US4467224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for applying a high voltage source to a CRT through a capacitive load
Assignee: RCA Licensing Corp
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Filing: 1982-03-18
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Granted: 1984-08-21
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Expires: 2002-03-18
Abstract
Abstract A system for applying a high test voltage to a CRT through a high capacitance load includes two serially connected MOSFETs which have opposite polarities. A video input pulse triggers one MOSFET through an opto-isolation network. The video pulse is delayed and triggers the other MOSFET. The trigger pulses are the same polarity and only one of the MOSFETs can conduct at a given time. The capacitive load is coupled between the MOSFETs and received a high voltage short time pulse when one of the MOSFETs is conductive. The use of two MOSFETs permits the testing of both cathode driven and grid driven CRTs.
Inventors
- 👤 William J. Maddox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:25
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/78; H03K17/785; H03K5/00; H03K5/01; H03K5/02; H03K5/023
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
A system for applying a high voltage pulse to a CRT through a high capacitance load comprising p-type electron control means and n-type electron control means for alternatley coupling said load to said high voltage source when one type of said electron control means is conductive; means for receiving an input pulse and providing a control pulse; delay means responsive to said control pulse for providing a delayed control pulse; first means responsive to said delayed control pulse for rendering one type of said electron control means conductive when said input pulse is positive and non-conductive when said input pulse is negative; second means responsive to said control pulse for providing a stretched control pulse; and third means responsive to said stretched control pulse for rendering the other type of electron control means conductive when said one type is nonconductive and nonconductive when said one type is conductive.
Claim 2
Independent Claim
148 words
A system for applying a high voltage pulse to a CRT through a high capacitance load comprising p-type electron control means and n-type electron control means for alternatley coupling said load to said high voltage source when one type of said electron control means is conductive; means for receiving an input pulse and providing a control pulse; delay means responsive to said control pulse for providing a delayed control pulse; first means responsive to said delayed control pulse for rendering one type of said electron control means conductive when said input pulse is positive and non-conductive when said input pulse is negative; second means responsive to said control pulse for providing a stretched control pulse; and third means responsive to said stretched control pulse for rendering the other type of electron control means conductive when said one type is nonconductive and nonconductive when said one type is conductive.
Claim 3
Dependent Claim
15 words
The system of claim 1 is wherein said electron control means are solid state devices.
Claim 4
Dependent Claim
34 words
The system of claim 2 wherein said second means remains conductive after said control pulse terminates whereby the state of said other type of electron control means remains unchanged after said control pulse terminates.
Claim 5
Dependent Claim
35 words
The system of claim 3 wherein said second means includes at least two opto-isolators, one of said opto-isolators being responsive to said control pulse and another of said opto-isolators being responsive to said delay means.
Claim 6
Dependent Claim
16 words
The system of claim 4 wherein said means for receiving and said first means are inverters.
Claim 7
Dependent Claim
12 words
The system of claim 5 wherein said solid state devices are MOSFETs.
Claim 8
Independent Claim
22 words
The system of claims 2 or 5 wherein said solid state devices are MOSFETs and said load is coupled between said MOSFETs.
Claim 9
Dependent Claim
31 words
The system of claim 7 wherein said means for receiving includes an invert terminal and a non-invert input input terminal whereby said system has an invert mode and a non-invert mode.
Claim 10
Dependent Claim
33 words
The system of claim 2 or 5 wherein said means for receiving includes an invert input terminal and a non-invert input terminal whereby said system has an invert mode and a non-invert mode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-21 | 1988-02-20 | 1988-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-21 | 1992-02-20 | 1992-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-21 | 1996-02-20 | 1996-08-21 | $7700.00 | Window Closed / Lapsed |