Ultra‐high step‐up DC–DC converters: UHS, Re‐UHS, and G‐UHS converters

Abstract

A new type of switching structure was constructed based on two capacitors, an inductor, a diode, and a switch. The switching structure was added into a high step-up (HS) converter, yielding an ultra-high step-up (UHS) direct current (DC)-DC converter. Two other converters, a repeated UHS converter and a generalized UHS converter, were derived from the basic UHS circuit. The converters depend mainly on charging and discharging of the inductors and capacitors to realize the step-up function. One of the UHS converter switches realizes zero-voltage turn-off, which greatly decreases the switching stress. This article analyzes the UHS converter, and the operation of the UHS converter in the continuous-conduction mode and discontinuous-conduction mode. The boundary condition, external characteristics, voltage gain, voltage stress, and inductor current of the UHS converter were analyzed, emphasizing the advantages of the UHS converter; namely, high voltage gain, low switching stress, and low inductance ripple. Parameter design criteria for electrical components are listed. The theoretical analysis was verified by computer simulations and construction of a working device.

Analysis, Design and Implementation of a Non‐isolated Switched Inductor/Capacitor Converter with Low Voltage Spikes

“…However, the voltage of the DC power supply is generally low. For example, the lead‐acid battery of a hybrid electric vehicle produces voltage of 12 V, but the lighting system of an automobile needs 85 V to work properly, so a high‐gain DC converter is required to boost the voltage [4]. The boosting principle of the DC converter is to use the energy storage characteristics of inductor or capacitor, by applying the Pulse Width Modulation (PWM) technique and changing switch frequency to achieve the purpose of increasing the output gain [5].…”