CN102157893B - Medical laser power control module based on complex programmable logic device (CPLD) - Google Patents

Abstract

The invention provides a medical laser power control module based on a complex programmable logic device (CPLD), which is characterized in that hardware comprises a CPLD chip, a 4*4 keyboard, a liquid crystal display (LCD) module, a digital thermometer chip, a digital potentiometer chip, a light-emitting diode (LED) of an alarm indicator and a 12MHz crystal oscillator, wherein the CPLD chip is the core control part of the whole module and used for controlling operation of the other parts; and the CPLD chip is a programmable logic device (PLD) based on a product term structure and applied to realizing complicated combination and sequential logic at a high speed particularly. A human-machine interaction interface formed by the LCD and the keyboard is controlled to regulate the output resistance value of a digital potentiometer so as to reach the purpose of changing the transmitting power level of the laser; and meanwhile, the functions of ambient temperature in which the laser is located, high-temperature alarm, timing control and the like can be achieved.

Description

A kind of medical laser device power control module based on CPLD

Technical field

The present invention relates to a kind of medical laser device control technology or electronic information field, is mainly a kind of medical laser device power control module based on CPLD that is applied to medical industry.

Background technology

As everyone knows, the advantage such as laser has good directionality, brightness is high, monochromaticjty good, the coherence is good, so laser has been widely used at military affairs, processing, medical treatment and field of scientific study.At present solid state laser is usage comparison a kind of laser widely, has an output energy large, and peak power is high, the advantage that compact conformation is durable.Current solid state laser is very widely in the application of medical treatment aspect beauty treatment, for example medically commonly using the laser cutter of performing an operation, is applied to department of general surgery, ear-nose-throat department, urological department, orthopaedics and department of plastic surgery etc.Utilize the euangiotic tissue of laser cutting, can greatly reduce hemorrhagely, because pulsed laser energy is large, be difficult for being absorbed by water and hemoglobin, therefore penetrate tissue is darker.

But solid state laser also has shortcoming: the temperature benefit is more serious, and caloric value is large.Large just because of the output energy, peak power is high, causes thermal effect very obvious, therefore has to configure the normal of cooling system guarantee solid state laser and uses continuously.The present invention can effectively make up these deficiencies, controls by CPLD the adjustable resistance that a programmable digital regulation resistance replaces existing power supply of solid laser inside, realizes the accurate adjustment of laser power; Pass through simultaneously the temperature of the setup control laser of temperature, avoided large caloric value and power consumption.Thereby effectively guaranteed patient's safety.

Summary of the invention

The purpose of this invention is to provide a kind of medical laser device power control module based on CPLD.

By the fine adjustment of laser power of the present invention, guarantee that the patient can be not too high and burnt due to the power output of laser.Core is to utilize the Programmable Technology of CPLD, realizes adjusting and the real-time temperature that shows laser to laser power.

The objective of the invention is to realize in the following manner, hardware comprises: CPLD chip, 4 * 4 keyboards, LCD MODULE LCD, digital thermometer chip, digital regulation resistance chip, alarm lamp LED and 12MHz crystal oscillator; Wherein:

The CPLD chip is used for the work of each parts on control module; The model of CPLD chip is EPM7064SLC44-10;

1) 4 * 4 keyboards are connected to the CPLD chip, as the core of whole invention, are used for the work of each parts on control module; 9 I/O lines of CPLD chip utilize the Programmable Technology of CPLD chip to realize 4 * 4 keyboard scan function;

2) LCD MODULE LCD is connected on 11 I/O lines of CPLD chip, and by the demonstration of programming, the various parameters of realization of decoding, the model of LCD MODULE is LCM1602

3) the 12MHz crystal oscillator takies the I/O line of 1 CPLD chip, as the clock input of module;

4) alarm lamp LED takies the I/O line of 1 CPLD chip, is used for the warning of module;

5) digital thermometer chip takies the I/O line of 1 CPLD chip, realizes the collection of temperature, and the model of digital thermometer is DS1820;

6) digital regulation resistance chip, the I/O line of 3 CPLD chips of connection is realized the CPLD chip to the adjustment of potentiometer, the model of digital regulation resistance is DS1867;

The operational process of control module is as follows:

1) module resets: whole module is carried out electrification reset, and this moment, alarm lamp LED was in the state that goes out, and LCD MODULE LCD is in not show state;

2) timing parameters is set: realize the setting of timing parameters by the CPLD chip programming, the circulation displaying time that digital thermometer chip is set is 1 second, the timing of digital regulation resistance chip is 1 minute, and this moment, LCD MODULE LCD can show this timing;

3) power control section is divided: reach by the control to the digital regulation resistance chip laser power is controlled; It is to realize by the packet of 17 bits of serial transfer that the output of digital regulation resistance chip is controlled, bit0 is that the position is selected in potentiometer output, 0,1 select respectively potentiometer 0, potentiometer 1, then be 8bit potentiometer 1 control word and 8 potentiometer 0 control words, the output level of respectively corresponding two some position device 0-255 is controlled, adopted potentiometer 0, transmit packet by keyboard input, thereby control the output level of potentiometer 0, the CPLD chip shows output level 0-255 with the binary-coded decimal form by programming decoding on LCD MODULE LCD simultaneously;

4) temperature setting and collection: digital thermometer chip is resetted to arrange with being operated in of initiation parameter carry out before the potentiometer grade, lower limit and the upper limit of the mode set temperature value of inputting by keyboard, the binary-coded decimal of LCD MODULE LCD displays temperature, after the resistance value that sets up potentiometer, carry out temperature acquisition and the read work of laser environment of living in, at this moment the CPLD chip sends temperature transition and the order of reading internal register by keyboard to digital thermometer chip more in succession, the temperature that reads can be presented on LCD MODULE LCD every 1 second, when temperature exceeds set scope, the CPLD chip will be lighted warning LED, should reduce the power of laser with the indication operating personnel, after the output resistance that resets digital regulation resistance, carry out again the acquisition and display of temperature, when total timing arrives, the CPLD chip resets to digital regulation resistance, thereby be through with this operation.

Beneficial effect of the present invention is take CPLD as core, realizes regulating the output resistance of digital regulation resistance by the Man Machine Interface of controlling LCD, keyboard composition, thereby reaches the purpose that changes the laser emitting power grade; The functions such as the residing ambient temperature of detection laser, high temperature alarm and timing controlled have also been realized simultaneously.

Description of drawings

Fig. 1 is the composition diagram of medical laser device power control module.

Fig. 2 is the workflow diagram of medical laser device power control module.

Embodiment

With reference to Figure of description, module of the present invention is described in detail below.

Module of the present invention mainly comprises following a few part:

CPLD chip: be the core control part of whole module, control the operation of miscellaneous part by it.The CPLD model that the present invention adopts is the EPM7064SLC44-10 of the MAX7000S of U.S. altera corp series 44 pins.This chip is based on the PLD of product term structure, is specially adapted to realize complicated at a high speed combination, sequential logic.The device door number of EPM7064SLC44-10 is 2500, and macrocell is 64, and logic array block is 4, and the I/O number of pins is 36.Above resource can satisfy the design requirement of module fully.

LCD MODULE: the display interface of module adopts LCM1602, and the LCD MODULE of 2 row 16 characters is in order to show the parameters such as power grade, timing parameters and variations in temperature.

Key input section: the user inputs and adopts typical 4 * 4 determinant keyboard scans, coordinates between LCD and user and carries out alternately.

The digital regulation resistance chip: the control function of power that the present invention realizes comes the adjustable resistance of instead of dedicated power supply inside by regulating this programmable digital regulation resistance, realizes changing the power of laser.The DS1867 chip is that U.S. DALLAS company produces, and it comprises the potentiometer of two 256 grade outputs, and the resistance adjustable extent is 0～10k Ω, programmes by serial mode, and the I/O mouth that takies is few.Include EEPROM, potentiometer can be protected after being arranged on power down automatically.

Digital thermometer chip: the DS1820 chip is a kind of temperature acquisition device, be also that U.S. DALLAS company produces, it has adopted the 1-wire bus interface technology, and Range of measuring temp is-55 ℃-+125 ℃, precision can reach 0.0675 ℃, and be 200ms maximum change-over time.The encapsulation of this chip only has 3 pins, wherein only need to can complete bidirectional data transfers by a pin.

Alarm lamp LED: adopt a light-emitting diode as alarm lamp, when the temperature that laser detected exceeds the scope of setting, light light-emitting diode.

Crystal oscillator: adopt the active crystal oscillator of a 12MHz as the clock of whole module, carry out in order under the control that operates at this clock of whole module.

Embodiment

As shown in Figure 1, a kind of medical laser device power control module based on CPLD of the present invention comprises: CPLD EPM7064SLC44-10 chip, 4 * 4 keyboards, LCD demonstration, digital thermometer DS1820 chip, digital regulation resistance DS1867 chip, alarm lamp and 12MHz crystal oscillator.

The annexation of this module all parts is:

1.4 * 4 keyboards are connected to 9 I/O lines of CPLD, utilize the Programmable Technology of CPLD to realize 4 * 4 keyboard scan function; 2.LCM1602 be connected on 11 I/O lines of CPLD, by the demonstration of programming, the various parameters of realization of decoding;

3.12MHz crystal oscillator takies the I/O line of 1 CPLD, as the clock input of module;

4. alarm lamp takies the I/O line of 1 CPLD, is used for the warning of module;

5. digital thermometer DS1820 takies the I/O line of 1 CPLD, realizes the collection of temperature;

6. digital regulation resistance DS1867 connects the I/O line of 3 CPLD, realizes that CPLD is to the adjustment of potentiometer.

Operational process of the present invention as shown in Figure 2,

1. module resets: whole module is carried out electrification reset, and this moment, alarm lamp was in the state that goes out, and LCD is in not show state.

2. timing parameters is set: programme by CPLD and realize the setting of timing parameters, for example the circulation displaying time of set temperature is 1 second, and the timing of potentiometer is 1 minute.This moment, LCD can show this timing.

3. power control section is divided: reach by the control to digital regulation resistance DS1867 laser power is controlled.It is to realize by the packet of 17 bits of serial transfer that the output of DS1867 is controlled.Bit0 is that the position is selected in potentiometer output, and 0,1 selects respectively potentiometer 0, potentiometer 1, is then 8bit potentiometer 1 control word and 8 potentiometer 0 control words, respectively the output level (0-255) of corresponding two some position devices.Reality of the present invention has adopted potentiometer 0, transmits packet by keyboard input, thereby controls the output level of potentiometer 0, and CPLD shows output level (0-255) with the binary-coded decimal form by programming decoding on LCD simultaneously.For example: when the control word of potentiometer 0 inputted 10110100, the corresponding grade that shows on LCD was " 180 ", and the potentiometer resistance value of this moment is 10k Ω * (180/256)=7.03k Ω.

4. temperature setting and collection: as accompanying drawing 2, chip temperature DS1820 is resetted to arrange with being operated in of initiation parameter carry out before the potentiometer grade, lower limit and the upper limit of the mode set temperature value of inputting by keyboard, the binary-coded decimal of LCD displays temperature.After the resistance value that sets up potentiometer, carry out temperature acquisition and the read work of laser environment of living in, at this moment CPLD in succession sends temperature transition by keyboard to DS1820 again and gets final product with the order of reading internal register.The temperature that reads can be presented on LCD every 1 second, CPLD will light warning LED when temperature exceeds set scope, should reduce the power of laser with the indication operating personnel, after the output resistance that resets digital regulation resistance, then carry out the acquisition and display of temperature.When total timing arrived, CPLD resetted to digital regulation resistance, thereby is through with this operation.

Claims (1)

1. the medical laser device power control module based on CPLD, is characterized in that, hardware comprises: CPLD chip, 4 * 4 keyboards, LCD MODULE LCD, digital thermometer chip, digital regulation resistance chip, alarm lamp LED and 12MHz crystal oscillator; Wherein:

The CPLD chip is used for the work of control module; The model of CPLD chip is EPM7064SLC44-10;

1) 4 * 4 keyboards are connected to the CPLD chip, as the core of whole invention, are used for the work of control module; 9 I/O lines of CPLD chip utilize the Programmable Technology of CPLD chip to realize 4 * 4 keyboard scan function;

2) LCD MODULE LCD is connected on 11 I/O lines of CPLD chip, and by the demonstration of programming, the various parameters of realization of decoding, the model of LCD MODULE is LCM1602;

3) the 12MHz crystal oscillator takies the I/O line of 1 CPLD chip, as the clock input of module;

4) alarm lamp LED takies the I/O line of 1 CPLD chip, is used for the warning of module;

5) digital thermometer chip takies the I/O line of 1 CPLD chip, realizes the collection of temperature, and the model of digital thermometer is DS1820;

6) digital regulation resistance chip, the I/O line of 3 CPLD chips of connection is realized the CPLD chip to the adjustment of potentiometer, the model of digital regulation resistance is DS1867;

The operational process of control module is as follows:

1) module resets: whole module is carried out electrification reset, and this moment, alarm lamp LED was in the state that goes out, and LCD MODULE LCD is in not show state;

2) timing parameters is set: realize the setting of timing parameters by the CPLD chip programming, the circulation displaying time that digital thermometer chip is set is 1 second, the timing of digital regulation resistance chip is 1 minute, and this moment, LCD MODULE LCD can show this timing;

3) power control section is divided: reach by the control to the digital regulation resistance chip laser power is controlled; It is to realize by the packet of 17 bits of serial transfer that the output of digital regulation resistance chip is controlled, bit0 is that the position is selected in potentiometer output, 0,1 select respectively potentiometer 0, potentiometer 1, then be 8bit potentiometer 1 control word and 8 potentiometer 0 control words, the output level of respectively corresponding two potentiometer 0-255 is controlled, adopted potentiometer 0, transmit packet by keyboard input, thereby control the output level of potentiometer 0, the CPLD chip shows output level 0-255 with the binary-coded decimal form by programming decoding on LCD MODULE LCD simultaneously;

4) temperature setting and collection: digital thermometer chip is resetted to arrange with being operated in of initiation parameter carry out before the potentiometer grade, lower limit and the upper limit of the mode set temperature value of inputting by keyboard, the binary-coded decimal of LCD MODULE LCD displays temperature, after the resistance value that sets up potentiometer, carry out temperature acquisition and the read work of laser environment of living in, at this moment the CPLD chip sends temperature transition and the order of reading internal register by keyboard to digital thermometer chip more in succession, the temperature that reads can be presented on LCD MODULE LCD every 1 second, when temperature exceeds set scope, the CPLD chip will be lighted warning LED, should reduce the power of laser with the indication operating personnel, after the output resistance that resets digital regulation resistance, carry out again the acquisition and display of temperature, when total timing arrives, the CPLD chip resets to digital regulation resistance, thereby be through with this operation.

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