CN105916258B - Two-way LED drivings are converted to the constant-current supply of single LED driving - Google Patents
Two-way LED drivings are converted to the constant-current supply of single LED driving Download PDFInfo
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- CN105916258B CN105916258B CN201610447122.4A CN201610447122A CN105916258B CN 105916258 B CN105916258 B CN 105916258B CN 201610447122 A CN201610447122 A CN 201610447122A CN 105916258 B CN105916258 B CN 105916258B
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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 invention discloses the constant-current supply that a kind of two-way LED drivings are converted to single LED driving, including self-oscillasion semi-bridge circuit, the output end of self-oscillasion semi-bridge circuit is connected with two paths of LED lamp, and current sampling circuit, amplifying circuit, logic identification circuit and the constant current translation circuit being sequentially connected in series are provided between the output end and LED of self-oscillasion semi-bridge circuit.The logic identification circuit of the present invention can be identified currently as two-way LED drivings or single LED driving, if detecting that a paths of LEDs disconnects, then carried out constant current conversion to electric current, prevented LED to be burned out.
Description
Technical field
The present invention relates to LED drive power field, particularly relates to a kind of two-way LED drivings and is converted to single LED driving
Constant-current supply.
Background technology
It is well known that LED illumination has efficiency high, long lifespan and the advantage such as green, under being considered as most potential
Generation lighting source, the market of LED commercial lightings in recent years are more that of obtaining rapid development.It is megastore, large supermarket, large-scale
Hotel, office building LED illumination lamp is a feast for the eyes, can be found everywhere, and user proposes many new requirements, such as the use of large supermarket
Family is just proposed because space is limited, and two T8 lamps do not have to conventional two power supplys power supply, is powered with a power supply to two T8 lamps,
It is well known that LED constant current driving power drives two-way (two-way electric current is identical) LED, even without flow equalizing circuit two-way electric current
Also it will not differ greatly, the requirement of user can be met.But disconnected all the way if wherein had, disaster is just come, and LED constant current is driven
Dynamic power supply has constant current function, and the originally electric current of two-way completely pours into this and come, and this paths of LEDs lantern festival is burnt at once.
The content of the invention
The present invention proposes that a kind of two-way LED drivings are converted to the constant-current supply of single LED driving, can interpolate that it is currently one
Paths of LEDs work or two paths of LED work, conversion, prevents LED to be burned out in time.
The technical proposal of the invention is realized in this way：
A kind of two-way LED drivings are converted to the constant-current supply of single LED driving, including self-oscillasion semi-bridge circuit, and it is opened up
Flutter and be connected with two paths of LED lamp for LLC resonant type soft-switches, the output end of self-oscillasion semi-bridge circuit, self-oscillasion semi-bridge circuit
The current sampling circuit being sequentially connected in series, amplifying circuit, logic identification circuit and constant current conversion electricity are provided between output end and LED
Road；
Current sampling circuit, for monitoring size of current and the change of each paths of LEDs lamp, if detecting a certain paths of LEDs
Lamp disconnects, then sends sampled signal to amplifying circuit；
Amplifying circuit, it will amplify after sampled signal and reference voltage, amplified signal sent to logic identification circuit；
Logic identification circuit, for judging the running situation of each paths of LEDs lamp, if all LEDs are normal, then carry out
Fully loaded start, if there is LED disconnection all the way, implement semi-load start, if all LEDs disconnect, then implement unloaded start；
Constant current translation circuit, according to the logic judgment of logic identification circuit, realize semi-load start or fully loaded start；
Current sampling circuit is made up of resistance R21, resistance R22, resistance R25, resistance R27, electric capacity C20 and electric capacity C21, electricity
Resistance R21 connects with resistance R22 common port with secondary ground, resistance R21 other end connection the second sampled point V2 and first via LED
The negative pole of lamp, the resistance R22 other end connect the negative pole of the first sampled point V1 and the second paths of LEDs lamp, the first sampled point V1 connections
Resistance R25 one end, the second sampled point V2 connection resistance R27 one end, the resistance R25 other end are connected with electric capacity C20, electric capacity
C20 another termination secondary ground, the resistance R27 other end are connected with electric capacity C21 one end, electric capacity the C21 other end and secondary
Ground connects；
Amplifying circuit is by operational amplifier 358, TL431, resistance R28, resistance R29 and resistance R30 compositions, resistance R25 and
Electric capacity C20 common port is connected with the normal phase input end of operational amplifier 358, resistance R27 and electric capacity C21 common port and computing
The inverting input connection of amplifier 358, TL431, resistance R28, resistance R29 and resistance R30 convey base to operational amplifier 358
Quasi- voltage.
Logic identification circuit is by diode D13, diode D14, diode D15, diode D16, resistance R26 and photoelectricity coupling
Clutch U2A is formed, and diode D13 positive pole is connected with diode D14 negative pole, and its tie point draws with operational amplifier 358
Pin 7 is connected；Diode D13 negative pole is connected with diode D15 negative pole, the pin A phases of its tie point and photoelectrical coupler U2A
Even；Diode D15 positive pole is connected with diode D16 negative pole, and the output pin 1 of its tie point and operational amplifier 358 connects
Connect；Diode D14 positive pole is connected with diode D16 positive pole, and its tie point is connected with resistance R26 one end, resistance R26's
The other end is connected with photoelectrical coupler U2A pin K.
Further, constant current change-over circuit is by photoelectrical coupler U2B, FET Q3, resistance R10, resistance R11, resistance
R12 and electric capacity C9 compositions, photoelectrical coupler U2B pin C connection FETs Q3 grid, resistance R12 one end connection electricity
Source VDD, the other end are connected with photoelectrical coupler U2B pin C；Electric capacity C9 is connected in parallel on photoelectrical coupler U2B pin C and pin
E both ends；It is in parallel with resistance R10 after FET Q3 and resistance R11 series connection.
Further, FET Q3 is N-channel depletion type.
Further, if the pin 1 and pin 7 of operational amplifier 358 export high level or low level, photoelectric coupling simultaneously
The equal no currents of device U2A are by the way that photoelectrical coupler U2B is in open-circuit condition, and FET Q3 is in opening state, and resistance R11 adds
Enter Constant flow sample load, constant-current supply is in fully loaded constant current state；If any paths of LEDs lamp in two-way LED drivings disconnects, transport
The pin 1 and pin 7 of amplifier 358 are calculated, one of pin exports high level, another pin output low level, photoelectricity coupling
Clutch U2A has electric current by the way that photoelectrical coupler U2B is in the conduction state, and FET Q3 is off state, and resistance R11 breaks
Constant flow sample load is opened, constant-current supply is in semi-load constant current state.
The beneficial effects of the present invention are：Logic identification circuit can be identified currently as two-way LED drivings or single LED
Driving, if detecting that a paths of LEDs disconnects, then constant current conversion is carried out to electric current, prevent LED to be burned out.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is the circuit block diagram for the constant-current supply that two-way LED of the present invention drivings are converted to single LED driving；
Fig. 2 is the circuit theory diagrams for the constant-current supply that two-way LED of the present invention drivings are converted to single LED driving.
In figure, 1- current sampling circuits；2- amplifying circuits；3- logic identification circuits；4- constant current translation circuits.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
As depicted in figs. 1 and 2, the present invention proposes the Constant Electric Current that a kind of two-way LED drivings are converted to single LED driving
Source, including self-oscillasion semi-bridge circuit, its topology are LLC resonant type soft-switch technologies, and the output end of self-oscillasion semi-bridge circuit connects
Be connected to two paths of LED lamp, between the output end and LED of self-oscillasion semi-bridge circuit be provided be sequentially connected in series current sampling circuit,
Amplifying circuit, logic identification circuit and constant current translation circuit；
Current sampling circuit 1, for monitoring size of current and the change of each paths of LEDs lamp, if detecting a certain paths of LEDs
Lamp disconnects, then sends sampled signal to amplifying circuit；
It amplifying circuit 2, will amplify after sampled signal and reference voltage, amplified signal sent to logic identification electricity
Road；
Logic identification circuit 3, it is if all LEDs are normal, then real for judging the running situation of each paths of LEDs lamp
The fully loaded start of row, if there is LED disconnection all the way, implements semi-load start, if all LEDs disconnect, then implements zero load and opens
Machine；
Constant current translation circuit 4, according to the logic judgment of logic identification circuit, realize semi-load start or fully loaded start.
Constant-current supply proposed by the present invention, it can identify it is currently LED operation or two all the way using logic identification circuit 3
Paths of LEDs works, for example, when two paths of LED works, the electric current per paths of LEDs is about 200mA, and the total current of two paths of LED is
400mA, if there is paths of LEDs disconnection suddenly, at this moment current sampling circuit 1, amplifying circuit 2, logic identification circuit 3, constant current conversion
Circuit 4, start the continuous current that constant current is transformed into 200mA at once in 400mA electric current successively, can thus protect LED
It will not burn.
Current sampling circuit 1 is made up of resistance R21, resistance R22, resistance R25, resistance R27, electric capacity C20 and electric capacity C21,
Resistance R21 connects with resistance R22 common port with secondary ground, and the resistance R21 other end connects the second sampled point V2 and the first via
The negative pole of LED, the resistance R22 other end connect the negative pole of the first sampled point V1 and the second paths of LEDs lamp, and the first sampled point V1 connects
Connecting resistance R25 one end, the second sampled point V2 connection resistance R27 one end, the resistance R25 other end are connected with electric capacity C20, electricity
Hold C20 another termination secondary ground, the resistance R27 other end be connected with electric capacity C21 one end, the electric capacity C21 other end and secondary
The connection of level ground.Prison shows output current size and change, a unexpected paths of LEDs in the operation of two paths of LED lamp to current sampling circuit in real time
Lamp disconnects, and current sampling circuit is responsible for notifying next circuit.
Amplifying circuit 2 is by operational amplifier 358, TL431, resistance R28, resistance R29 and resistance R30 compositions, resistance R25 and
Electric capacity C20 common port is connected with the normal phase input end of operational amplifier 358, resistance R27 and electric capacity C21 common port and computing
The inverting input connection of amplifier 358, TL431, resistance R28, resistance R29 and resistance R30 convey base to operational amplifier 358
Quasi- voltage.Amplifying circuit is mainly responsible for amplifying after the signal and reference voltage of current sampling circuit, is pushed to next stage
Circuit.
Logic identification circuit 3 is by diode D13, diode D14, diode D15, diode D16, resistance R26 and photoelectricity
Coupler U2A is formed, and diode D13 positive pole is connected with diode D14 negative pole, its tie point and operational amplifier 358
Pin 7 is connected；Diode D13 negative pole is connected with diode D15 negative pole, the pin A of its tie point and photoelectrical coupler U2A
It is connected；Diode D15 positive pole is connected with diode D16 negative pole, the output pin 1 of its tie point and operational amplifier 358
Connection；Diode D14 positive pole is connected with diode D16 positive pole, and its tie point is connected with resistance R26 one end, resistance R26
The other end be connected with photoelectrical coupler U2A pin K.Logic identification circuit has a series of logic identification：Zero load start, half
Carry start, fully loaded start.Such as two paths of LED lamp, no matter which road is disconnected, and logic identification circuit will be identified quickly, is implemented semi-load and is opened
Machine, two paths of LED lamp is all normal, to implement fully loaded start.Machine will not be can't afford to drive during zero load start because of interference.
Constant current change-over circuit 4 is by photoelectrical coupler U2B, FET Q3, resistance R10, resistance R11, resistance R12 and electric capacity
C9 is formed, photoelectrical coupler U2B pin C connection FETs Q3 grid, resistance R12 one end connection power vd D, another
End is connected with photoelectrical coupler U2B pin C；Electric capacity C9 is connected in parallel on photoelectrical coupler U2B pin C and pin E both ends；Field effect
Should pipe Q3 and resistance R11 series connection after it is in parallel with resistance R10.
FET Q3 is N-channel depletion type.
If the pin 1 and pin 7 of operational amplifier 358 export high level or low level, the equal nothings of photoelectrical coupler U2A simultaneously
Electric current is by the way that photoelectrical coupler U2B is in open-circuit condition, and FET Q3 is in opening state, and resistance R11 adds Constant flow sample
Load, constant-current supply are in fully loaded constant current state；If any paths of LEDs lamp in two-way LED drivings disconnects, operational amplifier
358 pin 1 and pin 7, one of pin export high level, another pin output low level, and photoelectrical coupler U2A has
Electric current is by the way that photoelectrical coupler U2B is in the conduction state, and FET Q3 is off state, and resistance R11 disconnects Constant flow sample
Load, constant-current supply are in semi-load constant current state.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (4)
1. a kind of two-way LED drivings are converted to the constant-current supply of single LED driving, including self-oscillasion semi-bridge circuit, its topology
For LLC resonant type soft-switches, it is characterised in that：The output end of the self-oscillasion semi-bridge circuit is connected with two paths of LED lamp, it is described from
The current sampling circuit being sequentially connected in series, amplifying circuit, logic are provided between the output end of oscillating half bridge circuit and the LED
Identification circuit and constant current translation circuit；
Current sampling circuit, for monitoring size of current and the change of each paths of LEDs lamp, if detecting that a certain paths of LEDs lamp breaks
Open, then send sampled signal to amplifying circuit；
Amplifying circuit, it will amplify after sampled signal and reference voltage, amplified signal sent to logic identification circuit；
Logic identification circuit, for judging the running situation of each paths of LEDs lamp, if all LEDs are normal, then carry out fully loaded
Start, if there is LED disconnection all the way, implement semi-load start, if all LEDs disconnect, then implement unloaded start；
Constant current translation circuit, according to the logic judgment of logic identification circuit, realize semi-load start or fully loaded start；
Current sampling circuit is made up of resistance R21, resistance R22, resistance R25, resistance R27, electric capacity C20 and electric capacity C21, resistance
R21 connects with resistance R22 common port with secondary ground, and the resistance R21 other end connects the second sampled point V2 and first via LED
Negative pole, the resistance R22 other end connects the negative pole of the first sampled point V1 and the second paths of LEDs lamp, and the first sampled point V1 connections are electric
R25 one end, the second sampled point V2 connection resistance R27 one end are hindered, the resistance R25 other end is connected with electric capacity C20, electric capacity
C20 another termination secondary ground, the resistance R27 other end are connected with electric capacity C21 one end, electric capacity the C21 other end and secondary
Ground connects；
Amplifying circuit is by operational amplifier 358, TL431, resistance R28, resistance R29 and resistance R30 compositions, resistance R25 and electric capacity
C20 common port is connected with the normal phase input end of operational amplifier 358, resistance R27 and electric capacity C21 common port and operation amplifier
The inverting input connection of device 358, TL431, resistance R28, resistance R29 and resistance R30 are electric to the transportation standard of operational amplifier 358
Pressure；
Logic identification circuit is by diode D13, diode D14, diode D15, diode D16, resistance R26 and photoelectrical coupler
U2A is formed, and diode D13 positive pole is connected with diode D14 negative pole, the phase of pin 7 of its tie point and operational amplifier 358
Even；Diode D13 negative pole is connected with diode D15 negative pole, and its tie point is connected with photoelectrical coupler U2A pin A；Two
Pole pipe D15 positive pole is connected with diode D16 negative pole, and its tie point is connected with the output pin 1 of operational amplifier 358；Two
Pole pipe D14 positive pole is connected with diode D16 positive pole, and its tie point is connected with resistance R26 one end, and resistance R26's is another
End is connected with photoelectrical coupler U2A pin K.
2. two-way LED drivings according to claim 1 are converted to the constant-current supply of single LED driving, it is characterised in that：It is permanent
Flow change-over circuit to be made up of photoelectrical coupler U2B, FET Q3, resistance R10, resistance R11, resistance R12 and electric capacity C9, photoelectricity
Coupler U2B pin C connection FETs Q3 grid, resistance R12 one end connection power vd D, the other end and photoelectricity coupling
Clutch U2B pin C connections；Electric capacity C9 is connected in parallel on photoelectrical coupler U2B pin C and pin E both ends；FET Q3 and electricity
Hinder in parallel with resistance R10 after R11 connects.
3. two-way LED drivings according to claim 2 are converted to the constant-current supply of single LED driving, it is characterised in that：
Effect pipe Q3 is N-channel depletion type.
4. two-way LED drivings according to claim 2 are converted to the constant-current supply of single LED driving, it is characterised in that：If
The pin 1 and pin 7 of operational amplifier 358 export high level or low level simultaneously, the equal no currents of photoelectrical coupler U2A by,
Photoelectrical coupler U2B is in open-circuit condition, and FET Q3 is in opening state, and resistance R11 adds Constant flow sample load, constant current
Power supply is in fully loaded constant current state；If any paths of LEDs lamp in two-way LED drivings disconnects, the pin 1 of operational amplifier 358
With pin 7, one of pin exports high level, another pin output low level, photoelectrical coupler U2A have electric current by,
Photoelectrical coupler U2B is in the conduction state, and FET Q3 is off state, and resistance R11 disconnects Constant flow sample load, constant current
Power supply is in semi-load constant current state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610447122.4A CN105916258B (en) | 2016-06-16 | 2016-06-16 | Two-way LED drivings are converted to the constant-current supply of single LED driving |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610447122.4A CN105916258B (en) | 2016-06-16 | 2016-06-16 | Two-way LED drivings are converted to the constant-current supply of single LED driving |
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| CN105916258A CN105916258A (en) | 2016-08-31 |
| CN105916258B true CN105916258B (en) | 2018-02-16 |
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| CN111555628B (en) * | 2020-05-13 | 2023-08-29 | 西安矽力杰半导体技术有限公司 | Circuit topology identification circuit and identification method |
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| CN202261912U (en) * | 2011-06-29 | 2012-05-30 | 上海登芯微电子科技有限公司 | LED drive power supply with multi-way constant-current output |
| CN104039039A (en) * | 2014-05-23 | 2014-09-10 | 中国科学院广州能源研究所 | Two-way output constant current LED (Light-Emitting Diode) driving circuit |
| CN104202882A (en) * | 2014-09-12 | 2014-12-10 | 广东良得光电科技有限公司 | High-efficiency low-power-consumption low-power non-isolated LED drive circuit |
| CN205830091U (en) * | 2016-06-16 | 2016-12-21 | 广东科谷电源股份有限公司 | Two-way LED drives and is converted to the constant current source that single LED drives |
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| CN102548100B (en) * | 2010-12-27 | 2014-01-15 | 英飞特电子（杭州）股份有限公司 | Load driving device and system |
| CN103096561B (en) * | 2011-10-31 | 2015-06-10 | 英飞特电子（杭州）股份有限公司 | Constant current driver of light emitting diode (LED) light source |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202261912U (en) * | 2011-06-29 | 2012-05-30 | 上海登芯微电子科技有限公司 | LED drive power supply with multi-way constant-current output |
| CN104039039A (en) * | 2014-05-23 | 2014-09-10 | 中国科学院广州能源研究所 | Two-way output constant current LED (Light-Emitting Diode) driving circuit |
| CN104202882A (en) * | 2014-09-12 | 2014-12-10 | 广东良得光电科技有限公司 | High-efficiency low-power-consumption low-power non-isolated LED drive circuit |
| CN205830091U (en) * | 2016-06-16 | 2016-12-21 | 广东科谷电源股份有限公司 | Two-way LED drives and is converted to the constant current source that single LED drives |
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