CN105472809A - High-constant-current ultraviolet control circuit - Google Patents
High-constant-current ultraviolet control circuit Download PDFInfo
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- CN105472809A CN105472809A CN201510919503.3A CN201510919503A CN105472809A CN 105472809 A CN105472809 A CN 105472809A CN 201510919503 A CN201510919503 A CN 201510919503A CN 105472809 A CN105472809 A CN 105472809A
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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]
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Abstract
The invention relates to a high-constant-current ultraviolet control circuit. The control circuit comprises a power processing circuit, a constant-current controller, a driving circuit, a constant-current circuit and an LED load which are connected in sequence, wherein the input end of the constant-current circuit is further connected with the output ends of a sampling circuit and a direct-current driving power circuit; the output end of the sampling circuit is connected with the input end of the constant-current controller; the output end of the sampling circuit is connected with the input end of a PI regulating circuit; the output end of the PI regulating circuit is connected with the input end of the constant-current controller; and the constant-current circuit comprises a BUCK step-down topology circuit. According to the control circuit, high current of 25A can be stably output to reduce the current loss, and the driving circuit design is simplified to reduce the cost.
Description
Technical field
The present invention relates to a kind of big current constant current ultraviolet light control circuit.
Background technology
Comply with the trend of the whole world about energy-saving and emission-reduction, for the demand using the industries such as UV resin (ink, sticker, coating) to solidification, high energy consumption, the high pollution mode of traditional use mercury lamp solidification, more and more be not suitable with the trend of era development, be badly in need of a kind of cold light source of the energy-conserving and environment-protective for industrial trades such as electronics, spraying, printing and dyeing to replace traditional mercury lamp solidification.
LED is little with its volume, all solid state, the long-life, environmental protection, the series of advantages such as power saving, is used widely in each large field, becomes one of 21 century high-tech sector most with prospects.Numerous countries such as the U.S., European Union, Japan launch respectively plan, drop into huge fund and accelerate its development, to capture energy strategy commanding elevation.
Ultraviolet light polymerization irradiation apparatus employing LED is that the ultraviolet of light source irradiates UV resin (ink, sticker, coating), makes resin rapid curing, is usually used in the industrial trades such as electronics, spraying, printing and dyeing.Such as adopt this equipment to carry out cover to the UV resin spread upon on CD, MD, DVD player, lens, notebook computer liquid crystal panel etc. small (φ 2 ~ φ 3), accurate combination can be realized.
In ultraviolet light polymerization irradiation apparatus, the stable electric current exported is relatively little, causes the loss of electric current to increase, and drive circuit of the prior art design is complicated, and cost is higher.
Summary of the invention
The object of the invention is the defect overcoming prior art existence, provide a kind of and can stablize the big current exporting 25A, reduce the loss of electric current, simplify drive circuit design, cost-saving big current constant current ultraviolet light control circuit simultaneously.
The technical scheme realizing the object of the invention is: a kind of big current constant current ultraviolet light control circuit, has the power supply processing circuit, constant-current controller, drive circuit, constant-current circuit and the LED load that connect successively; The input of described constant-current circuit is also connected with the output of sample circuit, direct current driving power supply circuit; The output of described sample circuit is connected with the input of constant-current controller; The output of described sample circuit connects the input of PI regulating circuit; The described output of PI regulating circuit is connected with the input of constant-current controller; Described constant-current circuit comprises BUCK buck topology circuit.
Technique scheme also has soft starting circuit; The output of described soft starting circuit is connected with the input of constant-current controller.
Technique scheme also has protective circuit; The output of the input termination sample circuit of described protective circuit, the input of the output termination constant-current controller of protective circuit.
Described in technique scheme, BUCK buck topology circuit comprises big current metal-oxide-semiconductor Q2, diode D1 and Hall current sensor U5; Two ends difference earth connection after described big current metal-oxide-semiconductor Q2 is connected with diode D1 and the positive terminal of LED load; The IP-end of described Hall current sensor U5 is connected to the public connecting end of big current metal-oxide-semiconductor Q2 and diode D1 by inductance L 1.
PI regulating circuit described in technique scheme is made up of resistance R3, R4 of connecting successively and electric capacity C4, and the output of PI regulating circuit connects the input of the control chip of constant-current controller; The output of described Hall current sensor U5 is connected with the input of PI regulating circuit by amplifier Ud1A.
The input of the control chip of constant-current controller described in technique scheme is connected with RC oscillating circuit.
The control chip of constant-current controller described in technique scheme is SG3525 integrated chip.
The driving chip U4 of drive circuit described in technique scheme is TC1413N chip.
Described in technique scheme, big current metal-oxide-semiconductor Q2 is IPP023NE7N3G; Described diode D1 is STT6002CPI; Described Hall current sensor U5 is ACS712x30A.
After adopting technique scheme, the present invention has following positive effect:
(1) the present invention is mainly used in the driving of LED light source, the Constant Direct Current of maximum exportable 25A, reduces the loss of electric current, simplifies drive circuit design simultaneously, has saved cost.Adopt SG3525 integrated chip to be kernel control chip, PI regulating circuit, constant current main circuit changes flexibly primarily of BUCK buck topology circuit.
(2) the present invention adopts 30A Hall current sensor ACS712x30A directly can obtain a stable voltage signal to send in constant-current controller, constant-current circuit can be made like this to reach the output variable of 25A.
(3) driving chip in drive circuit of the present invention uses TC1413N chip, can improve the driving force of circuit, reach 3A.
(4) PI regulating circuit of the present invention can change the duty ratio of control PWM waveform, thus current constant output can be controlled, the control chip 14 pin 12 pin ground connection of constant-current controller, only do PWM output pin with 13 pin, duty ratio adjustable extent can be made like this to expand thus meet 0-25A Current adjustment.
Accompanying drawing explanation
In order to make content of the present invention more easily be clearly understood, below according to specific embodiment also by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is control section schematic diagram of the present invention;
Fig. 3 is the circuit diagram of BUCK buck topology circuit of the present invention;
Fig. 4 is the circuit of PI regulating circuit of the present invention;
Fig. 5 is drive circuit of the present invention;
Attached number in the figure is: power supply processing circuit 1, constant-current controller 2, drive circuit 3, constant-current circuit 4, LED load 5, sample circuit 6, direct current driving power supply circuit 7, PI regulating circuit 8, soft starting circuit 9, protective circuit 10.
Embodiment
(embodiment 1)
See Fig. 1 and Fig. 2, the big current constant current ultraviolet light control circuit of the present embodiment, has the power supply processing circuit 1, constant-current controller 2, drive circuit 3, constant-current circuit 4 and the LED load 5 that connect successively; The input of constant-current circuit 4 is also connected with the output of sample circuit 6, direct current driving power supply circuit 7; The output of sample circuit 6 is connected with the input of constant-current controller 2; The output of sample circuit 6 connects the input of PI regulating circuit 8; The output of PI regulating circuit 8 is connected with the input of constant-current controller 2; Constant-current circuit 4 comprises BUCK buck topology circuit.
Also there is soft starting circuit 9 and protective circuit 10; The output of soft starting circuit 9 is connected with the input of constant-current controller 2.
The output of the input termination sample circuit 6 of protective circuit 10, the input of the output termination constant-current controller 2 of protective circuit 10.
See Fig. 3, BUCK buck topology circuit comprises big current metal-oxide-semiconductor Q2, diode D1 and Hall current sensor U5; Two ends difference earth connection after big current metal-oxide-semiconductor Q2 is connected with diode D1 and the positive terminal of LED load; The IP-end of Hall current sensor U5 is connected to the public connecting end of big current metal-oxide-semiconductor Q2 and diode D1 by inductance L 1.Big current metal-oxide-semiconductor Q2 is IPP023NE7N3G; Diode D1 is STT6002CPI; Hall current sensor U5 is ACS712x30A.
See Fig. 4, PI regulating circuit 8 is made up of resistance R3, R4 of connecting successively and electric capacity C4, and the output of PI regulating circuit 8 connects the input of the control chip of constant-current controller 2; The output of Hall current sensor U5 is connected with the input of PI regulating circuit 8 by amplifier Ud1A.
The input of the control chip of constant-current controller 2 is connected with RC oscillating circuit.
The control chip of constant-current controller 2 is SG3525 integrated chip.
See Fig. 5, the driving chip U4 of drive circuit 3 is TC1413N chip.
Operation principle of the present invention is: sampled to loop current by Hall current sensor U5, current signal is converted to voltage signal, and this sampled value is delivered to amplifier Ud1A forward input pin, then arrives No. 1 pin of the control chip of constant-current controller 2.Here resistance R4, R3 and electric capacity C4 composition PI regulating circuit 8 send into control chip 9 pin, and it act as the duty ratio changing control PWM waveform, thus can control current constant output.Control chip 14 pin 12 pin ground connection, only do PWM output pin with 13 pin, duty ratio adjustable extent can be made like this to expand thus meet 0-25A Current adjustment.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a big current constant current ultraviolet light control circuit, has the power supply processing circuit (1), constant-current controller (2), drive circuit (3), constant-current circuit (4) and the LED load (5) that connect successively; The input of described constant-current circuit (4) is also connected with the output of sample circuit (6), direct current driving power supply circuit (7); The output of described sample circuit (6) is connected with the input of constant-current controller (2); It is characterized in that: the output of described sample circuit (6) connects the input of PI regulating circuit (8); The output of described PI regulating circuit (8) is connected with the input of constant-current controller (2); Described constant-current circuit (4) comprises BUCK buck topology circuit.
2. big current constant current ultraviolet light control circuit according to claim 1, is characterized in that: also have soft starting circuit (9); The output of described soft starting circuit (9) is connected with the input of constant-current controller (2).
3. big current constant current ultraviolet light control circuit according to claim 1 and 2, is characterized in that: also have protective circuit (10); The output of the input termination sample circuit (6) of described protective circuit (10), the input of the output termination constant-current controller (2) of protective circuit (10).
4. big current constant current ultraviolet light control circuit according to claim 3, is characterized in that: described BUCK buck topology circuit comprises big current metal-oxide-semiconductor Q2, diode D1 and Hall current sensor U5; Two ends difference earth connection after described big current metal-oxide-semiconductor Q2 is connected with diode D1 and the positive terminal of LED load; The IP-end of described Hall current sensor U5 is connected to the public connecting end of big current metal-oxide-semiconductor Q2 and diode D1 by inductance L 1.
5. big current constant current ultraviolet light control circuit according to claim 4, it is characterized in that: described PI regulating circuit (8) is made up of resistance R3, R4 of connecting successively and electric capacity C4, the output of PI regulating circuit (8) connects the input of the control chip of constant-current controller (2); The output of described Hall current sensor U5 is connected with the input of PI regulating circuit (8) by amplifier Ud1A.
6. big current constant current ultraviolet light control circuit according to claim 5, is characterized in that: the input of the control chip of described constant-current controller (2) is connected with RC oscillating circuit.
7. big current constant current ultraviolet light control circuit according to claim 6, is characterized in that: the control chip of described constant-current controller (2) is SG3525 integrated chip.
8. big current constant current ultraviolet light control circuit according to claim 7, is characterized in that: the driving chip U4 of described drive circuit (3) is TC1413N chip.
9. big current constant current ultraviolet light control circuit according to claim 8, is characterized in that: described big current metal-oxide-semiconductor Q2 is IPP023NE7N3G; Described diode D1 is STT6002CPI; Described Hall current sensor U5 is ACS712x30A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510919503.3A CN105472809B (en) | 2015-12-11 | 2015-12-11 | The ultraviolet light control circuit of high current constant current |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510919503.3A CN105472809B (en) | 2015-12-11 | 2015-12-11 | The ultraviolet light control circuit of high current constant current |
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| CN105472809A true CN105472809A (en) | 2016-04-06 |
| CN105472809B CN105472809B (en) | 2017-07-14 |
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2015
- 2015-12-11 CN CN201510919503.3A patent/CN105472809B/en active Active
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| CN105472809B (en) | 2017-07-14 |
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Inventor after: Jiang Wenxian Inventor after: Song Jinhua Inventor after: Gong Xiaoxiao Inventor before: Gong Xiaoxiao |
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