CN108702822A - A kind of LED drive circuit and LED light device - Google Patents
A kind of LED drive circuit and LED light device Download PDFInfo
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- CN108702822A CN108702822A CN201780008996.2A CN201780008996A CN108702822A CN 108702822 A CN108702822 A CN 108702822A CN 201780008996 A CN201780008996 A CN 201780008996A CN 108702822 A CN108702822 A CN 108702822A
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
A kind of LED drive circuit, including rectification circuit, filter circuit and power supply circuit, exchange input is converted into direct current input by the rectification circuit, the filter circuit is filtered to obtain Rectified alternating current to the direct current input of conversion, the power supply circuit includes switching device, energy storage device, constant-current device, switching control and protective device, the switching device side connects the filter circuit, the other side connects the energy storage device and the switching control, the switching control connects the protective device and couples the energy storage device, the energy storage device connects the constant-current device, the output of the constant-current device provides rated voltage for load device;The protective device, when the Rectified alternating current that the filter circuit is switched in the switching device is constant-current device charging, which is used for when the exchange inputs appearance input mutation, the insantaneous break switching device.
Description
Technical field
This application involves LED (light emitting diode) actuation techniques fields, and in particular to a kind of LED drive circuit, LED illumination
Device and electronic equipment.
Background technology
Currently, LED light device is because its high-effect, easily-controllable property, environmental protection radiationless are more and more widely used.
Power drives scheme is almost chip solution entirely in the LED light device in first stage, and there are of high cost and chips to hand over for chip solution
Pay the time it is unstable the problems such as.
Referring to FIG. 1, 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.As shown in Fig. 2, ACN of the input voltage from rectification circuit 11, the input of the both ends ACL carry out rectification using rectifier bridge DB1;It is whole
The filtered circuit of voltage after stream 12 is filtered to obtain the clean Rectified alternating current of comparison;Electricity is converted finally by DC
Road 13 obtains required voltage.
The drive circuit works of LED light device under high frequency mode, generate major electromagnetic interference.Please further refer to figure
2, existing LED light device circuit mostly uses greatly the scheme of governor circuit of the chip as driving circuit, such as Fig. 2 DC conversion electricity
The BP2831A chips that road 13 uses, because there is chip solution the operating mode of itself, the interference of generation to need to increase filtered electrical
Road could meet product certification interference requirement, even if the product interference for meeting certification interference requirement is not still small, be answered in specific LED
Remote controler remote control can not be supported with occasion.It needs to increase a large amount of interference filter component to further decrease interference,
Cause cost and small product size to increase, cannot be satisfied the demand of products application.
Improved LED light device has at low cost, long lifespan, electromagnetic interference (E l ectro using self-maintained circuit
Magnet i c I nterference, EM I) low, the advantages that no element delivery time is long, still, self-maintained circuit exists
It is seldom in LED light device.The most of no control circuits of existing self-maintained circuit are done using a triode
Circuit in order to control, and triode the shortcomings of there are temperature drift and slow reaction speeds, temperature drift leads to product room temperature and high temperature
Great changes will take place for output current and voltage under environment, and reaction speed cannot be turned off out quickly when product being caused to occur abnormal slowly
Guan Guan leads to damage of product, has the bad of significant proportion in production and client.Such circuit is prominent in input current or voltage
When change very big hidden danger is brought to product stability.
Therefore, the LED light device of the prior art needs to improve.
Invention content
The application mainly solving the technical problems that provide a kind of LED drive circuit safe and stable, electromagnetic interference is low,
LED light device and electronic equipment.
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
Exchange input is converted into direct current and inputted by power supply circuit, the rectification circuit, which filters the direct current input of conversion
Wave handles to obtain Rectified alternating current,
The power supply circuit includes switching device, energy storage device, constant-current device, switching control and protective device, is somebody's turn to do
Switching device side connects the filter circuit, and the other side connects the energy storage device and the switching control, switching control dress
It sets and connects the protective device and couple the energy storage device, which connects the constant-current device, the output of the constant-current device
Rated voltage is provided for load device;
The protective device should when the Rectified alternating current for switching to the filter circuit in switching device is constant-current device charging
Protective device is used for when the exchange inputs appearance input mutation, the insantaneous break switching device.
Wherein, when exchange input normally inputs, which incudes the electric energy magnetic energy variation of the energy storage device
And to the switching device feed-in feedback current, when instantaneous feedback current changing rate level off to zero when, switching device cut-off, when this
The instantaneous induced voltage change rate of energy storage device level off to zero when, switching means into conduction, wherein by this when the switching means into conduction
Rectified alternating current provides electric energy for constant-current device, and energy is provided by the energy storage device for constant-current device when which ends.
The protective device includes connection and controls the triode and operational amplifier of the switching device, the operational amplifier
Connect reference voltage circuit.
As an embodiment, which is zener diode and resistance.
As another embodiment, voltage chips and resistance on the basis of the reference voltage circuit.
The power supply circuit includes starter, which connects the starter, which includes ensureing to open
Close the start-up resistor of pipe lightly conducting.
Wherein, which is switching transistor, which includes the primary coil and diode of transformer, should
Constant-current device includes charging capacitor and the resistance in parallel with the charging capacitor;The switching control includes the secondary side of the transformer
Coil, capacitance and resistance.
Second aspect, the embodiment of the present application also provides a kind of LED light devices, including LED load device and LED to drive
Dynamic circuit, the LED drive circuit include rectification circuit, filter circuit and power supply circuit, which turns exchange input
Change direct current input into, which is filtered to obtain Rectified alternating current to the direct current input of conversion, the power supply circuit
Including switching device, energy storage device, constant-current device, switching control and protective device, switching device side connection should
Filter circuit, the other side connect the energy storage device and the switching control, which connects the protective device simultaneously
And the energy storage device is coupled, which connects the constant-current device, and the output of the constant-current device provides specified for load device
Voltage;The protective device, when the Rectified alternating current that the filter circuit is switched in switching device is constant-current device charging, the protection
Device is used for when the exchange inputs appearance input mutation, the insantaneous break switching device.
Wherein, when exchange input normally inputs, which incudes the electric energy magnetic energy variation of the energy storage device
And to the switching device feed-in feedback current, when instantaneous feedback current changing rate level off to zero when, switching device cut-off, when this
The instantaneous induced voltage change rate of energy storage device level off to zero when, switching means into conduction, wherein by this when the switching means into conduction
Rectified alternating current provides electric energy for constant-current device, and energy is provided by the energy storage device for constant-current device when which ends.
In the specific implementation, which includes connection and controls the triode and operation amplifier of the switching device
Device, the operational amplifier connect reference voltage circuit.
In one embodiment, which is zener diode and resistance.
In another embodiment, voltage chips and resistance on the basis of the reference voltage circuit.
The power supply circuit includes starter, which connects the starter, which includes ensureing to open
Close the start-up resistor of pipe lightly conducting.
In the specific implementation, the switching device be switching transistor, the energy storage device include transformer primary coil and
Diode, the constant-current device include charging capacitor and the resistance in parallel with the charging capacitor;The switching control includes the change
Secondary coil, capacitance and the resistance of depressor.
The third aspect, the embodiment of the present application also provides a kind of electronic equipment, wherein including:
At least one processor;And
Interactive unit, control mechanism and the LED such as preceding claims being connect at least one processor communication
Lighting device, wherein the instruction that the processor is inputted according to user in interactive unit, manipulate the control mechanism and unlatching or
Close the LED light device.
In the specific implementation, further include the memory and communication component being connect at least one processor communication.
The advantageous effect of the application is, LED drive circuit provided by the embodiments of the present application and LED light device,
Have good low interference effect when the low-voltage input of Rectified alternating current, Rectified alternating current high voltage or to lead normal high voltage defeated
It is fashionable and have good Immediate Protective Effects.
Its output end is the LED light source of load stabilization, will not generate job insecurity to the power circuit of LED light device
It influences, so output end will not have an impact the stabilized zone of product.But input terminal is connection generator, and there may be same power grids
Heavy-duty machines switch motion caused by voltage fluctuation, or lightning stroke caused by mutation voltage.When driving circuit is by being mutated
When high pressure, the protective device of setting can quickly compare the final control of amplification to subtle voltage and turn off the switching device, play protection
The effect of driving circuit.The protective device includes operational amplifier, and starting increase in mutation voltage instantaneously can be by the application's
Protective device rapidly switches off switching device, in addition operational amplifier itself has accurately comparison operation, can ensure LED product
Power it is consistent, and there is no the temperature height benchmark low with temperature to change for the operational amplifier of protective device, therefore will not
There are temperature drift problems.
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 is the structural schematic diagram of conventional LED light device;
Fig. 2 is the circuit diagram of existing LED illumination driving circuit;
Fig. 3 is the equivalent circuit diagram of the embodiment of the present application LED drive circuit;
Fig. 4 is the physical circuit figure of the embodiment of the present application LED drive circuit;
Fig. 5 is a kind of embodiment circuit diagram of the protective device of the embodiment of the present application LED drive circuit;
Fig. 6 is another embodiment circuit diagram of the protective device of the embodiment of the present application LED drive circuit;
Fig. 7 is the electronic devices structure block diagram that the embodiment of the present application includes LED light device;And
Fig. 8 is the electronic devices structure block diagram that another embodiment of the application includes LED light device.
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 LED drive circuit, LED light device and use the electronic equipment of the LED light device, this Shen
Protective device is arranged in LED drive circuit and LED light device please, which can be to protect circuit or as only
Vertical device is packaged into chip.The protective device amplifies voltage parameter or electricity in input mutation using operation amplifier circuit
Flow parameter so that small variation can be identified the operation protected circuit devcie and control LED drive circuit.Protection dress
Operational amplifier in setting is stablized with performance, Low Drift Temperature, the advantages that precisely comparison.
The Switching Power Supply of LED light device works under high frequency mode, and capacitor charge and discharge, the voltage of switching tube, electric current exist
Being switched fast when high-frequency work constitutes electromagnetic interference source.The basic reason that the Switching Power Supply generates electromagnetic interference is its work
Very high current changing rate (variation of electric current in the unit interval, d i/dt) and voltage change ratio are generated during making (when unit
The variation of interior voltage, dv/dt), the surge current and peak voltage accordingly generated forms interference source.The technical side of the application
Case, current changing rate and voltage change ratio almost level off to zero when, switching device is just switched off and on, and almost levels off to zero
D i/dt or dv/dt change rates make the driving circuit of the application reduce interference source to greatest extent, and electromagnetic interference has substantial degradation,
And it can guarantee that the wireless telecommunications of the electronic equipment using the LED light device are unaffected.
Referring to FIG. 3, the LED light device of the embodiment of the present application, including load device 104 and LED drive circuit.It should
LED drive circuit includes rectification circuit 101, filter circuit 102 and power supply circuit 103.The rectification circuit 101 inputs exchange
It is converted into direct current input, which is filtered to obtain Rectified alternating current to the direct current input of conversion.
The power supply circuit includes starter 1, switching device 6, energy storage device 2, constant-current device 3, switching control 4 with
And protective device 5.
The starter 1 is connected to filter circuit 102, switching device 6 connect the filter circuit 102, constant-current device 3 and
Switching control 4.The switching control 4 couples the energy storage device 2, which connects the constant-current device 3, the perseverance
The output of stream device 3 is that load device 104 provides rated voltage.In the embodiment of the present application, which is to be operated in saturation
Switching transistor (abbreviation switching tube) under conducting.
Please also refer to the physical circuit figure of the embodiment of the present application shown in Fig. 4.The starter 1 of the power supply circuit includes
Make the start-up resistor R2 of switching tube Q1 lightly conductings.The startup path of the starter includes resistance R2, resistance R4, switching tube Q1,
And resistance R1, it is formed and starts path.
The energy storage device 2 includes the primary coil and diode D1 of transformer T1.The constant-current device 3 includes charging capacitor C4
With resistance R6 in parallel.The switching control 4 includes secondary coil, capacitance C3, resistance R4 and the resistance of transformer T1
R1。
The switching device 6 connects protective device 5, which cuts off the switching device 6 when encountering input mutation.
The protective device 5 is used when it is constant-current device charging that switching device 6, which is switched to by the high voltage of the Rectified alternating current of filter circuit,
In when the exchange inputs appearance input mutation, insantaneous break switching device 6 avoids mutation voltage or electric current from driving LED
Circuit or LED light device damage.
As shown in figure 4, the protective device of the embodiment of the present application include connection and control the triode Qa of the switching device with
And operational amplifier A P.Operational amplifier A P connection reference voltage circuits.Operational amplifier A P can be quickly to subtle voltage
Compare amplification for judging whether to need to turn off switching device to protect entire circuit, plays the role of the entire circuit of protection.It should
Operational amplifier A P starts increased instantaneous can be completed in mutation voltage and judges and rapidly switch off switching tube by triode Qa
Q1.Operational amplifier A P has accurately comparison operation, can ensure that the power of LED product is consistent.And the operation amplifier
There is no the temperature height benchmark low with temperature to change by device AP, therefore does not have temperature drift problems.
Triode Qa, operational amplifier A P and the reference voltage circuit of the protective device can integrate to protect core
Piece, being inserted into driving circuit can play a protective role.
Please also refer to a kind of embodiment circuit diagram of the protective device of the embodiment of the present application shown in fig. 5.It is wherein different
Place is that the reference voltage circuit is zener diode ZD and resistance R3.
Please also refer to another embodiment circuit diagram of the protective device of the embodiment of the present application shown in fig. 6.Wherein not
Be with place, potential circuit on the basis of the reference voltage circuit, preferably can on the basis of voltage chips and resistance R3.
Switching device, energy storage device 2, the switching control 4 of the LED drive circuit are operated in quasi-resonance operating mode
In, the Rectified alternating current and energy storage device charge and discharge frequency match handled from filter circuit 2 is appropriate so that the capacitance C4 of constant-current device
Obtain continual and steady electric energy.
The electric energy magnetic energy variation of 4 resonance of the switching control energy storage device 2 and to switching device input feedback electric current,
When instantaneous feedback current changing rate d i/dt level off to zero when, the switching device cut-off, when the instantaneous induced electricity of the energy storage device
Buckling rate dv/dt level off to zero when, switching means into conduction;Wherein, it is perseverance by the Rectified alternating current when switching means into conduction
It flows device and electric energy is provided, energy is provided by the energy storage device for constant-current device when which ends.Therefore externally electromagnetism is dry
Disturb it is very low,
The principle for reducing electromagnetic interference is as follows:
The alternating voltage of input is converted into DC voltage by input voltage by rectification circuit 101, using rectification circuit
102 towering type filter circuit is filtered to obtain Voltage pulsating direct-current supply to the pulsating volage after rectification.The power supply circuit 103
The direct current output that Rectified alternating current is converted into needing.
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 switching control 4 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. 4, input voltage is from L, the both ends N input, after rectifier bridge BR1 rectifications, using C1, L1, C2 groups
At towering mode filter be filtered, for filtered Rectified alternating current by R2, R4, Q1, R1 carries out circuit start, is opened after startup
It closes pipe Q1 and is in lightly conducting state.Transformer T1 primary coils by C4 anodes to C4 cathode, then 7 to the 8 foot shapes that pass through transformer
At energy storage device 2.A 7 positive 8 negative voltages are incuded on transformer T1 primary coils, while can be in the switching control 4
1,2 feel of side vice-side winding answer a 1 positive 2 negative voltage.This voltage is formed just by capacitance C3 to switching tube Q1
Feedback, positive feedback can further ensure that switching tube Q1 saturation conductions.It is slowly increased with the voltage of C3 capacitances, feedback current is slow
It is slow to reduce, but current direction is constant, remains able to ensure that switching tube Q1 normallies, the energy of storage continue growing.When C3 electricity
When appearance voltage is full of, the feedback current of 4 feed-in switching tube Q1 of the switching control is zero at this time, and feedback current cannot maintain open
It closes pipe Q1 to continue to be connected and make switching tube Q1 cut-offs, here it is zero current cut-offs.Switching tube Q1 cut-offs are simultaneously as transformer
Electric current on T1 suddenly becomes zero, can be overturn according to the induced voltage on " Lenz's law " at this time transformer, just for 7 minus 8,
Since D1 reversely ends, it is at this time load supplying by the electric energy that capacitance C4 is stored, is carried to secondary i.e. load device by C4
For rated voltage, until capacitance C4 completions release energy.The voltage of 1,2 foot of transformer can also be overturn simultaneously, just for 1 minus 2,
Phase voltage overturns and switching tube Q1 is made further to end.
With the release of secondary energy, electric current reduces.When electric current is reduced to zero, the induction electric on transformer T1 at this time
Gesture can further be overturn, and switching tube Q1 is connected again.Here it is no-voltage conductings.Switching tube Q1 ends in zero current,
No-voltage is connected, and interference is all relatively low.Therefore in the present embodiment, the high frequency switching setting of Rectified alternating current d I/dt or
The change rate of dV/dt level off to zero when carry out, driving circuit generate electromagnetic interference be greatly diminished.
When the normal input of exchange input, the switching control 4 incude the electric energy magnetic energy variation of the energy storage device 2 and to
The switching device feed-in feedback current, when instantaneous feedback current changing rate level off to zero when, the switching device cut-off, when the energy storage
The instantaneous induced voltage change rate of device 2 level off to zero when, switching means into conduction, wherein by the arteries and veins when switching means into conduction
Dynamic direct current is that constant-current device 3 provides electric energy, and energy is provided by the energy storage device 2 for constant-current device 3 when which ends.
(input mutation can be abnormal sudden change voltage or abnormal sudden change electricity when input mutation occurs in exchange input
Stream), and in switching means into conduction, when being charged for constant-current device 3 by the Rectified alternating current of the filter circuit 102, protection dress
5 are set when the exchange inputs appearance input mutation, the insantaneous break switching device is to protect driving circuit and load 104.
Specific work process is described below:
As shown in Figure 3 and Figure 4, exchange input is by fuse RF1, after rectifier bridge BR1 rectifications, is formed by C1, L1, C2
Towering mode filter be filtered, by R2, R4, Q1, R1 forms start-up circuit and makes switching tube Q1 for filtered pulsating direct current
In lightly conducting state.After start-up circuit works, transformer T1 passes through blocking by positive feedback, the voltage of secondary coil induction
Capacitance C3 forms positive feedback to switching tube Q1.It is slowly increased with the voltage of C3 capacitances, feedback current slowly reduces.And it is stored in
Energy in transformer T1 slowly increases, according to energy theorem:P=1/2*L*I*I*F, the electric current on R1 can increase.
When it is that constant-current device 3 charges that switching device, which is switched to by the Rectified alternating current of filter circuit 102, blocking is electric at this time
The voltage for holding C3 is full of not yet, and the voltage formed on resistance R1 has reached the reference voltage of operational amplifier A P, is occurring
When input mutation, operational amplifier A P rapid amplification outputs after being compared resistance R1 input signals, using triode Qa
Control switching tube Q1 is rapidly switched off, to play the role of protecting driving circuit and load.The protective device 5 opens the feelings of protection
Condition includes input abnormal sudden change electric current and input abnormal sudden change voltage
When it is that constant-current device 3 charges that switching device, which switches to the energy storage device 2, protective device does not carry out switching device
Shutdown operation, driving circuit are still worked in a manner of low EMI.At this point, the voltage of capacitance C3 is full of, on resistance R1
The reference voltage of operational amplifier A P is also not achieved in the voltage of formation, when capacitance C3 voltages are full of, feedback current at this time
It is zero, switching tube Q1 cut-offs, here it is zero current cut-offs.After switching tube Q1 cut-offs, transformer T1 stores energy and is discharged to secondary
Energy makes switching tube Q1 further end because transformer T1 phase voltages are overturn.As secondary energy discharges, according to energy
Formula:W=(1/2) * L*i*i reduce with the release of energy, and electric current reduces, when electric current is reduced to zero, transformer T1 at this time
On electromotive force be zero.Transformer T1 voltage-phases are overturn at this time, and switching tube Q1 is connected again, are realized and are connected in no-voltage.It opens
It closes pipe Q1 in zero current to end, be connected in no-voltage, the electromagnetic interference of generation is all relatively low.
Technical scheme LED drive circuit has low interference effect well in the low-voltage input of Rectified alternating current
Fruit has good Immediate Protective Effects again in high voltage or the abnormally high-voltage input of Rectified alternating current.
Referring to FIG. 7, the existing electronic equipment with LED light device, system construction is more and more numerous and more jumbled, in addition to control
The control mechanism of itself, it is also necessary to can be with system communication and by the management and running of system.In LED light device provided by the present application
LED drive circuit be operated in quasi-resonance safe mode, electromagnetic interference reduces to minimum, do not influence electronic equipment remote control and
It wirelessly communicates and not by input mutation disturbance, safety and stability.
The embodiment of the present application is further to associated electronic device, wherein extremely including at least one processor and with this
Interactive unit, control mechanism and the LED light device as the aforementioned of few processor communication connection, wherein the processor
According to the instruction that user inputs in interactive unit, manipulates the control mechanism and be turned on or off the LED light device.
Be illustrated in figure 7 this application involves electronic equipment 600.600 embodiment of electronic equipment can be door lifter,
It can be any single-chip computer control system using the LED light device 650.
The electronic equipment 600 includes at least one processor 610, the people at least one processor 610 communication connection
Machine interactive unit 630, control mechanism 660 and LED light device 650.Drive control of the control mechanism in the processor 610
It is lower to complete preset function, such as the motor of door lifter and transmission mechanism etc..
Wherein, which is sent to the instruction of man-machine interaction unit 630 according to user, manipulates control mechanism fortune
It is needed according to product design to be turned on or off the LED light device 650 while work.
The structure of the LED light device 650 with design as aforementioned LED light device, including starter 1, energy storage
Device 2, constant-current device 3, switching control 4, protective device 5 and switching device 6, electromagnetic interference is low when circuit is run, electricity
Road is not influenced by input mutation, high safety and reliability.
As shown in figure 8, in other embodiments, which can establish system with other related equipment group-net communication,
Therefore the electronic device further includes the memory 620 communicated to connect at least one processor 610 and communication component 640.
The technical solution of the application provides reliable and stable protective device, which forms with operational amplifier
Control protection electric circuit, the performance because taking full advantage of operational amplifier are stablized, Low Drift Temperature, the advantages that precisely comparison.
LED drive circuit provided by the embodiments of the present application and LED light device, output end are the LED of load stabilization
Light source, will not generate job insecurity to the power circuit of LED light device influences, so output end will not be to the stabilization of product
Band has an impact.But input terminal is connection generator, voltage wave caused by the heavy-duty machines switch motion there may be same power grid
It is dynamic, or mutation voltage caused by lightning stroke.When driving circuit is by the high pressure being mutated, the protective device of setting is to subtle voltage
The final control of amplification can quickly be compared and turn off the switching device, play the role of protecting driving circuit.The protective device includes fortune
Amplifier is calculated, start to increase in mutation voltage instantaneously can rapidly switch off switching device by the protective device of the application, in addition fortune
Calculating amplifier itself has accurately comparison operation, can ensure that the power of LED product is consistent, and the operation of protective device is put
There is no the temperature height benchmark low with temperature to change for big device, therefore does not have temperature drift problems.
Also, switching control is arranged in LED drive circuit provided by the embodiments of the present application and LED light device, when
The instantaneous feedback current changing rate of switching control level off to zero when, switching device cut-off is instantaneous when the energy storage device
Induced voltage change rate level off to zero when, switching means into conduction so that curent change of the circuit of high-frequency work in switching instant
Rate d i/dt and voltage change ratio dv/dt are minimum, to fundamentally reduce electromagnetic interference source, greatly reduce the electricity of circuit
Magnetic disturbance, and to use the wireless telecommunications of the corresponding electronic equipment of this kind of New LED driving circuit unaffected;The application
The LED light device of offer can be applied in the products application occasion for having low interference demand.
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 (16)
1. a kind of LED drive circuit, including rectification circuit, filter circuit and power supply circuit, the rectification circuit will exchange defeated
Enter to be converted into direct current input, the filter circuit is filtered to obtain Rectified alternating current to the direct current input of conversion, special
Sign is,
The power supply circuit includes switching device, energy storage device, constant-current device, switching control and protective device, described
Switching device side connects the filter circuit, and the other side connects the energy storage device and the switching control, described to cut
Control device is changed to connect the protective device and couple the energy storage device, the energy storage device connects the constant-current device,
The output of the constant-current device provides rated voltage for load device;
The protective device switches to the Rectified alternating current of the filter circuit in the switching device and charges for constant-current device
When, the protective device is used for when the exchange inputs appearance input mutation, switching device described in insantaneous break.
2. LED drive circuit according to claim 1, which is characterized in that described to cut when the exchange input normally inputs
It changes control device and incudes the electric energy magnetic energy variation of the energy storage device and to the switching device feed-in feedback current, when instantaneous anti-
Supply current change rate level off to zero when, switching device cut-off, when the instantaneous induced voltage change rate of the energy storage device becomes
When being bordering on zero, switching means into conduction, wherein carried for the constant-current device by the Rectified alternating current when switching means into conduction
For electric energy, energy is provided for the constant-current device when switching device ends by the energy storage device.
3. LED drive circuit according to claim 2, which is characterized in that the protective device includes connecting and controlling institute
The triode and operational amplifier of switching device are stated, the operational amplifier connects reference voltage circuit.
4. LED drive circuit according to claim 3, which is characterized in that the reference voltage circuit is zener diode
And resistance.
5. LED drive circuit according to claim 3, which is characterized in that voltage core on the basis of the reference voltage circuit
Piece and resistance.
6. according to claim 1-5 any one of them LED drive circuits, which is characterized in that the power supply circuit further includes opening
Dynamic device, the switching device connect the starter, and the starter includes ensureing the startup of switching device lightly conducting
Resistance.
7. LED drive circuit according to claim 6, which is characterized in that the switching device is switching transistor, described
Energy storage device includes the primary coil and diode of transformer, the constant-current device include charging capacitor and with the charging capacitor
Resistance in parallel;The switching control includes the secondary coil, capacitance and resistance of the transformer.
8. a kind of LED light device, including LED load device and LED drive circuit, the LED drive circuit include rectification
Exchange input is converted into direct current and inputted by circuit, filter circuit and power supply circuit, the rectification circuit, the filter circuit pair
The direct current input of conversion is filtered to obtain Rectified alternating current, which is characterized in that
The power supply circuit includes switching device, energy storage device, constant-current device, switching control and protective device, described
Switching device side connects the filter circuit, and the other side connects the energy storage device and the switching control, described to cut
Control device is changed to connect the protective device and couple the energy storage device, the energy storage device connects the constant-current device,
The output of the constant-current device provides rated voltage for load device;
The protective device switches to the Rectified alternating current of the filter circuit in the switching device and charges for constant-current device
When, the protective device is used for when the exchange inputs appearance input mutation, switching device described in insantaneous break.
9. LED light device according to claim 8, which is characterized in that described to cut when the exchange input normally inputs
It changes control device and incudes the electric energy magnetic energy variation of the energy storage device and to the switching device feed-in feedback current, when instantaneous anti-
Supply current change rate level off to zero when, switching device cut-off, when the instantaneous induced voltage change rate of the energy storage device becomes
When being bordering on zero, switching means into conduction, wherein carried for the constant-current device by the Rectified alternating current when switching means into conduction
For electric energy, energy is provided for the constant-current device when switching device ends by the energy storage device.
10. LED light device according to claim 9, which is characterized in that the protective device includes connecting and controlling institute
The triode and operational amplifier of switching device are stated, the operational amplifier connects reference voltage circuit.
11. LED light device according to claim 10, which is characterized in that the reference voltage circuit is two pole of voltage stabilizing
Pipe and resistance.
12. LED light device according to claim 10, which is characterized in that voltage on the basis of the reference voltage circuit
Chip and resistance.
13. according to claim 8-12 any one of them LED light devices, which is characterized in that the power supply circuit further includes
Starter, the switching device connect the starter, and the starter includes ensureing the startup of switching tube lightly conducting
Resistance.
14. LED light device according to claim 13, which is characterized in that the switching device is switching transistor, institute
State the primary coil and diode that energy storage device includes transformer, the constant-current device include charging capacitor and with charging electricity
Hold resistance in parallel;The switching control includes the secondary coil, capacitance and resistance of the transformer.
15. a kind of electronic equipment, which is characterized in that including:
At least one processor;And
Man-machine interaction unit, control mechanism and such as claim 8-14 being connect at least one processor communication are any
LED light device described in, wherein the instruction that the processor is inputted according to user in interactive unit manipulates the control
Mechanism and it is turned on or off the LED light device.
16. electronic equipment according to claim 15, which is characterized in that further include and at least one processor communication
The memory and communication component of connection.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/085957 WO2018214104A1 (en) | 2017-05-25 | 2017-05-25 | Led driving circuit and led lighting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108702822A true CN108702822A (en) | 2018-10-23 |
Family
ID=63844114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780008996.2A Pending CN108702822A (en) | 2017-05-25 | 2017-05-25 | A kind of LED drive circuit and LED light device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108702822A (en) |
| WO (1) | WO2018214104A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656467A (en) * | 2008-08-18 | 2010-02-24 | 海尔集团公司 | Power factor correcting circuit of part of active power supplies |
| CN202652062U (en) * | 2012-07-11 | 2013-01-02 | 青岛海信电器股份有限公司 | PFC circuit and PFC transformer |
| CN104394618A (en) * | 2014-11-14 | 2015-03-04 | 涂小兵 | LED light-emitting device having multiple lighting functions and control method of LED light-emitting device |
| CN205546049U (en) * | 2016-01-29 | 2016-08-31 | 深圳和而泰照明科技有限公司 | Power supply circuit and LED lighting device |
| CN206181501U (en) * | 2016-11-25 | 2017-05-17 | 黄晓允 | Self -powered light operator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105682287A (en) * | 2016-01-29 | 2016-06-15 | 深圳和而泰照明科技有限公司 | Power supply circuit applied to fixed load and LED illuminating apparatus |
| CN106301013A (en) * | 2016-09-21 | 2017-01-04 | 深圳和而泰照明科技有限公司 | A kind of door lifter circuit and door lifter |
-
2017
- 2017-05-25 CN CN201780008996.2A patent/CN108702822A/en active Pending
- 2017-05-25 WO PCT/CN2017/085957 patent/WO2018214104A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101656467A (en) * | 2008-08-18 | 2010-02-24 | 海尔集团公司 | Power factor correcting circuit of part of active power supplies |
| CN202652062U (en) * | 2012-07-11 | 2013-01-02 | 青岛海信电器股份有限公司 | PFC circuit and PFC transformer |
| CN104394618A (en) * | 2014-11-14 | 2015-03-04 | 涂小兵 | LED light-emitting device having multiple lighting functions and control method of LED light-emitting device |
| CN205546049U (en) * | 2016-01-29 | 2016-08-31 | 深圳和而泰照明科技有限公司 | Power supply circuit and LED lighting device |
| CN206181501U (en) * | 2016-11-25 | 2017-05-17 | 黄晓允 | Self -powered light operator |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018214104A1 (en) | 2018-11-29 |
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Application publication date: 20181023 |