جستجوی مقالات مرتبط با کلیدواژه « سلف کلیدزنی شده » در نشریات گروه « برق »

In this paper, a novel transformerless DC-DC boost converter with very high voltage gain is proposed. By modular extension of the proposed structure, more improvements can be obtained in converter voltage gain and switch stress. The developed converter is designed using switched inductor/capacitor circuits and all of the switches are controlled by a single pulse width modulation (PWM) unit. In the presented topology, inductors current and capacitors voltage are equal during different transient and steady-state conditions. For this reason, in the closed-loop control of the proposed chopper, multiple voltage and current sensors are not required for measurement of the state variables. Also, performance of the proposed converter is compared with similar circuits which are reported in recent years. Experimental response of the proposed converter is investigated in both Continuous (CCM) and Discontinuous Conduction Modes (DCM) of operation. The experiment results are provided to verify the theoretical analysis. Finally, using a standard linear double-loop controller, closed-loop response of the developed converter is regulated under load and input voltage changes. It is shown that a unique current feedback is enough for regulation of the converter output voltage.

In this paper, a new structure for quasi-Z-source inverters based on the combination of switched inductors and transformers is proposed. In the proposed inverter, the high voltage gain is achieved by increasing the ratio of the transformer and the number of switched inductor cells. For proposed structure, the principles operation and calculations of voltage gains and average value of the voltage across the capacitors are provided. Power losses of the proposed structure are calculated and the efficiency comparison between the proposed and other structures is given. To determine the advantages and disadvantages of the proposed inverter, the comprehensive comparison between the proposed and conventional topologies is given. To prove the correctness operation of the proposed inverter, the simulation results in PSCAD/EMTDC are used.