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Published on Jul 2, 2011
Marx Generator Marx generator is a device that is used to generate high-voltage pulse. The operation of this device is based on the following principle: the capacitors connected in parallel are first charged with electric current, and then connected in series with the help of various switching devices. This results in the output voltage increasing in proportion to the number of connected capacitors. When the capacitors are charged the generator is launched after the first discharger goes off. Overvoltage at different dischargers forces all the chargers to be actuated almost simultaneously, which triggers the series connection of the charged capacitors. Marx generators can be used to produce pulses of tens of kilovolts to ten millions of volts. The generated pulse frequencies depend upon the generator's pulse capacity and constitutes anything from single pulses per hour to several tens of Hertz. Small laboratory Marx generators of up to 100-200 kilovolts can come with air insulation, whereas their more powerful counterparts are supplied with vacuum, gas or oil insulation, which helps prevent parasitic air breakthroughs and charge drain as a result of corona discharges. The main drawback of Marx generator is that at the charge volume of (50-100)x103 Volts it needs to contain 5-8 steps with the same number of spark switches, which is associated with the decrease of specific energy, mass and dynamic parameters and lower efficiency. In the discharge mode the total losses are represented by the losses in the capacitors and the spark gaps, and the load resistance. Marx's high-voltage pulse generator is used in various scientific studies and in performing all kinds of technical tasks. In some units the generators operate instead of the surge current generators. In science Marx generators come in handy in nuclear and thermonuclear studies for speeding up various atomic particles, they are used as a powerful pumping source for optical amplifiers, applied for the studies of plasma states and pulse electromagnetic radiation. In the military industry this device is viewed as an electromagnetic weapon. In general industrial equipment Marx generators are together with the other pulse voltage and current sources used in electrohydraulic metal processing, crushing, drilling, soil and concrete consolidation.