US4064454A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corona discharge detecting device
Assignee: Panasonic Holdings Corp
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Filing: 1976-01-14
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Granted: 1977-12-20
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Expires: 1996-01-14
Abstract
Abstract There is provided a device for detecting corona discharges generated in a high voltage generator which is operated by high frequency pulses, for example in a high voltage transformer which is used in the horizontal deflection circuit of a television receiver.
Inventors
- 👤 Hironori Yoshino
- 👤 Kohei Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:15
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/346; G01R15/00; G01R15/14; G01R15/18; G01R15/183; G01R15/185; H; H02; H02H; H02H1/00; H02H1/0007; H02H1/0015; H02H7/00; H02H7/04; H04; H04N; H04N17/00; H04N3/00; H04N3/10; H04N3/16; H04N3/18; H04N3/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
A corona discharge detecting device comprising: a horizontal deflection pulse generating circuit; a high voltage output circuit coupled to said pulse generating circuit for generating output pulses having frequency components in the same frequency range as said corona discharge; a flyback transformer including a primary coil coupled to said high voltage output circuit, a high voltage coil and a third coil; a tuned coupling circuit tuned to a frequency between 4.2 MHz and 50 MHz, said tuned coupling circuit including a magnetic core having an opening therein, a conductor connecting the high voltage and third coils of said flyback transformer passing through said opening, and a detecting coil wound on said core; a tuned amplifier coupled to the detecting coil of said flyback transformer, said tuned amplifier being tuned to the same frequency as said coupling circuit; and an oscilloscope having its input connected to the output of said tuned amplifier, corona pulses occurring in said flyback transformer being displayed on said oscilloscope as unsynchronized pulses.
Claim 2
Dependent Claim
166 words
A corona discharge detecting device comprising: a horizontal deflection pulse generating circuit; a high voltage output circuit coupled to said pulse generating circuit for generating output pulses having frequency components in the same frequency range as said corona discharge; a flyback transformer including a primary coil coupled to said high voltage output circuit, a high voltage coil and a third coil; a tuned coupling circuit tuned to a frequency between 4.2 MHz and 50 MHz, said tuned coupling circuit including a magnetic core having an opening therein, a conductor connecting the high voltage and third coils of said flyback transformer passing through said opening, and a detecting coil wound on said core; a tuned amplifier coupled to the detecting coil of said flyback transformer, said tuned amplifier being tuned to the same frequency as said coupling circuit; and an oscilloscope having its input connected to the output of said tuned amplifier, corona pulses occurring in said flyback transformer being displayed on said oscilloscope as unsynchronized pulses.
References Cited (Backward Citations)
US3015774A
Cited
US3727129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |