Takahashi controller with continuous identification in fast response application

Abstract

The paper describes Takahashi controller with an adaptive system identification in a fast response application and describes hardware design with an 8-bit microcontroller. Takahashi controller is modified PSD controller and due to simple calculation of controller's parameters it can be implemented into the 8-bit microcontroller. The microcontroller was selected from Freescale semiconductor, specifically MC9S08DZ60 which has maximum allowed frequency 40MHz. The identification is based on the least squared recursive method in the beginning of the control process and during the operation at the moment when user changes systems parameters. These are given by the application of the fast response temperature control of soldering tips which are changeable during soldering process. In the first part of the paper the controller is described and in the second part practical aspects of hardware design, such as low power consumption, method how to measure temperature by thermocouple which shares wires with heater and design of AD converter are described.