Continuous high d.c. voltage supply particularly for an X-ray emitter tube

• US 4,680,693 A
• Filed: 02/10/1986
• Issued: 07/14/1987
• Est. Priority Date: 02/12/1985
• Status: Expired due to Fees

• Current Assignee: Thomson-Cgr
• Original Assignee: Thomson-Cgr
• Inventors: Carron, Claude
• Primary Examiner(s): Wong, Peter S.
• Application Number:
  US06/827,725
• Time in Patent Office: 519 Days
• Field of Search: 363/17, 363/98, 363/132, 378/101, 378/104, 378/105, 378/111, 378/112
• US Class Current: 363/98
• CPC Class Codes: H02M 3/3376 with automatic control of output voltage or current
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: H02M 7/53873 with digital control
• CPC Class Codes: H05G 1/20 with high-frequency ac; with pulse trains pulse generators in general H03K3/00, H03K4/00
• CPC Class Codes: H05G 1/32 Supply voltage of the X-ray apparatus or tube

Abstract

A d.c. voltage is produced from a single-phase electric mains for supplying an X-ray tube. This supply is pulsed under the control of a synchronizing circuit with which it is further possible to adjust the duration of the operating pulses, as well as their phase blocking with respect to the mains. By acting in this way excessive current is not taken during the voltage troughs between two successive half-waves. The losses by the Joule effect in the mains are reduced and the quality of the pulsed high voltage is improved because of the increased stability. There is only a slight increase in the exposure time.

Claims

1. A high voltage d.c. supply which receives alternating electrical energy from a general single-phase distribution mains, comprising:

means for periodically tapping said energy from said mains during periods having a duration less than a half-wave of the alternating electrical energy to thereby produce periodically chopped high d.c. voltage synchronized with said alternating electrical energy;

means for regulating said chopped high voltage wherein said regulating means includes a frequency modulator for modulating an oscillating frequency of a ripple generator and wherein said means for periodically tapping said energy includes a means for validating that said regulating means is operating.

2. A supply according to claim 1, comprising:

first rectifying means connected to said mains, wherein said ripple generator is connected to the first rectifying means, and wherein said ripple generator produces a rippled voltage;

means for raising the voltage produced by said ripple generator and a second rectifying and filtering means connected to said raising means, wherein said periodic tapping means includes means for synchronizing said ripple generator with said mains.

3. A supply according to claim 2, wherein said first and second rectifying means are a double half-wave rectifier.

4. A supply according to one of claims 2 or 3, wherein the synchronizing means includes means for varying said means for synchronizing depending upon the phase of said mains.

5. A supply according to any one of the claims 2 or 3, wherein said synchronization means includes means for increasing or decreasing the times during which said tapping is performed.