CN106535399B - A kind of new LED driver using single switch structure - Google Patents
A kind of new LED driver using single switch structure Download PDFInfo
- Publication number
- CN106535399B CN106535399B CN201611000409.9A CN201611000409A CN106535399B CN 106535399 B CN106535399 B CN 106535399B CN 201611000409 A CN201611000409 A CN 201611000409A CN 106535399 B CN106535399 B CN 106535399B
- Authority
- CN
- China
- Prior art keywords
- mrow
- msub
- circuit
- resistor
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
A kind of driver for LED, it includes drive circuit and control circuit.Drive circuit can include being used for LC filters, diode rectification bridge circuit and the converter circuit being connected with AC network.Converter circuit can include being operated under interrupted ciruit pattern and sharing a switch mosfetS 1The first converter circuit, the second converter circuit and the 3rd converter circuit.
Description
Technical field
This application involves LED driver, relate more specifically to the circuit knot of the LED driver using single power switch
Structure.
Background technology
Light emitting diode is a kind of diode of specific type, it is a kind of light source with the output of narrow spectrum.The light of LED
Output depends on flowing through the size of its electric current, and to drive its need of work direct current（DC）Power, therefore, in the various of LED
In application scenario, how to realize DC current constant controls is a very important problem in LED driving designs.Common LED drives
Dynamic device is usually by current constant control DC-to-dc converter and PFC portion（PFC）Form.In such configuration, in order to
Convenient design, is often controlled each built-up circuit using multiple independent control circuits and power switch, such as distinguish
For the control of DC-to-dc converter and PFC, this control mode due to introduce more component and can cause higher into
This and lower efficiency, therefore, propose and a kind of share active power by PFC and DC-to-dc converter and open in the art
Close and the LED driver of control circuit construct to overcome drawbacks described above.However, the LED driver of current single switch is in power
Efficiency, switch response and scope of application etc. still suffer from some rooms for improvement.
The content of the invention
For the demand, the present invention proposes a kind of new LED driver using single switch structure, wherein to driving
Design is optimized in terms of dynamic circuit and control circuit, to improve existing for the single switch LED driver of the prior art not
Foot.
By LED driver disclosed in this invention, the power efficiency of drive circuit can not only be improved, and can be
Consistent power factor and low harmonic distortion are obtained on wider loading range, so that with good dynamic response and output
Regulatory function；At the same time, additionally it is possible to improve switch response speed, the dead time of adjusting switch drive signal so that the LED driver
It can be highly suitable for various application scenarios.In addition, in order to meet that the driver of the present invention in the application of various occasions, is also set
A kind of shell mechanism for the driver for being capable of providing cushioning effect is counted.
The driver for LED can include drive circuit and control circuit according to the present invention.Drive circuit can wrap
Include the LC filters, diode rectification bridge circuit and converter circuit for being connected with AC network.Converter circuit can be with
Including being operated under interrupted ciruit pattern and sharing a switch mosfetS 1The first converter circuit, the second converter circuit
With the 3rd converter circuit.
Wherein, the first converter circuit can be the step-down/up type for correcting power factors and adjusting Sinusoidal Input Currents
Converter, it can include the inductor as energy-storage travelling wave tubeL 1 And capacitorC 1 .Second converter can be used to control make base
This constant flyback converter of the DC current through overload, it can include kickback transformerT 1 And capacitorC 0 .CapacitorC 0
Transformer can be connected onT 1 Secondary windings on to be filtered to the output for being supplied to load.3rd converter can be used
In storing and recycle kickback transformerT 1 Release model step-down/up type converter, its can include serve as passive device
InductorL 2 And capacitorC 2 .The converter circuit can be configured to, whenMOSFETSwitchS 1 During conducting, inductorL 1 Quilt
Charging, capacitorC 1 To kickback transformerT 1 Charging, capacitorC 2 To inductorL 2 Charge；And work asMOSFETSwitchS 1 Disconnect
When, kickback transformerT 1 Primary coil and capacitorC 2 Thus connection, the release model of kickback transformer enter capacitorC 2 ,
InductorL 2 The energy of storage is released into capacitorC 1 , inductorL 1 To capacitorC 1 Charge to inductorL 1 In electric current be
Zero, kickback transformerT 1 Magnetizing inductanceL M The energy of middle storage is exported to load via secondary coil.
According to the present invention, the inductor in the first converterL 1 And capacitorC 1 Value can determine according to the following formula：,, wherein,P load For bearing power,V AC For the voltage of input AC electricity,d 1 For
Act on switchS 1 On control signal duty cycle,f s For switching frequency,ωFor pulsation,For capacitorC 1 On voltage ripple percentage,V c1 For capacitorC 1 On average voltage.
According to the present invention, the transformer in the second converterT 1 The number of turnnAnd its magnetizing inductanceL M Value can be under
Row formula determines：,, wherein,For on load output current,
For the peak value of the magnetizing current in magnetizing inductance,V load For load output voltage；L M For transformerT 1 Magnetizing inductance.
According to the present invention, the inductor in the 3rd converterL 2 It can determine according to the following formula：,
Wherein,P lk For average leaked power,V c2 For capacitanceC 2 On average voltage.
According to the present invention, the control circuit can include sample circuit, voltage control oscillating circuit, overvoltage crowbar
And circuit occurs for control signal.Wherein, in sample circuit, the in-phase input end of operational amplifier U_s1 is to flowing through the straight of load
Current sample is flowed, inverting input is connected through resistor R_s3 with output terminal；The inverting input of operational amplifier U_s2 is through electricity
Hinder the output terminal of device R_s5 concatenation operation amplifiers U_s1, and the capacitor C_s2, the resistor R_s6 that are concatenated and the electricity connected
Container C_s3, the parallel circuit of resistor R_s7 connect the output terminal of its own；The in-phase input end of operational amplifier U_s2 connects
It is connected on the movable connection of variable resistance R_s4, two anchor tips of variable resistance R_s4 connect+5V and ground connection respectively.
According to the present invention, voltage control oscillating circuit can include the CMOS phase-locked loop intergrated circuits as square-wave oscillator
CD4046.In phase-locked loop intergrated circuit CD4046, output terminal of the pin 9 through resistor R_r1 concatenation operation amplifiers U_s2,
Pin 6 is grounded through oscillating capacitor C_r3 connections pin 7, pin 11 through osc resistor R_r2.
According to the present invention, in overvoltage crowbar, the in-phase input end collection load output electricity of operational amplifier U_p1
PressureV load , in-phase input end of its output terminal through resistor R_p5 concatenation operation amplifiers U_p2；Operational amplifier U_p2's is anti-
Phase input terminal is through resistor R_p4 connection reference voltagesV refp , its output terminal is through resistor R_p6 connection transistors Q_p1's
Base stage；The emitter ground connection of transistor Q_p1, its collector is through resistor R_p7 connections+15V；Transistor Q_p2's
Resistor R_p9, R_p7 connection+15V that base stage is concatenated, its collector connection+15V, its emitter connection phaselocked loop integrate electricity
The pin 5 of road CD4046.The overvoltage crowbar can be configured to work as load output voltageV load During higher than preset value so that
The voltage of the pin 5 of phase-locked loop intergrated circuit CD4046 is in high level, hence into overvoltage protection state.
According to the present invention, circuit, which occurs, for control signal can include transformer T_c, wherein：In the primary line of transformer T_c
Enclose side, pin 4 of the base stage of transistor Q_c1 through RC parallel circuits connection phase-locked loop intergrated circuit CD4046, its emitter
Ground connection, its collector is through resistor R_c3 connection+15V, and through the base of resistor R_c4 connection transistors Q_c2, Q_c3
Pole；Collector connection+the 15V of transistor Q_c2, the collector of its emitter connection transistor Q_c3；Three pole of crystal
The emitter ground connection of pipe Q_c3；Also, primary of the emitter of transistor Q_c2 also through capacitor C_c2 Yu transformer T_c
One of two incoming ends of coil connect, and the emitter of transistor Q_c3 connects with two of the primary coil of transformer T_c
Enter another connection in end.In the second coil side of transformer T_c, two incoming ends of secondary coil once resistor R_
C7 connecting valvesS 1 , wherein, resistor R_c7 is used to adjust for the dead time of drive signal；In resistor R_c7 away from secondary
It is parallel between the other end in one end of coil and the two of secondary coil incoming ends for shortening switchS 1 Turn-off time
Circuit, in the circuit, the collector of transistor Q_c4 connection resistor R_c7 simultaneously connects its base stage through diode,
Its emitter connects the other end in two incoming ends of secondary coil through diode and connects its base stage through resistor R_c6, its
Base stage is at the same time also via the other end in two incoming ends of RC parallel circuits connection secondary coil.
Driver according to the present invention can also include being used to accommodate drive circuit and the shell mechanism of control circuit.It is described
Shell mechanism can include being provided with the upper shell of buffer part and be provided with the lower housing shell of elastomeric element, and the buffer part can be with institute
Elastomeric element is stated to abut against to provide cushioning effect.
According to the present invention, the lug 112 that thickness diminishes is equipped with the lower end of the side wall 111 of upper shell, is formed in buffer part
Have with the opening portion 124 of lug 112 shape complementation, along the downward projection of protuberance 126 in opening portion 124 and away from opening portion
124 extensions 125 extended towards shell mechanism outside.Elastomeric element can include having first end relative to each other and second
The planar section 131 at end, upwardly extends to form elastic abutting portion 133, along outside wherein bending from first end along interior direction
Clamping part is extended to form to being bent downward from second end, for elastomeric element to be fixed on lower housing shell.In the assembled condition, bullet
Property abutting portion 133 and the protuberance 126 formed and abut.
Brief description of the drawings
Now, by refer to the attached drawing detailed description of the present invention embodiment in an illustrative manner, wherein：
Fig. 1 shows the schematic circuit of the drive circuit of LED driver according to the present invention；
Fig. 2 shows the schematic circuit of the sample circuit of the control circuit of LED driver according to the present invention；
Fig. 3 shows the schematic electricity of the voltage control oscillating circuit of the control circuit of LED driver according to the present invention
Lu Tu；
Fig. 4 shows the schematic circuit of the overvoltage crowbar of the control circuit of LED driver according to the present invention；
Fig. 5 shows that the schematic electricity of circuit occurs for the control signal of the control circuit of LED driver according to the present invention
Lu Tu；And
Fig. 6 schematically shows the shell mechanism of LED driver according to the present invention.
Embodiment
The LED driver of the present invention includes drive circuit and control circuit, and drive circuit can be used for bearing for LED etc.
Carry and driving is provided, control circuit can be used for such as controlling the conducting of power switch in drive circuit, disconnect, and provide overvoltage
Protection etc..
Fig. 1 shows the drive circuit of LED driver according to the present invention, it includesLCFilter, diode rectifier bridge
The circuit such as circuit and converter circuit.
LCFilter can be by inductorL f And capacitorC f Form, it is used for defeated with such as 220V mains power grid
Outlet connects, to be filtered to alternating current 220V alternating currents.
Diode rectification bridge circuit can be the full-bridge type rectifier bridge that is made of four diodes, its withLCFilter phase
Even, for being direct current by AC rectification.
Converter circuit can by first to the 3rd totally three converters to work independently of one another form, these converter works
Make in discontinuous current mode, and share an active power switch, such asMOSFETSwitchS 1 。
Specifically, the first converter can use the form of step-down/up type converter.In the step-down/up type converter,
Include and serve as the inductor that energy-storage travelling wave tube usesL 1 And capacitorC 1 , for causing the first converter to possess correcting power factors
With the ability for adjusting Sinusoidal Input Currents.
Second converter can use the form of flyback converter, it, which is used for control, passes through substantially invariable DC current
Cross LED load.In the flyback converter, including kickback transformerT 1 And capacitorC 0 , wherein capacitorC 0 It is connected on transformerT 1 Secondary coil on, play the role of output filtering.
3rd converter is provided for storing and recycling kickback transformerT 1 Release model, its can be lifting
The form of pressure type converter.In the 3rd converter, including inductorL 2 And capacitorC 2 , used as passive device.
The course of work of driver drive circuit as shown in Figure 1 is as follows：
Be tod when control circuit sends conductivity control signalMOSFETSwitchS 1 During conducting, the power signal from power grid passes through
To the inductor in the first converter after filter, rectification processingL 1 Charging, inductorL 1 On electric currenti L1 Linear increase, and electric currenti L1
Peak value to act on power switchS 1 On Continuity signal duty cycled 1 Function.Meanwhile capacitorC 1 To kickback transformerT 1 Charging, transformerT 1 Storage carrys out sufficient power from capacitorC 1 Energy；Capacitor in 3rd converterC 2 To inductorL 2 Charge.
Be tod when control circuit sends control signalMOSFETSwitchS 1 During disconnection, diodeD 5 It is switched on.Kickback transformerT 1
Primary coil and capacitorC 2 Connection, the release model of kickback transformer is it is possible thereby into capacitorC 2 .DiodeD 2 Also by
Conducting, inductorL 2 Middle stored energy can be released into capacitorC 1 In.DiodeD 1 It is also at conducting state, inductance
DeviceL 1 To capacitorC 1 Energy is provided, until inductorL 1 In electric current drop to zero.Positioned at kickback transformerT 1 The two of primary side
Pole pipeD 6 It is switched on, kickback transformerT 1 Magnetizing inductanceL M The energy of middle storage is exported to load via secondary coil, such as one
A or multiple LED.
Before next circulation starts, the electric current in all inductors in drive circuit is zero,MOSFETSwitchS 1 And diodeD 1 -D 6 In off-state.
In the drive circuit according to the present invention shown in Fig. 1, capacitorC 1 WithC 2 Capacitance should be selected to enough
Greatly to ensure that it is constant that the voltage at these capacitor both ends is held essentially constant.In drive circuit disclosed in this invention, each group
Setting into element to meet relationship below.
（Formula 1）
（Formula 2）
Wherein：P in For the input power of utility grid,V AC For the input voltage of utility grid,f s For switching frequency,d 1 For
Act on power switchS 1 On control signal duty cycle；P LM To pass through transformerT 1 Magnetizing inductanceL M Power,L M WithL lk
Respectively transformerT 1 Magnetizing inductance and leakage inductance,V c1 For capacitorC 1 On average voltage.Work as switchS 1 And diodeD 1 -D 6
It is ideal element（Idle）When,P LM Should be withP in It is equal.
（Formula 3）
（Formula 4）
Wherein：P lk For average leaked power,V c2 For capacitanceC 2 On average voltage,i LM For kickback transformerT 1 In electric current
Peak value,V load For output loading voltage,nFor transformerT 1 The number of turn；P recycle For average recycling power,L 2 For inductorL 2 's
Inductance value；P recycle It should be greater than or equal toP lk 。
In order to enable drive circuit has desired dynamic response and good output voltage/electric current tune according to the present invention
Section, can on wider loading range steady operation, realize consistent power factor and low harmonic distortion, drive of the invention
The parameter of each element in dynamic circuit can be carried out according to the requirement of such as load power demand etc. with reference to the following formula
Design.
For the inductor in the first step-down/up type converterL 1 And capacitorC 1 ：
(formula 5)
（Formula 6）
Wherein,P load For bearing power,ωFor the angular frequency of the AC power of utility grid,For capacitorC 1 On
The percentage of voltage ripple.
For transformerT 1 Number of turn n and its magnetizing inductanceL M ：
（Formula 7）
（Formula 8）
Wherein,To export the DC current to load；For the peak value of the magnetizing current in magnetizing inductance.
For the inductor in the 3rd converterL 2 ：
(formula 9)
In a preferred embodiment of the invention, duty cycled 1 0.5 can be less than；Can be according to switchS 1 Rated current
Value predefines, and is, for example, 5A；Capacitance voltageV c2 It can be previously determined to be so that release model is minimum, be, for example, 300V；Leakage
Sense can be the 5-10% of magnetizing inductance.
For example, the input voltage in utility grid is 220V, the output DC voltage and electric current of drive circuit are respectively
208V and 0.58A, switching frequency 50Hz, duty cycled 1 It is required that in the case of less than 30%, the member in drive circuit shown in Fig. 1
Part value can be preferably：,,,,,,,。
By the drive circuit of the present invention, the energy of the leakage inductance from kickback transformer and its is heavy can be effectively collected
It is new to utilize, so as to greatly improve the energy efficiency of LED driver；Ensure to obtain constant electricity on wider loading range at the same time
Flow output current, and the harmonic distortion of the preferable power factor of uniformity and reduction.
Fig. 2-5 shows the control circuit of LED driver according to the present invention, it is defeated to the direct current loaded in response to exporting
Go out to switchS 1 Control signal is sent so that switchS 1 It is turned on or off.The control circuit of the present invention can include sample circuit, electricity
Circuit occurs for voltage-controlled oscillating circuit processed, overvoltage crowbar and control signal.
Sample circuit includes two operational amplifiers U_s1 and U_s2, and the in-phase input end of operational amplifier U_s1 is to flowing through
The DC current of LED load is sampled, and the inverting input of operational amplifier U_s1 connects its output terminal through resistor R_s3；
Inverting input of the output terminal of operational amplifier U_s1 through resistor R_s5 concatenation operation amplifiers U_s2, the inverting input
Also via the parallel circuit concatenation operation amplifier of capacitor C_s2 and resistor R_s6 and capacitor C_s3 and resistor R_s7
The output terminal of U_s2, the in-phase input end of operational amplifier U_s2 is connected on the movable connection of variable resistance R_s4, variable
Two anchor tips of resistor R_s4 connect+5V and ground connection respectively.
The output terminal of operational amplifier U_s2 is through the CMOS phaselocked loops in resistor R_r1 connection voltage control oscillating circuits
The pin 9 of integrated circuit CD4046, is connected by oscillating capacitor C_r3 between the pin 6 and 7 of CD4046, and pin 11 is through vibration
Resistor R_r2 is grounded.CD4046 serves as square-wave oscillator herein, it is used to voltage signal being converted to frequency signal, by
Working frequency changes to adjust the output current of drive circuit.In the present invention, the input of the control terminal of CD4046 can lead to
Cross the resistance value of adjustment variable resistance R_s4 and then change the reference voltage on U_s2 in-phase input endsV ref To control.In other words,
In the present invention, the control of drive circuit output current can be realized simply by adjusting the resistance value of variable resistance R_s4
System, so as to realize greater flexibility in the application.
When the load in drive circuit is in open-circuit condition, output voltage will be raised quickly.Therefore, in the present invention
Control circuit in be provided with overvoltage crowbar to sense the output voltage Vload of LED load.Overvoltage protection voltage includes two
The in-phase input end collection load output voltage Vload of a operational amplifier U_p1 and U_p2, operational amplifier U_p1, output terminal
In-phase input end through resistor R_p5 concatenation operation amplifiers U_p2, the inverting input connection reference of operational amplifier U_p2
VoltageV refp , the base stage of the output terminal connection transistor Q_p1 of U_p2, the emitter ground connection of Q_p1, the collector of Q_p1
Through resistor R_p7 connections+15V；The base stage of transistor Q_p2 connects+15V through resistor R_p9 with resistor R_p7, receives
Collector connection+15V, emitter export pin 5 of the signal output to CD4046 by overvoltage crowbar.As the LED sensed
When output voltage Vload is higher than some setting value, the voltage of the pin 5 of CD4046 is in high level, then whole circuit entered
Press guard mode.
Circuit, which occurs, for control signal can include four transistors Q_c1, Q_c2, Q_c3, Q_c4 and a transformer
The output pin 4 of T_c, CD4046 are connected to the base stage of transistor Q_c1, transistor Q_ through a RC parallel circuit
The emitter ground connection of c1, collector is through resistor R_c3 connection+15V and through resistor R_c4 connection transistors Q_c2 and Q_
The base stage of c3, the collector connection+15V of transistor Q_c2, the collector of emitter connection transistor Q_c3, crystal
The emitter ground connection of triode Q_c3, in addition, the emitter of transistor Q_c2 is through capacitor C_c2, transistor Q_c3
Emitter be respectively connected to transformer T_c primary coil two incoming ends.
In the second coil side of transformer T_c, the signal from secondary coil is sent to switch through resistor R_c7S 1 , electricity
Resistance device R_c7 is arranged for adjusting the dead time of drive signal.In addition, the remote secondary coil one in resistor R_c7 accesses
It is parallel between that end at end and another incoming end of secondary coil by transistor Q_c4, resistor R_c5 and R_c6, electricity
The circuit that container C_c3 and two diodes being connected respectively with the collector and emitter of transistor Q_c4 are formed, its quilt
Switched for shorteningS 1 Turn-off time.
In circuit occurs for the control signal of the present invention, when the pin 4 of CD4046 exports low level, transistor Q_
C1 is disconnected, transistor Q_c2 conductings, thus capacitor C_c2 is electrically charged, switch S1 conductings.
Fig. 6 is shown is used for the shell mechanism for accommodating LED driver circuit according to the present invention, it can be to be contained in it
Interior circuit provides buffer protection.
The shell mechanism includes upper shell and lower housing shell, buffer part is wherein provided with upper shell, so as to being arranged at down
Elastomeric element on housing is mutually abutted so as to provide cushioning effect.
As shown in the figure, the lower end of the side wall 111 of upper shell is equipped with the lug 112 that thickness diminishes.In buffer part formed with
The opening portion 124 of lug 112 shape complementation, along the downward projection of protuberance 126 in opening portion 124, and away from 124 court of opening portion
The extension 125 of extension on the outside of to shell mechanism.Wherein, opening portion 124 be used for lug 112 formed interference fit connection with
Just buffer part is fixedly connected on upper shell, protuberance 126 is used to abut with elastomeric element, and extension 125 is used for and lower casing
The side wall of body forms contact.
Formed with the groove type engaging portion for accommodating elastomeric element on the side wall of lower housing shell, to the mode being such as buckled
Elastomeric element is fixed and is accommodated therein.Elastomeric element includes the planar section 131 with first end and second end relative to each other.
Along interior direction, bent from the first end of planar section 131 and upwardly extend to form elastic abutting portion 133.In outer side direction, from
Two ends, which are bent downward, extends to form clamping part, for be inserted into the corresponding jack that is buckled in the groove type engaging portion of lower housing shell with
Elastomeric element is fixed on lower housing shell.
Elastomeric element and buffer part can be made of identical or different elastic material, it is preferable that the elasticity of elastomeric element
It is greater than the elasticity of buffer part.In the assembled condition, the abutting portion 133 of elastomeric element and the protuberance of the buffer part of upper shell
126 contradict, so as to form tight seal, while can provide preferable cushioning effect in the horizontal and vertical directions.
In the foregoing description, the principle of the present invention is retouched with reference to the specific illustrative embodiment of the present invention
State.It will be obvious, however, to one skilled in the art, that without departing substantially from spirit of the invention defined in the appended claims
And in the case of scope, various modifications or change can be carried out to the present invention.Therefore, specification and its attached drawing should be considered as and shown
Example property and it is nonrestrictive.
Claims (9)
1. a kind of driver for LED, it includes being used for the drive circuit and control circuit for driving LED, the drive circuit
Including the LC filters, diode rectification bridge circuit and converter circuit for being connected with AC network, it is characterised in that institute
Stating converter circuit includes the first converter circuit, the second converter circuit and the 3rd converter circuit, first, second He
3rd converter circuit is operated under interrupted ciruit pattern, and shares a switch mosfet S1；
First converter circuit is the step-down/up type converter for correcting power factors and adjusting Sinusoidal Input Currents, its
Including the inductor L as energy-storage travelling wave tube1With capacitor C1；
Second converter is to make flyback converter of the substantially invariable DC current through overload for controlling, it includes back
Sweep transformer T1With capacitor C0, the capacitor C0It is connected on the transformer T1Secondary windings on, for negative to being supplied to
The output of load is filtered；
3rd converter is for storing and recycling the kickback transformer T1Release model step-down/up type conversion
Device, it includes the inductor L for serving as passive device2With capacitor C2；
The converter circuit is configured to, as the switch mosfet S1During conducting, the inductor L1It is electrically charged, the electricity
Container C1To the kickback transformer T1Charging, the capacitor C2To the inductor L2Charge；When the MOSFET is opened
Close S1During disconnection, the kickback transformer T1Primary coil and the capacitor C2Connection, the leakage energy of the kickback transformer
Thus amount enters the capacitor C2, the inductor L2The energy of storage is released into the capacitor C1, the inductor L1
To the capacitor C1Charge to the inductor L1In electric current be zero；The kickback transformer T1Magnetizing inductance LMIn deposit
The energy of storage is exported to load via secondary coil.
2. driver as claimed in claim 1, wherein, the inductor L in first converter1With capacitor C1Value
Determine according to the following formula：
<mrow>
<msub>
<mi>L</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>V</mi>
<mrow>
<mi>A</mi>
<mi>C</mi>
</mrow>
</msub>
<mo>*</mo>
<msub>
<mi>d</mi>
<mn>1</mn>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mrow>
<mn>4</mn>
<msub>
<mi>P</mi>
<mrow>
<mi>l</mi>
<mi>o</mi>
<mi>a</mi>
<mi>d</mi>
</mrow>
</msub>
<mo>*</mo>
<msub>
<mi>f</mi>
<mi>s</mi>
</msub>
</mrow>
</mfrac>
</mrow>
<mrow>
<msub>
<mi>C</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<msub>
<mi>P</mi>
<mrow>
<mi>l</mi>
<mi>o</mi>
<mi>a</mi>
<mi>d</mi>
</mrow>
</msub>
<mrow>
<mn>2</mn>
<mi>&omega;</mi>
<mo>*</mo>
<msub>
<mi>&Delta;v</mi>
<mrow>
<mi>c</mi>
<mn>1</mn>
</mrow>
</msub>
<mo>*</mo>
<msup>
<msub>
<mi>V</mi>
<mrow>
<mi>c</mi>
<mn>1</mn>
</mrow>
</msub>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
</mrow>
Wherein, PloadFor bearing power, VACFor the voltage of input AC electricity, d1To act on switch S1On control signal account for
Empty ratio, fsFor switching frequency, ω is pulsation, Δ vc1For capacitor C1On voltage ripple percentage, Vc1For
Capacitor C1On average voltage.
3. driver as claimed in claim 2, wherein, the transformer T in second converter1Number of turn n and its magnetization electricity
Feel LMValue determine according to the following formula：
<mrow>
<msub>
<mi>L</mi>
<mi>M</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mn>2</mn>
<msub>
<mi>P</mi>
<mrow>
<mi>l</mi>
<mi>o</mi>
<mi>a</mi>
<mi>d</mi>
</mrow>
</msub>
</mrow>
<mrow>
<msup>
<msub>
<mi>i</mi>
<mrow>
<mi>I</mi>
<mi>M</mi>
</mrow>
</msub>
<mn>2</mn>
</msup>
<mo>*</mo>
<msub>
<mi>f</mi>
<mi>s</mi>
</msub>
</mrow>
</mfrac>
</mrow>
<mrow>
<mi>n</mi>
<mo>=</mo>
<msqrt>
<mfrac>
<msub>
<mi>V</mi>
<mrow>
<mi>l</mi>
<mi>o</mi>
<mi>a</mi>
<mi>d</mi>
</mrow>
</msub>
<mrow>
<mn>2</mn>
<mo>*</mo>
<msub>
<mi>i</mi>
<mi>o</mi>
</msub>
<mo>*</mo>
<msub>
<mi>L</mi>
<mi>M</mi>
</msub>
<mo>*</mo>
<msub>
<mi>f</mi>
<mi>s</mi>
</msub>
</mrow>
</mfrac>
</msqrt>
<mo>*</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>-</mo>
<msub>
<mi>d</mi>
<mn>1</mn>
</msub>
<mo>)</mo>
</mrow>
</mrow>
Wherein, ioFor on loading output current, iLMFor the peak value of the magnetizing current in magnetizing inductance, VloadFor load output electricity
Pressure；LMFor transformer T1Magnetizing inductance.
4. driver as claimed in claim 3, wherein, the inductor L in the 3rd converter2Determine according to the following formula：
<mrow>
<msub>
<mi>L</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mfrac>
<msup>
<mrow>
<mo>(</mo>
<msub>
<mi>V</mi>
<mrow>
<mi>C</mi>
<mn>2</mn>
</mrow>
</msub>
<mo>*</mo>
<msub>
<mi>d</mi>
<mn>1</mn>
</msub>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mrow>
<mn>2</mn>
<msub>
<mi>P</mi>
<mrow>
<mi>l</mi>
<mi>k</mi>
</mrow>
</msub>
<mo>*</mo>
<msub>
<mi>f</mi>
<mi>s</mi>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein, PlkFor average leaked power, Vc2For capacitance C2On average voltage.
5. driver as claimed in claim 4, the control circuit includes sample circuit, voltage control oscillating circuit, overvoltage
Protect circuit and control signal that circuit occurs, it is characterised in that：
In the sample circuit, the in-phase input end of operational amplifier U_s1 samples the DC current for flowing through load, described
The inverting input of operational amplifier U_s1 is connected through resistor R_s3 with the output terminal of its own；Operational amplifier U_s2's is anti-
Output terminal of the phase input terminal through the resistor R_s5 connections operational amplifier U_s1, and capacitor C_s2, the resistance being concatenated
Device R_s6 is connected the output terminal of its own with capacitor C_s3, the parallel circuit of resistor R_s7 connected；The operation amplifier
The in-phase input end of device U_s2 is connected on the movable connection of variable resistance R_s4, and two of the variable resistance R_s4 are solid
Determine connector and connect+5V and ground connection respectively.
6. driver as claimed in claim 5, wherein the voltage control oscillating circuit is included as square-wave oscillator
CMOS phase-locked loop intergrated circuits CD4046；In the phase-locked loop intergrated circuit CD4046, pin 9 is through resistor R_r1 connections institute
The output terminal of operational amplifier U_s2 is stated, pin 6 is through oscillating capacitor C_r3 connections pin 7, and pin 11 is through osc resistor R_
R2 is grounded；
In the overvoltage crowbar, the in-phase input end collection load output voltage V of operational amplifier U_p1load, it is exported
Hold the in-phase input end through resistor R_p5 concatenation operation amplifiers U_p2；The inverting input warp of the operational amplifier U_p2
Resistor R_p4 connection reference voltages Vrefp, base stage of its output terminal through resistor R_p6 connection transistors Q_p1；Crystal
The emitter ground connection of triode Q_p1, its collector is through resistor R_p7 connections+15V；The base stage of transistor Q_p2 is through string
Resistor R_p9, R_p7 connection+15V of connection, its collector connection+15V, its emitter connect the phase-locked loop intergrated circuit
The pin 5 of CD4046；
The overvoltage crowbar is configured to work as the load output voltage VloadDuring higher than preset value so that the phaselocked loop
The voltage of the pin 5 of integrated circuit CD4046 is in high level, hence into overvoltage protection state.
7. driver as claimed in claim 6, circuit, which occurs, for the control signal includes transformer T_c, wherein：
In the primary side of the transformer T_c, the base stage of transistor Q_c1 connects the lock phase through RC parallel circuits
The pin 4 of ring integrated circuit CD4046, its emitter ground connection, its collector is through resistor R_c3 connection+15V, and through resistor
The base stage of R_c4 connection transistors Q_c2, Q_c3；Collector connection+the 15V of the transistor Q_c2, its emitter
Connect the collector of the transistor Q_c3；The emitter ground connection of the transistor Q_c3；Also, the crystal three
The emitter of pole pipe Q_c2 is also connected through one of capacitor C_c2 and two incoming ends of the primary coil of the transformer T_c,
The emitter of the transistor Q_c3 and another company in two incoming ends of the primary coil of the transformer T_c
Connect；
In the second coil side of the transformer T_c, two incoming ends of the secondary coil once resistor R_c7 connections
The switch S1, wherein, the resistor R_c7 is used to adjust for the dead time of drive signal；In the remote of the resistor R_c7
Opened from being parallel between the other end in one end of the secondary coil and two incoming ends of the secondary coil for shortening
Close S1Turn-off time circuit, in the circuit, the collector of transistor Q_c4 connects the resistor R_c7 simultaneously
Its base stage is connected through diode, its emitter connects the other end and warp in two incoming ends of the secondary coil through diode
Resistor R_c6 connects its base stage, its base stage is also connected via RC parallel circuits in two incoming ends of the secondary coil at the same time
The other end.
8. driver as claimed in claim 7, it is further included for accommodating the outer of the drive circuit and the control circuit
Shell structure, the shell mechanism include being provided with the upper shell of buffer part and are provided with the lower housing shell of elastomeric element, the buffering
Portion can be abutted against with the elastomeric element to provide cushioning effect.
9. driver as claimed in claim 8, wherein, diminish in the lower end of the side wall (111) of the upper shell equipped with thickness
Lug (112), formed with the opening portion (124) with the lug (112) shape complementation, along the opening in the buffer part
Portion (124) downward projection of protuberance (126) and the remote opening portion (124) extend towards shell mechanism outside
Extension (125)；
The elastomeric element includes the planar section (131) with first end and second end relative to each other, wherein along interior direction
Bending upwardly extends to form elastic abutting portion (133) from the first end, and is turned under along lateral direction from the second end
Folding extends to form clamping part, and the clamping part is used to the elastomeric element being fixed on the lower housing shell；
In the assembled condition, the elastic abutting portion (133) abuts with the protuberance (126).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611000409.9A CN106535399B (en) | 2016-11-14 | 2016-11-14 | A kind of new LED driver using single switch structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611000409.9A CN106535399B (en) | 2016-11-14 | 2016-11-14 | A kind of new LED driver using single switch structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106535399A CN106535399A (en) | 2017-03-22 |
| CN106535399B true CN106535399B (en) | 2018-04-17 |
Family
ID=58351704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611000409.9A Active CN106535399B (en) | 2016-11-14 | 2016-11-14 | A kind of new LED driver using single switch structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106535399B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683919A (en) * | 2013-12-09 | 2014-03-26 | 杭州士兰微电子股份有限公司 | High-power-factor low-harmonic-distortion constant current circuit and device |
| CN103874295A (en) * | 2014-03-17 | 2014-06-18 | 杨岳毅 | Single-level LED driving power supply |
| CN104365183A (en) * | 2012-05-31 | 2015-02-18 | 硅工厂股份有限公司 | Power supply circuit for driving led lamp and power supply method, and primary-side control circuit of flyback transformer |
| WO2016005448A1 (en) * | 2014-07-11 | 2016-01-14 | Aledia | Optoelectronic circuit with low-flicker light-emitting diodes |
| US9265114B2 (en) * | 2012-05-15 | 2016-02-16 | Osram Sylvania Inc. | Driver circuit for solid state light sources |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI445444B (en) * | 2011-09-27 | 2014-07-11 | Hannstar Display Corp | Led driving circuit |
| CN103298223A (en) * | 2013-07-09 | 2013-09-11 | 刘方旭 | Step-down piezoelectric transformer driving light-emitting technology method of LED (Light Emitting Diode) and OLED (Organic Light Emitting Diode) |
-
2016
- 2016-11-14 CN CN201611000409.9A patent/CN106535399B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9265114B2 (en) * | 2012-05-15 | 2016-02-16 | Osram Sylvania Inc. | Driver circuit for solid state light sources |
| CN104365183A (en) * | 2012-05-31 | 2015-02-18 | 硅工厂股份有限公司 | Power supply circuit for driving led lamp and power supply method, and primary-side control circuit of flyback transformer |
| CN103683919A (en) * | 2013-12-09 | 2014-03-26 | 杭州士兰微电子股份有限公司 | High-power-factor low-harmonic-distortion constant current circuit and device |
| CN103874295A (en) * | 2014-03-17 | 2014-06-18 | 杨岳毅 | Single-level LED driving power supply |
| WO2016005448A1 (en) * | 2014-07-11 | 2016-01-14 | Aledia | Optoelectronic circuit with low-flicker light-emitting diodes |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106535399A (en) | 2017-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10581334B2 (en) | DC-DC converter and control method | |
| US11011936B2 (en) | Single-stage transmitter for wireless power transfer | |
| US9847710B2 (en) | Universal system structure for low power adapters | |
| US10833594B2 (en) | System and method of controlling a power converter having an LC tank coupled between a switching network and a transformer winding | |
| US8705252B2 (en) | Off line resonant converter with merged line rectification and power factor correction | |
| US20120051097A1 (en) | Power converter with boost-buck-buck configuration | |
| CN102263515B (en) | AC-DC (alternating current-direct current) power conversion chip and power conversion circuit | |
| JP2003520407A (en) | Power feedback power factor correction scheme for multiple lamp operation. | |
| US9531281B2 (en) | AC-DC power converter | |
| CN104158400A (en) | Modularized high-pressure power supply circuit | |
| JPH0213262A (en) | Dc/dc converter | |
| TWI542127B (en) | Active buck power factor correction device | |
| KR100681689B1 (en) | Switching power supply device | |
| US20060187693A1 (en) | Power factor correction apparatus | |
| KR102009351B1 (en) | High Efficiency LLC Resonant Converter with Balanced Secondary Currents using the Two Transformer Structure | |
| KR102545894B1 (en) | Electric vehicle charging system applied dual dc-dc converter | |
| KR102488223B1 (en) | Charging system for electric vehicle with resonant dc-dc converter | |
| CN102611294A (en) | Single-stage PFC (Power Factor Correction) circuit with integrated Cuk circuit and Flyback circuit | |
| CN102630368B (en) | There is the flux converter of power factor correction | |
| CN107834832A (en) | A kind of voltage peak absorbing circuit | |
| CN109639151A (en) | Constant-current control circuit and constant current control method for LLC resonant converter | |
| CN102668352B (en) | With the transducer of power factor correction | |
| JP2009017714A (en) | Switching power circuit | |
| CN106535399B (en) | A kind of new LED driver using single switch structure | |
| CN106452049A (en) | Combined circuit and power supply circuit used for combined circuit as well as display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200407 Address after: 518103 floor 1-3, building a, Venture Park, Fenghuang third industrial zone, Fuyong street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN AIKESIDA TECHNOLOGY Co.,Ltd. Address before: Eagle Star Industrial Park 518103 Guangdong city of Shenzhen province Baoan District Fuyong Third Industrial Zone Phoenix Patentee before: AQUIL STAR PRECISION INDUSTRY (SHENZHEN) Co.,Ltd. |
|
| TR01 | Transfer of patent right |