CN102647820A - LED (light emitting diode) drive circuit - Google Patents
LED (light emitting diode) drive circuit Download PDFInfo
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- CN102647820A CN102647820A CN2011100403812A CN201110040381A CN102647820A CN 102647820 A CN102647820 A CN 102647820A CN 2011100403812 A CN2011100403812 A CN 2011100403812A CN 201110040381 A CN201110040381 A CN 201110040381A CN 102647820 A CN102647820 A CN 102647820A
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Abstract
The invention relates to an LED (light emitting diode) drive circuit which comprises a switching power supply, a rectification filtering module and a feedback control module, wherein the switching power supply is used for receiving alternating current input and adjusting an output voltage according to a pulse-width signal; the rectification filtering module is electrically connected with the switching power supply, and the output voltage is subjected to rectification filtering so as to be divided into two paths to be respectively output to an LED anode end and an LED cathode end; the feedback control module is divided into the two paths which are respectively connected with the LED anode end and the LED cathode end, is used for obtaining voltage variation conditions, and outputs a feedback signal to the switching power supply according to the voltage variation condition; and the switching power supply further adjusts the pulse-width signal according to the feedback signal. The LED drive circuit adopts a feedback control loop to adjust voltage output through the switching power supply, thereby achieving the purpose of stabilizing the voltage; and the realization device of the feedback control loop is simple, and the cost is lower.
Description
[technical field]
The present invention relates to LED and drive, especially relate to a kind of led drive circuit.
[background technology]
In traditional LED driver module based on commonplace components, the factor that influences the LED constant current generally comprises two: the one, and the power supply input is unstable, when input voltage changes in certain scope, must influence the electric current of LED, can't accomplish constant current; The 2nd, though stable input voltage is provided, when the LED load variations is that module parameter need be readjusted the operating current that just can meet LED again.
A method keeping LED constant current work is to adopt the constant current chip.The constant current chip is special-purpose integrated chip, and its cost is more much higher than general components and parts.Therefore use the cost of LED driver module of constant current chip higher, be not suitable for being used in the common application.
[summary of the invention]
Based on this, be necessary to provide a kind of led drive circuit cheaply, can adapt to the input of wide cut voltage.
A kind of led drive circuit comprises Switching Power Supply, rectification filtering module and feedback control module, and said Switching Power Supply is used for receiving the interchange input, adjusts output voltage according to pulse-width signal; Said rectification filtering module is electrically connected with Switching Power Supply, and said output voltage is carried out dividing two-way to output to LED anode tap and LED cathode terminal respectively behind the rectifying and wave-filtering; Said feedback control module divides two-way to be connected respectively to LED anode tap and LED cathode terminal, is used to gather the state information of LED anode tap and LED cathode terminal, and arrives Switching Power Supply according to said state information output feedback signal; Said Switching Power Supply is further according to said feedback signal adjustment pulse-width signal.
Preferably; Said rectification filtering module comprises transformer, Schottky diode, filter inductance and filter capacitor; Said transformer is connected with said Switching Power Supply; Said transformer secondary output coil two ends are connected with the LED cathode terminal with the anode of said Schottky diode respectively, and the negative electrode of said Schottky diode is connected with said filter inductance, and is connected to the LED anode tap through said filter inductance; The two ends of said filter capacitor connect the negative electrode and the LED cathode terminal of said Schottky diode respectively, and said filter capacitor connects an end ground connection of LED cathode terminal.
Preferably; Said feedback control module comprises protective resistance, optical coupling chip and pressure regulation feedback circuit; Said optical coupling chip comprises photophore and light-receiving device; Said protective resistance is connected between the input of photophore of LED anode tap and optical coupling chip, and the input of said light-receiving device, output are connected in the two ends of Switching Power Supply; Said pressure regulation feedback circuit comprises first operational amplifier, first sampling resistor, first divider resistance, first feedback resistance, first feedback capacity, first diode; Be connected in series said first divider resistance and first sampling resistor successively between said LED anode tap and the ground, the common port of said first sampling resistor and first divider resistance is connected with the inverting input of said first operational amplifier; Said first feedback resistance and first feedback capacity are connected between the inverting input and output of said first operational amplifier; Said first diode anode connects the output of said photophore, and said first diode cathode connects the output of said first operational amplifier; The in-phase input end of said first operational amplifier is imported first reference voltage.
Preferably; Said led drive circuit also comprises sample resistance; Said feedback control module also comprises the accent current feedback circuit; Said sample resistance is serially connected with between the end and LED cathode terminal of said filter capacitor ground connection, and said accent current feedback circuit comprises second operational amplifier, second divider resistance, second feedback resistance, second feedback capacity and second diode; Said second divider resistance is connected between the reverse input end of said LED cathode terminal and said second operational amplifier; Said second feedback resistance and second feedback capacity are connected between the inverting input and output of said second operational amplifier, and the reverse inter-input-ing ending grounding of said second operational amplifier; Said second diode anode connects said light-emitting diodes tube cathode, and said second diode cathode connects the output of said second operational amplifier; The in-phase input end of said second operational amplifier is imported second reference voltage.
Preferably, said photophore is a light-emitting diode, and said light-receiving device is a phototriode.
Preferably; Said feedback control module comprises integrated chip AP4310, protective resistance and optical coupling chip; Said optical coupling chip illuminator and light-receiving device; Said protective resistance is connected between the input of photophore of LED anode tap and optical coupling chip, and the input of said light-receiving device, output are connected in the two ends of Switching Power Supply, and said protective resistance is connected between the input of photophore of LED anode tap and optical coupling chip; And the output of said photophore is connected with first diode anode, and said first diode cathode is connected to 1 pin of integrated chip AP4310; Be connected in series first feedback resistance and first feedback capacity between 1 pin of said integrated chip AP4310 and 2 pin; Said first sampling resistor and first divider resistance are connected between LED anode tap and the LED cathode terminal; And first sampling resistor is connected with the LED cathode terminal, and the common port of said first sampling resistor and first divider resistance is connected with 2 pin of integrated chip AP4310; The 4 pin ground connection of integrated chip AP4310; 5 pin of integrated chip AP4310 connect the common port of the 3rd divider resistance and reference resistance, reference resistance other end ground connection; Second feedback resistance and second feedback capacity are serially connected between 6 pin and 7 pin of integrated chip AP4310 and the 6 pin ground connection of integrated chip AP4310; Second feedback resistance and second feedback capacity are serially connected between 6 pin and 7 pin of integrated chip AP4310, and 6 pin of integrated chip AP4310 are connected to the LED cathode terminal through second divider resistance; 8 pin of integrated chip AP4310 connect the driving power of 15V, and driving power also is connected with 3 pin of integrated chip AP4310 through resistance simultaneously, and then is connected with the 3rd divider resistance.
Preferably, said photophore is a light-emitting diode, and said light-receiving device is a phototriode.
Above-mentioned led drive circuit adopts feedback control loop to come can reach the purpose of burning voltage, and the realization device of feedback control loop to be simple through the output of Switching Power Supply adjustment voltage, and cost is lower.
[description of drawings]
Fig. 1 is the module map of the led drive circuit of an embodiment;
Fig. 2 is the circuit structure diagram of the led drive circuit of an embodiment;
Fig. 3 is the circuit structure diagram of the led drive circuit of another embodiment;
Fig. 4 is the circuit structure diagram of the led drive circuit of another embodiment.
[embodiment]
As shown in Figure 1, be the functional block diagram of the led drive circuit of an embodiment.This led drive circuit comprises Switching Power Supply 100, rectification filtering module 200 and feedback control module 300.
(Switched-Mode Power Supply SMPS) 100 is used for receive exchanging input, according to pulse-width modulation (PWM) signal adjustment output voltage to Switching Power Supply.Switching Power Supply 100 inside mainly comprise pwm signal control integrated circuit and metal-oxide-semiconductor, and the control of pwm signal control integrated circuit is input to the duty ratio of the pwm signal of metal-oxide-semiconductor grid, the time ratio of control metal-oxide-semiconductor conducting and shutoff, thereby adjustment output voltage.The pwm signal control integrated circuit is connected with extraneous circuit by external interface usually, like the optical coupling input interface.To the pwm signal control integrated circuit, the pwm signal control integrated circuit is according to the duty ratio of feedback signal adjustment pwm signal through above-mentioned external interface input feedback signal for external circuitry.
300 fens two-way of feedback control module are connected respectively to LED anode tap and LED cathode terminal, are used to gather the state information of LED anode tap and LED cathode terminal, and arrive Switching Power Supply 100 according to said state information output feedback signal; Switching Power Supply 100 is further according to this feedback signal adjustment pwm signal.
Particularly, for adapting to the input of wide cut voltage, as shown in Figure 2, feedback control module 300 comprises protective resistance R4, optical coupling chip U2 and pressure regulation feedback circuit 310.Optical coupling chip U2 comprises photophore and light-receiving device; Protective resistance R4 is connected between the input of photophore of LED anode tap and optical coupling chip U2; Photophore and light-receiving device coupling among the optical coupling chip U2, light-receiving device feeds back to feedback signal the optical coupling input of Switching Power Supply 100.Photophore such as light-emitting diode, light-receiving device such as phototriode.
Pressure regulation feedback circuit 310 comprises the first operational amplifier U1, the first sampling resistor R1, the first divider resistance R2, the first feedback resistance R3, the first feedback capacity C1, the first diode D1.
Be connected in series the first divider resistance R2 and the first sampling resistor R1 successively between LED anode tap and the ground, the common port of the first sampling resistor R1 and the first divider resistance R2 is connected with the inverting input of the first operational amplifier U1.
The first feedback resistance R3 and the first feedback capacity C1 are connected between the inverting input and output of the first operational amplifier U1.
The first diode D1 anode connects the output of photophore among the optical coupling chip U2, and the first diode D1 negative electrode connects the output of the first operational amplifier U1.
The in-phase input end input reference voltage of the first operational amplifier U1.
Above-mentioned led drive circuit, it is 2.5V that reference voltage is set, this reference voltage can be provided by TL431.When the interchange input of Switching Power Supply 100 changes, can cause that the voltage of LED anode tap changes.The change in voltage of LED anode tap can make the voltage of the dividing point between the first sampling resistor R1 and the first divider resistance R2 change, and makes its magnitude of voltage that departs from 2.5V, i.e. the voltage deviation 2.5V of the reverse input end of the first operational amplifier U1.
Particularly; When the voltage of the reverse input end of the first operational amplifier U1 is higher than 2.5V; Relatively amplify through the first operational amplifier U1; The output current potential of the first operational amplifier U1 reduces, and then increases through the electric current of photophore among the optical coupling chip U2, and the feedback signal that this electric current increases inputs to the optical coupling input of Switching Power Supply 100.Switching Power Supply 100 reduces output voltage according to the duty ratio of this feedback signal adjustment pwm signal.
In like manner, when the voltage of the reverse input end of the first operational amplifier U1 was lower than 2.5V, output voltage can be raise by adjustment.
Further, as shown in Figure 3 for adapting to the load variations under burning voltage, feedback control module 300 also comprises sample resistance R7 and transfers current feedback circuit 320.Sample resistance R7 is serially connected with between the end and LED cathode terminal of filter capacitor C3 ground connection.Transfer current feedback circuit 320 to comprise the second operational amplifier U3, the second divider resistance R5, the second feedback resistance R6, the second feedback capacity C2 and the second diode D2.
The second divider resistance R5 is connected between the inverting input of the LED cathode terminal and the second operational amplifier U3.
The second feedback resistance R6 and the second feedback capacity C2 are connected between the inverting input and output of the second operational amplifier U3.
The second diode D2 anode connects the output of photophore, and the second diode D2 negative electrode connects the output of the second operational amplifier U3.
The constant current control principle is following: the electric current that sample resistance R7 is flow through the time in LED work enters into the in-phase input end of the second operational amplifier U3 through R5, when the electric current I of the LED that flows through
FDuring rising, the voltage drop V of sample resistance R7
GND=I
F* R7 increases; The voltage of the in-phase input end of the second operational amplifier U3 rises synchronously so, and through comparing with the reference voltage that the in-phase input end of the second operational amplifier U3 is imported, the output end voltage of the second operational amplifier U3 then reduces; The electric current of photophore is increased; Be coupled to light-receiving device again, signal feedback to Switching Power Supply (SMPS) 100 is removed to adjust pwm signal, finally make the I of LED
FRevert to former design current, promptly realize constant current; With I that should LED
FPressure drop when electric current reduces on the R7 diminishes; Cause the voltage decreases to the inverting input of the second operational amplifier U3 through R5; The output end voltage of the second operational amplifier U3 increases, and optocoupler LED electric current is reduced, and is coupled to light-receiving device again; (SMPS) removes to adjust pwm signal with signal feedback to Switching Power Supply, finally makes I
FElectric current reverts to intrinsic steady state value, promptly realizes constant current.
Above-mentioned pressure regulation feedback circuit 310 all need be used reference voltage with accent current feedback circuit 320, and in order to the criterion as adjusting, reference voltage can adopt the access constant-voltage device to realize, like TL431.TL431 provides the 2.5V output of standard, according to required reference voltage, can adopt the dividing potential drop mode that higher or lower normal voltage output is provided.
As shown in Figure 4, be the led drive circuit of another embodiment.In this drive circuit, available integrated chip AP4310 replaces two operational amplifiers and the reference voltage source in the foregoing description.Wherein,
Protective resistance R4 is connected between the input of photophore of LED anode tap and optical coupling chip U2, and the output of photophore is connected with the first diode D1 anode, and the first diode D1 negative electrode is connected to 1 pin of integrated chip AP4310.
Be connected in series the first feedback resistance R3 and the first feedback capacity C1 between 1 pin of integrated chip AP4310 and 2 pin; The first sampling resistor R1 and the first divider resistance R2 be connected on successively and the LED anode tap between, the common port of the first sampling resistor R1 and the first divider resistance R2 is connected with 2 pin of integrated chip AP4310.
The 4 pin ground connection of integrated chip AP4310.
5 pin of integrated chip AP4310 connect the common port of the 3rd divider resistance R9 and reference resistance R10, the other end ground connection of reference resistance R10.
The second feedback resistance R6 and the second feedback capacity C2 are serially connected between 6 pin and 7 pin of integrated chip AP4310, and 6 pin of integrated chip AP4310 are connected to the LED cathode terminal through the second divider resistance R5.
The second diode D2 anode is connected with the output of the photophore of optical coupling chip U2, and the negative electrode of the second diode D2 is connected with 7 pin of integrated chip AP4310.
8 pin of integrated chip AP4310 connect the driving power of 15V, and driving power also is connected with 3 pin of integrated chip AP4310 through resistance R 8 simultaneously, and then is connected with the 3rd divider resistance R9.
Integrated chip AP4310 inside has reference voltage, is the reference voltage that 3 pin provide 2.5V, also is that 5 pin provide 2.5 [R10/ (R9+R10)] reference voltage of V simultaneously.
The above embodiment has only expressed several kinds of execution modes of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, 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 accompanying claims.
Claims (7)
1. a led drive circuit is characterized in that, comprises Switching Power Supply, rectification filtering module and feedback control module,
Said Switching Power Supply is used for receiving the interchange input, adjusts output voltage according to pulse-width signal;
Said rectification filtering module is electrically connected with Switching Power Supply, and said output voltage is carried out dividing two-way to output to LED anode tap and LED cathode terminal respectively behind the rectifying and wave-filtering;
Said feedback control module divides two-way to be connected respectively to LED anode tap and LED cathode terminal, is used to gather the state information of LED anode tap and LED cathode terminal, and arrives Switching Power Supply according to said state information output feedback signal;
Said Switching Power Supply is further according to said feedback signal adjustment pulse-width signal.
2. led drive circuit as claimed in claim 1; It is characterized in that; Said rectification filtering module comprises transformer, Schottky diode, filter inductance and filter capacitor, and said transformer is connected with said Switching Power Supply, and said transformer secondary output coil two ends are connected with the LED cathode terminal with the anode of said Schottky diode respectively; The negative electrode of said Schottky diode is connected with said filter inductance; And be connected to the LED anode tap through said filter inductance, and the two ends of said filter capacitor connect the negative electrode and the LED cathode terminal of said Schottky diode respectively, and said filter capacitor connects an end ground connection of LED cathode terminal.
3. led drive circuit as claimed in claim 2; It is characterized in that; Said feedback control module comprises protective resistance, optical coupling chip and pressure regulation feedback circuit; Said optical coupling chip comprises photophore and light-receiving device, and said protective resistance is connected between the input of photophore of LED anode tap and optical coupling chip, and the input of said light-receiving device, output are connected in the two ends of Switching Power Supply;
Said pressure regulation feedback circuit comprises first operational amplifier, first sampling resistor, first divider resistance, first feedback resistance, first feedback capacity, first diode;
Be connected in series said first divider resistance and first sampling resistor successively between said LED anode tap and the ground, the common port of said first sampling resistor and first divider resistance is connected with the inverting input of said first operational amplifier;
Said first feedback resistance and first feedback capacity are connected between the inverting input and output of said first operational amplifier;
Said first diode anode connects the output of said photophore, and said first diode cathode connects the output of said first operational amplifier;
The in-phase input end of said first operational amplifier is imported first reference voltage.
4. led drive circuit as claimed in claim 3; It is characterized in that; Said led drive circuit also comprises sample resistance; Said feedback control module also comprises the accent current feedback circuit, and said sample resistance is serially connected with between the end and LED cathode terminal of said filter capacitor ground connection, and said accent current feedback circuit comprises second operational amplifier, second divider resistance, second feedback resistance, second feedback capacity and second diode;
Said second divider resistance is connected between the reverse input end of said LED cathode terminal and said second operational amplifier;
Said second feedback resistance and second feedback capacity are connected between the inverting input and output of said second operational amplifier, and the reverse inter-input-ing ending grounding of said second operational amplifier;
Said second diode anode connects said light-emitting diodes tube cathode, and said second diode cathode connects the output of said second operational amplifier;
The in-phase input end of said second operational amplifier is imported second reference voltage.
5. like claim 3 or 4 described led drive circuits, it is characterized in that said photophore is a light-emitting diode, said light-receiving device is a phototriode.
6. led drive circuit as claimed in claim 1; It is characterized in that; Said feedback control module comprises integrated chip AP4310, protective resistance and optical coupling chip, said optical coupling chip illuminator and light-receiving device, and said protective resistance is connected between the input of photophore of LED anode tap and optical coupling chip; The input of said light-receiving device, output are connected in the two ends of Switching Power Supply
Said protective resistance is connected between the input of photophore of LED anode tap and optical coupling chip, and the output of said photophore is connected with first diode anode, and said first diode cathode is connected to 1 pin of integrated chip AP4310;
Be connected in series first feedback resistance and first feedback capacity between 1 pin of said integrated chip AP4310 and 2 pin; Said first sampling resistor and first divider resistance are connected between LED anode tap and the LED cathode terminal; And first sampling resistor is connected with the LED cathode terminal, and the common port of said first sampling resistor and first divider resistance is connected with 2 pin of integrated chip AP4310;
The 4 pin ground connection of integrated chip AP4310;
5 pin of integrated chip AP4310 connect the common port of the 3rd divider resistance and reference resistance, reference resistance other end ground connection;
Second feedback resistance and second feedback capacity are serially connected between 6 pin and 7 pin of integrated chip AP4310 and the 6 pin ground connection of integrated chip AP4310;
Second feedback resistance and second feedback capacity are serially connected between 6 pin and 7 pin of integrated chip AP4310, and 6 pin of integrated chip AP4310 are connected to the LED cathode terminal through second divider resistance;
8 pin of integrated chip AP4310 connect the driving power of 15V, and driving power also is connected with 3 pin of integrated chip AP4310 through resistance simultaneously, and then is connected with the 3rd divider resistance.
7. led drive circuit as claimed in claim 6 is characterized in that, said photophore is a light-emitting diode, and said light-receiving device is a phototriode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100403812A CN102647820A (en) | 2011-02-18 | 2011-02-18 | LED (light emitting diode) drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100403812A CN102647820A (en) | 2011-02-18 | 2011-02-18 | LED (light emitting diode) drive circuit |
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| CN102647820A true CN102647820A (en) | 2012-08-22 |
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| CN2011100403812A Pending CN102647820A (en) | 2011-02-18 | 2011-02-18 | LED (light emitting diode) drive circuit |
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| CN103002637A (en) * | 2012-10-31 | 2013-03-27 | 芜湖崧欣电子科技有限公司 | LED constant current detection circuit and LED constant current drive circuit |
| CN103037574A (en) * | 2012-11-28 | 2013-04-10 | 余姚亿威电子科技有限公司 | Feedback circuit for drive circuit of light-emitting diode (LED) |
| CN103716946A (en) * | 2012-09-29 | 2014-04-09 | 深圳市海洋王照明工程有限公司 | LED constant-current drive circuit |
| CN104768269A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Locomotive lamp driving circuit with lighting and signals |
| CN106535390A (en) * | 2016-10-09 | 2017-03-22 | 深圳创维－Rgb电子有限公司 | Constant current driving power supply and display equipment |
| CN107396500A (en) * | 2017-08-28 | 2017-11-24 | 盐城莱廷绍工业技术有限公司 | A kind of programmable a variety of electric current output LED drive circuits |
| CN107592702A (en) * | 2017-09-18 | 2018-01-16 | 佛山市国星光电股份有限公司 | A kind of power conditioning circuitry and LED drive device |
| CN109213244A (en) * | 2014-07-17 | 2019-01-15 | 克兰电子公司 | Dynamic for multiple control models in unified servo-system manipulates configuration |
| CN109862661A (en) * | 2019-02-22 | 2019-06-07 | 欧普照明股份有限公司 | A kind of power-supply controller of electric, connection load circuit and lamps and lanterns |
| CN110264968A (en) * | 2019-05-14 | 2019-09-20 | 昆山龙腾光电有限公司 | Signal generating circuit |
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| CN103716946A (en) * | 2012-09-29 | 2014-04-09 | 深圳市海洋王照明工程有限公司 | LED constant-current drive circuit |
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| CN106535390B (en) * | 2016-10-09 | 2018-07-31 | 深圳创维－Rgb电子有限公司 | Constant-current driving power supply and display equipment |
| CN107396500A (en) * | 2017-08-28 | 2017-11-24 | 盐城莱廷绍工业技术有限公司 | A kind of programmable a variety of electric current output LED drive circuits |
| CN107592702A (en) * | 2017-09-18 | 2018-01-16 | 佛山市国星光电股份有限公司 | A kind of power conditioning circuitry and LED drive device |
| CN107592702B (en) * | 2017-09-18 | 2024-04-09 | 佛山市国星光电股份有限公司 | Power regulating circuit and LED lamp driving device |
| CN109862661A (en) * | 2019-02-22 | 2019-06-07 | 欧普照明股份有限公司 | A kind of power-supply controller of electric, connection load circuit and lamps and lanterns |
| CN110264968A (en) * | 2019-05-14 | 2019-09-20 | 昆山龙腾光电有限公司 | Signal generating circuit |
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Application publication date: 20120822 |