Implementation of Digital Signal Processor Based Digital Controller for High Voltage Switch Mode Power Supply

The Paper is based on “Design and implementation of TMS320F28035 Digital Signal Processor (DSP) based digital controller for 2 kW switch mode power supply (SMPS)”.In the earlier research has implemented the analog controller, In the analog implementation of power controller comes with inherent disadvantage of aging, lack of flexibility, complexity in design etc. those are successfully overcomes by using digital based implementation. Also the choices of digital implementation platform being DSP give it a higher edge over a microcontroller. The main goal of this paper is controlling the dc output voltage from 10kV to 20kV of the SMPS by using DSP (TMS320F28035) based digital controller. It has to generate variable frequency gate signals to the semiconductor devices (MOSFETs) used in half bridge configuration of SMPS. It also has to regulate the output DC voltage within ± 1% of set value in control loop. The DSP based controller is designed using the same functional blocks as used for its analog counterpart i.e. Analog to Digital Converter (ADC), Control Law (CL) and Pulse Width Modulator (PWM). The control law is based on Proportional Integral Derivative (PID) control. The complete software for DSP controller is developed in C language using the Texas instruments Code Composed Studio software. The power circuit topology designed and simulated using LTSPICE-IV simulation software. The topology power circuit consists of SMPS in half bridge topology with LLC as resonant elements and open loop DSP based digital controller. Keywords-DSP, SMPS, MOSFET, LLC, LTSPICE-IV