Real-time PID Adaptive Decoupled Controller Applied Over a DC-DC Multivariable Boost Converter

An embedded real-time PID adaptive controller is proposed for three boost converters connected to three LED strings. The voltage control of the LEDs can generate any Red-Green-Blue (RGB) combination in order to obtain a reference RGB color. The LED system control is implemented in real-time using an adaptive multivariable decoupled control, where the voltage tracking for each LED string is performed simultaneously using a boost converter. The adaptive controller is based on an online least squares recursive estimation method and a PID type 2 controller. The proposed adaptive controller is evaluated in simulation over a boost converter and in real-time over three boost converters using the BOOSTXL-C2KLED system and a LAUNCHXL-F28379D microcontroller from Texas Instruments. A detailed analysis is performed in terms of the tracking error, the duty cycle signal, and the current signal. This analysis is shown for the simulated boost converter and also for the multivariate decoupled controller in real-time.