Spark sources with electronic switching tubes

Details Spark sources with electronic switching tubes Spark sources with electronic switching tubes

H - Electricity

05

B

317/5.95

H05B 31/02 (2006.01)

Patent

CA 1045675

ABSTRACT A spark source, comprising a spark gap having a grounded electrode and an ungrounded electrode, a capacitor adapted to be discharged across the spark gap, the capacitor having posi- tive and negative terminals adapted to be charged positively and negatively, a power supply for charging the capacitor, the power supply having positive and negative terminals connected to the positive and negative terminals of the capacitor, a dis- charge circuit connected between the capacitor and the spark gap, the discharge circuit including means for connecting the positive terminal of the capacitor to the grounded electrode of the spark gap, the discharge circuit including first and second inductive elements connected in series with the spark gap, and shunting diode means including a shunting diode and connected across the series combination of the spark gap and the second inductive element, the shunting diode being polarized the same as the polarization of the capacitor and thereby being forward biased and conductive during the first half cycle of the capacitor discharge current, whereby the shunting diode splits current away from the spark gap during the first half cycle. The second inductive element preferably has sufficient inductance to produce a uni-directional spark current after the first half cycle of the capacitor discharge current, the uni- directional spark current being polarized oppositely from the capacitor discharge current during the first half cycle. The shunting diode preferably has a sufficiently low impedance to prevent the breakdown of the spark gap during the first half cycle of the capacitor discharge current. The shunting diode means preferably includes a third inductive element in series with the shunting diode. - 1 -

297261

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