CN204832997U

CN204832997U - Constant temperature control system

Info

Publication number: CN204832997U
Application number: CN201520506088.4U
Authority: CN
Inventors: 林少疆; 林振华; 林振坤
Original assignee: Fujian Province Wuzhog Machinery Co Ltd
Current assignee: Fujian Province Wuzhog Machinery Co Ltd
Priority date: 2015-07-14
Filing date: 2015-07-14
Publication date: 2015-12-02
Anticipated expiration: 2025-07-14

Abstract

The utility model discloses a constant temperature control system, including singlechip U1, interface module, AD conversion module, stabilizing detection module, PWM control module and SSR module, singlechip U1 connects interface module, alarm module, PWM control module and AD conversion module respectively, and interface module still connects LED module and keyboard module, and AD conversion module still connects the platinum resistance through temperature detection module, and PWM control module still connects the module of generating heat through the SSR module. The utility model discloses a based on SSR and single chip microcomputer control's constant temperature control system, has the circuit simply reliably and control accuracy's characteristics.

Description

A kind of thermostatic control system

Technical field

The utility model relates to a kind of control system, specifically a kind of thermostatic control system.

Background technology

At present, various electronics applications is in the every aspect of our daily life, but all electronic products have certain serviceable life, can along with service time passing gradually aging circuit test experiments case be widely adopted, in Thermostat Temperature Control system, generally based on single-chip microcomputer design, its actuator generally adopts silicon controlled module, and control algolithm adopts dibit control method, fuzzy control method, tradition: PID control method, fuzzy PID control method etc.Adopt silicon controlled module to realize more complicated as actuating mechanism circuit, and system reliability is difficult to ensure; Adopt dibit control method control accuracy more coarse, simple fuzzy control control method controls intensive reading and can not ensure equally.For the temperature control system with large dead time characteristic, all there is difficult parameters with the shortcoming of adjustment in traditional PID control and fuzzy-adaptation PID control.

Utility model content

The purpose of this utility model is to provide a kind of thermostatic control system combined based on SSR and single-chip microcomputer, to solve the problem proposed in above-mentioned background technology.

For achieving the above object, the utility model provides following technical scheme:

A kind of thermostatic control system, comprise single-chip microcomputer U1, interface module, A/D modular converter, stable detection module, PWM control module and SSR module, described single-chip microcomputer U1 is connection interface module, alarm module, PWM control module and A/D modular converter respectively, interface module also connects LED module and Keysheet module, described A/D modular converter also connects platinum resistance by temperature detecting module, and described PWM control module is also by SSR model calling heating module.

Described SSR module comprises chip U2, resistance R1, triode VT1, rectifier bridge Q, one-way SCR VS and bidirectional triode thyristor VR, resistance R1 connects diode VD negative pole and chip U2 pin 1, chip U2 pin 2 connects diode VD positive pole and input end Vi respectively, the input end Vi other end contact resistance R1 other end, described chip U2 pin 3 contact resistance R2, the resistance R2 other end is contact resistance R3 and triode VT1 base stage respectively, the resistance R3 other end is contact resistance R4 respectively, the A pole of one-way SCR VS and rectifier bridge Q pin 1, described chip U2 pin 4 is connecting triode VT1 emitter respectively, the K pole of one-way SCR VS and rectifier bridge Q pin 3, the G pole contact resistance R4 other end and the triode VT1 collector respectively of one-way SCR VS, described rectifier bridge Q pin 4 contact resistance R6, the resistance R6 other end connects the T1 pole of bidirectional triode thyristor VR respectively, the G pole of bidirectional triode thyristor VR, electric capacity C1 and output end vo, the output end vo other end is contact resistance R5 respectively, the T2 pole of the resistance R7 other end and bidirectional triode thyristor VR.

As further program of the utility model: described single-chip microcomputer U1 model is AT89C51.

As further program of the utility model: described chip U2 model is 4N25.

As further program of the utility model: described interface module adopts chip 8155A.

As the utility model further scheme: described A/D modular converter adopts ADC0809.

Compared with prior art, the beneficial effects of the utility model are: the utility model is based on SSR and monolithic processor controlled thermostatic control system, have the simple and reliable and feature of control accuracy of circuit.

Accompanying drawing explanation

Fig. 1 is the schematic block circuit diagram of thermostatic control system;

Fig. 2 is SSR module circuit diagram in thermostatic control system.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

Refer to Fig. 1 ~ 2, in the utility model embodiment, a kind of thermostatic control system, comprise single-chip microcomputer U1, interface module, A/D modular converter, stable detection module, PWM control module and SSR module, single-chip microcomputer U1 is connection interface module, alarm module, PWM control module and A/D modular converter respectively, interface module also connects LED module and Keysheet module, and A/D modular converter also connects platinum resistance by temperature detecting module, and PWM control module is also by SSR model calling heating module.

SSR module comprises chip U2, resistance R1, triode VT1, rectifier bridge Q, one-way SCR VS and bidirectional triode thyristor VR, resistance R1 connects diode VD negative pole and chip U2 pin 1, chip U2 pin 2 connects diode VD positive pole and input end Vi respectively, the input end Vi other end contact resistance R1 other end, chip U2 pin 3 contact resistance R2, the resistance R2 other end is contact resistance R3 and triode VT1 base stage respectively, the resistance R3 other end is contact resistance R4 respectively, the A pole of one-way SCR VS and rectifier bridge Q pin 1, chip U2 pin 4 is connecting triode VT1 emitter respectively, the K pole of one-way SCR VS and rectifier bridge Q pin 3, the G pole contact resistance R4 other end and the triode VT1 collector respectively of one-way SCR VS, rectifier bridge Q pin 4 contact resistance R6, the resistance R6 other end connects the T1 pole of bidirectional triode thyristor VR respectively, the G pole of bidirectional triode thyristor VR, electric capacity C1 and output end vo, the output end vo other end is contact resistance R5 respectively, the T2 pole of the resistance R7 other end and bidirectional triode thyristor VR.

Single-chip microcomputer U1 model is AT89C51.

Chip U2 model is 4N25.

Interface module adopts chip 8155A.

A/D modular converter adopts ADC0809.

Principle of work of the present utility model is: please participate in Fig. 1, select platinum resistance as detecting element, parallel interface chip 8155A is selected to expand keyboard, LED display interface, A/D converter ADC0809 carries out counting touching conversion, alarm module external buzzer, for the high temperature alarm of detected temperatures, Keysheet module is used for the setting of systematic parameter, set-point, the system that realizes starts, stops and other functions, and LED module is used for setup parameter, to the display of fixed temperature, Current Temperatures etc.

Refer to Fig. 2, when there is no input signal, phototriode cut-off in chip U2, triode VT1 is alternating voltage monitor at zero point, the saturation conduction by resistance R3 acquisition base current, the gate pole of one-way SCR VS is buckled in electronegative potential and is in off state, when an input signal is present, chip U2 conducting, now the state of one-way SCR VS is determined by triode VT1, if when supply voltage is greater than zero passage voltage, voltage divider resistor R2, the dividing point voltage of resistance R3 is greater than triode VT1 forward voltage, then triode VT1 saturation conduction, one-way SCR VS gate pole ends in low-voltage because of button bit, the gate pole of bidirectional triode thyristor VR is in off state because not having trigger pulse.Only have when supply voltage is less than zero passage voltage, triode VT1 ends, the conducting by resistance R4 acquisition trigger pip of one-way SCR VS gate pole.Obtain the trigger pulse from the positive and negative both direction of R6 → Q → VS → Q → R5 and R5 → Q → VS → Q → R6 at the gate pole of bidirectional triode thyristor VR, bidirectional triode thyristor VR conducting, thus connect load power source.Have no progeny when input signal closes, phototriode cut-off in chip U2, triode VT1 saturation conduction, one-way SCR VS gate pole is made to be clamped at electronegative potential and to turn off, but now bidirectional triode thyristor VR still keeps conducting state, output terminal Vi still has electric current to flow through, until output terminal Vi electric current just turns off after being reduced to the maintenance electric current being less than bidirectional triode thyristor VR voluntarily, cuts off output terminal Vi.

The course of work of system is as follows: after system enters duty, first platinum resistance is the magnitude of current the temperature transition of ageing oven, and through excess temperature detection circuit and A/D converter, be converted to digital signal input single-chip microcomputer, then draw through single-chip microcomputer computing and control export and be sent to PWM control module, PWM control module is adjusted digital signal as the pwm signal for certain dutycycle in some cycles, SSR module is driven to control the break-make of heating wire, circulation like this is gone down, and finally reaches the object of precise control of temperature.

Claims

1. a thermostatic control system, comprise single-chip microcomputer U1, interface module, A/D modular converter, stable detection module, PWM control module and SSR module, it is characterized in that, described single-chip microcomputer U1 is connection interface module, alarm module, PWM control module and A/D modular converter respectively, interface module also connects LED module and Keysheet module, described A/D modular converter also connects platinum resistance by temperature detecting module, and described PWM control module is also by SSR model calling heating module;

2. thermostatic control system according to claim 1, is characterized in that, described single-chip microcomputer U1 model is AT89C51.

3. thermostatic control system according to claim 1, is characterized in that, described chip U2 model is 4N25.

4. thermostatic control system according to claim 1, is characterized in that, described interface module adopts chip 8155A.

5. thermostatic control system according to claim 1, is characterized in that, described A/D modular converter adopts ADC0809.