Abstract
In daily life, industrial and laboratory applications of the incubator is popular, and its importance is obvious .In the laboratory, in particular the cultivation of biological laboratories, incubators application is universal, its accuracy is also higher and more stringent requirements.
In this design, we focused on the design of a laboratory use incubators, in the constant temperature box system where, through the incubator temperature detection and Jiang temperature of the conversion value of transmission to the MCU, compared with a given value,MCU on the data processing, according to the size of the error signal output, PWM output by changing the period and amplitude control of IGBT's closing time of opening, wire the power to control fever, and to achieve constant temperature inside the temperature control. The design of the MCU size is AT89S52, the data collection, comparison, processing and output, pulse output by microcomputer control, and input through the optical isolation amplifier circuit to heat filament heated directly and raise the temperature of the box and finally achieve the purpose of temperature control.
Keywords Monolithic Integrated Circuits PWM Digital Temperature Sensor DS18B20
