Analysis and Design of a Soft Switching Z-Source Boost DC-DC Converter

This paper proposes a high step-up fully soft switched Z-source Boost DC-DC converter, which uses two resonant paths to create soft switching conditions for switches and diodes and also increases the voltage gain. The proposed converter only has one switch, so it has a simple structure. Furthermore, its control circuit remains pulse width modulation. Since soft switching conditions are provided for all switching elements, the converter efficiency is very high. This converter also has all advantages of Z-source converters. The converter is analyzed and simulated in PSPICE software. The results confirm the aforementioned advantages and features of the proposed converte

Managing New PV Plant Connection to Available Grids to Stay within Standard Limits with a Case Study

PV plants are increasing all over the world and they are becoming a distinct part of electric grids. Due to abundance of solar irradiation and almost constant amount of it in certain geographical latitudes, selection of proper capacity of PV plants depends mostly on available places for the site. In this paper, important measures for safe connection of a PV plant in terms of voltage requirements are addressed and several guidelines are introduced for this purpose. In addition, simulation results are included to prove some of the mentioned suggestions. A general algorithm is finally proposed to show the directions for safe connection of PV plants

Analysis and Design of A Fully Soft Switched Two-Level DC-DC Boost Converter for Electric Vehicle Applications

In this paper, a fully soft switched two-level DC-DC Boost converter is proposed. The converter is used only one auxiliary cell to create the soft switching conditions for all semiconductor devices. The auxiliary cell contains one auxiliary switch, one resonant capacitor, one resonant inductor and one auxiliary diode. The auxiliary switch creates the soft switching conditions by control of resonant elements. Besides, the auxiliary cell is not located in the main power path and cannot decrease the converter efficiency. It has simple operation modes. Besides, the proposed soft-switched converter is highly efficient while the control circuit is simple and remains PWM. Furthermore, the use of two-level structure in the proposed topology creates a converter with high gain. Based on the mentioned advantages, the proposed converter is a suitable candidate to use in electric vehicles. The theoretical waveforms, operation modes and simulation results are considered to show the good characteristics of the proposed converter

A 5-bit time to digital converter using time to voltage conversion and integrating techniques for agricultural products analysis by Raman spectroscopy

Time to digital converter (TDC) is a key block for time-gated single photon avalanche diode (SPAD) arrays for Raman spectroscopy that applicable in the agricultural products and food analysis. In this paper a new dual slope time to digital converter that employs the time to voltage conversion and integrating techniques for digitizing the time interval input signals is presented. The reference clock frequency of the TDC is 100 MHz and the input range is theoretically unlimited. The proposed converter features high accuracy, very small average error and high linear range. Also this converter has some advantages such as low circuit complexity, low power consumption and low sensitive to the temperature, power supply and process changes (PVT) compared with the time to digital converters that used preceding conversion techniques. The proposed converter uses an indirect time to digital conversion method. Therefore, our converter has the appropriate linearity without extra elements. In order to evaluate the proposed idea, an integrating time to digital converter is designed in 0.18 μm CMOS technology and was simulated by Hspice. Comparison of the theoretical and simulation results confirms the proposed TDC operation; therefore, the proposed converter is very convenient for applications which have average speed and low variations in the signal amplitude such as biomedical signals

A Hybrid Switched-Inductor/Switched-Capacitor DC-DC Converter with High Voltage Gain Using a Single Switch for Photovoltaic Application

This paper introduces a new high-step-up, non-isolated switched-inductor switched-capacitor DC-DC converter. The proposed converter remarkably integrates switched-capacitor and switched-inductor cells, leading to a significant increase in voltage gain. This unique composite structure not only ensures the continuity of input current, but also successfully minimizes the current ripple and voltage stress across the components, thereby optimizing efficiency. The standout feature of this converter is its singular switch controlled by pulse-width modulation (PWM), which simplifies its operation. A rigorous steady-state operation analysis is conducted, providing a comprehensive understanding of the converter’s performance. For validating the theoretical findings, the paper also details a real-world prototype of the converter. Comparative studies conducted with other similar structures substantiate the superiority of the proposed converter.</p

High Step-Up Three-Level Soft Switching DC-DC Converter for Photovoltaic Generation Systems

In this paper, a high step-up three-level DC–DC converter with a symmetric structure for PV application is proposed. The converter has high voltage gain. This is achieved due to the use of two high step-up cells and two resonant paths in its structure. The converter has low input current ripples and the voltage stress across all switches is equal to half of the output voltage. The proposed converter uses simple pulse–width modulation (PWM) to trigger the switches. Hence, the proposed converter benefits from a simple structure and control circuit. All semiconductor devices are turned on/off under ZCS conditions. Thus, the switching losses are decreased, and the total efficiency is increased. The converter is implemented and tested through a laboratory prototype. The experimental results verify the theoretical analysis