The Sliding Mode Control Strategy For Paralleled DC/DC System Based On Wireless Communication

The use of dc-dc converters connected in parallel is a suitable way to solve the technological problems that arise in large-capability power supply systems. With the development of science and technology,the wireless communication plays an important role. The application of wireless communication to transmission current sharing information for paralleled DC-DC power systems is capable of eliminating the need for physical connection and making it easier for the reconstruction of system. People are increasingly concerned on the parallel current sharing technology. So further research on parallel DC/DC converter system based on wireless communication has become the focus of attention of researchers.Sliding mode controller is a kind of non-linear robust control which non-linear reflects in non-continuous of control. This paper analyzed and introduced the principle of sliding mode variable structure control, and attempts to combined the sliding mode control with the Master-Slave current sharing technology to design the sliding mode Master-Slave current sharing controller, and verified the feasibility and rationality of this control strategy.And the Matlab/Simulink simulation results proved excellent control performance of this control strategy.This paper chooses double-channel integration base band RF transmitter MSS1832 and receiver MSR1842 to transmission current sharing information. And introduce in detail the hardware structure and process of this wireless transceiver. A sliding mode Master-Slave current sharing control paralleled Buck converter based on FPGA control chip EP4CE30 belongs to Cyclone IV series produced by Altera company was designed.Finally combined wireless transceiver with paralleled Buck converter to build the experiment platform. And the experimental results shows that the sliding mode control possessed of a better robustness against parameter uncertainties and external disturbance compared with the conventional double closed-loop PI control method.