International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2013): 6.14 | Impact Factor (2015): 6.391 Volume 5 Issue 10, October 2016 www.ijsr.net Licensed Under Creative Commons Attribution CC BY Design of Solid State Tesla Coil Using 555 Timer and IRFP460N MOSFET Soumyadeep Sarkar Department of Electrical and Electronic Engineering (EEE), Kurukshetra University, Kurukshetra Abstract: The Solid State Tesla Coil is a device which is capable of producing extremely high voltage, high frequency and low amperage alternating current electricity. The original device i.e. the Spark Gap Tesla Coil was designed by Nikola Tesla around 1891. This device has similarities to that of a traditional Spark Gap Tesla Coil but has a different circuitry for operation. This paper documents the design, operation and construction of such a system. Keywords: Tesla Coil; Solid State Tesla Coil; Magnifying Transmitter; 555 Timer IC; MOSFET; High Voltage; High Frequency; Corona Discharge. 1. Introduction A Tesla coil is an electrical resonant transformer circuit used to produce high-voltage, low-current, and high frequency alternating current electricity. Nikola Tesla experimented with a number of different configurations of resonant electric circuits. Tesla used these coils to conduct experiments related to electrical lighting, phosphorescence, X-ray generation, high frequency alternating current phenomena, electrotherapy, the transmission of electrical energy without wires, etc. Tesla coil circuits were commercially used in spark-gap radio transmitters for wireless telegraphy until the 1920s, and in medical equipment such as electrotherapy and violet ray devices. Today their main use is for entertainment and educational displays, though small coils are still used today as leak detectors for high vacuum systems. The Tesla coil was invented around 1891. The original intention for its invention was to create a wireless electrical energy distribution system. Unfortunately, the design could not send power at even close to reasonable efficiency, as almost all the useful power was being wasted on corona and arcing. But what makes the Tesla coil truly magnificent is the voltage it produces. A typical spark gap type coil takes (usually) the voltage from a common wall socket, and steps it up to a couple thousand volts, where it then goes through the switching circuit, through the primary, and is seen on the secondary side as more than 200,000 volts. This type of Tesla Coil requires a high voltage supply. A Solid State Tesla Coil does not require this, as it works with mains voltage. The Solid State Tesla Coil is one of the types of Tesla coils available. It has several advantages over the more common spark-gap Tesla coil. They are less noisy than conventional Tesla coils, yet they can still achieve a respectable output. They can also be made to play music through its spark, which is Audio Modulated. They are also friendlier to nearby electronic apparatus, though one should still be cautious. Its main component, the 555 timer IC is connected to the circuit and the supplied power is 12 Volts, 500 mili-amperes, the MOSFET used is the IRFP460N. The MOSFET (with a 680 picofarad, 2 Kilo-volt capacitor) is connected to one end of the primary coil and the other is connected to one end of the 110 Volts AC line with a 6 Ampere diode in series. The MOSFET is protected using several diodes on the Gate, Drain and Source pins. The capacitor which is used in parallel with the AC line is a Mylar capacitor; FKPs and MKPs can also be used. Such capacitors are used because first, the ordinary capacitors may not work and second, due to the load of the device. The Secondary coil is made using pure copper wire of 36 American Wire Gauge with additional spray varnishing insulation coating to prevent leakage. One end of the Secondary coil is grounded and the other is connected to a toroid for top load capacitance, the expression of which is given by: (1) where, C= Top-load Capacitance. D1= Diameter of the Toroid Ring. D2= Diametric Thickness of the Ring. Its Spark Length can be calculated by: (2) where, P= Power. L= Spark Length. And for matching the Inductance to the capacitance for proper resonance frequency, the expression is given by: (3) where, F= Resonant Frequency (KHz) L= Inductance. (mH) C= Capacitance (microfarads) The coil is tuned to the best of my knowledge and the best configuration which is used is: A. For Primary Coil:- 2mm insulated wire with 1 mm insulation and 1 mm wire wound on a PVC pipe of 9 cm diameter with 15 turns. Paper ID: ART20162613 1853 DOI: 10.21275/ART20162613