High voltage pulse generator
First Claim
1. A high voltage pulse generator comprising:
- a power supply having an ac output;
an even number of capacitor charging circuits, each of the even number of capacitor charging circuits comprising an LC inversion Marx generator having two or more capacitors and a switch to control charging and discharging of the capacitors; and
a plurality of cell inverter transformers, each of the plurality of cell inverter transformers comprising a primary winding and a secondary winding to supply ac power to each of the even number of capacitor charging circuits, each of the plurality of cell inverter transformers having its primary winding connected across the ac output of the power supply, each of the plurality of cell inverter transformers having its secondary winding connected exclusively to at least one of the two or more capacitors in one of the even number of capacitor charging circuits by a means for converting the ac power to dc power, each of the plurality of cell inverter transformers and associated means for converting the ac power to dc power comprising a circuit to supply the ac output of the power supply to the two or more capacitors in half of the even number of capacitor charging circuits with inverted phase from the ac output of the power supply to the two or more capacitors in the remaining half of the even number of capacitor charging circuits.
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Accused Products
Abstract
A high voltage pulse generator utilizes an even number of Marx cells using L-C inversion topology. Each Marx cell is associated with an individual inverter transformer having a primary winding connected to the output of an ac power supply such as a series resonant inverter. The secondary of each inverter transformer is half-wave rectified to charge the energy storage capacitors in each Marx cell. A distributed voltage sensing scheme can be provided for accurate feedback to the inverter'"'"'s controller. An inductive element can be used to achieve a magnetic diode effect in the L-C inversion circuit to reduce component stress and improve efficiency. A transformer-coupled floating gate drive circuit is used to provide local power conditioning and trigger timing for discharge of the energy storage capacitors.
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Citations
22 Claims
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1. A high voltage pulse generator comprising:
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a power supply having an ac output; an even number of capacitor charging circuits, each of the even number of capacitor charging circuits comprising an LC inversion Marx generator having two or more capacitors and a switch to control charging and discharging of the capacitors; and a plurality of cell inverter transformers, each of the plurality of cell inverter transformers comprising a primary winding and a secondary winding to supply ac power to each of the even number of capacitor charging circuits, each of the plurality of cell inverter transformers having its primary winding connected across the ac output of the power supply, each of the plurality of cell inverter transformers having its secondary winding connected exclusively to at least one of the two or more capacitors in one of the even number of capacitor charging circuits by a means for converting the ac power to dc power, each of the plurality of cell inverter transformers and associated means for converting the ac power to dc power comprising a circuit to supply the ac output of the power supply to the two or more capacitors in half of the even number of capacitor charging circuits with inverted phase from the ac output of the power supply to the two or more capacitors in the remaining half of the even number of capacitor charging circuits. - View Dependent Claims (2, 3)
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4. A high voltage pulse generator comprising:
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a power supply having an ac output; an even number of capacitor charging circuits, each of the even number of capacitor charging circuits comprising an LC inversion Marx generator having two or more capacitors and a switch to control charging and discharging of the capacitors; a plurality of cell inverter transformers, each of the plurality of cell inverter transformers comprising a primary winding and a secondary winding to supply ac power to each of the even number of capacitor charging circuits, each of the plurality of cell inverter transformers having its primary winding connected across the ac output of the power supply, each of the plurality of cell inverter transformers having its secondary winding connected exclusively to at least one of the two or more capacitors in one of the even number of capacitor charging circuits by a means for converting the ac power to dc power, each of the plurality of cell inverter transformers and associated means for converting the ac power to dc power comprising a circuit to supply the ac output of the power supply to the two or more capacitors in half of the even number of capacitor charging circuits with inverted phase from the ac output of the power supply to the two or more capacitors in the remaining half of the even number of capacitor charging circuits; a pulse generating circuit for generating a train of periodic normal pulses except when a trigger event causes the pulse generating circuit to generate a trigger pulse; and a pulse processing circuit having a pulse processing circuit input for receiving the periodic normal pulses and trigger pulses from the pulse generating circuit, the pulse processing circuit generating a close switch output to close the switch in each of the LC inversion Marx generators when a trigger pulse is received. - View Dependent Claims (5, 6, 7, 8)
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9. A high voltage pulse generator comprising:
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a power supply having an ac output; an even number of capacitor charging circuits, each of the even number of capacitor charging circuits comprising an LC inversion Marx generator having two or more capacitors and a switch to control charging and discharging of the two or more capacitors, the two or more capacitors in all capacitor charging circuits connected in series to form a stacked charging circuit; a plurality of cell inverter transformers, each of the plurality of cell inverter transformers comprising a primary winding and a secondary winding to supply ac power to each of the even number of capacitor charging circuits, each of the plurality of cell inverter transformers having its primary winding connected across the ac output of the power supply, each of the plurality of cell inverter transformers having its secondary winding connected exclusively to at least one of the two or more capacitors in one of the even number of capacitor charging circuits by a means for converting the ac power to dc power, each of the plurality of cell inverter transformers and associated means for converting the ac power to dc power comprising a circuit to supply the ac output of the power supply to the two or more capacitors in half of the even number of capacitor charging circuits with inverted phase from the ac output of the power supply to the two or more capacitors in the remaining half of the even number of capacitor charging circuits; a pulse generating circuit for generating a train of periodic normal pulses except when a trigger event causes the pulse generating circuit to generate a trigger pulse; a pulse processing circuit having a pulse processing circuit input for receiving the periodic normal pulses and trigger pulses from the pulse generating circuit, the pulse processing circuit generating a close switch output to close the switch in each of the LC inversion Marx generators when a trigger pulse is received; and a power modulator having an output connected to a pulsed load, the stacked charging circuit connected directly to the power modulator to provide a high voltage pulse to the pulsed load. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of generating a high voltage pulse comprising the steps of:
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connecting the primary winding of each of a plurality of cell inverter transformers to the ac output of a power supply; connecting the seconding winding of each of the plurality of cell inverter transformers to a rectifier means to convert the ac output of the power supply into dc power; and connecting each of the rectifier means to at least one of the capacitors in each of an even number of LC inversion Marx generators to provide a means for charging the capacitors, each of the even number of LC inversion Marx generators having a switch to control charging and discharging of the capacitors, half of the plurality of cell inverter transformers having their primary windings arranged in inverted phase to the ac output of the power supply from the remaining plurality of cell inverter transformers to charge the capacitors in half of the even number of LC inversion Marx generators in each half cycle of the ac output of the power supply. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification