CN105722287A - Linear LED drive circuit and drive method thereof - Google Patents
Linear LED drive circuit and drive method thereof Download PDFInfo
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- CN105722287A CN105722287A CN201410738266.6A CN201410738266A CN105722287A CN 105722287 A CN105722287 A CN 105722287A CN 201410738266 A CN201410738266 A CN 201410738266A CN 105722287 A CN105722287 A CN 105722287A
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Abstract
The invention provides a linear LED drive circuit and a drive method thereof. The linear LED drive circuit includes a voltage input module, an LED lamp string as load, switch tubes, a constant-current control tube, a sampling resistor, and a control drive module, wherein the switch tubes are connected with each lamp segment of the LED lamp string in parallel and are used for adjusting the number of LEDs; the constant-current control tube is connected with the LED lamp string, and is used for adjusting the current to realize constant-current output; the sampling resistor is connected with the constant-current control tube, and is used for converting the current into sampling voltage; and the control drive module is connected with the two ends of the constant-current control tube, and is used for detecting the voltage of the output end of the LED lamp string and the voltage of the output end of the constant-current control tube and outputting the control signals of each switch tube and the constant-current control tube. The linear LED drive circuit and the drive method thereof can adjust the number of the lightened LEDs through detection of the voltage of the input end of the constant-current control tube so as to reduce the voltage on the constant-current control tube, and can realize high output efficiency, a high power factor and a low input harmonic wave within the whole input voltage range, and also can improve the utilization rate of LEDs through series-parallel connection of LEDs.
Description
Technical field
The present invention relates to LED Drive Control Technique field, particularly relate to a kind of linear LED drive circuit and method.
Background technology
The advantage that LED is too late because having the conventional light source such as efficiency height, life-span length, not cracky, high, the reliability height of switching speed, has been widely used in display lamp, display and lighting field.The semiconductor device worked when LED is a kind of low-voltage direct, it is necessary to meet illumination application by current constant control.
Efficiency overall in linear LED drives is determined with input voltage by LED conducting voltage:
Being common linear LED as shown in Figure 1 and drive structure 1, alternating current power supply provides input voltage V after rectification moduleIN, described input voltage VINCurrent constant control pipe it is connected to after the LED of multiple series connection；Described current constant control pipe is positioned at chip internal (not shown), and described current constant control pipe, then through being connected to ground after being connected to sampling resistor by No. 5 ports (CS) of described chip, forms the power supply path to ground.1～No. 4 port (D4～D1) of described chip is connected with the LED of series connection, for controlling the conducting of each section of LED.
Owing to described chip pin is fixing, the quantity of the LED therefore connected is also to be fixing, at input voltage VINVoltage unnecessary when exceeding LED forward drop be by each section of LED below current constant control pipe undertake, VIN-VLEDBeing exactly the voltage on described current constant control pipe, before next section of LED conducting, this portion voltage can be higher, and therefore described current constant control pipe needs to undertake the voltage that comparison is high, and whole efficiency is not high yet simultaneously.
Although each section of LED voltage can be reduced by increase LED segment number, thus before reducing hop count switching on current constant control pipe the voltage of loss to improve some efficiency, it is contemplated that in practical situations, the hop count of the LED of series connection is fewer, the quantity of every section of LED is relatively more, causes that the quantity of each section of LED is unable to reach minimum, therefore, the voltage that during switching, described current constant control pipe undertakes is still higher, and efficiency cannot carry to the highest.And the hop count restriction of the LED due to series connection; a number of LED is also limited; in order to ensure LED utilization rate; quantity total for LED can only design by exemplary input voltage; the pressure drop that these are unnecessary when high input voltage is just all applied on current constant control pipe; thus causing that efficiency comparison is low, chip easily generates heat and excess temperature Thermal protection.
Therefore, how improving the LED whole efficiency driven is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of linear LED drive circuit and method, for solving the problems such as the whole efficiency that in prior art, LED drives is low, power factor (PF) is low.
For achieving the above object and other relevant purposes, the present invention provides a kind of linear LED drive circuit, and described linear LED drive circuit at least includes:
Voltage input module, is used for providing input voltage；
LED string, is connected to described voltage input module, and described LED string includes first quantity n lamp section, and each lamp section is connected in series, and in each lamp section, the quantity of LED is that binary system increases；
First quantity n switching tube, each paralleled power switches is in each lamp section, for being realized the adjustment of the LED quantity being lit in described LED string by the turn-on and turn-off of each switching tube；
Current constant control pipe, is connected to the outfan of described LED string, is used for regulating electric current and realizes constant current output；
Sampling resistor, for being converted to sampled voltage by the electric current that described current constant control pipe exports；
Control to drive module, be connected to the two ends of described current constant control pipe, for detecting described LED string outfan and the voltage of described current constant control pipe outfan, and export each switching tube and the control signal of described current constant control pipe.
Preferably, each lamp section is sequentially connected with, and in each lamp section, the quantity of LED raises with current potential and is incremented by, and the quantity comprising LED in kth lamp section is 2k-1Individual, wherein, 1≤k≤n.
It is highly preferred that also include the second quantity (n-1) individual auxiliary switch, one end of each auxiliary switch connects the outfan of each lamp section, and the other end connects the central point of a upper lamp section, and the LED number in this lamp section is divided equally by each lamp section central point.
More preferably, the control signal of each auxiliary switch is together decided on by the control signal of the switching tube at two the adjacent lamps section two ends being connected with respectively this auxiliary switch, when the switching tube at next lamp section two ends turns off, when the switching tube at upper lamp section two ends turns on, this auxiliary switch turns on.
Preferably, described control drives module to include ON-OFF control circuit and comparison circuit, the input of described ON-OFF control circuit is connected between described LED string and described current constant control pipe, and the control signal exporting each switching tube according to the voltage detected is lit with the LED realizing varying number；Described comparison circuit is connected between described current constant control pipe and described sampling resistor, is compared with reference voltage by the sampled voltage between described current constant control pipe and described sampling resistor, and exports the control voltage of described current constant control pipe to regulate current constant.
It is highly preferred that the reverse input end of described comparison circuit connects described sampled voltage, positive input connects described reference voltage.
It is highly preferred that described reference voltage is provided by described ON-OFF control circuit.
For achieving the above object and other relevant purposes, the present invention also provides for a kind of linear LED driving method, described linear LED driving method at least includes: the ascent stage of described input voltage: open circuit, each switching tube is both turned on, described input voltage rises, based on the described voltage controlling and driving module to detect described current constant control pipe input, when the voltage of described current constant control pipe input is more than the first setting value, adjusting each switching tube and light the LED of respective numbers, the voltage of described current constant control pipe input declines；Described input voltage continues to rise, and the voltage of described current constant control pipe input continues to rise, and when the voltage of described current constant control pipe input is again more than described first setting value, again adjusts each switching tube and lights the LED of respective numbers；Change according to described input voltage is sequentially adjusted in each switching tube and lights the LED of respective numbers, makes the voltage that described current constant control pipe bears be not more than described first setting value；Minimum adjustable LED quantity is 1 LED；
The decline stage of described input voltage: described input voltage declines, based on the described voltage controlling and driving module to detect described current constant control pipe input, when the voltage of described current constant control pipe input is less than the second setting value, adjusting each switching tube and extinguish the LED of respective numbers, the voltage of described current constant control pipe input rises；Described input voltage continues to decline, and the voltage of described current constant control pipe input continues to decline, and when the voltage of described current constant control pipe input is again less than described second setting value, again adjusts each switching tube and extinguishes the LED of respective numbers；Change according to described input voltage is sequentially adjusted in each switching tube and extinguishes the LED of respective numbers, makes the voltage that described current constant control pipe bears be not less than described second setting value；Minimum adjustable LED quantity is 1 LED.
Preferably, a described setting value is VLED+VREG, described second setting value is VREG, wherein, VLEDFor single led forward conduction voltage drop, VREGDescribed current constant control pipe and the minimum voltage sum on described sampling resistor during for described current constant control pipe normal operation.
Preferably, when in two the adjacent lamps sections being connected with each auxiliary switch, the switching tube at next lamp section two ends turns off, and the switching tube at upper lamp section two ends turns on, this auxiliary switch turns on, the connection in series-parallel of LED can be realized, when identical input voltage, improve the utilization rate of LED.
Preferably, the control signal of described input voltage and each switching tube has one-to-one relationship, can utilize this relation that electric current is individually controlled, to realize constant power output within the scope of certain voltage.
As it has been described above, the linear LED drive circuit of the present invention and method, have the advantages that
The linear LED drive circuit of the present invention and method adopt the LED segmented mode of binary number, switching tube is in parallel with each section of LED, making the LED number every time adjusted minimum by the turn-on and turn-off of each switching tube is 1, therefore the voltage on current constant control pipe can be preferably minimized, and realizes high delivery efficiency, High Power Factor and low input harmonics in whole input voltage range；Additionally the linear LED drive circuit of the present invention and method utilize auxiliary switch that LED is carried out connection in series-parallel and can be greatly improved the utilization rate of LED.
Accompanying drawing explanation
Fig. 1 is shown as linear LED of the prior art and drives structural representation.
Fig. 2 is shown as embodiment one schematic diagram of the linear LED drive circuit of the present invention.
Fig. 3 is shown as the input voltage of the linear LED drive circuit of the present invention and the waveform diagram of input current.
Fig. 4 is shown as embodiment two schematic diagram of the linear LED drive circuit of the present invention.
Element numbers explanation
1 linear LED drives structure
2 linear LED drive circuits
21 voltage input modules
211 alternating current power supplys
212 rectification modules
22 control to drive module
221 ON-OFF control circuit
222 comparison circuits
Q1～Q7 the first switching tube～the 7th switching tube
Q8 current constant control pipe
LED1～LED7 the first lamp section～the 7th lamp section
Q1_1～Q6_1 the first auxiliary switch～the 6th auxiliary switch
VINInput voltage
VTH1First setting voltage
VTH2Second setting voltage
Vref reference voltage
VCSSampled voltage
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art the content disclosed by this specification can understand other advantages and effect of the present invention easily.The present invention can also be carried out by additionally different detailed description of the invention or apply, and the every details in this specification based on different viewpoints and application, can also carry out various modification or change under the spirit without departing from the present invention.
Refer to Fig. 2～Fig. 4.It should be noted that, the diagram provided in the present embodiment only illustrates the basic conception of the present invention in a schematic way, then assembly that in graphic, only display is relevant with the present invention but not component count when implementing according to reality, shape and size drafting, during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random change, and its assembly layout kenel is likely to increasingly complex.
Embodiment one
As in figure 2 it is shown, the present invention provides a kind of linear LED drive circuit 2, described linear LED drive circuit 2 at least includes:
Voltage input module 21, is used for providing input voltage VIN；
LED string, is connected to described voltage input module 21, and described LED string includes first quantity n lamp section, and each lamp section is connected in series, and in each lamp section, the quantity of LED is that binary system increases；
First quantity n switching tube, each paralleled power switches is in each lamp section, for being realized the adjustment of the LED quantity being lit in described LED string by the turn-on and turn-off of each switching tube；
Current constant control pipe Q8, is connected to the outfan of described LED string, is used for regulating electric current and realizes constant current output；
Sampling resistor RCS, one end is connected to described current constant control pipe Q8, other end ground connection GND, for the electric current that described current constant control pipe Q8 exports is converted to sampled voltage VCS；
Control to drive module 22, be connected to the two ends of described current constant control pipe Q8, for detecting described LED string outfan and the voltage of described current constant control pipe Q8 outfan, and export each switching tube and the control signal of described current constant control pipe Q8.
As in figure 2 it is shown, described voltage input module 21 includes alternating current power supply 211, electric fuse F1 and rectification unit 212.
Specifically, in the present embodiment, described alternating current power supply 211 output voltage is sinusoidal voltage, and one end of described alternating current power supply 211 is connected to described rectification unit 212, and the other end is connected to described rectification unit 212 through described electric fuse F1.Described electric fuse F1 is connected between described alternating current power supply 211 and described rectification module 212, is used for protecting described voltage input module 21；Described rectification unit 212 includes two groups of diode groups of parallel connection, and each diode group includes two diodes of series connection, and described alternating current power supply 211 is connected to via described electric fuse F1 between two diodes of each diode group.As described in Figure 2, diode D1 connects with diode D3, diode D2 connects with diode D4, one end ground connection, the other end are as the outfan of described voltage input module, as the input of described rectification module 212 between described diode D1 with described diode D3, be connected described alternating current power supply 211, between described diode D2 with described diode D4 as another input of described rectification module 212, be connected described electric fuse F1 after be connected to described alternating current power supply 211.The output voltage of described voltage input module 21 is the commutating voltage V after sinusoidal voltage rectificationIN, it is the absolute value of sinusoidal voltage.
As in figure 2 it is shown, described LED series winding is connected to described voltage input module 21, as load, described LED string includes first quantity n lamp section, and each lamp section is connected in series, and in each lamp section, the quantity of LED is that binary system increases.
Specifically, in the present embodiment, the quantity first quantity n of described LED section is set as 7, and in each lamp section, the quantity of LED raises with current potential and is incremented by binary system, and the quantity comprising LED in kth lamp section is 2k-1Individual, wherein, 1≤k≤n.First lamp section LED1 is connected to the input of described current constant control pipe Q8, including 20Individual LED；Second lamp section LED2 is connected to described first lamp section LED1, including 21Individual LED；3rd lamp section LED3 is connected to described second lamp section LED2, including 22Individual LED；4th lamp section LED4 is connected to described 3rd lamp section LED3, including 23Individual LED；5th lamp section LED5 is connected to described 4th lamp section LED4, including 24Individual LED；6th lamp section LED6 is connected to described 5th lamp section LED5, including 25Individual LED, the 7th lamp section LED7 are connected between described 6th lamp section LED6 and described voltage input module 21, including 26Individual LED.
As in figure 2 it is shown, described first quantity n paralleled power switches is in each lamp section, general performance is the series connection of each switching tube, for being realized the adjustment of the LED quantity being lit in described LED string by the turn-on and turn-off of each switching tube.
Specifically, in the present embodiment, described first quantity n is set as 7, and each switching tube is injectron.7 injectrons are parallel to the two ends of each lamp section respectively.First switching tube Q1 is parallel to the outfan S1 and input S2 of described first lamp section LED1；Second switch pipe Q2 is parallel to the outfan S2 and input S3 of described second lamp section LED2；3rd switching tube Q3 is parallel to the outfan S3 and input S4 of described 3rd lamp section LED3；4th switching tube Q4 is parallel to the outfan S4 and input S5 of described 4th lamp section LED4；5th switching tube Q5 is parallel to the outfan S5 and input S6 of described 5th lamp section LED5；6th switching tube Q6 is parallel to the outfan S6 and input S7 of described 6th lamp section LED6；7th switching tube Q7 is parallel to the outfan S7 and input HV of described 7th lamp section LED7.Owing to each switching tube is high-voltage tube, therefore more pressure, it is possible to control more LED segment number and quantity, in the scope of whole input voltage, realize high efficiency.
As in figure 2 it is shown, described current constant control pipe Q8, it is connected to the outfan of described LED string, is used for regulating electric current and realizes constant current output.
Specifically, described current constant control pipe Q8 can be any devices that can realize current constant control such as audion, and in the present embodiment, described current constant control pipe Q8 is NMOS tube.When described control drives module to detect that the electric current in path is excessive, the gate voltage controlling described current constant control pipe Q8 reduces with this electric current reducing in path；When described control drives module to detect that the electric current in path is too small, the gate voltage controlling described current constant control pipe Q8 increases with this electric current increasing in path；Changed the electric current regulated in path by the gate voltage of described current constant control pipe Q8, make current constant.
As in figure 2 it is shown, described sampling resistor RCSOne end be connected to described current constant control pipe Q8, other end ground connection GND, for by described current constant control pipe Q8 export electric current be converted to sampled voltage VCS。
Specifically, described sampling resistor RCSSample rate current is converted into sampled voltage VCS, it is simple to described control drives module 22 to process.
As in figure 2 it is shown, the described two ends controlling to drive module 22 to be connected to described current constant control pipe Q8, for detecting described LED string outfan and the voltage of described current constant control pipe Q8 outfan, and export each switching tube and the control signal of described current constant control pipe Q8.
Specifically, described control drives module 22 ON-OFF control circuit 221 and comparison circuit 222.
The input of described ON-OFF control circuit 221 is connected between described LED string and described current constant control pipe Q8, i.e. S1 end, and according to the voltage of the S1 end detected and the first setting value VTH1And the second setting value VTH2Relatively, the control signal exporting each switching tube is lit with the LED realizing varying number.The control signal of described first switching tube Q1 is K1；The control signal of described second switch pipe Q2 is K2；The control signal of described 3rd switching tube Q3 is K3；The control signal of described 4th switching tube Q4 is K4；The control signal of described 5th switching tube Q5 is K5；The control signal of described 6th switching tube Q6 is K6；The control signal of described 7th switching tube Q7 is K7.The control signal K7K6K5K4K3K2K1 of each switching tube is as shown in the table with the relation of the corresponding quantity being lit LED, and wherein, 1 represents that switching tube turns off, 0 expression switching tube turns on:
When needing to light LED one by one according to input voltage, by described first setting value VTH1It is set as VLED+VREG, wherein, VLEDFor single led forward conduction voltage drop, VREGDescribed current constant control pipe Q8 and described sampling resistor R during for described current constant control pipe Q8 normal operationCSOn minimum voltage sum.VREGBe according to described current constant control pipe Q8 can the minimum voltage scope definition of normal operation, can the minimum voltage of normal operation and now described sampling resistor R including described current constant control pipe Q8CSOn voltage, it is assumed that by VREGIt is defined as 2V, works as Vds+VCS> 2V time, described current constant control pipe Q8 can constant adjustment electric current, work as Vds+VCS< during 2V, described current constant control pipe Q8 just cannot constant current, output electric current can reduce, and illustrating that described current constant control pipe Q8 enters cannot the scope of constant current.In order to avoid described current constant control pipe Q8 the concussion of LED number of variations, V can occur during the minimum voltage of normal operationREGCan slightly set height a bit.
When starting, the control signal K7K6K5K4K3K2K1 of each switching tube is 0000000, and each switching tube is both turned on, and each LED all extinguishes, with described input voltage VINIncrease, S1 terminal voltage Vds+Vcs > VTH1(=VLED+VREG) time, now system call interception lights 1 LED more, it is 0000001 that described ON-OFF control circuit 221 exports the control signal of each switching tube, described first switching tube Q1 turns off, rest switch pipe is both turned on, now only having 1 LED in described first lamp section LED1 to be lit, S1 terminal voltage Vds+Vcs declines, and becomes Vds+Vcs > VREG, now described current constant control pipe Q8 normal operation, can constant adjustment electric current, the efficiency of system is greatly improved:Along with described input voltage VINContinuous rising, when the voltage of S1 end is again more than described first setting value VTH1Time, it is 0000010 that described ON-OFF control circuit 221 exports the control signal of each switching tube, and described second switch pipe Q2 turns off, rest switch pipe is both turned on, now only having 2 LED in described second lamp section LED2 to be lit, S1 terminal voltage declines, now described current constant control pipe Q8 normal operation.Described input voltage VINConstantly increasing, described ON-OFF control circuit 221 exports the control signal of each switching tube increases the LED quantity being lit one by one, and control signal is as shown above.
Consider to need a lot of step from the change of 0000000 to 1111111, as described input voltage VINWhen having a very big saltus step, adjustment can be slow, and therefore when the voltage ratio of S1 end is higher, control signal can be done accordingly and add 2, adds 4, adds 8 ... addition, it is possible to be greatly shortened the time of response, described first setting value VTH1May be set to p*VLED+VREG, wherein, p is the LED quantity needing each time to adjust, can value 1,2,3,4 ....Meanwhile, the method can reduce the number of LED segmentation.
In like manner, at described input voltage VINDecline stage, the second setting value VTH2For VREG, described input voltage VINDuring decline, S1 terminal voltage declines, as S1 terminal voltage Vds+VCS<VREGIf now system still turns on the LED of as much, and described current constant control pipe Q8 will enter the interval that cannot adjust electric current, output electric current will decline, and therefore, described ON-OFF control circuit 221 controls each switching tube and adjusts accordingly, system extinguishes LED, a S1 terminal voltage Vds+VCSRise, become VREG+VLED, described current constant control pipe Q8 again can constant current.
Described comparison circuit 222 is connected to described current constant control pipe Q8 and described sampling resistor RCSBetween, by described current constant control pipe Q8 and described sampling resistor RCSBetween sampled voltage VCSCompare with reference voltage Vref, and export the control voltage of described current constant control pipe Q8 to regulate current constant.As in figure 2 it is shown, in the present embodiment, the reverse input end of described comparison circuit 222 connects described sampled voltage VCS, positive input connect described reference voltage Vref, described reference voltage Vref is provided by described ON-OFF control circuit 221.
As in figure 2 it is shown, in the present embodiment, the input resistance R being connected to voltage input module 21 is also includedINAnd it is connected to described input resistance RINAnd the electric capacity C between ground GND, described input resistance RINOutput voltage VCC as described control drive module 22 power supply.Described control drives the power supply of module 22 can also be provided by external power source.
The scope of the linear LED drive circuit 2 output voltage adjustment of the present invention is 127*VLED, VLEDFor single led forward conduction voltage drop, usual VLEDAt about 3.3V, therefore the scope of output voltage is 0～419.1V, it is possible to cover the input voltage range of 0～300Vac.In this scope, the pressure drop on described current constant control pipe Q8 can control at 1*VLEDLeft and right, relatively total input voltage loss is very little, and therefore overall efficiency can be accomplished significantly high.
When practical application, input voltage typically up to only 264Vac, therefore can described 7th lamp section LED7 need not, but the LED of an external fixed number (q is individual), so can reducing the switching tube number of chip internal, the adjusting range of output voltage is q*VLED～(q+63) * VLED, q can oneself set.Owing to the voltage on described current constant control pipe Q8 before q LED conducting is still relatively low, therefore whole efficiency is still significantly high.
Simultaneously, the linear LED drive circuit 2 of the present invention can realize high power factor control, owing to all LED are cascaded, therefore a constant flow module just can control electric current, owing to the LED quantity of minimum conducting is 1, therefore, it is possible to be greatly increased the angle of flow of input voltage, thus realize high power factor.For when under different input voltages, the LED of difference numbers turns on, the control signal K1 of each switching tube～K7 is a value determined, therefore LED current at different levels can be done special optimization, as shown in Figure 3, for the control signal K1～K7 output of each switching tube, electric current is the highest can 127 grades of different values (0000001～1111111), can make electric current ILEDWaveform is closer to input voltage VINWaveform, namely imitative sine-wave current controls, thus obtaining high power factor.When only 1 LED conducting, now On current also be minima, the intermodulation distortion of input current when therefore can be effectively improved input voltage zero crossing, is truly realized high power factor and low input harmonics.
Additionally, due to the control signal K1 of each switching tube～K7 is known and fixing for external input voltage, therefore LED every one-level electric current can also realize extra function by internal algorithm, for instance realizes constant power output in certain input voltage range.
Embodiment two
The basis of embodiment one adds auxiliary switch in the present embodiment, for realizing the connection in series-parallel of LED, improves the utilization rate of LED in the linear LED drive circuit 2 of the present invention.
As shown in Figure 4, in the present embodiment, adding the second quantity (n-1) individual auxiliary switch, one end of each auxiliary switch connects the outfan of each lamp section, the other end connects the central point of a upper lamp section, and the LED number in this lamp section is divided equally by each lamp section central point.
Specifically, described LED string includes first quantity n lamp section, and the quantity of described auxiliary switch is the second quantity (n-1).In the present embodiment, owing to described LED string includes 7 lamp sections, therefore, described second quantity (n-1) is 6, respectively the first auxiliary switch Q1_1, the second auxiliary switch Q2_1, the 3rd auxiliary switch Q3_1, the 4th auxiliary switch Q4_1, the 5th auxiliary switch Q5_1, the 6th auxiliary switch Q6_1.One end of described first auxiliary switch Q1_1 connects the outfan S1 of described first lamp section LED1, the other end connects the central point of described second lamp section LED2, LED in described second lamp section LED2 is equally divided into two parts by quantity by the central point of described second lamp section LED2, and namely the both sides of central point respectively include 1 LED；One end of described second auxiliary switch Q2_1 connects the outfan S2 of described second lamp section LED2, the other end connects the central point of described 3rd lamp section LED3, LED in described 3rd lamp section LED3 is equally divided into two parts by quantity by the central point of described 3rd lamp section LED3, and namely the both sides of central point respectively include 2 LED；The annexation of other auxiliary switches is similar, does not repeat one by one at this.
As shown in Figure 4, the control signal of each auxiliary switch is together decided on by the control signal of the switching tube at two the adjacent lamps section two ends being connected with respectively this auxiliary switch, when the switching tube at next lamp section two ends turns off, when the switching tube at upper lamp section two ends turns on, this auxiliary switch turns on.
Specifically, in the present embodiment, each auxiliary switch is high-voltage tube (1 represents shutoff, 0 expression conducting), and the control signal of each auxiliary switch is Jx, satisfies conditionX is 1,2,3,4,5,6.When the control signal K7K6K5K4K3K2K1 of each switching tube is 0000001, described first switching tube Q1 turns off, described second switch pipe Q2 conducting, the control signal J1=0 of described first auxiliary switch Q1_1, i.e. described first auxiliary switch Q1_1 conducting；In described second lamp section LED2, Part II LED2_2 is in parallel with described first lamp section LED1 through described first auxiliary switch Q1_1, and in described second lamp section LED2, Part I LED2_1 two ends are that backward voltage does not turn on.Under similarity condition, in embodiment one, only described first lamp section LED1 can light, in the present embodiment, described first lamp section LED1 and in described second lamp section LED2 Part II LED2_2 all can light, improve LED utilization rate.Part II LED2_2～the LED6_2 of each lamp section all can realize in parallel thus increasing operation rate by that analogy.In the control signal of each switching tube from the change of 0000000 to 1111111, have a lot of probability and occur " ... 01 ... " combination, therefore the utilization rate of LED can be greatly improved.Owing to K1～K7 is a binary signal, therefore described ON-OFF control circuit 221 is internal can realize controlling conversion by simple digital circuit.
The present invention also provides for a kind of driving method based on above-mentioned linear LED drive circuit, and described driving method at least includes:
Input voltage VINAscent stage: open circuit, each switching tube is both turned on, input voltage VINRise, based on the described voltage controlling and driving module 22 to detect described current constant control pipe Q8 input, when the voltage of described current constant control pipe Q8 input is more than the first setting value VTH1Time, adjusting each switching tube and light the LED of respective numbers, the voltage of described current constant control pipe Q8 input declines；Described input voltage VINContinuing to rise, the voltage of described current constant control pipe Q8 input continues to rise, when the voltage of described current constant control pipe Q8 input is again more than described first setting value VTH1Time, again adjust each switching tube and light the LED of respective numbers；According to described input voltage VINChange be sequentially adjusted in each switching tube and light the LED of respective numbers, make the described current constant control pipe Q8 voltage born be not more than described first setting value VTH1。
Specifically, as in figure 2 it is shown, open circuit, each switching tube Q1～Q7 is both turned on, and each lamp section LED1～LED7 is all short-circuit, described voltage input module 21 output-input voltage VIN, described input voltage VINFor the commutating voltage after sinusoidal voltage rectification, it is the absolute value of sinusoidal voltage.Described input voltage VINBeginning to ramp up from 0V, the voltage of S1 end is detected by described ON-OFF control circuit 221, and the voltage of S1 end includes the voltage on described current constant control pipe Q8 and described sampling resistor RCSOn voltage, i.e. Vds+VCS.In the present embodiment, to adjust LED quantity 1, described first setting value VTH1For VLED+VREG.Along with described input voltage VINContinuous rising, the voltage of S1 end also constantly raises, and works as Vds+VCS>VTH1Time, it is 0000001 that described ON-OFF control circuit 221 exports the control signal K7K6K5K4K3K2K1 of each switching tube, and described first switching tube Q1 turns off, rest switch pipe still turns on, and described first lamp section LED1 is lit, and totally 1 LED is lit, the voltage of S1 end declines, Vds+VCS=VIN-VLED<VTH1, described current constant control pipe Q8 normal operation, constant current output；Described input voltage VINContinue to raise, when the voltage of S1 end is again more than described first setting value VTH1Time, it is 0000010 that described ON-OFF control circuit 221 exports the control signal K7K6K5K4K3K2K1 of each switching tube, and described second switch pipe Q2 turns off, rest switch pipe still turns on, and described second lamp section LED2 is lit, and totally 2 LED are lit, the voltage of S1 end declines, Vds+VCS=VIN-2*VLED<VTH1, described current constant control pipe Q8 normal operation, constant current output；Described input voltage VINContinue to raise, when the voltage of S1 end is again more than described first setting value VTH1Time, it is 0000011 that described ON-OFF control circuit 221 exports the control signal K7K6K5K4K3K2K1 of each switching tube, described first switching tube Q1 and described second switch pipe Q2 turns off, rest switch pipe still turns on, described first lamp section LED1 and described second lamp section LED2 is lit, totally 3 LED are lit, and the voltage of S1 end declines, Vds+VCS=VIN-3*VLED<VTH1, described current constant control pipe Q8 normal operation, constant current output；The like, increase by 1 LED every time and be lit.
Described first setting value VTH1Can set that as p*VLED+VREG, wherein, p is the LED quantity needing each time to adjust, can value 1,2,3,4 ..., shorten the time of response with this.
Specifically, as shown in Figure 4, open circuit, each switching tube Q1～Q7 is both turned on, and each lamp section LED1～LED7 is all short-circuit, and each auxiliary switch Q1_1～Q6_1 is turned off, described voltage input module 21 output-input voltage VIN.Described input voltage VINBeginning to ramp up from 0V, the voltage of S1 end is detected by described ON-OFF control circuit 221, and the voltage of S1 end includes the voltage on described current constant control pipe Q8 and described sampling resistor RCSOn voltage, i.e. Vds+VCS.In the present embodiment, described first setting value VTH1For VLED+VREG.Along with described input voltage VINContinuous rising, the voltage of S1 end also constantly raises, and works as Vds+VCS>VTH1Time, it is 0000001 that described ON-OFF control circuit 221 exports the control signal K7K6K5K4K3K2K1 of each switching tube, described first switching tube Q1 turns off, rest switch pipe still turns on, described first auxiliary switch Q1_1 conducting, all the other auxiliary switches are still off, described first lamp section LED1 is lit, in described second lamp section LED2, Part II LED2_2 is in parallel with described first lamp section LED1 and turn on through described first auxiliary switch Q1_1 simultaneously, and Part I LED2_1 two ends are that backward voltage does not turn in described second lamp section LED2, now totally 2 LED are lit, the voltage of S1 end declines, Vds+VCS=VIN-VLED<VTH1, described current constant control pipe Q8 normal operation, constant current output.At identical input voltage VINAnd same settings value VTH1When, the quantity of the LED lighted in circuit increases, and the utilization rate of LED is greatly improved.Only when the control signal Jx of auxiliary switch satisfies condition:The connection in series-parallel of LED can be realized when x is 1,2,3,4,5,6, improve the utilization rate of LED.
Input voltage VINDecline stage: as described input voltage VINDuring decline, based on the described voltage controlling and driving module 22 to detect described current constant control pipe Q8 input, when the voltage of described current constant control pipe Q8 input is less than the second setting value VTH2Time, adjusting each switching tube and extinguish the LED of respective numbers, the voltage of described current constant control pipe Q8 input rises；Described input voltage VINContinuing to decline, the voltage of described current constant control pipe Q8 input continues to decline, when the voltage of described current constant control pipe Q8 input is again less than described second setting value VTH2Time, again adjust respective switch pipe and extinguish the LED of respective numbers；Change V according to described input voltageINIt is sequentially adjusted in each switching tube and extinguishes the LED of respective numbers, make the voltage that described current constant control pipe bears be not less than described second setting value VTH2。
Specifically, as in figure 2 it is shown, each switching tube Q1～Q7 is turned off, each lamp section LED1～LED7 is all lit, described voltage input module 21 output-input voltage VIN, described input voltage VINFor the commutating voltage after sinusoidal voltage rectification, it is the absolute value of sinusoidal voltage.Described input voltage VINBeginning to decline from peak value, the voltage of S1 end is detected by described ON-OFF control circuit 221.In the present embodiment, to adjust LED quantity 1, described second setting value VTH2For VREG.Along with described input voltage VINContinuous decline, the voltage of S1 end also constantly declines, and works as Vds+VCS<VTH2Time, it is 1111110 that described ON-OFF control circuit 221 exports the control signal K7K6K5K4K3K2K1 of each switching tube, described first switching tube Q1 conducting, rest switch pipe is still off, and described first lamp section LED1 is off, and totally 126 LED are lit, the voltage of S1 end rises, Vds+VCS=VIN-126VLED>VTH2, described current constant control pipe Q8 normal operation, constant current output；Described input voltage VINContinue to decline, when the voltage of S1 end is again less than described second setting value VTH2Time, it is 1111101 that described ON-OFF control circuit 221 exports the control signal K7K6K5K4K3K2K1 of each switching tube, and described second switch pipe Q2 turns on, rest switch pipe turns off, and described second lamp section LED2 is off, and totally 125 LED are lit, the voltage of S1 end rises, Vds+VCS=VIN-125*VLED>VTH2, described current constant control pipe Q8 normal operation, constant current output；The like, increase by 1 LED every time and be off.
Specifically, as shown in Figure 4, each switching tube Q1～Q7 is turned off, and each lamp section LED1～LED7 is all lit, and each auxiliary switch Q1_1～Q6_1 is turned off, described voltage input module 21 output-input voltage VIN, described input voltage VINFor the commutating voltage after sinusoidal voltage rectification, it is the absolute value of sinusoidal voltage.Described input voltage VINBeginning to decline from peak value, the voltage of S1 end is detected by described ON-OFF control circuit 221.Along with described input voltage VINContinuous decline, the voltage of S1 end also constantly declines, and works as Vds+VCS<VTH2Time, it is 1111110 that described ON-OFF control circuit 221 exports the control signal K7K6K5K4K3K2K1 of each switching tube, described first switching tube Q1 conducting, rest switch pipe is still off, and described first lamp section LED1 is off, and totally 126 LED are lit, the voltage of S1 end rises, Vds+VCS=VIN-126VLED>VTH2, described current constant control pipe Q8 normal operation, constant current output；Described input voltage VINContinue to decline, when the voltage of S1 end is again less than described second setting value VTH2Time, it is 1111101 that described ON-OFF control circuit 221 exports the control signal K7K6K5K4K3K2K1 of each switching tube, described second switch pipe Q2 turns on, rest switch pipe turns off, described first auxiliary switch Q1_1 conducting, then described first lamp section LED1 and described 3rd lamp section LED3～the 7th lamp section LED7 is all lit, in described second lamp section LED2, Part II LED2_2 is in parallel with described first lamp section LED1 and turn on through described first auxiliary switch Q1_1, still 126 LED are had to be lit, the voltage of S1 end rises, Vds+VCS=VIN-126*VLED>VTH2, described current constant control pipe Q8 normal operation, constant current output.At identical input voltage VINAnd same settings value VTH1When, the quantity of the LED lighted in circuit increases, and the utilization rate of LED is greatly improved.Only when the control signal Jx of auxiliary switch satisfies condition:The connection in series-parallel of LED can be realized when x is 1,2,3,4,5,6, improve the utilization rate of LED.
The linear LED drive circuit of the present invention and method adopt injectron in parallel with controlled LED, are all cascaded during all LED operation, and by the adjustment management and control electric current of bottom, part LED optionally can be shorted out by internal control circuit when adjusting；LED adopts binary number purpose segmented mode, carry out dynamic LED and turn on quantity control, making each LED number that can adjust LED when switching is minimum (1 LED), thus realizing LED in whole input voltage range to turn on the adjustment of quantity and high delivery efficiency；Current constant control pipe can do dynamic internal algorithm adjustment according to the actual voltage undertaken, and improves the response speed to input voltage；When adjusting LED number, electric currents at different levels can pass through internal simple algorithm, it is achieved the several functions such as constant current, invariable power；The linear LED drive circuit of the present invention and method can realize High Power Factor and the low harmonic current of whole voltage range；Also can effectively improve intermodulation distortion during input voltage zero passage, increase the angle of flow；The structure in parallel by specific LED strip can improve LED utilization rate.
In sum, the present invention provides a kind of linear LED drive circuit, including: the voltage input module of input voltage is provided；Being connected to the LED string of described voltage input module, as load, described LED string is with binary number segmentation；It is parallel to the switching tube of each lamp section, for being realized the adjustment of the LED quantity being lit in described LED string by the turn-on and turn-off of each switching tube；It is connected to the current constant control pipe of the outfan of described LED string, is used for regulating electric current and realizes constant current output；It is connected to the sampling resistor of described current constant control pipe, is used for converting electrical current into sampled voltage；The control being connected to described current constant control pipe two ends drives module, for detecting described LED string outfan and the voltage of described current constant control pipe outfan, and exports each switching tube and the control signal of described current constant control pipe.The linear LED driving method of the present invention adjusts the quantity of the LED being lit by detecting the voltage of current constant control pipe input, reduce the voltage on described current constant control pipe with this, in whole input voltage range, realize high delivery efficiency, High Power Factor and low input harmonics；Utilization rate also by the connection in series-parallel raising LED of LED.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment is illustrative principles of the invention and effect thereof only, not for the restriction present invention.Above-described embodiment all under the spirit and category of the present invention, can be modified or change by any those skilled in the art.Therefore, art has usually intellectual such as modifying without departing from all equivalences completed under disclosed spirit and technological thought or change, must be contained by the claim of the present invention.
Claims (11)
1. a linear LED drive circuit, it is characterised in that described linear LED drive circuit at least includes:
Voltage input module, is used for providing input voltage；
LED string, is connected to described voltage input module, and described LED string includes first quantity n lamp section, and each lamp section is connected in series, and in each lamp section, the quantity of LED is that binary system increases；
First quantity n switching tube, each paralleled power switches is in each lamp section, for being realized the adjustment of the LED quantity being lit in described LED string by the turn-on and turn-off of each switching tube；
Current constant control pipe, is connected to the outfan of described LED string, is used for regulating electric current and realizes constant current output；
Sampling resistor, for being converted to sampled voltage by the electric current that described current constant control pipe exports；
Control to drive module, be connected to the two ends of described current constant control pipe, for detecting described LED string outfan and the voltage of described current constant control pipe outfan, and export each switching tube and the control signal of described current constant control pipe.
2. linear LED drive circuit according to claim 1, it is characterised in that: each lamp section is sequentially connected with, and in each lamp section, the quantity of LED raises with current potential and is incremented by, and the quantity comprising LED in kth lamp section is 2k-1, wherein, 1≤k≤n.
3. linear LED drive circuit according to claim 2, it is characterized in that: also include the second quantity (n-1) individual auxiliary switch, one end of each auxiliary switch connects the outfan of each lamp section, the other end connects the central point of a upper lamp section, and the LED number in this lamp section is divided equally by each lamp section central point.
4. linear LED drive circuit according to claim 3, it is characterized in that: the control signal of each auxiliary switch is together decided on by the control signal of the switching tube at two the adjacent lamps section two ends being connected with respectively this auxiliary switch, when the switching tube at next lamp section two ends turns off, when the switching tube at upper lamp section two ends turns on, this auxiliary switch turns on.
5. linear LED drive circuit according to claim 1, it is characterized in that: described control drives module to include ON-OFF control circuit and comparison circuit, the input of described ON-OFF control circuit is connected between described LED string and described current constant control pipe, and the control signal exporting each switching tube according to the voltage detected is lit with the LED realizing varying number；Described comparison circuit is connected between described current constant control pipe and described sampling resistor, is compared with reference voltage by the sampled voltage between described current constant control pipe and described sampling resistor, and exports the control voltage of described current constant control pipe to regulate current constant.
6. linear LED drive circuit according to claim 5, it is characterised in that: the reverse input end of described comparison circuit connects described sampled voltage, positive input connects described reference voltage.
7. linear LED drive circuit according to claim 5, it is characterised in that: described reference voltage is provided by described ON-OFF control circuit.
8. the driving method of the linear LED drive circuit as described in claim 1～7 any one, it is characterised in that described driving method at least includes:
The ascent stage of described input voltage: open circuit, each switching tube is both turned on, described input voltage rises, based on the described voltage controlling and driving module to detect described current constant control pipe input, when the voltage of described current constant control pipe input is more than the first setting value, adjusting each switching tube and light the LED of respective numbers, the voltage of described current constant control pipe input declines；Described input voltage continues to rise, and the voltage of described current constant control pipe input continues to rise, and when the voltage of described current constant control pipe input is again more than described first setting value, again adjusts each switching tube and lights the LED of respective numbers；Change according to described input voltage is sequentially adjusted in each switching tube and lights the LED of respective numbers, makes the voltage that described current constant control pipe bears be not more than described first setting value；Minimum adjustable LED quantity is 1 LED；
The decline stage of described input voltage: described input voltage declines, based on the described voltage controlling and driving module to detect described current constant control pipe input, when the voltage of described current constant control pipe input is less than the second setting value, adjusting each switching tube and extinguish the LED of respective numbers, the voltage of described current constant control pipe input rises；Described input voltage continues to decline, and the voltage of described current constant control pipe input continues to decline, and when the voltage of described current constant control pipe input is again less than described second setting value, again adjusts each switching tube and extinguishes the LED of respective numbers；Change according to described input voltage is sequentially adjusted in each switching tube and extinguishes the LED of respective numbers, makes the voltage that described current constant control pipe bears be not less than described second setting value；Minimum adjustable LED quantity is 1 LED.
9. linear LED driving method according to claim 8, it is characterised in that: a described setting value is VLED+VREG, described second setting value is VREG, wherein, VLEDFor single led forward conduction voltage drop, VREGDescribed current constant control pipe and the minimum voltage sum on described sampling resistor during for described current constant control pipe normal operation.
10. linear LED driving method according to claim 8, it is characterized in that: when in two the adjacent lamps sections being connected with each auxiliary switch, the switching tube at next lamp section two ends turns off, when the switching tube at upper lamp section two ends turns on, this auxiliary switch turns on, the connection in series-parallel of LED can be realized, when identical input voltage, improve the utilization rate of LED.
11. linear LED driving method according to claim 8, it is characterised in that: the control signal of described input voltage and each switching tube has one-to-one relationship, can utilize this relation that electric current is individually controlled, to realize constant power output within the scope of certain voltage.
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