Abstract
A tri-state converter with an additional boost-inductor free-wheeling interval was proposed earlier to eliminate the right-half-plane (RHP) zero that occurs in the control-to-output transfer function of a classical converter under continuous-conduction mode of operation. A constant-D/sub o/ control scheme, in which the capacitor-charging interval of the converter was kept constant, was employed. This resulted in a relatively large inductor current, especially under high line and load conditions, thereby causing high circuit losses. This paper proposes two variations of a novel dual-mode control (DMC) scheme that vary both the boost and the capacitor-charging intervals. Control analysis, design, and limitations of the proposed DMC schemes are presented. Through computer simulations and hardware experiments the performance of the tri-state converter with DMC schemes are compared with those of the tri-state converter with constant-D/sub o/ control scheme, and the classical PI-controlled converter. The DMC schemes achieve a significant (about 10%) improvement in converter's efficiency for a wide load range over the constant-D/sub o/ control scheme.
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