CN102170732B - Drive circuit topological device for MR16 (Multifaceted Reflector) light-emitting diode - Google Patents
Drive circuit topological device for MR16 (Multifaceted Reflector) light-emitting diode Download PDFInfo
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- CN102170732B CN102170732B CN201110109629.6A CN201110109629A CN102170732B CN 102170732 B CN102170732 B CN 102170732B CN 201110109629 A CN201110109629 A CN 201110109629A CN 102170732 B CN102170732 B CN 102170732B
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- autotransformer
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Abstract
The invention discloses a drive circuit topological device for an MR16 (Multifaceted Reflector) light-emitting diode, which comprises a switch type voltage reducing current regulator (1), a switch type buck converter (2) with autotransformer resonant resetting and an output light-emitting diode (LED) load (3), wherein the switch type voltage reducing current regulator (1) detects the output inductive current of the switch type buck converter (2) with autotransformer resonant resetting and generates a corresponding PWM (Pulse-Width Modulation) control signal according to a corresponding quasi-average current or average current control law for controlling the power switch of the switch type buck converter (2) with autotransformer resonant resetting so that the output inductive current of the switch type buck converter (2) with autotransformer resonant resetting is constant current; and the output inductive current of the switch type buck converter (2) with autotransformer resonant resetting drives the output LED load (3).
Description
Technical field
The invention belongs to electronic technology field, relate to MR16 LED drive and control.More particularly, the present invention relates to a kind of for MR16 LED drive power topology and control program.
Background technology
In light-emitting diode (LED) application market, MR16 light-emitting diode (LED) lamp is maximum.The halogen MR16 lamp of 50 watts is by the power led replacement of 6W, and it has huge energy-saving benefit.For MR16 light-emitting diode (LED) lamp, due to spatial limitation, it is comprised of LED light source, fin and LED driver, and three parts are packaged together.LED light source is a light source, is also a thermal source.The heat of LED light source is sent to radiator, and radiator is sent to its surrounding space by this heat, and this heat is also roasted LED driver simultaneously.For high reliability, all component of the driver of MR16 light-emitting diode (LED) should at high temperature operate.For high-performance MR16 light-emitting diode (LED) lamp, it should have high power factor and dimming function to there is no the problem of color offset.For fear of the problem of colour cast, PWM light-dimming method is a good selection.
For higher power factor and the requirement of PWM brightness adjustment control, due to good dynamic adjustments performance, buck topology is the MR16 LED drive that a good selection realizes, and it can meet the dynamic adjustments requirement of PWM brightness adjustment control, and it as shown in Figure 1.For MR16 application, its input voltage is that 12V exchanges input, and its alternating voltage is from 0V to 17V through the output voltage of rectifier.In order to obtain higher power factor, conventionally wish that LED driver is worked as when opening and being less than 8V when the output instantaneous voltage of its rectifier is greater than 8V to turn-off.Like this, thus LED driver have about 120 degree the angles of flow can guarantee that its power factor is more than 0.9.In actual applications, if load LED voltage V
lEDlow, for example: V
lEDduring=5V, this is easy to meet this system normal operation requirement, and whole system can go on well.If load LED voltage V
lEDheight, for example
or higher, this means step-down controller, its output voltage may surpass its input voltage, so this step-down controller cisco unity malfunction.
With regard to current technology, the light efficiency of LED is relevant to LED electric current.LED electric current is larger, and its LED light efficiency is lower.In order to obtain the efficiency of higher total system, load LED voltage V
lEDshould be higher, like this for a fixing output LED power, thereby its corresponding LED electric current is high with regard to the low LED light efficiency that makes.For high load LED output voltage V
lEDwith low input situation, this buck topology structure should be modified, and to meet this desired application conditions, and keeps the good dynamic adjustments performance of buck topology structure.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of for MR16 LED driving circuit topology apparatus, and the present invention be take positive activation type switch converters as required driving voltage and the electric current of the basis corresponding light-emitting diodes pipe string of generation.
In order to solve the problems of the technologies described above, the invention provides a kind of for MR16 LED driving circuit topology apparatus, comprise switching mode buck current adjuster, switching mode buck converter and output light emitting diode (LED) load with autotransformer resonant reset, the outputting inductance electric current that switching mode buck current adjuster detects with the switching mode buck converter of autotransformer resonant reset produces according to corresponding accurate average current or Average Current Control rule the power switch that corresponding pwm control signal is controlled the described switching mode buck converter with autotransformer resonant reset, thereby making the outputting inductance electric current with the switching mode buck converter of autotransformer resonant reset is a constant current, outputting inductance current drives output light emitting diode (LED) load with the switching mode buck converter of autotransformer resonant reset.
As the improvement for MR16 LED driving circuit topology apparatus of the present invention: the switching mode buck converter with autotransformer resonant reset is to form loop by the former limit of power switch Q and autotransformer T and the diode rectifier RB of MR16 light-emitting diode (LED) driver;
The limit of paying of autotransformer T is connected with sustained diode 2 with rectifier diode D1 respectively; Outputting inductance L and output light emitting diode (LED) load is in series; Outputting inductance L is in parallel with sustained diode 2 with the series arm of output light emitting diode (LED) load; Rectifier diode D1 capacitor C r in parallel is the resonant reset for this autotransformer.
In the present invention, output light emitting diode (LED) can be in series by one to several high brightness LED (LED).
Use the present invention can make MR16 light-emitting diode (LED) driver design its corresponding driver according to different light-emitting diodes pipe string applied voltages, and make this MR16 light-emitting diode (LED) driver can there is High Power Factor and PWM dimming function.Schematic diagram of the present invention as shown in Figure 2.The present invention proposes a kind of positive activation type switch converters topological structure with autotransformer.For different light-emitting diodes pipe string applied voltages, stepping functions due to autotransformer, this makes corresponding MR16 light-emitting diode (LED) driver become possibility, and makes this MR16 light-emitting diode (LED) driver can have High Power Factor and PWM dimming function.Because autotransformer T has some special features, the efficiency of transmission of autotransformer T is higher than the switch transformer of corresponding forward converter.
MR16 light-emitting diode of the present invention (LED) driver switch converter topology structure and control program, it is by switching mode buck current adjuster, with switching mode buck converter and output light emitting diode (LED) the load composition of autotransformer resonant reset.Switching mode buck current adjuster is according to detected outputting inductance current methods, to carry out accurate average current or average current rule to control and produce the reference level that corresponding pwm control signal comes power ratio control switch Q to make the average current of this outputting inductance L follow this switching mode buck current adjuster and change.The described switching mode buck converter with autotransformer resonant reset is the diode rectifier RB formation loop by the former limit of power switch Q and autotransformer and MR16 light-emitting diode (LED) driver; The limit of paying of autotransformer is connected with sustained diode 2 with rectifier diode D1 respectively; Outputting inductance L and output light emitting diode (LED) load is in series; Outputting inductance L is in parallel with sustained diode 2 with the series arm of output light emitting diode (LED); Rectifier diode D1 capacitor C r in parallel is the resonant reset for this autotransformer; Output light emitting diode (LED) load is to be in series by one to several high brightness LED (LED).
One of advantage of the present invention is can make to require to design MR16 light-emitting diode (LED) driver and have good dynamic adjustments performance for concrete high brightness LED (LED) load applications to become possibility.
Two of advantage of the present invention is to make MR16 light-emitting diode (LED) driver have High Power Factor with suitable LED driving governor combination.
Three of advantage of the present invention is the effects due to good Static adjust performance, can make MR16 light-emitting diode (LED) driver output high-precision current source.
Four of advantage of the present invention is the effects due to good dynamic adjustments performance, can make MR16 light-emitting diode (LED) driver have good dynamic response capability.
Five of advantage of the present invention is to have PWM dimming function because good dynamic response capability can make corresponding MR16 light-emitting diode (LED) driver.
Six of advantage of the present invention is the wide pulse width modulation ranges that can utilize this autotransformer to bring, saves the large storage capacitor Cin in existing MR16 light-emitting diode (LED) driver.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is existing buck MR16 light-emitting diode (LED) driver;
Fig. 2 is schematic diagram of the present invention;
Fig. 3 changes the transition scheme (for existing) of buck converter with a forward converter;
Fig. 4 is the circuit diagram for MR16 LED driving circuit topological structure and control program instantiation 1 of the present invention;
Fig. 5 is the circuit diagram for MR16 LED driving circuit topological structure and concrete the second example of control program of the present invention.
Embodiment
Initial imagination is to change step-down controller with a forward converter, shown in Fig. 3.Forward converter has the good dynamic adjustments performance of step-down controller.In forward converter, there is a switch transformer T.Switch transformer T, can reduce equivalent load LED voltage V just
lED_EQU, LED voltage V
lEDby the turn ratio N of switch transformer T
sPreduce, i.e. V
lED_EQU=V
lED/ N
sP.In this design, switch transformer T is used for transmitting all power outputs.The size of this switch transformer T is according to transmitted power output design.In the driver design of MR16 light-emitting diode (LED), the limited space that it can have.The size of this switch transformer T likely makes the size of the driver of this MR16 light-emitting diode (LED) be greater than the confined space that it can have.
For MR16 application, it is that 12V exchanges input, there is no the requirement of isolation.Switch transformer T can be replaced as shown in Figure 4 by an autotransformer T.MR16 light-emitting diode of the present invention (LED) driver switch converter topology structure and control are by the switching mode buck converter 2 with autotransformer resonant reset, and switching mode buck current adjuster 1 and output light emitting diode (LED) load 3 form.Switching mode buck converter 2 with autotransformer resonant reset is to form loop by the former limit of power switch Q and autotransformer T and the diode rectifier RB of MR16; The limit of paying of autotransformer T is connected with sustained diode 2 with rectifier diode D1 respectively; Outputting inductance L and output light emitting diode (LED) load 3 is in series; Outputting inductance L is in parallel with sustained diode 2 with the series arm of output light emitting diode (LED) load 3; Rectifier diode D1 capacitor C r in parallel be for: when power switch Q turn-offs, the resonant reset of autotransformer T; Switching mode buck current adjuster 1 is according to the detect outputting inductance electric current obtaining, to carry out accurate average current or Average Current Control to produce corresponding pwm control signal to come power ratio control switch Q to make the average current of outputting inductance L be a constant current.Average current driver output light-emitting diode (LED) load 3 of outputting inductance L.
In the present invention, switching mode buck current adjuster 1 for example can be with reference to patent US 7250744B2.
Specifically, as follows:
In Fig. 4, autotransformer T is when power switch Q turn-offs, and the magnetizing inductance Lm of autotransformer T is through the sustained diode 2 capacitor C r resonance in parallel with rectifying tube D1.The exciting curent of autotransformer T is through resonant capacitance Cr resonant reset.The resonance half-wave that certain power switch Q turn-off time must be greater than magnetizing inductance Lm and resonant capacitance Cr resets completely to guarantee the exciting curent of autotransformer T.
Autotransformer T has some special features.The transmission gross power of transferring to pair limit from the former limit of autotransformer T is to transmit respectively by circuit and magnetic circuit.This is with turn ratio N by circuit and the power ratio transmitted by magnetic circuit
sPchange and change.As turn ratio N
sPbe 1 o'clock, from the transmission gross power on the Dao Fu limit, former limit of autotransformer T, only by circuit, and the power transmitting by magnetic circuit is zero.This means in ideal conditions, the size of autotransformer T can be zero.As this turn ratio N
sPbe not equal to 1, for example N
sP=2, in autotransformer T, half passes through circuit by magnetic circuit from former limit, to transfer to the transmission gross power of paying limit and be half.This means N
sPin=2 situations, because half transmission gross power is only to transmit by magnetic circuit, the size of autotransformer T can be half of switch transformer size of the forward converter of respective transmissions gross power.The size of autotransformer T likely makes the size of the driver of this MR16 light-emitting diode (LED) meet the confined space that it can have.Owing to there being half transmission gross power, be directly to transmit by circuit, the efficiency of transmission nature of autotransformer T is higher than the switch transformer of corresponding forward converter.
Switching mode buck current adjuster 1 is to be carried out accurate average current or Average Current Control according to the detect outputting inductance L electric current obtaining.In the driver switch converter topology structure of this MR16 light-emitting diode (LED), outputting inductance L is the limit of paying at autotransformer T.The output current that detects outputting inductance L has two kinds of methods.The first is when power switch Q conducting, and the electric current flowing through in power switch Q is corresponding to the output current of outputting inductance L.Adopting accurate Average Current Control method just can produce corresponding pwm control signal, to come power ratio control switch Q to make the average current of outputting inductance L be a constant current.It two is output currents of direct-detection outputting inductance L.Adopting Average Current Control method just can produce corresponding pwm control signal, to come power ratio control switch Q to make the average current of outputting inductance L be a constant current.
Finally, it is also to be noted that, what more than enumerate is only several specific embodiments of the present invention.Obviously, the invention is not restricted to above embodiment, can also have many distortion.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (1)
1. for MR16 LED driving circuit topology apparatus, it is characterized in that: comprise switching mode buck current adjuster (1), switching mode buck converter (2) and output light emitting diode (LED) load (3) with autotransformer resonant reset, the outputting inductance electric current that described switching mode buck current adjuster (1) detects with the switching mode buck converter (2) of autotransformer resonant reset produces according to corresponding accurate average current or Average Current Control rule the power switch that corresponding pwm control signal is controlled the described switching mode buck converter (2) with autotransformer resonant reset, thereby making the outputting inductance electric current with the switching mode buck converter (2) of autotransformer resonant reset is a constant current, outputting inductance current drives output light emitting diode (LED) load (3) of the described switching mode buck converter (2) with autotransformer resonant reset,
The described switching mode buck converter (2) with autotransformer resonant reset is to form loop by the former limit of power switch Q and autotransformer T and the diode rectifier RB of MR16 light-emitting diode (LED) driver;
The limit of paying of autotransformer T is connected with sustained diode 2 with rectifier diode D1 respectively; Outputting inductance L and output light emitting diode (LED) load (3) is in series; Outputting inductance L is in parallel with sustained diode 2 with the series arm of output light emitting diode (LED) load (3); Rectifier diode D1 capacitor C r in parallel is the resonant reset for this autotransformer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110109629.6A CN102170732B (en) | 2011-04-24 | 2011-04-24 | Drive circuit topological device for MR16 (Multifaceted Reflector) light-emitting diode |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110109629.6A CN102170732B (en) | 2011-04-24 | 2011-04-24 | Drive circuit topological device for MR16 (Multifaceted Reflector) light-emitting diode |
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| CN102170732A CN102170732A (en) | 2011-08-31 |
| CN102170732B true CN102170732B (en) | 2014-02-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT512118B1 (en) * | 2011-10-18 | 2013-09-15 | Felix Dipl Ing Dr Himmelstoss | CONTROLLER WITH RESTRICTED KEY RATIO FOR CONTROLLING LIGHT EMITTING DIODES |
| CN104053270A (en) * | 2013-03-14 | 2014-09-17 | 凹凸电子（武汉）有限公司 | Light source drive circuit, and controller and method for controlling electric energy for light source |
| CN103414344A (en) * | 2013-07-19 | 2013-11-27 | 深圳桑达国际电源科技有限公司 | Wide-range input high-conversion-rate boost-buck conversion circuit and direct current conversion device |
| CN104470031B (en) * | 2013-09-16 | 2017-07-28 | 通嘉科技股份有限公司 | The electronic installation and control method for the DC current for flowing through an element can be adjusted |
| CN104660040A (en) * | 2013-11-26 | 2015-05-27 | 青岛鼎信通讯股份有限公司 | Buck power supply for implementing auxiliary output through self-coupling coil |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076139C (en) * | 1996-07-18 | 2001-12-12 | 国际电力设备公司 | Single ended forward Dc-to-DC converter providing enhanced resetting for synchronous rectification |
| CN101925236A (en) * | 2010-08-20 | 2010-12-22 | 杭州电子科技大学 | Isolated high-power factor flyback type primary-side constant-current control device of LED driver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04175908A (en) * | 1990-11-09 | 1992-06-23 | Mitsubishi Electric Corp | Switching regulator |
| US7250744B2 (en) * | 2004-04-26 | 2007-07-31 | Da Feng Weng | Quasi average current mode control scheme for switching power converter |
| CN2869961Y (en) * | 2006-01-21 | 2007-02-14 | 邓小龙 | Power frequency ac, stabilizer regulated by high-frequency PWM |
-
2011
- 2011-04-24 CN CN201110109629.6A patent/CN102170732B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076139C (en) * | 1996-07-18 | 2001-12-12 | 国际电力设备公司 | Single ended forward Dc-to-DC converter providing enhanced resetting for synchronous rectification |
| CN101925236A (en) * | 2010-08-20 | 2010-12-22 | 杭州电子科技大学 | Isolated high-power factor flyback type primary-side constant-current control device of LED driver |
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