Remote control of cathode width voltage
US12382569B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2023 |
| Grant date | Aug 5, 2025 |
| Priority date | — |
| Expiry date | Jan 22, 2044 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05G1/56
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Methods and systems are provided for controlling an electron beam generated by an X-ray tube assembly including a unipolar cathode with a long cable between driving electronics of the cathode and the X-ray tube. A voltage supplied to a gridding electrode of 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 high precision voltage source of the second control circuit, and a gridding voltage for switching the cathode off is generated by voltage sources of the first control circuit. A time taken to transition between the gridding voltage and the bias voltage is advantageously reduced by decreasing the supplied voltage to a common voltage (e.g., 0 V) in a first step, and then increasing the supplied voltage to the bias voltage or the gridding voltage in a second step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.