CN105916258A - Constant current power source capable of converting double LED path driving mode to single LED path driving mode - Google Patents
Constant current power source capable of converting double LED path driving mode to single LED path driving mode Download PDFInfo
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- CN105916258A CN105916258A CN201610447122.4A CN201610447122A CN105916258A CN 105916258 A CN105916258 A CN 105916258A CN 201610447122 A CN201610447122 A CN 201610447122A CN 105916258 A CN105916258 A CN 105916258A
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- resistance
- constant current
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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 a constant current power source capable of converting a double LED path driving mode to a single LED path driving mode. The constant current power source comprises a self-excited oscillation half-bridge circuit, and an output end of the self-excited oscillation half-bridge circuit is connected with two paths of LED lamps; a current sampling circuit, an amplification circuit, a logic identification circuit and a constant current conversion circuit are orderly connected in series between the output end of the self-excited oscillation half-bridge circuit and the LED lamps. The logic identification circuit in the constant current power source is capable of identifying whether currently double LED paths or a single LED path needs to be driven; when that one LED path is switched off is detected, a current is subjected to constant current conversion, and the LED lamps can be prevented from burnout.
Description
Technical field
The present invention relates to LED drive power field, particularly relate to a kind of two-way LED driving and be converted to what single LED drove
Constant current source.
Background technology
The advantages such as efficiency is high it is known that LED illumination has, life-span length and environmental protection, be considered most potential under
Generation lighting source, the market of LED commercial lighting in recent years is more that of obtaining development rapidly.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, the use of such as large supermarket
Family just proposes because of limited space, and two power supplys that two T8 lamps need not be conventional are powered, and power to two T8 lamps with a power supply,
It is known that LED constant current drives power drives two-way (two-way electric current is identical) LED, even without flow equalizing circuit two-way electric current
Also will not differ greatly, the requirement of user can be met.If but wherein there is a road to disconnect, disaster is just come, and LED constant current is driven
Galvanic electricity source has constant current function, and the originally electric current of two-way completely pours into this and comes, and this paths of LEDs lantern festival is burnt at once.
Summary of the invention
The present invention proposes a kind of two-way LED and drives the constant current source being converted to single LED driving, it is possible to judge it is currently one
Paths of LEDs work or two paths of LED work, change in time, prevent LED to be burned out.
The technical scheme is that and be achieved in that:
A kind of two-way LED drives and is converted to the constant current source that single LED drives, including self-oscillasion semi-bridge circuit, self-excitation
The outfan of oscillating half bridge circuit connects two paths of LED lamp, is provided with and depends between outfan and the LED of self-oscillasion semi-bridge circuit
The current sampling circuit of secondary series connection, amplifying circuit, logic 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 a certain paths of LEDs being detected
Lamp disconnects, then send sampled signal to amplifying circuit；
Amplifying circuit, amplifies after sampled signal and reference voltage, will amplify signal and send to logic identification circuit；
Logic identification circuit, for judging the ruuning situation of each paths of LEDs lamp, if all LED are all normal, then carries out
Fully loaded start, if there being a paths of LEDs lamp to disconnect, then implements start semi-load, if all LED all disconnect, then implements zero load start；
Constant current translation circuit, according to the logical judgment of logic identification circuit, it is achieved start semi-load or fully loaded start.
Further, current sampling circuit is by resistance R21, resistance R22, resistance R25, resistance R27, electric capacity C20 and electric capacity
C21 forms, resistance R21 and the common port of resistance R22 and secondary connect, and the other end of resistance R21 connects the second sampled point V2
With the negative pole of first via LED, the other end of resistance R22 connects the first sampled point V1 and the negative pole of the second paths of LEDs lamp, and first adopts
Sampling point V1 connects one end of resistance R25, and the second sampled point V2 connects one end of resistance R27, the other end of resistance R25 and electric capacity
C20 connects, and the secondary ground of another termination of electric capacity C20, the other end of resistance R27 is connected with one end of electric capacity C21, electric capacity C21's
The other end is connected with secondary.
Further, amplifying circuit is made up of operational amplifier 358, TL431, resistance R28, resistance R29 and resistance R30,
The common port of resistance R25 and electric capacity C20 is connected with the normal phase input end of operational amplifier 358, resistance R27 and the public affairs of electric capacity C21
End is connected with the inverting input of operational amplifier 358 altogether, and TL431, resistance R28, resistance R29 and resistance R30 are to operation amplifier
Device 358 transportation standard voltage.
Further, logic identification circuit is by diode D13, diode D14, diode D15, diode D16, resistance
R26 and photoelectrical coupler U2A composition, the positive pole of diode D13 is connected with the negative pole of diode D14, and its junction point is put with computing
The pin 7 of big device 358 is connected；The negative pole of diode D13 is connected with the negative pole of diode D15, its junction point and photoelectrical coupler
The pin A of U2A is connected；The positive pole of diode D15 is connected with the negative pole of diode D16, its junction point and operational amplifier 358
Output pin 1 connects；The positive pole of diode D14 and the positive pole of diode D16 connect, and its junction point connects with one end of resistance R26
Connecing, the other end of resistance R26 is connected with the pin K of photoelectrical coupler U2A.
Further, constant current change-over circuit is by photoelectrical coupler U2B, field effect transistor Q3, resistance R10, resistance R11, resistance
R12 and electric capacity C9 composition, the pin C of photoelectrical coupler U2B connects the grid of field effect transistor Q3, and one end of resistance R12 connects electricity
Source VDD, the other end is connected with the pin C of photoelectrical coupler U2B；Electric capacity C9 is connected in parallel on pin C and the pin of photoelectrical coupler U2B
E two ends；Field effect transistor Q3 and resistance R11 are in parallel with resistance R10 after connecting.
Further, field effect transistor Q3 is N-channel depletion type.
Further, if the pin 1 of operational amplifier 358 and pin 7 export high level or low level, photoelectric coupling simultaneously
The equal no current of device U2A passes through, and photoelectrical coupler U2B is in open-circuit condition, and field effect transistor Q3 is in opening state, and resistance R11 adds
Entering Constant flow sample load, constant current source is in fully loaded constant current state；If the arbitrary paths of LEDs lamp during two-way LED drives disconnects, then transport
Calculate pin 1 and the pin 7 of amplifier 358, one of them pin output high level, another pin output low level, light thermocouple
Clutch U2A has electric current to pass through, and photoelectrical coupler U2B is in the conduction state, and field effect transistor Q3 is off state, and resistance R11 breaks
Opening Constant flow sample load, constant current source is in constant current state semi-load.
The beneficial effects of the present invention is: logic identification circuit is capable of identify that and currently drives or single LED for two-way LED
Drive, if detecting that a paths of LEDs disconnects, then electric current is carried out constant current conversion, prevent LED to be burned out.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is that two-way LED of the present invention drives the circuit block diagram being converted to the constant current source that single LED drives；
Fig. 2 is that two-way LED of the present invention drives the circuit theory diagrams being converted to the constant current source that single LED drives.
In figure, 1-current sampling circuit；2-amplifying circuit；3-logic identification circuit；4-constant current translation circuit.
Detailed description of the invention
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
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
As depicted in figs. 1 and 2, the present invention proposes a kind of two-way LED and drives the Constant Electric Current being converted to single LED driving
Source, including self-oscillasion semi-bridge circuit, its topology is LLC resonant type soft-switch technology, and the outfan of self-oscillasion semi-bridge circuit is even
Be connected to two paths of LED lamp, be provided with between outfan and the LED of self-oscillasion semi-bridge circuit 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 a certain paths of LEDs being detected
Lamp disconnects, then send sampled signal to amplifying circuit；
Amplifying circuit 2, amplifies after sampled signal and reference voltage, will amplify signal and send to logic identification electricity
Road；
Logic identification circuit 3, for judging the ruuning situation of each paths of LEDs lamp, if all LED are all normal, then real
The fully loaded start of row, if there being a paths of LEDs lamp to disconnect, then implements start semi-load, if all LED all disconnect, then implements zero load and opens
Machine；
Constant current translation circuit 4, according to the logical judgment of logic identification circuit, it is achieved start semi-load or fully loaded start.
The constant current source that the present invention proposes, utilizing logic identification circuit 3 to identify is currently a paths of LEDs job or two
Paths of LEDs works, such as, when two paths of LED works, the electric current of every paths of LEDs is about 200mA, and the total current of two paths of LED is
400mA, if there being suddenly a paths of LEDs to disconnect, at this moment current sampling circuit 1, amplifying circuit 2, logic identification circuit 3, constant current conversion
Circuit 4, starts the continuous current that constant current is transformed at the electric current of 400mA 200mA at once successively, thus can protect LED
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 and the common port of resistance R22 and secondary connect, the other end of resistance R21 connects second sampled point V2 and the first via
The negative pole of LED, the other end of resistance R22 connects the first sampled point V1 and the negative pole of the second paths of LEDs lamp, and the first sampled point V1 is even
One end of connecting resistance R25, the second sampled point V2 connects one end of resistance R27, and the other end of resistance R25 is connected with electric capacity C20, electricity
The secondary ground of another termination of appearance C20, the other end of resistance R27 is connected with one end of electric capacity C21, and the other end of electric capacity C21 is with secondary
Level ground connects.Current sampling circuit is supervised in real time and is shown output size of current and change, a unexpected paths of LEDs in the operation of two paths of LED lamp
Lamp disconnects, and current sampling circuit is responsible for notifying next circuit.
Amplifying circuit 2 by operational amplifier 358, TL431, resistance R28, resistance R29 and resistance R30 composition, resistance R25 and
The common port of electric capacity C20 is connected with the normal phase input end of operational amplifier 358, resistance R27 and the common port of electric capacity C21 and computing
The inverting input of amplifier 358 connects, and TL431, resistance R28, resistance R29 and resistance R30 carry base to operational amplifier 358
Quasi-voltage.Amplify after the amplifying circuit mainly responsible signal current sampling circuit and reference voltage, be pushed to next stage
Circuit.
Logic identification circuit 3 is by diode D13, diode D14, diode D15, diode D16, resistance R26 and photoelectricity
Bonder U2A forms, and the positive pole of diode D13 is connected with the negative pole of diode D14, its junction point and operational amplifier 358
Pin 7 is connected；The negative pole of diode D13 is connected with the negative pole of diode D15, its junction point and the pin A of photoelectrical coupler U2A
It is connected；The positive pole of diode D15 is connected with the negative pole of diode D16, its junction point and the output pin 1 of operational amplifier 358
Connect；The positive pole of diode D14 and the positive pole of diode D16 connect, and its junction point is connected with one end of resistance R26, resistance R26
The other end be connected with the pin K of photoelectrical coupler U2A.Logic identification circuit has a series of logic identification: zero load is started shooting, partly
Carry start, fully loaded start.Such as two paths of LED lamp, no matter which road disconnects, and logic identification circuit will quickly identify, implements to open semi-load
Machine, two paths of LED lamp is all normal, will implement fully loaded start.Machine will not be can't afford to drive because of interference during unloaded start.
Constant current change-over circuit 4 is by photoelectrical coupler U2B, field effect transistor Q3, resistance R10, resistance R11, resistance R12 and electric capacity
C9 forms, and the pin C of photoelectrical coupler U2B connects the grid of field effect transistor Q3, and one end of resistance R12 connects power vd D, another
End is connected with the pin C of photoelectrical coupler U2B；Electric capacity C9 is connected in parallel on pin C and the pin E two ends of photoelectrical coupler U2B；Field effect
Should pipe Q3 and resistance R11 series connection after in parallel with resistance R10.
Field effect transistor Q3 is N-channel depletion type.
If the pin 1 of operational amplifier 358 and pin 7 export high level or low level, the equal nothing of photoelectrical coupler U2A simultaneously
Electric current passes through, and photoelectrical coupler U2B is in open-circuit condition, and field effect transistor Q3 is in opening state, and resistance R11 adds Constant flow sample
Load, constant current source is in fully loaded constant current state；If the arbitrary paths of LEDs lamp during two-way LED drives disconnects, then operational amplifier
The pin 1 of 358 and pin 7, one of them pin output high level, another pin output low level, photoelectrical coupler U2A has
Electric current passes through, and photoelectrical coupler U2B is in the conduction state, and field effect transistor Q3 is off state, and resistance R11 disconnects Constant flow sample
Load, constant current source is in constant current state semi-load.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (7)
1. two-way LED drives and is converted to the constant current source that single LED drives, including self-oscillasion semi-bridge circuit, its feature
It is: the outfan of described self-oscillasion semi-bridge circuit connects two paths of LED lamp, the outfan of described self-oscillasion semi-bridge circuit
And it is provided with current sampling circuit, amplifying circuit, logic identification circuit and the constant current conversion electricity being sequentially connected in series between described LED
Road；
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, amplifies after sampled signal and reference voltage, will amplify signal and send to logic identification circuit；
Logic identification circuit, for judging the ruuning situation of each paths of LEDs lamp, if all LED are all normal, then carries out fully loaded
Start, if there being a paths of LEDs lamp to disconnect, then implements start semi-load, if all LED all disconnect, then implements zero load start；
Constant current translation circuit, according to the logical judgment of logic identification circuit, it is achieved start semi-load or fully loaded start.
Two-way LED the most according to claim 1 drives and is converted to the constant current source that single LED drives, it is characterised in that: electricity
Stream sample circuit is made up of resistance R21, resistance R22, resistance R25, resistance R27, electric capacity C20 and electric capacity C21, resistance R21 and electricity
The common port of resistance R22 and secondary connect, the other end of resistance R21 connects the second sampled point V2 and the negative pole of first via LED,
The other end of resistance R22 connects the first sampled point V1 and the negative pole of the second paths of LEDs lamp, and the first sampled point V1 connects resistance R25's
One end, the second sampled point V2 connects one end of resistance R27, and the other end of resistance R25 is connected with electric capacity C20, another of electric capacity C20
The secondary ground of termination, the other end of resistance R27 is connected with one end of electric capacity C21, and the other end of electric capacity C21 is connected with secondary.
Two-way LED the most according to claim 2 drives and is converted to the constant current source that single LED drives, it is characterised in that: put
Big circuit is by operational amplifier 358, TL431, resistance R28, resistance R29 and resistance R30 composition, resistance R25 and the public affairs of electric capacity C20
End is connected with the normal phase input end of operational amplifier 358 altogether, the common port of resistance R27 and electric capacity C21 and operational amplifier 358
Inverting input connects, and TL431, resistance R28, resistance R29 and resistance R30 are to operational amplifier 358 transportation standard voltage.
Two-way LED the most according to claim 3 drives and is converted to the constant current source that single LED drives, it is characterised in that: patrol
Collect identification circuit by diode D13, diode D14, diode D15, diode D16, resistance R26 and photoelectrical coupler U2A group
Becoming, the positive pole of diode D13 is connected with the negative pole of diode D14, and its junction point is connected with the pin 7 of operational amplifier 358；Two
The negative pole of pole pipe D13 is connected with the negative pole of diode D15, and its junction point is connected with the pin A of photoelectrical coupler U2A；Diode
The positive pole of D15 is connected with the negative pole of diode D16, and its junction point is connected with the output pin 1 of operational amplifier 358；Diode
The positive pole of the positive pole of D14 and diode D16 connects, and its junction point is connected with one end of resistance R26, the other end of resistance R26 and
The pin K of photoelectrical coupler U2A connects.
Two-way LED the most according to claim 4 drives and is converted to the constant current source that single LED drives, it is characterised in that: permanent
Stream change-over circuit is by photoelectrical coupler U2B, field effect transistor Q3, resistance R10, resistance R11, resistance R12 and electric capacity C9 composition, photoelectricity
The pin C of bonder U2B connects the grid of field effect transistor Q3, and one end of resistance R12 connects power vd D, the other end and light thermocouple
The pin C of clutch U2B connects；Electric capacity C9 is connected in parallel on pin C and the pin E two ends of photoelectrical coupler U2B；Field effect transistor Q3 and electricity
Resistance R11 is in parallel with resistance R10 after connecting.
Two-way LED the most according to claim 5 drives and is converted to the constant current source that single LED drives, it is characterised in that: field
Effect pipe Q3 is N-channel depletion type.
Two-way LED the most according to claim 5 drives and is converted to the constant current source that single LED drives, it is characterised in that: if
The pin 1 of operational amplifier 358 and pin 7 export high level or low level simultaneously, and the equal no current of photoelectrical coupler U2A passes through,
Photoelectrical coupler U2B is in open-circuit condition, and field effect transistor 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 the arbitrary paths of LEDs lamp during two-way LED drives disconnects, then the pin 1 of operational amplifier 358
With pin 7, one of them pin output high level, another pin output low level, photoelectrical coupler U2A has electric current to pass through,
Photoelectrical coupler U2B is in the conduction state, and field effect transistor Q3 is off state, and resistance R11 disconnects Constant flow sample load, constant current
Power supply is in constant current state semi-load.
Priority Applications (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 |
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 true CN105916258A (en) | 2016-08-31 |
| CN105916258B CN105916258B (en) | 2018-02-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111555628A (en) * | 2020-05-13 | 2020-08-18 | 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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| CN105916258B (en) | 2018-02-16 |
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