CN211406378U - High-power LED lamp drive circuit for movie and television - Google Patents
High-power LED lamp drive circuit for movie and television Download PDFInfo
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- CN211406378U CN211406378U CN202020161259.5U CN202020161259U CN211406378U CN 211406378 U CN211406378 U CN 211406378U CN 202020161259 U CN202020161259 U CN 202020161259U CN 211406378 U CN211406378 U CN 211406378U
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Abstract
A high-power LED lamp driving circuit for film and television comprises an LED lamp, a power circuit, a main control unit for sending a driving signal and an execution unit for controlling the LED lamp to work according to the driving signal, wherein the execution unit comprises a driving chip, a voltage following circuit and a sampling circuit, and the sampling circuit comprises a first current sampling circuit and a second current sampling circuit; one end of the first current sampling circuit is connected with the LED lamp, and the other end of the first current sampling circuit is connected with the reverse end of the voltage follower circuit; the second current sampling circuit is used for collecting the current at the output end of the voltage follower circuit, one end of the second sampling current circuit is connected with the output end of the voltage follower circuit, and the other end of the second sampling current circuit is connected with the driving chip; the driving chip is connected with the power supply circuit and the LED lamp through the first current sampling circuit to form a loop. The utility model discloses be provided with driver chip and sampling circuit, thereby adjust driver chip output voltage through sampling signal and optimize PWM signal and realize that the LED lamp steadily adjusts.
Description
Technical Field
The utility model relates to a movie & TV equipment field, concretely relates to movie & TV is with high-power LED lamp drive circuit.
Background
The LED driving power circuit for the video equipment in the market generally adopts a light-dimming platform of a DMX512 light-dimming protocol to communicate with Microcontrollers (MCUs) such as a single chip microcomputer in the power supply, then converts received digital signals into PWM signals through the MCU, adjusts the power of an LED lamp by adjusting the duty ratio, and realizes the brightness adjustment of the LED lamp.
However, the above method has the following disadvantages in practical use: firstly, due to chopping adjustment of PWM, ripple waves are generated on the output of a driving power supply, and the current for driving the LED lamp is unstable, so that the LED lamp has a stroboscopic phenomenon; secondly, due to the inherent characteristic of the adjusting mode, the power supply can generate power supply noise, and the noise can be applied to occasions with low requirements; but cannot meet the situation where strict requirements are placed on sound.
Disclosure of Invention
The utility model discloses a solve current LED lamp drive when carrying out adjustting of lighteness through PWM because signal conditioning is not smooth enough and leads to the LED lamp stroboflash to appear and have the problem of electric current interference noise along with, provide a high-power LED lamp drive circuit for movie & TV, be provided with driver chip and sampling circuit, thereby adjust driver chip output voltage through sampling signal and optimize PWM signal and realize the steady regulation of LED lamp.
In order to realize the purpose, the technical scheme of the utility model is that:
a high-power LED lamp driving circuit for film and television comprises an LED lamp, a power circuit, a main control unit for sending a driving signal and an execution unit for controlling the LED lamp to work according to the driving signal,
the execution unit comprises a driving chip, a voltage follower circuit and a sampling circuit, wherein the sampling circuit comprises a first current sampling circuit and a second current sampling circuit; wherein:
the first current sampling circuit is used for collecting current at the LED lamp, one end of the first current sampling circuit is connected with the LED lamp, and the other end of the first current sampling circuit is connected with the reverse end of the voltage following circuit;
the second current sampling circuit is used for collecting the current at the output end of the voltage follower circuit, one end of the second current sampling circuit is connected with the output end of the voltage follower circuit, and the other end of the second current sampling circuit is connected with the driving chip;
the driving chip is connected with the power supply circuit and the LED lamp through the first current sampling circuit to form a loop.
Further, the first current sampling circuit comprises a first resistor and an inductor, and the first resistor is connected with the inductor in series; the drive chip adopts an MP4000 chip, and a first MOS tube is connected between a DRV pin of the MP4000 chip and the inductor.
Further, the second current sampling circuit comprises a second resistor and a second MOS (metal oxide semiconductor) tube, a CS (circuit switch) pin of the MP4000 chip is connected with a D level of the second MOS tube, a first optical coupler is connected between a G level of the second MOS tube and a voltage following circuit, a pin 1 of the first optical coupler is connected with an output end of the voltage following circuit, a pin 2 is grounded, a pin 3 is connected with the G level of the second MOS tube, an S level of the second MOS tube is connected with one end of the second resistor, and the other end of the second resistor is connected with the S level of the first MOS tube.
Further, the main control unit comprises an MCU chip and a second optical coupler, the MCU chip is used for outputting PWM driving signals, an IO port of the MCU chip is connected with a pin 1 of the second optical coupler, and a pin 3 of the second optical coupler is connected with a non-inverting terminal of the voltage following circuit.
Further, the power supply circuit comprises a power supply and a rectifying circuit, the rectifying circuit comprises an alternating current rectifying circuit and an AC/DC converting circuit, the alternating current rectifying circuit comprises a rectifying bridge, the power supply is connected with the AC/DC converting circuit through the rectifying bridge, and the AC/DC converting circuit is used for supplying power to the main control unit.
Through the technical scheme, the beneficial effects of the utility model are that:
the utility model is provided with a driving chip, a voltage following circuit and a sampling circuit, wherein the sampling circuit comprises a first current sampling circuit and a second current sampling circuit; the first current sampling circuit is used for collecting current at the LED lamp, one end of the first current sampling circuit is connected with the LED lamp, and the other end of the first current sampling circuit is connected with the reverse end of the voltage following circuit; the second current sampling circuit is used for collecting the current at the output end of the voltage follower circuit, one end of the second current sampling circuit is connected with the output end of the voltage follower circuit, and the other end of the second current sampling circuit is connected with the driving chip; the driving chip is connected with the power supply circuit and the LED lamp through the first current sampling circuit to form a loop. After electrification, the main control unit sends out PWM signals, the in-phase end of the voltage follower circuit receives the PWM signals and generates changed voltage output, the first current sampling circuit and the second current sampling circuit work, the second current sampling circuit provides a variable sampling resistor for the driving chip, the driving chip adjusts the LED lamp according to the output voltage of the second current sampling circuit, and meanwhile, the first current sampling circuit inputs the sampling current at the LED lamp to the reverse end of the voltage follower circuit. Therefore, the LED lamp is indirectly adjusted, and the problems of stroboflash and noise generated by directly adjusting the LED lamp through the driving chip by the main control unit are solved.
Drawings
Fig. 1 is an electrical schematic diagram of the high-power LED lamp driving circuit for film and television of the present invention.
The reference numbers in the figures are: 1 is the driver chip, 3 is the voltage follower circuit, 4 is first current sampling circuit, 5 is the second current sampling circuit, 6 is the MCU chip.
Detailed Description
The invention will be further explained with reference to the drawings and the detailed description below:
as shown in FIG. 1, a high-power LED lamp driving circuit for film and television comprises an LED lamp, a power circuit, a main control unit for sending a driving signal and an execution unit for controlling the LED lamp to work according to the driving signal,
the execution unit comprises a driving chip 1, a voltage follower circuit 3 and a sampling circuit, wherein the sampling circuit comprises a first current sampling circuit 4 and a second current sampling circuit 5; wherein:
the first current sampling circuit 4 is used for collecting current at the LED lamp, one end of the first current sampling circuit 4 is connected with the LED lamp, and the other end of the first current sampling circuit 4 is connected with the reverse end of the voltage following circuit 3;
the second current sampling circuit 5 is used for collecting the current at the output end of the voltage follower circuit 3, one end of the second current sampling circuit 5 is connected with the output end of the voltage follower circuit 3, and the other end of the second current sampling circuit 5 is connected with the driving chip 1;
the driving chip 1 is connected with a power supply circuit and the LED lamp through a first current sampling circuit 4 to form a loop.
In order to optimize the product structure and improve the adjustment effect, the first current sampling circuit 4 comprises a first resistor and an inductor, and the first resistor is connected with the inductor in series; the drive chip 1 adopts an MP4000 chip, and a first MOS tube is connected between a DRV pin of the MP4000 chip and the inductor.
For making the CS pin input signal work of driver chip 1, second current sampling circuit 5 includes second resistance and second MOS pipe, the D level of second MOS pipe is connected to the CS pin of MP4000 chip, be connected with first opto-coupler between the G utmost point of second MOS pipe and the voltage follower circuit 3, pin 1 and the output of voltage follower circuit 3 of first opto-coupler are connected, and pin 2 ground connection, pin 3 connect the G utmost point of second MOS pipe, and the S utmost point of second MOS pipe connects the one end of second resistance, and the other end of second resistance is connected with the S utmost point of first MOS pipe.
For optimizing product structure, the main control unit includes MCU chip 6 and second opto-coupler, MCU chip 6 is used for exporting PWM drive signal, and MCU chip 6's IO mouth is connected with pin 1 of second opto-coupler, and the pin 3 of second opto-coupler is connected voltage follower circuit 3's homophase end.
In order to simplify the circuit structure, the power supply circuit comprises a power supply and a rectifying circuit, the rectifying circuit comprises an alternating current rectifying circuit and an AC/DC conversion circuit, the alternating current rectifying circuit comprises a rectifying bridge, the power supply is connected with the AC/DC conversion circuit through the rectifying bridge, and the AC/DC conversion circuit is used for supplying power to the main control unit.
In this embodiment, as shown in fig. 1, an electrical reference number of the first resistor is R611, an electrical reference number of the inductor is L304, an electrical reference number of the first MOS transistor is Q302, an electrical reference number of the second resistor is R307, an electrical reference number of the second MOS transistor is Q601, an electrical reference number of the first optical coupler is U01, and an electrical reference number of the second optical coupler is U02. The MCU chip 6 adopts STM32 series single-chip microcomputer, the PA4 pin of single-chip microcomputer outputs PWM signal, the PA4 pin is connected with pin 1 of opto-coupler.
When the brightness of the LED lamp is adjusted, the MCU chip 6 receives an external communication signal to output a PWM signal, when the PWM signal is at a high level, the second optical coupler U02 is switched on, a pin 3 of the second optical coupler U02 outputs a signal to a non-inverting terminal of the voltage follower circuit 3, at the moment, an operational amplifier of the voltage follower circuit 3 compares the signal at the non-inverting terminal with a signal at a reverse terminal connected to the first current sampling circuit 4 to output a control signal, when the control signal is at the high level, the first optical coupler U01 between the voltage follower circuit 3 and the second current sampling circuit 5 is switched on, according to the characteristics of an MOS transistor, a G transistor pole of the second MOS transistor Q601 can adjust the self on-resistance according to a corresponding changed voltage provided by the first optical coupler U01, and a second resistor R307 which is connected in series is added to provide a variable sampling signal for the driving chip 1; after a CS pin of the driving chip 1 inputs a signal, a DRV pin outputs a voltage to drive the LED lamp to adjust. Therefore, the LED lamp driving function of adjustable current output is realized, and meanwhile, power supply interference noise is avoided.
In the driving process, the DIM pin of the driving chip 1 is suspended, and although the current output by the driving chip 1 in the LED adjusting process changes, compared with a method that a main control unit is directly connected with the DIM pin of the driving chip 1 to perform PWM modulation, the driving chip 1 always works in the maximum output current state, so that the problem of LED lamp stroboscopic caused by PWM signal fluctuation can be avoided.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, so that equivalent changes and modifications made by the structure, features and principles of the invention should be included in the claims of the present invention.
Claims (5)
1. A high-power LED lamp driving circuit for film and television comprises an LED lamp, a power circuit, a main control unit for sending a driving signal and an execution unit for controlling the LED lamp to work according to the driving signal, and is characterized in that,
the execution unit comprises a driving chip (1), a voltage follower circuit (3) and a sampling circuit, wherein the sampling circuit comprises a first current sampling circuit (4) and a second current sampling circuit (5); wherein:
the first current sampling circuit (4) is used for collecting current at the LED lamp, one end of the first current sampling circuit (4) is connected with the LED lamp, and the other end of the first current sampling circuit is connected with the reverse end of the voltage following circuit (3);
the second current sampling circuit (5) is used for collecting the current at the output end of the voltage following circuit (3), one end of the second current sampling circuit (5) is connected with the output end of the voltage following circuit (3), and the other end of the second current sampling circuit is connected with the driving chip (1);
the driving chip (1) is connected with the power supply circuit and the LED lamp through the first current sampling circuit (4) to form a loop.
2. The high-power LED lamp driving circuit for movies and televisions as claimed in claim 1, wherein the first current sampling circuit (4) comprises a first resistor and an inductor, the first resistor and the inductor are connected in series; the drive chip (1) adopts an MP4000 chip, and a first MOS tube is connected between a DRV pin of the MP4000 chip and the inductor.
3. The high-power LED lamp driving circuit for movies and televisions as claimed in claim 2, wherein the second current sampling circuit (5) comprises a second resistor and a second MOS tube, the CS pin of the MP4000 chip is connected with the D-stage of the second MOS tube, a first optical coupler is connected between the G pole of the second MOS tube and the voltage follower circuit (3), the pin 1 of the first optical coupler is connected with the output end of the voltage follower circuit (3), the pin 2 is grounded, the pin 3 is connected with the G pole of the second MOS tube, the S pole of the second MOS tube is connected with one end of the second resistor, and the other end of the second resistor is connected with the S pole of the first MOS tube.
4. The high-power LED lamp driving circuit for movies and televisions as claimed in claim 1, wherein the main control unit comprises an MCU chip (6) and a second optocoupler, the MCU chip (6) is used for outputting a PWM driving signal, an IO port of the MCU chip (6) is connected with a pin 1 of the second optocoupler, and a pin 3 of the second optocoupler is connected with a non-inverting terminal of the voltage follower circuit (3).
5. The high-power LED lamp driving circuit for movies and televisions as claimed in claim 1, wherein the power circuit comprises a power supply and a rectifying circuit, the rectifying circuit comprises an alternating current rectifying circuit and an AC/DC converting circuit, the alternating current rectifying circuit comprises a rectifying bridge, the power supply is connected with the AC/DC converting circuit through the rectifying bridge, and the AC/DC converting circuit is used for supplying power to the main control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020161259.5U CN211406378U (en) | 2020-02-11 | 2020-02-11 | High-power LED lamp drive circuit for movie and television |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020161259.5U CN211406378U (en) | 2020-02-11 | 2020-02-11 | High-power LED lamp drive circuit for movie and television |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114337474A (en) * | 2021-12-16 | 2022-04-12 | 拓尔微电子股份有限公司 | Drive control circuit and motor control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114337474A (en) * | 2021-12-16 | 2022-04-12 | 拓尔微电子股份有限公司 | Drive control circuit and motor control circuit |
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