Exciter circuit with oscillatory discharge and solid state switchiing device
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United States of America Patent
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Jun 25, 1996
Grant Date -
N/A
app pub date -
May 12, 1994
filing date -
May 12, 1994
priority date (Note) -
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Abstract
An oscillatory discharge exciter includes an input connectable to a power supply; an output connectable to an igniter; at least two energy storage elements for producing an oscillatory discharge of energy during an exciter discharge period; a unidirectional gated switch and a rectifier coupled in reverse parallel with each other such that the switch and rectifier control, during respective alternating half cycles, oscillatory discharge energy at the exciter output; and a circuit for gating the switch in response to voltage transitions across the switch. The gating circuit can also be used as a snubber circuit to add gate drive to slow devices, as well as to trigger a series of switching devices with the application of only a single external trigger signal to one of the devices. In an alternative embodiment, the gating circuit is replaced with a circuit for maintaining holding current through the switch to prevent the switch from recovering to a blocking condition.
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