CN108702823A - LED drive circuit, LED light device and electronic equipment - Google Patents
LED drive circuit, LED light device and electronic equipment Download PDFInfo
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- CN108702823A CN108702823A CN201780009035.3A CN201780009035A CN108702823A CN 108702823 A CN108702823 A CN 108702823A CN 201780009035 A CN201780009035 A CN 201780009035A CN 108702823 A CN108702823 A CN 108702823A
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- accumulator
- led light
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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
- H05B45/3725—Switched mode power supply [SMPS]
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
-
- 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
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
-
- 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
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- 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
Inhibition from mutation resistance is arranged in a kind of LED drive circuit, including rectification circuit (101), filter circuit (102) and DC conversion modules (103), the rectification circuit (101);The DC conversion modules (103) include switching circuit, accumulator (4), constant-current control circuit and resonance feedback circuit (2), pulsating direct current is powered for accumulator (4), the accumulator (4) connects the constant-current control circuit, the output of the constant-current control circuit connects the LED light emitting device (104), the switching circuit connects resonance feedback circuit (2), which couples the accumulator (4);When the alternating current passes through rectified current, the inhibition from mutation resistance inhibits surge current, the electric energy magnetic energy variation of resonance feedback circuit (2) resonance accumulator (4) and to switching circuit input feedback electric current, when instantaneous feedback current changing rate level off to zero when, the switching circuit ends, when the instantaneous induced voltage change rate of the accumulator (4) level off to zero when, switching circuit conducting.
Description
Technical field
This application involves LED (light emitting diode) lighting technical fields, and in particular to a kind of LED that electronic interferences are low drivings
Circuit, LED light device and electronic equipment.
Background technology
As automation equipment increasingly enters into the routine work and life of people, the application of door lifter is also more and more general
And.
Existing door lifter application schematic diagram is as shown in Figure 1, the remote signal that remote controler is sent out, remote control signal receiving module
Remote signal is received, control module carries out switch motion with lighting device on the door according to the remote signal of reception.Existing door lifter
Lighting device generally use incandescent lamp, because incandescent lamp is noiseless to application scenario, so remote controler is to leave door machine far
The remote signal that range transmission goes out, the remote control signal receiving module can be received accurately and be carried out on the door with lighting device
Control.LED light device has many advantages, such as environmentally friendly, energy saving, long lifespan and is considered as 21 century lighting source, has started to replace
Conventional light source (such as incandescent lamp) is widely applied on various lighting devices.It, only need to will be traditional white in door lifter application scenario
Vehement lamp replaces with LED light.But when being remotely controlled control with the split door machine of remote controler after replacing, remote control distance can be significantly
Shorten.LED light device, which is differently LED with conventional light source as new environmentally friendly light source, cannot connect alternating current and directly drive, need
It to be driven by AC-DC constant-current driving power supplies.And the high-frequency signal of the LED light device driving power will produce electromagnetism and do
It disturbs, which influences the remote signal that remote controler is sent out.This, which is exactly LED light device, can not be advantageously used and opening
The reason of door machine application scenario.
Referring to FIG. 2, existing LED light device includes lamp housing 20 and the driving circuit being arranged in lamp housing 10 and by driving
Dynamic circuit provides the LED module 30 of power supply.The driving circuit 10 includes rectification circuit 11, filter circuit 12 and DC conversion circuits
13.The physical circuit figure of existing DC conversion circuits 13 please refers to Fig.3.
Input voltage is from the ACN of rectification circuit 11, and the both ends ACL input, using rectifier bridge BR1 progress rectifications;After rectification
The filtered circuit of voltage 12 be filtered to obtain the clean pulsating direct current of comparison;It is obtained finally by DC conversion circuits 13
To required voltage.
The drive circuit works of LED light device under high frequency mode, generate major electromagnetic interference.Existing LED illumination
Device circuit mostly uses greatly scheme of the chip as the governor circuit of driving circuit, as Fig. 3 DC conversion circuits 13 use
BP2831A chips, because there is chip solution the operating mode itself having by oneself, the interference of generation to need to increase filter circuit ability
Meet product certification interference requirement, though meet certification interference requirement product interference it is still not small, door lifter occasion can not
Support remote controler remote control.Need to increase a large amount of interference filter component to further decrease interference, cause cost and
Small product size increases, and cannot be satisfied the demand of products application.Just because of this, existing LED light device, which can not use, to be opened
Door machine etc. is to the low-down occasion of interference requirement.
Therefore, the LED light device of the prior art needs to improve.
Invention content
The application technical problems to be solved are to provide one kind and can inhibit current break, and electromagnetic interference (EMI) is dropped to most
Low LED drive circuit and LED light device and electronic equipment using the LED drive circuit.The LED drive circuit works
In quasi-resonance operating mode, external electromagnetic interference is very low.
In order to solve the above technical problems, the application provides following technical scheme.
In a first aspect, the embodiment of the present application provides a kind of LED drive circuit, including rectification circuit, filter circuit and
DC conversion modules, the rectification circuit convert alternating current to direct current, which is filtered place to the direct current of conversion
Reason obtains pulsating direct current, which provides rated voltage based on the pulsating direct current for LED light emitting device, the rectification circuit
Including inhibition from mutation resistance;
The DC conversion modules include switching circuit, accumulator, constant-current control circuit and resonance feedback circuit, the pulsation
Direct current is powered for accumulator, which connects the constant-current control circuit, and the output of the constant-current control circuit connects the LED
Luminescent device, the switching circuit connect resonance feedback circuit, which couples the accumulator;
When the alternating current passes through rectified current, which inhibits surge current, the resonance feedback circuit resonance
The electric energy magnetic energy of the accumulator changes and to switching circuit input feedback electric current, when instantaneous feedback current changing rate levels off to zero
When, the switching circuit cut-off, when the instantaneous induced voltage change rate of the accumulator level off to zero when, switching circuit conducting.
In embodiment, which is arranged at least following any position:The exchange of the rectification circuit is defeated
Enter end and/or DC output end.
The DC conversion modules further include start-up circuit, which connects the start-up circuit, which includes protecting
Demonstrate,prove the start-up resistor of the switching circuit lightly conducting.
When it is implemented, the ac input end of the rectification circuit includes input zero line and input zero line side, it is described whole
The DC output end of current circuit includes direct current output positive terminal and direct current output negative pole end, the input firewire of the rectification circuit
At least one of end, input zero line side, direct current output positive terminal and direct current output negative pole end are provided with for inhibiting electric current prominent
The inhibition from mutation resistance of change, at least one total resistance value of inhibition from mutation resistance of the rectification circuit setting is at 15-200 ohm.
Preferably, which is fuse resistance or is the common electricity of fuse resistance series connection
Resistance.
Second aspect, the embodiment of the present application also provides a kind of LED light devices, including LED light emitting device and such as LED
The LED drive circuit of driving circuit claim.
The third aspect, the embodiment of the present application also provides a kind of electronic equipment, including:
At least one controller;And
Interactive unit, control mechanism and the LED light device communicated to connect at least one controller, wherein should
Controller is sent to the instruction of interactive unit according to user, manipulates the control mechanism and is turned on or off LED illumination dress
It sets;
The LED light device includes the LED drive circuit as described in LED drive circuit claim.
The electronic equipment further includes the memory and communication component communicated to connect at least one controller.
The advantageous effect of the application is that LED drive circuit provided by the embodiments of the present application and use LED drivings are electric
The LED light device and electronic equipment on road, the LED drive circuit are operated in quasi-resonance operating mode, also, in rectification circuit
Inhibition from mutation resistance is set, and external electromagnetic interference is very low.The LED drive circuit works as resonance by the way that resonance feedback circuit is arranged
The instantaneous feedback current changing rate of feedback circuit level off to zero when, the switching circuit cut-off, when the instantaneous induction of the accumulator
Voltage change ratio level off to zero when, switching circuit conducting so that current changing rate d of the circuit of high-frequency work in switching instant
I/dt and voltage change ratio dv/dt are minimum, and to fundamentally reduce electromagnetic interference source, the electromagnetism for greatly reducing circuit is dry
It disturbs, and to use the wireless telecommunications of the corresponding electronic equipment of this kind of New LED driving circuit unaffected.
Description of the drawings
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element with same reference numbers label is expressed as similar element in attached drawing, removes
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 be the invention relates to door lifter Working mould block diagram;
Fig. 2 is existing LED light device schematic diagram;
Fig. 3 is the circuit diagram of the DC conversion modules of existing LED light device;
Fig. 4 is the equivalent circuit diagram of DC conversion modules provided by the embodiments of the present application;
Fig. 5 is the circuit diagram of DC conversion modules provided by the embodiments of the present application;
Fig. 6 is the circuit block diagram of the DC conversion circuits of DC conversion modules provided by the embodiments of the present application;
Fig. 7-14 is 8 kinds of embodiment party of the resistance that rectification circuit setting provided by the embodiments of the present application inhibits surge current
Formula;And
Figure 15 is the hardware module figure of electronic device provided by the embodiments of the present application.
Specific implementation mode
It is with reference to the accompanying drawings and embodiments, right in order to make the object, technical solution and advantage of the application be more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, not
For limiting the application.
This application involves the electronic equipments of LED light device and the use LED light device, and application embodiment is to open the door
Machine is illustrated as the embodiment of electronic equipment.Referring to FIG. 1, the door lifter of the application includes remote controler, remote signal
Receiving module, control module, LED light device and door.The remote signal that remote controler is sent out, remote control signal receiving module receive
Remote signal, control module carry out switch motion with LED light device on the door according to the remote signal of reception.Wherein, which shines
Bright device electromagnetic interference is very small, does not influence the communication between remote controler and remote control signal receiving module.
The existing electronic equipment with LED light device, system construction is more and more numerous and more jumbled, in addition to controlling the control of itself
Mechanism, it is also necessary to can be with system communication and by the management and running of system.LED light device provided by the present application LED driving electricity
Road is operated in quasi-resonance operating mode, and electronic interferences reduce to minimum, does not influence remote control and the wireless communication of electronic equipment.
LED light device is generally used and Switching Power Supply and is worked under high frequency mode, capacitor charge and discharge, switching tube electricity
Pressure, electric current being switched fast in high-frequency work constitute electromagnetic interference source.The Switching Power Supply generates the basic original of electromagnetic interference
Because being to generate very high current changing rate (variation of electric current in the unit interval, d i/dt) and voltage change in its course of work
Rate (variation of voltage, dv/dt in the unit interval), the surge current and peak voltage accordingly generated forms interference source.This Shen
Technical solution please current changing rate and voltage change ratio almost level off to zero when, switching circuit is just switched off and on, almost
Zero d i/dt or the dv/dt change rates of leveling off to make the driving circuit of the application reduce interference source, electromagnetic interference to greatest extent
Have substantial degradation, and can guarantee that the wireless telecommunications of electronic equipment using the LED light device are unaffected.
Please refer to Fig.4 physical circuit figure shown in shown equivalent circuit diagram and Fig. 5.The LED light device of the application includes
LED light emitting device 104 and LED drive circuit.The LED drive circuit is operated in quasi-resonance operating mode, and external electromagnetism is dry
Disturb very low, including rectification circuit 101, filter circuit 102 and DC conversion modules 103.
The DC conversion modules 103 include start-up circuit 1, resonance feedback circuit 2, observation circuit 3, accumulator 4 and perseverance
Flow control circuit.The accumulator 4 includes switching circuit, and in the embodiment of the present application, which is to be operated in saturation conduction
Under switching tube Q1.The switching circuit connects resonance feedback circuit 2, which couples the accumulator 4, the storage
Energy circuit 4 connects the constant-current control circuit, and the output of the constant-current control circuit connects the LED light emitting device 104.
Wherein, which connects the start-up circuit 1, which includes ensureing the switching circuit lightly conducting
Start-up resistor.
The rectification circuit 101 converts alternating current to direct current, which filters the direct current input of conversion
Wave handles to obtain pulsating direct current, and it is that the LED light emitting device 104 provides specified work which, which is based on the pulsating direct current,
Make voltage.
The electric energy magnetic energy variation of 2 resonance of the resonance feedback circuit accumulator 4 and to switching circuit input feedback electric current,
When instantaneous feedback current changing rate d i/dt level off to zero when, the switching circuit cut-off, when the instantaneous induced electricity of the accumulator
Buckling rate dv/dt level off to zero when, switching circuit conducting;Wherein, it is constant current by the pulsating direct current when switching circuit conducting
Control circuit provides electric energy, and energy is provided by the accumulator for constant-current control circuit when which ends.
Referring to FIG. 6, showing the circuit block diagram of the DC conversion modules of the embodiment of the present application.Wherein, start-up circuit 1 is to take
It is worth larger resistance, plays the role of forming a connecting link, ensures switching tube Q1 lightly conductings.The start-up circuit 1 is started by minimum of one
Resistance R2 compositions.
The resonance feedback circuit 2 includes a winding of transformer T1, minimum of one oscillating capacitance C3, minimum of one driving
Resistance R4.
The detection circuit 3 is used for output power, including minimum of one detection resistance R1.
The accumulator 4 includes a winding of minimum of one capacitance C4, transformer T1, switching tube Q1, minimum of one two
Pole pipe D1.
The resonance feedback circuit 2 is so that DC conversion modules 103 are operated in quasi-resonance operating mode, and external interference is very
It is low.
Operation principle is following (being illustrated with BUCK circuits):
The alternating voltage of input is converted into the DC voltage of pulsation by rectification circuit 101 by input voltage, using whole
The towering type filter circuit of current circuit 102 is filtered the pulsating volage after rectification.The DC conversion modules 103 will pulse electric
Pressure is converted into our required voltages.
Switching tube Q1 is operated in the state of On-Off Rapid Circulations conversion, dv/dt and d i/dt phases in change dramatically
Mutually conversion, when transformer T1 induced potentials instantaneously become no-voltage, when switching tube is connected again, i.e. dv in dv/dt is zero,
Namely dv/dt is zero, and generated electromagnetic interference is minimum.When the feedback current of the resonance feedback circuit 2 is zero, the switching tube
When Q1 ends, i.e. d i in d i/dt are zero, that is, d i/dt are zero, the electromagnetic interference which generates on switching tube
Also minimum.During high frequency conversion, the switching of each switch pipe Q1 all occurs when d i/dt are zero or dv/dt is zero,
Therefore electromagnetic interference all very littles of entire driving process.
Referring to Fig. 5, input voltage is from the ends L of AC power, N-terminal both ends input, after rectifier bridge BR1 rectifications, then
By C1, the towering mode filter of L1, C2 composition is filtered, and filtered pulsating dc voltage is carried out by R2, R4, Q1, R1
Circuit start, switching tube Q1 is in lightly conducting state after start-up circuit 1 starts.Transformer T1 by C4 anodes to C4 cathode, then
By 7 to 8 feet of transformer, finally pass through the accumulator 4 that Q1 and R1 is formed.And incude on the transformer one it is 7 positive 8 negative
Voltage can answer a 1 positive 2 negative voltage in 1,2 feel of side winding of the transformer T1 in the resonance feedback circuit 2 simultaneously.
This voltage forms positive feedback by oscillating capacitance C3 to switching tube Q1, and positive feedback can further ensure that switching tube Q1 saturations are led
It is logical.It is slowly increased with the voltage of C3 capacitances, feedback current slowly reduces, but current direction is constant, remains able to ensure switch
Pipe Q1 normallies, the energy of storage continue growing.When C3 capacitance voltages are full of, 2 feed-in of resonance feedback circuit at this time is opened
The feedback current for closing pipe Q1 is zero, and feedback current cannot maintain switching tube Q1 to continue to be connected and make the cut-off of Q1 switching tubes, this is just
It is zero current cut-off.Switching tube Q1 cut-off simultaneously as the electric current on transformer T1 suddenly becomes zero, according to " Lenz's law " this
When transformer T1 on induced voltage can overturn, be that 7 minus 8 just, the magnetic energy of transformer storage at this time is changed into electric energy and passes through
Pin 8 (just) returns to pin 7 (negative) by D1, C4 and releases energy to secondary.The voltage of 1,2 foot of transformer can also turn over simultaneously
Turn, just for 1 minus 2, phase voltage overturns and switching tube Q1 is made further to end.
According to energy theorem:(w indication transformer T1 energy storage total works, i indicate the virtual value of electric current, L to W=(1/2) * L*i*i
Indicate inductance), reduce with the release of secondary energy, electric current reduces.When electric current is reduced to zero, the induction on transformer at this time
Electromotive force can further be overturn, and switching tube Q1 is connected again.Here it is no-voltage conductings.Switching tube Q1 is cut in zero current
Only, it is connected in no-voltage, interference is all relatively low.
The external interference source of LED light device driving embodies a concentrated reflection of switching tube, rectifier diode, high frequency transformer etc..
(1) switching tube
Switching tube is operated in the state of On-Off Rapid Circulations conversion, dv/dt and d i/dt are mutual in change dramatically
Conversion, therefore, switching tube are both the main interference source of field coupling and the main interference source of magnetic coupling, while being also heat
The generating source of noise.
(2) high frequency transformer
It is quick that the interference source of high frequency transformer embodies a concentrated reflection of d i/dt and dv/dt corresponding to leakage inductance and distribution capacity
Cyclical-transformation, therefore high frequency transformer is electric, magnetic coupling important interference source.
(3) rectifier diode
Rectification in Switching Power Supply includes mainly the high-frequency rectification of the low frequency rectification and output stage of input stage, and output stage
High-frequency rectification is sometimes undertaken by fast recovery diode, is undertaken again by controllable synchronous rectification sometimes.Input stage
The interference that low frequency rectifier diode is brought due to fever is mainly reflected in low-frequency range, and the interference source of the high-frequency rectification of output stage
It embodies a concentrated reflection of on reverse recovery characteristic, the interrupted variation of reverse recovery current can be in lead/PCB layout inductance and stray electrical
Higher dv/dt is generated on the inductance such as sense, so as to cause extremely strong electromagnetic interference.
As long as to sum up we are more slack-off the change rate of d i/dt or dv/dt, can all have substantial degradation to electromagnetic interference.
In the present embodiment, the switching point setting of the switching tube of high frequency switching is zero in d i/dt and dv/dt or approached
In zero moment, electromagnetic interference is greatly reduced.
While in order to which surge current, the embodiment of the present application can be inhibited also to inhibit by the way that resistance is arranged on entire circuit
Surge current.
In the embodiment of the present application, in order to further decrease interference, can rectified current 101 ac input end and direct current it is defeated
At least any position of outlet increases one or more resistance, and total resistance value is at 15-200 ohm, as the member for inhibiting current break
Part, have reduces interference effect well.
Please also refer to Fig. 7 to Figure 14, several for showing the application add resistance or insurance in rectification circuit 101
The embodiment of silk resistance.
Several forms that rectification circuit 101 increases resistance are as follows:
Shown in Fig. 7:RF1 only is set at the ends AC power input firewire L;
Shown in Fig. 8:RF1 is set at the ends AC power input firewire L, in the input zero curve N-terminal setting of power grid AC power
R11;
Shown in Fig. 9:RF1 is set at the ends AC power input firewire L, is arranged in rectifier bridge BR1 direct current output positive terminals
R12;
Shown in Figure 10:RF1 is set at the ends AC power input firewire L, is arranged in rectifier bridge BR1 direct current output negative pole ends
R13;
Shown in Figure 11:RF1 is set at the ends AC power input firewire L, R11 is set in AC power input zero curve N-terminal,
R12 is arranged in rectifier bridge BR1 direct current output positive terminals;
Shown in Figure 12:RF1 is set at the ends AC power input firewire L, is arranged in rectifier bridge BR1 direct current output positive terminals
R13 is arranged in rectifier bridge BR1 direct current output negative pole ends in R12;
Shown in Figure 13:RF1 is set at the ends AC power input firewire L, R11 is set in AC power input zero curve N-terminal,
R13 is arranged in rectifier bridge BR1 direct current output negative pole ends;
Shown in Figure 14:RF1 is set at the ends AC power input firewire L, R11 is set in AC power input zero curve N-terminal,
R12 is arranged in rectifier bridge BR1 direct current output positive terminals, and R13 is arranged in rectifier bridge BR1 direct current output negative pole ends.
Wherein, RF1:It can be fuse string one or more resistance, can also be a fuse resistance or one
Or multiple resistance.R11:Can be one or more resistance.R12:Can be one or more resistance.R13:Can be one or
Multiple resistance.
When switching tube is connected, the voltage of power grid input by AC power input firewire L ends, RF1, BR1, R12, C1,
L1, C2, the 8th foot to the 7th foot of transformer input zero curve N-terminal to switching tube, R1, R13, BR1, R11 to power grid AC power.
Moment is connected in switching tube Q1, circuit loop can form prodigious mutation current, and mainly inhibit the member of current break in circuit
Part is the resistance and inductance in circuit.Therefore RF1, R11, R12 and R13 of input terminal have good inhibiting effect to current break,
It is externally interfered to effectively reduce product.
5 are please referred to Fig.1, the application further relates to a kind of electronic equipment 600.600 embodiment of electronic equipment can be opened the door
Machine can also be any single-chip computer control system using the LED light device 650.
The electronic equipment 600 includes at least one controller 610, the people at least one controller 610 communication connection
Machine interactive unit 630, control mechanism and LED light device 650.
Wherein, which is the central processing unit of electronic equipment 600.The controller 610 is sent to people according to user
The instruction of machine interactive unit 630 needs to be turned on or off the LED according to product design while manipulating control mechanism running
Lighting device 650.In one embodiment, which may include being connected to the motor of controller 610 and being driven by motor
Dynamic motor drive mechanism.The motor drive mechanism may include the combination of the gear set and rack for switch gate.In another embodiment,
The control mechanism can also be the cylinder and mechanical arm for connecting controller.
The structure of the LED light device 650 with design as aforementioned LED light device, including accumulator, constant current control
Circuit and resonance feedback circuit processed, electromagnetic interference is low when circuit is run.
The accumulator includes switching circuit, which connects resonance feedback circuit, resonance feedback circuit coupling
The accumulator, the accumulator connect the constant-current control circuit, and the output of the constant-current control circuit connects LED light emitting device.
Wherein, the electric energy magnetic energy variation of the resonance feedback circuit resonance accumulator and to switching circuit input feedback electric current, works as wink
When feedback current change rate level off to zero when, the switching circuit cut-off, when the instantaneous induced voltage change rate of the accumulator becomes
When being bordering on zero, switching circuit conducting;Electric energy is provided for constant-current control circuit by the pulsating direct current when switching circuit is connected, this is opened
When powered-down road cut-off energy is provided for constant-current control circuit by the accumulator.
In other embodiments, which can establish system, therefore the electronics with other related equipment group-net communication
Equipment further includes the memory 620 communicated to connect at least one controller 610 and communication component 640.
Likewise, in order to inhibit surge current, a position of the rectification circuit of the LED light device 650 or multiple positions
Install at least one resistance for inhibiting current break.
This is for inhibiting the resistance specific implementation mode of current break to be at least:One fuse resistance or at least one
Fuse resistance is connected one or more conventional, electric-resistance.
LED drive circuit provided by the embodiments of the present application and the LED light device and electronics for using the LED drive circuit
Equipment, by be arranged resonance feedback circuit, when the instantaneous feedback current changing rate of resonance feedback circuit level off to zero when, the switch
Circuit end, when the instantaneous induced voltage change rate of the accumulator 4 level off to zero when, switching circuit conducting so that high frequency work
The circuit of work is minimum in the current changing rate d i/dt and voltage change ratio dv/dt of switching instant, to fundamentally reduce
Electromagnetic interference source greatly reduces the electromagnetic interference of circuit, and makes the corresponding electronics using this kind of New LED driving circuit
The wireless telecommunications of equipment are unaffected;LED light device provided by the present application can be applied needs low interference in door lifter etc.
The application scenario of product adaptation;Technical scheme increases resistance in rectification circuit and further suppresses current break, drop
Low electromagnetic interference, such as resistance RF1, R11, R12, R13 set by Fig. 8 to Figure 14, by arbitrarily choosing 1 position or more
A position increases one or more resistance, and total resistance value further suppresses current break at 15-200 ohm, and it is dry to reduce electromagnetism
It disturbs.
Finally it should be noted that:Above example is only to illustrate the technical solution of the application, rather than its limitations;At this
It under the thinking of application, can also be combined between the technical characteristic in above example or different embodiment, step can be with
It is realized with random order, and there are many other variations of the different aspect of the application as described above, for simplicity, they do not have
Have and is provided in details;Although the application is described in detail with reference to the foregoing embodiments, the ordinary skill people of this field
Member should understand that:It still can be with technical scheme described in the above embodiments is modified, or to which part skill
Art feature carries out equivalent replacement;And these modifications or replacements, each reality of the application that it does not separate the essence of the corresponding technical solution
Apply the range of a technical solution.
Claims (8)
1. a kind of LED drive circuit, including rectification circuit, filter circuit and DC conversion modules, the rectification circuit is used for will
Alternating current is converted into direct current, and the filter circuit is for being filtered the direct current of conversion to obtain pulsating direct current, institute
It states DC conversion modules and provides rated voltage based on the pulsating direct current for LED light emitting device, which is characterized in that the rectification circuit
Including inhibition from mutation resistance;
The DC conversion modules include switching circuit, accumulator, constant-current control circuit and resonance feedback circuit, the pulsation
Direct current is powered for accumulator, and the accumulator connects the constant-current control circuit, and the output of the constant-current control circuit connects
The LED light emitting device is connect, the switching circuit connects the resonance feedback circuit, and the resonance feedback circuit couples the storage
It can circuit;
When the alternating current passes through rectification circuit, the inhibition from mutation resistance inhibits surge current, the resonance feedback circuit
The electric energy magnetic energy of accumulator described in resonance changes and to switching circuit input feedback electric current, when instantaneous feedback current changing rate becomes
When being bordering on zero, switching circuit cut-off, when the instantaneous induced voltage change rate of the accumulator level off to zero when, it is described to open
Close circuit turn-on.
2. LED drive circuit according to claim 1, which is characterized in that the inhibition from mutation resistance is arranged at least
Following any position:The ac input end and DC output end of the rectification circuit.
3. LED drive circuit according to claim 2, which is characterized in that the DC conversion modules further include start-up circuit,
The switching circuit connects the start-up circuit, and the start-up circuit includes the startup electricity for ensureing the switching circuit lightly conducting
Resistance.
4. according to claim 1-3 any one of them LED drive circuits, which is characterized in that the exchange of the rectification circuit is defeated
It includes input zero line and input zero line side to enter end, and the DC output end of the rectification circuit includes direct current output positive terminal and directly
Flow output negative pole end, input zero line, input zero line side, direct current output positive terminal and the direct current output cathode of the rectification circuit
At least one of end is provided with the inhibition from mutation resistance for inhibiting current break, and the rectification circuit is arranged at least one
The total resistance value of inhibition from mutation resistance is at 15-200 ohm.
5. LED drive circuit according to claim 4, which is characterized in that at least one inhibition from mutation resistance is to protect
Dangerous silk resistance is fuse resistance series connection conventional, electric-resistance.
6. a kind of LED light device, which is characterized in that including LED light emitting device and as described in any one of claim 1 to 5
LED drive circuit.
7. a kind of electronic equipment, wherein including:
At least one controller;And
With man-machine interaction unit, control mechanism and the LED light device of at least one controller communication connection, wherein
The controller is sent to the instruction of man-machine interaction unit according to user, manipulates the control mechanism and is turned on or off institute
State LED light device;
The LED light device includes such as LED drive circuit described in any one of claim 1 to 5.
8. electronic equipment according to claim 7, which is characterized in that further include and at least one controller communication link
The memory and communication component connect.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/085960 WO2018214105A1 (en) | 2017-05-25 | 2017-05-25 | Led driving circuit, led lighting apparatus, and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108702823A true CN108702823A (en) | 2018-10-23 |
Family
ID=63844100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780009035.3A Pending CN108702823A (en) | 2017-05-25 | 2017-05-25 | LED drive circuit, LED light device and electronic equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108702823A (en) |
| WO (1) | WO2018214105A1 (en) |
Cited By (1)
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| CN112714537A (en) * | 2020-12-30 | 2021-04-27 | 深圳市联影高端医疗装备创新研究院 | Lighting device and magnetic resonance system |
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| CN111987914A (en) * | 2020-08-03 | 2020-11-24 | 哈尔滨工程大学 | Isolated full-bridge converter |
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|---|---|
| WO2018214105A1 (en) | 2018-11-29 |
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