voltage of adjustment alternating current voltage to AC180V, in figure
Dash area is VWFormation power projection figure part higher than 254V, from about 55.5 degree to 124.5 degree of cycle, due to this section
Switch Kx is in and closes (OFF) accordingly in time, and the power consumption of dash area is (equivalent to pulsating direct current half-wave under normal civil power
57.0%) loading power will be removed, this part power consumption is not loaded into load, makes the luminance-reduction of load.Work as VWmax
During equal to 0, all switches will close (OFF), and load supplying amount is zero.Stepless dimming can be accomplished, disappeared without energy occurs
Consumption.
Voltage protection operational mode：V is setWmax=CVWR。VWMore than VWmaxPeriod, corresponding each section of switch will close
(OFF), stop powering to the load.Referring to Fig. 2, Fig. 4 and Fig. 5, example：When civil power reaches 270V high voltage, the shade in figure
Part is VWFormation power echo part higher than 348V, from about 66 degree to 114 degree of cycle, due to K1 in this time
~K6 switches are in (OFF) is closed, and the power consumption of dash area is (equivalent to the loading power of pulsating direct current half-wave under normal civil power
50.2%) will be removed, this part power consumption is not loaded into load, load is not burnt because of overvoltage；Power network gushes
When unrestrained, it may occur that instantaneous peak voltage is much higher than VWmax, this moment each section of switch be closed, realize and gush
The purpose of wave protection.
Overcurrent protection operational mode：The present invention has overcurrent protection, and referring to Fig. 5, current sensor is measured in circuit effectively
Operating current IWMore than design load KIWR, K is regulation coefficient, example：Set IWR=275mA, K=1.2, logic switch controller will
All switch K1~K6 (OFF) are closed, opens after switch (ON) K1~K6 need to reload power supply pressure in next time and recovers.
Colour temperature adjusts operational mode：The complete circuit of 2 groups of band drivings and LED load is set while worked together, wherein：1
Group LED load has higher colour temperature, as the given voltage V that outside is setTWhen=0, maximum allowable pulsating dc voltage VWmax=
CVWR, given voltage VTWhen=5, maximum allowable pulsating dc voltage VWmax=0；And another 1 group of LED load has relatively low colour temperature,
As the given voltage V that outside is setTWhen=0, maximum allowable pulsating dc voltage VWmax=0, given voltage VTWhen=5, maximum permits
Perhaps pulsating dc voltage VWmax=CVWR.The outside given voltage V set of regulationTThe adjustment of LED illumination colour temperature, color can be achieved in value
The principle of temperature regulation approaches with dimming operational mode, reference can be made to Fig. 5, but under this pattern can only color-temperature regulating can not adjust brightness.
According to principle same as described above, mode of loading can be divided into 3~7 sections, and segmentation is few, and circuit is simple, but curent change
It is larger, low-order harmonic is easily produced in power network, referring to Fig. 6；Segmentation is more, then circuit structure is complicated.Typically 4~6 sections are taken to be preferred.
Note：VW- pulsating direct current operating voltage (1.4142* alternating voltages)；VWRThe specified maximum working voltage of-pulsating direct current
(1.4142* alternating voltages)；VWmax- maximum allowable pulsating dc voltage (1.4142* alternating voltages)；IW- effectively work is electric
Stream.IWR- specified effective operating current.
If civil power is AC220, the voltage after rectification is DC311V, so that every group of LED load is single chip as an example, then every
Chip bears DC52V；Such as AC110, then chip bears DC26V.If the loading power area of pulsating direct current half-wave is 1, referring to figure
7, each LED load (LED module 1 to 6) is loaded that power difference is bigger in figure, and LED module 1 reaches pulsating direct current half-wave
Load 20.68% (for the 84.4% of chip nominal output) of power area；And LED module 6 only 5.11% is (specified for chip
Contribute 19.2%), the about a quarter power of module 1 verifies that the intrinsic brilliance of module 6 is very low by actual measurement；Whole core
The power being loaded that is averaged of piece group is the 52.4% of chip nominal output, and the utilization rate of chip is relatively low；And chipset is specified
Output (dotted line frame area) is the 159% of the loading power area of pulsating direct current half-wave.Because chip redundancy amount is excessive, not only core
Piece wastes, and also results in that driving power is excessive and wastes, while adds the difficulty on arranging.Therefore, selected under Constant Direct Current state
Some problems under pulsating direct current state be present in the method for selecting chip voltage, how on the premise of chip secure work is ensured,
Improve chip utilization rate turn into one it is to be solved the problem of.
The nominal output of the LED chip array of 6 series connection of setting is turned down by 1.59 times of pulsating direct current half-wave loading power
To 1.2 times, (because LED voltage increase electric current increases, substantially power damages.1.2 times of power headroom are set to ensure LED enough
It is not burned out), referring to Fig. 8, if LED chip array chip bearing power (rectangle hatched area in figure) is pulsating direct current half
When ripple loads 1.2 times of power (pulsating direct current half-wave part area), it can be mapped by Fig. 8 and extrapolate core when civil power is AC220V
The carrying voltage of chip arrays is DC236V；
Referring to Fig. 9, different magnitudes of voltage is set respectively to module 6 to LED module 1, different bearer magnitude of voltage can be obtained
Under chip loading power area (dash area in figure)；
Using 2*52V+4*35V high voltages chip, (the model VES-AADBHV45 of module 1 and module 2, module 3 arrive mould
Group 6 is ES-AADBHF40) form serial array, then the carrying voltage of chip array is adjusted to DC244V；Make Figure 10, acquisition
Chip array is loaded 96.67% that power area is pulsating direct current half-wave power area, and the power that chip array is loaded connects
Nearly 1 is perfect condition；The power that now LED chip array is loaded is chip array nominal output 77.6%；Experimental verification with
Estimated value is close.
The module loading power checking of each voltage section：If the loading power area of pulsating direct current half-wave is 1, voltage is sat to be vertical
Timestamp, it is 26.52% to calculate DC52V chips nominal output easily by Fig. 9, and similarly, the nominal output of DC35V chips is
17.89%；Figure 10 is then civil power when being AC220V, the power situation being loaded of each module of LED chip array；Table 1 is chip
When the power that array is loaded is pulsating direct current half-wave power area 1, line voltage is respectively AC220V, AV246V, AC270V
Each module is loaded the situation of power, and only module 3 is can be seen that in table and is slightly overloaded in DC311V and DC348V, but due to
Module 1 and module 2 have margin of power, and experiment proves that module 3 can pass through.
In other line voltage grades, optimal way is with reference to above-mentioned progress.
Ideally the checking computations of chip bearing power are as shown in the table：
Claims (8)
1.LED driving methods, it is characterised in that：Civil power AC is converted into Rectified alternating current by rectifier bridge, Rectified alternating current
Voltage is more than zero, maximum working voltage V specified less than or equal to Rectified alternating currentWR, set 3~7 sections of LED to bear on Rectified alternating current
Carrying, each section of LED load is cascaded to form LED load series block group, in the voltage rise of Rectified alternating current, LED load
The hop count of series connection increases step by step, and when the voltage of Rectified alternating current declines, the hop count of LED load series connection reduces step by step, LED load
The hop count of series connection is the LED load hop count for being actually connected into Rectified alternating current；It is tool to set each section of LED load being cascaded
There is the LED chip group of different maximum carrying magnitudes of voltage, the LED load series block group that can make to work in the case where switch controls is connect
The operating current curve of nearly ideal sine wave；Set the pulsating direct current operating voltage V of Rectified alternating currentWMore than VWmaxPeriod, control
Make it is all switch off, stop to all LED loads power, realize the overvoltage and surge protection to LED；Set by outside
One given voltage VTTo adjust the maximum allowable pulsating dc voltage V of Rectified alternating currentWmaxSize, so as to realize the hair to LED
Brightness adjusts；The method of adjustment of the maximum carrying voltage of each section of LED load is：1. sat using pulsating dc voltage to be vertical
Mark, pulsating direct current cycle map for abscissa；2. assuming a pure resistor load, its power is formed just in pulsating direct current half-wave
String graphics area is 1, mapping；3. setting the load power of LED load series block group as the 120% of pure resistor load, make one side
Product is 1.2 rectangle echo, and the ordinate value of rectangle shade is the total maximum carrying magnitude of voltage of series block group；4. similarly,
Under known LED load carrying voltage condition, can map and draw the graphics area of LED load, verify paragraph by paragraph LED load area it
With more than the pulsating direct current sine wave area under the control node of switch；5. choose each section of LED load in LED load series block group
Carrying magnitude of voltage, be added and be more than or equal to the total maximum carrying magnitude of voltage of series block group；Wherein, it is higher to carry magnitude of voltage
LED load is close to positive terminal, and the relatively low LED load of carrying magnitude of voltage is close to negative pole end.
2. LED driving methods according to claim 1, it is characterised in that：The hop count of the LED load series connection passes through switch
It is controlled, the control node of switch is the segmentation boundary of voltage, the hop count that the number of fragments of the voltage is connected with LED load
It is corresponding；The control method of the hop count of the LED load series connection is that the negative pole direction of every section of LED load is passed through into switch respectively
The negative pole of Rectified alternating current is connected, then each switch on-off is controlled according to the voltage change of Rectified alternating current, made
With the change for the hop count that the mode of a few sections of switch open circuits is realized to LED load series connection.
3. LED driving methods according to claim 2, it is characterised in that：Described switch rises in pulsating dc voltage
Stage delay tmMillisecond action；Shift to an earlier date t in the pulsating dc voltage decline stagemMillisecond action；To obtain relatively stable LED
Operating current.
4. LED driving methods according to claim 2, it is characterised in that：By setting current sensor to measure in circuit
Effective operating current IW, work as IWMore than design load KIWRWhen, all switches are closed to realize current protection, and switching on need to be
Recover after reloading voltage next time, wherein K is regulation coefficient, IWRFor specified effective operating current.
5. LED driving methods according to claim 2, it is characterised in that：2 groups of bands are set to drive complete with LED load
Circuit works together simultaneously, wherein：1 group of LED load has higher colour temperature, as described given voltage VTWhen value tends to be low,
Described maximum allowable pulsating dc voltage VWmaxTend to high level；And another 1 group of LED load has relatively low colour temperature, when described
Given voltage VTWhen value tends to be low, described maximum allowable pulsating dc voltage VWmaxTend to low value；The described given voltage of regulation
VTThe adjustment of LED illumination colour temperature can be achieved in value.
6. realize the LED illumination circuit of claim 1 to 5 any claim methods described, it is characterised in that：Including input
Connect the rectifier bridge (B of civil power1), rectifier bridge (B1) output end positive pole be connected to 3~7 sections concatenation LED load positive pole,
The negative pole of every section of LED load is respectively connected to driving power chip (U1) connecting node (J1、J2…Jn) on, rectifier bridge (B1)
The negative pole of output end be connected to driving power chip (U1) earth terminal (GND), the driving power chip (U1) on be additionally provided with
It is connected to the operating voltage test side (V of the front end of all LED loadsW), the driving power chip (U1) on be additionally provided with maximum
Allow pulsating dc voltage adjustable side (VWmax)。
7. LED illumination circuit according to claim 6, it is characterised in that：Driving power chip (the U1) include voltage inspection
Survey and logic switch controller (U2), voltage detecting and logic switch controller (U2) it is provided with operating voltage test side (VW) and
Maximum allowable pulsating dc voltage adjustable side (VWmax)；Also include connecting node (J1、J2…Jn), each connecting node (J1、J2…
Jn) respectively pass through switching tube (K1、K2…Kn) it is connected to earth terminal (GND), and each switching tube (K1、K2…Kn) control terminal
It is both connected to voltage detecting and logic switch controller (U2) on.
8. LED illumination circuit according to claim 7, it is characterised in that：Each connecting node (J1、J2…Jn)
Pass through switching tube (K respectively1、K2…Kn) be connected on same merging connecting line, then it is connected to earth terminal by merging connecting line
(GND), merge connecting line and be provided with current detection circuit, the output end of current detection circuit is connected to voltage detecting and logic is opened
Gateway controller (U2) on.
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| CN201410211945.8A CN103957649B (en) | 2014-05-20 | 2014-05-20 | LED driving methods and LED illumination circuit |
| PCT/CN2015/079152 WO2015176626A1 (en) | 2014-05-20 | 2015-05-18 | Led large chip and optical machine module group |
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| CN201410211945.8A CN103957649B (en) | 2014-05-20 | 2014-05-20 | LED driving methods and LED illumination circuit |
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| WO2015176626A1 (en) * | 2014-05-20 | 2015-11-26 | 贵州光浦森光电有限公司 | Led large chip and optical machine module group |
| CN106797691B (en) * | 2014-09-26 | 2019-07-19 | 夏普株式会社 | Lighting device |
| CN104791627B (en) * | 2015-04-21 | 2018-10-12 | 贵州光浦森光电有限公司 | A kind of construction method and LED filament lamp of LED filament lamp |
| CN105142270A (en) * | 2015-08-14 | 2015-12-09 | 四川华泰电气有限公司 | Alternating-current light-emitting diode (LED) lamp |
| CN105627125A (en) * | 2016-03-11 | 2016-06-01 | 贵州光浦森光电有限公司 | Large-chip LED lamp filament and large-chip LED lamp filament bulb |
| CN105627130B (en) * | 2016-03-11 | 2019-05-03 | 贵州光浦森光电有限公司 | A kind of LED filament light bulb with heat radiation bracket |
| CN105605449A (en) * | 2016-03-11 | 2016-05-25 | 贵州光浦森光电有限公司 | Blocky large-chip LED lamp filament assembly and blocky large-chip LED lamp filament bulb |
| CN105627124B (en) * | 2016-03-11 | 2019-07-30 | 贵州光浦森光电有限公司 | A kind of LED filament component, the method and LED filament light bulb for setting up LED filament light bulb |
| CN105627131B (en) * | 2016-03-11 | 2019-05-03 | 贵州光浦森光电有限公司 | A kind of LED filament light bulb of band cylinder heat slinger |
| CN207196205U (en) * | 2017-08-31 | 2018-04-06 | 广州怡泰照明电子科技有限公司 | One kind exchange driving fin type heat radiating LED lamp |
| TWI674036B (en) * | 2018-12-13 | 2019-10-01 | 群光電能科技股份有限公司 | Lighting system |
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| US7081722B1 (en) * | 2005-02-04 | 2006-07-25 | Kimlong Huynh | Light emitting diode multiphase driver circuit and method |
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| CN203225926U (en) * | 2013-04-12 | 2013-10-02 | 广州怡泰照明电子科技有限公司 | LED lamp having self-adaptive drive circuit and self-adaptive drive circuit |
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