Precise power control on time axis

Abstract

The object of this thesis is to design and realize a versatile microcomputer system and apply it to the precise control of electrical power. The specific application of this system as presented in the thesis is to control the temperature of a liquid on time axis by controlling the power of a heater unit according to specific requirements. Other possible applications could be chemical reactions that require precise temperature control or experiments that have to be realized under specific temperature conditipns. These requirements can be fulfilled by automatic control means most safely. A microcomputer based system is the optimum way of doing this. In this thesis, the design and the implementation of a microcomputer based temperature control system is presented. The main blocks of the system are a microcomputer an instrumentation amplifier and a digital firing angle control circuit. The .system realised operated satisfactorily enabling the control of temperature on time axis with a 0.25 °C resolution.