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United States of America Patent
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Jan 19, 2016
Grant Date -
May 2, 2013
app pub date -
Jul 12, 2011
filing date -
Jul 13, 2010
priority date (Note) -
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Abstract
To the common point (C) of two transistors of a magnetron, switched converter power circuit is connected a coupling capacitor which provides input to a starter circuit. A transistor switch id in series with a capacitor and a diode. When the switch is off no current flows in (D11). When the switch is made, (D11) conducts during alternate halves of cycles present a (C). A second diode also conducts and allows current to pass through discharge capacitor. This progressively charges until the voltage across it reaches the breakdown voltage of a gas discharge tube (GTD). Whereupon the capacitor discharges through the primary winding of transformer (TR2). The second winding has many more turns and a started voltage is induced in the starter electrode. This is isolated from the Faraday cage and terminates adjacent to the crucible, close to the void.
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