CN103596322A - Constant current comparison circuit for LED driving circuit - Google Patents
Constant current comparison circuit for LED driving circuit Download PDFInfo
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- CN103596322A CN103596322A CN201210298581.2A CN201210298581A CN103596322A CN 103596322 A CN103596322 A CN 103596322A CN 201210298581 A CN201210298581 A CN 201210298581A CN 103596322 A CN103596322 A CN 103596322A
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Abstract
The invention discloses a constant current comparison circuit for an LED driving circuit. The constant current comparison circuit for the LED driving circuit comprises a first sampling resistor, a second sampling resistor, a first gain adjusting module, a second gain adjusting module, a first indication module, a second indication module and a voltage amplification module. The constant current comparison circuit for the LED driving circuit respectively samples voltages of a first LED lamp set and a second LED lamp set through the first sampling resistor and the second sampling resistor, the sampled voltages are inputted into the voltage amplification module, the first gain adjusting module and the second gain adjusting module which are connected with the voltage amplification module can adjust amplification gain of the voltage amplification module, so enough great voltages can be provided to enable the first indication module and the second indication module to display a voltage difference of the first LED lamp set and the second LED lamp set, and thereby the lamp set of the first LED lamp set and the second LED lamp set which has a higher current can be determined.
Description
Technical field
The present invention relates to current comparison circuit, particularly relate to a kind of constant current comparison circuit for LED drive circuit.
Background technology
LED lamp group is in the market applied generally in LED display, and general every LED lamp group is all to adopt independently drive circuit, and therefore, the electric current of every LED lamp group can exist certain deviation.When current deviation surpasses certain limit, can cause luminous intensity distribution inhomogeneous, thereby cause the too high LED lamp group of electric current aged deterioration in advance, and then affect the useful life of whole LED display.
Summary of the invention
Based on this, be necessary to provide a kind of constant current comparison circuit for LED drive circuit that can show that LED lamp group electric current is higher.
A constant current comparison circuit for LED drive circuit, comprises the first sampling resistor, the second sampling resistor, the first gain adjustment module, the second gain adjustment module, the first indicating module, the second indicating module and voltage amplification module;
Described first sampling resistor one end is used for being connected with a LED lamp group, other end ground connection;
Described second sampling resistor one end is used for being connected with the 2nd LED lamp group, other end ground connection;
The input of described the first gain adjustment module is connected with the common port of a described LED lamp group with described the first sampling resistor, the control end of described the first gain adjustment module is connected with the inverting input of described voltage amplification module, and the output of described the first gain adjustment module is connected with the output of described voltage amplification module;
The input of described the second gain adjustment module is connected with the common port of described the 2nd LED lamp group with described the first sampling resistor, the control end of described the second gain adjustment module is connected with the normal phase input end of described voltage amplification module, the output head grounding of described the second gain adjustment module;
Described the first indicating module is connected with described the second indicating module, and described the first indicating module is connected with the output of described voltage amplification module with a common port of described the second indicating module, another common end grounding.
Therein in an embodiment, described the first gain adjustment module comprises divider resistance R3 and divider resistance R5, described divider resistance R3 one end is connected with described divider resistance R5, the other end of described divider resistance R3 is the input of described the first gain adjustment module, the other end of described divider resistance R5 is the output of described the first gain adjustment module, and the common port of described divider resistance R3 and described divider resistance R5 is the control end of described the first gain adjustment module.
Therein in an embodiment, described the second gain adjustment module comprises divider resistance R4 and divider resistance R6, described divider resistance R4 one end is connected with described divider resistance R6, the other end of described divider resistance R4 is the input of described the second gain adjustment module, the other end of described divider resistance R6 is the output of described the second gain adjustment module, and the common port of described divider resistance R4 and described divider resistance R6 is the control end of described the second gain adjustment module.
Therein in an embodiment, described voltage amplification module is operational amplifier U1B, the normal phase input end of described operational amplifier U1B is the normal phase input end of described voltage amplification module, the inverting input of described operational amplifier U1B is the inverting input of described voltage amplification module, and the output of described operational amplifier U1B is the output of described voltage amplification module.
Therein in an embodiment, described the first indicating module is LED7, described the second indicating module is LED8, the negative electrode of described LED7 and the anodic bonding of described LED8, the negative electrode of described LED8 and the anodic bonding of described LED7, a common port of described LED7 and described LED8 is connected with the output of described voltage amplification module, another common end grounding of described LED7 and described LED8.
In an embodiment, also comprise current-limiting resistance R7 therein, described current-limiting resistance R7 is series between the output and described the first indicating module and a common port of described the second indicating module of described voltage amplification module.
The above-mentioned constant current comparison circuit for LED drive circuit is by sample the respectively voltage of a LED lamp group and the 2nd LED lamp group of the first sampling resistor and the second sampling resistor, and the voltage of sampling is input to voltage amplification module, and the first gain adjustment module being connected with voltage amplification module and the second gain adjustment module can regulation voltage amplification module gain amplifier, thereby can provide enough voltage to allow the first indicating module and the second indicating module show the voltage difference between a LED lamp group and the 2nd LED lamp group, and then can judge the higher lamp group of electric current in a LED lamp group and the 2nd LED lamp group.
Provide in addition a kind of and can show LED lamp group electric current LED lamp group current monitoring device higher and that can regulate higher LED lamp group drive current.
A kind of LED lamp group current monitoring device, comprise above-mentioned constant current comparison circuit, acquisition module and feedback control module for LED drive circuit, described acquisition module is connected with described feedback control module with the described constant current comparison circuit for LED drive circuit, described feedback control module is connected with the described constant current comparison circuit for LED drive circuit
Described acquisition module is for gathering the output signal of the constant current comparison circuit of described LED drive circuit, and the output signal of collection is transferred to described feedback control module, described feedback control module is controlled a described LED lamp group of constant current comparison circuit and the voltage at the 2nd LED lamp group two ends for LED drive circuit according to the output signal receiving.
Above-mentioned LED lamp group current monitoring device judges LED lamp group by the constant current comparison circuit for LED drive circuit, and electric current is higher and show by the first indicating module and the second indicating module, acquisition module gathers the output signal of the first indicating module and the second indicating module, and the output signal of collection is transferred to feedback control module, feedback control module is controlled the voltage at a LED lamp group and the 2nd LED lamp group two ends according to the output signal receiving.Thereby above-mentioned LED lamp group current monitoring device can guarantee that LED lamp group can reduce higher electric current in time when electric current is higher, avoid LED lamp assembly light uneven and cause lamp group aged deterioration.
Accompanying drawing explanation
Fig. 1 is the module map for the constant current comparison circuit of LED drive circuit;
Fig. 2 is the module map of LED lamp group current monitoring device;
Fig. 3 is the schematic diagram for the constant current comparison circuit of LED drive circuit.
Embodiment
As shown in Figure 1, be the constant current comparison circuit for LED drive circuit.A constant current comparison circuit for LED drive circuit, comprises the first sampling resistor 101, the second sampling resistor 103, the first gain adjustment module 105, the second gain adjustment module 107, the first indicating module 109, the second indicating module 111 and voltage amplification module 113.
The input of the first gain adjustment module 105 is connected with the common port of a LED lamp group with the first sampling resistor 101, the control end of the first gain adjustment module 105 is connected with the inverting input of voltage amplification module 113, and the output of the first gain adjustment module 105 is connected with the output of voltage amplification module 113.
The input of the second gain adjustment module 107 is connected with the common port of the 2nd LED lamp group with the first sampling resistor 101, the control end of the second gain adjustment module 107 is connected with the normal phase input end of voltage amplification module 113, the output head grounding of the second gain adjustment module 107.
The first indicating module 109 is connected with the second indicating module 111, and the first indicating module 109 is connected with the output of voltage amplification module 113 with a common port of the second indicating module 111, another common end grounding.
The first sampling resistor 101 and the second sampling resistor 103 are respectively the current sampling resistor of a LED lamp group and the 2nd LED lamp group.
The first gain module 105 and 107 of the second gain modules are the voltage gains for regulation voltage amplification module 113, because needing constant current, LED drives, when fluctuation occurs electric current, can affect the luminance of LED, therefore in need to the current deviation of two groups of LED lamp groups being controlled among a small circle, so employing high-gain, while making two groups of LED lamp groups occur current deviation, can find in time, and in controlled range, regulate the electric current of two groups of LED lamp groups.
The first indicating module 109 and the second indicating module 111 are used to indicate the current bias of LED lamp group.When the first indicating module 109 sends index signal, the electric current that represents a LED lamp group is higher, when the second indicating module 111 sends index signal, the electric current that represents the 2nd LED lamp group is higher, when the first indicating module 109 and the second indicating module 111 all do not send index signal, represent the electric current basis equalization of a LED lamp group and the 2nd LED lamp group.Therefore, by the first indicating module 109 and the second indicating module 111, just can judge that whether the electric current of LED lamp group is higher, if higher, can adjust in time the electric current of higher LED lamp group, avoid that electric current is higher to cause damage to LED lamp group.
Incorporated by reference to Fig. 2.
Particularly, the first sampling resistor is that resistance R 1, the second sampling resistor is resistance R 2.
The first gain adjustment module 105 comprises divider resistance R3 and divider resistance R5, divider resistance R3 one end is connected with divider resistance R5, the other end of divider resistance R3 is the input of the first gain adjustment module 105, the other end of divider resistance R5 is the output of the first gain adjustment module 105, and the common port of divider resistance R3 and divider resistance R5 is the control end of the first gain adjustment module 105.
The second gain adjustment module 107 comprises divider resistance R4 and divider resistance R6, divider resistance R4 one end is connected with divider resistance R6, the other end of divider resistance R4 is the input of the second gain adjustment module 107, the other end of divider resistance R6 is the output of the second gain adjustment module 107, and the common port of divider resistance R4 and divider resistance R6 is the control end of the second gain adjustment module 107.
The first indicating module 109 is LED7, the second indicating module 111 is LED8, the negative electrode of LED7 and the anodic bonding of LED8, the negative electrode of LED8 and the anodic bonding of LED7, a common port of LED7 and LED8 is connected with the output of voltage amplification module 113, another common end grounding of LED7 and LED8.
Constant current comparison circuit for LED drive circuit also comprises current-limiting resistance R7, and current-limiting resistance R7 is series between the output and the first indicating module 109 and a common port of the second indicating module 111 of voltage amplification module 113.
In the present embodiment, the first sampling resistor 101 equates with the resistance of the second sampling resistor 103, and the resistance of the first gain adjustment module 105 and the second gain adjustment module 107 also equates.Particularly, i.e. R1=R2, R3=R4, R5=R6.Be generally the power consumption that reduces circuit, the resistance of resistance R 1 and resistance R 2 is less.
Based on above-mentioned all embodiment, as follows for the operation principle of the constant current comparison circuit of LED drive circuit:
When passing through resistance R 1 and resistance R 2, the electric current of two LED lamp groups can produce equivalent pressure drop V1 and V2.The operating current of two LED lamp groups of ear is substantially equal, when the electric current difference of two paths of LED lamp group is no more than 5%, even after electric current difference amplifies via voltage amplification module 113, be also not enough to light LED7 or LED8 via the voltage of exporting after current-limiting resistance R7.
During electric current in the current ratio resistance R 2 in resistance R 1 large 5%, according to the amplification formula V0=(V1-V2 of voltage amplification module 113) * R5/R3, can calculate the output voltage of voltage amplification module 113, and the value of R5/R3 is through setting in advance, as long as when the difference between V1 and V2 is greater than 5%, output voltage V 0 is all enough to light LED7.
When the electric current little 5% of the current ratio resistance R 2 of resistance R 1, principle is the same.
After LED7 or LED8 are lit, the brightness of LED is higher, represents that two groups of electric current differences between LED lamp group are larger.
In one embodiment, the operating current of supposing two LED lamp groups is designed to 700mA, R5=560K Ω, R3=10K Ω, by R1/R2(0.1 Ω) time, V1/V2 is 700*0.2=140mV so, due to V1=V2, and Vo=0V, LED7 and LED8 all do not work, and represent that the current difference of two LED lamp groups does not surpass 5%.When the operating current difference of two LED surpasses 5%, for example V2 voltage is greater than V1, after voltage amplification module 113, output voltage V o=(700-700*0.95) * 560/1=1.96V, this positive voltage is just lighted LED8, if V1 is greater than V2, after voltage amplification module 113, output voltage V o=(700-700*1.05) * 560/1=-1.96V, negative voltage is just lighted LED7.
The above-mentioned constant current comparison circuit for LED drive circuit is by sample the respectively voltage of a LED lamp group and the 2nd LED lamp group of the first sampling resistor and the second sampling resistor, and the voltage of sampling is input to voltage amplification module, and the first gain adjustment module being connected with voltage amplification module and the second gain adjustment module can regulation voltage amplification module gain amplifier, thereby can provide enough voltage to allow the first indicating module and the second indicating module show the voltage difference between a LED lamp group and the 2nd LED lamp group, and then can judge the higher lamp group of electric current in a LED lamp group and the 2nd LED lamp group.
As shown in Figure 3, be the module map of LED lamp group current monitoring device.A kind of LED lamp group current monitoring device, comprise the above-mentioned constant current comparison circuit 10 for LED drive circuit, acquisition module 20 and feedback control module 30, acquisition module 20 is connected with feedback control module 30 with the constant current comparison circuit 10 for LED drive circuit, feedback control module 30 is connected with the constant current comparison circuit 10 for LED drive circuit
Electric current is higher and by the first indicating module 109 and the second indicating module 111 demonstrations by judge LED lamp group for the constant current comparison circuit 10 of LED drive circuit for above-mentioned LED lamp group current monitoring device, acquisition module 20 gathers the output signal of the first indicating module 109 and the second indicating module 111, and the output signal of collection is transferred to feedback control module 30, feedback control module 30 is controlled the voltage at a LED lamp group and the 2nd LED lamp group two ends according to the output signal receiving.If the LED7 in the first indicating module 109 lights, the drive current that feedback control module 30 is controlled a LED lamp group reduces, if the LED8 in the second indicating module 111 lights, the drive current that feedback control module 30 is controlled a LED lamp group reduces.If the first indicating module 109 and the first indicating module 111 be output signal not all, represent that two LED lamp groups are all working properly.
Thereby above-mentioned LED lamp group current monitoring device can guarantee that LED lamp group can reduce higher electric current in time when electric current is higher, avoid LED lamp assembly light uneven and cause lamp group aged deterioration.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (7)
1. for a constant current comparison circuit for LED drive circuit, it is characterized in that, comprise the first sampling resistor, the second sampling resistor, the first gain adjustment module, the second gain adjustment module, the first indicating module, the second indicating module and voltage amplification module;
Described first sampling resistor one end is used for being connected with a LED lamp group, other end ground connection;
Described second sampling resistor one end is used for being connected with the 2nd LED lamp group, other end ground connection;
The input of described the first gain adjustment module is connected with the common port of a described LED lamp group with described the first sampling resistor, the control end of described the first gain adjustment module is connected with the inverting input of described voltage amplification module, and the output of described the first gain adjustment module is connected with the output of described voltage amplification module;
The input of described the second gain adjustment module is connected with the common port of described the 2nd LED lamp group with described the first sampling resistor, the control end of described the second gain adjustment module is connected with the normal phase input end of described voltage amplification module, the output head grounding of described the second gain adjustment module;
Described the first indicating module is connected with described the second indicating module, and described the first indicating module is connected with the output of described voltage amplification module with a common port of described the second indicating module, another common end grounding.
2. the constant current comparison circuit for LED drive circuit according to claim 1, it is characterized in that, described the first gain adjustment module comprises divider resistance R3 and divider resistance R5, described divider resistance R3 one end is connected with described divider resistance R5, the other end of described divider resistance R3 is the input of described the first gain adjustment module, the other end of described divider resistance R5 is the output of described the first gain adjustment module, and the common port of described divider resistance R3 and described divider resistance R5 is the control end of described the first gain adjustment module.
3. the constant current comparison circuit for LED drive circuit according to claim 1, it is characterized in that, described the second gain adjustment module comprises divider resistance R4 and divider resistance R6, described divider resistance R4 one end is connected with described divider resistance R6, the other end of described divider resistance R4 is the input of described the second gain adjustment module, the other end of described divider resistance R6 is the output of described the second gain adjustment module, and the common port of described divider resistance R4 and described divider resistance R6 is the control end of described the second gain adjustment module.
4. the constant current comparison circuit for LED drive circuit according to claim 1, it is characterized in that, described voltage amplification module is operational amplifier U1B, the normal phase input end of described operational amplifier U1B is the normal phase input end of described voltage amplification module, the inverting input of described operational amplifier U1B is the inverting input of described voltage amplification module, and the output of described operational amplifier U1B is the output of described voltage amplification module.
5. the constant current comparison circuit for LED drive circuit according to claim 1, it is characterized in that, described the first indicating module is LED7, described the second indicating module is LED8, the negative electrode of described LED7 and the anodic bonding of described LED8, the negative electrode of described LED8 and the anodic bonding of described LED7, a common port of described LED7 and described LED8 is connected with the output of described voltage amplification module, another common end grounding of described LED7 and described LED8.
6. the constant current comparison circuit for LED drive circuit according to claim 1, it is characterized in that, also comprise current-limiting resistance R7, described current-limiting resistance R7 is series between the output and described the first indicating module and a common port of described the second indicating module of described voltage amplification module.
7. a LED lamp group current monitoring device, it is characterized in that, comprise as described in claim 1-6 any one constant current comparison circuit, acquisition module and feedback control module for LED drive circuit, described acquisition module is connected with described feedback control module with the described constant current comparison circuit for LED drive circuit, described feedback control module is connected with the described constant current comparison circuit for LED drive circuit
Described acquisition module is for gathering the output signal of the constant current comparison circuit of described LED drive circuit, and the output signal of collection is transferred to described feedback control module, described feedback control module is controlled a described LED lamp group of constant current comparison circuit and the voltage at the 2nd LED lamp group two ends for LED drive circuit according to the output signal receiving.
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Cited By (3)
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| CN104267249A (en) * | 2014-10-09 | 2015-01-07 | 长智光电（四川）有限公司 | Device for measuring voltage difference between LED string lights |
| CN104375549A (en) * | 2014-10-30 | 2015-02-25 | 中国电子科技集团公司第三十六研究所 | Latching-preventing circuit of CMOS device |
| CN108375634A (en) * | 2018-01-31 | 2018-08-07 | 苏州智能制造研究院有限公司 | A kind of difference frequency continuation sinusoidal radiating circuit |
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| CN102256421A (en) * | 2011-07-28 | 2011-11-23 | 林万炯 | High-precision multipath LED (light-emitting diode) current-equalizing circuit |
| CN202143271U (en) * | 2011-07-28 | 2012-02-08 | 林万炯 | High accuracy multipath LED current sharing circuit |
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| CN201967183U (en) * | 2010-10-22 | 2011-09-07 | 英飞特电子（杭州）有限公司 | LED multi-way output current-sharing circuit |
| CN201967204U (en) * | 2011-01-07 | 2011-09-07 | 英飞特电子（杭州）有限公司 | Multi-output constant-current driving circuit of light-emitting diode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104267249A (en) * | 2014-10-09 | 2015-01-07 | 长智光电（四川）有限公司 | Device for measuring voltage difference between LED string lights |
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| CN108375634A (en) * | 2018-01-31 | 2018-08-07 | 苏州智能制造研究院有限公司 | A kind of difference frequency continuation sinusoidal radiating circuit |
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