CN107295721A - A kind of electric indicator lamp of LED drive circuit and LED - Google Patents
A kind of electric indicator lamp of LED drive circuit and LED Download PDFInfo
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- CN107295721A CN107295721A CN201710680285.1A CN201710680285A CN107295721A CN 107295721 A CN107295721 A CN 107295721A CN 201710680285 A CN201710680285 A CN 201710680285A CN 107295721 A CN107295721 A CN 107295721A
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- led
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- circuit
- drive circuit
- electric capacity
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Classifications
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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
- H05B45/345—Current stabilisation; Maintaining constant current
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/52—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a parallel array of LEDs
Abstract
The invention discloses a kind of LED drive circuit and the electric indicator lamps of LED, including power module and circuit current-sharing module, circuit current-sharing module includes the parallel connection of N bars, specification identical LED branch roads, every LED branch road includes LED strip, triode, base resistance and emitter resistance, N is the integer not less than 2, wherein：The first end of LED strip is connected with the output plus terminal of power module, second end of LED strip is connected with the first end of base resistance and the colelctor electrode of triode on branch road where it respectively, second end of base resistance is connected with the base stage of triode, the emitter stage of triode is connected with the first end of emitter resistance, second end of emitter resistance is connected with the output negative terminal of power module, and the first end of the base resistance on N bar LED branch roads is connected with each other.The present invention extends the life-span of the electric indicator lamps of LED, reduces the fault rate of the electric indicator lamps of LED, adds the reliability of the electric indicator lamps of LED.
Description
Technical field
The present invention relates to field of LED illumination, the electric indicator lamp of more particularly to a kind of LED drive circuit and LED.
Background technology
With the development of lighting engineering, the application of the electric indicator lamps of LED is more and more extensive.The electric indicator lamps of LED compared to
For by the use of filament heating as the electric indicator lamp of light source, quality has been made moderate progress, still, and existing LED is electrically indicated
The LED drive circuit of lamp is more inferior, and the quality and life-span for causing the electric indicator lamps of LED are remarkably decreased.
Specifically, LED drive circuit includes a plurality of LED branch roads, and LED strip is included on every LED branch road, when there is LED
When short circuit or open circuit occur for the LED strip in branch road, flowing through the electric current of failure LED branch roads can change, so as to cause to flow through it
He also changes at the electric current of non-faulting LED branch roads so that the current unevenness for flowing through each LED branch roads is even.It is existing for the situation
Drive circuit in technology can not carry out balanced adjustment to the electric current for flowing through each LED branch roads, so that due to flowing through each LED branch
The current unevenness on road is even, have impact on luminous mass and the life-span of the electric indicator lamps of LED, adds the failure of the electric indicator lamps of LED
Rate, reduces the safety guarantee coefficient and reliability of the electric indicator lamps of LED.
Therefore, how to provide a kind of scheme for solving above-mentioned technical problem is that those skilled in the art needs solution at present
The problem of.
The content of the invention
It is an object of the invention to provide a kind of LED drive circuit and the electric indicator lamps of LED, the electric indicator lamps of LED are improved
Luminous mass, extend the life-span of the electric indicator lamps of LED, reduce the fault rate of the electric indicator lamps of LED, add LED electricity
The safety guarantee coefficient and reliability of gas indicator lamp.
In order to solve the above technical problems, the invention provides a kind of LED drive circuit, applied to the electric indicator lamps of LED, bag
Power module and circuit current-sharing module are included, the circuit current-sharing module includes the parallel connection of N bars, specification identical LED branch roads, every
The LED branch roads include LED strip, triode, base resistance and emitter resistance, and N is the integer not less than 2, wherein：
The first end of the LED strip is connected with the output plus terminal of the power module, the second end of the LED strip respectively with
The first end of base resistance on branch road where it is connected with the colelctor electrode of the triode, the second end of the base resistance and
The base stage of the triode is connected, and the emitter stage of the triode is connected with the first end of the emitter resistance, the transmitting
Second end of electrode resistance is connected with the output negative terminal of the power module, the first end of the base resistance described in N bars on LED branch roads
It is connected with each other.
Preferably, every LED branch road also includes sub- diode, and the LED drive circuit also includes total diode,
Wherein：
The positive terminal of the sub- diode the second end respectively with the LED strip where it on branch road and the collection of the triode
Electrode is connected, and the negative pole end of the sub- diode described in N bars on LED branch roads is connected with each other, its common port and total diode
Positive terminal is connected, and the first end of the negative pole end of total diode respectively with the base resistance described in N bars on LED branch roads is connected.
Preferably, the power module includes circuit protection module, circuit voltage reduction module and rectifier bridge, the circuit protection
Module includes the first electric capacity, first resistor, negative temperature coefficient NTC resistance, wherein：
The first end and the output plus terminal phase of AC power of the first end of first electric capacity respectively with the first resistor
Even, the second end of first electric capacity is connected with the first end of the NTC resistance and the output negative terminal of the AC power respectively,
Second end of the first resistor is connected with the input of the circuit voltage reduction module, the output end of the circuit voltage reduction module with
The input positive terminal of the rectifier bridge is connected, and the second end of the NTC resistance is connected with the input negative terminal of the rectifier bridge, described whole
The output plus terminal of bridge is flowed as the output plus terminal of the power module, and the output negative terminal of the rectifier bridge is used as the power module
Output negative terminal.
Preferably, the circuit voltage reduction module includes second resistance and the second electric capacity, wherein：
The first end of the second resistance is connected with the first end of second electric capacity, and its common port drops as the circuit
The input of die block, the second end of the second resistance is connected with the second end of second electric capacity, and its common port is used as institute
State the output end of circuit voltage reduction module.
Preferably, the power module also includes the 3rd electric capacity, 3rd resistor and the 4th electric capacity, wherein：
The first end and the output plus terminal of the rectifier bridge of the first end of 3rd electric capacity respectively with the 3rd resistor
It is connected, the second end of the 3rd resistor is connected with the first end of the 4th electric capacity, and its common port is used as the power module
Output plus terminal, the second end of the 3rd electric capacity is born with the second end of the 4th electric capacity and the output of the rectifier bridge respectively
End be connected, its common port as the power module output negative terminal.
Preferably, the circuit board where the LED drive circuit is specially doubling plate.
Preferably, the circuit board is specially the doubling plate handled by gluing.
Preferably, the LED drive circuit also includes circuit current stabilization module, and the circuit current stabilization module includes the pole of voltage stabilizing two
Pipe and positive temperature coefficient PTC resistor, wherein：
The positive terminal of the voltage-regulator diode is connected with the output negative terminal of the power module, the voltage-regulator diode it is negative
Extremely it is connected respectively with the first end of the PTC resistor and the output plus terminal of the power module, the second end of the PTC resistor
It is connected with the first end of the LED strip.
In order to solve the above technical problems, present invention also offers a kind of electric indicator lamps of LED, including any of the above-described kind of LED
Drive circuit.
Preferably, the electric indicator lamps of the LED also include radiator.
The invention provides a kind of LED drive circuit, applied to the electric indicator lamps of LED, including power module and circuit it is equal
Flow module, circuit current-sharing module includes the parallel connection of N bars, specification identical LED branch roads, and every LED branch road includes LED strip, three
Pole pipe, base resistance and emitter resistance, N are the integer not less than 2, wherein：The first end of LED strip and the output of power module
Anode is connected, the first end and the colelctor electrode phase of triode of the second end of LED strip respectively with the base resistance on branch road where it
Even, the second end of base resistance is connected with the base stage of triode, and the emitter stage of triode is connected with the first end of emitter resistance,
Second end of emitter resistance is connected with the output negative terminal of power module, and the first end of the base resistance on N bar LED branch roads is mutual
Connection.
It can be seen that, using the circuit structure of LED drive circuit in the application, when the LED strip short circuit or open circuit that there is LED branch roads
When, because the base voltage of the triode of each LED branch roads is identical, the emitter voltage of each triode is also identical, then each triode
Base stage and emitter stage between voltage it is identical, so the collector current for flowing through each triode is identical, realizes and flow through every
The electric current of LED branch roads it is uniform, improve the luminous mass of the electric indicator lamps of LED, extend the life-span of the electric indicator lamps of LED,
The fault rate of the electric indicator lamps of LED is reduced, the safety guarantee coefficient and reliability of the electric indicator lamps of LED is added.
Present invention also offers a kind of electric indicator lamps of LED, there is identical beneficial effect with above-mentioned LED drive circuit.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to institute in prior art and embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
A kind of structural representation for LED drive circuit that Fig. 1 provides for the present invention；
The structural representation for another LED drive circuit that Fig. 2 provides for the present invention.
Embodiment
The core of the present invention is to provide a kind of LED drive circuit and the electric indicator lamps of LED, improves the electric indicator lamps of LED
Luminous mass, extend the life-span of the electric indicator lamps of LED, reduce the fault rate of the electric indicator lamps of LED, add LED electricity
The safety guarantee coefficient and reliability of gas indicator lamp.
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
It refer to Fig. 1, a kind of structural representation for LED drive circuit that Fig. 1 provides for the present invention.
The LED drive circuit is applied to the electric indicator lamps of LED, including power module 1 and circuit current-sharing module 2, and circuit is equal
Flow module 2 includes the parallel connection of N bars, specification identical LED branch roads, and every LED branch road includes LED strip D, triode Q, base stage electricity
It is the integer not less than 2 to hinder R1 and emitter resistance R2, N, wherein：
LED strip D first end is connected with the output plus terminal of power module 1, and LED strip D the second end where it respectively with propping up
The first end of base resistance R1 on road is connected with triode Q colelctor electrode, base resistance R1 the second end and triode Q base
Extremely it is connected, triode Q emitter stage is connected with emitter resistance R2 first end, emitter resistance R2 the second end and power supply mould
The output negative terminal of block 1 is connected, and the first end of the base resistance R1 on N bar LED branch roads is connected with each other.
Specifically, LED drive circuit includes power module 1 and circuit current-sharing module 2, and LED drive circuit passes through power supply mould
Block 1 is that circuit current-sharing module 2 is powered.Circuit current-sharing module 2 includes a plurality of LED branch roads in parallel, it is contemplated that to ensure to flow through often
The uniformity of the electric current of bar LED branch roads, so the specification of every LED branch road should be identical in circuit current-sharing module 2.
Specifically, the electric indicator lamps of LED include N bar LED branch roads, and every LED branch road includes LED strip D, triode Q, base
Electrode resistance R1 and emitter resistance R2.Base resistance R1 makes triode Q be operated in amplification shape as triode Q biasing resistor
State, meanwhile, base resistance R1 also serves as base stage current-limiting resistance, base current can be prevented excessive, thus protect triode Q not by
Burn.Emitter resistance R2, when LED strip D short circuits or open circuit, flows through emitter resistance R2 electric current as voltage detection resistances
It can change, the voltage at emitter resistance R2 two ends also changes therewith, so as to cause the voltage of emitter stage to change.
When there is the short circuits of the LED strip D on LED branch roads or open circuit, circuit current-sharing module 2 flows through each for balanced adjustment
The electric current of LED branch roads.Specifically, when the LED strip D on the LED branch roads of part is short-circuit, the pressure of the LED strip D on failure LED branch roads
Drop reduces, the base voltage increase of the triode Q where causing on failure LED branch roads, due to the triode Q of each LED branch roads
Base stage is linked together by base resistance R1, so the triode Q base voltages on other non-faulting LED branch roads also increase,
Again because emitter stage is linked together by emitter resistance R2, the base current of the triode Q on each LED branch roads is flowed through
Change, so as to cause the collector current for flowing through the triode Q on each LED branch roads to change.Due to each triode Q's
Base voltage is identical, and each triode Q emitter voltage is also identical, then the voltage between each triode Q base stage and emitter stage
It is identical, that is to say, that each triode Q parameter is mutually matched, so that each triode Q changed collector current is equal
Weighing apparatus adjusts identical to the collector current for flowing through each triode Q, namely the electric current flowed through on each LED branch roads is uniform.As all LED
When LED strip D on branch road is short-circuit, the electric indicator lamps of LED do not work, and flow through the electric current increase of every LED branch road.
When there is the open circuits of the LED strip D on the LED branch roads of part, the electric current increase on other non-faulting LED branch roads is flowed through,
Due to the colelctor electrode open circuit of the triode Q on failure LED branch roads, diode common equivalent to one this triode Q, based on upper
Principle is stated, because the parameter of triode Q on non-faulting LED branch roads is mutually matched, therefore, the electricity increased on non-faulting LED branch roads
Stream mean allocation, namely the electric current flowed through on each non-faulting LED branch roads are uniform.Break when there is the LED strip D on all LED branch roads
The electric indicator lamp of Lu Shi, LED does not work, and all triodes also do not work.
It can be seen that, when the LED strip D short circuits or open circuit that there is LED branch roads, due to the triode Q of each LED branch roads parameter phase
Mutually matching, realizes the uniform of the electric current that flows through every LED branch road.In addition, broken down so long as not all LED strip D, should
The non-faulting LED strip D of the electric indicator lamps of LED is still with same Brightness Duty, and simply brightness size is varied from, by reality
Service condition from the point of view of, both of these case occur probability it is very low, enhance the safety guarantee coefficient of the electric indicator lamps of LED.
The invention provides a kind of LED drive circuit, applied to the electric indicator lamps of LED, including power module and circuit it is equal
Flow module, circuit current-sharing module includes the parallel connection of N bars, specification identical LED branch roads, and every LED branch road includes LED strip, three
Pole pipe, base resistance and emitter resistance, N are the integer not less than 2, wherein：The first end of LED strip and the output of power module
Anode is connected, the first end and the colelctor electrode phase of triode of the second end of LED strip respectively with the base resistance on branch road where it
Even, the second end of base resistance is connected with the base stage of triode, and the emitter stage of triode is connected with the first end of emitter resistance,
Second end of emitter resistance is connected with the output negative terminal of power module, and the first end of the base resistance on N bar LED branch roads is mutual
Connection.
It can be seen that, using the circuit structure of LED drive circuit in the application, when the LED strip short circuit or open circuit that there is LED branch roads
When, because the base voltage of the triode of each LED branch roads is identical, the emitter voltage of each triode is also identical, then each triode
Base stage and emitter stage between voltage it is identical, so the collector current for flowing through each triode is identical, realizes and flow through every
The electric current of LED branch roads it is uniform, improve the luminous mass of the electric indicator lamps of LED, extend the life-span of the electric indicator lamps of LED,
The fault rate of the electric indicator lamps of LED is reduced, the safety guarantee coefficient and reliability of the electric indicator lamps of LED is added.
On the basis of above-described embodiment：
It refer to Fig. 2, the structural representation for another LED drive circuit that Fig. 2 provides for the present invention.
As a kind of preferred embodiment, every LED branch road also includes sub- diode D1, and LED drive circuit also includes
Total diode D2, wherein：
Sub- diode D1 positive terminal the second end respectively with the LED strip D where it on branch road and triode Q colelctor electrode
It is connected, the negative pole end of the sub- diode D1 on N bar LED branch roads is connected with each other, the positive terminal phase of its common port and total diode D2
Even, first end of the total diode D2 negative pole end respectively with the base resistance R1 on N bar LED branch roads is connected.
Specifically, sub- diode D1 is increased between the LED strip D and base resistance R1 on every LED branch road, it is all
Pass through a total diode D2 connection between sub- diode D1 and all base resistance R1.When the LED strip D hairs on LED branch roads
During raw short circuit, flowing into the electric current of each LED branch roads can increase, in this course, have the increased electric current in part to be diverted to son two
In pole pipe D1, then electric current is assigned to the base stage of the triode Q on each LED branch roads by total diode D2.
The C-V characteristic of diode is that electric current and voltage have exponent relation, and when voltage minor variations, electric current exponentially becomes
Change.Therefore, when short circuit occurs for the LED strip D on LED branch roads, LED strip D voltage changes, i.e. the son two of branch road where it
Pole pipe D1 voltage changes, then sub- diode D1 electric current index variation therewith.Sub- diode D1 now and total two pole
Equivalent to one variable resistor of pipe D2, when the electric current for flowing through sub- diode D1 and total diode D2 increases, its resistance increases therewith
Greatly, so that electric current reduces.Therefore, sub- diode D1 and total diode D2 presence, prevent increased electric current from entirely falling in respectively
On the triode Q of LED branch roads, so as to protect triode Q not to be burned.
As a kind of preferred embodiment, power module 1 includes circuit protection module, circuit voltage reduction module and rectifier bridge,
Circuit protection module includes the first electric capacity, first resistor, NTC (Negative Temperature Coefficient, negative temperature
Coefficient) resistance, wherein：
The first end of first electric capacity is connected with the first end of first resistor and the output plus terminal of AC power respectively, the first electricity
The second end held is connected with the first end of NTC resistance and the output negative terminal of AC power respectively, the second end and the electricity of first resistor
The input of road voltage reduction module is connected, and the output end of circuit voltage reduction module is connected with the input positive terminal of rectifier bridge, and the of NTC resistance
Two ends are connected with the input negative terminal of rectifier bridge, the output plus terminal of rectifier bridge as power module 1 output plus terminal, rectifier bridge it is defeated
Go out negative terminal as the output negative terminal of power module 1.
Specifically, power module 1 includes circuit protection module, circuit voltage reduction module and rectifier bridge, and circuit voltage reduction module is used
In the voltage of reduction AC power, the alternating current that rectifier bridge is used for the AC power by voltage is reduced is transformed into direct current.This Shen
Rectifier bridge rectification please be use, compared to discrete component, trouble point can be efficiently reduced.
Circuit protection module includes the first electric capacity, first resistor, NTC resistance, specifically, it is contemplated that in industrial electrical environments
There are many noises, the input using the first electric capacity in AC power is filtered, so as to ensure that the stabilization of AC power
Property, the first electric capacity can also suppression common mode interference generation.First resistor is prevented as the protective resistance of ac power input end
Element is burnt during overtension.NTC resistance as absorb surge element, when AC power connect moment, NTC resistance it is initial
Resistance is very big, equivalent to open circuit, and suppressing AC power, to be just switched on immediate current excessive, so as to protect LED drive circuit；
During LED drive circuit progresses into normal working condition, with the increase for the electric current for flowing through NTC resistance, NTC resistance
Temperature gradually rise, cause the resistance value of NTC resistance to be gradually reduced so that the normal work of LED drive circuit not by NTC electricity
The influence of resistance.
As a kind of preferred embodiment, circuit voltage reduction module includes second resistance and the second electric capacity, wherein：
The first end of second resistance is connected with the first end of the second electric capacity, its common port as circuit voltage reduction module input
End, the second end of second resistance is connected with the second end of the second electric capacity, its common port as circuit voltage reduction module output end.
Specifically, circuit voltage reduction module here includes second resistance and second electric capacity in parallel with second resistance, uses
Second capacitance decompression, is depressured efficiency high.Here the resistance of second resistance is larger, when LED drive circuit works, the big portion of electric current
Be diverted into the second electric capacity, the second electric capacity can store electricity, when LED drive circuit has a power failure, second resistance and with second resistance simultaneously
One loop of the second electric capacity formation of connection, being stored in the electricity of the second electric capacity can be discharged by second resistance, prevent too high
Voltage burn out other elements.
Certainly, the application can also be from other decompression modes, and the present invention is not particularly limited herein, according to actual feelings
Condition is determined.
As a kind of preferred embodiment, power module 1 also includes the 3rd electric capacity, 3rd resistor and the 4th electric capacity, wherein：
The first end of 3rd electric capacity is connected with the first end of 3rd resistor and the output plus terminal of rectifier bridge respectively, 3rd resistor
The second end be connected with the first end of the 4th electric capacity, its common port as power module 1 output plus terminal, the second of the 3rd electric capacity
End is connected with the second end of the 4th electric capacity and the output negative terminal of rectifier bridge respectively, and its common port is born as the output of power module 1
End.
Specifically, 3rd resistor is used for current-limiting protection, and the 3rd electric capacity is as low frequency rectifying and wave-filtering electric capacity, for rectifier bridge
Output signal be filtered, the 4th electric capacity is as high-frequency filter capacitor, and three make it that the output signal of power module 1 is more steady
It is fixed.
As a kind of preferred embodiment, the circuit board where LED drive circuit is specially doubling plate.
Specifically, the circuit board where LED drive circuit selects doubling plate, on the one hand, doubling plate can all be arranged with two sides
Electronic component, reduces space-consuming, meets limitation standard of the country to the electric indicator lamp sizes of LED；On the other hand, when
When LED strip D on LED branch roads is short-circuit, the triode Q of failure LED branch roads collector current is than larger, and doubling plate contributes to
The radiating of LED drive circuit, so as to prevent the triode Q of failure LED branch roads to be burned.
As a kind of preferred embodiment, circuit board is specially the doubling plate handled by gluing.
Specifically, circuit board gluing is handled, and enhances dust-proof, moistureproof, protection against electric shock ability, to adapt to the industrial ring of complexity
Border.
As a kind of preferred embodiment, LED drive circuit also includes circuit current stabilization module, and circuit current stabilization module includes steady
Diode and PTC (Positive Temperature Coefficient, positive temperature coefficient) resistance are pressed, wherein：
The positive terminal of voltage-regulator diode is connected with the output negative terminal of power module 1, the negative pole end of voltage-regulator diode respectively with
The first end of PTC resistor is connected with the output plus terminal of power module 1, and the second end of PTC resistor is connected with LED strip D first end.
Voltage-regulator diode and PTC resistor are that circuit current-sharing module 2 provides stable electric current, and specifically, voltage-regulator diode is
Circuit current-sharing module 2 provides stable voltage, and electric current adjustment element is done using PTC resistor, when the electric current for flowing through PTC resistor increases
When, the temperature rise of PTC resistor so as to cause the resistance value of PTC resistor to increase, reduces electric current, conversely, electric when flowing through PTC
When the electric current of resistance reduces, the temperature reduction of PTC resistor, so as to cause the resistance value of PTC resistor to reduce, increases electric current.
Present invention also offers a kind of electric indicator lamps of LED, including any of the above-described kind of LED drive circuit.
The introduction of LED drive circuit refer to above-mentioned LED drive circuit in the electric indicator lamps of LED provided for the present invention
Embodiment, the present invention will not be repeated here.
The electric indicator lamps of LED also include the crown top of burner and lamppost, specifically, and circuit board where LED drive circuit is from crown top of burner side
To loading, there are four clip slots on lamppost, four clip slots are used for fixing circuit board, installed simple and practical.The electric indicator lamps of LED
Two binding posts leave cable-through hole, during mounting circuit boards, and two main power lines are through cable-through hole and are welded on binding post, then
Just weld the power line of LED disks.
As a kind of preferred embodiment, the electric indicator lamps of LED also include radiator.
In order to further spread the heat produced when the electric indicator lamps of LED work, radiating is installed on the electric indicator lamps of LED
Device.
It should be noted that in this manual, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
1. a kind of LED drive circuit, applied to the electric indicator lamps of LED, it is characterised in that flow mould including power module and circuit
Block, the circuit current-sharing module includes the parallel connection of N bars, specification identical LED branch roads, and every LED branch road includes LED
String, triode, base resistance and emitter resistance, N are the integer not less than 2, wherein：
The first end of the LED strip is connected with the output plus terminal of the power module, the second end of the LED strip respectively with its institute
The first end of base resistance on branch road is connected with the colelctor electrode of the triode, the second end of the base resistance with it is described
The base stage of triode is connected, and the emitter stage of the triode is connected with the first end of the emitter resistance, the emitter stage electricity
Second end of resistance is connected with the output negative terminal of the power module, and the first end of the base resistance described in N bars on LED branch roads is mutual
Connection.
2. LED drive circuit as claimed in claim 1, it is characterised in that every LED branch road also includes sub two pole
Pipe, the LED drive circuit also includes total diode, wherein：
The positive terminal of the sub- diode the second end respectively with the LED strip where it on branch road and the colelctor electrode of the triode
It is connected, the negative pole end of the sub- diode described in N bars on LED branch roads is connected with each other, the positive pole of its common port and total diode
End is connected, and the first end of the negative pole end of total diode respectively with the base resistance described in N bars on LED branch roads is connected.
3. LED drive circuit as claimed in claim 1, it is characterised in that the power module includes circuit protection module, electricity
Road voltage reduction module and rectifier bridge, the circuit protection module include the first electric capacity, first resistor, negative temperature coefficient NTC resistance, its
In：
The first end of first electric capacity is connected with the first end of the first resistor and the output plus terminal of AC power respectively, institute
The second end for stating the first electric capacity is connected with the first end of the NTC resistance and the output negative terminal of the AC power respectively, described
Second end of first resistor is connected with the input of the circuit voltage reduction module, the output end of the circuit voltage reduction module with it is described
The input positive terminal of rectifier bridge is connected, and the second end of the NTC resistance is connected with the input negative terminal of the rectifier bridge, the rectifier bridge
Output plus terminal as the output plus terminal of the power module, the output negative terminal of the rectifier bridge is used as the defeated of the power module
Go out negative terminal.
4. LED drive circuit as claimed in claim 3, it is characterised in that the circuit voltage reduction module include second resistance and
Second electric capacity, wherein：
The first end of the second resistance is connected with the first end of second electric capacity, and its common port is depressured mould as the circuit
The input of block, the second end of the second resistance is connected with the second end of second electric capacity, and its common port is used as the electricity
The output end of road voltage reduction module.
5. LED drive circuit as claimed in claim 3, it is characterised in that the power module also includes the 3rd electric capacity, the 3rd
Resistance and the 4th electric capacity, wherein：
The first end of 3rd electric capacity is connected with the first end of the 3rd resistor and the output plus terminal of the rectifier bridge respectively,
Second end of the 3rd resistor is connected with the first end of the 4th electric capacity, its common port as the power module output
Anode, the second end of the 3rd electric capacity the second end respectively with the 4th electric capacity and the output negative terminal phase of the rectifier bridge
Even, its common port as the power module output negative terminal.
6. LED drive circuit as claimed in claim 5, it is characterised in that the circuit board where the LED drive circuit is specific
For doubling plate.
7. LED drive circuit as claimed in claim 6, it is characterised in that the circuit board is specially to be handled by gluing
Doubling plate.
8. the LED drive circuit as described in claim any one of 1-7, it is characterised in that the LED drive circuit also includes electricity
Road current stabilization module, the circuit current stabilization module includes voltage-regulator diode and positive temperature coefficient PTC resistor, wherein：
The positive terminal of the voltage-regulator diode is connected with the output negative terminal of the power module, the negative pole end of the voltage-regulator diode
It is connected respectively with the first end of the PTC resistor and the output plus terminal of the power module, the second end of the PTC resistor and institute
The first end for stating LED strip is connected.
9. a kind of electric indicator lamps of LED, it is characterised in that including the LED drive circuit as described in claim any one of 1-8.
10. the electric indicator lamps of LED as claimed in claim 9, it is characterised in that the electric indicator lamps of LED also include radiating
Device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710680285.1A CN107295721B (en) | 2017-08-10 | 2017-08-10 | LED drive circuit and LED electric indicator lamp |
| PCT/CN2017/114957 WO2019029068A1 (en) | 2017-08-10 | 2017-12-07 | Led driving circuit and led electrical indicator light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710680285.1A CN107295721B (en) | 2017-08-10 | 2017-08-10 | LED drive circuit and LED electric indicator lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107295721A true CN107295721A (en) | 2017-10-24 |
| CN107295721B CN107295721B (en) | 2023-05-09 |
Family
ID=60105903
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710680285.1A Active CN107295721B (en) | 2017-08-10 | 2017-08-10 | LED drive circuit and LED electric indicator lamp |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107295721B (en) |
| WO (1) | WO2019029068A1 (en) |
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| CN108738202A (en) * | 2018-07-12 | 2018-11-02 | 江苏鼎云信息科技有限公司 | It is a kind of to wait the uniform circuit of voltages or non-uniform circuit, device and preparation method thereof |
| WO2019029068A1 (en) * | 2017-08-10 | 2019-02-14 | 广东工业大学 | Led driving circuit and led electrical indicator light |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107295721B (en) | 2023-05-09 |
| WO2019029068A1 (en) | 2019-02-14 |
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