CN103957649A - LED driving method and LED lighting circuit - Google Patents
LED driving method and LED lighting circuit Download PDFInfo
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- CN103957649A CN103957649A CN201410211945.8A CN201410211945A CN103957649A CN 103957649 A CN103957649 A CN 103957649A CN 201410211945 A CN201410211945 A CN 201410211945A CN 103957649 A CN103957649 A CN 103957649A
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Abstract
The invention discloses an LED driving method and an LED lighting circuit. According to the LED driving method and the LED lighting circuit, a mains supply AC is converted into a pulsating direct current through a rectifier bridge, voltage of the pulsating direct current is larger than zero and smaller than or equal to the rated maximum working voltage VWR of the pulsating direct current, 3-7 sections of LED loads are arranged on the pulsating direct current, the LED loads are in series connection to form an LED load series connection section group, the section number of the LED loads in series connection is increased step by step when the voltage of the pulsating direct current rises, the section number of the LED loads in series connection is decreased step by step when the voltage of the pulsating direct current descends, and the section number of the LED loads in series connection is the section number of the LED loads actually connected to the pulsating direct current. According to the LED driving method and the LED lighting circuit, on the premise that power supply to an LED chip can be met, the complexity of a driving power supply is reduced to the largest extent.
Description
Technical field
The present invention relates to a kind of LED driving method and LED lighting circuit, belong to LED lighting technical field.
Background technology
The Chinese patent application such as application number 201310140124.5,201310140138.7,201310140150.8,201310140105.2,201310140134.9,201310140106.7,201310140151.2,201310140136.8 disclose a plurality of ray machine module technical schemes that can use on LED bulb general and that exchange.These technology are for setting up the Lighting Industry framework centered by LED bulb, and the basic concept that makes LED bulb (lighting source), light fixture, illumination control the end product that becomes independent production, application is laid a good foundation.But above-mentioned patent not yet solves the problem of the built-in driving power of ray machine module.
Single LEDs chip power supply needs direct current supply conventionally, and civil power is rated for interchange AC220～240V or AC110～127V, if using civil power during as LED illuminalive power-supply, generally adopt and provide after Switching Power Supply step-down rectifier direct current that quality is higher as driving power.The problem that this driving power exists is that Switching Power Supply volume is large, power supply difficult arrangement, cost are high; In order to reduce cost and volume, also have the linear power supply that adopts small volume, but it drives chip to coordinate auxiliary element mainly with DIP dual-in-line or SMD paster encapsulation pattern again, its volume is still not enough to little of being placed into bulb inside.Except power volume, another problem be these power supplys all to LED chip, to provide a constant electric current be as far as possible design criterion, the subjective complexity that has increased driving power design.
Summary of the invention
The object of the invention is to, a kind of LED driving method and LED lighting circuit are provided.It can, under the prerequisite meeting to LED chip power supply, reduce the complexity of driving power to greatest extent.
Technical scheme of the present invention: LED driving method, is characterized in: civil power AC is converted into Rectified alternating current by rectifier bridge, and the voltage of Rectified alternating current is greater than zero, is less than or equal to the specified maximum working voltage V of Rectified alternating current
wR3～7 sections of LED loads are set on Rectified alternating current, each section of LED load is cascaded and forms LED load series block group, when the voltage of Rectified alternating current raises, the hop count of LED load series connection increases step by step, when the voltage drop of Rectified alternating current, the hop count of LED load series connection reduces step by step, and the hop count of LED load series connection is the actual hop count that is connected into the LED load series connection of Rectified alternating current.Civil power AC becomes Rectified alternating current after rectifier bridge, example: AC220V, 50Hz alternating current is after rectifier bridge rectification, and voltage is the wavy curve of half period (180 degree), cycle pulsating dc voltage when 0 spends is zero, and when 90 spend, pulsating dc voltage reaches maximum V
wRfor the highest DC311V, 180 when spend, and voltage reduces to again zero, goes round and begins again.
In aforesaid LED driving method, the section of described LED load series connection is controlled by switch, the segmentation boundary that the control node of switch is voltage, and the number of fragments of described voltage is corresponding with the hop count of LED load series connection.LED load can be divided into 3～7 sections, and segmentation is few, and circuit is simple, but curent change is larger, easily at electrical network, produces low-order harmonic; Segmentation is many, and circuit structure is complicated.Generally get 4～6 sections for good.
In aforesaid LED driving method, the control method of the hop count of described LED load series connection is: the negative pole direction of every section of LED load is connected respectively to the negative pole of Rectified alternating current by switch, then according to the change in voltage of Rectified alternating current, the break-make of each switch is controlled, used the mode of a few sections of switches are opened circuit (thereby LED load is also opened circuit) to realize the change of the hop count of LED load series connection.
In aforesaid LED driving method, set the pulsating direct current operating voltage V of Rectified alternating current
wbe greater than V
wmaxperiod, control all switches and disconnect, stop to all LED load supplyings, realize the overvoltage of LED and surge protection; By the given voltage V of outer setting one
tthe maximum of adjusting Rectified alternating current allows pulsating dc voltage V
wmaxsize, thereby realize the luminosity adjustment to LED.
In aforesaid LED driving method, described switch is at pulsating dc voltage ascent stage time delay t
m(as t
m=0.1ms) millisecond action; In the pulsating dc voltage decline stage, shift to an earlier date t
m(as t
m=0.1ms) millisecond action; To obtain LED operating current relatively stably.
In aforesaid LED driving method, by being set, current sensor records effective operating current I in circuit
w, work as I
wsurpass design load KI
wRtime, close all switches to realize current protection, the unlatching of switch need recover after reloading voltage next time, and wherein K is for adjusting coefficient, I
wRfor specified effective operating current.
In aforesaid LED driving method, the complete circuit that 2 groups of bands drivings and LED load are set was worked together with the while, wherein: 1 group of LED load has higher colour temperature, and as described given voltage V
twhen value is tending towards low, described maximum allows pulsating dc voltage V
wmaxbe tending towards high value; And another 1 group of LED load has lower colour temperature, as described given voltage V
twhen value is tending towards low, described maximum allows pulsating dc voltage V
wmaxbe tending towards low value.Regulate described given voltage V
tvalue can realize the adjustment of LED illumination colour temperature.
In aforesaid LED driving method, it is the LED chip group with different maximum carrying magnitudes of voltage that each section of LED load being cascaded is set; Can make the LED load series block group of working under switch is controlled obtain the operating current curve that approaches ideal sine wave.
In aforesaid LED driving method, the method for adjustment of the maximum of the LED chip group of described each section of LED load carrying voltage is: (key is to calculate the total maximum carrying magnitude of voltage of series block group) 1. be take pulsating dc voltage and mapped for abscissa as ordinate, pulsating direct current cycle (180 degree); 2. suppose a pure resistor load, the sinusoidal graphics area that its power forms at pulsating direct current half-wave is 1, mapping; 3. because LED voltage increases electric current, increase, essence is that power damages.The load power of setting LED load series block group is pure resistor load 120%, the rectangle echo that to make an area be 1.2, and the ordinate value of rectangle shade is the total maximum carrying magnitude of voltage of series block group; 4. in like manner, under known LED chip group carrying voltage condition, can map and draw the graphics area of chipset, the area sum of proofing chip group is greater than the sinusoidal wave area of pulsating direct current under the control node of switch piecemeal; 5. by commodity, choose the carrying magnitude of voltage of chipset in series block group, be added and be more than or equal to the total maximum carrying magnitude of voltage of series block group; Wherein, the higher LED chip group of carrying magnitude of voltage is near positive terminal (section begins), and the lower LED chip group of carrying magnitude of voltage is near negative pole end (latter end).
Realize the LED lighting circuit of preceding method, be characterized in: comprise that input connects the rectifier bridge of civil power, the positive pole of the output of rectifier bridge is connected to the positive pole of the LED load of 3～7 sections of serial connections, the negative pole of every section of LED load is connected on the connected node of driving power chip respectively, the negative pole of the output of rectifier bridge is connected to the earth terminal of driving power chip, on described driving power chip, be also provided with the operating voltage test side foremost that is connected to all LED loads, on described driving power chip, be also provided with the maximum pulsating dc voltage adjustable side that allows.
In aforesaid LED lighting circuit, described driving power chip comprises that voltage detecting and logic switch controller, voltage detecting and logic switch controller are provided with operating voltage test side and the maximum pulsating dc voltage adjustable side that allows; Also comprise connected node, each connected node is connected to earth terminal by switching tube respectively, and the control end of each switching tube is all connected on voltage detecting and logic switch controller.
In aforesaid LED lighting circuit, described each connected node is connected to same by switching tube respectively and merges on connecting line, by merging connecting line, be connected to earth terminal again, merge connecting line and be provided with current detection circuit, the output of current detection circuit is connected on voltage detecting and logic switch controller.
Compared with prior art, the present invention is converted into Rectified alternating current by rectifier bridge by civil power, voltage in each cycle is divided into multistage by phase place simultaneously, and utilize the different characteristic of voltage in multistage, use switch to regulate the hop count being connected in series into the LED load of operating state, thereby make LED load enter controlization, obtain an operational mode that approaches very much pulsating direct current power characteristic, this operational mode can meet LED chip power supply, and this LED type of drive of the present invention can greatly reduce the complexity of LED driving power, thereby make the built-in driving power of LED ray machine module become possibility, it is significant that this realizes larger versatility and interchangeability for LED bulb.
Accompanying drawing explanation
Fig. 1 is the LED voltage and current waveform of the embodiment of the present invention;
Fig. 2 is the extra-high pressure operate power oscillogram of the embodiment of the present invention;
The light modulation operate power oscillogram 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 circuit diagram of Fig. 5 embodiment of the present invention;
The LED voltage and current waveform of Fig. 6 embodiment of the present invention;
The LED chip array module power of Fig. 7: embodiment of the present invention DC52V series connection loads distribution map;
Fig. 8: embodiment of the present invention LED chip array carrying voltage tentative calculation figure;
Fig. 9: single DC52V chip bearing power tentative calculation figure of the embodiment of the present invention;
The LED chip array module power of Figure 10: embodiment of the present invention 2*52V+4*35V series connection loads distribution map.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated, but not as the foundation to the present invention's restriction.
Embodiment.LED driving method: civil power AC is converted into Rectified alternating current by rectifier bridge, the voltage of Rectified alternating current is greater than zero, is less than or equal to the specified maximum working voltage V of Rectified alternating current
wR3～7 sections of LED loads are set on Rectified alternating current, between each section of LED load, form series system, when the voltage of Rectified alternating current raises, the hop count of LED load series connection increases step by step, when the voltage drop of Rectified alternating current, the hop count of LED load series connection reduces step by step, and the hop count of LED load series connection is the actual LED load hop count that is connected into Rectified alternating current.The section of described LED load series connection is controlled by switch, the segmentation boundary that the control node of switch is voltage, and the number of fragments of described voltage is corresponding with the hop count of LED load.The negative pole direction of every section of LED load is connected respectively to the negative pole of Rectified alternating current by switch, then according to the change in voltage of Rectified alternating current, the break-make of each switch is controlled, used the change that the mode of a few sections of LED load cut-offs is realized to the hop count of LED load series connection.Set the pulsating direct current operating voltage V of whole Rectified alternating current
wbe greater than V
wmaxperiod, control all switches and disconnect, stop to all LED load supplyings, then by the given voltage V of outer setting one
tthe maximum of adjusting Rectified alternating current allows pulsating dc voltage V
wmaxsize, thereby realize the light modulation to LED; And can realize in a like fashion the voltage protection of LED.Described switch is at pulsating dc voltage ascent stage time delay t
m(as t
m=0.1ms) millisecond action; In the pulsating dc voltage decline stage, shift to an earlier date t
m(as t
m=0.1ms) millisecond action; To obtain LED operating current relatively stably.By being set, current sensor records effective operating current I in circuit
w, work as I
wsurpass design load KI
wRtime, close all switches to realize current protection, the unlatching of switch need recover after reloading voltage next time, and wherein K is for adjusting coefficient, I
wRfor specified effective operating current; The complete circuit that 2 groups of bands drivings and LED load are set was worked together with the while, wherein: 1 group of LED load has higher colour temperature, and as described given voltage V
twhen value is tending towards low, described maximum allows pulsating dc voltage V
wmaxbe tending towards high value; And another 1 group of LED load has lower colour temperature, as described given voltage V
twhen value is tending towards low, described maximum allows pulsating dc voltage V
wmaxbe tending towards low value.Regulate described given voltage V
tvalue can realize the adjustment of LED illumination colour temperature; Each section of LED load that setting is cascaded is the LED chip group with different maximum carrying magnitudes of voltage; Wherein, the LED load that the hop count of connecting in LED load enters operating state compared with Gao Shicai is set to have the LED chip group of relatively low maximum carrying magnitude of voltage, thereby has solved the low shortcoming of LED chip utilance.Adjustment side's key of the maximum carrying of described each section of LED load voltage is to calculate the total maximum carrying magnitude of voltage of series block group: the pulsating dc voltage of 1. take is mapped for abscissa as ordinate, pulsating direct current cycle (180 degree); 2. because LED voltage increases electric current, increase, essence is that power damages.Suppose a pure resistor load, the sinusoidal graphics area that its power forms at pulsating direct current half-wave is 1, mapping (referring to Fig. 8); 3. the load power of setting LED load series block group is pure resistor load 120%, the rectangle echo that to make an area be 1.2, and the ordinate value of rectangle shade is the total maximum carrying magnitude of voltage of series block group; 4. in like manner, under known LED chip group carrying voltage condition, can map and draw the graphics area of chipset, (referring to Fig. 9), the area sum of proofing chip group is greater than the sinusoidal wave area of pulsating direct current under the control node of switch piecemeal; 5. by commodity, choose the carrying magnitude of voltage of chipset in series block group, be added and be more than or equal to the total maximum carrying magnitude of voltage of series block group; Wherein, the higher LED chip group of carrying magnitude of voltage is near positive terminal (section begins), and the lower LED chip group of carrying magnitude of voltage is near negative pole end (latter end).
The LED lighting circuit of method before realizing: comprise that input connects the rectifier bridge B of civil power
1, rectifier bridge B
1the positive pole of output be connected to the positive pole of the LED load of multistage serial connection, the negative pole of every section of LED load is connected to driving power chip U respectively
1connected node J
1, J
2j
nupper, rectifier bridge B
1the negative pole of output be connected to driving power chip U
1earth terminal GND, described driving power chip U
1on be also provided with the operating voltage test side V foremost that is connected to all LED loads
w, described driving power chip U
1on be also provided with the maximum pulsating dc voltage adjustable side V of permission
wmax.Described driving power chip U
1comprise voltage detecting and logic switch controller U
2, voltage detecting and logic switch controller U
2be provided with operating voltage test side V
wallow pulsating dc voltage adjustable side V with maximum
wmax; Also comprise connected node J
1, J
2j
n, each connected node J
1, J
2j
nrespectively by switching tube K
1, K
2k
nbe connected to earth terminal GND, and each switching tube K
1, K
2k
ncontrol end be all connected to voltage detecting and logic switch controller U
2on.Described each connected node J
1, J
2j
nrespectively by switching tube K
1, K
2k
nbe connected to same and merge on connecting line, then be connected to earth terminal GND by merging connecting line, merge connecting line and be provided with current detection circuit, the output of current detection circuit is connected to voltage detecting and logic switch controller U
2on.
Below to take the operation principle of the present invention that 6 groups of LED loads are example.Be that n value is 6.
First, alternating current AC becomes Rectified alternating current after rectifier bridge, example: AC220V, 50Hz alternating current is after rectifier bridge rectification, referring to Fig. 1, voltage is the wavy curve of half period (180 degree), and cycle pulsating dc voltage when 0 spends is zero, and when 90 spend, pulsating dc voltage reaches maximum V
wRfor the highest DC311V, 180 when spend, and voltage reduces to again zero, goes round and begins again.
Pulsating dc voltage be greater than zero be less than or equal to V
wRbetween, 6 sections of loads are set altogether, between each section of load, form series system, with voltage, raise, load (being LED load) series connection hop count increases step by step, and load voltage is by switch controlled loading, and referring to Fig. 1 and Fig. 4, voltage switch node is voltage segmentation boundary.
Power supply management operational mode: the present invention is design current control device not, V is only depended in the keying of switches at different levels
wvariation, referring to Fig. 1, Fig. 4 and Fig. 5.
Cycle 0～90 is when spend:
The 1st section: work initial condition, the cycle is from 0 initial, K switch in circuit
1～K
6in opening (ON), electric current is mainly through node J
1pass through K switch
1form path, load is 1V by rated voltage
wRthe LED of/6 tandem workings forms;
The 2nd section: work as V
wbe more than or equal to 1V
wR/ 6 o'clock, K switch 1 was closed (OFF), and electric current mainly forms path through node J2 by K switch 2, and load is 2V by rated voltage
wRthe LED of/6 tandem workings forms;
The 3rd section: work as V
wbe more than or equal to 2V
wR/ 6 o'clock, K switch 1 was in OFF, and K switch 2 is closed (OFF), and electric current mainly forms path through node J3 by K switch 3, and load is 3V by rated voltage
wRthe LED of/6 tandem workings forms;
The 4th section: work as V
wbe more than or equal to 3V
wR/ 6 o'clock, K switch 1～K2 was in OFF, and K switch 3 is closed (OFF), and electric current mainly forms path through node J4 by K switch 4, and load is 4V by rated voltage
wRthe LED of/6 tandem workings forms;
The 5th section: work as V
wbe more than or equal to 4V
wR/ 6 o'clock, K switch 1～K3 was in OFF, and K switch 4 is closed (OFF), and electric current mainly forms path through node J5 by K switch 5, and load is 5V by rated voltage
wRthe LED of/6 tandem workings forms;
The 6th section: work as V
wbe more than or equal to 5V
wR/ 6 o'clock, K switch 1～K4 was in OFF, and K switch 5 is closed (OFF), and electric current forms path through node J6 by K switch 6, and load is 6V by rated voltage
wRthe LED of/6 tandem workings forms;
When K switch 1～K6 closes, the method for closing of time delay 0.1ms can be adopted, electric current relatively stably can be obtained.
Cycle 90～180 is when spend:
The 6th section: work initial condition, voltage is reduced downwards by maximum, and in circuit, K switch 1～K5 is in closed condition (OFF), and K switch 6 is in opening, and electric current forms path through node J6 by K switch 6, and load is 6V by rated voltage
wRthe LED of/6 tandem workings forms;
The 5th section: work as V
wbe less than or equal to 5V
wR/ 6 o'clock, K switch 5～K6 opened (ON), and electric current mainly forms path through node J5 by K switch 5, and load is 5V by rated voltage
wRthe LED of/6 tandem workings forms;
The 4th section: work as V
wbe less than or equal to 4V
wR/ 6 o'clock, K switch 4～K6 opened (ON), and electric current mainly forms path through node J4 by K switch 4, and load is 4V by rated voltage
wRthe LED of/6 tandem workings forms;
The 3rd section: work as V
wbe less than or equal to 3V
wR/ 6 o'clock, K switch 3～K6 opened (ON), and electric current mainly forms path through node J3 by K switch 3, and load is 3V by rated voltage
wRthe LED of/6 tandem workings forms;
The 2nd section: work as V
wbe less than or equal to 2V
wR/ 6 o'clock, K switch 2～K6 opened (ON), and electric current mainly forms path through node J2 by K switch 2, and load is 2V by rated voltage
wRthe LED of/6 tandem workings forms;
The 1st section: work as V
wbe less than or equal to 1V
wR/ 6 o'clock, K switch 1～K6 opened (ON), and electric current mainly forms path through node J1 by K switch 1, and load is 1V by rated voltage
wRthe LED of/6 tandem workings forms.
When K switch 1～K6 opens, the open method of 0.1ms in advance can be adopted, electric current relatively stably can be obtained.
Light modulation operational mode: the given voltage V of outer setting one
t=0 o'clock, V
wmaxcorresponding CV
wR, the given V of external voltage
tduring=5V, V
wmaxcorresponding 0V, arranges 0≤V
wmax≤ CV
wR, C adjusts coefficient, for the multiple of rated voltage, as C=1.12.V
wbe greater than V
wmaxperiod, the switch of corresponding each section will cut out (OFF), stop powering to the load.It act as a kind of light modulation scheme.Referring to Fig. 3, Fig. 4 and Fig. 5, regulate V
wmaxlower than V
wR, in figure, dash area will increase, and the power that is input to load will reduce, thereby reach the object of light modulation.Example: when LED in the normal work of AC220V civil power is, while adjusting alternating current voltage to the voltage of AC180V, the dash area in figure is V
wformation power perspective view part higher than 254V, from cycles approximately 55.5 degree to 124.5 degree, because corresponding K switch x in this period is in closing (OFF), the power consumption of dash area (be equivalent to pulsating direct current half-wave under normal civil power loading power 57.0%) by disallowable, this part power consumption is not loaded in load, and the brightness of load is reduced.Work as V
wmaxequal at 0 o'clock, all switches will cut out (OFF), and load supplying amount is zero.Can accomplish stepless dimming, and energy consumption can not occur.
Voltage protection operational mode: V is set
wmax=CV
wR.V
wbe greater than V
wmaxperiod, the switch of corresponding each section will cut out (OFF), stop powering to the load.Referring to Fig. 2, Fig. 4 and Fig. 5, example: when civil power reaches the high voltage of 270V, the dash area in figure is V
wformation power echo part higher than 348V, from cycles approximately 66 degree to 114 degree, because K1～K6 switch in this period is in cutting out (OFF), the power consumption of dash area (be equivalent to pulsating direct current half-wave under normal civil power loading power 50.2%) by disallowable, this part power consumption is not loaded in load, and load can not burnt because of overvoltage; When electrical network is surged, can there is instantaneous peak voltage widely higher than V
wmax, each section of switch, in closed condition, realized the object of the protection of surging this moment.
Overcurrent protection operational mode: the present invention has overcurrent protection, referring to Fig. 5, current sensor records effective operating current I in circuit
wsurpass design load KI
wR, K is for adjusting coefficient, example: set I
wR=275mA, K=1.2, logic switch controller will cut out all K switch 1～K6 (OFF), and opening switch (ON) K1～K6 need reload after power supply is pressed and recover in next time.
Colour temperature regulates operational mode: the complete circuit that 2 groups of bands drivings and LED load are set was worked together with the while, wherein: 1 group of LED load has higher colour temperature, and as the given voltage V of outer setting
t=0 o'clock, the maximum pulsating dc voltage V that allows
wmax=CV
wR, given voltage V
t=5 o'clock, the maximum pulsating dc voltage V that allows
wmax=0; And another 1 group of LED load has lower colour temperature, as the given voltage V of outer setting
t=0 o'clock, the maximum pulsating dc voltage V that allows
wmax=0, given voltage V
t=5 o'clock, the maximum pulsating dc voltage V that allows
wmax=CV
wR.Regulate the given voltage V of outer setting
tvalue can realize the adjustment of LED illumination colour temperature, and the principle that colour temperature regulates is approaching with light modulation operational mode, can be referring to Fig. 5, but can only can not adjust brightness by color-temperature regulating under this pattern.
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 is larger, easily in electrical network, produces low-order harmonic, referring to Fig. 6; Segmentation is many, and circuit structure is complicated.Generally get 4～6 sections for good.
Note: V
w-pulsating direct current operating voltage (1.4142* alternating voltage); V
wRthe specified maximum working voltage of-pulsating direct current (1.4142* alternating voltage); V
wmax-maximum the pulsating dc voltage (1.4142* alternating voltage) that allows; I
w-effective operating current.I
wR-specified effective operating current.
If civil power is AC220, the voltage after rectification is DC311V, take every group of LED load as single chips be example, every chips bears DC52V; As AC110, chip bears DC26V.If the loading power area of pulsating direct current half-wave is 1, referring to Fig. 7, it is larger that each LED load in figure (LED module 1 to 6) is loaded power difference, LED module 1 reach pulsating direct current half-wave loading power area 20.68% (for chip rated output 84.4%); And LED module 6 only have 5.11% (for chip rated output 19.2%), be about 1/4th power of module 1, through actual measurement checking, the intrinsic brilliance of module 6 is very low; The power being on average loaded of whole chipset is 52.4% of chip rated output, and the utilance of chip is lower; And the rated output of chipset (dotted line frame area) is the loading power area of pulsating direct current half-wave 159%.Because chip amount of redundancy is excessive, not only chip waste, also causes driving power excessive and waste, and has increased the difficulty that cloth is set up simultaneously.Therefore, under Constant Direct Current state, select the method for chip voltage to have some problems under pulsating direct current state, how to guarantee that, under the prerequisite of chip trouble free service, the utilance that improves chip becomes a problem to be solved.
The rated output of setting the LED chip array of 6 series connection loads 1.59 times of power by pulsating direct current half-wave and turns down to 1.2 times that (because LED voltage increases electric current, increase, essence is that power damages.1.2 times power surpluses are set and enough guarantee that LED is not burnt), referring to Fig. 8, when if LED chip array chip load power (rectangle dash area area in figure) is that pulsating direct current half-wave loads 1.2 times of power (pulsating direct current half-wave part area), in the time of can being extrapolated civil power and be AC220V by Fig. 8 mapping, the carrying voltage of chip array be DC236V;
Referring to Fig. 9, LED module 1 is arranged respectively to different magnitudes of voltage to module 6, the chip that can obtain under different bearer magnitude of voltage loads power area (dash area in figure);
Adopt 2*52V+4*35V high voltage chip (model of module 1 and module 2 is that VES-AADBHV45, module 3 are ES-AADBHF40 to module 6) to form serial array, the carrying voltage of chip array is adjusted into DC244V; Make Figure 10, it is 96.67% of pulsating direct current half-wave power area that the chip array of acquisition is loaded power area, and the power that chip array is loaded approaches 1 for perfect condition; The power that now LED chip array is loaded is chip array rated output 77.6%; Experimental verification and estimated value are close.
The module of each voltage section loads power checking: the loading power area of establishing pulsating direct current half-wave is 1, and when voltage is ordinate, easily by Fig. 9, calculating DC52V chip rated output is 26.52%, and in like manner, the rated output of DC35V chip is 17.89%; Figure 10 is civil power while being AC220V, the power situation being loaded of each module of LED chip array; Table 1 is that power that chip array is loaded is while being pulsating direct current half-wave power area 1, line voltage is respectively AC220V, AV246V, each module of AC270V is loaded the situation of power, in table, can find out, only module 3 slightly transships at DC311V and DC348V, but because module 1 and module 2 have margin of power, experimental results show that module 3 can pass through.
When other line voltage grades, optimal way is with reference to above-mentioned carrying out.
Under perfect condition, the checking computations of chip bearing power are as shown in the table:
Claims (11)
1.LED driving method, is characterized in that: civil power AC is converted into Rectified alternating current by rectifier bridge, and the voltage of Rectified alternating current is greater than zero, is less than or equal to the specified maximum working voltage V of Rectified alternating current
wR3～7 sections of LED loads are set on Rectified alternating current, each section of LED load is cascaded and forms LED load series block group, when the voltage of Rectified alternating current raises, the hop count of LED load series connection increases step by step, when the voltage drop of Rectified alternating current, the hop count of LED load series connection reduces step by step, and the hop count of LED load series connection is the actual LED load hop count that is connected into Rectified alternating current.
2. LED driving method according to claim 1, is characterized in that: the hop count of described LED load series connection is controlled by switch, the segmentation boundary that the control node of switch is voltage, and the number of fragments of described voltage is corresponding with the hop count of LED load series connection; The control method of the hop count of described LED load series connection is, the negative pole direction of every section of LED load is connected respectively to the negative pole of Rectified alternating current by switch, then according to the change in voltage of Rectified alternating current, the break-make of each switch is controlled, used the mode that a few sections of switches are opened circuit to realize the change of the hop count of LED load series connection.
3. LED driving method according to claim 2, is characterized in that: the pulsating direct current operating voltage V that sets Rectified alternating current
wbe greater than V
wmaxperiod, control all switches and disconnect, stop to all LED load supplyings, realize the overvoltage of LED and surge protection; By the given voltage V of outer setting one
tthe maximum of adjusting Rectified alternating current allows pulsating dc voltage V
wmaxsize, thereby realize the luminosity adjustment to LED.
4. LED driving method according to claim 2, is characterized in that: described switch is at pulsating dc voltage ascent stage time delay t
mmillisecond action; In the pulsating dc voltage decline stage, shift to an earlier date t
mmillisecond action; To obtain LED operating current relatively stably.
5. LED driving method according to claim 2, is characterized in that: by current sensor is set, record effective operating current I in circuit
w, work as I
wsurpass design load KI
wRtime, close all switches to realize current protection, the unlatching of switch need recover after reloading voltage next time, and wherein K is for adjusting coefficient, I
wRfor specified effective operating current.
6. LED driving method according to claim 2, is characterized in that: the complete circuit that 2 groups of bands drivings and LED load are set was worked together with the while, wherein: 1 group of LED load has higher colour temperature, and as described given voltage V
twhen value is tending towards low, described maximum allows pulsating dc voltage V
wmaxbe tending towards high value; And another 1 group of LED load has lower colour temperature, as described given voltage V
twhen value is tending towards low, described maximum allows pulsating dc voltage V
wmaxbe tending towards low value.Regulate described given voltage V
tvalue can realize the adjustment of LED illumination colour temperature.
7. LED driving method according to claim 1, it is characterized in that: it is the LED chip group with different maximum carrying magnitudes of voltage that each section of LED load being cascaded is set, and can make the LED load series block group of working under switch is controlled obtain the operating current curve that approaches ideal sine wave.
8. LED driving method according to claim 7, is characterized in that, the method for adjustment of the maximum carrying of described each section of LED load voltage is: 1. take pulsating dc voltage as ordinate, pulsating direct current cycle be abscissa mapping; 2. suppose a pure resistor load, the sinusoidal graphics area that its power forms at pulsating direct current half-wave is 1, mapping; 3. the load power of setting LED load series block group is pure resistor load 120%, the rectangle echo that to make an area be 1.2, and the ordinate value of rectangle shade is the total maximum carrying magnitude of voltage of series block group; 4. in like manner, under known LED load-carrying voltage condition, can map and draw the graphics area of LED load, the area sum of verifying piecemeal LED load is greater than the sinusoidal wave area of pulsating direct current under the control node of switch; 5. choose the carrying magnitude of voltage of each section of LED load in LED load series block group, be added and be more than or equal to the total maximum carrying magnitude of voltage of series block group; Wherein, the higher LED load of carrying magnitude of voltage is near positive terminal, and the lower LED load of carrying magnitude of voltage is near negative pole end.
9. the LED lighting circuit of realizing method described in the arbitrary claim of claim 1 to 8, is characterized in that: comprise that input connects the rectifier bridge (B of civil power
1), rectifier bridge (B
1) the positive pole of output be connected to the positive pole of the LED load of 3～7 sections of serial connections, the negative pole of every section of LED load is connected to driving power chip (U respectively
1) connected node (J
1, J
2j
n) upper, rectifier bridge (B
1) the negative pole of output be connected to driving power chip (U
1) earth terminal (GND), described driving power chip (U
1) on be also provided with the operating voltage test side (V foremost that is connected to all LED loads
w), described driving power chip (U
1) on be also provided with the maximum pulsating dc voltage adjustable side (V of permission
wmax).
10. LED lighting circuit according to claim 9, is characterized in that: described driving power chip (U
1) comprise voltage detecting and logic switch controller (U
2), voltage detecting and logic switch controller (U
2) be provided with operating voltage test side (V
w) and the maximum pulsating dc voltage adjustable side (V that allows
wmax); Also comprise connected node (J
1, J
2j
n), each connected node (J
1, J
2j
n) respectively by switching tube (K
1, K
2k
n) be connected to earth terminal (GND) and each switching tube (K
1, K
2k
n) control end be all connected to voltage detecting and logic switch controller (U
2) on.
11. LED lighting circuits according to claim 10, is characterized in that: described each connected node (J
1, J
2j
n) respectively by switching tube (K
1, K
2k
n) be connected on same merging connecting line, then be connected to earth terminal (GND) by merging connecting line, and merging connecting line and be provided with current detection circuit, the output of current detection circuit is connected to voltage detecting and logic switch controller (U
2) 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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| CN103957649B CN103957649B (en) | 2018-03-13 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600278A (en) * | 2005-02-04 | 2009-12-09 | 莱特光电公司 | Light emitting diode multiphase driver circuit |
| CN202652660U (en) * | 2012-07-17 | 2013-01-02 | 北京佰能光电技术有限公司 | LED bulb |
| 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 |
-
2014
- 2014-05-20 CN CN201410211945.8A patent/CN103957649B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600278A (en) * | 2005-02-04 | 2009-12-09 | 莱特光电公司 | Light emitting diode multiphase driver circuit |
| CN202652660U (en) * | 2012-07-17 | 2013-01-02 | 北京佰能光电技术有限公司 | LED bulb |
| 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 |
Cited By (16)
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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 |
| CN106797691A (en) * | 2014-09-26 | 2017-05-31 | 夏普株式会社 | Lighting device |
| CN104791627A (en) * | 2015-04-21 | 2015-07-22 | 贵州光浦森光电有限公司 | Establishing method of LED filament lamp and 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 |
| 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 |
| CN105627130A (en) * | 2016-03-11 | 2016-06-01 | 贵州光浦森光电有限公司 | LED lamp filament bulb with thermal radiation supports |
| CN105627124A (en) * | 2016-03-11 | 2016-06-01 | 贵州光浦森光电有限公司 | LED lamp filament assembly, method for forming LED lamp filament bulb and LED lamp filament bulb |
| 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 |
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| 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 |
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