CN202340331U

CN202340331U - Digital stepless dimmer for LED light source of optical microscope

Info

Publication number: CN202340331U
Application number: CN2011203953966U
Authority: CN
Inventors: 陈军; 许祝; 王远平; 黄荣强; 龙永杰
Original assignee: CHONGQING RUISHENG KANGBO ELECTRICAL Co Ltd
Current assignee: CHONGQING RUISHENG KANGBO ELECTRICAL Co Ltd
Priority date: 2011-10-18
Filing date: 2011-10-18
Publication date: 2012-07-18
Anticipated expiration: 2021-10-18

Abstract

The utility model relates to brightness control of a light source of an optical microscope, and provides a digital stepless dimmer for an LED light source of an optical microscope, which can freely adjust the brightness of the background light source of the optical microscope according to different brightness requirements for different people. The digital stepless dimmer for the LED light source of the optical microscope adopts a single chip microcomputer PIC16LF722 to control the brightness of an LED in real time, and a high-performance metal oxide semiconductor (MOS) switch in a power amplification circuit is controlled to output a corresponding pulse-width modulation (PWM) wave which directly drives the LED light source to give light. The light adjustable power source control system is configured with, if necessary, the potential device or contact key adjusting function. The intensity of the light source is achieved by the digital pulse-width modulation technique, and besides, the potential device and the contact key are arranged on the surface of the optical microscope stand to control light adjustment, so that the overall heat dissipation performance of the microscope is improved and the safety and reliability are better.

Description

The electrodeless dimmer of light microscope led light source numeral

Technical field

The utility model relates to the microscope field, particularly relates to the light source feedway of light microscope.

Background technology

Traditional optical. in the microscope, adopt Halogen lamp LED or tungsten lamp etc. as lighting source, the life-span that Halogen lamp LED or tungsten lamp use is shorter always; Not only power consumption is big but also distribute a large amount of heat energy in when work, has not only reduced microscopical useful life, and has influenced microscopical observed result; Simultaneously because lighting source does not have brightness control function; Under brightness can't the adjustment situation, again since among the microscope work person everyone eyes the sensitiveness of brightness is had nothing in common with each other, therefore in use; Background light source can't with everyone eyes to being complementary of brightness, directly have influence on the accuracy of its observing effect and data.

Summary of the invention

The utility model goal of the invention provide a kind of can the utmost point according to different people eyes brightness requirement, and the electrodeless dimmer of the light microscope LED of its background light source brightness of illumination of regulated at will numeral.

The design of the utility model invention: the lighting source of light microscope is usually located at the below of concentrator; Along with development of electronic technology; The performance index of high brightness LED satisfy microscopical lighting requirement gradually; Be applied to how to regulate light-source brightness with Single-chip Controlling in the various light microscopes just successively as a kind of new light sources, making it convenient, safe and reliable is the problem that the utility model invention solves.

In order to realize the purpose of design of the utility model; On the basis of existing light microscope illuminating lamp; Increased LED numeral stepless dimmer; This numeral stepless dimmer can be according to the sensitiveness of different people eyes to brightness, and arbitrarily adjust the brightness of its light source, to reach best observing effect.

Fig. 1 is a light microscope entity sketch map, and it comprises that lampshade (a), light source b, light adjusting potentiometer (c), light modulation touch control button (d), power pack (g), 32 LED display windows (e) and (f) can to see the electrodeless dimmer of light microscope LED numeral in the drawings.

Fig. 2 is the electrodeless dimmer electricity of a microscope LED numeral theory diagram; (1) is the 6V DC power source input units; This 6V power supply is added to SPX117M3-3.3 voltage regulation unit (2), power amplification unit (6), light source cell (7) respectively; Show that for they provide a stable operating voltage: SPX117M3-3.3 voltage regulation unit (2) provides 3.3V power supply for single-chip microcomputer PIC16LF722 on output expanding element (8), 16 the PWM display units in left and right side (9) and (1), guarantee the single-chip microcomputer reliably working; (potentiometer) line sampling unit (4) inserts the A/D mouth of single-chip microcomputer (3); Touch key-press (5) inserts the I/O mouth of single-chip microcomputer (3); The pwm signal of single-chip microcomputer (3) output is sent into power amplification unit (6) through promoting light source works after the power amplification: PAM pulse 0-100% duty ratio is divided into 16 grades simultaneously; SPI mouth through single-chip microcomputer (3) sends to the demonstration output I/O mouth expanding element (8) by two 8 Bits Serial I/O or parallel Output Shift Register W74HC595 cascade with the duty ratio data, sends into 16 the PWM display units in left and right side (9) and (1) again and shows.

The utility model is that a kind of electrodeless dimmer of LED numeral that is used for light microscope will be provided, and it can adopt conventional potentiometer light modulation also can adopt touch control button to carry out light modulation, and light modulation PWM waveform intuitively shows with LED.

The electrodeless dimmer of light microscope LED numeral has adopted the PIC16LF722 single-chip microcomputer, and (brightness of (LED) is controlled to light-emitting diode in real time; High-performance MOS switch in the power controlling amplifying unit; Export corresponding pulse-width modulation PWM ripple, directly the driving LED light source luminescent.In this light modulation power control system, dispose can be as required potentiometer or touch key-press regulatory function.The intensity of light source has adopted the digital pulse width modulation technique to be achieved, and adds to use to place the potentiometer and the touch key-press regulating and controlling of light microscope susceptor surface, thereby makes that microscope integral heat sink performance is good, more safe and reliable.

Description of drawings

Fig. 1 light microscope entity sketch map

The electrodeless dimmer electricity of Fig. 2 microscope LED numeral theory diagram

The electrodeless dimmer electrical schematic diagram of Fig. 3 microscope LED numeral

The electrodeless dimmer scm software program flow diagram of Fig. 4 microscope LED numeral

Embodiment

Below in conjunction with accompanying drawing the utility model working of an invention is done further to set forth.

Fig. 3 is a microscope LED digital dimming power supply electrical schematic diagram; As can beappreciated from fig. 3 the 6V DC power supply supplies power to single-chip microcomputer PIC16LF722 after three end integrated voltage stabilizer SPX117M3-3.3 voltage regulation unit voltage stabilizings; Produce the variable pwm pulse signal of duty ratio of 500HZ by PIC16LF722; Pwm pulse signal outputs to power amplification unit, accomplishes by the conversion of signal voltage to the power electric current.0-100% duty ratio with pwm pulse is divided into 16 grades simultaneously; SPI mouth through RC3, RCS, RC6 sends to the demonstration output I/O mouth expanding element by two 8 Bits Serial I/O or parallel Output Shift Register W74HC595 cascade with the duty ratio data; Promote 2 tunnel 16 LED lights respectively by two W74HC595 and show current pwm pulse duty ratio, thereby accomplish indication current light source brightness synchronously.

Input terminal J 3 is connected to the corresponding I/O mouth of single-chip microcomputer with touch key-press input and voltage input in Fig. 3; The voltage of the RAO mouth sampling 0-3.3V of single-chip microcomputer; The pwm pulse duty ratio of modulation RC1 pin output; Pulse signal to power amplification unit, outputs to microscopical light source (lamp cabinet position) by J2 through R8.The duty ratio ratio outputs to W74HC595 by RC3, RC5, RC6 mouth and shows current duty ratio ratio.

KEY1-KEY4 is 4 touch key-presss in Fig. 3, and their function is respectively:

KEY1----switch: light source power supply switch

The KEY2----blast;

KEY3----subtracts secretly;

KEY4----potentiometer adjusting/touch key-press is regulated selector switch

Fig. 4 is a microscope LED digital dimming power supply scm software program flow diagram, this The software adopted C language.

This LED numeral stepless dimmer not only can be used on the led light source, also can be used in Halogen lamp LED or tungsten lamp etc. above the microscope as lighting source, can be so that operational observations is convenient, accurate, safe, reliable.

Claims

1. the electrodeless dimmer of light microscope led light source numeral, it is characterized in that: comprise digital brightness conditioning controller and PWM digital waveform display unit, said digital brightness conditioning controller comprises 6V dc power supply unit (1); The voltage regulation unit of forming by SPX1117M3-3.3 (2); By single-chip microcomputer PIC16LF722 is control core processing unit (3); Potentiometer (4); Touch key-press input unit (5); Power amplification unit (6); Light source unit for lighting (7); Show output expanding element (8); PWM digital waveform display unit (9) and (10); 6V DC power supply input (1) is added to SPX1117M3-3.3 voltage regulation unit (2), power amplification unit (6), light source (7) respectively, shows output expanding element (8), 16 the PWM display units in left and right side (9), (10), for they provide operating voltage; SPX1117M3-3.3 voltage regulation unit (2) provides 3.3V power supply for single-chip microcomputer PIC16LF722 (3); Potentiometer (4) inserts the A/D mouth of single-chip microcomputer PIC16LF722 (3); Touch key-press input unit (5) inserts the I/O mouth of Single-chip Controlling processing unit (3); The pwm signal of Single-chip Controlling processing unit (3) output is sent into power amplification unit (6) through promoting light source works after the power amplification; Pwm pulse 0-100% duty ratio is divided into 16 grades simultaneously; SPI mouth through Single-chip Controlling processing unit (3) sends to the demonstration output I/O mouth expanding element (8) by two W74HC595 cascades with the duty ratio data, sends into 16 the PWM display units in left and right side (9) and (10) again.