CN107454710B - A kind of linear constant current driving circuit - Google Patents
A kind of linear constant current driving circuit Download PDFInfo
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- CN107454710B CN107454710B CN201710405311.XA CN201710405311A CN107454710B CN 107454710 B CN107454710 B CN 107454710B CN 201710405311 A CN201710405311 A CN 201710405311A CN 107454710 B CN107454710 B CN 107454710B
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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]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
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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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- 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
- H05B45/395—Linear regulators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The present invention provides a kind of linear constant current driving circuit, comprising: alternating current, rectifier, n LED unit, m energy-storage units, energy release circuit and control circuit；The input of rectifier is electrically connected with city, and output includes anode and cathode；N LED unit all includes four terminals: input, output end, control terminal and ground terminal；M energy-storage units all include four terminals: input, output end, control terminal and ground terminal.It the advantage is that the storage capacitor in energy-storage units assumes responsibility for a part of the difference of line voltage and LED pressure drop, change limitation of the traditional scheme to LED pressure drop, keep the selection of LED pressure drop more flexible；The LED current deviation in each LED unit can be changed in the energy release of energy-storage units, and LED luminance consistency, which can get, to be improved.
Description
Technical field
The present invention relates to a kind of linear constant current driving circuits, are suitable for LED illumination and drive.
Background technique
Currently, LED illumination, with its energy conservation, environmental protection and long-life promote rapidly, and LED lamp widely enters
The illumination application of every field.LED cannot connect directly to alternating current, need to configure corresponding current limliting driving device, current LED
Drive the scheme used based on traditional high frequency switch power, for the program due to needing high-frequency switch circuit, circuit is complicated, at
This height, the linear constant current drive scheme so that numerous manufacturers convert.
Fig. 1 is a kind of current common linear constant current driving driving circuit, wherein alternating current 1VAC connection rectifier 1BD's
Both ends are inputted, the output both ends of rectifier 1BD are LED power supply.Here, LED be divided into 1LED1,1LED2,1LED3 ... and
1LEDn several segments are sequentially connected in series, and form several series connection nodes, the highest series connection node of current potential is with rectifier 1BD's
Anode is connected, other series connection nodes successively with several current sources 1I1,1I2,1I3 ... and one end of 1In is connected, several
Current source 1I1,1I2,1I3 ... and 1In the other end it is in parallel after be connected with the output negative pole of rectifier bridge 1BD.
Control circuit to control 1I1,1I2,1I3 ... and 1In gradually conducting.
During the out of phase of alternating current 1VAC, the voltage amplitude of rectifier 1BD output is different, the conducting shape of each current source
State is also different.When line voltage is near zero-crossing point, current source 1I1,1I2,1I3 ... and 1In is flowed through without electric current；
When amplitude of the commercial power is greater than the turn-on threshold of 1LED1, there is electric current to flow through on current source 1I1；When amplitude of the commercial power be greater than 1LED1 and
When the sum of turn-on threshold of 1LED2, there is electric current to flow through on current source 1I2, current source 1I1 cut-off；, when amplitude of the commercial power is greater than
When the sum of turn-on threshold of 1LED1,1LED2 and 1LED3, there is electric current to flow through on current source 1I3, current source 1I1 and 1I2 cut-off；
And so on, when amplitude of the commercial power be greater than 1LED1,1LED2,1LED3 ... and 1LEDn the sum of turn-on threshold when, current source
There is electric current to flow through on 1In, current source 1I1,1I2,1I3 ... and 1In-1 is turned off.
Above scheme can obtain higher power factor and lower harmonic distortion, but the disadvantage is that:
1) turn-on threshold of LED, which needs, and amplitude of the commercial power matches could obtain acceptable efficiency, such as
220vac input, the pressure drop of LED are generally set to 250V or so, this selection for allowing for LED is restricted.
2) current average for flowing through each section of LED differs greatly, and LED luminance consistency is poor.
Summary of the invention
The present invention provides a kind of linear constant current driving circuits, to overcome the deficiencies of existing technologies, solve above-mentioned technology
Problem.
The present invention provides a kind of linear constant current driving circuits, including alternating current, rectifier, n LED unit, m energy storage list
Member, energy release circuit and control circuit；N and m is natural number；The input of rectifier is electrically connected with city, output include anode and
Cathode；N LED unit all includes four terminals: input, output end, control terminal and ground terminal；M energy-storage units all include
Four terminals: input, output end, control terminal and ground terminal；The positive phase of the input terminal of first LED unit and rectifier
Even；The output end of n-th of LED unit is connected with the input terminal of first energy-storage units；In addition to the output end of n-th of LED unit,
The output end of LED unit is connected with the input terminal of adjacent LED unit；Outside input terminal in addition to first energy-storage units, energy storage
The input terminal of unit is connected with the output end of adjacent energy-storage units；The ground terminal of n LED unit and the ground connection of m energy-storage units
End is connect with the cathode of rectifier；The control terminal of n LED unit and the control terminal of m energy-storage units are connected to control circuit；Energy
Measuring release circuit has m input terminal and k output end, and k is the natural number less than or equal to n, the input terminal of energy release circuit
It is sequentially connected with the input terminal of m energy-storage units；K output end is connected with some or all of the input terminal of n LED unit；
Energy release circuit includes at least one single-way switch, the energy in m energy-storage units is discharged into defeated with energy release circuit
In the connected LED unit of outlet.
Further, the present invention provides a kind of linear constant current driving circuits, also have the feature that n LED unit difference
For LED unit 1, LED unit 2 ..., LED unit n, m energy-storage units be respectively energy-storage units 1, energy-storage units 2 ...,
Energy-storage units m；The input terminal of LED unit 1 is connected with the anode of rectifier, the output end of LED unit 1 and the input of LED unit 2
End is connected, the output end of LED unit 2 is connected with the input terminal of LED unit 3 ..., the output end and energy-storage units of LED unit n
1 input terminal is connected, the output end of energy-storage units 1 is connected with the input terminal of energy-storage units 2, the output end of energy-storage units 2 and storage
Can unit 3 input terminal be connected ..., the output end of energy-storage units n is hanging.
Further, the present invention provides a kind of linear constant current driving circuit, also have the feature that n LED unit is all wrapped
It includes, LED, the first current source and the first blocking diode；The anode of LED is connected to the input terminal of LED unit, the cathode of LED and
The anode of first blocking diode is connected, and the cathode of the first blocking diode is connected to the output end of LED unit；First current source
Comprising two power ends and a signal end, one in two power ends is connected to the anode of the first blocking diode, another
The ground terminal of a connection LED unit, signal end are connected to the control terminal of LED unit.
Further, the present invention provides a kind of linear constant current driving circuit, m energy-storage units are also had the feature that all
Including storage capacitor, the second current source, the second blocking diode and discharge diode；One end of storage capacitor is connected to energy storage list
The input terminal of member, the other end are connected with the anode of the second blocking diode；The cathode of second blocking diode and energy-storage units
Output end is connected；Second current source includes two power ends and a signal end, and one in two power ends is connected to second
The anode of blocking diode, the ground terminal of another connection energy-storage units, signal end are connected to the control terminal of energy-storage units, discharge
The ground terminal of the anode connection energy-storage units of diode, cathode are connected to the anode of the second blocking diode.
Further, the present invention provides a kind of linear constant current driving circuit, also have the feature that at least one is unidirectionally opened
Part or all closed is at least one diode.
Further, the present invention provides a kind of linear constant current driving circuit, any single-way switch is also had the feature that
With an anode and a cathode, anode is connected with an input terminal of energy release circuit, cathode and energy release circuit
An output end be connected.
Further, the present invention provides a kind of linear constant current driving circuit, any single-way switch is also had the feature that
With an anode and several cathodes, the anode of single-way switch is connected to an input terminal of energy release circuit, several
Cathode is connected respectively to several output ends of energy release circuit.
Further, the present invention provides a kind of linear constant current driving circuit, any single-way switch is also had the feature that
With several anodes and a cathode, the anode of single-way switch is connected respectively to several input terminals of energy release circuit,
Cathode is connected to an output end of energy release circuit.
Further, the present invention provides a kind of linear constant current driving circuit, any single-way switch is also had the feature that
It is divided into the first single-way switch and the second single-way switch, the first single-way switch has several anodes and a cathode, and second is unidirectional
Switch has several cathodes and an anode；Several anodes of first single-way switch are connected respectively to energy release circuit
Input terminal；The cathode of first single-way switch is connected with the anode of the second single-way switch；Several cathodes of second single-way switch point
It is not connected to the output end of energy release circuit.
Further, the present invention provides a kind of linear constant current driving circuit, also have the feature that control circuit includes,
Several error amplifiers and the one-to-one signal criterion of error amplifier and current-to-voltage convertor；Error amplifier
In-phase end is connected with signal criterion respectively, and reverse side is all connected to the output end of current-to-voltage convertor, several output ends point
It is not connect with the control terminal of the control terminal of n LED unit, m energy-storage units；The input terminal detection of current-to-voltage convertor flows through
The electric current of rectifier.
Further, the present invention provides a kind of linear constant current driving circuit, control circuit control the is also had the feature that
The current setting value of the second current source in the first current source, the 1st to m-th energy-storage units in 1 to n-th LED unit according to
It is secondary to be incremented by.
Detailed description of the invention
Fig. 1 current linear constant current driving circuit.
Fig. 2 is linear constant current driver circuit schematic diagram of the invention.
Fig. 3 is the schematic diagram of LED unit.
Fig. 4 is the schematic diagram of energy-storage units.
Fig. 5 is the linear constant current driving circuit figure in embodiment one.
Fig. 6 is energy release circuit figure in one variation of embodiment.
Fig. 7 is the linear constant current driving circuit figure in embodiment two.
Fig. 8 is energy release circuit figure in two variation of embodiment.
Fig. 9 is the linear constant current driving circuit figure in embodiment three.
Figure 10 is energy release circuit figure in three variation of embodiment.
Figure 11 is the linear constant current driving circuit figure in example IV.
Figure 12 is energy release circuit figure in example IV variation.
Specific embodiment:
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 2 is linear constant current driver circuit schematic diagram of the invention.
A kind of linear constant current driving circuit, comprising: alternating current 2VAC, 2BD, n LED units of rectifier, m energy-storage units,
Energy release circuit and control circuit.
The input of rectifier 2BD is connected with alternating current 2VAC, and output includes anode and cathode.
N LED unit be respectively LED unit 1, LED unit 2, LED unit 3 ..., LED unit n.In n LED unit
Each include four terminals: input terminal I, output end O, control terminal C and ground terminal G.
M energy-storage units be respectively energy-storage units 1, energy-storage units 2, energy-storage units 3 ..., energy-storage units m.M energy storage
Each of unit includes four terminals: input terminal I, output end O, control terminal C and ground terminal G.
Rectifier 2BD anode be connected with the input terminal I of LED unit 1, composition LED unit node 1, LED unit 1 it is defeated
Outlet O is connected to the input terminal I of LED unit 2, constitutes LED unit node 2, the output end O of LED unit 2 is connected to LED unit 3
Input terminal I, constitute LED unit node 3 ..., the output end O of LED unit n-1 be connected to the input terminal I of LED unit n, structure
At LED unit node n.
The output end O of LED unit n is connected with the input terminal I of energy-storage units 1, constitutes energy-storage units node 1, energy-storage units 1
Output end O be connected to the input terminal I of energy-storage units 2, constitute energy-storage units node 2, the output end O of energy-storage units 2 is connected to
The input terminal I of energy-storage units 3, constitute energy-storage units node 3 ..., the input terminal I of energy-storage units m-1 be connected to energy-storage units m
Input terminal I, constitute energy-storage units node m, the output end O of energy-storage units m is hanging.
The ground terminal G of n LED unit and the ground terminal G of m energy-storage units are connect with the cathode of rectifier 2BD.
The control terminal C of n LED unit and the control terminal C of m energy-storage units are all connected to control circuit.
Energy release circuit have m input terminal and k output end, m input terminal respectively with m energy-storage units node phase
Even, i.e., it is connected with the input terminal I of m energy-storage units.K is less than or equal to n, that is to say, the quantity of the output end of energy release circuit is small
In the quantity for being equal to LED unit.
K output end is connected with part or all in n LED unit node, i.e., and in the input terminal I of LED unit
Part or all be connected.
Energy release circuit includes at least one single-way switch, the energy in m energy-storage units is discharged into n
One or more of LED unit.Certainly, the LED unit not connecting with the output end of energy release circuit does not receive m then
The energy of energy-storage units.
Fig. 3 is the schematic diagram of LED unit.
LED unit includes: LED 301, the first current source 302 and the first blocking diode 303.
The anode of LED 301 is connected to the cathode and the first blocking diode 303 of the input terminal I, LED 301 of LED unit
Anode be connected, the cathode of the first blocking diode is connected to the output end O of LED unit.First current source 302 includes two function
Rate end and a signal end, one in two power ends is connected to the anode of the first blocking diode 303, another is connected to
Ground terminal G, signal end are connected to the control terminal C of LED unit.
Fig. 4 is the schematic diagram of energy-storage units.
Energy-storage units include: storage capacitor 401, the second current source 402, the second blocking diode 403 and discharge diode
404.One end of storage capacitor 401 is connected to the input terminal I of energy-storage units, the anode of the other end and the second blocking diode 403
It is connected, the cathode of the second blocking diode 403 is connected with the output end O of energy-storage units.Second current source 402 includes two power
End and a signal end, one in two power ends is connected to the anode of the second blocking diode 403, another is connected to storage
The ground terminal G of energy unit, signal end are connected to the control terminal C of energy-storage units, and the anode of discharge diode 404 meets ground terminal G, yin
Pole is connected to the anode of the second blocking diode 403.
Control circuit includes: several error amplifiers and the one-to-one signal criterion of error amplifier and electric current electricity
Pressure converter.The in-phase end of error amplifier is connected with signal criterion respectively, and reverse side is all connected to current-to-voltage convertor
Output end, several output ends are connect with the control terminal of the control terminal of n LED unit, m energy-storage units respectively.Current Voltage
The electric current of the rectified device of input terminal detection stream of converter.
Signal criterion is incremented by successively, and output through error amplifier controls n LED unit and m energy-storage units, the respectively
The setting value of first current source of 1 to n-th LED unit and the second current source setting value of the 1st to m-th energy-storage units according to
It is secondary to be incremented by.
As shown in Fig. 2, when the rectified device 2BD of alternating current 2VAC generates electric current to LED unit 1 and the power supply of LED unit 2, control
The first current source in circuit control LED unit 1 processed disconnects；When the rectified device 2BD of alternating current 2VAC is to LED unit 1, LED unit 2
When generating electric current with the power supply of LED unit 3, control circuit controls the first current source in LED unit 1 and LED unit 2 and disconnects；With
This analogizes；When the rectified device 2BD of alternating current 2VAC to LED unit 1, LED unit 2, LED unit 3 ..., LED unit n power supply produce
When raw electric current, control circuit control LED unit 1, LED unit 2, LED unit 3 ..., the first current source in LED unit n-1
It disconnects.
When the rectified device 2BD of alternating current 2VAC to LED unit 1, LED unit 2, LED unit 3 ..., LED unit n and energy storage
When the power supply of unit 1 generates electric current, control circuit control LED unit 1, LED unit 2, LED unit 3 ... and in LED unit n
First current source disconnects；When the rectified device 2BD of alternating current 2VAC to LED unit 1, LED unit 2, LED unit 3 ..., LED unit
N, when energy-storage units 1 and the power supply of energy-storage units 2 generate electric current, control circuit controls LED unit 1, LED unit 2, LED unit
3 ..., the second current source in the first current source and energy-storage units 1 in LED unit n disconnects；When the rectified device of alternating current 2VAC
2BD to LED unit 1, LED unit 2, LED unit 3 ..., LED unit n, energy-storage units 1, energy-storage units 2, energy-storage units 3 supply
When electricity generates electric current, control circuit control LED unit 1, LED unit 2, LED unit 3 ..., the first electric current in LED unit n
The second current source in source and energy-storage units 1 and energy-storage units 2 disconnects；And so on；When the rectified device 2BD of alternating current 2VAC gives
LED unit 1, LED unit 2, LED unit 3 ..., LED unit n, energy-storage units 1, energy-storage units 2, energy-storage units 3 ...,
Energy-storage units m power supply generate electric current when, control circuit control LED unit 1, LED unit 2, LED unit 3 ..., LED unit n
In the first current source and energy-storage units 1, energy-storage units 2, energy-storage units 3 ... and the second current source in energy-storage units m-1
It disconnects.
The energy stored in m energy-storage units is discharged into via the single-way switch inside energy release circuit and releases with energy
It puts in the connected LED unit of circuit output end.
When some or certain several LED units are not connected with the output end of energy release circuit, then m energy-storage units are not received
Energy, be not limited to shown in Fig. 2.
Embodiment one
Fig. 5 is the linear constant current driving circuit in embodiment one.
As shown in figure 5, the linear constant current driving circuit in the present embodiment includes: alternating current 9VAC, rectifier 9BD, three LED
Unit, three energy-storage units, energy release circuit and control circuit.
The input of rectifier 9BD is connected with alternating current 9VAC, and output includes anode and cathode.
Three LED units are respectively LED unit 1, LED unit 2 and LED unit 3, and three energy-storage units are respectively energy storage list
Member 1, energy-storage units 2 and energy-storage units 3.
Each of three LED units include four terminals: input terminal I, output end O, control terminal C and ground terminal G, and three
Each of a energy-storage units include four terminals: input terminal I, output end O, control terminal C and ground terminal G.
Rectifier 9BD anode be connected with the input terminal I of LED unit 1, composition LED unit node 1, LED unit 1 it is defeated
Outlet O is connected to the input terminal I of LED unit 2, constitutes LED unit node 2, the output end O of LED unit 2 is connected to LED unit 3
Input terminal I, constitute LED unit node 3, the output end O of LED unit three is connected with the input terminal I of energy-storage units 1, and composition is stored up
Can cell node 1, energy-storage units 1 output end O be connected to the input terminal I of energy-storage units 2, constitute energy-storage units node 2, energy storage
The output end O of unit 2 is connected to the input terminal I of energy-storage units 3, constitutes energy-storage units node 3, and the output end O of energy-storage units 3 is outstanding
It is empty.
The cathode of the ground terminal G and rectifier 9BD of the ground terminal G and three energy-storage units of three LED units are connected to one
It rises.
Energy release circuit includes: 3 single-way switch.Single-way switch uses 3 diodes 9D1,9D2 and 9D3.Energy is released
Electric discharge road also has 3 input terminals and 3 output ends.The anode of 3 diodes 9D1,9D2 and 9D3 are 3 input terminals, with 3
Energy-storage units node is connected；Cathode is 3 output ends, is connected with 3 LED unit nodes.
The anode of diode is connected respectively to energy-storage units node 1 corresponding with energy release circuit input terminal, energy storage list
First node 2 and energy-storage units node 3, cathode be connected respectively to LED unit node 3 corresponding with energy release circuit output end,
LED unit node 2 and LED unit node 1.
When the current potential of diode 9D1 anode is higher than the current potential of cathode, 9D1 conducting, by the storage capacitor in energy-storage units 1
Energy is discharged into LED unit 3；When the current potential of diode 9D2 anode is higher than the current potential of cathode, 9D2 conducting, by energy-storage units
Storage capacitor energy in 2 is discharged into LED unit 2；When the current potential of diode 9D3 anode is higher than the current potential of cathode, 9D3 is led
It is logical, the storage capacitor energy in energy-storage units 3 is discharged into LED unit 1.
Control circuit include error amplifier 9EA1,9EA2 ..., 9EA6, signal criterion 1, signal criterion 2 ..., letter
Number benchmark 6, current-to-voltage convertor 9I/V.Wherein error amplifier 9EA1,9EA2 ..., the in-phase end of 9EA6 successively with letter
Number benchmark 1, signal criterion 2 ..., signal criterion 6 be connected, be connected to the defeated of current-to-voltage convertor 9I/V after reverse side is in parallel
Outlet, the electric current of the rectified device 9BD of the input terminal detection stream of current-to-voltage convertor 9I/V.
Signal criterion 1, signal criterion 2 ... signal criterion 6 is incremented by successively, through error amplifier 9EA1,9EA2 ...,
The output control LED unit 1 of 9EA6, LED unit 2, LED unit 3, energy-storage units 1, energy-storage units 2, the electricity in energy-storage units 3
The current setting value in stream source is incremented by successively.
When the rectified device 9BD of alternating current 9VAC generates electric current to LED unit 1 and the power supply of LED unit 2, control circuit control
Current source in LED unit 1 disconnects；When the rectified device 9BD of alternating current 9VAC powers to LED unit 1, LED unit 2 and LED unit 3
When generating electric current, control circuit controls the current source in LED unit 1 and LED unit 2 and disconnects；As the rectified device 9BD of alternating current 9VAC
When generating electric current to the power supply of LED unit 1, LED unit 2, LED unit 3 and energy-storage units 1, control circuit control LED unit 1,
Current source in LED unit 2, LED unit 3 disconnects；When the rectified device 9BD of alternating current 9VAC is to LED unit 1, LED unit 2, LED
When unit 3, energy-storage units 1 and the power supply of energy-storage units 2 generate electric current, it is mono- that control circuit controls LED unit 1, LED unit 2, LED
Current source in member 3 and energy-storage units 1 disconnects；When the rectified device 9BD of alternating current 9VAC is to LED unit 1, LED unit 2, LED unit
3, energy-storage units 1, energy-storage units 2 and energy-storage units 3 power supply generate electric current when, control circuit control LED unit 1, LED unit 2,
Current source in LED unit 3, energy-storage units 1 and energy-storage units 2 disconnects.
The beneficial effect of the present embodiment is: the storage capacitor in energy-storage units assumes responsibility for the difference of line voltage and LED pressure drop
A part, change limitation of the traditional scheme to LED pressure drop, keep the selection of LED pressure drop more flexible；The energy of energy-storage units is released
The LED current deviation that can be changed in each LED unit is put, LED luminance consistency, which can get, to be improved.
One variation one of embodiment
Fig. 6 is energy release circuit figure in one variation of embodiment.
Embodiment is 3 first is that identical with the quantity of energy-storage units with LED unit.
In this variation, the quantity of LED unit and energy-storage units can be any number, LED unit and energy-storage units
It can not be identical.The quantity of single-way switch is mutually all m with the quantity of energy-storage units, respectively 5D1,5D2 ... 5Dm, with energy storage
Unit corresponds；When the quantity of LED unit is greater than the quantity of energy-storage units, i.e. when n is greater than m, certain LED unit nodes can not
It is connect with the output end of energy release circuit.
Embodiment two
Fig. 7 is the linear constant current driving circuit in embodiment two.
As shown in fig. 7, the linear constant current driving circuit in the present embodiment includes: alternating current 10VAC, rectifier 10BD, three
LED unit, an energy-storage units, energy release circuit and control circuit.
The input of rectifier 10BD is connected with alternating current 10VAC, and output includes anode and cathode.
Three LED units are respectively LED unit 1, LED unit 2 and LED unit 3.
Each of three LED units include four terminals: input terminal I, output end O, control terminal C and ground terminal G, storage
Energy unit includes four terminals: input terminal I, output end O, control terminal C and ground terminal G.
Rectifier 10BD anode be connected with the input terminal I of LED unit 1, composition LED unit node 1, LED unit 1 it is defeated
Outlet O is connected to the input terminal I of LED unit 2, constitutes LED unit node 2, the output end O of LED unit 2 is connected to LED unit 3
Input terminal I, constitute LED unit node 3, the output end O of LED unit 3 is connected with the input terminal I of energy-storage units, composition energy storage
The output end O of cell node, energy-storage units is hanging.
The ground terminal G of three LED units and the ground terminal G and the cathode of rectifier 10BD of energy-storage units link together.
Energy release circuit includes: a single-way switch.The single-way switch uses 3 diodes 10D1,10D2 and 10D3.
The anode of 3 diodes links together, and constitutes an anode of single-way switch, and the cathode of 3 diodes is respectively unidirectionally opened
3 cathodes closed.
Energy release circuit also has 1 input terminal and 3 output ends, the anode of single-way switch and energy release circuit
1 input terminal connection, realization are connected with energy-storage units node；3 cathodes of single-way switch are respectively that 3 of energy release circuit are defeated
Outlet is connected with 3 LED unit nodes.
When the current potential of diode 10D1 anode is higher than the current potential of cathode, 10D1 conducting, by the energy storage electricity in energy-storage units
Hold energy to be discharged into LED unit 3；When the current potential of diode 10D2 anode is higher than the current potential of cathode, 10D2 conducting, by energy storage
Storage capacitor energy in unit is discharged into LED unit 2；When the current potential of diode 10D3 anode is higher than the current potential of cathode,
10D3 conducting, the storage capacitor energy in energy-storage units is discharged into LED unit 1.
Control circuit include error amplifier 10EA1,10EA2 ..., 10EA4, signal criterion 1, signal criterion 2 ...
Signal criterion 4, current-to-voltage convertor 10I/V.Wherein error amplifier 10EA1,10EA2 ..., the in-phase end of 10EA4 according to
It is secondary with signal criterion 1, signal criterion 2 ... signal criterion 4 is connected, and is connected to current-to-voltage convertor after reverse side is in parallel
The output end of 10I/V, the electric current of the rectified device 10BD of the input terminal detection stream of current-to-voltage convertor 10I/V.
Signal criterion 1, signal criterion 2 ... signal criterion 4 is incremented by successively, through error amplifier 10EA1,
10EA2 ..., the output of 10EA4 control LED unit 1, LED unit 2, the first current source and energy-storage units in LED unit 3
In the second current source current setting value it is incremented by successively.
When the rectified device 10BD of alternating current 10VAC generates electric current to LED unit 1 and the power supply of LED unit 2, control circuit control
The first current source in LED unit 1 processed disconnects；When the rectified device 10BD of alternating current 10VAC is to LED unit 1, LED unit 2 and LED
When the power supply of unit 3 generates electric current, control circuit controls the first current source in LED unit 1 and LED unit 2 and disconnects；Work as alternating current
When the rectified device 10BD of 10VAC generates electric current to the power supply of LED unit 1, LED unit 2, LED unit 3 and energy-storage units, control electricity
Road controls LED unit 1, LED unit 2, the first current source in LED unit 3 and disconnects.
The beneficial effect of the present embodiment is: the storage capacitor in energy-storage units assumes responsibility for the difference of line voltage and LED pressure drop
A part, change limitation of the traditional scheme to LED pressure drop, keep the selection of LED pressure drop more flexible；The energy of energy-storage units is released
The LED current deviation that can be changed in each LED unit is put, LED luminance consistency, which can get, to be improved.
The variation of embodiment two
Fig. 8 is energy release circuit figure in two variation of embodiment.
Embodiment is second is that with corresponding 3 LED units of an energy-storage units.
In this variation, an energy-storage units can correspond to any amount LED unit and be not limited to 3 quantity.Moreover,
It can repeat any group of energy-storage units are arranged and correspond to any amount LED unit, every group of corresponding quantity can not also be identical.
As shown in figure 8, energy release circuit passes through 4 with 4 groups of energy-storage units respectively and unidirectionally opens in this variation
Close corresponding any amount LED unit.Wherein unidirectionally opened for an energy-storage units by what two diodes 6D1,6D2 were constituted for two groups
Close corresponding 2 LED units, one group of single-way switch pair being made up of for an energy-storage units three diodes 6D1,6D2,6D3
3 LED units are answered, last group passes through the single-way switch that x diode 6D1,6D2 ... 6Dx is constituted for an energy-storage units
Corresponding X LED unit.
Embodiment three
Fig. 9 is the linear constant current driving circuit figure in embodiment three.
As shown in figure 9, linear constant current driving circuit includes: alternating current 11VAC, rectifier 11BD, one in the present embodiment
LED unit, three energy-storage units, energy release circuit and control circuit.
The input of rectifier 11BD is connected with alternating current 11VAC, and output includes anode and cathode.
Three energy-storage units are respectively energy-storage units 1, energy-storage units 2 and energy-storage units 3.
LED unit includes four terminals: input terminal I, output end O, control terminal C and ground terminal G, in three energy-storage units
Each includes four terminals: input terminal I, output end O, control terminal C and ground terminal G.
The anode of rectifier 11BD is connected with the input terminal I of LED unit, constitutes LED unit node, the output of LED unit
End O is connected with the input terminal I of energy-storage units 1, constitutes energy-storage units node 1, the output end O of energy-storage units 1 is connected to energy storage list
The input terminal I of member 2 constitutes energy-storage units node 2, the output end O of energy-storage units 2 is connected to the input terminal I of energy-storage units 3, structure
At energy-storage units node 3, the output end O of energy-storage units 3 is hanging.
The ground terminal G and the cathode of rectifier 11BD of the ground terminal G of LED unit and three energy-storage units link together.
Energy release circuit includes: a single-way switch.The single-way switch uses 3 diodes 11D1,11D2 and 11D3.
The anode of 3 diodes is respectively 3 anodes of single-way switch, and the cathode of 3 diodes links together, and constitutes this and unidirectionally opens
The cathode closed.
Energy release circuit also has 3 input terminals and 1 output end, and 3 anodes of single-way switch are 3 input terminals,
It is connected with 3 energy-storage units nodes；One cathode of single-way switch is output end, is connected with LED unit node.
The anode of diode 11D1,11D2 and 11D3 are connected respectively to energy storage list corresponding with energy release circuit input terminal
First node 1, energy-storage units node 2 and energy-storage units node 3, LED corresponding with energy release circuit output end after cathode is in parallel
Cell node is connected.
When the current potential of diode 11D1 anode is higher than the current potential of cathode, 11D1 conducting, by the energy storage electricity in energy-storage units 1
Hold energy to be discharged into LED unit；When the current potential of diode 11D2 anode is higher than the current potential of cathode, 11D2 conducting, by energy storage
Storage capacitor energy in unit 2 is discharged into LED unit；When the current potential of diode 11D3 anode is higher than the current potential of cathode,
11D3 conducting, the storage capacitor energy in energy-storage units 3 is discharged into LED unit.
Control circuit include error amplifier 11EA1,11EA2 ..., 11EA4, signal criterion 1, signal criterion 2 ...
Signal criterion 4, current-to-voltage convertor 11I/V.Wherein error amplifier 11EA1,11EA2 ..., the in-phase end of 11EA4 according to
It is secondary with signal criterion 1, signal criterion 2 ... signal criterion 4 is connected, and is connected to current-to-voltage convertor after reverse side is in parallel
The output end of 11I/V, the electric current of the rectified device 11BD of the input terminal detection stream of current-to-voltage convertor 11I/V.
Signal criterion 1, signal criterion 2 ... signal criterion 4 is incremented by successively, through error amplifier 11EA1,
11EA2 ..., the electricity of the output control LED unit of 11EA4, energy-storage units 1, energy-storage units 2, current source in energy-storage units 3
It is incremented by successively to flow setting value.
When the rectified device 11BD of alternating current 11VAC generates electric current to LED unit and the power supply of energy-storage units 1, control circuit control
The first current source in LED unit processed disconnects；When the rectified device 11BD of alternating current 11VAC is to LED unit, energy-storage units 1 and energy storage
When the power supply of unit 2 generates electric current, control circuit controls the second electric current in the first current source and energy-storage units 1 in LED unit
Source disconnects；It is produced when the rectified device 11BD of alternating current 11VAC powers to LED unit, energy-storage units 1, energy-storage units 2 and energy-storage units 3
When raw electric current, control circuit controls the second current source in the first current source, energy-storage units 1 and energy-storage units 2 in LED unit
It disconnects.
The beneficial effect of the present embodiment is: the storage capacitor in energy-storage units assumes responsibility for the difference of line voltage and LED pressure drop
A part, change limitation of the traditional scheme to LED pressure drop, keep the selection of LED pressure drop more flexible；LED unit only one,
The brightness of LED is consistent.
The variation of embodiment three
Figure 10 is energy release circuit figure in three variation of embodiment.
The energy release circuit of embodiment three is with the corresponding LED unit of three energy-storage units.
In this variation, energy release circuit arbitrarily energy-storage units one LED unit of correspondence can be not limited to 3 numbers
Amount.Moreover, it can repeat that any group of arbitrarily a corresponding LED unit of energy-storage units, every group of corresponding quantity is arranged
It can not be identical.
As shown in Figure 10, in this variation, there are energy release circuit 3 groups of arbitrarily a energy-storage units to pass through 3 lists respectively
A LED unit is corresponded to switching.Wherein pass through the single-way switch pair that a diode 7D1 is constituted for an energy-storage units for one group
Answer a LED unit, one group of single-way switch pair being made up of for 4 energy-storage units three diodes 7D1,7D2,7D3,7D4
A LED unit is answered, last group passes through the single-way switch that x diode 7D1,7D2 ... 7Dx is constituted for x energy-storage units
A corresponding LED unit.
Example IV
Figure 11 is the linear constant current driving circuit figure in example IV.
As shown in figure 11, in the present embodiment, linear constant current driving circuit includes: alternating current 12VAC, rectifier 12BD, three
LED unit, two energy-storage units, energy release circuit and control circuit.
The input of rectifier 12BD is connected with alternating current 12VAC, and output includes anode and cathode.
Three LED units are respectively LED unit 1, LED unit 2 and LED unit 3.
Two energy-storage units are respectively energy-storage units 1 and energy-storage units 2.
Each of three LED units include four terminals: input terminal I, output end O, control terminal C and ground terminal G, and two
Each of a energy-storage units include four terminals: input terminal I, output end O, control terminal C and ground terminal G.
Rectifier 12BD anode be connected with the input terminal I of LED unit 1, composition LED unit node 1, LED unit 1 it is defeated
Outlet O is connected with the input terminal I of LED unit 2, constitutes LED unit node 2, and the output end O of LED unit 2 is defeated with LED unit 3
Enter to hold I to be connected, constitute LED unit node 3, the output end O of LED unit 3 is connected with the input terminal I of energy-storage units 1, constitutes energy storage
Cell node 1, energy-storage units 1 output end O be connected to the input terminal I of energy-storage units 2, constitute energy-storage units node 2, energy storage list
The output end O of member 2 is hanging.
The cathode of the ground terminal G and rectifier 12BD of the ground terminal G and two energy-storage units of three LED units are connected to one
It rises.
Energy release circuit includes: the first single-way switch and the second single-way switch.
First single-way switch is made of 2 diodes 12D4 and 12D5, and the anode of 2 diodes is the first single-way switch
2 anodes, the cathode of 2 diodes link together constitute the first single-way switch a cathode.
Second single-way switch is made of 3 diodes 12D1,12D2 and 12D3, and the anode of 3 diodes links together
An anode of the second single-way switch is constituted, the cathode of 3 diodes is 3 cathodes of the second single-way switch.
Energy release circuit also has 2 input terminals and 3 output ends.
The anode of first single-way switch is respectively 2 input terminals of energy release circuit, defeated with 2 energy-storage units respectively
Enter I is held to connect.The cathode of first single-way switch is connect with the anode of the second single-way switch.The cathode of second single-way switch is respectively
3 output ends of energy release circuit, connect with the input terminal I of 3 LED units respectively.
When any in diode 12D1,12D2 and 12D3 anode potential is higher than cathode potential and diode 12D4
When being higher than cathode potential with a anode potential any in 12D5, corresponding diode current flow, by the energy storage electricity in energy-storage units
Hold energy to be discharged into LED unit.
Control circuit include error amplifier 12EA1,12EA2 ..., 12EA5, signal criterion 1, signal criterion 2 ...
Signal criterion 5, current-to-voltage convertor 12I/V.Wherein error amplifier 12EA1,12EA2 ..., the in-phase end of 12EA5 according to
It is secondary with signal criterion 1, signal criterion 2 ... signal criterion 5 is connected, and is connected to current-to-voltage convertor after reverse side is in parallel
The output end of 12I/V, the electric current of the rectified device 12BD of the input terminal detection stream of current-to-voltage convertor 12I/V.
Signal criterion 1, signal criterion 2 ... signal criterion 5 is incremented by successively, through error amplifier 12EA1,
12EA2 ..., in the output of 12EA5 control LED unit 1, LED unit 2, LED unit 3, energy-storage units 1, energy-storage units 2
The current setting value of current source is incremented by successively.
When the rectified device 12BD of alternating current 12VAC generates electric current to LED unit 1 and the power supply of LED unit 2, control circuit control
The first current source in LED unit 1 processed disconnects；When the rectified device 12BD of alternating current 12VAC is to LED unit 1, LED unit 2 and LED
When the power supply of unit 3 generates electric current, control circuit controls the first current source in LED unit 1 and LED unit 2 and disconnects；Work as alternating current
When the rectified device 12BD of 12VAC generates electric current to the power supply of LED unit 1, LED unit 2, LED unit 3 and energy-storage units 1, control electricity
Road controls the first current source in LED unit 1, LED unit 2 and LED unit 3 and disconnects；When the rectified device 12BD of alternating current 12VAC gives
When LED unit 1, LED unit 2, LED unit 3, energy-storage units 1 and the power supply of energy-storage units 2 generate electric current, control circuit controls LED
Unit 1, LED unit 2, the second current source in the first current source and energy-storage units 1 in LED unit 3 disconnect.
The beneficial effect of the present embodiment is: the storage capacitor in energy-storage units assumes responsibility for the difference of line voltage and LED pressure drop
A part, change limitation of the traditional scheme to LED pressure drop, keep the selection of LED pressure drop more flexible；The energy of energy-storage units is released
The LED current deviation that can be changed in each LED unit is put, LED luminance consistency, which can get, to be improved.
The variation of example IV
Figure 12 is energy release circuit figure in example IV variation.
The energy release circuit of example IV is with corresponding three LED units of two energy-storage units.
In this variation, energy release circuit arbitrarily can correspond to any LED unit by energy-storage units, moreover,
It can repeat that any group of arbitrarily a corresponding any LED unit of energy-storage units is arranged, every group of corresponding quantity can not also be identical.
As shown in figure 12, in this variation, there are energy release circuit 3 groups of different number energy-storage units to correspond to different number
LED unit.First group is that 2 energy-storage units are made up of the first single-way switch and 8DB1,8DB2 being made of 8DA1,8DA2
Second single-way switch corresponds to 2 LED units, second group be 3 energy-storage units by be made of 8DA1,8DA2,8DA3 first
Corresponding 2 LED units of the second single-way switch that single-way switch and 8DB1,8DB2 are constituted, third group be 2 energy-storage units by by
Corresponding 3 LED units of the second single-way switch that the first single-way switch and 8DB1,8DB2,8DB3 that 8DA1,8DA2 are constituted are constituted.
It, can be in addition, it is necessary to what is illustrated is the connection type in energy release circuit in above-mentioned four kinds of embodiments
It is applied in the same linear constant current driving circuit simultaneously.
The present invention program can be with flexible configuration LED unit and storage it can be seen from above-mentioned four kinds of embodiments and its variation
The quantity of energy unit, and the energy of the storage capacitor in energy-storage units can be discharged into LED unit with a variety of paths, be realized
The purpose of the present invention.
It should be noted that, in this document, the first and second equal relational terms be used merely to an entity or
Person's operation is distinguished with another entity or operation, is appointed without necessarily requiring or implying existing between these entities or operation
What this actual relationship or sequence；Word "a" or "an" before element be not excluded for multiple this elements presence, " if
Dry " or " multiple " be not excluded for the presence of a this element；Term " connected ", " connection ", " being connected to " or other variants,
Not only include being connected directly two entities, also includes being indirectly connected to connect by other entities with beneficial effect.
Above embodiments only describe the main feature and innovative point of this programme.Those skilled in the art it should be appreciated that
This programme is not restricted to the described embodiments.Under the premise of not departing from innovative point and protection scope of the present invention, this programme can also
There is various change, these changes and improvements are fallen in the claimed range of this programme.
Claims (9)
1. a kind of linear constant current driving circuit, it is characterised in that: including alternating current, rectifier, n LED unit, m energy-storage units,
Energy release circuit and control circuit；N and m is natural number；
The input of the rectifier is electrically connected with city, and output includes anode and cathode；
The n LED units all include four terminals: input, output end, control terminal and ground terminal；The m energy-storage units
It all include four terminals: input, output end, control terminal and ground terminal；
The input terminal of first LED unit is connected with the anode of the rectifier；
The output end of n-th of LED unit is connected with the input terminal of first energy-storage units；
In addition to the output end of n-th of LED unit, the input of the output end of the LED unit and the adjacent LED unit
End is connected；
Outside input terminal in addition to first energy-storage units, the input terminal of the energy-storage units and the adjacent energy-storage units
Output end is connected；
The ground terminal of a LED unit of n and the ground terminal of the m energy-storage units are connect with the cathode of the rectifier；
The control terminal of a LED unit of n and the control terminal of the m energy-storage units are connected to the control circuit；
The energy release circuit has m input terminal and k output end, and k is the natural number less than or equal to n, and the energy is released
The input terminal of the input terminal and m energy-storage units on electric discharge road is sequentially connected；The k output end is defeated with a LED unit of n
Enter some or all of end to be connected；
The energy release circuit includes at least one single-way switch, and the energy in m energy-storage units is discharged into and institute
It states in the connected LED unit of energy release circuit output end；
The n LED units all include LED, the first current source and the first blocking diode；
The anode of the LED is connected to the input terminal of the LED unit, the cathode of the LED and first blocking diode
Anode be connected, the cathode of first blocking diode is connected to the output end of the LED unit；
First current source includes two power ends and a signal end, one in described two power ends be connected to it is described
The anode of first blocking diode, another connects the ground terminal of the LED unit, and it is mono- that the signal end is connected to the LED
The control terminal of member；
The m energy-storage units all include storage capacitor, the second current source, the second blocking diode and discharge diode；
One end of the storage capacitor is connected to the input terminal of the energy-storage units, the other end and second blocking diode
Anode is connected；The cathode of second blocking diode is connected with the output end of the energy-storage units；
Second current source includes two power ends and a signal end, one in described two power ends be connected to it is described
The anode of second blocking diode, another connects the ground terminal of the energy-storage units, and the signal end is connected to the energy storage
The control terminal of unit, the anode of the discharge diode connect the ground terminal of the energy-storage units, and cathode is connected to described second
The anode of blocking diode.
2. linear constant current driving circuit according to claim 1, it is characterised in that:
The n LED unit be respectively LED unit 1, LED unit 2 ..., LED unit n, the m energy-storage units are respectively
Energy-storage units 1, energy-storage units 2 ..., energy-storage units m；
The input terminal of the LED unit 1 is connected with the anode of the rectifier, the output end and the LED of the LED unit 1
The input terminal of unit 2 is connected, the output end of the LED unit 2 is connected with the input terminal of the LED unit 3 ..., the LED
The output end of unit n is connected with the input terminal of the energy-storage units 1, the output end of the energy-storage units 1 and the energy-storage units 2
Input terminal be connected, the output end of the energy-storage units 2 is connected with the input terminal of the energy-storage units 3 ..., the energy storage list
The output end of first n is hanging.
3. linear constant current driving circuit according to claim 1, it is characterised in that:
Part or all of at least one single-way switch is at least one diode.
4. linear constant current driving circuit according to claim 1, it is characterised in that:
Any single-way switch has an anode and a cathode, and one of the anode and the energy release circuit
Input terminal is connected, and the cathode is connected with an output end of the energy release circuit.
5. linear constant current driving circuit according to claim 1, it is characterised in that:
Any single-way switch has an anode and several cathodes, and the anode of the single-way switch is connected to the energy
An input terminal of release circuit is measured, several cathodes are connected respectively to several output ends of the energy release circuit.
6. linear constant current driving circuit according to claim 1, it is characterised in that:
There are any single-way switch several anodes and a cathode, the anode of the single-way switch to be connected respectively to institute
Several input terminals of energy release circuit are stated, cathode is connected to an output end of the energy release circuit.
7. linear constant current driving circuit according to claim 1, it is characterised in that:
Any single-way switch is divided into the first single-way switch and the second single-way switch, and first single-way switch has several
A anode and a cathode, second single-way switch have several cathodes and an anode；
Several anodes of first single-way switch are connected respectively to the input terminal of energy release circuit；Described first unidirectionally opens
The cathode of pass is connected with the anode of second single-way switch；Several cathodes of second single-way switch are connected respectively to institute
State the output end of energy release circuit.
8. linear constant current driving circuit according to claim 1, it is characterised in that:
Control circuit includes that several error amplifiers turn with the one-to-one signal criterion of error amplifier and Current Voltage
Parallel operation；
The in-phase end of error amplifier is connected with signal criterion respectively, and reverse side is all connected to the output of current-to-voltage convertor
End, several output ends are connect with the control terminal of the control terminal of n LED unit, m energy-storage units respectively；Current Voltage conversion
The electric current of the rectified device of input terminal detection stream of device.
9. linear constant current driving circuit according to claim 1, it is characterised in that:
In the first current source, the 1st to m-th energy-storage units in the 1st to n-th LED unit of the control circuit control
The second current source current setting value it is incremented by successively.
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| CN201710405311.XA CN107454710B (en) | 2017-05-31 | 2017-05-31 | A kind of linear constant current driving circuit |
| PCT/CN2018/086015 WO2018219102A1 (en) | 2017-05-31 | 2018-05-08 | Linear constant-current driving circuit |
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| WO2009044114A1 (en) * | 2007-10-05 | 2009-04-09 | Cambridge Display Technology Limited | Dynamic adaptation of the power supply voltage for current-driven el displays |
| KR20140102966A (en) * | 2013-02-15 | 2014-08-25 | 한광희 | LED illumination device with energy conservation |
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| JP5693870B2 (en) * | 2010-04-13 | 2015-04-01 | ミネベア株式会社 | Switching power supply circuit |
| CN102711321B (en) * | 2012-05-04 | 2014-04-16 | 福建捷联电子有限公司 | Light emitting diode driving circuit |
| CN105813285A (en) * | 2014-12-31 | 2016-07-27 | 四川新力光源股份有限公司 | LED constant current driving device |
| CN104812118B (en) * | 2015-04-17 | 2017-03-01 | 华南理工大学 | A kind of LED illumination drive circuit of employing electric main and method |
| CN106413192B (en) * | 2016-10-25 | 2020-12-15 | 上海路傲电子科技有限公司 | Linear constant current driving circuit |
| CN107454710B (en) * | 2017-05-31 | 2019-01-18 | 上海路傲电子科技有限公司 | A kind of linear constant current driving circuit |
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|---|---|---|---|---|
| WO2009044114A1 (en) * | 2007-10-05 | 2009-04-09 | Cambridge Display Technology Limited | Dynamic adaptation of the power supply voltage for current-driven el displays |
| KR20140102966A (en) * | 2013-02-15 | 2014-08-25 | 한광희 | LED illumination device with energy conservation |
| KR20150010176A (en) * | 2013-07-18 | 2015-01-28 | 주식회사 루멘스 | LED illumination device involving flicker reducing circuit |
| KR20160144937A (en) * | 2016-07-07 | 2016-12-19 | 주식회사 르코어테크놀러지 | Driving Circuit For Light Emitting Diode |
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Denomination of invention: Linear constant current drive circuit Effective date of registration: 20190328 Granted publication date: 20190118 Pledgee: Anxin Agricultural Insurance Co., Ltd. Shanghai Minhang Branch Company Pledgor: SHANGHAI LUAO ELECTRONIC TECHNOLOGY CO., LTD. Registration number: 2019310000009 |
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Date of cancellation: 20200714 Granted publication date: 20190118 Pledgee: Anxin Agricultural Insurance Co., Ltd. Shanghai Minhang Branch Co. Pledgor: SHANGHAI LOOALL ELECTRONICS Co.,Ltd. Registration number: 2019310000009 |