Mochammad Facta

Analysis and Implementation of Transformerless LCL Resonant Power Supply for Ozone Generation

This paper describes the analysis and design of an LCL resonant power supply for ozone generation. The main advantage of the proposed topology is the absence of high-voltage transformer; the high voltage gain is achievable by means of double-resonance phenomena. Furthermore, the bandwidth is wider than the ordinary LC and its phase difference is constant over specific frequency range; as a result, an open-loop operation can be implemented. The complete analysis and design procedure of the power supply is presented. The design procedure is verified by implementing the power supply to drive a dielectric barrier discharge prototype ozone chamber. The hardware results are found to be in close agreement with simulation and thus justify the validity of the design procedures. The proposed circuit is suitable for portable ozone power supply fed by low-voltage source such as battery or photovoltaic module.

A Simple and Effective Method to Estimate the Model Parameters of Dielectric Barrier Discharge Ozone Chamber

This paper presents a simple yet effective method to determine the electrical model parameters of the dielectric barrier discharge (DBD) ozone chamber at frequencies above 20 kHz. The method is an alternative to the conventional Lissajous plot estimation method which appears to yield unsatisfactory results in this frequency range. Furthermore, the proposed technique allows for the chamber parameters to be determined at different frequencies-a flexibility which is not easily achievable using the typical Lissajous method. The measurement setup consists of a full-bridge inverter and a high-frequency variable inductor connected to the DBD chamber. The inductor can be adjusted to allow for parameter determination at different frequencies. The chamber parameters obtained from experimental results are validated by applying them in a high-voltage power supply for ozone generator.

The development of ozone generation with low power consumption

This paper proposed the use of low power and low cost high frequency, high voltage resonant inverter as power supply to produce ozone gas at normal atmospheric pressure and ambient temperature. The modified class E resonant power converter is studied based on modified boost converter. The advantage of resonance phenomena used to convert the square waveform voltage input into sinusoidal output voltage in high voltage and high frequency. The model of the ozone chamber is developed using the RLC circuit. This basic RLC resonance tank circuit is used to determine the resonance frequency for inverter as a power supply to ozone chamber. It is also investigated the use of class E resonant when it is operated below resonant converter and act as pulse converter to supply the ozone chamber. As the result, the class E resonant converter has successfully produced maximum 2.8 kVpp, 8.66 kHz as resonant converter consumed of 8.74 Watt to produce 11,300 µg/m3 ozone. As the pulse power supply, the class E circuit produced 2.8 kVpp at 6.2 kHz, 18.3 watt to generate 5,900 µg/m3 Ozone. This low power converter and simple ozone chamber has a possibility to be developed as ozone generator system in compact form for residential application.

An Efficient Strategy to Generate High Resolution Three-Phase Pulse Width Modulation Signal Based on Field Programmable Gate Array

Pulse Width Modulation (PWM) is a common technique used in many different applications. This technique is the heart of the inverter system. This paper reported a modified strategy in asynchronous unipolar sinusoidal PWM (SPWM) switching scheme based on ACEX1K50TC144-3 Altera Field Programmable Gate Array (FPGA). The carrier frequency was designed for 20 kHz and the fundamental frequency was designed to adjust 1 to 100 Hz, with step increase in 1 Hz. A new SPWM signal generation strategy is proposed and compared to traditional SPWM generation technique. The design entry is conducted by Max+plus II version 10.2 through schematic and VHDL programming. The verification in level simulation and hardware realization has been done. As the result, the proposed modified SPWM signal generation strategy works properly and can reduces the usage of logic cell (LC) until 63.75%.

A New Type of Planar Chamber for High Frequency Ozone Generator System

This paper proposes a new type of planar chamber ozone generation operated at atmospheric pressure, ambient temperature and high frequency. The chamber was constructed in planar type with easy adjustment using simple filler material and arrangement for different type of electrodes. A prototype was developed based on study to find the most effective geometrical electrode shape and dielectric material to produce micro-discharges without additional discharge gas, low pressure and temperature.. The works were initially carried out by theoretical analysis and finite element simulations to find the best geometrical shape for the electrode and to prove theoretical prediction, the experimental works were set up to determine the preferable dielectric to be used along with the electrode. Finally, the best combination was revealed by using muscovite mica and aluminium mesh on copper plate to start generating ozone at 785 Volt and 30 kHz. This planar prototype chamber successfully delivered the highest ozone yield more than 3000 ppm and 120 g/kWh. Due to the simplicity and low cost design, this planar chamber can be suitably used for portable and home appliance.

Design and Development of a High-Voltage Transformer-less Power Supply for Ozone Generators Based on a Voltage-fed Full Bridge Resonant Inverter

It is known that transformer based power supplies for ozone generators have low efficiency, high cost and exhibits a limited frequency range of operation. To overcome these disadvantages, this paper proposes a high frequency ozone generator with the absence of a transformer. The voltage step-up is achieved only by utilizing the resonant tank. This is made possible by a novel combination of ozone chamber materials that allow ozone to be generated at only 1.5 3.5 kVp-p. The input to the resonant tank is driven by a PWM full bridge resonant inverter. Furthermore, zero-current zero-voltage switching (ZCZVS) operation is achieved by employing a duty factor of 25% between the switches of the full bridge. The advantages of the proposed system include high efficiency, low cost and the ability to control ozone production by varying the input voltage to the inverter. The prototype is verified by both simulation and experimental results.

Improvement in ozone generation with low voltage high frequency power converters

This paper proposes a low voltage, high frequency power converters to produce ozone gas in atmospheric pressure. The ozone chamber is made of a dielectric barrier discharge (DBD) chamber using perforated electrodes sheet and insulation material which has lower dielectric breakdown. The power converter is an isolated high frequency inverter with resonance at the secondary of the transformer. This converter is expected to generate ozone gas with lower voltage and power consumption.

Implementation of photovoltaic and simple resonant power converter for high frequency discharge application

Ozone gas (O3) is widely used in deodorization, decolourization, disinfection, bleaching processes, gas/air treatment, chemical synthesis and recently in medical applications. Due the wide application of ozone then the ozone generator or ozonizer is urgently needed. A single switch resonant converter with ferrite transformer is proposed in this work. The prototype is constructed by two parts, first is ozone chamber and the second part is power converter with a single switch resonant converter and it supplied by photovoltaic simulator. The converter is successful to convert 12 volt from photovoltaic to 1.89 kVpp high frequency voltage to ozone chamber. The ozone gas produce with the proposed system is 450 ppm with oxygen as an input gas.

The Application of Algorithm Genetic for Tuning Power System Stabilizer In Suralaya Power Plant Generation - West Java

In power system, the application of power system stabilizer (PSS) has been proved to overcome the stability of power system. But on the certain condition such as full load, it is necessary to determine the appropriate PSS parameter. This paper presents the application of algorithm genetic for tuning power system parameter stabilizer. The power plant system that is simulated in this paper is the model of Suralaya Power Generation in West Java - Indonesia. The effectiveness of this method is shown in eigen value analysis and the result of response system simulation.

Dielectric Barrier Discharge Ozonizer Using the Transformerless Single-Switch Resonant Converter for Portable Applications

This paper describes the analysis, design, and construction of an ozonizer based on a single-switch resonant converter (SSRC). The main contribution of the work is the removal of the transformer from the SSRC, resulting in much smaller footprint and higher efficiency. High voltage (up to 4.0 kVp-p) is achieved using a resonant tank, which comprises of an LC circuit combined with the chambers equivalent circuit components. Despite the absence of the transformer, the topology is able to generate sufficiently high voltage to initiate and sustain the formation of micro-discharges. Geometrically, the chamber is constructed as a planar type, using muscovite mica as dielectric. The main advantage of using mica is its availability in thin sheet (less than 1 mm), which then allows for the lowering of the initiation voltage. To validate the analysis and design, an experimental prototype of the ozonizer is build. It is found that the ozonizer draws very little power, i.e., less than 8 W with very high ozone yield (over 120 g/kWh at 1.0 L/min). The maximum measured efficiency is 75%. The proposed ozonizer is fed from a low voltage power source (up to 40 V dc) and hence its suitability for a wide range of portable applications.