CN106954312B - A kind of current balance LED drive circuit - Google Patents
A kind of current balance LED drive circuit Download PDFInfo
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- CN106954312B CN106954312B CN201710293239.6A CN201710293239A CN106954312B CN 106954312 B CN106954312 B CN 106954312B CN 201710293239 A CN201710293239 A CN 201710293239A CN 106954312 B CN106954312 B CN 106954312B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The invention discloses a kind of current balance LED drive circuits, including：Public diode and n switching capacity unit；Wherein, n is the positive integer more than or equal to 1；Each switching capacity unit includes capacitor, the first diode and the second diode；Each switching capacity unit in addition to n-th of switching capacity unit further includes third diode；The present invention is converted by the voltage of AC power between positive negative level, and the capacitor alternate run of each switching capacity unit is in the state of charging and discharging, all LED module being attached thereto average currents having the same in n switching capacity unit；By controlling the output voltage or electric current of AC power, the charge sum that the capacitor of all switching capacity units is flowed in or out in the control unit interval may be implemented, to achieve the purpose that adjust LED module brightness；And the structure of each switching capacity unit is simple, can be with flexible expansion.
Description
Technical field
The present invention relates to field of LED drive technology, more particularly to a kind of current balance LED drive circuit.
Background technology
With the development of modern society's science and technology, LED light has become current photograph because of the advantages that its is efficient, long lifespan
The main product in bright market and display screen market.In view of the luminous power of single LED module is limited and the factors such as heat management
Limitation, therefore multiple LED monomers are usually contained in a LED information display system.In order to ensure each monomer sends out identical brightness, need
LED drive circuit is wanted to have the function of ensuring all LED monomers Current compliances.Current share scheme the simplest is that will own
LED it is monomer series-connected together share an electric current, but this can greatly reduce system reliability.
In the prior art, another popular current share scheme is by all LED monomers in a LED information display system point
At again each modules in parallel is run after multiple concatenated LED modules, this just needs driving circuit to have multi output, brightness-adjustable
The function of being flowed with multimode group.Since most driving circuits based on this current share scheme are both for 2 or 4 LED
Module.Requirement for more high brightness, it is desirable to total LED monomers are divided into the module of more, with this improve system can
By property.But this just needs driving circuit to have the function of multi-path flow equalizing output, and specific output way is with flexible
Demand.At the same time, the cost and design difficulty of system cannot be dramatically increased while increasing output way.This is current
The most of implacable requirement of driving circuit.Therefore, a kind of multi-path flow equalizing, extension simple in structure and easy how to be designed
LED drive circuit be now urgent need to resolve the problem of.
Invention content
The present inventionPurpose be to provide a kind of current balance LED drive circuit, with reach driven by balanced electric current it is more
A LED module purpose, and the structure of circuit is simple, easily extension, is conducive to marketing and user experience.
In order to solve the above technical problems, the present invention provides a kind of current balance LED drive circuit, including：Public diode
With n switching capacity unit；Wherein, n is the positive integer more than or equal to 2；
Each switching capacity unit includes capacitor, the first diode and the second diode；Wherein, described first
The cathode of diode its common end that is connected with the anode of second diode is connected with the anode of the capacitor, and described second
The cathode of diode is used to connect the anode of corresponding LED module；
The switching capacity unit further includes third diode each of in addition to n-th of switching capacity unit；Wherein,
The cathode of the third diode is connected with the cathode of the capacitor, and the anode of the third diode is for connecting alternating current
First output end in source；
The anode of first diode in the 1st switching capacity unit is used to connect the of the AC power
Two output ends；
The sun of first diode each of in addition to the 1st switching capacity unit in the switching capacity unit
The public affairs that pole is connected with the cathode of the cathode of the capacitor in the previous switching capacity unit and the third diode
End is connected altogether；
The cathode of the capacitor in n-th of switching capacity unit is used to connect the first defeated of the AC power
Outlet；
The cathode of the public diode is used to connect the second output terminal of the AC power, the public diode
Anode is used to connect the cathode of the LED module of the cathode connection of second diode in each switching capacity unit.
Optionally, which further includes：N filter condenser；
Wherein, the anode of each filter condenser with it is described in corresponding each switching capacity unit
The cathode of second diode is connected, and the cathode of each filter condenser is connected with the anode of the public diode.
Optionally, which further includes：N resonant inductor；
Wherein, the first end of each resonant inductor with the institute in corresponding each switching capacity unit
The anode for stating capacitor is connected, the second end of each resonant inductor with corresponding each switching capacity unit
In second diode anode be connected.
Optionally, which further includes：N LED module；
Wherein, the anode of each LED module with described the in corresponding each switching capacity unit
The cathode of two diodes is connected, and the cathode of each LED module is connected with the anode of the public diode.
Optionally, which further includes：Electricity for the output that the output of DC power supply is converted to the AC power
Power electronic power translation circuit；
Wherein, the positive input terminal of the electric and electronic power translation circuit is used to connect the anode of the DC power supply, institute
The negative input end for stating electric and electronic power translation circuit is used to connect the cathode of the DC power supply, and the electric and electronic power becomes
Change the positive output end of circuit respectively in the switching capacity unit each of in addition to n-th of switching capacity unit described in
The cathode of the anode of third diode and the capacitor in n-th of switching capacity unit is connected, the power electronics
The negative output terminal of power conversion circuit is connected with the cathode of the public diode.
Optionally, the electric and electronic power translation circuit, including：Inductor and full-controlled switch pipe；
Wherein, the first end of the full-controlled switch pipe is used to connect the anode of the DC power supply, and the full-control type is opened
Close pipe second end be connected with the first end of the inductor its common end respectively in addition to n-th of switching capacity unit
The electricity in the anode and n-th of switching capacity unit of the third diode in each switching capacity unit
The cathode of container is connected, and the second end of the inductor is connected its common end with the cathode of the public diode for connecting institute
State the cathode of DC power supply.
A kind of current balance LED drive circuit provided by the present invention, including：Public diode and n switching capacity list
Member；Wherein, n is the positive integer more than or equal to 2；Each switching capacity unit includes capacitor, the first diode and the
Two diodes；The switching capacity unit further includes third diode each of in addition to n-th of switching capacity unit；
As it can be seen that negative half period of the present invention in AC power, the electricity in n switching capacity unit in each switching capacity unit
Container is electrically charged；Capacitor in the positive half cycle of AC power, each switching capacity unit gives the LED module being attached thereto to supply
Electricity；As the voltage of AC power converts between positive negative level, the capacitor alternate run of each switching capacity unit is filling
Electricity and discharge condition；The charge integration of outflow capacitance, institute should be equal to according to the charge integration for flowing into capacitance in one cycle
There is the LED module being attached thereto average current having the same；By controlling the output voltage or electric current of AC power, Ke Yishi
The charge that the capacitor of all switching capacity units in n switching capacity unit is flowed in or out in the now control unit interval is total
Number, to achieve the purpose that adjust LED module brightness；And the structure of each switching capacity unit is simple, can with flexible expansion,
Be conducive to marketing and user experience.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
A kind of structure chart for current balance LED drive circuit that Fig. 1 is provided by the embodiment of the present invention；
The structure chart for another current balance LED drive circuit that Fig. 2 is provided by the embodiment of the present invention；
Negative half period of another current balance LED drive circuit that Fig. 3 is provided by the embodiment of the present invention in AC power
Operation mode；
Positive half cycle of another current balance LED drive circuit that Fig. 4 is provided by the embodiment of the present invention in AC power
Operation mode；
The structure chart for another current balance LED drive circuit that Fig. 5 is provided by the embodiment of the present invention；
The structure chart for another current balance LED drive circuit that Fig. 6 is provided by the embodiment of the present invention；
The electric and electronic power for another current balance LED drive circuit that Fig. 7 is provided by the embodiment of the present invention converts
The schematic diagram of the various structures of circuit.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to FIG. 1, a kind of structure chart for current balance LED drive circuit that Fig. 1 is provided by the embodiment of the present invention.It should
Circuit may include：Public diode 40 and n switching capacity unit 20.Wherein, n is the positive integer more than or equal to 2.
Each switching capacity unit includes capacitor, the first diode and the second diode；Wherein, first diode
Cathode its common end that is connected with the anode of the second diode is connected with the anode of capacitor, and the cathode of the second diode is for connecting
The anode of corresponding LED module；
Each switching capacity unit in addition to n-th of switching capacity unit further includes third diode；Wherein, the three or two pole
The cathode of pipe is connected with the cathode of capacitor, and the anode of third diode is used to connect the first output end of AC power；
The anode of the first diode in 1st switching capacity unit is used to connect the second output terminal of AC power；
The anode of the first diode in each switching capacity unit in addition to the 1st switching capacity unit is opened with previous
The common end that the cathode of capacitor in the capacitor cell of pass is connected with the cathode of third diode is connected；
The cathode of capacitor in n-th of switching capacity unit is used to connect the first output end of AC power；
The cathode of public diode is used to connect the second output terminal of AC power, and the anode of public diode is for connecting
The cathode of the LED module of the cathode connection of the second diode in each switching capacity unit.
As shown in Figure 1, each switching capacity unit includes capacitor (C in n switching capacity unit 20S), the one or two
Pole pipe (D1) and the second diode (D2), it opens for the 1st switching capacity unit 20_1 to (n-1)th in n switching capacity unit 20
It further includes third diode (D to close capacitor cell 20_n-13)；
Wherein, the cathode of the first diode of each switching capacity unit and respective the in n switching capacity unit 20
The anode of two diodes its common end that is connected is connected with the anode of respective capacitor, is each opened in n switching capacity unit 20
The cathode for closing the second diode of capacitor cell is used to be connected with the anode of a respective individually corresponding LED module；
The 1st switching capacity unit 20_1 to (n-1)th switching capacity unit 20_n-1 is each in n switching capacity unit 20
From the cathode of capacitor be connected with the cathode of respective third diode, the 1st switching capacity in n switching capacity unit
The anode of unit 20_1 to the (n-1)th respective third diode of switching capacity unit 20_n-1 is used to and AC power 10
First output end is connected；
The anode of the first diode of 20_1 is for the second output terminal phase with AC power in 1st switching capacity unit
Even；Third diode in the cathode of capacitor in 1st switching capacity unit 20_1 and the 1st switching capacity unit 20_1
The connected common end and the first diode in the 2nd switching capacity unit 20_2 in n switching capacity unit 20 of cathode
Anode is connected；
The cathode of capacitor in n switching capacity unit 20 in i-th of switching capacity unit 20_i and i-th of switch
The connected common end of the cathode of third diode in capacitor cell 20_i is switched with i+1 in n switching capacity unit 20
The anode of the first diode in capacitor cell is connected；I is the positive integer more than or equal to 2 and less than n-1；
The cathode of capacitor in (n-1)th switching capacity unit 20_n-1 and (n-1)th switching capacity unit 20_n-1
In third diode the connected common end of cathode in n-th switching capacity unit 20_n in n switching capacity unit 20
The first diode anode be connected；
The cathode of capacitor in n-th of switching capacity unit 20_n is for the first output end phase with AC power 10
Even；
The cathode of public diode 40 with the second output terminal of AC power 20 for being connected, the sun of public diode 40
The LED module that pole is used to connect with the cathode of the second diode in each switching capacity unit in n switching capacity unit 20
Cathode be connected.
It is understood that the capacitor in n switching capacity unit 20 in each switching capacity unit can be such as Fig. 1
Shown in polarized capacitance (CS), or polarity free capacitor, the present embodiment are unrestricted to this.For each switch
The concrete type and connection relation of circuit element in capacitor cell, can be as shown in this embodiment, or other types
With corresponding connection relation.As long as it is balanced to ensure that each switching capacity unit can export the LED module being attached thereto
Electric current, for the concrete type and connection relation of the circuit element in each switching capacity unit, the present embodiment does not do any
Limitation.
It should be noted that the current balance LED drive circuit that the present embodiment is provided can also include as shown in Figure 1
AC power 10 and/or n LED module 30.The present embodiment is unrestricted to this.Can be for the quantity of LED module
The quantity equal with switching capacity unit, such as each switching capacity unit connect a LED module；Or compare switching capacity
The case where few quantity of unit, the switching capacity unit that such as there is predetermined number is not connected with LED module.The present embodiment is same to this
It is unrestricted.
When preferably, in order to make LED module work, the flicker of the invisible LED module of user can set AC power 10
It is set to high-frequency ac power, to improve the rate of the charging and discharging of capacitor, the flicker frequency of LED modules is made to reach naked eyes
Sightless frequency；In order to improve the stability of each LED modules work in n LED module 30, AC power 10 is avoided
When output frequency is not high, there is the visible flicker of user in LED module, improves user experience, the driving electricity that the present embodiment is provided
Road can also include n filter condenser；When in order to ensure 10 output voltage of AC power, capacitor is in the process of charging and discharging
In each circuit element safety, the driving circuit that the present embodiment is provided can also include n resonant inductor；In order to pre-
In the case of the not connected LED module of switching capacity unit for ordering quantity, ensure that other LED modules can be used normally, this implementation
The driving circuit that example is provided can also include n voltage-stabiliser tube, and the connection type of voltage-stabiliser tube can be with the connection of filter condenser
Mode is similar；In order to ensure that the driving circuit that the present embodiment is provided can be used in DC power supply as in the case of output,
The driving circuit that the present embodiment is provided can also include electric and electronic power translation circuit, and the output of DC power supply is converted
The output of AC power 10.The driving circuit that the present embodiment is provided can also include other circuit elements, to reach more preferably
Effect, specific connection relation of this implementation for the concrete type of other elements and in the driving circuit that the present embodiment is provided
Do not do any restrictions.
In the present embodiment, the embodiment of the present invention is in the negative half period of AC power, each switch electricity in n switching capacity unit
The capacitor held in unit is electrically charged；Capacitor in the positive half cycle of AC power, each switching capacity unit is connected therewith
The LED module power supply connect；As the voltage of AC power converts between positive negative level, the capacitor of each switching capacity unit
Alternate run is in the state of charging and discharging；It should be equal to outflow capacitance according to the charge integration for flowing into capacitance in one cycle
Charge integration, all LED module being attached thereto average currents having the same；By control AC power output voltage or
The capacitance that all switching capacity units in n switching capacity unit are flowed in or out in the control unit interval may be implemented in electric current
The charge sum of device, to achieve the purpose that adjust LED module brightness；And the structure of each switching capacity unit is simple, can
With flexible expansion, be conducive to marketing and user experience.
Based on above-described embodiment the output of AC power 10 is avoided in order to improve the stability of each LED module work
When frequency is not high, there is the visible flicker of user in LED module, improves user experience, the driving circuit that the present embodiment is provided is also
May include n filter condenser.Specifically, please refer to Fig.2, Fig. 3 and Fig. 4, Fig. 2 provided by the embodiment of the present invention it is another
A kind of structure chart of current balance LED drive circuit；Fig. 3 is driven by another current balance LED that the embodiment of the present invention provides
Operation mode of the dynamic circuit in the negative half period of AC power；Another current balance LED that Fig. 4 is provided by the embodiment of the present invention
Operation mode of the driving circuit in the positive half cycle of AC power.The circuit may include：N filter condenser.
Wherein, each filter condenser (C in n filter condenserO) anode it is electric with corresponding n switch
Hold the second diode (D in a switching capacity unit in unit 202) cathode be connected, each filtered in n filter condenser
The cathode of wave capacitor is connected with the anode of public diode 40.
It is understood that can be as shown in Figure 2, each LED module can be connected in parallel on corresponding filtering
Capacitor both ends.Each filter condenser can be polarized capacitance (C as shown in Figure 2 in n filter condenserO), also may be used
Think that polarity free capacitor, the present embodiment are unrestricted to this.
Specifically, can be with reference chart 3 and Fig. 4, Fig. 3 is the negative half period of AC power 10, institute in n switching capacity unit 20
It is charged by AC power 10 after thering is the capacitor of switching capacity unit to connect together by the first diode, n filter condenser
In each filter condenser power to a LED module in n LED module connected in parallel；Fig. 4 be AC power 10 just
Half cycle, the capacitor of the 1st to the (n-1)th switching capacity unit (20_1-20_n-1) passes through each in n switching capacity unit 20
From the LED module that respectively connects of the second diode, third diode and public diode 40 and filter condenser power supply, n
Second diode and public diode of the capacitor of n-th of switching capacity unit 20_n by itself in switching capacity unit 20
40 to the n-th string LED module and n-th of filter condenser power supply.
In the present embodiment, the embodiment of the present invention can improve each LED modules work by the way that n filter condenser is arranged
Stability, when avoiding the output frequency of AC power 10 not high, there is the visible flicker of user in LED module, improves user's body
It tests.
Based on above-mentioned any embodiment, when in order to ensure 10 output voltage of AC power, capacitor had been charged and discharged
The safety of each circuit element in journey, the driving circuit that the present embodiment is provided can also include n resonant inductor.Specifically
Can with reference chart 5, in n resonant inductor the first end of each resonant inductor with corresponding n switching capacity
The anode of capacitor in unit 20 in a switching capacity unit is connected, each resonant inductor in n resonant inductor
Anode phase of the second end with the second diode in a switching capacity unit in corresponding n switching capacity unit 20
Even.
In the present embodiment, by the setting of n resonant inductor, it can ensure electricity in 10 output voltage of AC power
The safety of container each circuit element during charging and discharging, the case where avoiding instantaneous voltage excessively high damage circuit element, are sent out
It is raw.
Based on above-mentioned any embodiment, in order to ensure that the driving circuit that the present embodiment is provided can be in DC power supply conduct
It is used in the case of output, the driving circuit that the present embodiment is provided can also include electric and electronic power translation circuit, will
The output of the output conversion AC power of DC power supply.
Specifically can be with reference chart 6, the positive input terminal of electric and electronic power translation circuit 10_2 is with DC power supply 10_1's
Anode is connected, and the negative input end of electric and electronic power translation circuit 10_2 is connected with the cathode of the DC power supply, power electronics
The positive output end of power conversion circuit 10_2 as AC power the first output end (10_3) respectively with n switching capacity unit
In 20 the anode of the 1st switching capacity unit 20_1 to (n-1)th respective third diode of switching capacity unit 20_n-1 and
The cathode of capacitor in n-th of switching capacity unit 20_n is connected, the negative output terminal of electric and electronic power translation circuit 10_2
Second output terminal (10_4) as AC power is connected with the cathode of public diode 40.
Wherein, the physical circuit element composition of electric and electronic power translation circuit 10_2 and corresponding connection relation, can be with
Include inductor and full-controlled switch pipe for 10 type as show in Figure 7, such as electric and electronic power translation circuit 10_2
When, the both ends of inductor are connected respectively at the positive output end of electric and electronic power translation circuit 10_2 with negative output terminal；Full-control type
Switching tube includes first end, second end and control terminal, wherein the first end and second end of full-controlled switch pipe is electric with electric power respectively
The positive input terminal of sub- power conversion circuit 10_2 is connected with positive output end；The negative input end of electric and electronic power translation circuit 10_2
It is connect with the negative output terminal of electric and electronic power translation circuit 10_2；Or the both ends of inductor become respectively at electric and electronic power
The positive output end for changing circuit 10_2 is connected with negative output terminal；Full-controlled switch pipe includes first end, second end and control terminal,
In, the first end and second end of full-controlled switch pipe respectively with the negative output terminal of electric and electronic power translation circuit 10_2 and just defeated
Enter end connection；The positive output of the negative input end and electric and electronic power translation circuit 10_2 of electric and electronic power translation circuit 10_2
End connection；Or full-controlled switch pipe includes first end, second end and control terminal, wherein the first end of full-controlled switch pipe and
Second end is connect with the negative output terminal of electric and electronic power translation circuit 10_2 and positive output end respectively；Distinguish at the both ends of inductor
It is connected with negative input end in the positive output end of electric and electronic power translation circuit 10_2；Electric and electronic power translation circuit 10_2's
Positive input terminal is connect with the negative output terminal of electric and electronic power translation circuit 10_2；And full-controlled switch pipe include first end,
Second end and control terminal, wherein the first end and second end of full-controlled switch pipe respectively with electric and electronic power translation circuit 10_
2 negative output terminal is connected with positive output end；Positive input of the both ends of inductor respectively at electric and electronic power translation circuit 10_2
End is connected with negative output terminal；The negative input end of electric and electronic power translation circuit 10_2 and electric and electronic power translation circuit 10_2
Positive output end connection.When electric and electronic power translation circuit 10_2 includes coupling inductor and full-controlled switch pipe, full-control type
Switching tube includes first end, second end and control terminal, wherein the second end of full-controlled switch pipe and electric and electronic power transformation electricity
The negative input end of road 10_2 connects；One end of coupling transformer primary coil is just defeated with electric and electronic power translation circuit 10_2's
Enter end connection, the other end is connect with the second end of full-controlled switch pipe；The both ends of coupling transformer secondary coil respectively with electric power
The positive output end of electronic power translation circuit 10_2 is connected with negative output terminal.Electric and electronic power translation circuit 10_2 includes one
When half-bridge circuit, the upper end of half-bridge circuit is the positive input terminal of electric and electronic power translation circuit 10_2；The midpoint of half-bridge circuit
For the positive output end of electric and electronic power translation circuit 10_2；The lower end of half-bridge circuit is electric and electronic power translation circuit simultaneously
The negative input end and negative output terminal of 10_2.When electric and electronic power translation circuit 10_2 includes half-bridge circuit and coupling inductor,
The upper end of half-bridge circuit is the positive input terminal of electric and electronic power translation circuit 10_2；The lower end of half-bridge circuit is power electronics work(
The negative input end of rate translation circuit 10_2；The anode of the primary coil of coupling inductor and the midpoint of half-bridge circuit connect, negative terminal
It is connect with the lower end of half-bridge circuit；The anode of the secondary coil of coupling inductor is negative with electric and electronic power translation circuit 10_2's
Output end connects, and negative terminal is connect with the positive output end of electric and electronic power translation circuit 10_2.Electric and electronic power translation circuit
When 10_2 includes full-bridge circuit, the top and bottom of full-bridge circuit are respectively the positive input of electric and electronic power translation circuit 10_2
End and negative input end；The midpoint of the first half-bridge and the midpoint of the second half-bridge are respectively electric and electronic power transformation electricity in full-bridge circuit
The positive output end and negative output terminal of road 10_2.Electric and electronic power translation circuit 10_2 includes full-bridge circuit and coupling inductor
When, the top and bottom of full-bridge circuit are respectively the positive input terminal and negative input end of electric and electronic power translation circuit 10_2；Coupling
The both ends for closing the primary coil of inductor are connect with the midpoint of the first half-bridge in full-bridge circuit and the midpoint of the second half-bridge respectively；Coupling
The both ends for closing the secondary coil of inductor are respectively the positive output end and negative output terminal of electric and electronic power translation circuit 10_2.
It is understood that the physical circuit element composition of electric and electronic power translation circuit 10_2 and corresponding connection are closed
System, can be 10 type as show in Figure 7, or other types, as long as can ensure that electric and electronic power becomes
Circuit 10_2 is changed the output of the AC power of the transformation of the output of DC power supply 10_1 can to convert electric and electronic power
The physical circuit element composition and corresponding connection relation, the present embodiment of circuit 10_2 does not do any restrictions.
In the present embodiment, by the setting of electric and electronic power translation circuit 10_2, the present embodiment can be made to be provided
Current balance LED drive circuit is as input in DC power supply 10_1, is driven to each LED module, into one
Step improves scene workable for driving circuit, is conducive to marketing.
Each embodiment is described by the way of progressive in specification, the highlights of each of the examples are with other realities
Apply the difference of example, just to refer each other for identical similar portion between each embodiment.Professional can also further anticipate
Know, unit and algorithm steps described in conjunction with the examples disclosed in the embodiments of the present disclosure, it can be with electronic hardware, calculating
The combination of machine software or the two realizes, in order to clearly illustrate the interchangeability of hardware and software, in the above description
Through generally describing each exemplary composition and step according to function.These functions are held with hardware or software mode actually
Row depends on the specific application and design constraint of technical solution.Professional technician can carry out each specific application
It uses different methods to achieve the described function, but such implementation should not be considered as beyond the scope of the present invention.
Current balance LED drive circuit provided by the present invention is described in detail above.Tool used herein
Principle and implementation of the present invention are described for body example, and the explanation of above example is only intended to help to understand this hair
Bright method and its core concept.It should be pointed out that for those skilled in the art, not departing from the present invention
, can be with several improvements and modifications are made to the present invention under the premise of principle, these improvement and modification also fall into right of the present invention
It is required that protection domain in.
Claims (6)
1. a kind of current balance LED drive circuit, which is characterized in that including：Public diode and n switching capacity unit；Its
In, n is the positive integer more than or equal to 2；
Each switching capacity unit includes capacitor, the first diode and the second diode；Wherein, the one or two pole
The cathode of pipe its common end that is connected with the anode of second diode is connected with the anode of the capacitor, the two or two pole
The cathode of pipe is used to connect the anode of corresponding LED module；
The switching capacity unit further includes third diode each of in addition to n-th of switching capacity unit；Wherein, described
The cathode of third diode is connected with the cathode of the capacitor, and the anode of the third diode is for connecting AC power
First output end；
The anode of first diode in the 1st switching capacity unit is used to connect the second defeated of the AC power
Outlet；
The anode of first diode each of in addition to the 1st switching capacity unit in the switching capacity unit with
The common end that the cathode of the capacitor in the previous switching capacity unit is connected with the cathode of the third diode
It is connected；
The cathode of the capacitor in n-th of switching capacity unit is used to connect the first output of the AC power
End；
The cathode of the public diode is used to connect the second output terminal of the AC power, the anode of the public diode
The cathode for the LED module that cathode for connecting second diode in each switching capacity unit connects.
2. current balance LED drive circuit according to claim 1, which is characterized in that further include：N filter condenser；
Wherein, the anode of each filter condenser with described second in corresponding each switching capacity unit
The cathode of diode is connected, and the cathode of each filter condenser is connected with the anode of the public diode.
3. current balance LED drive circuit according to claim 2, which is characterized in that further include：N resonant inductor；
Wherein, the first end of each resonant inductor with the electricity in corresponding each switching capacity unit
The anode of container is connected, the second end of each resonant inductor in corresponding each switching capacity unit
The anode of second diode is connected.
4. current balance LED drive circuit according to claim 3, which is characterized in that further include：N LED module；
Wherein, the anode of each LED module with the described 2nd 2 in corresponding each switching capacity unit
The cathode of pole pipe is connected, and the cathode of each LED module is connected with the anode of the public diode.
5. current balance LED drive circuit according to any one of claims 1 to 4, which is characterized in that further include：For
The output of DC power supply is converted to the electric and electronic power translation circuit of the output of the AC power；
Wherein, the positive input terminal of the electric and electronic power translation circuit is used to connect the anode of the DC power supply, the electricity
The negative input end of power electronic power translation circuit is used to connect the cathode of the DC power supply, the electric and electronic power transformation electricity
The positive output end on road respectively with the third in the switching capacity unit each of in addition to n-th of switching capacity unit
The cathode of the anode of diode and the capacitor in n-th of switching capacity unit is connected, the electric and electronic power
The negative output terminal of translation circuit is connected with the cathode of the public diode.
6. current balance LED drive circuit according to claim 5, which is characterized in that the electric and electronic power transformation
Circuit, including：Inductor and full-controlled switch pipe；
Wherein, the first end of the full-controlled switch pipe is used to connect the anode of the DC power supply, the full-controlled switch pipe
Second end be connected with the first end of the inductor its common end respectively with each of in addition to n-th of switching capacity unit
The capacitor in the anode of the third diode in the switching capacity unit and n-th of switching capacity unit
Cathode be connected, the second end of the inductor be connected with the cathode of the public diode its common end for connect it is described directly
The cathode in galvanic electricity source.
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| CN201710293239.6A CN106954312B (en) | 2017-04-28 | 2017-04-28 | A kind of current balance LED drive circuit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1349297A (en) * | 2000-10-17 | 2002-05-15 | 欧姆龙株式会社 | Buffer circuit, and power conversion device using same |
| CN102196632A (en) * | 2010-03-17 | 2011-09-21 | 三垦电气株式会社 | LED driving device |
| CN102802303A (en) * | 2011-05-24 | 2012-11-28 | 日亚化学工业株式会社 | Light-emitting diode driving apparatus including charging/discharging capacitor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2713488B1 (en) * | 2012-09-28 | 2020-04-15 | OSRAM GmbH | Electronic converter, and related lighting system and method of operating an electronic converter |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1349297A (en) * | 2000-10-17 | 2002-05-15 | 欧姆龙株式会社 | Buffer circuit, and power conversion device using same |
| CN102196632A (en) * | 2010-03-17 | 2011-09-21 | 三垦电气株式会社 | LED driving device |
| CN102802303A (en) * | 2011-05-24 | 2012-11-28 | 日亚化学工业株式会社 | Light-emitting diode driving apparatus including charging/discharging capacitor |
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| CN106954312A (en) | 2017-07-14 |
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Address after: No. 253, Hengli Junma Road, Hengli Town, Dongguan, Guangdong 523460 Patentee after: Guangdong Qingzhou Photoelectric Technology Co.,Ltd. Address before: 523460 No.3, xiaotiantou 1st Road, Xinsi village, Hengli Town, Dongguan City, Guangdong Province Patentee before: LETARON ELECTRONIC CO.,LTD. |