US3663942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for transforming the voltage of a dc voltage source into a pulsating voltage
Assignee: Picker Andrex X Ray AS
•
Filing: 1970-10-30
•
Granted: 1972-05-16
•
Expires: 1990-10-30
Abstract
Abstract A circuit arrangement for supplying a load, e.g. an X-ray tube, with a pulsating voltage by means of a DC voltage source connected in series with the load and a controllable rectifier, which is extinguished by means of the charge on a commutating capacitor, which, via a current transformer, is charged by the leading edges of the load current, and the discharge of which is controlled, via a timing device, by the voltage across the commutating capacitor. Means may be provided for reducing the time constant of the timing device when the load current exceeds a given value.
Inventors
- 👤 Niels Jakobsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:19
CPC Classifications
H; H05; H05G; H05G1/00; H05G1/08; H05G1/10; H05G1/20; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/5152; H02M7/5155
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A circuit arrangement for transforming a DC voltage into a pulsating voltage including DC source, a load and controllable rectifier serially connected to said source, a first timing device for controlling the ignition times of said controllable rectifier, a series connected commutation capacitor and controllable switch coupled in parallel with said controllable rectifier, the improvement comprising: a current transformer and rectifier for charging said commutating capacitor from the load current; and second timing means, responsive to the potential across the commutating capacitor, for controlling the ignition times of said controllable switch, said second timing means including i. a time constant circuit including a time constant capacitor ii. a first breakdown element coupled to said time constant capacitor, said breakdown element providing a path for the discharge of said commutating capacitor when said time constant capacitor charges to a predetermined level, and iii. a second breakdown element coupled to said first breakdown element for causing said first breakdown element to be triggered when the potential across said commutating capacitor exceeds a predetermined amount, independent of the charge on said time constant capacitor.
Claim 2
Dependent Claim
181 words
A circuit arrangement for transforming a DC voltage into a pulsating voltage including DC source, a load and controllable rectifier serially connected to said source, a first timing device for controlling the ignition times of said controllable rectifier, a series connected commutation capacitor and controllable switch coupled in parallel with said controllable rectifier, the improvement comprising: a current transformer and rectifier for charging said commutating capacitor from the load current; and second timing means, responsive to the potential across the commutating capacitor, for controlling the ignition times of said controllable switch, said second timing means including i. a time constant circuit including a time constant capacitor ii. a first breakdown element coupled to said time constant capacitor, said breakdown element providing a path for the discharge of said commutating capacitor when said time constant capacitor charges to a predetermined level, and iii. a second breakdown element coupled to said first breakdown element for causing said first breakdown element to be triggered when the potential across said commutating capacitor exceeds a predetermined amount, independent of the charge on said time constant capacitor.
Claim 3
Dependent Claim
62 words
The circuit arrangement of claim 1 wherein said time constant circuit includes a serially connected resistance and capacitance circuit, said capacitance forming the time constant capacitor, coupled across the commutating capacitor, the potential across said time constant capacitor being applied to a control electrode of said first breakdown element, the output of said first breakdown element being coupled to said controllable switch.
Claim 4
Dependent Claim
35 words
The circuit arrangement of claim 2 wherein said second breakdown element is a zener diode, one terminal of which is coupled to said commutating capacitor, another terminal of which is coupled to said control electrode.
Claim 5
Dependent Claim
36 words
The circuit arrangement of claim 3 wherein said time constant circuit further includes a zener diode coupled in parallel with a series circuit formed of the time constant capacitor and a portion of said resistance means.
Claim 6
Dependent Claim
20 words
The circuit arrangement of claim 4 wherein said controllable switch is coupled to said first breakdown element through transformer means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |