Robust Multi-Variable Controller Design for Two-Input Two-Output Fourth-Order DC-DC Converter

摘要

The presented two-input two-output fourth-order integrated (TITO-FOI) DC-DC converter is capable of regulating DC-bus voltage and low voltage source current with only two switches and four energy storage elements. Each switch duty control signal in TITO-FOI converter system will affect the two output variables causing interactions. These interactions must be measured for proper controller structure selection. Interactions measurements may not be accurate for a converter system as some methods suggest centralized and some other suggest decentralized control schemes. Hence, there is an ambiguity in selection of suitable controller architectures. To overcome such an ambiguity a centralized interaction independent controller was designed for TITO-FOI DC-DC converter using H_∞ loop-shaping design procedure. The effectiveness of TITO-FOI converter along with this centralized controller for the regulation of load division and bus voltage is demonstrated with simulation studies using a 36 V/ 12 Ⅴ to 24 V, 100W, prototype DC power distribution system.