A new electronic step-up/down voltage stabilizer topology based on H-Bridge AC chopper

Abstract

The rapid development and high controllability advantages of power electronic devices lead to their application in voltage stabilizers and tap-changers as competitive options with commercially available mechanical counterparts. This paper introduces a new electronic voltage stabilizer topology utilizes four AC switches in a form that may be named as "AC H-bridge" connection, and based on pulse width modulation (PWM) AC chopper combined with a single low power compensating transformer. Such topology eliminates the need of the main input multi-tapping transformer, hence reducing the overall size, weight and cost. Depending on the selected switches and value of the chopping duty cycle, the proposed configuration is capable of stepping up or down the input voltage, hence keeping the output voltage constant with continuous flow of input current and better harmonics restraining in the output load voltage. Mathematical equations describing the function of the proposed topology have been demonstrated and simulation analysis has been presented. Practical verification to confirm the capability of the setup has been illustrated through several experimental results and analysis.

IoT high-frequency electronic transformer with dimmable output voltage using PWM signals

“…Also, for such ends, the use of BLYNK has gained certain popularity for prototype making and IoT implementation, as shown in Sutanto, Putra, Kuncahyojat and Agustin (2020). This paper presents a low power, full-bridge, electronic transformer design, using MOSFET, similar to the works of Jirasereeamornkul et al (2003), but using a full-bridge inverter like Ashour (2008), controlled in such a way that the output can be varied; supported with simulations and prototype results. The electronic transformer operates at 120 Vrms input and converts to a variable output voltage between 10 Vrms and 20 Vrms, which can be changed through Wi-Fi, via an app.…”

“…The methodology used in this project consists of 4 stages, and is adapted from Ashour (2008), where the first stage is the electronic transformer design, composed of a cascade system and inverter circuit topology (Figure 1, red square). The second stage is the remote-control system, which allows to vary the PWM signals and controller the system remotely, (Figure 1, blue square).…”

Comparative Analysis of PWM AC Choppers with Different Loads with and Without Neural Network Application

“…This author presents another voltage stabilizer that uses an electronic item. This topology uses four Alternative Current switches in the frame called an "AC H-connect" association and dependent PWM Alternative Current choppers joined with a low-power compensating converter [3]. The investigation was conducted of the single-phase RL load created with the controller by the triac (triode) for the Alternative Current choppers [4].…”

A new switching strategy for transformer‐less back‐to‐back cascaded H‐bridge multilevel converter

“…A considerable number of redundant switching states can be used in modulation of a CHB converter. Three‐phase structure is simply derived from star or delta connection of three single‐phase CHB converters. In practice, back‐to‐back CHB structures are mostly used in medium‐voltage drives [10], electric frequency changers [11] and power electronic transformers [12–14]. These converters may be used in high‐voltage electronic tap changers [15] and high‐voltage cycloconverters [16] as well. The main challenges for these converters are related to the control system in the rectifier side, efficiency improvement and reduction of total size and weight.…”