Simple Resonant Power Converter Supplied by Photovoltaic for Ozonizer Mochammad. Facta; Hermawan Electrical Engineering Department, Universitas Diponegoro, Semarang – Indonesia facta@elektro.undip.ac.id Zainal Salam Universiti Teknologi Malaysia, Skudai Johor – Malaysia Abstract— 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 kV pp high frequency voltage to ozone chamber. The ozone gas produce with the proposed system is 450 ppm with oxygen as an input gas. Keywords— resonant converter, ozonizer; photovoltaic simulator. I. INTRODUCTION Conservative ozone generation with 50 or 60 Hz high voltage power supply, the voltage injected was about 3 – 10 kVrms or 8.5 – 28 kV peak to peak [1-3]. However, in practical the injected voltage used for ozone chamber at atmospheric pressure and ambient temperature is considerable high and near to the sparking potential. The dimension of conventional power supply is in a large volume, due to the present of transformer. Regard to safety, high voltage may not be suitable for household applications. Recently, ozone generation with 50 or 60 Hz high voltage power supply, the voltage injected was about 3 – 10 kVrms or 8.5 – 28 kV peak to peak [1, 4, 5]. This results give an increase in ozone production for a given surface area, while decreasing the require peak voltage. The the full bridge resonant converter operated at resonant frequency of 88 kHz was reported to generate ozone from from 4 – 6 kV peak to peak [6]. The converter requires four MOSFET switches and high DC input voltage (340 Volt). A single hard switching converter driving an ozone chamber filled with special discharge gas such as X e , A r , or N e operated at certain pressure. The dielectric layer was constructed in borosilicate glass or quartz with a conductive thin layer on the surface. Although the voltage reduce to 1 kVrms or 2.8 kV peak to peak and the ozone yield was high, such chamber is considered complicated to construct. [4, 7]. Planar electrodes are made from metal with borosilicate glass as dielectric. This ozone chamber need to be operated at higher voltage ( more than 7 kV) and frequencies from 5 - 7 kHz. [8-10]. Further more, the application of higher voltage result in filamentary effect inside the chamber [8, 11] and as a result a cooling system is necessary required. 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.. II. II. OZONIZER CHAMBER The proposed ozone chamber is designed with simplicity and practically in mind. It is to be operated at atmospheric pressure and ambient temperature condition without the need to use special gas. In addition it requires no or water cooling. The geometrical configuration is a simple rectangular shape with a planar dielectric barrier, and the chamber is constructed in 70 x 140 mm square as shown in Figure 10. The chamber is constructed by aluminium mesh as electrode and metal tape with muscovite mica sheet as dielectric material are placed between the electrodes. The air gap inside chamber is 1.5 mm. Maximum operating temperature is about 500 o C. A high voltage insulation tape is wrapped around the edges sides of electrode to prevent the spark or arch to occur [12]. Hole for Phase Terminal Hole for Neutral Terminal 120 mm Electrode Aluminium Mesh on Metal Tape 1.5 mm air gap Gas Outlet Gas Inlet 140mm Mica Sheet Electrode Metal Tape Figure 1. Ozone chamber The investigation to the characteristics of the chamber as it is supplied by high voltage high frequency gives Lissajeous pattern. This pattern is shown in Figure 2. Due to this electrical characteristics, the equivalence circuit of the ozone chamber is represented in parallel capacitance and reactance [13] as it is shown in Figure 3. Proceeding of International Conference on Electrical Engineering, Computer Science and Informatics (EECSI 2014), Yogyakarta, Indonesia, 20-21 August 2014 315