272 Shivam Bharti, Amit Karmakar,Aparna Gautam International Journal of Electronics, Electrical and Computational System IJEECS ISSN 2348-117X Volume 6, Issue 9 September 2017 Hardware Development and Implementation of Single Phase Two Switch Cycloconverter Shivam Bharti 1 , Amit Karmakar 2 ,Aparna Gautam 3 1,3 Department of Electrical and Electronics Engineering 1,3 Birla Institute of Technology,Mesra, Ranchi,Jharkhand, INDIA C.V Raman college of engineering,Bhubaneshwar,Odisha, INDIA Abstract— This paper presents single phase cycloconverter using two switches which can be made to operate as voltage regulator, cycloconverter and rectifier. Simulation has been performed on MATLAB/Simulink software. The results of simulation has been presented and has been verified by the Experimental Hardware setup whose output results have been observed on DSO. arduino has been used here as the microcontroller the program code of which has been provided along. Optocoupler have been used for ZCD (zero crossing detector) to made the circuit work effectively. Keywords— cycloconverter, two switches, simulation, hardware setup, ZCD I. INTRODUCTION The AC-AC power converters in which ac power at one frequency is directly converter to ac power at another frequency without any intermediate dc conversion link are known as Cycloconverter [1]. If the output frequency is less than the supplied input frequency then it is said to be step down cycloconverter. Similarly if the output frequency is greater than supplied input frequency then it is step up cycloconverter. For step up cycloconverter, fo = fi× n (1) For step down cycloconverter, fo= fi × (1/n) (2) Here, ‘fo’is the output frequency, ‘fi’is the input frequency and ‘n’ is the constant. For step up cycloconverter the output frequency is equal to the ‘n’ multiples of input frequency and for step down cycloconverter the output frequency is equal to the ‘1/n’ multiples of input frequency [2].Thus the output voltage we will get will be as: Voutput= 2√2  ( 2  cos ) (3) Cycloconverter as frequency changers essentially find well established applications in (1)high- power low-speed reversible ac motor drives with constant-frequency input; and (2)constant- frequency power supplies with a variable- frequency input as in VSCF (variable-speed constant frequency) system, whereas they find potential applications in (3) controllable VAR (volt-amperes reactive ) generators for power factor correction; and (4) ac system interties linking two independent power systems [1]. It can be made to work as a fully controlled bridge rectifier, which uses two IGBT to control the average load voltage. IGBT1 and IGBT2 must be fired duringthe positive half-wave and negative half wave of the source voltage Vs respectively, to allow theconduction of current [1]. Voutput = 2  cos  (4) Important application areas of controlled rectifiers include uninterruptible power supplies (UPS), for feeding critical loads. A fully controlled or half- controlled rectifier is used to generate the dc voltage for the inverter. In addition, the input rectifier acts as a battery charger [1]. By delaying the firing pulse of IGBT1 and IGBT2 during the positive half-wave and negative half wave of the source voltage Vs respectively, we can make the circuit to work as AC voltage controller. AC voltage controllers are used either for control of therms value of voltage or current in lighting control, domestic and industrial heating, speed control of fan, pump or hoistdrives, soft starting of induction motors, etc. or as static acswitches (on/off control) in transformer tap changing, temperature control,speed stabilization of high inertia inductionmotor drives like centrifuge, capacitor switching in static reactivepower compensation, etc [1].