CN202514114U - Dimming control system of light emitting diode (LED) in studio - Google Patents

Abstract

The utility model discloses a dimming control system of light emitting diode in a studio. The dimming control system of the light emitting lamp in the studio comprises an external main control machine, a main control plate, a main control plate constant-voltage power module, a high-power light emitting diode (LED) light source module, a display key module, a direct memory exchange (DMX) 512 interface module, an LED light source current-limiting voltage-limiting power source, a high-power metal oxide semiconductor (MOS) pipe module of the LED light source module. The main control plate receives data, then converses the data into modulated pulse-width modulation (PWM) signals, transmits the data to the LED light source current-limiting voltage-limiting power source and the high-power MOS pipe module of the LED light source module. The high-power MOS pipe module receives the PWM signals sent by the main control plate, to adjust the luminance of a lamp. The dimming control system of the light emitting diode (LED) in the studio can achieve unlimited dimming of the lamp without the need of control through a constant-current chip. Meanwhile, the connection mode of the LED light source current-limiting constant-voltage power source with the high-power MOS pipe module saves the constant-current chip, and therefore, the dimming control system of light emitting diode (LED) in studio guarantees the reliability of the system and reduces the cost.

Description

Perform in a radio or TV programme the dimming control system of Room LED light fixture

Technical field

The utility model relates to LED light fixture control technology field, and particularly a kind of great power LED is performed in a radio or TV programme the constant current PWM light adjusting system of Room light fixture.

Background technology

Led light source is very general in the application of various lighting fields, and has come into gradually and require than higher industry, as performs in a radio or TV programme spotlight in the Room, floodlight etc., and this type light fixture requires working condition reliable and stable, can far distance light regulation, and efficient is higher than conventional lamp.Most of on the market at present LED special chips that are based on band PWM interface realize that following weak point is arranged in application:

(1) drive current is bigger, and the heating of chip itself is just bigger, and most of constant current chips are paster encapsulation, directly are contained on the epoxy plate, and it is bad to dispel the heat.

(2) numerous with the supporting electronic devices and components of constant current chip, like resistance, electric capacity, inductance etc., cost are than higher, and components and parts are many more simultaneously, and reliability is low more.

When (3) the constant current chip is started from scratch slow PWM light modulation, be easy to occur the brightness saltus step, human eye looks discontinuous.

(4) present most of chip is primarily aimed at some ordinary luminaires, special industry hereto, and available high-power constant current chip is few.

Summary of the invention

The purpose of the utility model is to above-mentioned weak point, and a kind of simple and reliable dimming control system of performing in a radio or TV programme Room LED light fixture is provided.

The technical scheme of the utility model is: a kind of dimming control system of performing in a radio or TV programme Room LED light fixture; Include extraneous main control computer, master control borad, master control borad constant voltage source module, high-power LED light source module, display button module, DMX512 interface module, led light source and limit permanent pressure limiting power supply, high-power MOS tube module; This system comprises networking and two kinds of mode of operations of unit, under the networking mode of operation, sends the DMX512 signal by extraneous main control computer; Through the DMX512 interface module above the light fixture; Send to the RS485 interface above the master control borad, the specific address that shows above the display button module according to light fixture simultaneously, master control borad changes into the pwm signal that modulates after receiving corresponding data; Deliver to the high-power MOS tube module that has connected led light source current limliting constant voltage source; Big function rate metal-oxide-semiconductor module is also connecting the led light source module, through receiving the pwm signal that master control borad is sent, regulates the brightness of light fixture;

In unit mode of operation following time, only show the brightness value of light fixture on the display screen, scope is set between 0-255, and this moment, the DMX interface function was closed.

The beneficial effect of the utility model is: can realize the stepless dimming to light fixture; And need not the constant current chip controls; The connected mode of led light source current limliting constant voltage source and high-power MOS tube module has been save the constant current chip, has guaranteed the reliability of system and has successfully reduced cost.

Description of drawings

Fig. 1 is a master control borad SCM program flow chart;

Fig. 2 is the electronic system architecture sketch map;

Fig. 3 forms sketch map for master control borad.

Embodiment

Fig. 1 is a master control borad single-chip microcomputer workflow diagram; Main body adopts loop structure, receives for external signal and adopts the serial port interrupt mode, and frame data are whenever sent in the outside; Cause once and interrupt; When interruption times is consistent with the light fixture specific address, sends into corresponding PWM register to corresponding data, thereby change lamp brightness; Display module adopts to be beaten the mode of retouching and carries out, and decides scanning frequency by the timer interruption.

Key scan is not taked interrupt mode all carrying out in the program cycle each time, when twice scanning result is different; Then get into the key assignments pattern of pressing, set this register of flag bit and will be put 1, at this moment the DMX receiving function can be closed; After pattern and brightness or address setting completion; Single-chip microcomputer can get into an endless loop, overflows thereby cause watchdog microcontroller, thereby restarts single-chip microcomputer.

Fig. 2 is whole light fixture electronic system architecture sketch map, comprising: DMX512 interface module, constant voltage source module, master control borad, display button module, high-power MOS tube module, led light source current limliting constant voltage source, led light source module.

The DMX512 interface is 5 core interfaces, a public head above the face version, and a female head can receive like this, simultaneously also can forward signal;

The constant voltage source module, for voltage is the Switching Power Supply of DC24V, power is mainly master control borad about 10W, shows by strong module for power supply;

Master control borad is the core of whole system, is connecting the DMX512 interface; Show that by strong interface big function rate metal-oxide-semiconductor module is determining the mode of operation of system; And reception transforms outer extraneous data or the single cpu mode brightness data is the PWM square-wave signal, thus the brightness of control LED light fixture, and master control borad is remembered set-up function in addition; Can keep mode data, the power down data are not lost yet always;

The display button module, i.e. man-machine interface is to set the light fixture working method, the action pane of brightness value when light fixture DMX location or the work of single lamp, display screen can display mode letter and three bit digital, are the charactron mode;

Big function rate metal-oxide-semiconductor module is connecting led light source current limliting constant voltage source and led light source module, through receiving the pwm signal that master control borad is sent, regulates the brightness of light fixture;

Led light source current limliting constant voltage source has been save the constant current chip with the connected mode of high-power LED light source and metal-oxide-semiconductor adjusting module, has guaranteed the reliability of system and has successfully reduced cost;

The led light source module is that integrated encapsulation is many and with the light source module of radiator.

Fig. 3 is that the system of master control borad constitutes, and contains following part RS485 transmitting-receiving interface, reseting module, power module, MCU module, user-machine interface, PWM output interface.

RS485 transmitting-receiving interface receives the differential signal that the DMX interface transmits, and converts corresponding Transistor-Transistor Logic level to, sends in the single-chip microcomputer, and chip has two, a responsible reception, a responsible forwarding;

Reseting module provides the high voltage of enough time at the initial stage that powers on, and accomplishes initialization with the time enough that guarantees each parts of single-chip microcomputer;

Power module is for single-chip microcomputer and each chip required voltage to be provided, and native system is to change into the DC5V that chip needs to DC24V;

The MCU module is PIC16F737;

User-machine interface is used to connect display screen and button, and working hole voltage is 5V, plays a part reception by strong input signal and the output of demonstration charactron signal;

The PWM output interface is used to connect big function rate metal-oxide-semiconductor module, plays a part the output modulation signal.

Claims (2)

1. dimming control system of performing in a radio or TV programme Room LED light fixture; It is characterized in that including extraneous main control computer, master control borad, master control borad constant voltage source module, high-power LED light source module, display button module, DMX512 interface module, led light source and limit permanent pressure limiting power supply, high-power MOS tube module; This system comprises networking and two kinds of mode of operations of unit, under the networking mode of operation, sends the DMX512 signal by extraneous main control computer; Through the DMX512 interface module above the light fixture; Send to the RS485 interface above the master control borad, the specific address that shows above the display button module according to light fixture simultaneously, master control borad changes into the pwm signal that modulates after receiving corresponding data; Deliver to the high-power MOS tube module that has connected led light source current limliting constant voltage source; Big function rate metal-oxide-semiconductor module is also connecting the led light source module, through receiving the pwm signal that master control borad is sent, regulates the brightness of light fixture;

In unit mode of operation following time, only show the brightness value of light fixture on the display screen, scope is set between 0-255, and this moment, the DMX interface function was closed.

2. dimming control system of performing in a radio or TV programme Room LED light fixture as claimed in claim 1, it is characterized in that system's formation of said master control borad includes: RS485 receives and dispatches interface, reseting module, power module, MCU module, user-machine interface, PWM output interface;

RS485 transmitting-receiving interface receives the differential signal that the DMX interface transmits, and converts corresponding Transistor-Transistor Logic level to, sends in the single-chip microcomputer, and chip has two, a responsible reception, a responsible forwarding;

Reseting module provides the high voltage of enough time at the initial stage that powers on, and accomplishes initialization with the time enough that guarantees each parts of single-chip microcomputer;

Power module is for single-chip microcomputer and each chip required voltage to be provided, and native system is to change into the DC5V that chip needs to DC24V;

The MCU module is PIC16F737;

User-machine interface is used to connect display screen and button, and working hole voltage is 5V, plays a part reception by strong input signal and the output of demonstration charactron signal;

The PWM output interface is used to connect the high-power MOS tube module, plays a part the output modulation signal.

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