CN102858057A - A current sharing system used to control the current of each branch of the LED lamp circuit - Google Patents
A current sharing system used to control the current of each branch of the LED lamp circuit Download PDFInfo
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- CN102858057A CN102858057A CN2012102839337A CN201210283933A CN102858057A CN 102858057 A CN102858057 A CN 102858057A CN 2012102839337 A CN2012102839337 A CN 2012102839337A CN 201210283933 A CN201210283933 A CN 201210283933A CN 102858057 A CN102858057 A CN 102858057A
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Abstract
The invention relates to the technical field of current sharing of LED lamp circuits, in particular to a current sharing system for controlling current of each branch of an LED lamp circuit, wherein each LED lamp branch is provided with a corresponding constant current control chip, each constant current control chip comprises a first unit for generating reference current and a second unit for controlling the current of the LED lamp branch, and the control output end of the first unit is connected with the control input end of the second unit, so that the first unit controls the current of the LED lamp branch through the second unit according to the reference current generated by the first unit; from the first constant current control chip to the last constant current control chip, the first cells of all the constant current control chips are connected in series in sequence. The invention can realize the high-precision current equality among a plurality of constant current control chips, and the difference of the resistance and the tube among different constant current control chips has no influence on the current equality of each LED lamp branch; moreover, the expandability is strong.
Description
Technical field
The present invention relates to LED circuit for lamp flow equalize technology field, relate in particular to a kind of current-equalizing system for each branch current of control LED circuit for lamp.
Background technology
The LED(light-emitting diode) the V-I(voltage-to-current of lamp) characteristic curve is similar to the V-I characteristic curve of diode, and electric current is pressed voltage index and changed, change in voltage a bit, curent change is very large.In the LED circuit for lamp; all LED lamp series connection; electric current must equate; but need higher supply voltage, so, when the more LED lamp of needs; LED lamp in the LED circuit for lamp can adopt the rear mode in parallel of first series connection usually; and each branch road of this LED circuit for lamp owing to certainly exist difference between the LED lamp, generally all needs to adopt the system of current-sharing to control each branch current when parallel connection.Because when adopting current-equalizing system, can use the large LED lamp of V-I characteristic difference, need not to buy the LED lamp through the screening grouping, and when brightness was low, human eye was very responsive, so the consistency of current-sharing is more high better.
At present, the current-equalizing system that is used for each branch current of control LED circuit for lamp mainly contains following several: 1, as shown in Figure 1, single-chip multi-path flow equalizing system, but, single-chip multi-path flow equalizing system exists the shortcoming such as is inconvenient to expand, and when a way of the LED lamp that needs is not the integral multiple of chip channel number, must waste some passages; 2, as shown in Figure 2, fixing constant-current system, each branch road of its LED circuit for lamp relies on constant current chip to realize current constant, constant current chip commonly used has current regulator diode and other constant currents IC, but this fixedly constant-current system is not current-equalizing system in essence, because the electric current consistency between its a plurality of constant current chips, also be the difference that depends between constant current chip, namely the difference of the components and parts such as resistance between constant current chip can affect the electric current consistency of each branch road; 3, the variable constant-current system of electric current, it has several types: as shown in Figure 3, by the constant current scheme one of digital communication interface adjusting; The constant current scheme two of regulating by digital communication interface as shown in Figure 4; The constant current scheme three of regulating by the PWM mode as shown in Figure 5; These systems are the same with above-mentioned fixedly constant-current system, each branch road relies on constant current chip to realize current constant, not current-equalizing system in essence, just increase interface circuit and realized the electric current adjusting, so, this by the constant-current system of digital communication interface adjusting or the constant-current system of regulating by the PWM mode, the electric current consistency between its a plurality of constant current chips, also be the difference that depends between constant current chip, namely the difference of the components and parts such as resistance between constant current chip can affect the electric current consistency of each branch road.
Summary of the invention
The object of the invention is to provide for the deficiencies in the prior art the current-equalizing system that is used for each branch current of control LED circuit for lamp that a kind of extensibility is strong, can realize the high-precision current coupling between multi-chip.
Purpose of the present invention realizes by following technical measures: a kind of current-equalizing system for each branch current of control LED circuit for lamp, each the LED lamp branch road that comprises the parallel connection of LED circuit for lamp, also comprise the constant current control chip corresponding with described each LED lamp branch road, described each constant current control chip includes the first module for generation of reference current, the second unit that is used for control LED lamp branch current, the control output end of described first module is connected with the control input end of described second unit, makes described first module control described LED lamp branch current according to the reference current that self produces by described second unit; The input of described LED lamp branch road is connected with circuit power, and the output of described LED lamp branch road is connected with the current input terminal of described second unit, the current output terminal ground connection of described second unit; From first constant current control chip to last constant current control chip, the first module of all constant current control chips is connected in series successively; Described first constant current control chip is arranged to the Marst(holotype) pattern, be used for the generating reference electric current; Remaining constant current control chip is arranged to Slave(from pattern) pattern, make describedly to be equal to the reference current that described first constant current control chip generates for the reference current from the first module of the constant current control chip of pattern.
The second unit of described constant current control chip comprises the 3rd resistance, the 4th resistance, the first field effect transistor, the second field effect transistor, the 3rd field effect transistor, the 4th field effect transistor, internal current source, the first operational amplifier, the grid of described the first field effect transistor is the control input end of described second unit, the source electrode of described the first field effect transistor is connected with chip power, the drain electrode of described the first field effect transistor is connected with the drain electrode of described the second field effect transistor, the grid of described the second field effect transistor is arranged to the Slave pattern, one end of the source electrode of described the second field effect transistor and described the 3rd resistance, the source electrode of described the 3rd field effect transistor, the in-phase input end of described the first operational amplifier connects, the other end ground connection of described the 3rd resistance, the grid of described the 3rd field effect transistor is arranged to the Marst pattern, the drain electrode of described the 3rd field effect transistor is connected with chip power by described internal current source, the source electrode of the inverting input of described the first operational amplifier and described the 4th field effect transistor, one end of described the 4th resistance connects, the grid of described the 4th field effect transistor is connected with the output of described the first operational amplifier, the drain electrode of described the 4th field effect transistor is the current input terminal of described second unit, and the other end of described the 4th resistance is the current output terminal of described second unit.
The first module of described constant current control chip comprises the first resistance, the second resistance, the 5th field effect transistor, the 6th field effect transistor, the 7th field effect transistor, the second operational amplifier, the 3rd operational amplifier, one end of described the first resistance is the current input terminal of first module, and an end of described the first resistance is connected with the in-phase input end of described the second operational amplifier, the other end of described the first resistance is the current output terminal of first module, and the other end of described the first resistance is connected with the in-phase input end of described the 3rd operational amplifier, one end of the inverting input of described the second operational amplifier and described the second resistance, the source electrode of described the 6th field effect transistor connects, the grid of described the 6th field effect transistor is connected with the output of described the second operational amplifier, the drain electrode of the drain electrode of described the 6th field effect transistor and described the 5th field effect transistor, the grid of described the 5th field effect transistor connects, and the grid of described the 5th field effect transistor is the control output end of described first module, the source electrode of described the 5th field effect transistor is connected with chip power, the other end of the inverting input of described the 3rd operational amplifier and described the second resistance, the source electrode of described the 7th field effect transistor connects, the grid of described the 7th field effect transistor is connected with the output of described the 3rd operational amplifier, the grounded drain of described the 7th field effect transistor.
As another embodiment, the first module of described constant current control chip comprises the first resistance, the second resistance, be used for calculating the digital circuit of difference of the voltage drop of described the first resistance and the second resistance, be used for adjusting the control circuit that flows through described the second resistor current, one end of described the first resistance is the current input terminal of first module, the other end of described the first resistance is the current output terminal of first module, an and end of described the first resistance, the other end of described the first resistance all is connected with the first sampling input of described digital circuit, one end of described the second resistance, the other end of described the second resistance all is connected with the second sampling input of described digital circuit, and an end of described the second resistance is connected with the output of described control circuit, the output of described control circuit is the control output end of described first module, the other end ground connection of described the second resistance, the output of described digital circuit is connected with the control end of described control circuit, and the input of described control circuit is connected with chip power.
Beneficial effect of the present invention is: each LED lamp branch road of the present invention is provided with corresponding constant current control chip, each constant current control chip includes first module for generation of reference current, is used for the second unit of control LED lamp branch current, the control output end of first module is connected with the control input end of second unit, makes first module according to the reference current that self produces and by second unit control LED lamp branch current; The input of LED lamp branch road is connected with circuit power, and the output of LED lamp branch road is connected with the current input terminal of second unit, the current output terminal ground connection of second unit; From first constant current control chip to last constant current control chip, the first module of all constant current control chips is connected in series successively; First constant current control chip is arranged to the Marst pattern, is used for the generating reference electric current; Remaining constant current control chip is arranged to the Slave pattern, make as the reference current from the first module of the constant current control chip of pattern and be equal to the reference current that first constant current control chip generates, the reference current that is the first module of every constant current control chip in the LED lamp branch road is equal to the reference current that first constant current control chip generates, thereby control exactly the electric current of each LED lamp branch road in the LED circuit for lamp, make the electric current current-sharing of each LED lamp branch road.Therefore, the present invention utilizes constant current control chip internal resistance, characteristic that the pipe matching degree is high, realize that the high-precision current between a plurality of constant current control chips equates, resistance, pipe there are differences electric current current-sharing on each LED lamp branch road without impact between different constant current control chips; And, need only in the overall presure drop on the current sampling resistor in working range, can arbitrarily expand, namely extensibility is strong.
Description of drawings
Fig. 1 is the circuit theory diagrams of single-chip multi-path flow equalizing system in the prior art.
Fig. 2 is the fixing circuit theory diagrams of constant-current system in the prior art.
Fig. 3 is the circuit theory diagrams of the variable constant-current system scheme one of electric current in the prior art.
Fig. 4 is the circuit theory diagrams of the variable constant-current system scheme two of electric current in the prior art.
Fig. 5 is the circuit theory diagrams of the variable constant-current system scheme three of electric current in the prior art.
Fig. 6 is the circuit theory diagrams of the embodiment of the invention 1.
Fig. 7 is the internal circuit schematic diagram of the constant current control chip of the embodiment of the invention 1.
Fig. 8 is the circuit theory diagrams of first module of the constant current control chip of the embodiment of the invention 2.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Embodiment 1: the current-equalizing system for each branch current of control LED circuit for lamp of the present invention, as shown in Figure 6, it comprises each LED lamp branch road (LED1, LED2 of the parallel connection of LED circuit for lamp ... LEDn), every LED lamp branch road all is to be in series by a plurality of LED lamps; This system also comprises constant current control chip (IC1, the IC2 corresponding with each LED lamp branch road ... ICn), each constant current control chip includes first module 11 for generation of reference current, is used for the second unit 12 of control LED lamp branch current, the control output end of first module 11 is connected with the control input end of second unit 12, makes first module 11 pass through second unit 12 control LED lamp branch current (I_LED1, I_LED2 according to the reference current that self produces ... I_LEDn); The input of LED lamp branch road is connected with circuit power (VCC), and the output of LED lamp branch road is connected with the current input terminal of second unit 12, the current output terminal ground connection (GND) of second unit 12; From first constant current control chip to last constant current control chip, the first module 11 of all constant current control chips is connected in series successively, the current input terminal that is the first module 11 of first constant current control chip is connected with chip power (V_IC), the current output terminal of the first module 11 of first constant current control chip is connected with the current input terminal of the first module 11 of second constant current control chip, the rest may be inferred, until the first module 11 of last constant current control chip; First constant current control chip is arranged to the Marst(holotype) pattern, be used for generating reference electric current (Iset); Remaining constant current control chip is arranged to Slave(from pattern) pattern, make as the reference current from the first module 11 of the constant current control chip of pattern and be equal to the reference current that first constant current control chip generates.Wherein, because first constant current control chip is arranged to the Marst pattern, the reference current of its generation flow through the constant current control chip of each bar LED lamp branch road, and the second unit 12 of all constant current control chips all generates the electric current of accurate LED lamp branch road according to reference current.Certainly, need how many bar LED lamp branch roads, what the constant current control chips of just connecting get final product.Wherein, the first module 11 among Fig. 6 and second unit 12 are simple schematic diagram, the detailed construction description that sees below.
Specifically, as shown in Figure 7, the second unit 12 of constant current control chip comprises the 3rd resistance (R3), the 4th resistance (R4), the first field effect transistor (M1), the second field effect transistor (M2), the 3rd field effect transistor (M3), the 4th field effect transistor (M4), internal current source (I_inner), the first operational amplifier (U1), the grid of the first field effect transistor is the control input end of second unit 12, the source electrode of the first field effect transistor is connected with chip power, the drain electrode of the first field effect transistor is connected with the drain electrode of the second field effect transistor, the grid of the second field effect transistor is arranged to the Slave pattern, one end of the source electrode of the second field effect transistor and the 3rd resistance, the source electrode of the 3rd field effect transistor, the in-phase input end of the first operational amplifier connects, the other end ground connection of the 3rd resistance, the grid of the 3rd field effect transistor is arranged to the Marst pattern, the drain electrode of the 3rd field effect transistor is connected with chip power by internal current source, the source electrode of the inverting input of the first operational amplifier and the 4th field effect transistor, one end of the 4th resistance connects, the grid of the 4th field effect transistor is connected with the output of the first operational amplifier, the drain electrode of the 4th field effect transistor is the current input terminal of second unit 12, and the other end of the 4th resistance is the current output terminal of second unit 12.
The first module 11 of constant current control chip comprises the first resistance (R1), the second resistance (R2), the 5th field effect transistor (M5), the 6th field effect transistor (M6), the 7th field effect transistor (M7), the second operational amplifier (U2), the 3rd operational amplifier (U3), one end (A1) of the first resistance is the current input terminal of first module 11, and an end of the first resistance is connected with the in-phase input end of the second operational amplifier, the other end of the first resistance (B1) is the current output terminal of first module 11, and the other end of the first resistance is connected with the in-phase input end of the 3rd operational amplifier, one end (A2) of the inverting input of the second operational amplifier and the second resistance, the source electrode of the 6th field effect transistor connects, the grid of the 6th field effect transistor is connected with the output of the second operational amplifier, the drain electrode of the drain electrode of the 6th field effect transistor and the 5th field effect transistor, the grid of the 5th field effect transistor connects, and the grid of the 5th field effect transistor is the control output end of first module 11, the source electrode of the 5th field effect transistor is connected with chip power, the other end of the inverting input of the 3rd operational amplifier and the second resistance (B2), the source electrode of the 7th field effect transistor connects, the grid of the 7th field effect transistor is connected with the output of the 3rd operational amplifier, the grounded drain of the 7th field effect transistor.
Because constant current control chip internal resistance can reach quite high matching degree, first module 11(A_Block at the constant current control chip) in, the absolute value of the first resistance (R1) and the second resistance (R2) is not crucial, as long as the first resistance and the second resistors match.The second operational amplifier, the 3rd operational amplifier can guarantee that A1 voltage equals A2 voltage, and B1 voltage equals B2 voltage, and the electric current that then flows through the first resistance and the second resistance equates.
Because reference current Iset equals electric current I _ ext behind the mirror image, second unit 12(B_Block at the constant current control chip) in, the second field effect transistor that works in the Slave pattern relies on circuit I _ ext that the electric current that flows through LED lamp branch road is set, the 3rd field effect transistor that works in the Mast pattern adopts internal current source, and this internal current source is exported as electric current I set mirror image.Certainly, in the second unit 12 of constant current control chip, realize that by reference current Iset output current can be circuit miscellaneous, the present invention does not list one by one, but ought to belong to the replacement that is equal to of the present invention.
Embodiment 2: the embodiment 2 of the current-equalizing system for controlling each branch current of LED circuit for lamp of the present invention, the difference of present embodiment and embodiment 1 is, adopt the method for digital circuit 111 to realize current mirror, as shown in Figure 8, the first module 11 of constant current control chip comprises the first resistance (R1), the second resistance (R2), be used for to calculate the digital circuit 111 of difference of the voltage drop of the first resistance and the second resistance, be used for adjusting the control circuit 112 that flows through the second resistor current, one end (A1) of the first resistance is the current input terminal of first module 11, the other end of the first resistance (B1) is the current output terminal of first module 11, an and end of the first resistance, the other end of the first resistance all is connected with the first sampling input (ADC1) of digital circuit 111, make the digital circuit 111 can be by the sample voltage at the first resistance two ends of the first sampling input, one end (A2) of the second resistance, the other end of the second resistance (B2) all is connected with the second sampling input (ADC2) of digital circuit 111, make the digital circuit 111 can be by the sample voltage at the second resistance two ends of the second sampling input, and an end of the second resistance is connected with the output of control circuit 112, the output of control circuit 112 is the control output end of first module 11, the other end ground connection of the second resistance, the output of digital circuit 111 is connected with the control end of control circuit 112, and the input of control circuit 112 is connected with chip power.
Specifically, the digital circuit 111 of present embodiment is by the ADC(analog-to-digital conversion) method calculates the difference of the voltage drop of the first resistance and the second resistance, flow through the electric current of the second resistance by this difference adjustment, so that the voltage drop of final the first resistance and the second resistance equates that the electric current that then flows through the first resistance and the second resistance equates.
Other structure and the operation principle of present embodiment are identical with embodiment 1, do not repeat them here.
Certainly, adopt affix digital communication interface of the present invention or PWM dimming mode, also can realize all LED lamp branch road light modulations or separately light modulation.
In sum, the present invention adopts current-series to flow through the constant current control chip of each LED lamp branch road, realize current-sharing between multi-chip as the reference electric current, so the present invention can realize the high-precision current coupling between multi-chip, need only in the overall presure drop on the current sampling resistor in working range, can arbitrarily expand, namely extensibility is strong.
Should be noted that at last; above embodiment is only in order to illustrate technical scheme of the present invention; but not limiting the scope of the invention; although with reference to preferred embodiment the present invention has been done to explain; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.
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| CN201210283933.7A CN102858057B (en) | 2012-08-10 | 2012-08-10 | Current equalizing system for controlling current of each branch of LED lamp circuit |
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| CN201210283933.7A CN102858057B (en) | 2012-08-10 | 2012-08-10 | Current equalizing system for controlling current of each branch of LED lamp circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114512062A (en) * | 2020-10-28 | 2022-05-17 | 北京京东方光电科技有限公司 | A light-emitting module, a driving method thereof, and a display device |
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| CN101916547A (en) * | 2010-07-14 | 2010-12-15 | 成都芯源系统有限公司 | Driver for driving a plurality of light emitting elements and display device |
| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
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| DE10329367A1 (en) * | 2003-03-28 | 2004-10-14 | Osram Opto Semiconductors Gmbh | LED chain for signaling arrangement, has converter circuit which forces predetermined current through LED chain independent of external influences |
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