Voltage generator

Patent metadata

Field	Value
Publication number	US-12317399-B2
Application number	US-202117918989-A
Country	US
Kind code	B2
Filing date	Jun 7, 2021
Priority date	Jun 10, 2020
Publication date	May 27, 2025
Grant date	May 27, 2025

Abstract

A voltage generator includes: a sealed case having a ground potential; a high-voltage transformer that is housed in the sealed case and boosts a voltage; a booster circuitry that is housed in the sealed case and boosts a voltage outputted from the high-voltage transformer; and a voltage detector that is housed in the sealed case and detects a voltage boosted by the booster circuitry. A first creepage path ranging from a high-voltage portion, which is a portion to which a highest voltage is applied in the voltage detector, to a ground point having an equal potential to the sealed case includes a first bent path, which is a bent path.

First claim

The invention claimed is:

1. A voltage generator comprising:
a case having a ground potential;
a high-voltage transformer housed in the case and adapted to boost a voltage;
a booster circuitry housed in the case and adapted to boost a voltage outputted from the high-voltage transformer; and
a voltage detector housed in the case and adapted to detect a voltage boosted by the booster circuitry, wherein
a first creepage path includes a first bent path that is a bent path, the first creepage path being a path from a first high-voltage portion that is a portion to which a highest voltage is applied in the voltage detector, to a ground point having an equal potential to the case.

2. The voltage generator according to claim 1 , wherein
the voltage detector includes a first rectangular area and a second rectangular area when viewed from a top surface side of the first creepage path,
the first high-voltage portion is disposed in the first rectangular area, and
the first creepage path is a path being bent at a boundary position between the first rectangular area and the second rectangular area and reaching the ground point through the second rectangular area.

3. The voltage generator according to claim 2 , wherein
the first creepage path is a path bent in an L shape at a boundary position between the first rectangular area and the second rectangular area when viewed from a top surface side of the first creepage path.

4. The voltage generator according to claim 1 , wherein
the voltage detector includes a first rectangular area, a second rectangular area, and a rectangular ring area when viewed from a top surface side of the first creepage path,
the first high-voltage portion is disposed in the first rectangular area, and
the first creepage path is a path:
passing from the first rectangular area to the second rectangular area;
being bent at a boundary position between the second rectangular area and the rectangular ring area;
being bent in the rectangular ring area; and
reaching the ground point.

5. The voltage generator according to claim 4 , wherein
the first creepage path is a path bent in an L shape at a boundary position between the first rectangular area and the second rectangular area when viewed from a top surface side of the first creepage path.

6. The voltage generator according to claim 1 , further comprising:
a baseplate having an insulation property and having a top surface parallel to a bottom surface of the voltage detector; and
a first spacer having an insulation property and disposed at a specific position between the baseplate and the voltage detector to cause the voltage detector and the baseplate to be disposed apart from each other by a specific interval, wherein
the first spacer extends from a top surface of the baseplate toward a bottom surface of the voltage detector, and
the first creepage path is a path passing from the first high-voltage portion to the first spacer, being bent at a boundary position between the first spacer and the baseplate, and reaching the ground point through the baseplate.

7. The voltage generator according to claim 6 , wherein
the baseplate includes a first rectangular area and a second rectangular area when viewed from a top surface side of the first creepage path, and
the first creepage path includes a second bent path being bent at a boundary position between the first rectangular area and the second rectangular area and reaching the ground point through the second rectangular area.

8. The voltage generator according to claim 7 , wherein
the first creepage path is a path bent in an L shape at a boundary position between the first rectangular area and the second rectangular area when viewed from a top surface side of the first creepage path.

9. The voltage generator according to claim 1 , wherein
second high-voltage portion that is a portion to which a highest voltage is applied in the booster circuitry, to the ground point.

10. The voltage generator according to claim 1 , wherein
an inside of the case is filled with an insulating layer having higher insulation performance than air.

11. The voltage generator according to claim 1 , wherein
the voltage detector includes:
a resistive voltage divider, including a plurality of voltage-dividing resistors connected in series, and adapted to divide and extract a voltage boosted by the booster circuitry;
a short-circuit current suppressive resistor connected to an output terminal of the booster circuitry, the resistive voltage divider, and a load side, wherein
the short-circuit current suppressive resistor is adapted to suppress a short-circuit current; and

a connection fitting connected to the short-circuit current suppressive resistor and the booster circuitry.

12. The voltage generator according to claim 11 , wherein
the voltage detector includes:
a second spacer disposed between the connection fitting and the booster circuitry and adapted to form a gap between the connection fitting and the booster circuitry.

13. The voltage generator according to claim 12 , wherein
the second spacer is disposed at a position not protruding from a bottom surface of the connection fitting when viewed from above the connection fitting.

14. The voltage generator according to claim 12 , wherein
the second spacer is formed by performing chamfering processing on a corner portion of a circular plate-shaped plate.

15. The voltage generator according to claim 12 , wherein
the second spacer is a conductor.

16. The voltage generator according to claim 15 , wherein
a contact angle between the second spacer and the voltage detector is 90 degrees.

17. The voltage generator according to claim 11 , wherein
at least one piece of the connection fitting is included in the first high-voltage portion.

Assignees

• Mitsubishi Electric Corp

Inventors

• Matsubara Noriyuki
• Izawa Fumihito
• Araki Yohei
• Yamashita Yuya
• Achihara Masato

Classifications

• H05G1/32

  Supply voltage of the X-ray apparatus or tube · CPC title

• H02M7/106 Primary

  With physical arrangement details · CPC title

• H05G1/10 Primary

  Power supply arrangements for feeding the X-ray tube {(supply circuits with converters in general H02M; supply circuits for emitters and amplifiers H04B1/16 - H04B1/1623)} · CPC title

• H01F38/26

  Constructions · CPC title