CN106102253A - Led drive circuit and led lamp tube - Google Patents
Led drive circuit and led lamp tube Download PDFInfo
- Publication number
- CN106102253A CN106102253A CN201610626520.2A CN201610626520A CN106102253A CN 106102253 A CN106102253 A CN 106102253A CN 201610626520 A CN201610626520 A CN 201610626520A CN 106102253 A CN106102253 A CN 106102253A
- Authority
- CN
- China
- Prior art keywords
- led
- circuit
- led drive
- drive circuit
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a kind of LED drive circuit and LED lamp tube, above-mentioned LED drive circuit includes: feedback control circuit, load impedance increase circuit, wherein, described feedback control circuit gathers the operating current of LED, and compare with predetermined threshold value, when the operating current of described LED is more than or equal to described threshold value, drive described load impedance to increase circuit work, when the operating current of described LED is less than described threshold value, described load impedance increases circuit and does not works；When described load impedance increases circuit work, increase the load equivalent impedance of described LED drive circuit.The technical scheme that the present invention provides can reduce output power of electronic ballast, within making LED lamp tube be operated in design power, it is ensured that the normal of LED lamp tube uses and life of product.
Description
Technical field
The present invention relates to lighting technical field, particularly relate to a kind of LED drive circuit and LED lamp tube.
Background technology
The specular removal of LED, long-life and the most mercurous feature so that use LED lamp tube to substitute conventional fluorescent fluorescent tube
It is increasingly becoming a kind of trend.Alternate application has two kinds of main modes, and one is to remove original fluorescent lamp tube and town completely
Stream device, directly inputs civil power to LED lamp tube, but this mode needs amendment lamp interior wiring, therefore produces extra people
Expenses of labour is used；Another is only to replace fluorescent tube, and the LED lamp tube of installation needs the work of compatible original ballast, and this replacement is non-
The most simple and convenient, therefore user can save the labour cost of decorrelation oneself to operate without engagement professional.
In fluorescent lamp ballast, electric ballast has sizable ratio, thus substitutes the one of fluorescent lamp tube and choose greatly
War is that compatible electronic ballast works.Electric ballast has different topological structure, and due to the LED lamp tube merit used
Rate is often far below fluorescent lamp tube power, and this makes electric ballast collocation LED lamp tube work have many difficulties, at present than
The LED drive circuit framework of relatively main flow is as shown in Figure 1.
In FIG, AC is civil power input, and after electric ballast, output high-frequency ac voltage and alternating current are to LED
Fluorescent tube, inside LED lamp tube, filament analog circuit is used for simulating conventional fluorescent filament impedances, and rectifier bridge is for handing over high frequency
Stream voltage and alternating current are converted to DC voltage and DC current, then are converted into suitable voltage electricity through power conversion electric current
The bright LED particle of flow point.
Fig. 2 is the electrical block diagram of existing LED drive circuit, its breaker in middle S1, switch S2, partiting dc capacitor Cb,
Resonant inductance Lr and resonant capacitance Cr belongs to electric ballast internal circuit, and switch S1 and S2 forms half-bridge circuit, and high frequency becomes
Change high voltage bus voltage；Partiting dc capacitor Cb removes the direct current component of high frequency voltage, is converted to ac high-frequency voltage signal；Resonance
Inductance Lr and resonant capacitance Cr forms resonator cavity, and for the resonance lighting when connecing fluorescent lamp, resonant inductance Lr is after steady operation
Play metering function.LED lamp tube is connected to electric ballast by terminal 1,2,3 and 4, enter after filament analog circuit by
The rectifier bridge of diode D1, D2, D3 and D4 composition, the high frequency ac signal from ballast is converted into direct current letter through rectifier bridge
Number, export LED light source through power conversion circuit.
Existing LED lamp tube when connecting the electric ballast of constant-power electronic ballast or magnet ring self-excited driving, by
The power of output corresponding fluorescent lamp use, this often much bigger than LED lamp tube power, too high merit is kept in electric ballast
Rate can make LED lamp tube trigger protection, overheated or die of old age too early, affects the use of LED lamp tube, if fluorescent tube provides corresponding interior
Putting protection, then can make LED lamp tube incompatible the type electric ballast, this also can affect the sale of product.
Summary of the invention
In view of the above problems, it is proposed that the invention provides a kind of LED drive circuit and LED lamp tube to overcome the problems referred to above
Or solve the problems referred to above at least in part.
According to an aspect of the invention, it is provided a kind of LED drive circuit, including: feedback control circuit, load impedance
Increasing circuit, wherein, described feedback control circuit gathers the operating current of LED, and compares with predetermined threshold value, when described
When the operating current of LED is more than or equal to described threshold value, described load impedance is driven to increase circuit work, when the work of described LED
When electric current is less than described threshold value, described load impedance increases circuit and does not works；When described load impedance increases circuit work, increase
The load equivalent impedance of described LED drive circuit.
Optionally, above-mentioned LED drive circuit also includes: rectifier bridge, and described load impedance increases circuit and is arranged on described whole
Between stream bridge and described LED.
Optionally, described load impedance increase circuit includes: load impedance increases element and increases with described load impedance
The switch element of element in parallel, during described switching elements conductive, described load impedance increases element and is bypassed, described switch element
During disconnection, described load impedance increases element and accesses described LED drive circuit, increases the load equivalent of described LED drive circuit
Impedance.
Optionally, described switch element includes: pliotron, field effect transistor or relay.
Optionally, described threshold value is threshold voltage；Described feedback control circuit includes: current detecting unit, threshold ratio are relatively
Unit, driver element, the operating current of the described current detecting unit described LED of collection is converted into and compares voltage, and inputs
To described threshold value comparing unit, the described voltage that compares is compared with described threshold voltage, works as institute by described threshold value comparing unit
State compare voltage more than or equal to described threshold voltage time, control described driver element and start working to drive described load impedance to increase
Add circuit work, when described compare voltage less than described threshold voltage time, described driver element does not works, described load impedance increase
Add circuit not work.
Optionally, described current detecting unit includes: sampling resistor, transformator or Hall element.
Optionally, described current detecting unit includes: sampling resistor, and described sampling resistor joins with described LED strip, described
The operating current of LED flows through described sampling resistor and produces and described compare voltage.
Optionally, described threshold value comparing unit includes: comparator, and described sampling resistor is just being connected to described comparator
End, described threshold voltage accesses the negative terminal of described comparator, and the outfan of described comparator is connected to described driver element, described
The outfan of comparator is additionally coupled to the anode of described comparator.
Optionally, described threshold value comparing unit also includes: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, institute
Stating sampling resistor and be connected to the anode of described comparator by described first resistance, described threshold voltage passes through described second resistance
Accessing the negative terminal of described comparator, the outfan of described comparator is just being connected to described comparator by described 3rd resistance
End, the outfan of described comparator is connected to described driver element by described 4th resistance.
Optionally, described driver element includes: switch triode, current-limiting resistance, fly-wheel diode, described switch triode
Base stage be connected to the outfan of described threshold value comparing unit, the grounded emitter of described switch triode, described switch three pole
The colelctor electrode of pipe is connected to described fly-wheel diode by described current-limiting resistance, and described fly-wheel diode increases with described load impedance
Add the switch element reverse parallel connection of circuit.
Optionally, above-mentioned LED drive circuit also includes: power conversion circuit；It is impedance that described load impedance increases element
Inductance, described switch element is relay, and described relay includes: drive winding and relay switch, the one of described driving winding
End is connected to the colelctor electrode of described switch triode by described current-limiting resistance, and the other end of described driving winding is connected to electricity
Source, described driving winding and described fly-wheel diode reverse parallel connection, described relay switch and described impedance inductance in parallel, described resistance
Anti-inductance two ends connect respectively at described rectifier bridge and described power conversion circuit.
Optionally, above-mentioned LED drive circuit also includes: power conversion circuit；Described driver element includes: optical coupling module,
First divider resistance, the second divider resistance, Zener diode, it is more single that the input of described optical coupling module is connected to described threshold ratio
The outfan of unit, the outfan of described optical coupling module is connected to described load impedance increases circuit, and the bus of described rectifier bridge leads to
Cross described first divider resistance and described second divider resistance is connected to described load impedance and increases the switch element of circuit, described
Two ends with described switch element respectively, the two ends of Zener diode are connected.
Optionally, it is impedance inductance that described load impedance increases element, and described switch element is field effect transistor, described rectification
The bus of bridge is connected to the gate pole of described field effect transistor, described field by described first divider resistance and described second divider resistance
The gate pole of effect pipe is connected simultaneously to the outfan of described optical coupling module, and the gate pole of described field effect transistor and source electrode are respectively with described
The two ends of Zener diode connect, and the two ends of described impedance inductance are connected with source electrode and the drain electrode of described field effect transistor respectively, institute
State one end that impedance inductance is connected with the source electrode of described field effect transistor to be connected with described rectifier bridge, described impedance inductance and institute simultaneously
The one end of the drain electrode connection stating field effect transistor is connected with described power conversion circuit simultaneously.
According to another aspect of the present invention, additionally provide a kind of LED lamp tube, including any of the above-described LED drive circuit and
At least one LED being connected with LED drive circuit, LED drive circuit is for driving at least one LED luminescence work after the power-up
Make.
The LED drive circuit that the embodiment of the present invention provides, is suitable for the LED lamp tube application of compatible electronic ballast, particularly
For invariable power ballast or magnet ring self-excited driving ballast, ballast output power can be reduced so that LED lamp tube can work
At rated power, it is to avoid cause LED lamp tube to be damaged or senilism because overpower uses.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of description, and in order to allow above and other objects of the present invention, the feature and advantage can
Become apparent, below especially exemplified by the detailed description of the invention of the present invention.
According to below in conjunction with the accompanying drawing detailed description to the specific embodiment of the invention, those skilled in the art will be brighter
Above-mentioned and other purposes, advantage and the feature of the present invention.
Accompanying drawing explanation
By reading the detailed description of hereafter preferred implementation, various other advantage and benefit common for this area
Technical staff will be clear from understanding.Accompanying drawing is only used for illustrating the purpose of preferred implementation, and is not considered as the present invention
Restriction.And in whole accompanying drawing, it is denoted by the same reference numerals identical parts.In the accompanying drawings:
Fig. 1 is the configuration diagram of existing LED drive circuit；
Fig. 2 is the electrical block diagram of existing LED drive circuit；
Fig. 3 is the configuration diagram of LED drive circuit according to embodiments of the present invention；
Fig. 4 is the configuration diagram of LED drive circuit according to the preferred embodiment of the invention；
Fig. 5 is the electrical block diagram of LED drive circuit in accordance with a preferred embodiment of the present invention；
Fig. 6 is the electrical block diagram of the LED drive circuit according to another preferred embodiment of the present invention.
Detailed description of the invention
It is more fully described the exemplary embodiment of the disclosure below with reference to accompanying drawings.Although accompanying drawing shows the disclosure
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure and should be by embodiments set forth here
Limited.On the contrary, it is provided that these embodiments are able to be best understood from the disclosure, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.It should be noted that the technology in the embodiment of the present invention and preferred embodiment is special
Levy and can be combined with each other on the premise of not conflicting.
For problem in prior art, it is necessary to design a LED drive circuit so that it is connecting constant-power electronic town
When flowing the electric ballast of device or magnet ring self-excited driving, output power of electronic ballast can be reduced, make LED lamp tube be operated in and set
Within meter power, it is ensured that the normal of LED lamp tube uses and life of product.
Fig. 3 is LED drive circuit configuration diagram according to embodiments of the present invention.The LED that the embodiment of the present invention provides drives
Galvanic electricity road can directly with the module cooperating of existing LED drive circuit.As it is shown on figure 3, according to embodiments of the present invention
LED drive circuit includes that feedback control circuit 13 and load impedance increase circuit 14, its can directly and filament analog circuit 10,
Rectifier bridge 11, power conversion circuit 12 cooperating, whole LED drive circuit is for driving at least one LED to send out after the power-up
Light works, and Fig. 3 illustrate only a LED.Preferably, load impedance increases circuit 14 and can be arranged on rectifier bridge 11 and above-mentioned
Between LED.
In the present embodiment, feedback control circuit 13 gathers the operating current of LED, and compares with predetermined threshold value,
When the operating current of LED is more than or equal to threshold value, drives load impedance to increase circuit 14 and work, when the operating current of LED is less than
During threshold value, load impedance increases circuit 14 and does not works；
When load impedance increase circuit 14 works, increase the load equivalent impedance of LED drive device.
The LED drive circuit that the present embodiment provides, can improve the negative of whole LED drive circuit when LED power is too high
Carry equiva lent impedance, so that electric ballast reduces output electric current, reduce the purpose of output.The present embodiment provides
LED drive circuit is suitable for the LED lamp tube application of compatible electronic ballast, especially for invariable power ballast or magnet ring self-excitation
Drive ballast, ballast output power can be reduced so that LED lamp tube can be operated in rated power, it is to avoid because overpower makes
Damage or senilism with causing LED lamp tube.
In a preferred embodiment of the invention, feedback control circuit 13 can be realized by following framework.Such as Fig. 4
Shown in, feedback control circuit 13 may include that current detecting unit 131, threshold value comparing unit 132, driver element 133, electric current
Detector unit 131 gathers the operating current of LED and is converted into and compares voltage, and inputs to threshold value comparing unit 132, threshold ratio
Relatively unit 132 compares comparing voltage with threshold voltage, when comparing voltage more than or equal to threshold voltage, controls to drive list
Unit 133 starts working to drive load impedance to increase circuit 14 and works, when comparing voltage less than threshold voltage, and driver element
133 do not work, and load impedance increases circuit 14 and do not works.
This preferred embodiment provides a kind of scheme preferably implementing feedback control circuit 13, based on current detecting unit
131, threshold value comparing unit 132, driver element 133 i.e. can be completely achieved the function of feedback control circuit 13, and framework is succinct and control
Logic processed is clear and definite.In the scheme that this preferred embodiment provides, have employed and convert electrical current into the mode that voltage compares, this
Sample can significantly simplify circuit structure, lower cost.Now, above-mentioned threshold value is voltage threshold.
In the above-described embodiments, current detecting unit 131 can be directly based upon sampling resistor, transformator or hall sensing
Device realizes, and i.e. uses sampling resistor, transformator, Hall element can realize gathering the function of electric current.
Further, as shown in Figure 4, load impedance increase circuit 14 can by load impedance increase element 141 and with
Load impedance increases the switch element 142 of element 141 parallel connection and realizes, and when switch element 142 turns on, load impedance increases element
141 are bypassed, and the load equivalent impedance of LED drive circuit is not changed in；When switch element 142 disconnects, load impedance increases unit
Part 141 accesses LED drive circuit, increases the load equivalent impedance of LED drive circuit.
As shown in Figure 4, load impedance increases circuit 14 and can be arranged between rectifier bridge 11 and power conversion circuit 12, negative
Carry impedance increase element 141 to be realized by the inductance connected with rectifier bridge 11 and power conversion circuit 12, switch element 142
Then can pass through pliotron, field effect transistor or relay etc. to realize.Switch element 142 is controlled by LED current,
LED loop seals in current detecting unit 131, by threshold ratio relatively, comparative result is input to driver element 133, single by driving
Unit 133 controls conducting and the disconnection of switch element 142.Current detecting unit 131 can feed back the size of current of LED, this electric current
Comparing with the threshold value set, if the threshold value that the current ratio flowing through LED sets is little, driver element 133 makes switch element 142
Conducting, load impedance increases element 141 and is shorted, and duty is constant；The threshold value set when the current ratio flowing through LED is big, drives
Moving cell 133 makes switch K disconnect, and load impedance increases element 141 and is linked between rectifier bridge 11 and power conversion circuit 12,
Increase the load equivalent impedance of LED drive circuit.Implement compare LED operation electric current and predetermined threshold size time, can
So that electric current dress is changed to voltage compares, the most predetermined threshold value threshold voltage to be set to.Alternatively, it is also possible to be considered as
Directly by divider resistance equal proportion sampling voltage, then the mode compared with threshold voltage.
Load impedance is increased element 141 and can be realized by inductance, and be because electric ballast output is high frequency voltage
And high frequency electric, inductance presents certain resistance value under high frequency electric, and when inductance access circuit, this resistance value is with follow-up
Power conversion circuit forms the relation of series connection, such that it is able to improve load equivalent impedance, makes electric ballast reduce output electric current,
Reduce the purpose of output.Meanwhile, inductance is connected with subsequent power translation circuit, it is also possible to change load impedance special
Property, for the electric ballast using similar electric charge pump mode to realize PPFC, input current can be reduced total
Harmonic distortion.
Based on foregoing circuit framework, when implementing, circuit structure as shown in Figure 5 can be set up.
As it is shown in figure 5, rectifier bridge 11 is made up of diode D1, D2, D3 and D4, load impedance increases circuit 14 and is arranged on whole
Between stream bridge 11 and power conversion circuit 12, it includes inductance L, relay K 1, and relay K 1 is in the case of not excitation
Normally closed.Current detecting unit 131 is realized by sampling resistor Rs, and current sampling resistor Rs seals in LED loop, LED electricity
Stream flows through sampling resistor Rs and produces corresponding voltage, i.e. compares voltage.Threshold value comparing unit 132 realizes based on comparator U1, separately
Outward, for the consideration of current limliting, the first resistance R1, the second resistance R2, the 3rd resistance Rfb, the 4th resistance Rd can be set up, the most electric
Pressure feeds back to the anode of comparator U1 through the first resistance R1, and threshold voltage Vref accesses comparator U1's through the second resistance R2
Negative terminal；On the one hand comparator U1 outfan feeds back to anode by the 3rd resistance Rfb, is on the other hand driven by the 4th resistance Rd
The switch triode Q1 that driver element 133 includes.The colelctor electrode of switch triode Q1 is connected to relay by current-limiting resistance R3
K1 drives winding current-limiting resistance, and R3 flows through relay K 1 for restriction and drives the electric current of winding, drives other one of winding to connect electricity
Source Vcc, simultaneously drive winding reverse parallel connection sustained diode r, drives winding when switch triode Q1 turns off for providing
Continuous current circuit.
Owing to relay K 1 is normally closed conjunction when not encouraging, after circuit powers on, relay K1 remains closed, and inductance L is short
Road, normal circuit operation, now there is electric current to flow into LED, and detected by sampling resistor Rs.If the current ratio flowing into LED sets
Fixed threshold value is little, and the negative terminal of comparator U1 is bigger than anode, and comparator U1 output low level, switch triode Q1 is held off, and continues
The driving winding of electrical equipment K does not has exciting current to flow through, and relay K 1 remains closed；If the threshold that the current ratio flowing into LED sets
Value is big, and the negative terminal of comparator U1 is less than anode, and comparator U1 exports high level, and switch triode Q1 turns on, and power Vcc provides electricity
Stream flows into relay K 1 and drives winding so that relay K 1 disconnects, and inductance L accesses circuit, thus reduces electric ballast output
Power, reduces the electric current flowing into LED.
3rd resistance Rfb is used for positive feedback, when comparator U1 exports high level, is just fed back to by the 3rd resistance Rfb
End input, even if causing the comparison voltage through sampling resistor Rs feedback to reduce, due to the 3rd resistance owing to LED current reduces
The feedback of Rfb so that the anode of comparator U1 is bigger than negative terminal, comparator U1 keeps high level output.
Further, based on foregoing circuit framework, when implementing, it is also possible to set up circuit structure as shown in Figure 6.
In the circuit shown in Fig. 6, current detecting unit 131 and threshold value comparing unit 132 with in the circuit shown in Fig. 5
Current detecting unit 131 is identical with threshold value comparing unit 132 structure.Load impedance increases circuit 14 and includes inductance L and field effect
Pipe K2, inductance L two ends parallel field effect pipe K2, the gate-drive of field effect transistor K2 is from the bus of rectifier bridge 11, through first
Divider resistance RA and the second divider resistance RB dividing potential drop access, and the gate pole of scene effect pipe K2 and source electrode access Zener diode Dz and use
In limiting driving voltage.LED current detects and feeds back to the anode of comparator U1, threshold voltage Vref warp by sampling resistor Rs
Crossing the second resistance R2 and access the negative terminal of comparator U1, on the one hand the outfan of U1 feeds back to anode by the 3rd resistance Rfb and inputs,
On the other hand accessing optical coupling module U2, optical coupling module U2 by the 4th resistance Rd and be used for providing driving cut-off signals, controlling filed is imitated
Should pipe K2 on or off.
When circuit powers on, the busbar voltage of rectifier bridge is provided by the first divider resistance RA and the second divider resistance RB and drives
Biasing is to field effect transistor K2 so that field effect transistor K2 saturation conduction, when the electric current flowing into LED is little, through sampling resistor Rs
The comparison voltage ratio voltage threshold Vref of feedback is little, and comparator U1 output low level does not drive a current through optical coupling module U2,
Optical coupling module U2 is held off, and switch K remains closed conducting, thus by-pass inductor L, do not affect original work；When electronics town
When stream device output is excessive, the electric current flowing into LED becomes big, exceedes the threshold value of setting, and the anode of comparator U1 is bigger than negative terminal, than
Relatively device U1 output high level drives optical coupling module U2, and the conducting of optical coupling module U2 makes field effect transistor K2 gate voltage drag down, field
Effect pipe K2 disconnects, and inductance L is sealed in circuit, thus reduces output power of electronic ballast.
Additionally provide a kind of LED lamp tube in one embodiment of the invention, it include any of the above-described LED drive circuit and
At least one LED being connected with LED drive circuit, LED drive circuit is for driving at least one LED above-mentioned luminous after the power-up
Work.
Embodiments provide a kind of LED drive circuit, be suitable for the LED lamp tube application of compatible electronic ballast, special
It not that this drive circuit can reduce ballast output power, make for invariable power ballast or magnet ring self-excited driving ballast
Obtain LED lamp tube and can be operated in rated power, it is to avoid cause LED to damage or senilism because overpower uses, meanwhile, to using nothing
The electric ballast of active power factor correction, this driving can improve Harmonics of Input distortion further.
In description mentioned herein, illustrate a large amount of detail.It is to be appreciated, however, that the enforcement of the present invention
Example can be put into practice in the case of not having these details.In some instances, it is not shown specifically known method, structure
And technology, in order to do not obscure the understanding of this description.
Similarly, it will be appreciated that one or more in order to simplify that the disclosure helping understands in each inventive aspect, exist
Above in the description of the exemplary embodiment of the present invention, each feature of the present invention is grouped together into single enforcement sometimes
In example, figure or descriptions thereof.But, the method for the disclosure should not be construed to reflect an intention that i.e. required guarantor
The application claims feature more more than the feature being expressly recited in each claim protected.More precisely, as following
Claims reflected as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
The claims following detailed description of the invention are thus expressly incorporated in this detailed description of the invention, the most each claim itself
All as the independent embodiment of the present invention.
Those skilled in the art are appreciated that and can carry out the module in the equipment in embodiment adaptively
Change and they are arranged in one or more equipment different from this embodiment.Can be the module in embodiment or list
Unit or assembly are combined into a module or unit or assembly, and can put them in addition multiple submodule or subelement or
Sub-component.In addition at least some in such feature and/or process or unit excludes each other, can use any
Combine all features disclosed in this specification (including adjoint claim, summary and accompanying drawing) and so disclosed appoint
Where method or all processes of equipment or unit are combined.Unless expressly stated otherwise, this specification (includes adjoint power
Profit requires, summary and accompanying drawing) disclosed in each feature can be carried out generation by providing identical, equivalent or the alternative features of similar purpose
Replace.
Although additionally, it will be appreciated by those of skill in the art that embodiments more described herein include other embodiments
Some feature included by rather than further feature, but the combination of the feature of different embodiment means to be in the present invention's
Within the scope of and form different embodiments.Such as, in detail in the claims, embodiment required for protection one of arbitrarily
Can mode use in any combination.
The all parts embodiment of the present invention can realize with hardware, or to run on one or more processor
Software module realize, or with combinations thereof realize.It will be understood by those of skill in the art that and can use in practice
Microprocessor or digital signal processor (DSP) realize some in LED drive circuit according to embodiments of the present invention or
The some or all functions of the whole parts of person.The present invention is also implemented as performing method as described herein
Point or whole equipment or device program (such as, computer program and computer program).Such realize this
Bright program can store on a computer-readable medium, or can be to have the form of one or more signal.Such
Signal can be downloaded from internet website and obtain, or provides on carrier signal, or provides with any other form.
The present invention will be described rather than limits the invention to it should be noted above-described embodiment, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference marks that should not will be located between bracket is configured to limitations on claims.Word " comprises " and does not excludes the presence of not
Arrange element in the claims or step.Word "a" or "an" before being positioned at element does not excludes the presence of multiple such
Element.The present invention and can come real by means of including the hardware of some different elements by means of properly programmed computer
Existing.If in the unit claim listing equipment for drying, several in these devices can be by same hardware branch
Specifically embody.Word first, second and third use do not indicate that any order.These word explanations can be run after fame
Claim.
So far, although those skilled in the art will appreciate that the multiple of the most detailed present invention of illustrate and describing show
Example embodiment, but, without departing from the spirit and scope of the present invention, still can be direct according to present disclosure
Determine or derive other variations or modifications of many meeting the principle of the invention.Therefore, the scope of the present invention is it is understood that and recognize
It is set to and covers other variations or modifications all these.
Claims (14)
1. a LED drive circuit, including: feedback control circuit, load impedance increase circuit, wherein,
Described feedback control circuit gathers the operating current of LED, and compares with predetermined threshold value, when the work of described LED
When electric current is more than or equal to described threshold value, described load impedance is driven to increase circuit work, when the operating current of described LED is less than institute
When stating threshold value, described load impedance increases circuit and does not works；
When described load impedance increases circuit work, increase the load equivalent impedance of described LED drive circuit.
LED drive circuit the most according to claim 1, wherein, also includes: rectifier bridge, and described load impedance increases circuit
It is arranged between described rectifier bridge and described LED.
LED drive circuit the most according to claim 2, wherein, described load impedance increases circuit
Including: load impedance increases element and increases the switch element of element in parallel, described switch element with described load impedance
During conducting, described load impedance increases element and is bypassed, and when described switch element disconnects, described load impedance increases element and accesses
Described LED drive circuit, increases the load equivalent impedance of described LED drive circuit.
LED drive circuit the most according to claim 3, wherein, described switch element includes: pliotron, field effect
Pipe or relay.
LED drive circuit the most according to claim 3, wherein, described threshold value is threshold voltage；
Described feedback control circuit includes: current detecting unit, threshold value comparing unit, driver element, described current detecting unit
Gathering the operating current of described LED to be converted into and compare voltage, and input to described threshold value comparing unit, described threshold ratio is relatively
The described voltage that compares is compared by unit with described threshold voltage, when the described voltage that compares is more than or equal to described threshold voltage
Time, control described driver element and start working to drive described load impedance to increase circuit work, when the described voltage that compares is less than
During described threshold voltage, described driver element does not works, and described load impedance increases circuit and do not works.
LED drive circuit the most according to claim 5, wherein, described current detecting unit includes: sampling resistor, transformation
Device or Hall element.
LED drive circuit the most according to claim 6, wherein, described current detecting unit includes: sampling resistor, described
Sampling resistor and described LED strip join, and the operating current of described LED flows through described sampling resistor and produces and described compare voltage.
LED drive circuit the most according to claim 5, wherein, described threshold value comparing unit includes: comparator, described in adopt
Sample resistance is connected to the anode of described comparator, and described threshold voltage accesses the negative terminal of described comparator, described comparator defeated
Going out end and be connected to described driver element, the outfan of described comparator is additionally coupled to the anode of described comparator.
LED drive circuit the most according to claim 8, wherein, described threshold value comparing unit also includes: the first resistance,
Two resistance, the 3rd resistance, the 4th resistance, described sampling resistor is connected to the anode of described comparator by described first resistance,
Described threshold voltage accesses the negative terminal of described comparator by described second resistance, and the outfan of described comparator is by described the
Three resistance are connected to the anode of described comparator, and the outfan of described comparator is connected to described driving by described 4th resistance
Unit.
LED drive circuit the most according to claim 5, wherein, described driver element includes: switch triode, current limliting electricity
Resistance, fly-wheel diode, the base stage of described switch triode is connected to the outfan of described threshold value comparing unit, described switch three pole
The grounded emitter of pipe, the colelctor electrode of described switch triode is connected to described fly-wheel diode, institute by described current-limiting resistance
State the switch element reverse parallel connection of fly-wheel diode and described load impedance increase circuit.
11. LED drive circuits according to claim 10, wherein, also include: power conversion circuit；
Described load impedance increase element be impedance inductance, described switch element is relay, and described relay includes: drive around
Group and relay switch, one end of described driving winding is connected to the colelctor electrode of described switch triode by described current-limiting resistance,
The other end of described driving winding is connected to power supply, described driving winding and described fly-wheel diode reverse parallel connection, described relay
Switch and described impedance inductance in parallel, described impedance inductance two ends connect respectively at described rectifier bridge and described power conversion circuit
Connect.
12. LED drive circuits according to claim 5, wherein, also include: power conversion circuit；
Described driver element includes: optical coupling module, the first divider resistance, the second divider resistance, Zener diode, described optocoupler mould
The input of block is connected to the outfan of described threshold value comparing unit, and the outfan of described optical coupling module is connected to described load resistance
Anti-increase circuit, the bus of described rectifier bridge is connected to described negative by described first divider resistance and described second divider resistance
Carrying impedance and increase the switch element of circuit, two ends with described switch element respectively, the two ends of described Zener diode are connected.
13. LED drive circuits according to claim 12, wherein, it is impedance inductance that described load impedance increases element, institute
Stating switch element is field effect transistor, and the bus of described rectifier bridge is connected by described first divider resistance and described second divider resistance
Being connected to the gate pole of described field effect transistor, the gate pole of described field effect transistor is connected simultaneously to the outfan of described optical coupling module, described
The gate pole of field effect transistor and source electrode two ends with described Zener diode respectively are connected, the two ends of described impedance inductance respectively with institute
Source electrode and the drain electrode of stating field effect transistor connect, with institute while of one end that described impedance inductance is connected with the source electrode of described field effect transistor
State rectifier bridge to connect, with described power conversion circuit while of one end that described impedance inductance is connected with the drain electrode of described field effect transistor
Connect.
14. 1 kinds of LED lamp tube, drive electricity including the LED drive circuit described in any one of claim 1-11 with described LED
At least one LED that road connects, described LED drive circuit is for driving described at least one LED luminescence work after the power-up.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626520.2A CN106102253B (en) | 2016-08-02 | 2016-08-02 | LED drive circuit and LED lamp tube |
| PCT/CN2017/095673 WO2018024220A1 (en) | 2016-08-02 | 2017-08-02 | Led drive circuit and led lamp |
| EP17836402.2A EP3481159B1 (en) | 2016-08-02 | 2017-08-02 | Led drive circuit and led lamp |
| US16/266,014 US10645775B2 (en) | 2016-08-02 | 2019-02-02 | LED drive circuit and LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610626520.2A CN106102253B (en) | 2016-08-02 | 2016-08-02 | LED drive circuit and LED lamp tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106102253A true CN106102253A (en) | 2016-11-09 |
| CN106102253B CN106102253B (en) | 2019-06-25 |
Family
ID=57455100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610626520.2A Active CN106102253B (en) | 2016-08-02 | 2016-08-02 | LED drive circuit and LED lamp tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106102253B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018024220A1 (en) * | 2016-08-02 | 2018-02-08 | 欧普照明股份有限公司 | Led drive circuit and led lamp |
| CN109287022A (en) * | 2017-07-21 | 2019-01-29 | 通用电气照明解决方案有限公司 | LED light |
| CN111600557A (en) * | 2020-05-14 | 2020-08-28 | 锐石创芯（深圳）科技有限公司 | Radio frequency front end module and wireless device |
| WO2021012156A1 (en) * | 2019-07-22 | 2021-01-28 | 深圳市豪恩智能物联股份有限公司 | Lamp tube and protection circuit and protection device applied to same |
| CN112567890A (en) * | 2018-08-17 | 2021-03-26 | 昕诺飞控股有限公司 | LED driver and LED lighting system for use with high frequency electronic ballast |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014009836A2 (en) * | 2012-07-11 | 2014-01-16 | Koninklijke Philips N.V. | Driver circuit between fluorescent ballast and led |
| CN204578852U (en) * | 2015-04-30 | 2015-08-19 | 杰华特微电子（杭州）有限公司 | Antihunt circuit and there is the LED drive circuit of antihunt circuit |
| CN205040055U (en) * | 2015-08-07 | 2016-02-17 | 帝奥微电子有限公司 | Light -emitting diode driving circuit |
| CN206196082U (en) * | 2016-08-02 | 2017-05-24 | 欧普照明股份有限公司 | LED drive circuit and LED fluorescent tube |
-
2016
- 2016-08-02 CN CN201610626520.2A patent/CN106102253B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014009836A2 (en) * | 2012-07-11 | 2014-01-16 | Koninklijke Philips N.V. | Driver circuit between fluorescent ballast and led |
| CN204578852U (en) * | 2015-04-30 | 2015-08-19 | 杰华特微电子（杭州）有限公司 | Antihunt circuit and there is the LED drive circuit of antihunt circuit |
| CN205040055U (en) * | 2015-08-07 | 2016-02-17 | 帝奥微电子有限公司 | Light -emitting diode driving circuit |
| CN206196082U (en) * | 2016-08-02 | 2017-05-24 | 欧普照明股份有限公司 | LED drive circuit and LED fluorescent tube |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018024220A1 (en) * | 2016-08-02 | 2018-02-08 | 欧普照明股份有限公司 | Led drive circuit and led lamp |
| US10645775B2 (en) | 2016-08-02 | 2020-05-05 | Opple Lighting Co., Ltd. | LED drive circuit and LED lamp |
| CN109287022A (en) * | 2017-07-21 | 2019-01-29 | 通用电气照明解决方案有限公司 | LED light |
| CN112567890A (en) * | 2018-08-17 | 2021-03-26 | 昕诺飞控股有限公司 | LED driver and LED lighting system for use with high frequency electronic ballast |
| CN112567890B (en) * | 2018-08-17 | 2023-07-07 | 昕诺飞控股有限公司 | LED driver and LED lighting system for use with high frequency electronic ballasts |
| WO2021012156A1 (en) * | 2019-07-22 | 2021-01-28 | 深圳市豪恩智能物联股份有限公司 | Lamp tube and protection circuit and protection device applied to same |
| CN111600557A (en) * | 2020-05-14 | 2020-08-28 | 锐石创芯（深圳）科技有限公司 | Radio frequency front end module and wireless device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106102253B (en) | 2019-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106102253A (en) | Led drive circuit and led lamp tube | |
| CN205124089U (en) | LED drive circuit and LED lamp | |
| CN106804080B (en) | A kind of LED drive circuit and LED light | |
| US10645775B2 (en) | LED drive circuit and LED lamp | |
| CN104168696A (en) | Compatible LED power circuit | |
| CN105828470A (en) | Wide-voltage, fully-compatible, self-adaptive and single/double-end LED tube | |
| CN105636315A (en) | Lighting device and lighting fixture using same | |
| CN206196082U (en) | LED drive circuit and LED fluorescent tube | |
| CN207216474U (en) | A kind of current sample change-over circuit and LED constant current power supply | |
| CN107734778B (en) | LED driving power circuit and light emitting device | |
| CN103561500A (en) | Output-power-adjustable LED drive circuit compatible with electronic ballast | |
| CN206498577U (en) | A kind of LED/light source drive control circuit inputted for electric ballast | |
| CN206196097U (en) | Lighting device , control chip and linear dimming system | |
| CN205510463U (en) | LED fluorescent tube of single bi -polar of complete compatible self -adaptation of wide voltage | |
| CN107295717A (en) | A kind of control circuit for LED lamp | |
| CN203872421U (en) | DC 12V-48V wide-voltage large-power electrodeless lamp ballast | |
| CN205005320U (en) | Driving circuit of light -emitting diode (LED) fluorescent tube | |
| CN207321588U (en) | Led lamp | |
| CN207118025U (en) | Alternating current circuit module and led light source | |
| CN107087328A (en) | Led drive circuit | |
| CN104582185A (en) | LED driving power supply circuit | |
| CN103945621B (en) | A kind of dim signal generation circuit and LED light adjusting circuit | |
| CN103945623B (en) | The wide voltage high-power electrodeless of a kind of direct current 12V-48V lamp ballast | |
| CN103025035B (en) | Resonant capacitance adjustment element and the current preheating type electric stabilizer that is suitable for | |
| CN103597723B (en) | Method and circuits for PFC |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |