CN203414847U

CN203414847U - TEC temperature controller based on single-chip microcomputer

Info

Publication number: CN203414847U
Application number: CN201320522456.5U
Authority: CN
Inventors: 戴伟; 陈芳; 牟长洲; 李科
Original assignee: XINJIANG HOPE ELECTRONIC CO Ltd
Current assignee: XINJIANG HOPE ELECTRONIC CO Ltd
Priority date: 2013-08-26
Filing date: 2013-08-26
Publication date: 2014-01-29
Anticipated expiration: 2023-08-26

Abstract

The utility model discloses a TEC temperature controller based on a single-chip microcomputer, and the TEC temperature controller comprises a controller, a temperature sensor, a TEC, input equipment, a D/A conversion circuit, a drive circuit, and a comparator. A temperature set value inputted by the input equipment is converted by the D/A conversion circuit and then inputted to the comparator. A temperature signal detected by the temperature sensor is inputted to the comparator. The converted temperature set value and the temperature signal detected by the temperature sensor are compared by the comparator to generate a signal which is outputted to the drive circuit and drives the TEC to work, thereby achieving the advantage in improving the stability of the system.

Description

SCM Based TEC temperature controller

Technical field

The utility model relates to domain of control temperature, particularly, relates to a kind of SCM Based TEC temperature controller.

Background technology

At present, TEC is semiconductor cooler, because its volume is little, mechanical rotating part and noise, can heat and refrigeration, and do not need to use the advantage of cold-producing medium and long service life, in the domain of control temperature of experimental technique, medical skill, space flight and aviation, boats and ships etc., be widely applied.But coefficient of refrigerating performance is low and the little deficiency of refrigerating capacity has limited its widespread use.In accurate temperature is controlled, temperature control system exactly wants cube small and exquisite, and work is quiet.

Utility model content

And the existing Stability of Systems of Temperature Control using at exquisite system is poor, thereby cause the precision of control not high enough.

The purpose of this utility model is, for the problems referred to above, proposes a kind of SCM Based TEC temperature controller, to realize the advantage that strengthens system stability.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of SCM Based TEC temperature controller, comprise controller, temperature sensor, TEC, input equipment, D/A change-over circuit, driving circuit and comparer, desired temperature input comparator after D/A change-over circuit of described input equipment input, the temperature signal input comparator that temperature sensor detects, the temperature signal that the above-mentioned desired temperature through conversion and temperature sensor detect, through the signal of comparer comparison, exports driving circuit to and drives TEC work.

Further, also comprise A/D change-over circuit and LCD display, the temperature signal that described temperature sensor detects shows in LCD display after A/D change-over circuit.

Further, described A/D change-over circuit, driving circuit and comparer are single-chip microcomputer.

Further, described controller model is MAX1978.

Further, described input equipment is keyboard.

Further, described single-chip microcomputer model is MSP430F449.

The technical solution of the utility model has following beneficial effect:

The technical solution of the utility model, by selecting TEL to combine with temperature sensor and input equipment, and by comparer, temperature threshold values is judged, thereby guaranteed the stable object of temperature control system in exquisite system, improve the precision of controlling, reached the advantage that strengthens system stability.

Accompanying drawing explanation

Fig. 1 is the SCM Based TEC temperature controller principle of work block diagram described in the utility model embodiment;

Fig. 2 is the SCM Based TEC temperature controller theory diagram described in the utility model embodiment.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.

As shown in Figure 2, a kind of SCM Based TEC temperature controller, comprise controller, temperature sensor, TEC, input equipment, D/A change-over circuit, driving circuit and comparer, desired temperature input comparator after D/A change-over circuit of input equipment input, the temperature signal input comparator that temperature sensor detects, the temperature signal that desired temperature through changing and temperature sensor detect, through the signal of comparer comparison, exports driving circuit to and drives TEC work.

Wherein, temperature controller also comprises A/D change-over circuit and LCD display, and the temperature signal that temperature sensor detects shows in LCD display after A/D change-over circuit.A/D change-over circuit, driving circuit and comparer are single-chip microcomputer, by modules integrated in single-chip microcomputer, realize.Controller model is MAX1978.Input equipment is keyboard, and input equipment E can be the input equipments such as writing pencil.Single-chip microcomputer model is MSP430F449.

Its specific works principle is: by keyboard to single-chip microcomputer set temperature value, through D/A, change, by the measured temperature signal of temperature survey transducer, to deliver in comparer, comparer compares it with the temperature by temperature sensor measurement, provide controlled quentity controlled variable, then by controlled quentity controlled variable, send driving circuit, drive controll plant, the temperature of controll plant shows after temperature sensor is to A/D modular converter on LCD, thereby formed real-time closed-loop system, as shown in Figure 1.The core of this closed-loop system is controller and driver portion, selects the special integrated circuit MAX1978 of semiconductor cooler can control semiconductor cooler TEC (model is FPH1-12705) completely, makes this controller can complete the function of refrigeration.

This controller adopts every MAX1978 to control a TEC simultaneously, for reaching, control more accurately object, can use multi-disc TEC, and adopt a plurality of controller MAX1978, MSP430F449 (adopting the MSP of TI company) has enough internal memories and the abundant interior peripheral hardware of sheet, makes single-chip microcomputer in application, have powerful function.With the I/O port of single-chip microcomputer, 12 A/D converters, liquid crystal driver module, serial communication etc., can simplify circuit.First use keyboard to set up temperature value, this keyboard is used the I/O mouth of single-chip microcomputer; Convert the temperature value of setting to analog quantity, need a D/A conversion, with the serial communication interface of single-chip microcomputer, be connected with 12 bit serial D/A converters; By control signal, give MAX1978 and drive chip, temperature sensor output real time temperature corresponding voltage value, converts digital quantity to 12 A/D converters, then to the filtering of averaging of each digital quantity, delivers to liquid crystal driver module and drive LCD demonstration.

TEC (ThermoelectricCooler), semiconductor cooler is to utilize the Peltier effect of semiconductor material to make.

In sum, technical solutions of the utility model also have following characteristics:

This controller, for the large occasion of refrigerating capacity, can be selected multi-disc TEC.For the equipment of long-term operation, increase the logarithm of cooling module, can obtain higher coefficient of refrigerating performance.

This controller volume is small and exquisite, and work is quiet.The cooling system of small size is well selected beyond doubt, guaranteed the quick response of system and higher reliability.

This controller is less than 20 W in refrigerating capacity, and when the temperature difference is no more than 50 ℃, the efficiency of semiconductor refrigerating is higher than the efficiency of compression-type refrigeration and other forms refrigeration.

This controller adopts special chip MAX1978 as its control core, can constantly to controlling temperature, automatically revise in the course of the work, therefore can overcome the error that long-term use and variation of ambient temperature cause, effectively improve measurement, the control accuracy of system.

Finally it should be noted that: the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although the utility model is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. a SCM Based TEC temperature controller, it is characterized in that, comprise controller, temperature sensor, TEC, input equipment, D/A change-over circuit, driving circuit and comparer, desired temperature input comparator after D/A change-over circuit of described input equipment input, the temperature signal input comparator that temperature sensor detects, the temperature signal that the above-mentioned desired temperature through conversion and temperature sensor detect, through the signal of comparer comparison, exports driving circuit to and drives TEC work.

2. SCM Based TEC temperature controller according to claim 1, is characterized in that, also comprises A/D change-over circuit and LCD display, and the temperature signal that described temperature sensor detects shows in LCD display after A/D change-over circuit.

3. SCM Based TEC temperature controller according to claim 1 and 2, is characterized in that, described A/D change-over circuit, driving circuit and comparer are single-chip microcomputer.

4. SCM Based TEC temperature controller according to claim 1 and 2, is characterized in that, described controller model is MAX1978.

5. SCM Based TEC temperature controller according to claim 1 and 2, is characterized in that, described input equipment is keyboard.

6. SCM Based TEC temperature controller according to claim 3, is characterized in that, described single-chip microcomputer model is MSP430F449.