CN103874296A - LED constant-current driving circuit of multi-path self-adaptive loads - Google Patents
LED constant-current driving circuit of multi-path self-adaptive loads Download PDFInfo
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Abstract
The invention discloses an LED constant-current driving circuit of multi-path self-adaptive loads. The LED constant-current driving circuit comprises a booster circuit providing positive electrode driving voltage for LED string lamps, a control circuit, a closed loop constant-current mirror driving circuit and a sampling circuit. The closed loop constant-current mirror driving circuit comprises an operational amplifier, power MOS transistors and current limiting resistors R1. The output end of the booster circuit is connected with the positive electrodes of each path of LED string lamps, the negative electrodes of each path of LED string lamps are connected with a drain electrode of one corresponding power MOS transistor, the gate electrode of each power MOS transistor is connected with the output end of the operational amplifier, the source electrode of each power MOS transistor is grounded through one current limiting resistor R1, and one end, connected with the corresponding power MOS transistor, of each current limiting resistor R1 is connected with the reverse input end of the operational amplifier. The output end of the closed loop constant-current mirror driving circuit is connected with the sampling circuit, the control circuit is respectively connected with the sampling circuit and the booster circuit, and the control circuits controls the output voltage of the booster circuit according to the voltage value acquired by the sampling circuit. The LED constant-current driving circuit is high in constant-current precision and capable of automatically regulating the driving voltage and driving multiple paths of LED string lamps at the same time.
Description
Technical field
The present invention relates to LED Driving technique field, refer to particularly the LED constant-current drive circuit of multichannel self-adapting load.
Background technology
LED lamps etc. rely on the characteristics such as its life-span is long, reliable and stable, luminous efficiency is high, power consumption is little and the speed of lighting is fast to get more and more people's extensive concerning, LED lamp be considered to become versatility the 4th generation lighting source, LED drives as the indispensable part of LED product, directly affects life-span and the reliability of LED product.At present, LED drives general linear constant-current supply or the Switching Power Supply type of drive of adopting, linear constant-current power supply circuit is simple in structure, constant current accuracy is high, but it needs external circuit to provide one can meet the normal direct voltage that meets again power MOS pipe (transistor) luminous time and be operated in saturation region of LED, once given voltage has been fixed, the number of driving LED can not arbitrarily change; In addition, Switching Power Supply can self-adjusting output voltage, volume is little, but its constant current accuracy is low compared with linear power supply.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of LED constant-current drive circuit of multichannel self-adapting load, comprehensive utilization switch power source output voltage can be in harmonious proportion the high feature of linear constant-current supply constant output current precision, constant current simultaneously drives multi-way LED lamp string, and can automatically adjust driving voltage according to the number of LED lamp string LED lamp.
For achieving the above object, the LED constant-current drive circuit of the designed multichannel self-adapting load of the present invention, being included as LED lamp string provides the booster circuit of anodal driving voltage, control circuit, its special character is, also comprise Closed-loop Constant-current mirror drive circuit and sample circuit, described Closed-loop Constant-current mirror drive circuit comprises operational amplifier, power MOS pipe and current-limiting resistance R1 that number equates with the way of LED lamp string, the output of described booster circuit is connected with the anode of each paths of LEDs lamp string in LED lamp string group, the negative electrode of each paths of LEDs lamp string is connected with the drain electrode of a corresponding power MOS pipe respectively, the grid of described each power MOS pipe is connected with the output of operational amplifier, source electrode is through current-limiting resistance R1 ground connection, one end that described current-limiting resistance R1 is connected with the source electrode of power MOS pipe is connected with the reverse input end of operational amplifier, the output of described Closed-loop Constant-current mirror drive circuit is connected with sample circuit, described sample circuit gathers the drain electrode voltage to earth of power MOS pipe, described control circuit is connected with sample circuit, booster circuit respectively, and described control circuit is controlled the output voltage of booster circuit in real time according to the magnitude of voltage of sample circuit collection.
Further, described control circuit is current control mode control circuit.Current-mode control pattern has good dynamic adjustment characteristic with respect to voltage mode control, can ensure that booster circuit can disturb real-time adjustment output voltage according to the number of each LED lamp string LED or other.
Further, the output parallel modulation resistance R 4 of described booster circuit, the other end ground connection of described modulated resistance R4.When modulated resistance R4 is set can suppresses on the one hand underloading work, the drift phenomenon of circuit output, has overcome on the other hand circuit unloaded operation and has realized output open circuit protection.
Further, described sample circuit comprises sampling resistor R2 and R3 in parallel, described sampling resistor R2 is connected with one end of potential-divider network and the drain electrode of described power MOS pipe of R3 composition, other end ground connection, and the output of described sampling resistor R2 and R3 tie point is connected with control circuit.Sample circuit makes control circuit regulate in real time the output voltage of booster circuit to the magnitude of voltage sampling feedback of all power MOS pipe drain electrodes in Closed-loop Constant-current mirror drive circuit.
Further, described power MOS pipe is N channel enhancement metal-oxide-semiconductor.
The present invention is compared with the usefulness of prior art: constant current accuracy is high, can automatically regulate driving voltage and can drive multi-way LED lamp string simultaneously according to the number of LED load; Constant current drives the consistency that ensures each LED lamp string luminosity and colourity; Power MOS pipe and current-limiting resistance in Closed-loop Constant-current mirror drive circuit are carried out dividing potential drop real-time sampling and regulate the output voltage of booster circuit, make circuit there is the ability of self-adapting load; Circuit structure is simple, with low cost, and constant current accuracy is high.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the LED constant-current drive circuit of multichannel self-adapting load of the present invention;
Fig. 2 is that in Fig. 1, LED lamp string is the embodiment circuit diagram of eight strings;
In figure: 1. booster circuit, 2. control circuit, 3. Closed-loop Constant-current mirror drive circuit, 3-1. operational amplifier, 4.LED lamp string group, 5.LED lamp string group, Q1～Qn. power MOS pipe, R1. current-limiting resistance.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, the LED constant-current drive circuit of multichannel self-adapting load provided by the present invention, comprises booster circuit 1, control circuit 2, Closed-loop Constant-current mirror drive circuit 3 and sample circuit 4.Closed-loop Constant-current mirror drive circuit 3 comprises power MOS pipe Q1～Qn and the current-limiting resistance R1 that operational amplifier 3-1, number equate with the way of LED lamp string group 5.Sample circuit 4 comprises sampling resistor R2 and R3 in parallel.The output of booster circuit 1 is connected with the anode of each paths of LEDs lamp string 5-1～5-n in LED lamp string group 5, the negative electrode of each paths of LEDs lamp string 5-1～5-n is connected with the drain electrode of a corresponding power MOS pipe Q1～Qn respectively, the grid of each power MOS pipe Q1～Qn is connected with the output of operational amplifier 3-1, source electrode is through current-limiting resistance R1 ground connection, and the terminal voltage of current-limiting resistance R1 feeds back to the reverse input end of operational amplifier 3-1; The output of Closed-loop Constant-current mirror drive circuit 3 is connected with sample circuit 4, and control circuit 2 is connected with sample circuit 4, booster circuit 1 respectively.The output parallel modulation resistance R 4 of booster circuit 1, the other end ground connection of modulated resistance R4.Sampling resistor R2 is connected with the drain electrode of power MOS pipe Q1～Qn with one end of the potential-divider network of R3 composition, other end ground connection, and the output of sampling resistor R2 and R3 tie point is connected with control circuit 2.Control circuit 2 is sampled to the output voltage signal of Closed-loop Constant-current mirror drive circuit, controls in real time the output voltage of booster circuit 1 according to the collection signal of sample circuit 4.
Required anodal driving voltage when booster circuit 1 is mainly born LED lamp string group 5 and normally lit a lamp, booster circuit 1 can be adjusted output voltage (in LED lamp string group 5, the specification of each paths of LEDs lamp string 5-1～5-n is consistent with quantitative requirement) in real time automatically according to the quantity of each paths of LEDs lamp string 5-1～5-n in LED lamp string group 5; Closed-loop Constant-current mirror drive circuit 3 is the constant current mirror drive circuits based on linear constant-current drive circuit and current mirroring circuit structure, it is mainly used in providing the LED lamp string group 5 required constant drive current of normally lighting a lamp, because Closed-loop Constant-current mirror drive circuit 3 adopts the design of constant current mirror, the electric current that flows through each paths of LEDs lamp string 5-1～5-n can be consistent all the time; Control circuit 2 adopts current-mode control pattern to realize, known according to PWM feedback model, current-mode control pattern has good dynamic adjustment characteristic, can ensure that booster circuit 1 can disturb real-time adjustment output voltage according to the number of each paths of LEDs lamp string 5-1～5-n in LED lamp string group 5 or other.Closed-loop Constant-current mirror drive circuit 3 is realized based on linear constant-current drive circuit and current mirroring circuit, the drain-source current that makes to flow through power MOS pipe Q1～Qn all equates and equals n/mono-of Iset/R1, the drain electrode of power MOS pipe Q1～Qn connects respectively the negative electrode of a corresponding paths of LEDs lamp string 5-1～5-n, and the anode of each paths of LEDs lamp string 5-1～5-n is all connected with the output of booster circuit 1.After circuit operation, the output voltage of booster circuit 1 can raise gradually, control circuit 2 can carry out Real-Time Monitoring to LED lamp string group 5, when the sampled voltage that monitors a certain paths of LEDs lamp string 5-1～5-n sampled point reaches after preset value, and the Voltage-output of fixing booster circuit 1.
Output parallel modulation resistance R 4(dummy load with booster circuit 1 is set) there are two aspects to consider, the one, the drift phenomenon of circuit output while work in order to suppress underloading, is in order to overcome circuit unloaded operation and output open circuit protection to be provided on the other hand.The value of modulated resistance R4 can not be too small can not be excessive, if R4 choosing value is too small, will some output current directly through R4 to ground, understand like this increasing circuit output loss and reduce conversion efficiency; If R4 choosing value is excessive, it can not play the effect of stabilizing circuit output in the time that circuit underloading is worked.
The peripheral circuit of control circuit 2 mainly comprises current feedback network, oscillating circuit, slope compensation network and loop compensation network.Wherein Voltage Feedback network is responsible for the output voltage signal of Closed-loop Constant-current mirror drive circuit to sample, current feedback network is responsible for the situation of change of electric current in booster circuit 1 to sample, oscillating circuit offers frequency of oscillation and the maximum adjustable duty ratio that UC3842 is fixing, the acclivity of the current signal of slope compensation network to current feedback network collection compensates, and the effect of loop compensation network is the stability in order to improve system.
Fig. 2 is that LED lamp string of the present invention is the circuit embodiments of eight strings, has eight string LED lamp strings in LED lamp string group 5, and Closed-loop Constant-current mirror drive circuit 3 adopts the mode that linear constant current driving combines with current mirror to carry out constant current, current-sharing driving to eight paths of LEDs lamp string groups 5.Main circuit will comprise 1 operational amplifier, power Q1～the Q8 of 1 current-limiting resistance R1 and 8 same specifications, Q1～Q8 is the NMOS pipe of N channel enhancement, the drain electrode of each power MOS pipe Q1～Q8 is connected with the negative electrode of corresponding 1 paths of LEDs lamp string 5-1～5-8, grid interconnects and is connected with the output of operational amplifier 3-1, source electrode interconnects and is connected with current-limiting resistance R1, the terminal voltage of R1 feeds back to the reverse input end of operational amplifier 3-1, the electric current that flows through R1 is determined by the in-phase end input voltage of operational amplifier 3-1 and the ratio of current-limiting resistance R1, due to the connected mode of circuit employing current mirror, grid and the source electrode of each power MOS pipe Q1～Q8 all connect together, so flow through the electric current of each paths of LEDs lamp string 5-1～5-8 all equate and equal to flow through current-limiting resistance R1 electric current 1/8th.As shown in Figure 2, sampling resistor R2, R3 carry out dividing potential drop sampling to the voltage of eight power MOS pipe Q1～Q8 and current-limiting resistance R1 end, the real-time feedback voltage input that is sent to UC3842 and the relatively formation voltage error signal of reference voltage of voltage signal of sampling resistor R3 end, control circuit 2 carries out current sample to booster circuit 1 and sends into the feedback current input of UC3842 and compare generation pwm signal with voltage error signal the output voltage of booster circuit 1 is regulated in real time simultaneously.
The input voltage of sense circuit is 15V respectively, and in each LED lamp string group 5, the quantity of each paths of LEDs lamp string 5-1～5-8 is 10,20,30,40 and 50, and above-mentioned multichannel loading adaptive constant-flow drive circuit is carried out to associative simulation test.
Table 1 input voltage 15V circuit self-adapting load test data
Table 1 is the statistics of above emulation testing, can find out from data shown in table 1, in the time changing the quantity of LED lamp string 5-1～5-8 in each LED lamp string group 5, circuit can regulate the output voltage of booster circuit 1 automatically, and it is constant in 31.25mA all the time to flow through the electric current of each LED lamp string 5-1～5-8.
The input voltage of sense circuit is 20V respectively, and in each LED lamp string group 5, the quantity of each paths of LEDs lamp string 5-1～5-8 is 10,20,30,40 and 50, and above-mentioned multichannel loading adaptive constant-flow drive circuit is carried out to associative simulation test.
Table 2 input voltage 20V circuit self-adapting load test data
The test result of circuit output characteristic is as shown in table 2, and in the time changing the quantity of LED lamp string 5-1～5-8 in each LED lamp string group 5, circuit can regulate the output voltage of booster circuit 1 automatically, and it is constant in 31.25mA all the time to flow through the electric current of each LED lamp string 5-1～5-8.After circuit is stable, output voltage can fluctuate in a less scope, and output current is invariable all the time.
Test result shows, circuit can regulate driving voltage automatically according to the quantity of LED lamp string 5-1～5-8 in each LED lamp string group 5, and the fluctuation that the electric current that flows through each LED lamp string 5-1～5-8 is ignored output voltage remains at design load, designed circuit possesses the designing requirement of " constant current accuracy high, can automatically regulate driving voltage and can drive multi-way LED lamp string simultaneously according to the number of LED load ".
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also design some improvement, and these improve and also should be considered as protection scope of the present invention.
Claims (5)
1. the LED constant-current drive circuit of a multichannel self-adapting load, being included as LED lamp string (5) provides the booster circuit (1) of anodal driving voltage, control circuit (2), it is characterized in that: also comprise Closed-loop Constant-current mirror drive circuit (3) and sample circuit (4), described Closed-loop Constant-current mirror drive circuit (3) comprises operational amplifier (3-1), power MOS pipe (Q1～Qn) and current-limiting resistance R1 that number equates with the way of LED lamp string, the output of described booster circuit (1) is connected with the anode of each paths of LEDs lamp string (5-1～5-n) in LED lamp string group (5), the negative electrode of each paths of LEDs lamp string is connected with the drain electrode of a corresponding power MOS pipe (Q1～Qn) respectively, the grid of described each power MOS pipe (Q1～Qn) is connected with the output of operational amplifier (3-1), source electrode is through current-limiting resistance R1 ground connection, one end that described current-limiting resistance R1 is connected with the source electrode of power MOS pipe (Q1～Qn) is connected with the reverse input end of operational amplifier (3-1), the output of described Closed-loop Constant-current mirror drive circuit (3) is connected with sample circuit (4), described sample circuit (4) gathers the drain electrode voltage to earth of power MOS pipe (Q1～Qn), described control circuit (2) is connected with sample circuit (4), booster circuit (1) respectively, and the magnitude of voltage that described control circuit (2) gathers according to sample circuit (4) is controlled the output voltage of booster circuit (1) in real time.
2. the LED constant-current drive circuit of multichannel self-adapting load according to claim 1, is characterized in that: described control circuit (2) is current control mode control circuit.
3. the LED constant-current drive circuit of multichannel self-adapting load according to claim 1, is characterized in that: the output parallel modulation resistance R 4 of described booster circuit (1), the other end ground connection of described modulated resistance R4.
4. the LED constant-current drive circuit of multichannel self-adapting load according to claim 1, it is characterized in that: described sample circuit (4) comprises sampling resistor R2 and R3 in parallel, described sampling resistor R2 is connected with the drain electrode of described power MOS pipe (Q1～Qn) with one end of the potential-divider network of R3 composition, other end ground connection, the output of described sampling resistor R2 and R3 tie point is connected with control circuit (2).
5. the LED constant-current drive circuit of multichannel self-adapting load according to claim 1, is characterized in that: described power MOS pipe (Q1～Qn) is N channel enhancement metal-oxide-semiconductor.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106411129A (en) * | 2016-10-31 | 2017-02-15 | 黑龙江省电力科学研究院 | Peak-current-mode Buck circuit sub-harmonic oscillation elimination method based on slope compensation method |
| CN108541101A (en) * | 2018-04-10 | 2018-09-14 | 厦门元顺微电子技术有限公司 | The circuit structure of chip |
| CN109168236A (en) * | 2018-09-17 | 2019-01-08 | 四川鹏天科技发展有限公司 | High load stepless light-regulating controller and its light adjusting system of application |
| CN109269053A (en) * | 2018-09-14 | 2019-01-25 | 佛山市高科合创科技有限公司 | Constant-current drive circuit and air purifier for air cleaning exhausting system |
| CN109348581A (en) * | 2018-11-20 | 2019-02-15 | 华南理工大学 | A kind of four-way exchange driving chip circuit |
| CN109587883A (en) * | 2018-12-20 | 2019-04-05 | 厦门赢科光电有限公司 | A kind of apparatus and system that LED source is adaptive |
| CN109741711A (en) * | 2019-03-14 | 2019-05-10 | 武汉精立电子技术有限公司 | A kind of LED backlight adjusting circuit based on high-frequency PWM |
| CN113498234A (en) * | 2020-04-01 | 2021-10-12 | 炬芯科技股份有限公司 | MOS tube driving circuit and enhanced LED driving circuit |
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| CN109741711A (en) * | 2019-03-14 | 2019-05-10 | 武汉精立电子技术有限公司 | A kind of LED backlight adjusting circuit based on high-frequency PWM |
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| CN113498234B (en) * | 2020-04-01 | 2023-05-12 | 炬芯科技股份有限公司 | MOS tube driving circuit and enhanced LED driving circuit |
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Address after: 430070 Hubei City, Hongshan Province, South Lake Road, No. 53, Hongshan Venture Center, building on the 4 floor, No. Patentee after: Wuhan fine test electronics group Limited by Share Ltd Address before: 430070 Hubei City, Hongshan Province, South Lake Road, No. 53, Hongshan Venture Center, building on the 4 floor, No. Patentee before: Wuhan Jingce Electronic Technology Co., Ltd. |
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