CN202918541U - LED drive circuit compatible with fluorescent lamp ballast - Google Patents
LED drive circuit compatible with fluorescent lamp ballast Download PDFInfo
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- CN202918541U CN202918541U CN2012204876800U CN201220487680U CN202918541U CN 202918541 U CN202918541 U CN 202918541U CN 2012204876800 U CN2012204876800 U CN 2012204876800U CN 201220487680 U CN201220487680 U CN 201220487680U CN 202918541 U CN202918541 U CN 202918541U
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses an LED drive circuit compatible with a fluorescent lamp ballast. The LED drive circuit is compatible with a variety of ballasts, is compatible with the direct input of alternating current mains supply, realizes safe and reliable work, and has the outstanding advantages of good compatibility, high efficiency, high reliability, low cost and the like. The LED drive circuit comprises an LED, a first rectifier circuit, a second rectifier circuit, a pulse width modulation chip and a step-down converter. The positive poles of the output end of the first rectifier circuit and the output end of the second rectifier circuit are interconnected to be used as a working power supply positive pole, and the negative poles are interconnected to be used as power supply ground. A filter capacitor is connected between positive and negative poles. The input end of the first rectifier circuit is connected with a wiring end which is connected with one end of a fluorescent lamp tube. The input end of the second rectifier circuit is connected with a wiring end which is connected with the other end of the fluorescent lamp tube. The pulse width modulation chip is connected with the output ends of the rectifier circuits and the step-down converter respectively. The step-down converter is connected with the output ends of the rectifier circuits and the LED.
Description
Technical field
The utility model relates to a kind of power circuit, when relating in particular to a kind of use LED and replacing fluorescent lamp, and the power circuit of driving LED that can compatible ballast.
Background technology
The LED lamp be a kind ofly save that electric energy, optical efficiency are high, the light source of long service life and environmental protection, be the major product of replacing traditional fluorescent lamp.But in replacing the fluorescent tube process, the technical barrier that faces is compatible existing ballast how.Ballast such as fluorescent lamps such as T8, T5 is installed in the light fixture, is connected to by lead-in wire in the lamp socket of fluorescent tube.If directly replace fluorescent tube with corresponding LED fluorescent tube, just must possess the technical scheme of compatible existing ballast.
Open day be that on 06 01st, 2011, publication number are that the patent documentation of CN 201854483U discloses such technical scheme; a kind of LED lamp tube drive power; include overvoltage, current foldback circuit; rectification module; constant-current driven module etc., the civil power alternating current passes through pfc circuit and constant-current driven module driving LED fluorescent tube afterwards through connecing the input of rectification module after overvoltage, the overcurrent protection; can constant current in larger voltage range, prolonged the useful life of LED fluorescent tube.But the weak point of this technical scheme is the circuit structure of ac input circuit and can not for the connection of the daylight lamp holder with ballast, more can not be applied to the alternating current input mode of two fluorescent tubes.
Summary of the invention
Main purpose of the present utility model is to provide a kind of led drive circuit of compatible fluorescent lamp ballast, it can compatibility comprise single lamp, two lamp ballast, and starter formula ballast, start ballast soon, also can directly input by the compatible with alternating civil power simultaneously, realize safe and reliable work, it is compatible good to have, and efficient is high, reliability is high, the low outstanding advantages that waits of cost.
The utility model is mainly solved by following technical proposals for the prior art problem, a kind of led drive circuit of compatible fluorescent lamp ballast, comprise LED, the first rectification circuit, the second rectification circuit, pulse width modulating chip, decompression transducer, the first rectification circuit output end and the second rectification circuit output end positive interconnect are anodal as working power, negative interconnect is as power supply ground, just, connect a filter capacitor between negative pole, the input of the first rectification circuit is connected to the terminals that an end of fluorescent tube connects, the input of the second rectification circuit is connected to the terminals that the other end of fluorescent tube connects, pulse width modulating chip connects respectively output and the decompression transducer of rectification circuit, and decompression transducer connects rectification circuit output end and LED.
In this circuit, the first rectification circuit is transformed to direct current with the AC rectification that the circuit that the second rectification circuit will link to each other with the fluorescent tube two ends is exported, after filter capacitor filtering as the working power of pulse width modulating chip and buck (BUCK) converter, the electric current output of pulse width modulating chip control BUCK converter, make the BUCK converter export the DC power supply with voltage, Current Control, driving LED steady operation.
As preferably, decompression transducer comprises switching tube, current sampling resistor, inductor and fly-wheel diode, output, output stage that the control utmost point of switching tube connects pulse width modulating chip connect power supply ground, input the utmost point connects LED by inductor negative electrode by current sampling resistor, the anodic bonding working power of LED is anodal, the CS end of pulse width modulating chip connects current sampling resistor, and it is anodal that the end, the negative electrode that are connected with the switching tube input stage of the anodic bonding inductor of fly-wheel diode is connected working power.Wherein, fly-wheel diode closes to have no progeny at switching tube the electric energy in the inductor is added to LED; The electric current that pulse width modulating chip flows through by current sampling resistor control LED.
As preferably, the Voltage Feedback input of pulse width modulating chip is connected to the output of rectification circuit by resistor voltage divider circuit.Voltage Feedback input DIM at pulse width modulating chip connects bleeder circuit, with the output voltage of detection rectification circuit, and the one, carry out overvoltage protection, the 2nd, change partial pressure value realization dimming function by adjusting divider resistance.
As preferably, switching tube is MOSFET, and output, the source electrode that the grid of MOSFET connects pulse width modulating chip connects current sampling resistor, drain electrode connects inductor.Be beneficial to the BUCK converter is carried out higher switching frequency control and the wide region adjusting of electric current.
As preferably, rectification circuit is full bridge rectifier.To reduce the requirement of withstand voltage to rectifier diode.
The beneficial effect that the utility model brings is, can compatible existing single lamp, two lamp ballast, and starter formula ballast and the fast ballast that starts, also can directly input by the compatible with alternating civil power simultaneously, circuit safety is worked reliably after realizing replacing the LED lamp.This led drive circuit has simple circuit, and compatible good, efficient is high, and reliability is high, the low outstanding advantages that waits of cost.
Description of drawings
Fig. 1 is a kind of circuit theory diagrams of the present utility model;
Fig. 2 is the fast actuated type ballast internal wiring figure of 2 fluorescent lamps series connection;
Fig. 3 is the equivalent electric circuit that the utility model accesses the fast actuated type ballast of 2 fluorescent lamps series connection.
Among the figure: 1 is the first rectification circuit, and 2 is second rectification circuits, the 3rd, and decompression transducer.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is further described in detail.
Embodiment: as shown in Figure 1, the utility model is a kind of led drive circuit of compatible fluorescent lamp ballast.The output head anode of the output of the first rectification circuit 1 and the second rectification circuit 2 interconnects as working power positive pole, negative interconnect as power supply ground, between positive and negative electrode, connect filter capacitor C1, the input of the first rectification circuit 1 is connected to the terminals that an end of fluorescent tube connects, the input of the second rectification circuit 2 is connected to the terminals that the other end of fluorescent tube connects, the output of pulse width modulating chip U1 connects the switch controlled utmost point of decompression transducer 3, the electric current of decompression transducer 3 control LED.Wherein the first rectification circuit 1 and the second rectification circuit 2 are full bridge rectifiers, and decompression transducer comprises switching tube (MOSFET), current sampling resistor, inductor and fly-wheel diode.
Pin1, pin2, pin3, pin4 are 4 input terminations of LED fluorescent tube among the figure, Pin1, in2 are at one end, the rectifier bridge D1-D4 that connects the first rectification circuit 1, produce direct voltage and be added in the C1 two ends, pin3, pin4 are at the other end, the rectifier bridge D5-D8 that connects the second rectification circuit 2 produces direct voltage and also is added in the C1 two ends.Form a BUCK converter circuit by inductor L1, sustained diode 9, switching tube Q1, current sampling resistor R4.The grid of pulse width modulating chip U1 control switch pipe Q1 with the electric current that fixing switch periods and controlled Duty ratio control flow through switching tube Q1, is realized LED load steady operation.The DIM pin of pulse width modulating chip U1 has dimming function and over-voltage protecting function.The resistance R 1 of resistor voltage divider circuit, R2 are connected to filter capacitor C1 two ends as voltage sampling circuit, when in the effective dimming scope that minute is pressed in the DIM pin of resistance R 2, R1, and the variation of LED load current following sampling voltage and changing; When resistance R 2, when the dividing potential drop of R1 was lower than the lower limit reference value, output current was minimum value just; When resistance R 2, the dividing potential drop of R1 is during greater than upper limit reference value, and output current just reaches maximum.
The effect of the rectifier bridge D1-D4 of the first rectification circuit 1, the rectifier bridge D5-D8 of the second rectification circuit is the input rectifying of realizing pin1-pin2 or pin3-pin4, can block starter simultaneously and produce high pressure.When access band starter ballast, because the unilateral conduction of diode, so that starter is by diode-isolated, starter can not ionize, and has so just avoided producing high pressure in the LED lamp tube ends.
Figure 2 shows that the fast actuated type ballast internal wiring figure of 2 fluorescent lamps series connection, after fluorescent tube 1 and fluorescent tube 2 series connection, an end connects the A terminals, and the other end connects the C terminals, the middle B terminals that connect.
Figure 3 shows that the equivalent electric circuit after the utility model accesses the fast actuated type ballast of 2 fluorescent lamps series connection, load 1 and load 2 are led drive circuit of the present utility model (comprising LED).The A terminals produce voltage Vdc1 through rectification circuit, and the C terminals produce voltage Vdc2 through rectification circuit, and the B terminals are connected to the intermediate point of two led drive circuits (comprising LED), form floating potential VF.If do not add control, the VF current potential may be at Vdc1 to arbitrary value between the Vdc2, thereby causes normally steady operation of LED.And used DIM voltage detecting end owing to pulse width modulating chip U1 in the utility model, when voltage uprises, it is large that the DIM dividing potential drop becomes, so that the led drive circuit output current increases, the result is that the load of capacitor C a strengthens, so that capacitor C a lower voltage, thereby form negative feedback, realize the voltage stabilization of VF, namely realized the dynamic equilibrium of load 1 and load 2.
So the present invention has following characteristics: can compatible existing single lamp, two lamp ballast, and starter formula ballast and the fast ballast that starts, also can directly input by the compatible with alternating civil power simultaneously, circuit safety is worked reliably after realizing replacing the LED lamp, and have simple circuit, compatible good, efficient is high, reliability is high, the low outstanding advantages that waits of cost.
In the led drive circuit schematic diagram that the utility model proposes, the buck variator is the BUCK converter, also can be buck-boost circuit, flyback reverse excitation circuit etc., all in protection range of the present utility model.
Although this paper has more used the terms such as Buck circuit, rectification circuit, pulse width modulating chip, do not get rid of the possibility of using other term.Using these terms only is in order to describe more easily and explain essence of the present utility model; They are construed to any additional restriction all is contrary with the utility model spirit.
Only being preferred embodiment of the present utility model below, is not that the utility model is done any pro forma restriction.Any those of ordinary skill in the art, do not breaking away from the technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement that technical solution of the present invention is made many possible changes and modification, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not break away from technical solution of the present invention according to any simple modification, equivalent variations and the modification that technical spirit of the present utility model is done above embodiment, all still belongs in the scope of technical solution of the present invention protection.
Claims (5)
1. the led drive circuit of a compatible fluorescent lamp ballast, comprise LED, it is characterized in that: also comprise the first rectification circuit, the second rectification circuit, pulse width modulating chip, decompression transducer, described the first rectification circuit output end and the second rectification circuit output end positive interconnect are anodal as working power, negative interconnect is as power supply ground, just, connect a filter capacitor between negative pole, the input of the first rectification circuit is connected to the terminals that an end of fluorescent tube connects, the input of the second rectification circuit is connected to the terminals that the other end of fluorescent tube connects, pulse width modulating chip connects respectively output and the decompression transducer of described rectification circuit, and described decompression transducer connects described rectification circuit output end and LED.
2. the led drive circuit of described a kind of compatible fluorescent lamp ballast according to claim 1, it is characterized in that: described decompression transducer comprises switching tube, current sampling resistor, inductor and fly-wheel diode, the control utmost point of described switching tube connects the output of pulse width modulating chip, output stage adopts resistance to connect power supply ground by described electric current, the input utmost point connects the negative electrode of LED by described inductor, the anodic bonding working power of LED is anodal, the CS end of pulse width modulating chip connects current sampling resistor, an end that is connected with the switching tube input stage of the anodic bonding inductor of described fly-wheel diode, it is anodal that negative electrode connects working power.
3. the led drive circuit of described a kind of compatible fluorescent lamp ballast according to claim 1 and 2, it is characterized in that: the Voltage Feedback input of described pulse width modulating chip is connected to the output of described rectification circuit by resistor voltage divider circuit.
4. the led drive circuit of described a kind of compatible fluorescent lamp ballast according to claim 2, it is characterized in that: described switching tube is MOSFET, and output, the source electrode that the grid of described MOSFET connects pulse width modulating chip connects described current sampling resistor, drain electrode connects inductor.
5. the led drive circuit of described a kind of compatible fluorescent lamp ballast according to claim 1, it is characterized in that: described rectification circuit is full bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204876800U CN202918541U (en) | 2012-09-24 | 2012-09-24 | LED drive circuit compatible with fluorescent lamp ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204876800U CN202918541U (en) | 2012-09-24 | 2012-09-24 | LED drive circuit compatible with fluorescent lamp ballast |
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| Publication Number | Publication Date |
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| CN202918541U true CN202918541U (en) | 2013-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012204876800U Expired - Fee Related CN202918541U (en) | 2012-09-24 | 2012-09-24 | LED drive circuit compatible with fluorescent lamp ballast |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103796392A (en) * | 2014-02-12 | 2014-05-14 | 昱京科技股份有限公司 | LED lamp structure suitable for common fluorescent lamp |
| CN104582185A (en) * | 2015-01-13 | 2015-04-29 | 上海顿格电子贸易有限公司 | LED driving power supply circuit |
| CN104735873A (en) * | 2015-03-18 | 2015-06-24 | 深圳市锦兴流明科技有限公司 | Switching circuit and lamp compatible with fluorescent lamp ballast |
| CN105465642A (en) * | 2014-09-28 | 2016-04-06 | 嘉兴山蒲照明电器有限公司 | Light emitting diode lamp tube and emergency lamp device |
| CN107148113A (en) * | 2017-06-15 | 2017-09-08 | 佛山电器照明股份有限公司 | A kind of LED drive circuit for T-shaped fluorescent tube |
-
2012
- 2012-09-24 CN CN2012204876800U patent/CN202918541U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103796392A (en) * | 2014-02-12 | 2014-05-14 | 昱京科技股份有限公司 | LED lamp structure suitable for common fluorescent lamp |
| CN105465642A (en) * | 2014-09-28 | 2016-04-06 | 嘉兴山蒲照明电器有限公司 | Light emitting diode lamp tube and emergency lamp device |
| CN105465642B (en) * | 2014-09-28 | 2023-12-26 | 嘉兴山蒲照明电器有限公司 | LED lamp tube and emergency lighting lamp device |
| CN104582185A (en) * | 2015-01-13 | 2015-04-29 | 上海顿格电子贸易有限公司 | LED driving power supply circuit |
| CN104735873A (en) * | 2015-03-18 | 2015-06-24 | 深圳市锦兴流明科技有限公司 | Switching circuit and lamp compatible with fluorescent lamp ballast |
| CN104735873B (en) * | 2015-03-18 | 2017-08-18 | 深圳市锦兴流明科技有限公司 | A kind of change-over circuit and lamp of compatible fluorescent lamp ballast |
| CN107148113A (en) * | 2017-06-15 | 2017-09-08 | 佛山电器照明股份有限公司 | A kind of LED drive circuit for T-shaped fluorescent tube |
| CN107148113B (en) * | 2017-06-15 | 2019-04-26 | 佛山电器照明股份有限公司 | A kind of LED drive circuit for T-type fluorescent tube |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130501 Termination date: 20180924 |
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| CF01 | Termination of patent right due to non-payment of annual fee |