CN103582263A - Linear multi-channel LED constant-current drive circuit - Google Patents
Linear multi-channel LED constant-current drive circuit Download PDFInfo
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Abstract
The invention provides a linear multi-channel LED constant-current drive circuit. The linear multi-channel LED constant-current drive circuit comprises a voltage input module, an LED module, a plurality of power tubes, a multi-channel current detection module, a constant current control module and a channel selector at least. The LED module is connected to the voltage input module; each level of LED strips are connected with one power tube, and constant current is achieved by adjusting the current of each power tube; the multi-channel current detection module is connected with each power tube and used for detecting the current of each level of LED strips; the constant current control module is connected with the multi-channel current detection module and used for adjusting the output of the power tubes to make the current constant; the channel selector is connected with the multi-channel current detection module. The forward-direction driving voltage VF of the LED strips will not be limited by preset design requirements for chips any more, larger application design flexibility can be achieved, waveform deformation caused by switching motion of adjacent switches is avoided, and simple, effective and direct control can be better achieved.
Description
Technical field
The present invention relates to LED Drive Control Technique field, particularly relate to a kind of Linear Multi-channel LED constant-current drive circuit.
Background technology
LED is the luminous semi-conductor electricity sub-element of a kind of energy, and this electronic component can only send the ruddiness of low luminosity in early days, along with the continuous progress of technology, has developed into now and can send visible ray, infrared ray and ultraviolet degree, and luminosity is also greatly improved.LED has advantages of that efficiency is high, the life-span is long, the conventional light source such as high, the high reliability of cracky, switching speed is not too late, has been widely used in indicator light, display and lighting field.
Due to the one-way conduction characteristic of LED, while adding reverse voltage at LED two ends, LED lamp in reverse dead band, can not be luminous; When reverse voltage is excessive, LED is in reverse breakdown district, and LED lantern festival is damaged even burns, scraps; When LED two ends slowly add forward voltage, when voltage is very little, LED can't conducting work; When additional forward voltage is greater than the positive drive voltage VF of LED, LED starts conducting, and electric current increases linear increase with voltage; Continue to increase additional forward voltage, curent change is now very violent; When additional forward voltage reaches the positive drive voltage VF of LED, the result of use of LED is best, so need to make LED diode operation under stable state by a constant-current control circuit, guarantees that LED the most effectively works.When input voltage is during higher than the positive drive voltage VF of LED, generally can adopt so-called Buck reduction voltage circuit that voltage is down to consistent with the positive drive voltage VF of LED; Otherwise, when input voltage is lower than the driving voltage VF of LED time, must adopt Boost booster circuit that voltage is risen to consistent with the positive drive voltage VF of LED, thereby realize normal constant current control work.But step-up/step-down circuit (Boost/Buck) is by inductance, and the energy storage devices such as electric capacity form, and account for chip area large, are unfavorable for the integrated of circuit.Multichannel linearity control circuit on the other side becomes in recent years a new direction in the drive integrated circult development of LED, multichannel linearity control circuit is under electric main initial conditions, to control a simple and effective drive scheme of LED illumination, utilize a series of switching circuits that the LED lamp pearl of series connection is connected piecemeal or closed, positive drive voltage and the input AC line voltage of the LED lamp string of series connection are matched, the linear constant current that adds circuit is controlled, thereby meet the control requirement of the constant current illumination of LED, lamplight brightness is also more even.
In order to make switch can effectively control the positive drive voltage of the LED lamp string of series connection, itself and input voltage are matched, the control program adopting at present has following two kinds:
1) waveform of inputting sinusoidal voltage by monitoring carrys out the logic of driving switch.
As shown in Figure 1, when input voltage rises to the positive drive voltage VF1 that is greater than first paragraph LED, open first passage power tube M1, multi channel currents detection module 13 and constant-current control circuit 12 are started working, and make first paragraph LED realize constant current work; When voltage continues to rise to the LED positive drive voltage summation VF1+VF2 that is greater than first, second section, open the channel power pipe M2 of second segment, outer detecting circuit is input to comparator and channel to channel adapter 11 by LN port by external control signal simultaneously, open lower trombone slide M11, close the power tube M1 of first paragraph, and open corresponding constant-current control circuit 12 and make the LED of two sections of series connection realize constant current work; The rest may be inferred, until input voltage rises to, approaches peak value, and last power tube is connected the LED of all series connection, closes other passages simultaneously, thereby make all LED lamp strings all be operated in constant current state.When input ac voltage adopts a reverse logic control to make channel switch pipe close successively and open when sinusoidal peak value declines, thereby make positive drive voltage value on LED lamp string all the time lower than input voltage, to realize directly actuated object.
2) by monitoring, input the logic of the time cycle driving switch of sinusoidal voltage.
As shown in Figure 2, because electric main is according to sinusoidal wave work pattern, determine temporal frequency, the cycle of input voltage, can calculate input voltage according to simple sine formula.Adopt timing cycle open and close to control the switch of LED series block, city's magnitude of voltage of input and the positive drive voltage of LED are matched, also can realize directly actuated object.The circuit of controlling at times need to have an external detection circuit, detected value is sent into input signal cycle sampling module 21, frequency multiplier 22 and channel to channel adapter 23 successively by port LN to be processed, come the frequency and the cycle that are worth to determine input voltage zero point of test input voltage, and in conjunction with constant-current control module 24 and multi channel currents detection module 25, control open and close time of corresponding power pipes, to realize the control of series connection coupling.
But no matter be 1) detect the Waveform Control or 2 of voltage) the detection frequency of input voltage is, the control in cycle, all need be realized by an external testing circuit, at least on control chip, will have a special-purpose pin to input the signal of this external detection circuit; In addition, in the situation that the falsification of LED lamp becomes, will be by regulating non-essential resistance change outside control signal, corresponding with the positive drive voltage of default LED lamp string to realize time of switch conduction and corresponding input voltage thereof, this is the basic restriction of current this type of control chip.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of Linear Multi-channel LED constant-current drive circuit, for solving prior art, need realize the problem that input voltage mates with LED positive drive voltage by an external testing circuit.
For achieving the above object and other relevant objects, the invention provides a kind of Linear Multi-channel LED constant-current drive circuit, it is characterized in that, described Linear Multi-channel LED constant-current drive circuit at least comprises:
Voltage input module, for providing input adjustable voltage;
LED module, is connected in described voltage input module, comprises multi-stage LED lamp string;
A plurality of power tubes, LED lamp strings at different levels are respectively connected with a power tube, by regulating the size of current of each power tube to realize the constant current of LED lamp strings at different levels;
Multi channel currents detection module, is connected with this power tube respectively, for detecting by this power tube respectively the size of current that flows through LED lamp strings at different levels;
Constant-current control module, is connected with described multi channel currents detection module, regulates the output of described power tube, to realize the constant of electric current for the size of current detecting according to described multi channel currents detection module;
Channel to channel adapter, be connected with described multi channel currents detection module, the size of current of the next stage LED lamp string detecting according to described multi channel currents detection module is carried out conducting or is turn-offed when the drop-down pipe of prime, thereby controls conducting and the shutoff when the corresponding power tube of prime LED lamp string.
Preferably, the voltage of described Voltage-output module output is for increasing continuously or reducing continuously.
Preferably, the voltage of described Voltage-output module output is the commutating voltage after sinusoidal voltage rectification.
Preferably, described Voltage-output module comprises an AC power and a rectification unit, described rectification unit comprises two groups of diode groups in parallel, and each diode group comprises two diodes of series connection, and the two poles of the earth of described AC power are connected between two diodes of each diode group.
Preferably, described LED module comprises a plurality of LED lamp strings that connect successively, and wherein, first order LED consists of the first string LED lamp string, and second level LED consists of adjacent front two string LED lamp strings, and the rest may be inferred forms LED at different levels.
Preferably, described multi channel currents detection module is controlled respectively described channel to channel adapter by multiple signals independently.
Preferably, described constant-current control module is linear regulation circuit.
Preferably, described lower trombone slide and described power tube match in groups one by one, and respectively organize separate.
Preferably, described multi channel currents detection module is connected with same outer meeting resistance with described constant-current control module.
As mentioned above, a kind of Linear Multi-channel LED constant-current drive circuit of the present invention, has following beneficial effect:
1) do not need extra external detection circuit, by inner current detecting, feed back to realize mating of input voltage and LED positive drive voltage.
2), when the falsification of LED lamp becomes, do not need non-essential resistance regulate and change and can devote oneself to work.
Accompanying drawing explanation
Fig. 1 is shown as the LED constant-current drive circuit schematic diagram of prior art 1.
Fig. 2 is shown as the LED constant-current drive circuit schematic diagram of prior art 2.
Fig. 3 is shown as Linear Multi-channel LED constant-current drive circuit schematic diagram of the present invention.
Fig. 4 is shown as the current waveform schematic diagram that flows through power tubes at different levels and each time trombone slide gate voltage waveform view of Linear Multi-channel LED constant-current drive circuit of the present invention.
Element numbers explanation
The LED constant-current drive circuit of 1 prior art 1
11 comparators and channel to channel adapter
12 constant-current control modules
13 multi channel currents detection modules
The LED constant-current drive circuit of 2 prior aries 2
21 input signal cycle sampling modules
22 frequency multipliers
23 channel to channel adapters
24 constant-current control modules
25 multi channel currents detection modules
3 Linear Multi-channel LED constant-current drive circuits of the present invention
31 channel to channel adapters
32 constant-current control modules
33 multi channel currents detection modules
34 LED lamp strings
341 first string LED lamp strings
342 second string LED lamp strings
343 the 3rd string LED lamp strings
344 the 4th string LED lamp strings
35 voltage input modules
Embodiment
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can understand other advantages of the present invention and effect easily by the disclosed content of this specification.The present invention can also be implemented or be applied by other different embodiment, and the every details in this specification also can be based on different viewpoints and application, carries out various modifications or change not deviating under spirit of the present invention.
Refer to Fig. 3 to Fig. 4.It should be noted that, the diagram providing in the present embodiment only illustrates basic conception of the present invention in a schematic way, satisfy and only show with assembly relevant in the present invention in graphic but not component count, shape and size drafting while implementing according to reality, during its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly layout kenel also may be more complicated.
As shown in Figure 3, the invention provides a kind of Linear Multi-channel LED constant-current drive circuit.Described Linear Multi-channel LED constant-current drive circuit 3 at least comprises: voltage input module 35, for input adjustable voltage VIN is provided; LED module 34, is connected in described voltage input module 35, comprises multi-stage LED lamp string; A plurality of power tube M1～M4, LED lamp strings at different levels are respectively connected with a power tube, by regulating the size of current of each power tube to realize the constant current of LED lamp strings at different levels; Multi channel currents detection module 33, is connected with this power tube respectively, for detecting by this power tube respectively the size of current that flows through LED lamp strings at different levels; Constant-current control module 32, is connected with described multi channel currents detection module 33, regulates the output of described power tube, to realize the constant of electric current for the size of current detecting according to described multi channel currents detection module 33; And channel to channel adapter 31, be connected with described multi channel currents detection module 33, the size of current of the next stage LED lamp string detecting according to described multi channel currents detection module 33 is carried out conducting or is turn-offed when the drop-down pipe of prime, thereby controls conducting and the shutoff when the corresponding power tube of prime LED lamp string.
Described Voltage-output module 35, it comprises an AC power AC and a rectification unit, described rectification unit comprises two groups of diode groups in parallel, each diode group comprises two diodes of series connection, the two poles of the earth of described AC power are connected between two diodes of each diode group, and the voltage VIN of described Voltage-output module 35 outputs is the commutating voltage after the continuous sinusoidal voltage rectification that increases or reduce continuously.
Described LED module 34, comprises a plurality of LED lamp strings that connect successively, and wherein, first order LED consists of the first string LED lamp string, and second level LED consists of adjacent front two string LED lamp strings, and the rest may be inferred forms LED at different levels.In the present embodiment, described LED module has 4 groups of LED lamp strings 341～344.Accordingly, described power tube is 4, is connected respectively with LED lamp strings at different levels, and as example, described power tube is NMOS pipe.
In the present embodiment, described constant-current control module 32 is linear regulation circuit; Described constant-current control module 32 is connected with same outer meeting resistance with described multi channel currents detection module 33.
Described multi channel currents detection module 33, it controls respectively described channel to channel adapter 31 by multiple signals independently.
In the present embodiment, described lower trombone slide and described power tube match in groups one by one, and respectively organize separate.
The operation principle of above-mentioned Linear Multi-channel LED constant-current drive circuit 3 is as follows:
As shown in Figures 3 and 4, after the rectification of alternating voltage by diode, export, it is one-period that output waveform be take front half period of sine wave, according to LED lamp string, sets outer meeting resistance Rcs and is connected in port CS to determine constant current value Iset.
After chip enable, internal power source voltage normal operation, power tube M1, M2, M3 and M4 acquiescence are in conducting state.Input voltage VIN rises since 0, because power tube M1～M4 gives tacit consent to conducting, when input voltage VIN is greater than the positive drive voltage VF1 of LED lamp string 341, when namely the voltage at port VD1 place starts to be greater than 0V, in power tube M1, start current flowing, and the electric current I d_M1 that flows through power tube M1 increases constantly and increases with voltage, and this electric current I d_M1 is connected to ground by multi channel currents detection module 33 and outer meeting resistance Rcs successively.The gate voltage that the current value that constant-current control module 32 starts to detect according to multi channel currents detection module 33 is simultaneously adjusted M1 makes the electric current I d_M1 that flows through power tube M1 be constant at set point Iset place.Although power tube M1～M4 gives tacit consent to conductings, due to the existence of LED lamp string 342,343,344, when the voltage at port VD1 place is less than the positive drive voltage VF2 of LED lamp string 342, power tube M2, M3 and M4, by M1 short circuit, do not have electric current to flow through.Now, first order LED realizes constant current.
Input voltage VIN continue to rise, but the voltage at port VD1 place is while being still less than the positive drive voltage VF2 of LED lamp string 342, and electric current is only by LED lamp string 341, and constant flow module regulating power pipe M1, makes Id_M1 keep constant, the 341 maintenance constant currents of LED lamp string, when the continuous rising of input voltage VIN makes the voltage at port VD2 place be greater than 0, because power tube M2 gives tacit consent to conducting, unnecessary electric current starts to flow through power tube M2, and the electric current I d_M2 that flows through power tube M2 increases with the continuous increase of voltage, when multi channel currents detection module 33 detects Id_M2 and reaches reference current value Iref_up, multi channel currents detection module 33 send a road independently internal control signal make channel to channel adapter 31 first be output as high signal, in the present embodiment, high signal sets is 5V, descend the gate voltage Vg_M11 of trombone slide M11 to uprise, lower trombone slide M11 conducting, thereby the gate voltage of power tube M1 is set to 0, power tube M1 turn-offs, Id_M1 drops to 0.When input voltage VIN is greater than the positive drive voltage sum VF1+VF2 of LED lamp string 341 and LED lamp string 342, LED lamp string 341 and LED lamp string 342 light simultaneously, the electric current that flows through LED lamp string 341 and 342 arrives ground by multi channel currents testing circuit 33 and outer meeting resistance Rcs, and the gate voltage of the current value Modulating Power pipe M2 that constant-current control module 32 beginnings simultaneously detect according to multi channel currents detection module 33 makes the electric current I d_M2 that flows through power tube M2 be constant at set point Iset place.Now, second level LED realizes constant current.
When input voltage VIN continues to rise, power tube M3 and M4 are equally by above principle work.When input voltage VIN reaches crest voltage, power tube M1, M2 and M3 now have closed, and four string LED lamps light simultaneously, and electric current flows through power tube M4, and is constant at set point Iset place, and now fourth stage LED completes constant current.
When input voltage VIN starts to decline from crest voltage, and input voltage VIN is while being less than VF1+VF2+VF3+VF4, and the electric current of Id_M4 starts to decline from Iset.When multi channel currents detection module 33 detects Id_M4 and is less than reference value Iref_dn, multi channel currents detection module 33 send a road independently internal control signal make the 3rd output signal of channel to channel adapter by high step-down, in the present embodiment, low signal is set as the value close to 0V, descend the gate voltage Vg_M33 step-down of trombone slide M33, lower trombone slide M33 closes, thereby by power tube M3 conducting, the gate voltage that the current value that constant-current control module 32 starts to detect according to multi channel currents detection module 33 is simultaneously adjusted M3 makes the electric current I d_M3 that flows through power tube M3 be constant at set point Iset place, now LED string 341, 342 and 343 light simultaneously, electric current flows through power tube M3 and is constant at set point Iset place, third level LED completes constant current.
When input voltage VIN continues to decline, switching tube M1 and M2 also can be according to above principle work.When input voltage VIN drops to the positive drive voltage of LED lamp string 341 when following, whole LED lamp string 34 has all extinguished, and does not have electric current to flow through LED and power tube.
That single cycle 10ms is to flow through current waveform schematic diagram and each time trombone slide gate voltage waveform view of power tubes at different levels in the interior course of work as shown in Figure 4, other time is the work in this cycle of repetition, as shown in Figure 4, the envelope of the electric current that flows through power tubes at different levels on time shaft is the straight line that value is set point.
In sum, Linear Multi-channel LED constant-current drive circuit of the present invention is a kind of novel built-in intelligent high-pressure Linear Multi-channel LED constant-current drive circuit, adopt different control thoughts to realize control and the constant current work of switch, by detecting the electric current of LED lamp string, and with the current information detecting as controlling foundation, control the logic of the opening and closing of corresponding tandem tap and control to realize the constant current of LED lamp string.Power tube is acquiescence conducting at the beginning, and when input voltage rises, while surpassing the positive drive voltage VF of corresponding LED lamp string, control circuit, according to the On current size of power tube, cuts out the power tube of upper level automatically; Otherwise when input voltage declines, during lower than the positive drive voltage VF of corresponding LED lamp string, control circuit, according to the On current size of power tube, is opened the power tube of upper level automatically.Do not need extra external detection circuit, by inner current detecting feedback, can realize mating of input voltage and LED positive drive voltage VF; Certainly, when the falsification of LED lamp becomes, also saved and need to regulate and change the trouble that just can devote oneself to work to outer detecting circuit.The positive drive voltage VF of Linear Multi-channel LED lamp string of the present invention will be limited by the preset requirement of chip design no longer, can there is larger application design flexibility to user, simultaneously such control logic also can be avoided the waveform sudden change that the switching action of adjacent control switch brings, realize tandem tap seamlessly transitting under high pressure, more preferably realize simple and effectively directly control.So the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all can, under spirit of the present invention and category, modify or change above-described embodiment.Therefore, such as in affiliated technical field, have and conventionally know that the knowledgeable, not departing from all equivalence modifications that complete under disclosed spirit and technological thought or changing, must be contained by claim of the present invention.
Claims (9)
1. a Linear Multi-channel LED constant-current drive circuit, is characterized in that, described Linear Multi-channel LED constant-current drive circuit at least comprises:
Voltage input module, for providing input adjustable voltage;
LED module, is connected in described voltage input module, comprises multi-stage LED lamp string;
A plurality of power tubes, LED lamp strings at different levels are respectively connected with a power tube, by regulating the size of current of each power tube to realize the constant current of LED lamp strings at different levels;
Multi channel currents detection module, is connected with this power tube respectively, for detecting by this power tube respectively the size of current that flows through LED lamp strings at different levels;
Constant-current control module, is connected with described multi channel currents detection module, regulates the output of described power tube, to realize the constant of electric current for the size of current detecting according to described multi channel currents detection module;
Channel to channel adapter, be connected with described multi channel currents detection module, the size of current of the next stage LED lamp string detecting according to described multi channel currents detection module is carried out conducting or is turn-offed when the drop-down pipe of prime, thereby controls conducting and the shutoff when the corresponding power tube of prime LED lamp string.
2. Linear Multi-channel LED constant-current drive circuit according to claim 1, is characterized in that: the voltage of described Voltage-output module output is for increasing continuously or reducing continuously.
3. Linear Multi-channel LED constant-current drive circuit according to claim 1, is characterized in that: the voltage of described Voltage-output module output is the commutating voltage after sinusoidal voltage rectification.
4. Linear Multi-channel LED constant-current drive circuit according to claim 3, it is characterized in that: described Voltage-output module comprises an AC power and a rectification unit, described rectification unit comprises two groups of diode groups in parallel, each diode group comprises two diodes of series connection, and the two poles of the earth of described AC power are connected between two diodes of each diode group.
5. Linear Multi-channel LED constant-current drive circuit according to claim 1, it is characterized in that: described LED module comprises a plurality of LED lamp strings that connect successively, wherein, first order LED consists of the first string LED lamp string, second level LED consists of adjacent front two string LED lamp strings, and the rest may be inferred forms LED at different levels.
6. Linear Multi-channel LED constant-current drive circuit according to claim 1, is characterized in that: described multi channel currents detection module is controlled respectively described channel to channel adapter by multiple signals independently.
7. Linear Multi-channel LED constant-current drive circuit according to claim 1, is characterized in that: described constant-current control module is linear regulation circuit.
8. Linear Multi-channel LED constant-current drive circuit according to claim 1, is characterized in that: described lower trombone slide and described power tube match in groups one by one, and respectively organize separate.
9. Linear Multi-channel LED constant-current drive circuit according to claim 1, is characterized in that: described multi channel currents detection module is connected with same outer meeting resistance with described constant-current control module.
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| CN108198527B (en) * | 2017-12-15 | 2020-06-09 | 京东方科技集团股份有限公司 | Sampling method, sampling control method, sampling device and sampling control system |
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| CN111405710A (en) * | 2020-02-21 | 2020-07-10 | 鹰潭阳光照明有限公司 | Intelligence L ED lamp circuit |
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