CN201839487U - LED multi-channel constant-current control circuit - Google Patents
LED multi-channel constant-current control circuit Download PDFInfo
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- CN201839487U CN201839487U CN2010205578180U CN201020557818U CN201839487U CN 201839487 U CN201839487 U CN 201839487U CN 2010205578180 U CN2010205578180 U CN 2010205578180U CN 201020557818 U CN201020557818 U CN 201020557818U CN 201839487 U CN201839487 U CN 201839487U
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Abstract
An LED multi-channel constant-current control circuit comprises a voltage detecting circuit, a voltage reference circuit, a signal comparison circuit and a control signal output circuit which are sequentially connected. The voltage detecting circuit consists of a resistor 1, a diode and a capacitor 2, and the diode and the capacitor 2 respectively correspond to an LED tube or an LED tube group. The voltage reference circuit comprises a resistor 3, a resistor 4 and a capacitor 3. The signal comparison circuit consists of a capacitor 4, a capacitor 5, a resistor 5 and an operational amplifier, or the signal comparison circuit includes a diode 3, a resistor 7 and a comparator integrated circuit. The control signal output circuit includes a resistor 6. The LED multi-channel constant-current control circuit realizes current stabilization by means of improving efficiency of a linear series-connection current stabilizing circuit, and has the advantages of high current stabilization efficiency, wide current stabilization range, linear current stabilization, zero EMC (electron magnetic compatibility) interference, simplicity in circuit, flexibility in application and the like.
Description
Technical field
The utility model relates to a kind of LED control circuit, is specifically related to a kind of LED multichannel constant-current control circuit.
Background technology
The LED light-emitting diode has characteristics such as luminous efficiency height, energy-conserving and environment-protective, finds broad application on lighting.
A common LED light fixture need adopt many LED pipes to constitute by the series and parallel mode.Because the parameter of LED pipe has the discreteness feature, cause the time by identical electric current, the pressure drop difference of each LED pipe, when the LED pipe adds identical voltage, the operating current difference of each LED pipe.When being connected into a string use when how by all means, the discreteness of every string LED pipe is bigger, causes when using the LED pipe of identical driven series connection, each is gone here and there the operating current of LED pipe and differs greatly, electric current too greatly not only causes power consumption to increase, and brings LED pipe serviceability temperature to raise the lost of life.
The perfect driving of LED light-emitting diode is a constant-current driving, to address the above problem.Adopt constant-current driving, every string LED pipe all needs a constant-current source.
Existing LED light fixture drives constant-current source and adopts following structure usually: a kind of scheme is the output of adopting constant pressure source through the linearity current stabilization of connecting, and produces a constant-current source.This scheme cost is low, and EMC (ElectroMagnetic Compatibility Electro Magnetic Compatibility) handles simple, but efficient is low, and the current stabilization scope is low.Other scheme of planting is to adopt constant pressure source output after the step-down of BUCK circuit or BOOST circuit boost, and produces a constant-current source.This scheme efficient height, current stabilization wide ranges, but circuit complexity, reliability is low, and it is very big that EMC disturbs, and deals with very difficultly, and cost is also very high.
The utility model content
The technical problems to be solved in the utility model is, a kind of LED multichannel constant-current control circuit is provided, and is used through the linearity constant-current source that current stabilization produces of connect with adopting constant pressure source output, overcomes the above-mentioned defective that has LED light fixture multiple constant current source circuit now.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of LED multichannel constant-current control circuit, it is characterized in that, comprise the voltage detecting circuit that connects successively, voltage reference circuit, signal comparator circuit and control signal output circuit;
Described voltage detecting circuit comprises the diode and the electric capacity 2 of resistance 1, respectively corresponding LED pipe or LED pipe group, described electric capacity 2 one end ground connection, the other end connect described resistance 1, the auxiliary power supply VCC of another termination prime constant pressure source of this resistance 1 or back level constant-current source, the positive terminal of described diode connects the link of described resistance 1 and described electric capacity 2 respectively, and the negative pole end of each described diode connects its corresponding LED pipe or LED pipe group;
Described voltage reference circuit comprises resistance 3, resistance 4 and electric capacity 3, and described electric capacity 3 is attempted by resistance 4 two ends, and described resistance 3 is connected in series the precision voltage reference of back resistance 4 end ground connection, resistance 3 termination prime constant pressure sources or back level constant-current circuit with resistance 4;
Described signal comparator circuit comprises electric capacity 4, electric capacity 5, resistance 5 and operational amplifier, two ends after described electric capacity 4 is attempted by described electric capacity 5 and resistance 5 is connected in series constitute negative feedback network, one end of this negative feedback network connects described operational amplifier output terminal, the other end connects the inverting input of described operational amplifier, the in-phase input end of described operational amplifier connects the described resistance 1 of described voltage detecting circuit and the link of described electric capacity 2, inverting input connects the described resistance 3 and resistance 4 series sides of described voltage reference circuit, or the inverting input of described operational amplifier connects the described resistance 1 of described voltage detecting circuit and the link of described electric capacity 2, in-phase input end connects the described resistance 3 and resistance 4 series sides of described voltage reference circuit;
Or described signal comparator circuit comprises diode 3, resistance 7 and comparator integrated circuit, described diode 3 constitutes the hysteresis circuit with two ends after resistance 7 is connected in series, positive pole one end of diode 3 connects the in-phase input end that described comparator ic output, this hysteresis circuit other end connect described comparator integrated circuit in this hysteresis circuit, and the described resistance 1 that the in-phase input end of described comparator integrated circuit connects described voltage detecting circuit is connected the described resistance 3 and resistance 4 series sides of described voltage reference circuit with link, the inverting input of described electric capacity 2;
Described control signal output circuit comprises resistance 6, and output, the other end that described resistance 6 one ends connect described operational amplifier or comparator integrated circuit are output.
In LED multichannel constant-current control circuit of the present utility model, described control signal output circuit comprises diode 4, and described resistance 6 is connected in series with this diode 4; The described resistance 1 that connects described voltage detecting circuit when the in-phase input end of described operational amplifier is during with the link of described electric capacity 2, and the positive terminal of described diode 4 connects the output of described operational amplifier; The described resistance 1 that connects described voltage detecting circuit when the inverting input of described operational amplifier is during with the link of described electric capacity 2, and the negative pole end of described diode 4 connects the output of described operational amplifier; The described resistance 1 that connects described voltage detecting circuit when the in-phase input end of described comparator integrated circuit is during with the link of described electric capacity 2, and the positive terminal of described diode 4 connects the output of described comparator integrated circuit.
In LED multichannel constant-current control circuit of the present utility model, described voltage detecting circuit comprises electric capacity 1 and resistance 2, described electric capacity 1, resistance 2 and electric capacity 2 constitute the RC filter circuit, described electric capacity 1 and electric capacity 2 common grounds, described electric capacity 1 are connected the in-phase input end of described operational amplifier or the in-phase input end of reverse input end or described comparator integrated circuit with resistance 2 links.
Implement LED multichannel constant-current control circuit of the present utility model, compared with the prior art, its beneficial effect is:
1. the peak efficiency of the utility model LED multichannel constant-current control circuit is also higher than existing BUCK or BOOST constant-current source; Experimental results show that, the utility model is by adopting the method that improves linear series current stabilization circuit efficient, reduce the linear pipe voltage to earth of adjusting as far as possible, voltage to earth is minimum can be controlled in the 0.1V, efficient is also higher than switch voltage-stabilizing circuit, and as 11.9V is arrived in the 12V voltage stabilizing, efficient can reach 99.1%, to 52.9V, efficient can reach 99.98% with the 53V voltage stabilizing.
2. the advantage that has BUCK or BOOST constant-current source current stabilization wide ranges, output voltage change 20% with interior can both be well current stabilization efficiently;
3. have linear current stabilization and do not produce the advantage that EMC disturbs;
4. circuit is simple, uses very flexible.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of a kind of embodiment of the utility model LED multichannel constant-current control circuit.
Fig. 2 is the circuit diagram of the another kind of embodiment of the utility model LED multichannel constant-current control circuit.
Fig. 3 is the circuit diagram of the another kind of embodiment of the utility model LED multichannel constant-current control circuit.
Fig. 4 is the circuit diagram of the utility model LED multichannel constant-current control circuit in the voltage stabilizing benchmark utilization of its control signal output circuit connection prime constant source voltage feedback control loop.
Fig. 5 is the circuit diagram of the utility model LED multichannel constant-current control circuit in the optocoupler utilization of its control signal output circuit connection prime constant source voltage feedback control loop.
Fig. 6 is the complete application figure of the voltage detecting circuit wiring of the utility model LED multichannel constant-current control circuit.
Embodiment
As shown in Figure 1, LED multichannel constant-current control circuit 100 of the present utility model comprises voltage detecting circuit 10, voltage reference circuit 20, signal comparator circuit 30 and the control signal output circuit 40 that connects successively.
Voltage detecting circuit 10 comprises resistance R 1, diode D1, D2......DN, capacitor C 1, C2, resistance R 2.Auxiliary power supply VCC, another termination capacitor C 2 of resistance R 1 one termination prime constant pressure sources or back level constant-current source, capacitor C 1, C2, resistance R 2 constitute the RC filter circuit, capacitor C 1, C2 common ground, the output of capacitor C 1 and resistance R 2 link extraction voltage testing circuits 10, the positive terminal of diode D1, D2......DN connect resistance R 1 respectively and connect its corresponding LED pipe or LED pipe group LED1, LED2......LEDN with link, the negative pole end of capacitor C 2.
In other embodiments, can adopt an electric capacity to replace above-mentioned RC filter circuit, be that voltage detecting circuit 10 comprises resistance R 1, diode D1, D2......DN, capacitor C 2, the auxiliary power supply VCC of resistance R 1 one termination prime constant pressure sources or back level constant-current source, another termination capacitor C 2, capacitor C 2 ground connection, the output of capacitor C 2 and resistance R 1 link extraction voltage testing circuit 10, diode D1, the positive terminal of D2......DN connects the link of resistance R 1 and capacitor C 2 respectively, negative pole end connects its corresponding LED pipe or LED pipe group LED1, LED2......LEDN.
Voltage reference circuit 20 comprises resistance R 3, resistance R 4 and capacitor C 3.Capacitor C 3 is attempted by resistance R 4 two ends, resistance R 3 is connected in series the precision voltage reference VREF of back resistance R 4 end ground connection, resistance R 3 termination prime constant pressure sources or back level constant-current circuit, the output of resistance R 3 and resistance R 4 link extraction voltage reference circuits 20 with resistance R 4.
Signal comparator circuit 30 comprises capacitor C 4, capacitor C 5, resistance R 5 and operational amplifier U1-A.Two ends after capacitor C 4 is attempted by capacitor C 5 and resistance R 5 is connected in series constitute negative feedback network, the output (pin 1) of an end concatenation operation amplifier U1-A of this negative feedback network, the inverting input (pin 2) of other end concatenation operation amplifier U1-A.The in-phase input end of operational amplifier U1-A (pin 3) connects the output of voltage detecting circuit 10, promptly connect the link (when voltage detecting circuit 10 adopts the RC filter circuits) of resistance R 2 with the capacitor C 1 of voltage detecting circuit 10 or is connected the link (when electric capacity of voltage detecting circuit 10 employings replaces the RC filter circuit) of resistance R 1 and capacitor C 2, the inverting input of operational amplifier U1-A (pin 2) connects the output of voltage reference circuit 20, promptly connects the series side of resistance R 3 with the resistance R 4 of described voltage reference circuit 20.
Control signal output circuit 40 comprises resistance R 6 and diode D4 ', and resistance R 6 is connected in series with diode D4 '.The output (pin 1) of the positive terminal concatenation operation amplifier UI-A of diode D4 '.
As shown in Figure 2, in other embodiments, the inverting input of the operational amplifier U1-A of signal comparator circuit 30 (pin 2) connects the output of voltage detecting circuit 10, promptly connect the link (when voltage detecting circuit 10 adopts the RC filter circuits) of resistance R 2 with the capacitor C 1 of voltage detecting circuit 10 or is connected the link (when electric capacity of voltage detecting circuit 10 employings replaces the RC filter circuit) of resistance R 1 and capacitor C 2, the in-phase input end of operational amplifier U1-A (pin 3) connects the output of voltage reference circuit 20, the series side that promptly connects resistance R 3 with the resistance R 4 of described voltage reference circuit 20, the output (pin 1) of the negative pole end concatenation operation amplifier UI-A of the diode D4 ' of control signal output circuit 40 also can be realized the object of the invention at this moment.
As shown in Figure 3, in other embodiments, signal comparator circuit 30 comprises diode D3 ', resistance R 7 ' and comparator integrated circuit U5-A.Diode D3 ' is connected in series with resistance R 7 ' and constitutes hysteresis circuit (preventing comparator integrated circuit U5-A misoperation), positive pole one end of diode D3 ' connects the output (pin 1) of comparator integrated circuit U5-A in this hysteresis circuit, the other end of hysteresis circuit connects the in-phase input end (pin 3) of comparator integrated circuit U5-A, the in-phase input end of comparator integrated circuit U5-A connects the output of voltage detecting circuit 10, promptly connect the link (when voltage detecting circuit 10 adopts the RC filter circuits) of resistance R 2 with the capacitor C 1 of voltage detecting circuit 10 or is connected the link (when electric capacity of voltage detecting circuit 10 employings replaces the RC filter circuit) of resistance R 1 and capacitor C 2, the inverting input of comparator integrated circuit U5-A (pin 2) connects the output of voltage reference circuit 20, promptly connects the series side of resistance R 3 with the resistance R 4 of described voltage reference circuit 20.The positive terminal of the diode D4 ' of control signal output circuit 40 connects the output (pin 1) of comparator integrated circuit U5-A at this moment.
As shown in Figure 4, when the output of control signal output circuit 40 connected the voltage stabilizing benchmark (5 pin of the operational amplifier U2-B of prime) of prime constant source voltage feedback control loop, control signal output circuit 40 must adopt resistance R 6 to be connected in series formation with diode D4 '.
In other embodiments, as Fig. 5, shown in Figure 6, when the output of control signal output circuit 40 connected optocoupler OT1-B, control signal output circuit 40 can omit diode D4 ', and promptly control signal output circuit 40 only adopts a resistance R 6.
The parameter of the resistance in the various embodiments described above, electric capacity, diode, operational amplifier, comparator integrated circuit can be determined to choose according to prior art.
As shown in Figure 6, constant-current source 110 is made of operational amplifier U4, current sense resistor RS1, voltage-reg-ulator tube Q1 and the capacitance resistance ware around it of tape base standard, the 3 pin output 2.5V reference voltage of operational amplifier U4.Constant-current source 120 is made of operational amplifier U3, current sense resistor RS2, voltage-reg-ulator tube Q2 and the capacitance resistance ware around it of tape base standard, the 3 pin output 2.5V reference voltage of operational amplifier U3.Constant-current source 110,120 is driving LED 2, LED1 respectively.
Claims (3)
1. a LED multichannel constant-current control circuit is characterized in that, comprises the voltage detecting circuit that connects successively, voltage reference circuit, signal comparator circuit and control signal output circuit;
Described voltage detecting circuit comprises the diode and the electric capacity 2 of resistance 1, respectively corresponding LED pipe or LED pipe group, described electric capacity 2 one end ground connection, the other end connect described resistance 1, the auxiliary power supply VCC of another termination prime constant pressure source of this resistance 1 or back level constant-current source, the positive terminal of described diode connects the link of described resistance 1 and described electric capacity 2 respectively, and the negative pole end of each described diode connects its corresponding LED pipe or LED pipe group;
Described voltage reference circuit comprises resistance 3, resistance 4 and electric capacity 3, and described electric capacity 3 is attempted by resistance 4 two ends, and described resistance 3 is connected in series the precision voltage reference of back resistance 4 end ground connection, resistance 3 termination prime constant pressure sources or back level constant-current circuit with resistance 4;
Described signal comparator circuit comprises electric capacity 4, electric capacity 5, resistance 5 and operational amplifier, two ends after described electric capacity 4 is attempted by described electric capacity 5 and resistance 5 is connected in series constitute negative feedback network, one end of this negative feedback network connects described operational amplifier output terminal, the other end connects the inverting input of described operational amplifier, the in-phase input end of described operational amplifier connects the described resistance 1 of described voltage detecting circuit and the link of described electric capacity 2, inverting input connects the described resistance 3 and resistance 4 series sides of described voltage reference circuit, or the inverting input of described operational amplifier connects the described resistance 1 of described voltage detecting circuit and the link of described electric capacity 2, in-phase input end connects the described resistance 3 and resistance 4 series sides of described voltage reference circuit;
Or described signal comparator circuit comprises diode 3, resistance 7 and comparator integrated circuit, described diode 3 constitutes the hysteresis circuit with two ends after resistance 7 is connected in series, positive pole one end of diode 3 connects the in-phase input end that described comparator ic output, this hysteresis circuit other end connect described comparator integrated circuit in this hysteresis circuit, and the described resistance 1 that the in-phase input end of described comparator integrated circuit connects described voltage detecting circuit is connected the described resistance 3 and resistance 4 series sides of described voltage reference circuit with link, the inverting input of described electric capacity 2;
Described control signal output circuit comprises resistance 6, and output, the other end that described resistance 6 one ends connect described operational amplifier or comparator integrated circuit are output.
2. LED multichannel constant-current control circuit as claimed in claim 1 is characterized in that: described control signal output circuit comprises diode 4, and described resistance 6 is connected in series with this diode 4; The described resistance 1 that connects described voltage detecting circuit when the in-phase input end of described operational amplifier is during with the link of described electric capacity 2, and the positive terminal of described diode 4 connects the output of described operational amplifier; The described resistance 1 that connects described voltage detecting circuit when the inverting input of described operational amplifier is during with the link of described electric capacity 2, and the negative pole end of described diode 4 connects the output of described operational amplifier; The described resistance 1 that connects described voltage detecting circuit when the in-phase input end of described comparator integrated circuit is during with the link of described electric capacity 2, and the positive terminal of described diode 4 connects the output of described comparator integrated circuit.
3. LED multichannel constant-current control circuit as claimed in claim 1 or 2, it is characterized in that: described voltage detecting circuit comprises electric capacity 1 and resistance 2, described electric capacity 1, resistance 2 and electric capacity 2 constitute the RC filter circuit, described electric capacity 1 and electric capacity 2 common grounds, described electric capacity 1 are connected the in-phase input end of described operational amplifier or the in-phase input end of reverse input end or described comparator integrated circuit with resistance 2 links.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205578180U CN201839487U (en) | 2010-10-12 | 2010-10-12 | LED multi-channel constant-current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205578180U CN201839487U (en) | 2010-10-12 | 2010-10-12 | LED multi-channel constant-current control circuit |
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| CN201839487U true CN201839487U (en) | 2011-05-18 |
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| CN2010205578180U Expired - Fee Related CN201839487U (en) | 2010-10-12 | 2010-10-12 | LED multi-channel constant-current control circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091543A (en) * | 2013-01-17 | 2013-05-08 | 深圳可立克科技股份有限公司 | Current detection circuit, constant current circuit and battery charging and discharging protective system |
| CN103891118A (en) * | 2011-09-17 | 2014-06-25 | 博朗有限公司 | DC converter with adjustable output voltage |
| CN105050280A (en) * | 2015-08-11 | 2015-11-11 | 苏州晶雷光电照明科技有限公司 | Drive circuit of light-emitting diode (LED) corridor lighting system |
-
2010
- 2010-10-12 CN CN2010205578180U patent/CN201839487U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103891118A (en) * | 2011-09-17 | 2014-06-25 | 博朗有限公司 | DC converter with adjustable output voltage |
| CN103091543A (en) * | 2013-01-17 | 2013-05-08 | 深圳可立克科技股份有限公司 | Current detection circuit, constant current circuit and battery charging and discharging protective system |
| CN105050280A (en) * | 2015-08-11 | 2015-11-11 | 苏州晶雷光电照明科技有限公司 | Drive circuit of light-emitting diode (LED) corridor lighting system |
| CN105050280B (en) * | 2015-08-11 | 2018-11-30 | 苏州晶雷光电照明科技有限公司 | The driving circuit of LED corridor illuminating system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN CLICK TECHNOLOGY CO., LTD. Free format text: FORMER NAME: CLICK TECHNOLOGY (SHENZHEN) LTD. |
|
| CP03 | Change of name, title or address |
Address after: 518000, Guangdong, Baoan District Fuyong Shenzhen Street Community in the middle of the bridge industrial plant 7, 1-5 storey factory building, 8, 2 Patentee after: Shenzhen Click Technology Limited Address before: 518000, Guangdong, Shenzhen, Baoan District Fuyong street, Qiaotou Industrial Park, 7 1-5 storey factory building, 8, 2 Patentee before: Click Technology (Shenzhen) Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110518 Termination date: 20161012 |