Fast-recovery circuitry and method for a capacitor charging power supply
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United States of America Patent
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Issued Date -
Apr 6, 2006
app pub date -
Sep 30, 2004
filing date -
Sep 30, 2004
priority date (Note) -
Abandoned
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Abstract
A power supply with a high voltage current regulated output wherein input devices are gated ON and OFF to regulate the output current. The output current is coupled through a current limiting inductor to a high voltage fast electronic switch (E-switch) that turns ON and OFF much faster than the power supply can shut down. The electronic switch is bypassed with a resistor network that is sized to dissipate slightly in excess of the full power rating of the power supply during a shut-down cycle. The electronic switch is normally gated ON providing a low impedance path for current charging the capacitor bank. When a short circuit condition is sensed, the E-switch is turned OFF and the resistor network limits the short circuit current, limits the voltage across the E-switch, and dissipates any energy stored in the inductor and the power supply circuitry during power supply shut-down.
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