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This work investigates fast-scale instability phenomena and chaotic control of voltage-controlled single-phase full-bridge inverter via varying load resistance. First, the operational principles of a voltage-controlled single-phase fullbridge inverter are examined and the mapping state-space equations are generated. Additionally, the MATLAB/SIMULINK tool is adopted for experimental simulation in this paper. The load resistance is changed to analyze the fast-scale instability waveforms of the inductor current and output voltage, and we propose the method of time-delay feedback for chaotic control to stable state of period-1. Experimental simulation clearly indicates that MATLAB/SIMULINK can provide available results and validate the mathematical models.Index Terms-Single-phase full-bridge inverter, fast-scale instability phenomena.

This paper investigates the nonlinear behaviors when the switching frequency changed in the UC3842 current-mode controlled flyback converter. First, State equations of the flyback converter are derived. The converter in continuous conduction mode (CCM) is then considered. Second, MATLAB/SIMULINK is used to construct simulation of the converter whose operation under varying switching frequency parameters. The output voltage, inductor current waveforms and phase-plane portraits are observed. It can be seen that the system exhibits nonlinear dynamics from period-one operation through period-doubling to chaos phenomena as the switching frequency are changed. From the simulation results, it is clearly evident that SIMULINK provide consistent results and verify the mathematical models and able to really understand the nonlinear behavior of the flyback converter.

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Power circuit is a voltage-mode controlled single-phase half-bridge inverter. This work investigates nonlinear dynamic behaviors with a valid and novel approach. Firstly, the operational principle of a singlephase half-bridge inverter is examined and mapping state-space equations are generated. Additionally, the SIMULINK tool for mathematical simulation and IsSpice for approximately physical simulation are adopted. The input DC voltage is changed to analyze the nonlinear dynamic behaviors waveforms of the inductor current and output voltage. Simulation results clearly demonstrate that SIMULINK and IsSpice provide consistent results and validate the mathematical models.