Percorrer por autor "Rezende, Rafael Luis Yanase de"
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- Bang-bang temperature controller for a custom-made SMD reflow ovenPublication . Rezende, Rafael Luis Yanase de; Coelho, João PauloThis paper present the preliminary results regarding the application of a simple bang-bang control strategy to a custom-made SMD reflow oven. This appliance was built by retrofitting a recycled electric oven where both measurement and actuation chains are included. It will be shown that set-point tracking cannot be attained accurately and that severe temperature oscillations are observed.
- Modelling and control of a retrofitted oven for SMD reflowPublication . Rezende, Rafael Luis Yanase de; Coelho, João PauloThis paper deals with the modelling and control of an oven for reflowing electronic surface-mounted devices. The modelling is done taking into account that the system has a second-order dynamic behaviour whose parameters were obtained through a genetic algorithm. It is also shown that this system exhibits a high pure time-delay which makes the design of the control system very difficult. In particular, the performance of a PI controller is evaluated with respect to tracking two different types of reference signals. It is observed that the performance of such a controller is severely affected by the huge inertia of the system. In order to mitigate this effect, tests were performed with a different architecture known as the Smith predictor. It is concluded that, although with differences, neither the PI controller nor the Smith allows the tracking of the typical reference in a reflow process.