Application of Adaptive Dead-beat Controller in Drying Process

In the article a temperature control is dealt in drying machines during a manufacturing process of printed circuits boards. A problem occurs if the temperature is not complied during a drying process of a solder mask and a service printing. It involves to depreciation of the printed circuit board, especially if the surface mount devices are used. An adaptive polynomial controller was designed to improve the temperature control. The controller is constructed by dead-beat method and it is implemented into 8-bit microcontroller, which has supervision of control process of whole drying system.The controller is based on a recursive identification algorithm, which identifies the dryer system. That identification proceeds continuously during the printed circuits boards drying process. Parameters of controller are recalculated in each period on the basis of data obtained by identification.