CN108449838A - Great power LED system based on remote control - Google Patents
Great power LED system based on remote control Download PDFInfo
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- CN108449838A CN108449838A CN201810336748.7A CN201810336748A CN108449838A CN 108449838 A CN108449838 A CN 108449838A CN 201810336748 A CN201810336748 A CN 201810336748A CN 108449838 A CN108449838 A CN 108449838A
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- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
- H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses the great power LED systems based on remote control, including EMI rectification filtering modules, active power factor correcting module, LLC resonance modules, buck converter module and feedback control module；EMI rectification filtering modules are electrically connected with feedback control module, EMI rectification filtering modules, LLC resonance modules, feedback control module and active power factor correcting module are electrically connected, and buck converter module, feedback control module and LLC resonance modules are electrically connected；The present invention provides a kind of circuit is simple, modularized design, the lower-cost great power LED system based on remote control.
Description
Technical field
The present invention relates to LED fields, more specifically, it is related to the great power LED system based on remote control.
Background technology
LED as new light source, it every watt luminous flux and the service life all will be high than conventional fluorescent fluorescent tube and incandescent lamp, institute
Traditional light source will be replaced with LED light source.There are one very important other than having LED light source in LED illumination device
Component part --- LED driver, but existing high-power LED driver cost is higher, volume is larger, is not suitable for being integrated in
In one circuit chip, and efficiency is too low, and energy consumption is excessive, in cost and the volume advantage all not any compared with conventional light source.
Invention content
The present invention overcomes the deficiencies in the prior art, it is simple to provide a kind of circuit, modularized design, lower-cost base
In the great power LED system of remote control, technical scheme is as follows：
Great power LED system based on remote control, including EMI rectification filtering modules, active power factor correcting module,
LLC resonance modules, buck converter module and feedback control module；EMI rectification filtering modules electrically connect with feedback control module
It connects, EMI rectification filtering modules, LLC resonance modules, feedback control module and active power factor correcting module are electrically connected, drop
Pressure type conversion module, feedback control module and LLC resonance modules are electrically connected；EMI rectification filtering modules convert voltage waveform
At the voltage oscillogram of similar steamed bun shape, active power factor correcting module receives the voltage wave of EMI rectification filtering modules transmission
Shape figure, and output is converted as fixed value voltage, fixed value voltage is converted to what the operation of buck converter module needed by LLC resonance modules
Constant voltage, voltage oscillogram, fixed value voltage and constant voltage all carry out Real-time Feedback by feedback control module, which is provided with
Active power factor correction module, LLC resonance modules carry out output adjustment.
Further, active power factor correcting module includes inductor L1, diode D2 and control chip U1；Control core
The D pins of piece U1 are connect with the anode of one end of inductance L1, diode D2, and the cathode of diode D2 connects with the cathode of diode D1
It connects, one end connection of the anode of diode D2 and the rectifier circuit of power input, diode D1 is bypass diode, is used for
Charging, serial communication are to prevent the generation of the resonance in rigid booting；It controls chip U1 and control signal, V pins and resistance is provided
One end of R2, one end connection of capacitance C4, resistance R2 is to detect the rectification AC-input voltage of power supply, and capacitance C4 is to eliminate signal
On noise；The cathode of diode D2 is connect with one end of resistance R1, and resistance R1, resistance R3, resistance R7, resistance R9 and resistance
R10 is composed in series dividing network for scaling output voltage and providing feedback to control chip U1；Resistance R3 shunt capacitance C1, and
One end that resistance R3 is connect with resistance R10 is connect with one end of resistance R4, and the other end of resistance R4 connects with the grid of transistor Q1
It connecing, the source electrode of transistor Q1 is connect with one end of the source electrode of transistor Q2, one end of resistance R5, one end of resistance R6, resistance R8,
The other end of resistance R5 is connect with the other end of resistance R10, and resistance R6 connects with capacitance C6, the other end and the control core of resistance R8
One end of one end connection of the FB pins, capacitance C7 of piece U1, resistance R7 and resistance R9 connections is connect with the grid of transistor Q2, electricity
Hinder the other end of R9, the other end of capacitance C6, the other end of capacitance C7, the other end of capacitance C4, one end of capacitance C5, transistor
The drain electrode of Q2 is connect with the G pins of control chip U1, the other end, the transistor Q1 of the VCC pin and capacitance C5 of control chip U1
Drain electrode connection；The other end of resistance R2 is connected with the other end of one end of capacitance C3, inductance L1, the other end of capacitance C3 with
The cathode of wherein one end polar capacitor of rectifier circuit is connected, and the anode of polar capacitor is connect with one end of resistance R1.
Further, resistance R2 selects two concatenated fixed carbon resisters of 2M Ω, the patch of capacitance C4 selection 100nF pressure resistances 50V
Chip capacitor, resistance R1, resistance R10, resistance R7 and resistance R9 are respectively 4M Ω, 2.2K Ω, 2.2K Ω, 57.6K Ω, capacitance C1 choosings
The thin-film capacitor of pressure-resistant 200V capacitances 100nF is selected, resistance R8 and capacitance C7 select 10 Ω resistance and 10nF capacitances, resistance R6 respectively
3K Ω, capacitance C6 is selected to select 4.7uF, transistor Q1 and Q2 that the NPN of the MMBT4401 of 40V is selected to manage with MMBT4403's respectively
PNP pipe.
Further, the VCC pin of control chip U1 is connect with inverse-excitation type auxiliary power circuit, the inverse-excitation type auxiliary electricity
Source circuit includes transformer T1-1, transistor Q1-1 and zener diode VR1-1；The input terminal of transformer T1-1 and control chip
The D pins of U1-2 connect, and one end of the output end of transformer T1-1 is connected with the anode of diode D1-1, diode D1-1's
Cathode is connect with one end of the anode of polar capacitor C2, one end of resistance R1-2, one end of resistance R1-3 and capacitance C1-4, resistance
The other end of R1-2 is connect with the source electrode of transistor Q1-1, the grid of transistor Q1-1 and one end of capacitance C1-3, resistance R1-3
The other end, zener diode VR1-1 cathode connection, the drain electrode of transistor Q1-1 and the other end of capacitance C1-3 control chip
The FB pins of U1-2 connect；The other end of transformer output end and the other end of capacitance C1-2, the sun of zener diode VR1-1
One end connection of pole, the other end of capacitance C1-4, the S pins of control chip U1-2, capacitance C1-1, the other end of capacitance C1-1 with
Control the BP pins connection of chip U1-2.
Further, LLC resonance modules include control chip U2-1, capacitance C2-2, the transformer of built-in two MOSFET
Secondary windings NA, booster diode and transformer secondary switch QA, booster diode includes diode DA1 and diode
DA2；The transformer secondary output winding N of transformer T2-1AIt is all connected with diode, wherein transformer with transformer main winding Ns
Grade winding NATwo ends be separately connected the anode of diode DA1 and diode DA2, the cathode of diode DA1 and diode DA2
It is connect with one end of the switch QA of transformer secondary, the other end and the transformer main winding of the switch QA of transformer secondary
One end connection of the anode, capacitance C2-3 of the diode of Ns connections, the other end of capacitance C2-3 and one end of transformer T2-1,
One end of LLC feedback circuits connects；The one of the other end of LLC feedback circuits and the FB pins of control chip U2-1, capacitance C2-4
The DT/BF pins of end connection, control chip U2-1 are connect with one end of resistance R2-2, the other end and the resistance R2-4 of resistance R2-2
One end, control chip U2-1 the connection of VREF pins, maximum frequency when for dead time is arranged, starts and burst threshold
Frequency；The G pins and one end of the other end of capacitance C2-4, the other end of resistance R2-4, resistance R2-3 for controlling chip U2-1 connect
It connects, the OV/UV pins of control chip U2-1 are connect with one end of the other end of resistance R2-3, resistance R2-1, control chip U2-1
D pins connect with the other end of resistance R2-1, the VCC pin of control chip U2-1 is connect with the anode of diode D2-1, two
The cathode of pole pipe D2-1 connect with one end of the control VCCH pins of chip U2-1, capacitance C2-1, the other end of capacitance C2-1 and
Control one end connection of the HB pins, capacitance C2-2 of chip U2-1, the other end of capacitance C2-2 and wherein the one of transformer T2-1
The wherein other end of end connection, transformer T2-1 is connect with one end of the IS pins of control chip U2-1, resistance R2-5, resistance
The other end of R2-5 is connect with the S1/S2 pins of control chip U2-1.
Further, LLC feedback circuits include photoisolator UB, resistance ROPTO；One end of photoisolator UB and two
One end connection of the anode, resistance RLOAD of pole pipe Dk, the cathode of diode Dk are connect with one end of resistance ROPTO, resistance
The other end of ROPTO is connect with one end of one end of resistance RSTART, capacitance CFB, the other end and the resistance RLOAD of capacitance CFB
Other end connection, the other end of resistance RSTART and resistance RFMINOne end, polarized capacitance CSTARTCathode connection, have pole
Property capacitance CSTARTAnode and resistance RFMINThe other end, photoisolator UB the other end connection.
Further, resistance R2-1 selections 2.9M Ω, resistance R2-3 select 20k Ω, resistance ROPTO1.2k Ω are selected,
Capacitance CFBSelect 4.7nF, resistance RLOAD selection 4.7k Ω.
Further, buck converter module includes control chip U3-1, resistance R3-1, resistance R3-2 and LED light；Control
Chip U3-1 the 4th, resistance R3-1, a termination of the 4th pin and resistance R3-2 of control chip U3-1 are connected between 5 pins
3rd pin on ground, control chip U3-1 is connect with the other end of resistance R3-2, is controlled the 1st of chip U3-1, is connected between 2 pins
Capacitance C3-1 is met, and controls the 2nd pin ground connection of chip U3-1, the 6th pin of control chip U3-1 is connect with pwm driver,
The 7th pin of control chip U3-1 is connect with the anode of one end of inductance L3-1, diode D3-1, and the 8th of control chip U3-1 the
Pin is connect with one end of the cathode of diode D3-1, one end of LED light, capacitance C3-2, the other end ground connection of capacitance C3-2,
The other end of LED light is connect with the other end of inductance L3-1.
Further, resistance R3-1 determines that switching frequency, relation formula are as follows：
Wherein R is that resistance R3-1, f are switching frequency；The value range 250KHz-1MHz of switching frequency, so resistance R3-
1 resistance value is 20k Ω；
Resistance R3-2 determines that the size of current of LED light is flowed through in setting, and relation formula is as follows：
Wherein R3-2 be resistance R3-2 resistance value, ILED be LED light size of current, because electric current size ranging from
350mA<ILED<1A, so resistance R3-2 selection 3.2k Ω.
Advantage is the present invention compared with prior art：
The present invention uses the two-stage topologies of " PFC+HBR ", the present invention to be supplied to afterbody in rear stage voltage
The BUCK circuits of four tunnels parallel connection, the chip of this four roads BUCK circuit are can to adjust the average current of output with light modulation pin
Size.The signal of DIM pins on BUCK chips is provided by microcontroller, and microcontroller can be by wireless receiving mobile terminal
Instruction, export different duty cycle signals and be supplied to BUCK chips, realize that mobile phone controls the intelligent dimming function on four tunnels, so
Rear class and the BUCK circuits for connecting four road adjustable current sizes, the average value of the output current of BUCK circuits is by microcontroller and Wi-
The intelligent object control of Fi modules composition.The pfc circuit of the present invention realizes the response time to improve load transient response, and work
Working frequency is big across range, there is good compatibility.
The present invention proposes a kind of LLC series resonance translation circuits carrying out retention time compensation using auxiliary circuit.It is logical
It crosses using auxiliary retention time compensation circuit, higher gain can be obtained when needing to keep output voltage, and in normal work
Under operation mode, transfer efficiency can be improved.LLC resonant transform circuits are by wide input voltage range, to reduce capacitance prime PFC
Capacitance volume.
The light adjusting circuit of the present invention uses the BUCK circuits of tunable optical, and using the intelligence of Wi-Fi module combination with the MCU
Energy control module.The BUCK circuits of four tunnels parallel connection provide constant electric current to RGBW-LED strings respectively, can per road BUCK circuits
Dimming function is implemented separately.Can light modulation toning can realize RGBW-LED by using mobile terminal of mobile telephone convenient for user
Function.
Description of the drawings
Fig. 1 is that the present invention is based on the great power LED system active power factor correction module schematic diagrams of remote control；
Fig. 2 is that the present invention is based on the great power LED system inverse-excitation type auxiliary power circuit schematic diagrams of remote control；
Fig. 3 is that the present invention is based on the great power LED system LLC resonance modules circuit diagrams of remote control；
Fig. 4 is that the present invention is based on the great power LED system LLC feedback circuit figures of remote control；
Fig. 5 is that the present invention is based on the great power LED system buck converter module circuit diagrams of remote control；
Fig. 6 is LLC typical gains curve (k=5)；
Fig. 7 is the gain under LLC different value of K；
Fig. 8 is the schematic diagram of LCC circuits.
Specific implementation mode
The present invention is further described with reference to the accompanying drawings and detailed description.
As shown in Figures 1 to 7, the great power LED system based on remote control, including EMI rectification filtering modules, active work(
Rate factor correcting module, LLC resonance modules, buck converter module and feedback control module.EMI rectification filtering modules and feedback
Control module is electrically connected, EMI rectification filtering modules, LLC resonance modules, feedback control module and active power factor correction mould
Block is electrically connected, and buck converter module, feedback control module and LLC resonance modules are electrically connected.EMI rectification filtering modules will
Voltage waveform is converted into the voltage oscillogram of similar steamed bun shape, frequency 100Hz, and active power factor correcting module receives EMI
The voltage oscillogram of rectification filtering module transmission, and convert and export as fixed value voltage, fixed value voltage 385V.LLC resonance modules
Fixed value voltage is converted into the constant voltage that the operation of buck converter module needs, the constant voltage is adjustable to be made 48V, voltage wave
Shape figure, fixed value voltage and constant voltage all carry out Real-time Feedback by feedback control module, and the feedback is for active power factor correction
Module, LLC resonance modules carry out output adjustment.In the inventive solutions, LED constant pressures driving can reach following effect
Fruit：Input voltage normal 220V, maximum 265V, minimum 90V；Input voltage frequency normal 50Hz, maximum 53Hz, minimum 47Hz；
Input current range 0-1800mA, 750mA when normally inputting；Power factor (PF) is not less than 0.9 when 20%-80% is loaded, circuit
Efficiency is more than 90% when 80%-100% is loaded；Output voltage 48V, output current maximum 3.5A, normally 0-3.125A it
Between；The output power of full load is higher than 150W.
Preferably, active power factor correcting module includes inductor L1, diode D2 and control chip U1.It is described
The D pins of control chip U1 are connect with the anode of one end of inductance L1, diode D2, and the cathode of diode D2 is with diode D1's
Cathode connects, and one end of the anode of diode D2 and the rectifier circuit of power input connects, and diode D1 is two poles of bypass
Pipe, for charging, serial communication to be to prevent the generation of the resonance in rigid booting.It controls chip U1 and control signal, V pins is provided
It is connect with one end of one end of resistance R2, capacitance C4, resistance R2 is to detect the rectification AC-input voltage of power supply, and capacitance C4 is to disappear
Except the noise on signal.The cathode of diode D2 is connect with one end of resistance R1, and resistance R1, resistance R3, resistance R7, resistance R9
Dividing network is composed in series for scaling output voltage and providing feedback to control chip U1 with resistance R10.Resistance R3 electricity in parallel
Hold C1, and one end that resistance R3 is connect with resistance R10 is connect with one end of resistance R4, the other end of resistance R4 is with transistor Q1's
Grid connects, the source electrode of transistor Q1 and the source electrode of transistor Q2, one end of resistance R5, one end of resistance R6, resistance R8 one
End connection, the other end of resistance R5 are connect with the other end of resistance R10, and resistance R6 connects with capacitance C6, the other end of resistance R8
It is connect with one end of the FB pins of control chip U1, capacitance C7, the grid of one end and transistor Q2 of resistance R7 and resistance R9 connections
Pole connect, the other end of resistance R9, the other end of capacitance C6, the other end of capacitance C7, the other end of capacitance C4, capacitance C5 one
The drain electrode at end, transistor Q2 connect with the G pins of control chip U1, control the VCC pin of chip U1 and the other end of capacitance C5,
The drain electrode of transistor Q1 connects.The other end of resistance R2 is connected with the other end of one end of capacitance C3, inductance L1, capacitance C3's
The other end is connected with the cathode of wherein one end polar capacitor of rectifier circuit, one end of the anode and resistance R1 of polar capacitor
Connection.Resistance R2 is connected with voltage monitoring pin V for the rectification AC-input voltage for detecting power supply, and capacitance C4, which can be eliminated, to be drawn
Any noise on foot.The voltage at the both ends resistance R2 is very high, so two concatenated fixed carbon resisters of 2M Ω are selected, C4 selections
The patch capacitor of 100nF pressure resistances 50V.The electricity of the offer 6V in feedback pin (FB) under the voltage of rated output 385V is provided
Hinder potential-divider network.The dividing network being made of resistance R1, R10, R7 and R9 is used for providing feedback to U1, their value is respectively
4MΩ、2.2KΩ、2.2KΩ、57.6KΩ.Capacitor C1 is a kind of soft start capacitor device, can reduce output voltage on startup
Overshoot, so the thin-film capacitor of selection pressure resistance 200V capacitances 100nF.Resistance R8 and capacitor C7 form a low-pass filter,
To filter out any switching noise being coupled in FB pins, the R8 and C7 of this programme select 10 Ω resistance and 10nF capacitances respectively.
R6 and capacitor C6 is loop compensation networks, and which introduce the low frequency zeros needed for customization loop response, to ensure low intersection frequency
Rate and enough phase margins, the resistance of this programme R6 selection 3K Ω, C6 select the capacitance of 4.7uF.Q1 and Q2 are in linear feedback
In effect be Q1 the and Q2 transient switchings when quickly variation occurs for output voltage, with quick correction feedback pin voltage, to
Help the variation of U1 response output voltages.Due to power supply voltage 12V and electric current it is all smaller, select the MMBT4401 of 40V
NPN pipe and MMBT4403 PNP pipe.Wherein, in output end setting output capacitance COPFC, value can select the electricity of 100uF
Solve capacitance.The size of the voltage ripple exported at this time can be obtained by following formula.
Wherein, Po be PFC output power (by watt as unit of)；The frequency of f is a-c cycle 50Hz, the line of high frequency output
Wave can be ignored compared with a-c cycle；VOUT(MAX)Be output voltages of the PFC under nominally be 385V；The voltage line exported at this time
Wave is the voltage of 12.5V, is met the requirements.Therefore, selecting the Japanese Black King Kong electrolytic capacitor of high frequency low-resistance, its specification is
450V, 100uF, and volume is 18mm × 25mm, with traditional great power LED drive the volume 25mm of PFC output capacitances ×
30mm is compared, its volume is reduced left and right by about one time.
Preferably, the parameter selection of inductance L1, takes into account following two requirements：First, inductance is avoided in maximum current
Magnetic flux is saturated, second is that be happened at input voltage minimum for maximum current, when output power maximum.First, it is exported most
High current Iimax, maximum input current is happened under minimum input voltage 90Vac, and the efficiency of PFC is that 95% occur can by formula
To obtain out maximum current as 1.7A.
Po is the power of PFC outputs；η is the efficiency factor of PFC.
In the case of minimum input voltage, duty ratio at this time is maximum duty ratio Dpmax, wherein UiminIt is to input most
Small voltage, its crest voltage are 126V, UoFor standard output voltage 385V, obtaining out maximum duty cycle by formula is
0.67。
Since the control chip of PFC is using constant weber/ampere-second control, so its output average frequency is variable,
Average frequency in input voltage 90VAC is about 50KHz.Since inductance equation can obtain the equation that obtains of inductance L, one
As in the case of, the ripple in the inductive current of continuous conduction mode is determined that current ripples rate, which is taken as 0.4, is by current ripples rate r
Optimal value, so the ripple current of inductance obtains 0.95A by formula (1.4).The value that inductance is obtained out by formula (1.5) is
1.8mH。
R is current ripples rate；IimaxFor maximum output current；△ I are the ripple current of inductance；UiminFor the minimum electricity of input
Pressure；Ton is turn-on time；DpmaxFor maximum duty ratio；F is a-c cycle；
In order to avoid magnetic flux is saturated, the iron sial toroidal core with high saturated magnetic induction is selected.With band gap
Compared to iron sial toroidal core edge loss will not occur for FERRITE CORE, and temperature change magnetic flux also keeps relatively permanent
It is fixed.Considered by the size of inductance value and input current, using the iron sial ring magnet ring of 27MM, with the enamel-cover of a diameter of 0.64mm
Line closely around 120 circle left and right, can obtain the inductance of satisfactory 1.8mH.
Preferably, the VCC pin of control chip U1 is connect with inverse-excitation type auxiliary power circuit, the inverse-excitation type auxiliary
Power circuit includes transformer T1-1, transistor Q1-1 and zener diode VR1-1.The input terminal of transformer T1-1 and control core
The D pins of piece U1-2 connect, and one end of the output end of transformer T1-1 is connected with the anode of diode D1-1, diode D1-1
Cathode connect with one end of the anode of polar capacitor C2, one end of resistance R1-2, one end of resistance R1-3 and capacitance C1-4, electricity
The other end of resistance R1-2 is connect with the source electrode of transistor Q1-1, the grid of transistor Q1-1 and one end of capacitance C1-3, resistance R1-
The cathode connection of 3 other end, zener diode VR1-1, the drain electrode of transistor Q1-1 control core with the other end of capacitance C1-3
The FB pins of piece U1-2 connect.The other end of transformer output end and the other end of capacitance C1-2, the sun of zener diode VR1-1
One end connection of pole, the other end of capacitance C1-4, the S pins of control chip U1-2, capacitance C1-1, the other end of capacitance C1-1 with
Control the BP pins connection of chip U1-2.The flyback uses the voltage-stabiliser tube V of a PNP pipe and a 12VR1Feedback circuit is constituted,
When output voltage is more than 12V, PNP pipe is connected at this time, and the electric current for being more than 49 μ A at this time inputs FB pins, and PNP, which rises, adjusts voltage
Effect.Using this feedback controling mode, it is ensured that the pin that the maximum value of voltage can not be more than the VCC of control chip U1 is most
Big value 13.4V.
Preferably, LLC resonance modules include the control chip U2-1, capacitance C2-2, transformation of built-in two MOSFET
Device secondary windings NA, booster diode and transformer secondary switch QA, booster diode includes diode DA1 and diode
DA2.The transformer secondary output winding N of transformer T2-1AIt is all connected with diode, wherein transformer with transformer main winding Ns
Grade winding NATwo ends be separately connected the anode of diode DA1 and diode DA2, the cathode of diode DA1 and diode DA2
It is connect with one end of the switch QA of transformer secondary, the other end and the transformer main winding of the switch QA of transformer secondary
One end connection of the anode, capacitance C2-3 of the diode of Ns connections, the other end of capacitance C2-3 and one end of transformer T2-1,
One end of LLC feedback circuits connects.The one of the other end of LLC feedback circuits and the FB pins of control chip U2-1, capacitance C2-4
The DT/BF pins of end connection, control chip U2-1 are connect with one end of resistance R2-2, the other end and the resistance R2-4 of resistance R2-2
One end, control chip U2-1 the connection of VREF pins, maximum frequency when for dead time is arranged, starts and burst threshold
Frequency.The G pins and one end of the other end of capacitance C2-4, the other end of resistance R2-4, resistance R2-3 for controlling chip U2-1 connect
It connects, the OV/UV pins of control chip U2-1 are connect with one end of the other end of resistance R2-3, resistance R2-1, control chip U2-1
D pins connect with the other end of resistance R2-1, the VCC pin of control chip U2-1 is connect with the anode of diode D2-1, two
The cathode of pole pipe D2-1 connect with one end of the control VCCH pins of chip U2-1, capacitance C2-1, the other end of capacitance C2-1 and
Control one end connection of the HB pins, capacitance C2-2 of chip U2-1, the other end of capacitance C2-2 and wherein the one of transformer T2-1
The wherein other end of end connection, transformer T2-1 is connect with one end of the IS pins of control chip U2-1, resistance R2-5, resistance
The other end of R2-5 is connect with the S1/S2 pins of control chip U2-1.
Preferably, output power is the LLC resonance converters of 150W as needed, it is contemplated that its efficiency eta is 95%,
The highest input power P of input can be obtained by (2.1) formulain maxFor 157W：
Since LLC-SRC input voltages are the rated output voltage V provided by prime power factor correctorOPFC, by
(2.1) formula can determine the value of minimum input voltage.
Wherein, PinFor input power, COFor the bulky capacitor of output；THUIt is holding time, application of the retention time in power supply
Upper most important effect is exactly the switching of UPS (uninterruptible power supply), and general value is between 16-20ms, here by THUValue
For 17ms.The bulky capacitor of active power factor correcting module output at this time can be 100uF with value, and numerical value is substituted into formula (2.2),
It can obtain the voltage V of input minimum at this timein minFor 305V.There are two the ranges of input voltage for regulation at this time, they distinguish
It is the input voltage of 340~305V of 385~340V of nominal range and low pressure range.OV/UV pins are whether detection voltage is over-pressed
Or under-voltage pin, OV/UV pin standard voltage values are 2.4V, therefore resistance R2-1 and resistance R2-3 is taken as respectively
2.9M Ω and 20k Ω, it is to start threshold value 331V to reach input voltage.VOVHOvervoltage shutdown threshold value generally takes the 131% of normal voltage
(458V), VOVLOvervoltage restores 126% (441V), V that threshold value takes standard valueSDHUnder-voltage startup threshold value takes standard value 350V, VSDLIt owes
Pressure shutdown threshold value takes 79% (276V) of standard value.When powering on, with the raising of the voltage at capacitance both ends, control chip IC will be
Capacitance both end voltage is equal to VSDHWhen start to work.If control chip U1 has started to work and input voltage is declining, it will be
Voltage is equal to VSDLIt is turned off when (the minimum input voltage of design).If instead control chip U1 has started to work and input voltage
Rising, it will be equal to V in voltageOVHIt is turned off when (maximum input voltage of design).
Preferably, in the case where considering the secondary leakage inductance of transformer, the obtained voltage gain of Fig. 3 can indicate
For：
Wherein, ω is the work angular frequency of converter；ωoIt is the resonance angular frequency that Lr and Cr are determined, and Lr=Lr+
Llkp；Cr refers to the existing capacitance of transformer itself in Fig. 3, and Lr is the inductance value on the left of transformer；LlkpIt is primary leakage inductance；k
It is the coefficient of the variation of limit switch frequency；ω p are the resonance angular frequencies that Lp and Cr are determined, and Lp=Llkp+Lm//
(n2Llks)；Lp is the inductance value on the right side of transformer；LlksSecondary leakage inductance；LlkpIt is primary leakage inductance；Lm is magnetizing inductance；Q is quality
Factor, reflection be LLC design quality, Q values are higher, and it is better to represent circuit design；J, a is constant factor.
Wherein Rac refers to the equivalent resistance of all components of direct current component, value by direct current component power and electric current
It obtains；
Under conditions of DC current gain when meeting low input, the rational combination for selecting Q values and k values may be implemented
Efficient design.
In the case that Fig. 6 gives identical k values, the gain situation under different Q value.As Q reduces (such as load reduction), most
High gain frequency can be gradually close to fp, and peak gain also gradually increases.As Q rises (as load increases), highest-gain
Frequency can be close to fo, and peak gain declines therewith.Therefore when designing LLC resonance circuits, consider that full load situation is small
The worst situation will be considered by being design resonant network.
The value of k values is generally determined by resonant frequency and resonant capacitance.For the variation of limit switch frequency, design
When generally working frequency fs is operated near resonant frequency fr1.When input voltage is by active power factor correcting module electricity
When road output provides, rated output when maximum input voltage is active power factor correcting module normal operation circuit.Change
Working frequency in the case of parallel operation maximum input voltage is equal with resonant frequency, is ensuring that working frequency fs is small at runtime in this way
In equal to resonant frequency fr1, due to fs=fr1, gain M is represented by：
Lm：Magnetizing inductance；LlkpIt is primary leakage inductance；K is the coefficient of the variation of limit switch frequency；
Select suitable k values that can obtain higher efficiency, k values more low gain is bigger, but dropping low k-value means to encourage
Magnetoelectricity sense Lm is reduced, and small Lm can cause high root-mean-square value (RMS) electric current of switching tube and transformer coupled property poor, cause to convert
The whole efficiency of device is low.Generally by L when designmAnd LlkpRatio k 5~10, there is auxiliary since the design uses
The compensation circuit of retention time, it is possible to higher k values be taken to improve the efficiency of LLC resonance oscillation semi-bridges.By studying and obtaining,
The value of the design k is satisfactory for 9, so the least gain M in nominal input rangeminIt is obtained according to formula (2.6)
It arrives
Maximum gain MmaxAs shown in formula (2.7)
Wherein Vin minFor minimum input voltage, Vin maxFor maximum output voltage.
It takes 10~15% reserved space again generally in maximum gain, therefore gain M is taken as 1.35.It corresponds on figure
It can show that Q values at this time are 0.43.The maximum and minimum value of 340~307V of low pressure input range is substituted into formula (2.6) again
With formula (2.7), M can be found out respectivelyminAnd MmaxValue be 1.11 and 1.22, with the basic phase of DC current gain nominally inputted
Together, so the gain M of value is also 1.25.
Preferably, because commutated network uses half-wave rectifier, the voltage of secondary transformer output is
48.6V, then in nominal input voltage range, the turn ratio of transformer is：
Wherein, VFIt is the pressure drop of secondary side Schottky diode, value is generally 0.6V；Np is the circle on the left of Fig. 3 transformers
Number, Ns are the number of turns on the right side of transformer；Vo is the output voltage on the right side of transformer.
By formula (2.9), it can be deduced that the primary equivalent load impedance R of transformerac, i.e. all components of direct current component
Equivalent resistance.
Wherein, ROFor the load that output resistance namely exports, so obtaining RacIt is 239 in the equiva lent impedance of full load
Ω。
The k values and Q values taken according to previous step will ensure enough peak gains, and determine resonance by k values and Q values
Parameter Cr, Lr and Lp in network, Cr refers to the existing capacitance of transformer itself in Fig. 3, and Lr is the inductance on the left of transformer
Value, Lp are the inductance value on the right side of transformer；Determine that the value of resonant network parameter is as follows by k the and Q values of selection：
Wherein, fr1Be LCC circuits schematic diagram in, one in two resonant frequencies present in resonant network therein
A, wherein schematic diagram is as shown in figure 8, the formula of two resonant frequencies is as follows：
Wherein fr1It is the inductance L in Lr and Cr i.e. figureRWith capacitance CRIt is formed, and fr2It is the electricity in Lr, Cr and Cp i.e. figure
What sense LR, capacitance CR and capacitance Cp were formed.
At low pressure input range (307~340):By above formula, maximum input voltage becomes 340V at this time.
By the way that transformer turn ratio n becomes smaller at this time known to formula (2.8), the change of the turn ratio (n) causes equiva lent impedance Rac also to change therewith
Become, n and Rac at this time are respectively 3.9 and 182 Ω.Due in 307~340VdcInput range when, the component of resonant network
It is to immobilize, so RacThe reduction of value results in the increase of Q values, show that Q values are 0.50 by formula (2.5).
Preferably, the design of most LLC converters requires dead time (TDead-Times) between 300ns and
Between 360ns, this project dead time is set as 340ns.fMAXMaximum internal clock frequency depends on dead band time setting, relationship
Following formula：
270000 be exactly 270Khz, is the fully loaded switching frequencies of LLC, is parameter design value；Due to TDead-TimesValue is
340ns, so the maximum internal clock frequency for obtaining out is 794kHz.Frequency (f_ is restarted due to maximum switching frequency
Burst_start) and shutdown frequency (f_burst_stop) and maximum internal clock frequency relationship it is as shown in table 1：
1 internal clock frequencies of table and the relationship for restarting frequency and shutdown frequency
Wherein mode setting is determined by the resistance of VREF and DT/BF pins.Different RBURSTAnd RFMAXRatio
Value, determines different operating modes.Their corresponding relationships are as shown in table 2：
The relationship of table 2 value and pattern
This programme selection mode is operating mode 2, that is, RBURSTAnd RFMAXIt is taken as 52.3k Ω and 5.9k Ω respectively.This
When they restart frequency (f_burst_start) and shutdown frequency (f_burst_stop) be respectively 297kHz and 347kHz.
When frequency, which drops to, restarts frequency, IC is to restart frequency work operation, and when frequency increases to shutdown frequency, IC is stopped.
Such as load reduces when normal work, frequency rises to 347KHz, and control IC will be stopped, this can cause under output voltage
It drops, the feedback pin electric current in backfeed loop reduces.When feedback pin electric current to the value corresponding to 297KHz, control IC will be weighed
New to start to work, limitation is controlled the maximum frequency of the work of IC by such iterative cycles.
Minimum frequency of operation is related to the resistance between FB pins with VREF pins, and LLC is controlled the minimum of IC by this programme
Working frequency is set as 172kHz, as long as set frequency is slightly below the switching frequency in fully loaded and minimum input voltage.
Preferably, LLC feedback circuits include photoisolator UB, resistance ROPTO；One end of photoisolator UB with
One end connection of the anode, resistance RLOAD of diode Dk, cathode and the resistance R of diode DkOPTOOne end connection, resistance ROPTO
The other end and resistance RSTARTOne end, capacitance CFBOne end connection, capacitance CFBThe other end and resistance RLOADThe other end connect
It connects, resistance RSTARTThe other end and resistance RFMINOne end, polarized capacitance CSTART cathode connection, polarized capacitance
The anode of CSTART is connect with the other end of the other end of resistance RFMIN, photoisolator UB.Resistance RFMINBy polarized capacitance
CSTARTBypass to provide output soft start during startup, due to it is initial when polarized capacitance CSTARTOn voltage be zero, at this time
FB pins on high current by resistance RSTARTIt determines, so the original frequency of soft start is equal to set maximum switch frequency at this time
Rate.So selection resistance RSTARTSelect the resistance of 5.11k Ω.
Resistance ROPTOThe maximum optocoupler electric current that the FB pins for flowing into control chip U2-1 can be limited, so general ROPTOChoosing
Select the resistance of 1.2k Ω.Capacitor CFBThe FB pins for controlling chip U2-1 can be filtered, because of this programme selection work frequency
Rate is 250kHz, so capacitor CFBValue be 4.7nF.Resistance RLOADThe output that optical coupler can be loaded, to force it with phase
It works higher quiescent current, to improve its gain, so resistance RLOADGeneral value is 4.7k Ω.Diode D1
Effect in circuit is by ROPTOIt is come out from soft start Network Isolation.
Preferably, buck converter module includes control chip U3-1, resistance R3-1, resistance R3-2 and LED light.Institute
It states and connects resistance R3-1 between the control chip U3-1 the 4th, 5 pins, the 4th pin of control chip U3-1 and the one of resistance R3-2
3rd pin of end ground connection, control chip U3-1 is connect with the other end of resistance R3-2.Draw the 1st, the 2 of the control chip U3-1
Capacitance C3-1 is connected between foot, and controls the 2nd pin ground connection of chip U3-1, and the 6th pin of control chip U3-1 is for exporting
7th pin of PWM driving control signal, control chip U3-1 is connect with the anode of one end of inductance L3-1, diode D3-1, is controlled
The 8th pin of coremaking piece U3-1 is connect with one end of the cathode of diode D3-1, one end of LED light, capacitance C3-2, capacitance C3-2
Other end ground connection, the other end of LED light connect with the other end of inductance L3-1.The switching frequency of chip U3-1 is controlled by outside
Resistance R3-1 determines that relation formula is as follows：
Wherein R is that resistance R3-1, f are switching frequency；The value range 250KHz-1MHz of switching frequency, so resistance R3-
1 resistance value is 20k Ω；If the too big frequency of selection can increase loss, output current ripple is too big if frequency is too small.
Resistance R3-2 determines that the size of current of LED light is flowed through in setting, and relation formula is as follows：
Wherein R3-2 is the resistance value of resistance R3-2, ILEDFor the size of current of LED light, because electric current size ranging from
350mA<ILED<1A, so resistance R3-2 selection 3.2k Ω.I at this timeLEDSize of current be 980mA.
Wherein, PWM light modulations may be implemented in the buck converter module.When the pin of adjusting is high level, arteries and veins
The pulse f for rushing level modulation just starts to work, so shown in the following formula of the average current for flowing through LED light.
ILED-AVG=ILED×D
D can be achieved on the duty ratio of the pin input PWM of PWM light modulations.Buck converter module is by changing average electricity
The size of stream realizes the adjusting of LED luminance.
Minimum output voltage VLED(MIN)Determination be is determined by minimum turn-on time, wherein minimum turn-on time is
400ns, relationship such as following formula determine：
Wherein, when the size of the pulse f of impulse level modulation is 500KHz, input VINSize be LED driving output electricity
48V is pressed, so as to show that the voltage of LED minimums output is 8V, the series connection of buck converter module output end is determined with this
LED number.
Wherein, the size of inductance L3-1 affects the size of output current ripple, rational that inductance L3-1 is selected to make ripple
Within the scope of defined.The minimum value of inductance L3-1 by determining as follows：
Wherein, VINFor 48V input voltages；VMINFor LED output minimum voltage, since LED both end voltages are with the liter of temperature
High voltage reduces, and 14 LED series connection output minimum voltages are 42V at high temperature；R is the ripple factor of electric current, and general value is
0.4.The switching frequency of fsw N-MOSFET pipes built in chip U3-1 in order to control.ILEDFlow through the size of current of LED light.
Thus show that the minimum inductance of inductance L3-1 is 33.4uH, in order to make ripple reduce, so selecting volume for 7.8*
7*5mm sizes are that the I-shaped patch power inductance of 68uH is preferred.To which peak value can be obtained out by determining inductance L3-1
The value of electric current, shown in following formula,
Wherein VINIt is input voltage, VMINFor the minimum voltage of LED outputs, L is the inductance value of inductance L3-1, and f is buck
Conversion module switching frequency, ILEDFlow through the size of current of LED light.
The peak I of electric current to obtainPEAKFor 1.07A, and such peak point current is reasonable acceptable range.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, without departing from the inventive concept of the premise, can also make several improvements and modifications, these improvements and modifications also should be regarded as
In the scope of the present invention.
Claims (9)
1. the great power LED system based on remote control, which is characterized in that including EMI rectification filtering modules, active power factor
Correction module, LLC resonance modules, buck converter module and feedback control module；EMI rectification filtering modules and feedback control mould
Block is electrically connected, and EMI rectification filtering modules, LLC resonance modules, feedback control module and active power factor correcting module are electrical
Connection, buck converter module, feedback control module and LLC resonance modules are electrically connected；EMI rectification filtering modules are by voltage wave
Shape is converted into the voltage oscillogram of similar steamed bun shape, and active power factor correcting module receives the transmission of EMI rectification filtering modules
Voltage oscillogram, and output is converted as fixed value voltage, fixed value voltage is converted to buck converter module and run by LLC resonance modules
The constant voltage needed, voltage oscillogram, fixed value voltage and constant voltage all carry out Real-time Feedback by feedback control module, this is anti-
Feedback carries out output adjustment for active power factor correcting module, LLC resonance modules.
2. the great power LED system according to claim 1 based on remote control, it is characterised in that：Active power factor
Correction module includes inductor L1, diode D2 and control chip U1；Control the D pins of chip U1 and one end of inductance L1, two
The anode of pole pipe D2 connects, and the cathode of diode D2 is connect with the cathode of diode D1, the anode and power input of diode D2
One end of the rectifier circuit at end connects, and diode D1 is bypass diode, and for charging, serial communication to be to prevent to be switched on just
When resonance generation；It controls chip U1 and control signal is provided, V pins are connect with one end of one end of resistance R2, capacitance C4, electricity
R2 is hindered to detect the rectification AC-input voltage of power supply, and capacitance C4 is to eliminate the noise on signal；The cathode of diode D2 and electricity
One end connection of R1 is hindered, and resistance R1, resistance R3, resistance R7, resistance R9 and resistance R10 are composed in series dividing network for scaling
Output voltage simultaneously provides feedback to control chip U1；Resistance R3 shunt capacitance C1, and the one end that is connect with resistance R10 resistance R3 with
One end of resistance R4 connects, and the other end of resistance R4 is connect with the grid of transistor Q1, source electrode and the transistor Q2 of transistor Q1
Source electrode, one end of resistance R5, one end of resistance R6, resistance R8 one end connection, the other end of resistance R5 is another with resistance R10's
One end connects, and resistance R6 connects with capacitance C6, and the other end and the FB pins of control chip U1, one end of capacitance C7 of resistance R8 connect
Connect, one end of resistance R7 and resistance R9 connections is connect with the grid of transistor Q2, the other end of resistance R9, capacitance C6 it is another
End, the other end of capacitance C7, the other end of capacitance C4, one end of capacitance C5, the drain electrode of transistor Q2 and the G of control chip U1 draw
Foot connects, and the VCC pin of control chip U1 is connect with the drain electrode of the other end of capacitance C5, transistor Q1；The other end of resistance R2
It is connected with the other end of one end of capacitance C3, inductance L1, the other end of capacitance C3 and wherein one end polarity of rectifier circuit
The cathode of capacitance is connected, and the anode of polar capacitor is connect with one end of resistance R1.
3. the great power LED system according to claim 2 based on remote control, it is characterised in that：Resistance R2 selections two
A concatenated fixed carbon resisters of 2M Ω, the patch capacitor of capacitance C4 selection 100nF pressure resistances 50V, resistance R1, resistance R10, resistance R7 and
Resistance R9 is respectively 4M Ω, 2.2K Ω, 2.2K Ω, 57.6K Ω, and capacitance C1 selects the thin-film capacitor of pressure resistance 200V capacitances 100nF,
Resistance R8 and capacitance C7 selects 10 Ω resistance and 10nF capacitances, resistance R6 that 3K Ω, capacitance C6 is selected to select 4.7uF, crystal respectively
Pipe Q1 and Q2 select the NPN of the MMBT4401 of 40V to manage the PNP pipe with MMBT4403 respectively.
4. the great power LED system according to claim 2 based on remote control, it is characterised in that：Control chip U1's
VCC pin is connect with inverse-excitation type auxiliary power circuit, and the inverse-excitation type auxiliary power circuit includes transformer T1-1, transistor
Q1-1 and zener diode VR1-1；The input terminal of transformer T1-1 is connect with the D pins of control chip U1-2, transformer T1-1
One end of output end be connected with the anode of diode D1-1, the cathode of diode D1-1 and anode, the electricity of polar capacitor C2
One end of one end, resistance R1-3 for hindering R1-2 is connected with one end of capacitance C1-4, the other end and the transistor Q1-1 of resistance R1-2
Source electrode connection, the grid of transistor Q1-1 and one end of capacitance C1-3, the other end of resistance R1-3, zener diode VR1-1
Cathode connection, the FB pins that the drain electrode of transistor Q1-1 controls chip U1-2 with the other end of capacitance C1-3 connect；Transformer
The other end of output end and the other end of capacitance C1-2, the anode of zener diode VR1-1, the other end of capacitance C1-4, control
One end connection of the S pins, capacitance C1-1 of chip U1-2, the BP pins of the other end and control chip U1-2 of capacitance C1-1 connect
It connects.
5. the great power LED system according to claim 1 based on remote control, it is characterised in that：LLC resonance modules packets
Include control chip U2-1, capacitance C2-2, the transformer secondary output winding N of built-in two MOSFETA, booster diode and transformer time
The switch QA of grade side, booster diode includes diode DA1 and diode DA2；The transformer secondary output winding N of transformer T2-1A
It is all connected with diode, wherein transformer secondary output winding N with transformer main winding NsATwo ends be separately connected diode
One end of the anode of DA1 and diode DA2, the switch QA of the cathode and transformer secondary of diode DA1 and diode DA2 connects
It connects, anode, the capacitance C2-3 of the other end and the transformer main winding Ns diodes connecting of the switch QA of transformer secondary
One end connection, the other end of capacitance C2-3 connect with one end of one end of transformer T2-1, LLC feedback circuits；LLC feedback electricity
The other end on road connect with one end of the control FB pins of chip U2-1, capacitance C2-4, the DT/BF pins of control chip U2-1 and
One end of resistance R2-2 connects, and the other end of resistance R2-2 and the VREF pins of one end of resistance R2-4, control chip U2-1 connect
It connects, maximum frequency when for dead time is arranged, starts and burst threshold frequency；Control the G pins and capacitance of chip U2-1
One end connection of the other end of C2-4, the other end of resistance R2-4, resistance R2-3, OV/UV pins and the electricity of control chip U2-1
One end connection of the other end, resistance R2-1 of R2-3 is hindered, the D pins of control chip U2-1 are connect with the other end of resistance R2-1,
The VCC pin of control chip U2-1 is connect with the anode of diode D2-1, and the cathode of diode D2-1 is with control chip U2-1's
One end connection of VCCH pins, capacitance C2-1, the HB pins of the other end of capacitance C2-1 and control chip U2-1, capacitance C2-2
One end connects, and the other end of capacitance C2-2 connect with wherein one end of transformer T2-1, the wherein other end of transformer T2-1 and
Control one end connection of the IS pins, resistance R2-5 of chip U2-1, the S1/S2 of the other end and control chip U2-1 of resistance R2-5
Pin connects.
6. the great power LED system according to claim 5 based on remote control, it is characterised in that：LLC feedback circuit packets
Include photoisolator UB, resistance ROPTO；One end of photoisolator UB and one end of the anode of diode Dk, resistance RLOAD connect
It connects, the cathode of diode Dk is connect with one end of resistance ROPTO, the other end of resistance ROPTO and one end of resistance RSTART, electricity
Hold one end connection of CFB, the other end of capacitance CFB is connect with the other end of resistance RLOAD, the other end and the electricity of resistance RSTART
One end of RFMIN, the cathode connection of polarized capacitance CSTART are hindered, the anode of polarized capacitance CSTART is with resistance RFMIN's
The other end connection of the other end, photoisolator UB.
7. the great power LED system according to claim 6 based on remote control, it is characterised in that：The resistance R2-1
2.9M Ω, resistance R2-3 is selected to select 20k Ω, resistance ROPTO that 1.2k Ω, capacitance CFB is selected to select 4.7nF, resistance RLOAD choosings
Select 4.7k Ω.
8. the great power LED system according to claim 1 based on remote control, it is characterised in that：Buck converter mould
Block includes control chip U3-1, resistance R3-1, resistance R3-2 and LED light；It controls the 4th of chip U3-1, connect electricity between 5 pins
R3-1 is hindered, the 4th pin of control chip U3-1 is grounded with one end of resistance R3-2, the 3rd pin and resistance of control chip U3-1
The other end of R3-2 connects, control chip U3-1 the 1st, connect capacitance C3-1 between 2 pins, and control the 2nd of chip U3-1
Pin is grounded, the 6th pin of control chip U3-1 for exporting PWM driving control signal, the 7th pin of control chip U3-1 with
One end of inductance L3-1, the anode connection of diode D3-1, the 8th pin of control chip U3-1 and the cathode of diode D3-1,
One end of LED light, one end connection of capacitance C3-2, the other end ground connection of capacitance C3-2, the other end of LED light is with inductance L3-1's
The other end connects.
9. the great power LED system according to claim 8 based on remote control, it is characterised in that：Resistance R3-1 is determined
Switching frequency, relation formula are as follows：
Wherein R is that resistance R3-1, f are switching frequency；The value range 250KHz-1MHz of switching frequency, so resistance R3-1
Resistance value is 20k Ω；
Resistance R3-2 determines that the size of current of LED light is flowed through in setting, and relation formula is as follows：
Wherein R3-2 is the resistance value of resistance R3-2, and ILED is the size of current of LED light, because of the ranging from 350mA of the size of electric current<
ILED<1A, so resistance R3-2 selection 3.2k Ω.
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| KR101289829B1 (en) * | 2013-02-26 | 2013-07-24 | 주식회사 금영 | Led road light system which can be expected its life |
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