STRATEGY FOR CONTROLLING CATHODE WIDTH VOLTAGE
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United States of America
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Apr 10, 2025
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Oct 10, 2023
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Oct 10, 2023
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Abstract
Methods and systems are provided for controlling an electron beam generated by an x-ray tube assembly including a unipolar cathode. In one embodiment, a voltage supplied to the cathode is controlled by a multi-stage switching unit including a first control circuit and a second control circuit. A bias voltage for switching the cathode on is generated by a voltage source of the second control circuit, and a gridding voltage for switching the cathode off is generated by a plurality of voltage sources of the first control circuit. When transitioning between the bias voltage and the gridding voltage and vice-versa, a control strategy is used where the voltage sources of the first control unit are selectively engaged and/or disengaged in a non-consecutive order in accordance with an optimized protocol, to prevent a voltage imbalance between capacitors of different stages of the multi-stage switching unit.
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