CN104540296A - Compatible LED intelligent fluorescent lamp tube and control method thereof - Google Patents
Compatible LED intelligent fluorescent lamp tube and control method thereof Download PDFInfo
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- CN104540296A CN104540296A CN201510007570.8A CN201510007570A CN104540296A CN 104540296 A CN104540296 A CN 104540296A CN 201510007570 A CN201510007570 A CN 201510007570A CN 104540296 A CN104540296 A CN 104540296A
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Abstract
The invention relates to a compatible LED intelligent fluorescent lamp tube and a control method thereof. The lamp tube comprises a fluorescent lamp tube body and a PCB arranged in the fluorescent lamp tube body. An LED lamp driving circuit is arranged on the PCB. The LED lamp driving circuit comprises a processing unit, a filtering module, a rectifier module, a current sampling module, a voltage sampling module, a constant current unit, a first LDO reference voltage module and a second LDO reference voltage module. The processing unit is connected with the current sampling module, the voltage sampling module and the first LDO reference voltage module. The PWM output end of the processing unit is connected to a load LED through a constant current chip and a constant current circuit. The constant current chip is connected to the second LDO reference voltage module. The ADC sampling end of the constant current chip is connected with the output end of the constant current circuit. The LED lamp driving circuit further comprises an alternating current input end connected to a ballast. The alternating current input end is connected with the processing unit through the rectifier module and the filtering module. The compatible LED intelligent fluorescent lamp tube can be directly applied in an original fluorescent lamp tube circuit, the circuit does not need to be changed, and the compatible LED intelligent fluorescent lamp tube can be used conveniently and reliably.
Description
Technical field
The present invention relates to field of LED drive, particularly a kind of Campatible LED intelligence fluorescent tube and control method thereof.
Background technology
The utilization rate of current conventional fluorescent fluorescent tube in commercial lighting market, North America is also very high, uses maximum lamps to be all fluorescent lamp in various place.Although fluorescent lamp is also energy-conservation, inside, but containing the heavy metal substance such as mercury, fluorescent material, is known from experience environment and people and is damaged.Due to current fluorescent tube, all with a kind of inductance or electric ballast, and the environmental protection of today, energy-conservation, long-life LED lamp tube is difficult to the fluorescent tube of these electronics completely compatible or Inductive ballast, therefore usually many times need carry out whole lamp replacing or carry out track remodelling between support and ballast, cost is higher.
The application for North America market put forth effort to research and develop a can the LED lamp pipe of directly compatible electronic ballast and inductance ballast, this compatible fluorescent lamp allows user without rewiring or changes original fluorescent lamp line construction, need the just operation as more changing the bulb done, whole process is very simple.The direct replacement of its applicable all fluorescent tube.
Summary of the invention
The object of the present invention is to provide a kind of directly can application on original fluorescent tube circuit without the need to doing circuit change, can use, convenient and reliable Campatible LED intelligence fluorescent tube and control method thereof.
For achieving the above object, technical scheme of the present invention is: a kind of Campatible LED intelligence fluorescent tube, comprise fluorescent tube and be arranged at the pcb board in described fluorescent tube, described pcb board is provided with LED lamp drive circuit, described LED lamp drive circuit comprises processing unit, filtration module, rectification module, for the current sample module of Gather and input current signal, for the voltage sample module of Gather and input voltage signal, constant current unit and the first to the 2nd LDO reference voltage module, the constant-current circuit that described constant current unit comprises constant current chip and is connected with the PWM output of this constant current chip, described processing unit and described current sample module, voltage sample module and a LDO reference voltage model calling, the PWM output of described processing unit is connected to load LED through described constant current chip, constant-current circuit, described constant current chip is connected to described 2nd LDO reference voltage module, the ADC sampling end of described constant current chip is also connected to the output of described constant-current circuit, the voltage exported with constant-current circuit of sampling and current signal, also comprise the ac input end being connected to ballast, described ac input end is connected with described processing unit through described rectification module, filtration module.
In embodiments of the present invention, described constant-current circuit comprises the first to the 14 resistance, first to the 7th electric capacity, first to the 5th diode, the first to the second triode, inductance and the first to the second metal-oxide-semiconductor, the vdd terminal of described constant current chip is connected to+5V power end, and be connected to ground through the first electric capacity, the GND end of described constant current chip is connected to ground, the ADC end of described constant current chip is through first, second resistance, first diode is connected to ground, the tie point of the ADC end of described constant current chip and the tie point of the first resistance and the first resistance and the second resistance is respectively through second, 3rd electric capacity is connected to ground, the tie point of described second resistance and the first diode is also connected to the source electrode of the first metal-oxide-semiconductor, three to five resistance of source electrode also through being connected in parallel of described first metal-oxide-semiconductor is connected to ground, the PWM end of described constant current chip is connected to the grid of described first metal-oxide-semiconductor through the 6th resistance, the drain electrode of described first metal-oxide-semiconductor is connected to the source electrode of the second metal-oxide-semiconductor, the grid of described second metal-oxide-semiconductor is connected to one end of the 7th resistance, the other end of described 7th resistance is connected to+12V power end, the negative pole end of the second diode and the emitter of the first triode, and be connected to ground through the 3rd diode and the 4th electric capacity respectively, the other end of described 7th resistance is also through the 8th resistance, the the 9th to the 11 resistance be connected in parallel is connected to and exchanges input positive pole, the collector electrode of described first triode is connected to the tie point of described 8th resistance and the 9th resistance, the base stage of described first triode is connected to through the 12 resistance and exchanges input positive pole, the base stage of described first triode is also connected to the collector electrode of described second triode, the emitter of described second triode is connected to ground, the base stage of described second triode is connected to ground through the 13 resistance and the 14 resistance be connected in parallel and the 5th electric capacity, the tie point of described 13 resistance and the 14 resistance is connected to the positive terminal of described second diode, the positive terminal of described second diode is also through the 4th diode, 6th, 7th electric capacity is connected to ground, the positive terminal of described 4th diode is also connected to ground through the 5th diode, described 6th, the tie point of the 7th electric capacity is also connected to ground through inductance.
In embodiments of the present invention, described constant current chip adopts Atmel-tiny13 chip.
In embodiments of the present invention, a described LDO reference voltage module adopts HT7550 chip.
In embodiments of the present invention, described 2nd LDO reference voltage module adopts HT7550 chip.
In embodiments of the present invention, described ballast is Inductive ballast or electric ballast.
Present invention also offers a kind of control method adopting Campatible LED intelligence fluorescent tube described above, comprise the steps,
Step S01: system power-on reset;
Step S02: judge that input ballast is electric ballast or Inductive ballast, namely by judging that input electrical signal frequency judges ballast types, if this ballast is electric ballast, then performs step S03; If this ballast is Inductive ballast, then jump to step S04;
Step S03: detect input voltage, current signal;
Step S04: according to input voltage, electric current, the PWM output frequency of adjustment processing unit and duty ratio, and then control output voltage;
Step S05: constant current unit, according to the output voltage of processing unit and LED power demand, adjusts output current further, supply LED, makes its steady operation.
Compared to prior art, the present invention has following beneficial effect: the present invention directly can apply without the need to doing circuit change on original fluorescent tube circuit, can use, convenient and reliable; And adopt control method of the present invention, the type identifying input ballast can be realized, thus control output voltage, electric current, reach LED fluorescent lamp tube stable power-supplying.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is constant current unit principle schematic of the present invention.
Fig. 3 is the control method flow chart of LED of the present invention intelligence fluorescent tube.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is specifically described.
As shown in Figure 1, a kind of Campatible LED intelligence of the present invention fluorescent tube, comprise fluorescent tube and be arranged at the pcb board in described fluorescent tube, described pcb board is provided with LED lamp drive circuit, described LED lamp drive circuit comprises processing unit, filtration module, rectification module, the current sample module for Gather and input current signal, the voltage sample module for Gather and input voltage signal, constant current unit and the first to the 2nd LDO reference voltage module, the constant-current circuit that described constant current unit comprises constant current chip and is connected with the PWM output of this constant current chip; Described processing unit and described current sample module, voltage sample module and a LDO reference voltage model calling, the PWM output of described processing unit is connected to load LED through described constant current chip, constant-current circuit, described constant current chip is connected to described 2nd LDO reference voltage module, the ADC sampling end of described constant current chip is also connected to the output of described constant-current circuit, the voltage exported with constant-current circuit of sampling and current signal; Also comprise the ac input end being connected to ballast, described ac input end is connected with described processing unit through described rectification module, filtration module.
As shown in Figure 2, described constant-current circuit comprises the first to the 14 resistance, first to the 7th electric capacity, first to the 5th diode, the first to the second triode, inductance and the first to the second metal-oxide-semiconductor, the vdd terminal of described constant current chip is connected to+5V power end, and be connected to ground through the first electric capacity, the GND end of described constant current chip is connected to ground, the ADC end of described constant current chip is through first, second resistance, first diode is connected to ground, the tie point of the ADC end of described constant current chip and the tie point of the first resistance and the first resistance and the second resistance is respectively through second, 3rd electric capacity is connected to ground, the tie point of described second resistance and the first diode is also connected to the source electrode of the first metal-oxide-semiconductor, three to five resistance of source electrode also through being connected in parallel of described first metal-oxide-semiconductor is connected to ground, the PWM end of described constant current chip is connected to the grid of described first metal-oxide-semiconductor through the 6th resistance, the drain electrode of described first metal-oxide-semiconductor is connected to the source electrode of the second metal-oxide-semiconductor, the grid of described second metal-oxide-semiconductor is connected to one end of the 7th resistance, the other end of described 7th resistance is connected to+12V power end, the negative pole end of the second diode and the emitter of the first triode, and be connected to ground through the 3rd diode and the 4th electric capacity respectively, the other end of described 7th resistance is also through the 8th resistance, the the 9th to the 11 resistance be connected in parallel is connected to and exchanges input positive pole, the collector electrode of described first triode is connected to the tie point of described 8th resistance and the 9th resistance, the base stage of described first triode is connected to through the 12 resistance and exchanges input positive pole, the base stage of described first triode is also connected to the collector electrode of described second triode, the emitter of described second triode is connected to ground, the base stage of described second triode is connected to ground through the 13 resistance and the 14 resistance be connected in parallel and the 5th electric capacity, the tie point of described 13 resistance and the 14 resistance is connected to the positive terminal of described second diode, the positive terminal of described second diode is also through the 4th diode, 6th, 7th electric capacity is connected to ground, the positive terminal of described 4th diode is also connected to ground through the 5th diode, described 6th, the tie point of the 7th electric capacity is also connected to ground through inductance.
Described constant current chip adopts Atmel-tiny13 chip.
First and second LDO reference voltage module described all adopts HT7550 chip.
In the present embodiment, described ballast is Inductive ballast or electric ballast.
Specific works principle of the present invention is as follows:
Due to the fluorescent lamp of different capacity, its voltage can from 400V-1000V not etc., wherein the output frequency of inductor rectifier is 50-60Hz, the ballast of electronics has 20K-60KHz not, so the change that LED drive power must bear high voltagehigh frequency could normally work, so we are according to this characteristic of ballast, adopt processing unit, identify different ballasts according to the different frequency of input.Front end adopts the rectification module of the composition of Schottky junction structure that the alternating voltage integer of the low of 50Hz-60KHz or high-frequency and high-voltage is become direct voltage, exported by processing unit control PWM and adjust output voltage, stable output voltage, the moment simultaneously controlling LED load connects, to utilize on ballast band after load, its output voltage can carry out constant current along with reduction, constant current is frequency and the duty ratio of carrying out adjusting output by the function of the PWM of constant flow module, by the gentle current balance type of voltage that exports on the LED of the various different capacities required for us, thus reach the object of the homeostasis of LED current.As long as electric current and voltage can be constant, the brightness of LED can be balanced, and its life-span just can be more permanent.Whole system band overload flow defencive function, when inputting or export overrate, system will automatically reset, and ensure that the reliability of product better.
As shown in Figure 3, present invention also offers a kind of control method adopting Campatible LED intelligence fluorescent tube described above, comprise the steps,
Step S01: system power-on reset;
Step S02: judge that input ballast is electric ballast or Inductive ballast, namely by judging that input electrical signal frequency judges ballast types, if this ballast is electric ballast, then performs step S03; If this ballast is Inductive ballast, then jump to step S04;
Step S03: detect input voltage, current signal;
Step S04: according to input voltage, electric current, the PWM output frequency of adjustment processing unit and duty ratio, and then control output voltage;
Step S05: constant current unit, according to the output voltage of processing unit and LED power demand, adjusts output current further, supply LED, makes its steady operation.
Be more than preferred embodiment of the present invention, all changes done according to technical solution of the present invention, when the function produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (7)
1. a Campatible LED intelligence fluorescent tube, comprise fluorescent tube and be arranged at the pcb board in described fluorescent tube, it is characterized in that: described pcb board is provided with LED lamp drive circuit, described LED lamp drive circuit comprises processing unit, filtration module, rectification module, the current sample module for Gather and input current signal, the voltage sample module for Gather and input voltage signal, constant current unit and the first to the 2nd LDO reference voltage module, the constant-current circuit that described constant current unit comprises constant current chip and is connected with the PWM output of this constant current chip; Described processing unit and described current sample module, voltage sample module and a LDO reference voltage model calling, the PWM output of described processing unit is connected to load LED through described constant current chip, constant-current circuit, described constant current chip is connected to described 2nd LDO reference voltage module, the ADC sampling end of described constant current chip is also connected to the output of described constant-current circuit, the voltage exported with constant-current circuit of sampling and current signal; Also comprise the ac input end being connected to ballast, described ac input end is connected with described processing unit through described rectification module, filtration module.
2. a kind of Campatible LED intelligence fluorescent tube according to claim 1, it is characterized in that: described constant-current circuit comprises the first to the 14 resistance, first to the 7th electric capacity, first to the 5th diode, the first to the second triode, inductance and the first to the second metal-oxide-semiconductor, the vdd terminal of described constant current chip is connected to+5V power end, and be connected to ground through the first electric capacity, the GND end of described constant current chip is connected to ground, the ADC end of described constant current chip is through first, second resistance, first diode is connected to ground, the tie point of the ADC end of described constant current chip and the tie point of the first resistance and the first resistance and the second resistance is respectively through second, 3rd electric capacity is connected to ground, the tie point of described second resistance and the first diode is also connected to the source electrode of the first metal-oxide-semiconductor, three to five resistance of source electrode also through being connected in parallel of described first metal-oxide-semiconductor is connected to ground, the PWM end of described constant current chip is connected to the grid of described first metal-oxide-semiconductor through the 6th resistance, the drain electrode of described first metal-oxide-semiconductor is connected to the source electrode of the second metal-oxide-semiconductor, the grid of described second metal-oxide-semiconductor is connected to one end of the 7th resistance, the other end of described 7th resistance is connected to+12V power end, the negative pole end of the second diode and the emitter of the first triode, and be connected to ground through the 3rd diode and the 4th electric capacity respectively, the other end of described 7th resistance is also through the 8th resistance, the the 9th to the 11 resistance be connected in parallel is connected to and exchanges input positive pole, the collector electrode of described first triode is connected to the tie point of described 8th resistance and the 9th resistance, the base stage of described first triode is connected to through the 12 resistance and exchanges input positive pole, the base stage of described first triode is also connected to the collector electrode of described second triode, the emitter of described second triode is connected to ground, the base stage of described second triode is connected to ground through the 13 resistance and the 14 resistance be connected in parallel and the 5th electric capacity, the tie point of described 13 resistance and the 14 resistance is connected to the positive terminal of described second diode, the positive terminal of described second diode is also through the 4th diode, 6th, 7th electric capacity is connected to ground, the positive terminal of described 4th diode is also connected to ground through the 5th diode, described 6th, the tie point of the 7th electric capacity is also connected to ground through inductance.
3. a kind of Campatible LED intelligence fluorescent tube according to claim 1 and 2, is characterized in that: described constant current chip adopts Atmel-tiny13 chip.
4. a kind of Campatible LED intelligence fluorescent tube according to claim 1, is characterized in that: a described LDO reference voltage module adopts HT7550 chip.
5. a kind of Campatible LED intelligence fluorescent tube according to claim 1, is characterized in that: described 2nd LDO reference voltage module adopts HT7550 chip.
6. a kind of Campatible LED intelligence fluorescent tube according to claim 1, is characterized in that: described ballast is Inductive ballast or electric ballast.
7. adopt a control method for Campatible LED according to claim 1 intelligence fluorescent tube, it is characterized in that: comprise the steps,
Step S01: system power-on reset;
Step S02: judge that input ballast is electric ballast or Inductive ballast, namely by judging that input electrical signal frequency judges ballast types, if this ballast is electric ballast, then performs step S03; If this ballast is Inductive ballast, then jump to step S04;
Step S03: detect input voltage, current signal;
Step S04: according to input voltage, electric current, the PWM output frequency of adjustment processing unit and duty ratio, and then control output voltage;
Step S05: constant current unit, according to the output voltage of processing unit and LED power demand, adjusts output current further, supply LED, makes its steady operation.
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| CN201510007570.8A CN104540296B (en) | 2015-01-08 | 2015-01-08 | Compatible LED intelligent fluorescent lamp tube and control method thereof |
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Cited By (2)
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| CN113453405A (en) * | 2021-07-16 | 2021-09-28 | 芯知微(上海)电子科技有限公司 | LED drive circuit and LED lamp |
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| CN104540296B (en) | 2017-01-11 |
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