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Govel-Fitch generator

Published 17.01.2012 Presenter Anton Pankratov

Govel-Fitch generator

One of the original types of high voltage generators is Govel-Fitch generator developed in 1964. Structurally it consists of two main units:
- coiled transmission line (stripline) with additional layer of insulation between the turns
- and RC-chain with double-discharger.
Outer conductor in spiral is active and the inner – under insulation – is passive. The outer end of active conductor is connected to a switch (a rectangle with two semicircles in upper right corner). Remaining ends of both wires are open, in other words hanging in air.
High voltage output is in the middle of spiral. Generator supply voltage is fed to input. Before discharger stops feeding voltage to strip lines, the capacitor formed by them becomes charged. By turning the chopper, the capacitor begins to discharge through the discharger, resulting in charge’s moving down the active line, where it reflects from open circuit in inner end, and moves back to the discharger, changing polarity of active line relative to its initial charge.
Now all point charges move in the same direction, resulting in (in a very short period of time) 2-fold voltage increase between active and passive lines.
Voltage of each pair of active and passive lines in ideal situation (assuming ideal materials and design and, therefore, no losses) equals to double voltage of generator power supply. When N pairs of active/passive line, then ideal total output voltage is shown by equation: (2NV).
Such generator independently of Govel-Fitch was developed by Soviet scientists Belkin and Zharkova in 1961 and was used to power impulse gas lasers.