CN101080126A - High-power LED driving circuit - Google Patents
High-power LED driving circuit Download PDFInfo
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- CN101080126A CN101080126A CNA2007100418173A CN200710041817A CN101080126A CN 101080126 A CN101080126 A CN 101080126A CN A2007100418173 A CNA2007100418173 A CN A2007100418173A CN 200710041817 A CN200710041817 A CN 200710041817A CN 101080126 A CN101080126 A CN 101080126A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
This invention relates to a high power LED drive circuit including a sampling resistor, a by-pass filtration condenser, a regulation condenser of oscillation frequency, a drive IC, a quick resuming diode and an energy-stored inductor, in which, said sampling resistor, the by-pass filtration condenser and the regulation condenser of oscillation frequency are all connected with the input of the drive IC, said quick resuming diode and the energy-stored inductor are connected with the output of the drive IC.
Description
Technical field
The present invention relates to semiconductor integrated circuit, particularly relate to a kind of high-power LED driving circuit.
Background technology
Along with the widespread usage of high-capacity LED in light decoration, general lighting and automobile LED floor light, the power-type LED drive circuit seems more and more important.In addition, LED is as a kind of light emitting semiconductor device of current mode, and its luminous intensity has the electric current that flows through LED to determine, so driving LED needs a kind of power supply of constant current.Existing high-power LED driving circuit is realized simple, but because its pulse width modulation of adopting (PWM) need be carried out meticulous network building out design to the sampling feedback signal that obtains from power circuit.The parameter of this compensation circuit is subjected to the parameter of integrated circuit (IC) inner parameter and power electric furnace and the layout and the effects of distribution parameters of printed circuit board (PCB), and along with the raising of operating frequency, this design becomes more and more difficult.Not only make the cost of IC itself and the cost of peripheral components and parts improve the stability decreases that also makes large-scale production.The power supply adaptive capacity of existing high-power LED driving circuit is poor in addition, and circuit itself is hot easily, easily cause LED to damage, and the whole efficiency of system is very low.
Summary of the invention
Purpose of the present invention is exactly to provide the high-power LED driving circuit that a kind of cost is low, simple in structure, stability is high for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions: a kind of high-power LED driving circuit, it is characterized in that, comprise sampling resistor, bypass filter capacitor, frequency of oscillation adjustment electric capacity, drive IC, fast recovery diode, energy storage inductor, described sampling resistor, bypass filter capacitor, frequency of oscillation are adjusted electric capacity and all are connected with the input of drive IC, and described fast recovery diode, energy storage inductor all are connected with the output of drive IC.
One end of described sampling resistor is connected with the external power supply of drive IC, its other end is connected with the peak current sampling end of drive IC, one end of described bypass filter capacitor is connected with external power supply, its other end is connected with the earth terminal of drive IC, the end that described frequency of oscillation is adjusted electric capacity is connected with the frequency of oscillation adjustment end of drive IC, its other end is connected with the earth terminal of drive IC, one end of described fast recovery diode is connected with the drive signal output of drive IC, its other end is connected with the earth terminal of drive IC, described energy storage inductor is connected with the drive signal output of drive IC, and its other end is connected with the earth terminal of drive IC with LED lamp series connection back.
Described drive IC comprises reference voltage source unit, soft start and RC filter unit, voltage-controlled oscillator, sample-offset voltage cell, current comparator, Pwm controller, driver element, high power transistor switch.
Described reference voltage source unit, soft start is connected with the input one of Pwm controller with RC filter unit series connection back, described frequency of oscillation is adjusted electric capacity and is connected with the input of voltage-controlled oscillator through the frequency of oscillation adjustment end of drive IC, the output of this voltage-controlled oscillator is connected with the input of Pwm controller two, the power supply VCC input of one end of described sample-offset voltage cell and drive IC, its other end is connected with the input one of current comparator, the peak current sampling end that passes through drive IC of described sampling resistor is connected with the input two of current comparator, the output of described current comparator is connected with the input of Pwm controller three, the output of described Pwm controller is connected with driver element, this driver element is connected with the input of high power transistor switch, the drive signal output of its output by drive IC respectively with fast recovery diode, energy storage inductor connects.
Described high power transistor switch adopts Darlington transistor switch or MOS type switch with field-effect transistors.
Compared with prior art, the present invention has efficient height, little, the long service life of consumption heating, the frequency of its pulse and duty ratio can be regulated, whole drive circuit is an open loop control structure, avoided in the existing LED closed loop driving control system causing system's problem of unstable when unreasonable, made the user feel convenient easy-to-use because peripheral cell is provided with.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Wherein: 1-reference voltage source unit, 2-soft start and RC filter unit, the 3-voltage-controlled oscillator, 4-sample-offset voltage cell, 5-current comparator, the 6-Pwm controller, the 7-driver element, 8-high power transistor switch, 9-power supply VCC input, 10-peak current sampling end, 11-frequency of oscillation adjustment end, 12-drive signal output, 13-earth terminal, the 14-sampling resistor, 15-bypass filter capacitor, the 16-frequency of oscillation is adjusted electric capacity, 17-fast recovery diode, the 18-energy storage inductor, the 19-LED lamp.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of high-power LED driving circuit, comprise sampling resistor, bypass filter capacitor, frequency of oscillation adjustment electric capacity, drive IC, fast recovery diode, energy storage inductor, described sampling resistor, bypass filter capacitor, frequency of oscillation are adjusted electric capacity and all are connected with the input of drive IC, and described fast recovery diode, energy storage inductor all are connected with the output of drive IC.
One end of described sampling resistor is connected with the external power supply of drive IC, its other end is connected with the peak current sampling end of drive IC, one end of described bypass filter capacitor is connected with external power supply, its other end is connected with the earth terminal of drive IC, the end that described frequency of oscillation is adjusted electric capacity is connected with the frequency of oscillation adjustment end of drive IC, its other end is connected with the earth terminal of drive IC, one end of described fast recovery diode is connected with the drive signal output of drive IC, its other end is connected with the earth terminal of drive IC, described energy storage inductor is connected with the drive signal output of drive IC, and its other end is connected with the earth terminal of drive IC with LED lamp series connection back; Described drive IC comprises reference voltage source unit, soft start and RC filter unit, voltage-controlled oscillator, sample-offset voltage cell, current comparator, Pwm controller, driver element, high power transistor switch; Described reference voltage source unit, soft start is connected with the input one of Pwm controller with RC filter unit series connection back, described frequency of oscillation is adjusted electric capacity and is connected with the input of voltage-controlled oscillator through the frequency of oscillation adjustment end of drive IC, the output of this voltage-controlled oscillator is connected with the input of Pwm controller two, the power supply VCC input of one end of described sample-offset voltage cell and drive IC, its other end is connected with the input one of current comparator, the peak current sampling end that passes through drive IC of described sampling resistor is connected with the input two of current comparator, the output of described current comparator is connected with the input of Pwm controller three, the output of described Pwm controller is connected with driver element, this driver element is connected with the input of high power transistor switch, the drive signal output of its output by drive IC respectively with fast recovery diode, energy storage inductor connects; Described high power transistor switch adopts Darlington transistor switch or MOS type switch with field-effect transistors.
Present embodiment provides a kind of voltage-dropping type high-power LED driving circuit, comprises drive IC, energy storage inductor, fast recovery diode, bypass filter capacitor and frequency of oscillation adjustment electric capacity; Inductance is added between the switch output pin and LED of drive IC, and the bypass filter capacitor is connected between the input voltage pin and ground of drive IC.Whole high-power LED driving circuit is open-loop control system, has avoided in the existing LED closed loop driving control system causing system's problem of unstable because peripheral cell is provided with when unreasonable, makes the user feel convenient easy-to-use.Built-in pulse width modulation of core drive IC (PWM) and high power transistor switch only need five exterior parts.To between 40V, the highest drive current reaches 1.5 amperes to this drive circuit input service voltage, can drive the high-capacity LED of 24W at 4V.Operating frequency can reach 200KHz by external capacitive control, as long as adjust the purpose that the external electric resistance can reach the change output current.
Present embodiment adopts Buck (voltage-dropping type) topology.Be drive IC in the black box among Fig. 1.Peripheral power supply input bypass filter capacitor C
IN(15) keep input voltage and filtering switching noise; Fast recovery diode has higher reverse recovery current to flow through, and plays the afterflow effect; Operating frequency can be by external capacitive C
T(16) control can reach 200KHz.Flow through the peak current I of LED
PKProvide by following formula:
In side circuit, for using conveniently, built-in sample-offset voltage is made as 300mV, flow through of the peak-to-peak value electric current decision of the average current of LED by inductance L, suppose that it is 550mA that desire is set the average current that flows through LED, ripple current is 100mA, and sampling resistor Rsense (14) can draw according to formula so:
Inductance L is storage power when the high power transistor switch conduction, by fast recovery diode energy discharge is gone to LED when the high power transistor switch cuts out then.Bigger inductance L value can guarantee system works in continuous conduction mode, and choosing of inductance value can be adopted following common recognition approximate calculation:
, V in the formula
LEDBe total forward voltage V of LED lamp string
RSENSEBe built-in sample-offset voltage, generally be set at 300mV, V
SATBe the saturation voltage drop of high-power switching transistor, owing to adopt darlington structure, this compound transistorized saturation voltage drop is approximately 1.0V.
The drive IC of present embodiment comprises Voltage Reference unit 1 in sequential series, soft start and RC filtering 2, oscillator 3, built-in sample-offset voltage 4, current comparator 5, PWM controller 6, drive controlling 7 and Darlington transistor switch 8 compositions.Mild voltage ripple is exported in the output of reference voltage after soft start and RC filtering; this mild voltage ripple can reduce the surge current of the electric current on the inductance L in power supply electrifying or the power supply dither process; thereby the reduction noise, and protection when supply voltage is shaken significantly to the impact of drive IC.By external capacitor C T (16), can obtain the oscillator signal of an amplitude limit, the high level amplitude of oscillator signal is determined by reference voltage.Oscillator signal is modulated into pwm control signal through the PWM controller and comes Control Driver.As mentioned above, average current on the LED is provided with by external Rsense resistance, amplifier 5 is also delivered to the PWM controller to electric current restriction comparison signal, and by controller make the Darlington switching transistor carry out conducting and by switching manipulation, and then on drive signal output 12, produce switch output signal, this signal butts up against the output inductance L and discharges and recharges operation, and finally in order to the driving LED lamp, be readily appreciated that, drive current on LED also is a pulse current, so drive IC is come driving LED in the mode of an average current.
The Darlington switching transistor of present embodiment can change MOS execution ground effect transistor or external and the short pin in increase drive IC shutdown pass or the like into.
Claims (5)
1. high-power LED driving circuit, it is characterized in that, comprise sampling resistor, bypass filter capacitor, frequency of oscillation adjustment electric capacity, drive IC, fast recovery diode, energy storage inductor, described sampling resistor, bypass filter capacitor, frequency of oscillation are adjusted electric capacity and all are connected with the input of drive IC, and described fast recovery diode, energy storage inductor all are connected with the output of drive IC.
2. a kind of high-power LED driving circuit according to claim 1, it is characterized in that, one end of described sampling resistor is connected with the external power supply of drive IC, its other end is connected with the peak current sampling end of drive IC, one end of described bypass filter capacitor is connected with external power supply, its other end is connected with the earth terminal of drive IC, the end that described frequency of oscillation is adjusted electric capacity is connected with the frequency of oscillation adjustment end of drive IC, its other end is connected with the earth terminal of drive IC, one end of described fast recovery diode is connected with the drive signal output of drive IC, its other end is connected with the earth terminal of drive IC, described energy storage inductor is connected with the drive signal output of drive IC, and its other end is connected with the earth terminal of drive IC with LED lamp series connection back.
3. a kind of high-power LED driving circuit according to claim 1, it is characterized in that described drive IC comprises reference voltage source unit, soft start and RC filter unit, voltage-controlled oscillator, sample-offset voltage cell, current comparator, Pwm controller, driver element, high power transistor switch.
4. a kind of high-power LED driving circuit according to claim 3, it is characterized in that, described reference voltage source unit, soft start is connected with the input one of Pwm controller with RC filter unit series connection back, described frequency of oscillation is adjusted electric capacity and is connected with the input of voltage-controlled oscillator through the frequency of oscillation adjustment end of drive IC, the output of this voltage-controlled oscillator is connected with the input of Pwm controller two, the power supply VCC input of one end of described sample-offset voltage cell and drive IC, its other end is connected with the input one of current comparator, the peak current sampling end that passes through drive IC of described sampling resistor is connected with the input two of current comparator, the output of described current comparator is connected with the input of Pwm controller three, the output of described Pwm controller is connected with driver element, this driver element is connected with the input of high power transistor switch, the drive signal output of its output by drive IC respectively with fast recovery diode, energy storage inductor connects.
5. according to claim 3 or 4 described a kind of high-power LED driving circuits, it is characterized in that described high power transistor switch adopts Darlington transistor switch or MOS type switch with field-effect transistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100418173A CN101080126A (en) | 2007-06-08 | 2007-06-08 | High-power LED driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100418173A CN101080126A (en) | 2007-06-08 | 2007-06-08 | High-power LED driving circuit |
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| CN101080126A true CN101080126A (en) | 2007-11-28 |
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| CNA2007100418173A Pending CN101080126A (en) | 2007-06-08 | 2007-06-08 | High-power LED driving circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143624A (en) * | 2010-01-28 | 2011-08-03 | 宋忠慎 | Efficient energy saving method for driving LED (light-emitting diode) by high frequency and narrow pulse |
| CN103687201A (en) * | 2013-11-21 | 2014-03-26 | 浙江大学 | Constant-current drive system of LED string lights |
| CN104619085A (en) * | 2015-01-31 | 2015-05-13 | 深圳市美吉星集成科技有限公司 | Ultralow ripple LED eye-protecting lamp |
| CN106208828A (en) * | 2015-05-27 | 2016-12-07 | 罗姆股份有限公司 | Motor drive, motor drive circuit, motor-driven IC and use its chiller, electronic equipment |
| CN107453881A (en) * | 2017-08-08 | 2017-12-08 | 博为科技有限公司 | A kind of bypass circuit and PSE device |
-
2007
- 2007-06-08 CN CNA2007100418173A patent/CN101080126A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102143624A (en) * | 2010-01-28 | 2011-08-03 | 宋忠慎 | Efficient energy saving method for driving LED (light-emitting diode) by high frequency and narrow pulse |
| CN103687201A (en) * | 2013-11-21 | 2014-03-26 | 浙江大学 | Constant-current drive system of LED string lights |
| CN104619085A (en) * | 2015-01-31 | 2015-05-13 | 深圳市美吉星集成科技有限公司 | Ultralow ripple LED eye-protecting lamp |
| CN104619085B (en) * | 2015-01-31 | 2017-07-04 | 深圳市美吉星集成科技有限公司 | Ultralow ripple LED eye-protective lamps |
| CN106208828A (en) * | 2015-05-27 | 2016-12-07 | 罗姆股份有限公司 | Motor drive, motor drive circuit, motor-driven IC and use its chiller, electronic equipment |
| CN106208828B (en) * | 2015-05-27 | 2020-09-29 | 罗姆股份有限公司 | Motor drive device, motor drive IC, and cooling device and electronic apparatus using the same |
| CN107453881A (en) * | 2017-08-08 | 2017-12-08 | 博为科技有限公司 | A kind of bypass circuit and PSE device |
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Open date: 20071128 |